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<li class="chapter " data-level="1.1" data-path="../../">
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Introduction
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What's New in 2.0
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FAQ
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nats.io
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What is NATS
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Subject-Based Messaging
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Publish-Subscribe
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<a href="../concepts/reqreply.html">
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Request-Reply
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<a href="../concepts/queue.html">
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Queue Groups
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Acknowledgements
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<a href="../concepts/seq_num.html">
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Sequence Numbers
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<li class="header">Developing With NATS</li>
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Introduction
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Connecting
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Connecting to the Default Server
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</a>
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Connecting to a Specific Server
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</a>
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<li class="chapter " data-level="3.2.3" data-path="../connecting/cluster.html">
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<a href="../connecting/cluster.html">
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Connecting to a Cluster
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</a>
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<a href="../connecting/connect_timeout.html">
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Setting a Connect Timeout
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</a>
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<li class="chapter " data-level="3.2.5" data-path="../connecting/pingpong.html">
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Ping/Pong Protocol
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</a>
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<li class="chapter " data-level="3.2.6" data-path="../connecting/protocol.html">
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<a href="../connecting/protocol.html">
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Controlling the Client/Server Protocol
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</a>
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</li>
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<li class="chapter " data-level="3.2.7" data-path="../connecting/noecho.html">
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<a href="../connecting/noecho.html">
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Turning Off Echo'd Messages
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.3" data-path="../reconnect/intro.html">
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<a href="../reconnect/intro.html">
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Automatic Reconnections
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</a>
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<ul class="articles">
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<a href="../reconnect/disable.html">
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Disabling Reconnect
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</a>
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<li class="chapter " data-level="3.3.2" data-path="../reconnect/max.html">
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<a href="../reconnect/max.html">
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Set the Number of Reconnect Attempts
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</a>
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</li>
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<li class="chapter " data-level="3.3.3" data-path="../reconnect/wait.html">
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<a href="../reconnect/wait.html">
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Pausing Between Reconnect Attempts
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</a>
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</li>
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<li class="chapter " data-level="3.3.4" data-path="../reconnect/random.html">
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<a href="../reconnect/random.html">
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Avoiding the Thundering Herd
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</a>
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</li>
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<li class="chapter " data-level="3.3.5" data-path="../reconnect/events.html">
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<a href="../reconnect/events.html">
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Listening for Reconnect Events
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</a>
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</li>
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<li class="chapter " data-level="3.3.6" data-path="../reconnect/buffer.html">
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<a href="../reconnect/buffer.html">
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Buffering Messages During Reconnect Attempts
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.4" data-path="../security/intro.html">
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<a href="../security/intro.html">
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Securing Connections
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.4.1" data-path="../security/userpass.html">
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<a href="../security/userpass.html">
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Authenticating with a User and Password
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</a>
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</li>
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<li class="chapter " data-level="3.4.2" data-path="../security/token.html">
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<a href="../security/token.html">
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Authenticating with a Token
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</a>
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</li>
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<li class="chapter " data-level="3.4.3" data-path="../security/nkey.html">
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<a href="../security/nkey.html">
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Authenticating with an NKey
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</a>
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</li>
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<li class="chapter " data-level="3.4.4" data-path="../security/creds.html">
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<a href="../security/creds.html">
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Authenticating with a Credentials File
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</a>
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</li>
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<li class="chapter " data-level="3.4.5" data-path="../security/tls.html">
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<a href="../security/tls.html">
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Encrypting Connections with TLS
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.5" data-path="../receiving/intro.html">
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<a href="../receiving/intro.html">
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Receiving Messages
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.5.1" data-path="../receiving/sync.html">
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<a href="../receiving/sync.html">
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Synchronous Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.2" data-path="../receiving/async.html">
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<a href="../receiving/async.html">
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Asynchronous Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.3" data-path="../receiving/unsubscribing.html">
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<a href="../receiving/unsubscribing.html">
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Unsubscribing
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</a>
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</li>
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<li class="chapter " data-level="3.5.4" data-path="../receiving/unsub_after.html">
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<a href="../receiving/unsub_after.html">
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Unsubscribing After N Messages
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</a>
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</li>
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<li class="chapter " data-level="3.5.5" data-path="../receiving/reply.html">
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<a href="../receiving/reply.html">
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Replying to a Message
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</a>
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</li>
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<li class="chapter " data-level="3.5.6" data-path="../receiving/wildcards.html">
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<a href="../receiving/wildcards.html">
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Wildcard Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.7" data-path="../receiving/queues.html">
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<a href="../receiving/queues.html">
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Queue Subscriptions
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</a>
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</li>
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<li class="chapter " data-level="3.5.8" data-path="../receiving/drain.html">
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<a href="../receiving/drain.html">
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Draining Messages Before Disconnect
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</a>
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</li>
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<li class="chapter " data-level="3.5.9" data-path="../receiving/structure.html">
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<a href="../receiving/structure.html">
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Structured Data
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.6" data-path="intro.html">
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<a href="intro.html">
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Sending Messages
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.6.1" data-path="replyto.html">
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<a href="replyto.html">
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Including a Reply Subject
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</a>
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</li>
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<li class="chapter active" data-level="3.6.2" data-path="request_reply.html">
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<a href="request_reply.html">
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Request-Reply Semantics
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</a>
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</li>
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<li class="chapter " data-level="3.6.3" data-path="caches.html">
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<a href="caches.html">
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Caches, Flush and Ping
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</a>
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</li>
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<li class="chapter " data-level="3.6.4" data-path="structure.html">
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<a href="structure.html">
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Sending Structured Data
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.7" data-path="../events/intro.html">
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<a href="../events/intro.html">
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Monitoring the Connection
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.7.1" data-path="../events/events.html">
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<a href="../events/events.html">
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Listen for Connection Events
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</a>
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</li>
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<li class="chapter " data-level="3.7.2" data-path="../events/slow.html">
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<a href="../events/slow.html">
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Slow Consumers
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="3.8" data-path="../tutorials/intro.html">
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<a href="../tutorials/intro.html">
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Tutorials
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</a>
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<ul class="articles">
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<li class="chapter " data-level="3.8.1" data-path="../tutorials/pubsub.html">
|
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<a href="../tutorials/pubsub.html">
|
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|
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|
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Explore NATS Pub/Sub
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</a>
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</li>
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<li class="chapter " data-level="3.8.2" data-path="../tutorials/reqreply.html">
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<a href="../tutorials/reqreply.html">
|
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|
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Explore NATS Request/Reply
|
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</a>
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</li>
|
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|
|
<li class="chapter " data-level="3.8.3" data-path="../tutorials/queues.html">
|
|
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<a href="../tutorials/queues.html">
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|
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|
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Explore NATS Queueing
|
|
|
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</a>
|
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</li>
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|
|
<li class="chapter " data-level="3.8.4" data-path="../tutorials/custom_dialer.html">
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|
|
|
<a href="../tutorials/custom_dialer.html">
|
|
|
|
|
|
Advanced Connect and Custom Dialer in Go
|
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|
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</a>
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</li>
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</ul>
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</li>
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|
<li class="header">NATS Server</li>
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|
|
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<li class="chapter " data-level="4.1" data-path="../../nats_server/installation.html">
|
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|
<a href="../../nats_server/installation.html">
|
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|
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|
Installing
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</a>
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</li>
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|
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<li class="chapter " data-level="4.2" data-path="../../nats_server/running.html">
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<a href="../../nats_server/running.html">
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Running
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</a>
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<ul class="articles">
|
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|
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<li class="chapter " data-level="4.2.1" data-path="../../nats_server/windows_srv.html">
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|
|
|
<a href="../../nats_server/windows_srv.html">
|
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|
|
|
|
Window Service
|
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|
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</a>
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</li>
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</ul>
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</li>
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|
|
<li class="chapter " data-level="4.3" data-path="../../nats_server/clients.html">
|
|
|
|
<a href="../../nats_server/clients.html">
|
|
|
|
|
|
Clients
|
|
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</a>
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</li>
|
|
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|
<li class="chapter " data-level="4.4" data-path="../../nats_server/flags.html">
|
|
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|
<a href="../../nats_server/flags.html">
|
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|
|
|
|
Flags
|
|
|
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</a>
|
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|
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="4.5" data-path="../../nats_server/configuration.html">
|
|
|
|
<a href="../../nats_server/configuration.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
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|
|
|
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|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.1" data-path="../../nats_server/securing_nats.html">
|
|
|
|
<a href="../../nats_server/securing_nats.html">
|
|
|
|
|
|
Securing NATS
|
|
|
|
</a>
|
|
|
|
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|
|
<ul class="articles">
|
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|
|
<li class="chapter " data-level="4.5.1.1" data-path="../../nats_server/tls.html">
|
|
|
|
<a href="../../nats_server/tls.html">
|
|
|
|
|
|
Enabling TLS
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2" data-path="../../nats_server/auth_intro.html">
|
|
|
|
<a href="../../nats_server/auth_intro.html">
|
|
|
|
|
|
Authentication
|
|
|
|
</a>
|
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|
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|
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<ul class="articles">
|
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|
|
<li class="chapter " data-level="4.5.1.2.1" data-path="../../nats_server/tokens.html">
|
|
|
|
<a href="../../nats_server/tokens.html">
|
|
|
|
|
|
Tokens
|
|
|
|
</a>
|
|
|
|
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.2" data-path="../../nats_server/username_password.html">
|
|
|
|
<a href="../../nats_server/username_password.html">
|
|
|
|
|
|
Username/Password
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.3" data-path="../../nats_server/tls_mutual_auth.html">
|
|
|
|
<a href="../../nats_server/tls_mutual_auth.html">
|
|
|
|
|
|
TLS Authentication
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.4" data-path="../../nats_server/nkey_auth.html">
|
|
|
|
<a href="../../nats_server/nkey_auth.html">
|
|
|
|
|
|
NKeys
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.5" data-path="../../nats_server/accounts.html">
|
|
|
|
<a href="../../nats_server/accounts.html">
|
|
|
|
|
|
Accounts
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.6" data-path="../../nats_server/jwt_auth.html">
|
|
|
|
<a href="../../nats_server/jwt_auth.html">
|
|
|
|
|
|
JWTs
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.2.7" data-path="../../nats_server/auth_timeout.html">
|
|
|
|
<a href="../../nats_server/auth_timeout.html">
|
|
|
|
|
|
Authentication Timeout
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.1.3" data-path="../../nats_server/authorization.html">
|
|
|
|
<a href="../../nats_server/authorization.html">
|
|
|
|
|
|
Authorization
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.2" data-path="../../nats_server/clustering.html">
|
|
|
|
<a href="../../nats_server/clustering.html">
|
|
|
|
|
|
Clustering
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.2.1" data-path="../../nats_server/cluster_config.html">
|
|
|
|
<a href="../../nats_server/cluster_config.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.2.2" data-path="../../nats_server/cluster_tls.html">
|
|
|
|
<a href="../../nats_server/cluster_tls.html">
|
|
|
|
|
|
TLS Authentication
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.3" data-path="../../gateways/">
|
|
|
|
<a href="../../gateways/">
|
|
|
|
|
|
Gateways
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.3.1" data-path="../../gateways/gateway.html">
|
|
|
|
<a href="../../gateways/gateway.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.4" data-path="../../leafnodes/">
|
|
|
|
<a href="../../leafnodes/">
|
|
|
|
|
|
Leaf Nodes
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.5.4.1" data-path="../../leafnodes/leafnode_conf.html">
|
|
|
|
<a href="../../leafnodes/leafnode_conf.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.5" data-path="../../nats_server/logging.html">
|
|
|
|
<a href="../../nats_server/logging.html">
|
|
|
|
|
|
Logging
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.5.6" data-path="../../nats_server/monitoring.html">
|
|
|
|
<a href="../../nats_server/monitoring.html">
|
|
|
|
|
|
Monitoring
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6" data-path="../../nats_admin/">
|
|
|
|
<a href="../../nats_admin/">
|
|
|
|
|
|
Managing A NATS Server
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.6.1" data-path="../../nats_admin/upgrading_cluster.html">
|
|
|
|
<a href="../../nats_admin/upgrading_cluster.html">
|
|
|
|
|
|
Upgrading a Cluster
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.2" data-path="../../nats_admin/slow_consumers.html">
|
|
|
|
<a href="../../nats_admin/slow_consumers.html">
|
|
|
|
|
|
Slow Consumers
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.3" data-path="../../nats_admin/signals.html">
|
|
|
|
<a href="../../nats_admin/signals.html">
|
|
|
|
|
|
Signals
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.6.4" data-path="../../sys_accounts/">
|
|
|
|
<a href="../../sys_accounts/">
|
|
|
|
|
|
System Accounts
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.6.4.1" data-path="../../sys_accounts/sys_accounts.html">
|
|
|
|
<a href="../../sys_accounts/sys_accounts.html">
|
|
|
|
|
|
Configuration
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.7" data-path="../../nats_docker/">
|
|
|
|
<a href="../../nats_docker/">
|
|
|
|
|
|
NATS and Docker
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="4.7.1" data-path="../../nats_docker/nats-docker-tutorial.html">
|
|
|
|
<a href="../../nats_docker/nats-docker-tutorial.html">
|
|
|
|
|
|
Tutorial
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="4.7.2" data-path="../../nats_docker/docker_swarm.html">
|
|
|
|
<a href="../../nats_docker/docker_swarm.html">
|
|
|
|
|
|
Docker Swarm
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
|
|
|
|
|
|
<li class="header">NATS Tools</li>
|
|
|
|
|
|
|
|
<li class="chapter " data-level="5.1" data-path="../../nats_tools/mkpasswd.html">
|
|
|
|
<a href="../../nats_tools/mkpasswd.html">
|
|
|
|
|
|
mkpasswd
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.2" data-path="../../nats_tools/nk.html">
|
|
|
|
<a href="../../nats_tools/nk.html">
|
|
|
|
|
|
nk
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3" data-path="../../nats_tools/nsc/">
|
|
|
|
<a href="../../nats_tools/nsc/">
|
|
|
|
|
|
nsc
|
|
|
|
</a>
|
|
|
|
|
|
|
|
<ul class="articles">
|
|
|
|
|
|
<li class="chapter " data-level="5.3.1" data-path="../../nats_tools/nsc/nsc.html">
|
|
|
|
<a href="../../nats_tools/nsc/nsc.html">
|
|
|
|
|
|
Basics
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.2" data-path="../../nats_tools/nsc/streams.html">
|
|
|
|
<a href="../../nats_tools/nsc/streams.html">
|
|
|
|
|
|
Streams
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.3" data-path="../../nats_tools/nsc/services.html">
|
|
|
|
<a href="../../nats_tools/nsc/services.html">
|
|
|
|
|
|
Services
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.4" data-path="../../nats_tools/nsc/signing_keys.html">
|
|
|
|
<a href="../../nats_tools/nsc/signing_keys.html">
|
|
|
|
|
|
Signing Keys
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.5" data-path="../../nats_tools/nsc/revocation.html">
|
|
|
|
<a href="../../nats_tools/nsc/revocation.html">
|
|
|
|
|
|
Revocation
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.3.6" data-path="../../nats_tools/nsc/managed.html">
|
|
|
|
<a href="../../nats_tools/nsc/managed.html">
|
|
|
|
|
|
Managed Operators
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
|
|
</ul>
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="5.4" data-path="../../nats_tools/nas/">
|
|
|
|
<a href="../../nats_tools/nas/">
|
|
|
|
|
|
nats-account-server
|
|
|
|
</a>
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<ul class="articles">
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<li class="chapter " data-level="5.4.1" data-path="../../nats_tools/nas/nas_conf.html">
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<a href="../../nats_tools/nas/nas_conf.html">
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Basics
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</a>
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</li>
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<li class="chapter " data-level="5.4.2" data-path="../../nats_tools/nas/inspecting_jwts.html">
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<a href="../../nats_tools/nas/inspecting_jwts.html">
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Inspecting JWTs
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</a>
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</li>
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<li class="chapter " data-level="5.4.3" data-path="../../nats_tools/nas/dir_store.html">
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<a href="../../nats_tools/nas/dir_store.html">
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Directory Store
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</a>
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</li>
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<li class="chapter " data-level="5.4.4" data-path="../../nats_tools/nas/notifications.html">
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<a href="../../nats_tools/nas/notifications.html">
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Update Notifications
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</a>
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</li>
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<li class="chapter " data-level="5.4.5" data-path="../../nats_tools/nas/mem_resolver.html">
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<a href="../../nats_tools/nas/mem_resolver.html">
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Memory Resolver
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="5.5" data-path="../../nats_tools/nats_top/">
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<a href="../../nats_tools/nats_top/">
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nats-top
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</a>
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<ul class="articles">
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<li class="chapter " data-level="5.5.1" data-path="../../nats_tools/nats_top/nats-top-tutorial.html">
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<a href="../../nats_tools/nats_top/nats-top-tutorial.html">
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Tutorial
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</a>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="5.6" data-path="../../nats_tools/natsbench.html">
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<a href="../../nats_tools/natsbench.html">
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nats-bench
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</a>
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</li>
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<li class="header">NATS Streaming Concepts</li>
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<li class="chapter " data-level="6.1" data-path="../../nats_streaming/intro.html">
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<a href="../../nats_streaming/intro.html">
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Introduction
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</a>
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</li>
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<li class="chapter " data-level="6.2" data-path="../../nats_streaming/relation-to-nats.html">
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<a href="../../nats_streaming/relation-to-nats.html">
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Relation to NATS
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</a>
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</li>
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<li class="chapter " data-level="6.3" data-path="../../nats_streaming/client-connections.html">
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<a href="../../nats_streaming/client-connections.html">
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Client Connections
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</a>
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</li>
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<li class="chapter " data-level="6.4" data-path="../../nats_streaming/channels/channels.html">
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<a href="../../nats_streaming/channels/channels.html">
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Channels
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.4.1" data-path="../../nats_streaming/channels/message-log.html">
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<a href="../../nats_streaming/channels/message-log.html">
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Message Log
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</a>
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</li>
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<li class="chapter " data-level="6.4.2" data-path="../../nats_streaming/channels/subscriptions/subscriptions.html">
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<a href="../../nats_streaming/channels/subscriptions/subscriptions.html">
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Subscriptions
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.4.2.1" data-path="../../nats_streaming/channels/subscriptions/regular.html">
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<a href="../../nats_streaming/channels/subscriptions/regular.html">
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Regular
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</a>
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</li>
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<li class="chapter " data-level="6.4.2.2" data-path="../../nats_streaming/channels/subscriptions/durable.html">
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<a href="../../nats_streaming/channels/subscriptions/durable.html">
|
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Durable
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</a>
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</li>
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<li class="chapter " data-level="6.4.2.3" data-path="../../nats_streaming/channels/subscriptions/queue-group.html">
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<a href="../../nats_streaming/channels/subscriptions/queue-group.html">
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Queue Group
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</a>
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</li>
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<li class="chapter " data-level="6.4.2.4" data-path="../../nats_streaming/channels/subscriptions/redelivery.html">
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<a href="../../nats_streaming/channels/subscriptions/redelivery.html">
|
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Redelivery
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</a>
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</li>
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</ul>
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</li>
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</ul>
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</li>
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<li class="chapter " data-level="6.5" data-path="../../nats_streaming/store-interface.html">
|
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|
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<a href="../../nats_streaming/store-interface.html">
|
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Store Interface
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</a>
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</li>
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<li class="chapter " data-level="6.6" data-path="../../nats_streaming/store-encryption.html">
|
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<a href="../../nats_streaming/store-encryption.html">
|
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Store Encryption
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|
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</a>
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</li>
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|
<li class="chapter " data-level="6.7" data-path="../../nats_streaming/clustering/clustering.html">
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|
|
<a href="../../nats_streaming/clustering/clustering.html">
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Clustering
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</a>
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<ul class="articles">
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<li class="chapter " data-level="6.7.1" data-path="../../nats_streaming/clustering/supported-stores.html">
|
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|
<a href="../../nats_streaming/clustering/supported-stores.html">
|
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Supported Stores
|
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</a>
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</li>
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<li class="chapter " data-level="6.7.2" data-path="../../nats_streaming/clustering/configuration.html">
|
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<a href="../../nats_streaming/clustering/configuration.html">
|
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Configuration
|
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</a>
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</li>
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<li class="chapter " data-level="6.7.3" data-path="../../nats_streaming/clustering/auto-configuration.html">
|
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|
<a href="../../nats_streaming/clustering/auto-configuration.html">
|
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|
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Auto Configuration
|
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</a>
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</li>
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|
<li class="chapter " data-level="6.7.4" data-path="../../nats_streaming/clustering/containers.html">
|
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|
<a href="../../nats_streaming/clustering/containers.html">
|
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|
|
Containers
|
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|
</a>
|
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</li>
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</ul>
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</li>
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|
<li class="chapter " data-level="6.8" data-path="../../nats_streaming/fault-tolerance/ft.html">
|
|
|
|
<a href="../../nats_streaming/fault-tolerance/ft.html">
|
|
|
|
|
|
Fault Tolerance
|
|
|
|
</a>
|
|
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<ul class="articles">
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<li class="chapter " data-level="6.8.1" data-path="../../nats_streaming/fault-tolerance/active-server.html">
|
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|
|
<a href="../../nats_streaming/fault-tolerance/active-server.html">
|
|
|
|
|
|
Active Server
|
|
|
|
</a>
|
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</li>
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|
<li class="chapter " data-level="6.8.2" data-path="../../nats_streaming/fault-tolerance/standby-server.html">
|
|
|
|
<a href="../../nats_streaming/fault-tolerance/standby-server.html">
|
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|
|
Standby Servers
|
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|
|
</a>
|
|
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</li>
|
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|
<li class="chapter " data-level="6.8.3" data-path="../../nats_streaming/fault-tolerance/shared-state.html">
|
|
|
|
<a href="../../nats_streaming/fault-tolerance/shared-state.html">
|
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|
|
|
|
Shared State
|
|
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|
</a>
|
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</li>
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<li class="chapter " data-level="6.8.4" data-path="../../nats_streaming/fault-tolerance/failover.html">
|
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|
|
<a href="../../nats_streaming/fault-tolerance/failover.html">
|
|
|
|
|
|
Failover
|
|
|
|
</a>
|
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</li>
|
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</ul>
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</li>
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|
<li class="chapter " data-level="6.9" data-path="../../nats_streaming/partitioning.html">
|
|
|
|
<a href="../../nats_streaming/partitioning.html">
|
|
|
|
|
|
Partitioning
|
|
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</a>
|
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</li>
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<li class="chapter " data-level="6.10" data-path="../../nats_streaming/monitoring/monitoring.html">
|
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|
|
<a href="../../nats_streaming/monitoring/monitoring.html">
|
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|
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|
|
Monitoring
|
|
|
|
</a>
|
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<ul class="articles">
|
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<li class="chapter " data-level="6.10.1" data-path="../../nats_streaming/monitoring/endpoints.html">
|
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|
<a href="../../nats_streaming/monitoring/endpoints.html">
|
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|
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Endpoints
|
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</a>
|
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</li>
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</ul>
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</li>
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<li class="header">Developing With NATS Streaming</li>
|
|
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|
|
|
|
<li class="chapter " data-level="7.1" data-path="../streaming/">
|
|
|
|
<a href="../streaming/">
|
|
|
|
|
|
Introduction
|
|
|
|
</a>
|
|
|
|
|
|
|
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</li>
|
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|
<li class="chapter " data-level="7.2" data-path="../streaming/connecting.html">
|
|
|
|
<a href="../streaming/connecting.html">
|
|
|
|
|
|
Connecting to NATS Streaming
|
|
|
|
</a>
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="7.3" data-path="../streaming/publishing.html">
|
|
|
|
<a href="../streaming/publishing.html">
|
|
|
|
|
|
Publishing to a Channel
|
|
|
|
</a>
|
|
|
|
|
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|
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</li>
|
|
|
|
<li class="chapter " data-level="7.4" data-path="../streaming/receiving.html">
|
|
|
|
<a href="../streaming/receiving.html">
|
|
|
|
|
|
Receiving Messages from a Channel
|
|
|
|
</a>
|
|
|
|
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="7.5" data-path="../streaming/durables.html">
|
|
|
|
<a href="../streaming/durables.html">
|
|
|
|
|
|
Durable Subscriptions
|
|
|
|
</a>
|
|
|
|
|
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</li>
|
|
|
|
<li class="chapter " data-level="7.6" data-path="../streaming/queues.html">
|
|
|
|
<a href="../streaming/queues.html">
|
|
|
|
|
|
Queue Subscriptions
|
|
|
|
</a>
|
|
|
|
|
|
|
|
</li>
|
|
|
|
<li class="chapter " data-level="7.7" data-path="../streaming/acks.html">
|
|
|
|
<a href="../streaming/acks.html">
|
|
|
|
|
|
Acknowledgements
|
|
|
|
</a>
|
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|
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|
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|
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</li>
|
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|
|
<li class="chapter " data-level="7.8" data-path="../streaming/protocol.html">
|
|
|
|
<a href="../streaming/protocol.html">
|
|
|
|
|
|
The Streaming Protocol
|
|
|
|
</a>
|
|
|
|
|
|
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</li>
|
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|
|
<li class="header">NATS Streaming Server</li>
|
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|
|
|
|
|
|
<li class="chapter " data-level="8.1" data-path="../../nats_streaming/gettingstarted/changes.html">
|
|
|
|
<a href="../../nats_streaming/gettingstarted/changes.html">
|
|
|
|
|
|
Important Changes
|
|
|
|
</a>
|
|
|
|
|
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</li>
|
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|
|
<li class="chapter " data-level="8.2" data-path="../../nats_streaming/gettingstarted/install.html">
|
|
|
|
<a href="../../nats_streaming/gettingstarted/install.html">
|
|
|
|
|
|
Installing
|
|
|
|
</a>
|
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|
|
|
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</li>
|
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|
|
<li class="chapter " data-level="8.3" data-path="../../nats_streaming/gettingstarted/run.html">
|
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|
|
<a href="../../nats_streaming/gettingstarted/run.html">
|
|
|
|
|
|
Running
|
|
|
|
</a>
|
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|
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</li>
|
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|
<li class="chapter " data-level="8.4" data-path="../../nats_streaming/configuring/configuring.html">
|
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|
|
<a href="../../nats_streaming/configuring/configuring.html">
|
|
|
|
|
|
Configuring
|
|
|
|
</a>
|
|
|
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|
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|
|
<ul class="articles">
|
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|
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|
|
<li class="chapter " data-level="8.4.1" data-path="../../nats_streaming/configuring/cmdline.html">
|
|
|
|
<a href="../../nats_streaming/configuring/cmdline.html">
|
|
|
|
|
|
Command line arguments
|
|
|
|
</a>
|
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|
|
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</li>
|
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|
|
<li class="chapter " data-level="8.4.2" data-path="../../nats_streaming/configuring/cfgfile.html">
|
|
|
|
<a href="../../nats_streaming/configuring/cfgfile.html">
|
|
|
|
|
|
Configuration file
|
|
|
|
</a>
|
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|
|
|
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</li>
|
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|
<li class="chapter " data-level="8.4.3" data-path="../../nats_streaming/configuring/storelimits.html">
|
|
|
|
<a href="../../nats_streaming/configuring/storelimits.html">
|
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|
|
|
|
Store Limits
|
|
|
|
</a>
|
|
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|
<ul class="articles">
|
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|
<li class="chapter " data-level="8.4.3.1" data-path="../../nats_streaming/configuring/storelimits.html">
|
|
|
|
<a href="../../nats_streaming/configuring/storelimits.html#limits-inheritance">
|
|
|
|
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|
Limits inheritance
|
|
|
|
</a>
|
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</li>
|
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|
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</ul>
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</li>
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|
<li class="chapter " data-level="8.4.4" data-path="../../nats_streaming/configuring/persistence.html">
|
|
|
|
<a href="../../nats_streaming/configuring/persistence.html">
|
|
|
|
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Persistence
|
|
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|
</a>
|
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<ul class="articles">
|
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<li class="chapter " data-level="8.4.4.1" data-path="../../nats_streaming/configuring/filestore.html">
|
|
|
|
<a href="../../nats_streaming/configuring/filestore.html">
|
|
|
|
|
|
File Store
|
|
|
|
</a>
|
|
|
|
|
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|
<ul class="articles">
|
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|
|
|
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<li class="chapter " data-level="8.4.4.1.1" data-path="../../nats_streaming/configuring/filestore.html">
|
|
|
|
<a href="../../nats_streaming/configuring/filestore.html#options">
|
|
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Options
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Recovery Errors
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<li class="chapter " data-level="8.4.4.2" data-path="../../nats_streaming/configuring/sqlstore.html">
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<a href="../../nats_streaming/configuring/sqlstore.html">
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SQL Store
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</a>
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<ul class="articles">
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<li class="chapter " data-level="8.4.4.2.1" data-path="../../nats_streaming/configuring/sqlstore.html">
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Read and Write Timeouts
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<li class="chapter " data-level="8.4.4.2.2" data-path="../../nats_streaming/configuring/sqlstore.html">
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Options
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<li class="chapter " data-level="8.4.5" data-path="../../nats_streaming/configuring/tls.html">
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<a href="../../nats_streaming/configuring/tls.html">
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Securing
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</a>
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<li class="chapter " data-level="8.4.5.1" data-path="../../nats_streaming/configuring/tls.html">
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<a href="../../nats_streaming/configuring/tls.html#authenticating-users">
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Authenticating Users
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<li class="chapter " data-level="8.4.5.2" data-path="../../nats_streaming/configuring/tls.html">
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<a href="../../nats_streaming/configuring/tls.html#using-tls">
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TLS
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</a>
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Process Signaling
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Windows Service
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Embedding NATS Streaming Server
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Docker Swarm
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</a>
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<li class="header">NATS Protocol</li>
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<li class="chapter " data-level="9.1" data-path="../../nats_protocol/nats-protocol-demo.html">
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Protocol Demo
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Developing a Client
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NATS Cluster Protocol
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href="../.." >Request-Reply Semantics</a>
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</h1>
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<h1 id="request-reply"><a name="request-reply" class="plugin-anchor" href="#request-reply"><i class="fa fa-link" aria-hidden="true"></i></a>Request-Reply</h1>
|
|
<p>The pattern of sending a message and receiving a response is encapsulated in most client libraries into a request method. Under the covers this method will publish a message with a unique reply-to subject and wait for the response before returning.</p>
|
|
<p>In the older versions of some libraries a completely new reply-to subject is created each time. In newer versions, a subject hierarchy is used so that a single subscriber in the client library listens for a wildcard, and requests are sent with a unique child subject of a single subject.</p>
|
|
<p>The primary difference between the request method and publishing with a reply-to is that the library is only going to accept one response, and in most libraries the request will be treated as a synchronous action. The library may even provide a way to set the timeout.</p>
|
|
<p>For example, updating the previous publish example we may request <code>time</code> with a one second timeout:</p>
|
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<div class="tab-wrap">
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<input type="radio" id="request_reply_go" name="request_reply" class="tab" checked>
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<label for="request_reply_go" class="api-lang" data-language="go">Go</label>
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<input type="radio" id="request_reply_java" name="request_reply" class="tab">
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<label for="request_reply_java" class="api-lang" data-language="java">Java</label>
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<input type="radio" id="request_reply_js" name="request_reply" class="tab">
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<label for="request_reply_js" class="api-lang" data-language="js">JavaScript</label>
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<input type="radio" id="request_reply_py" name="request_reply" class="tab">
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<label for="request_reply_py" class="api-lang" data-language="py">Python</label>
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<input type="radio" id="request_reply_ruby" name="request_reply" class="tab">
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<label for="request_reply_ruby" class="api-lang" data-language="ruby">Ruby</label>
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<input type="radio" id="request_reply_ts" name="request_reply" class="tab">
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<label for="request_reply_ts" class="api-lang" data-language="ts">TypeScript</label>
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<div class="tab__content">
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<pre id="request_reply_go_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/go-nats-examples/blob/master/api-examples/request_reply/main.go#L11-29"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-go">nc<span class="token punctuation">,</span> err <span class="token operator">:=</span> nats<span class="token punctuation">.</span><span class="token function">Connect</span><span class="token punctuation">(</span><span class="token string">"demo.nats.io"</span><span class="token punctuation">)</span>
|
|
<span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
|
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log<span class="token punctuation">.</span><span class="token function">Fatal</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
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<span class="token keyword">defer</span> nc<span class="token punctuation">.</span><span class="token function">Close</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
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|
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|
<span class="token comment">// Send the request</span>
|
|
msg<span class="token punctuation">,</span> err <span class="token operator">:=</span> nc<span class="token punctuation">.</span><span class="token function">Request</span><span class="token punctuation">(</span><span class="token string">"time"</span><span class="token punctuation">,</span> <span class="token boolean">nil</span><span class="token punctuation">,</span> time<span class="token punctuation">.</span>Second<span class="token punctuation">)</span>
|
|
<span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
|
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log<span class="token punctuation">.</span><span class="token function">Fatal</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
<span class="token comment">// Use the response</span>
|
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log<span class="token punctuation">.</span><span class="token function">Printf</span><span class="token punctuation">(</span><span class="token string">"Reply: %s"</span><span class="token punctuation">,</span> msg<span class="token punctuation">.</span>Data<span class="token punctuation">)</span>
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|
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<span class="token comment">// Close the connection</span>
|
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nc<span class="token punctuation">.</span><span class="token function">Close</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
</code></pre>
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</div>
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<div class="tab__content">
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<pre id="request_reply_java_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/java-nats-examples/blob/master/src/main/java/io/nats/examples/RequestReply.java#L14-25"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-java"><span class="token class-name">Connection</span> nc <span class="token operator">=</span> <span class="token class-name">Nats</span><span class="token punctuation">.</span><span class="token function">connect</span><span class="token punctuation">(</span><span class="token string">"nats://demo.nats.io:4222"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token comment">// Send the request</span>
|
|
<span class="token class-name">Message</span> msg <span class="token operator">=</span> nc<span class="token punctuation">.</span><span class="token function">request</span><span class="token punctuation">(</span><span class="token string">"time"</span><span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">,</span> <span class="token class-name">Duration</span><span class="token punctuation">.</span><span class="token function">ofSeconds</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token comment">// Use the response</span>
|
|
<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">String</span><span class="token punctuation">(</span>msg<span class="token punctuation">.</span><span class="token function">getData</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token class-name">StandardCharsets</span><span class="token punctuation">.</span>UTF_8<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token comment">// Close the connection</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
</div>
|
|
|
|
<div class="tab__content">
|
|
<pre id="request_reply_js_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/node-nats-examples/blob/master/src/publisher_samples.js#L66-80"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-javascript"><span class="token keyword">let</span> nc <span class="token operator">=</span> <span class="token constant">NATS</span><span class="token punctuation">.</span><span class="token function">connect</span><span class="token punctuation">(</span><span class="token punctuation">{</span>url<span class="token punctuation">:</span> <span class="token string">"nats://demo.nats.io:4222"</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
<span class="token comment">// set up a subscription to process the request</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">subscribe</span><span class="token punctuation">(</span><span class="token string">'time'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">msg<span class="token punctuation">,</span> reply</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">if</span><span class="token punctuation">(</span>reply<span class="token punctuation">)</span> <span class="token punctuation">{</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">publish</span><span class="token punctuation">(</span>reply<span class="token punctuation">,</span> <span class="token keyword">new</span> <span class="token class-name">Date</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toLocaleTimeString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
|
|
nc<span class="token punctuation">.</span><span class="token function">requestOne</span><span class="token punctuation">(</span><span class="token string">'time'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">msg</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">{</span>
|
|
t<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'the time is'</span><span class="token punctuation">,</span> msg<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
</div>
|
|
|
|
<div class="tab__content">
|
|
<pre id="request_reply_py_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/asyncio-nats-examples/blob/master/request_reply.py#L8-25"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-python">nc <span class="token operator">=</span> NATS<span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token keyword">async</span> <span class="token keyword">def</span> <span class="token function">sub</span><span class="token punctuation">(</span>msg<span class="token punctuation">)</span><span class="token punctuation">:</span>
|
|
<span class="token keyword">await</span> nc<span class="token punctuation">.</span>publish<span class="token punctuation">(</span>msg<span class="token punctuation">.</span>reply<span class="token punctuation">,</span> <span class="token string">b'response'</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token keyword">await</span> nc<span class="token punctuation">.</span>connect<span class="token punctuation">(</span>servers<span class="token operator">=</span><span class="token punctuation">[</span><span class="token string">"nats://demo.nats.io:4222"</span><span class="token punctuation">]</span><span class="token punctuation">)</span>
|
|
<span class="token keyword">await</span> nc<span class="token punctuation">.</span>subscribe<span class="token punctuation">(</span><span class="token string">"time"</span><span class="token punctuation">,</span> cb<span class="token operator">=</span>sub<span class="token punctuation">)</span>
|
|
|
|
<span class="token comment"># Send the request</span>
|
|
<span class="token keyword">try</span><span class="token punctuation">:</span>
|
|
msg <span class="token operator">=</span> <span class="token keyword">await</span> nc<span class="token punctuation">.</span>request<span class="token punctuation">(</span><span class="token string">"time"</span><span class="token punctuation">,</span> <span class="token string">b''</span><span class="token punctuation">,</span> timeout<span class="token operator">=</span><span class="token number">1</span><span class="token punctuation">)</span>
|
|
<span class="token comment"># Use the response</span>
|
|
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">"Reply:"</span><span class="token punctuation">,</span> msg<span class="token punctuation">)</span>
|
|
<span class="token keyword">except</span> asyncio<span class="token punctuation">.</span>TimeoutError<span class="token punctuation">:</span>
|
|
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">"Timed out waiting for response"</span><span class="token punctuation">)</span>
|
|
|
|
</code></pre>
|
|
</div>
|
|
|
|
<div class="tab__content">
|
|
<pre id="request_reply_ruby_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ruby-nats-examples/blob/master/request_reply.rb#L1-17"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-ruby"><span class="token keyword">require</span> <span class="token string">'nats/client'</span>
|
|
<span class="token keyword">require</span> <span class="token string">'fiber'</span>
|
|
|
|
<span class="token constant">NATS</span><span class="token punctuation">.</span>start<span class="token punctuation">(</span>servers<span class="token punctuation">:</span><span class="token punctuation">[</span><span class="token string">"nats://127.0.0.1:4222"</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token keyword">do</span> <span class="token operator">|</span>nc<span class="token operator">|</span>
|
|
nc<span class="token punctuation">.</span>subscribe<span class="token punctuation">(</span><span class="token string">"time"</span><span class="token punctuation">)</span> <span class="token keyword">do</span> <span class="token operator">|</span>msg<span class="token punctuation">,</span> reply<span class="token operator">|</span>
|
|
nc<span class="token punctuation">.</span>publish<span class="token punctuation">(</span>reply<span class="token punctuation">,</span> <span class="token string">"response"</span><span class="token punctuation">)</span>
|
|
<span class="token keyword">end</span>
|
|
|
|
<span class="token constant">Fiber</span><span class="token punctuation">.</span><span class="token keyword">new</span> <span class="token class-name">do</span>
|
|
<span class="token comment"># Use the response</span>
|
|
msg <span class="token operator">=</span> nc<span class="token punctuation">.</span>request<span class="token punctuation">(</span><span class="token string">"time"</span><span class="token punctuation">,</span> <span class="token string">""</span><span class="token punctuation">)</span>
|
|
puts <span class="token string">"Reply: <span class="token interpolation"><span class="token delimiter tag">#{</span>msg<span class="token delimiter tag">}</span></span>"</span>
|
|
<span class="token keyword">end</span><span class="token punctuation">.</span>resume
|
|
<span class="token keyword">end</span>
|
|
|
|
</code></pre>
|
|
</div>
|
|
|
|
<div class="tab__content">
|
|
<pre id="request_reply_ts_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ts-nats-examples/blob/master/src/publisher_samples.ts#L78-82"><i class="mdi mdi-github-circle" title="View on GitHub"></i></a><a class="toolbar-icons pull-right"><i class="mdi mdi-content-copy js-copy" title="Copy to Clipboard"></i></a><span class="copy-msg pull-right"></span><code class="language-javascript"><span class="token keyword">let</span> msg <span class="token operator">=</span> <span class="token keyword">await</span> nc<span class="token punctuation">.</span><span class="token function">request</span><span class="token punctuation">(</span><span class="token string">'time'</span><span class="token punctuation">,</span> <span class="token number">1000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
t<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'the time is'</span><span class="token punctuation">,</span> msg<span class="token punctuation">.</span>data<span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
|
|
</code></pre>
|
|
</div>
|
|
|
|
</div>
|
|
<p>You can think of request-reply in the library as a subscribe, get one message, unsubscribe pattern. In Go this might look something like:</p>
|
|
<pre class="language-"><code class="lang-go">sub<span class="token punctuation">,</span> err <span class="token operator">:=</span> nc<span class="token punctuation">.</span><span class="token function">SubscribeSync</span><span class="token punctuation">(</span>replyTo<span class="token punctuation">)</span>
|
|
<span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
|
|
log<span class="token punctuation">.</span><span class="token function">Fatal</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">Flush</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token comment">// Send the request</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">PublishRequest</span><span class="token punctuation">(</span>subject<span class="token punctuation">,</span> replyTo<span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token function">byte</span><span class="token punctuation">(</span>input<span class="token punctuation">)</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token comment">// Wait for a single response</span>
|
|
<span class="token keyword">for</span> <span class="token punctuation">{</span>
|
|
msg<span class="token punctuation">,</span> err <span class="token operator">:=</span> sub<span class="token punctuation">.</span><span class="token function">NextMsg</span><span class="token punctuation">(</span><span class="token number">1</span> <span class="token operator">*</span> time<span class="token punctuation">.</span>Second<span class="token punctuation">)</span>
|
|
<span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
|
|
log<span class="token punctuation">.</span><span class="token function">Fatal</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
response <span class="token operator">=</span> <span class="token function">string</span><span class="token punctuation">(</span>msg<span class="token punctuation">.</span>Data<span class="token punctuation">)</span>
|
|
<span class="token keyword">break</span>
|
|
<span class="token punctuation">}</span>
|
|
sub<span class="token punctuation">.</span><span class="token function">Unsubscribe</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
</code></pre>
|
|
<h2 id="scatter-gather"><a name="scatter-gather" class="plugin-anchor" href="#scatter-gather"><i class="fa fa-link" aria-hidden="true"></i></a>Scatter-Gather</h2>
|
|
<p>You can expand the request-reply pattern into something often called scatter-gather. To receive multiple messages, with a timeout, you could do something like the following, where the loop getting messages is using time as the limitation, not the receipt of a single message:</p>
|
|
<pre class="language-"><code class="lang-go">sub<span class="token punctuation">,</span> err <span class="token operator">:=</span> nc<span class="token punctuation">.</span><span class="token function">SubscribeSync</span><span class="token punctuation">(</span>replyTo<span class="token punctuation">)</span>
|
|
<span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
|
|
log<span class="token punctuation">.</span><span class="token function">Fatal</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">Flush</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token comment">// Send the request</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">PublishRequest</span><span class="token punctuation">(</span>subject<span class="token punctuation">,</span> replyTo<span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token function">byte</span><span class="token punctuation">(</span>input<span class="token punctuation">)</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token comment">// Wait for a single response</span>
|
|
max <span class="token operator">:=</span> <span class="token number">100</span> <span class="token operator">*</span> time<span class="token punctuation">.</span>Millisecond
|
|
start <span class="token operator">:=</span> time<span class="token punctuation">.</span><span class="token function">Now</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
<span class="token keyword">for</span> time<span class="token punctuation">.</span><span class="token function">Now</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">Sub</span><span class="token punctuation">(</span>start<span class="token punctuation">)</span> <span class="token operator"><</span> max <span class="token punctuation">{</span>
|
|
msg<span class="token punctuation">,</span> err <span class="token operator">:=</span> sub<span class="token punctuation">.</span><span class="token function">NextMsg</span><span class="token punctuation">(</span><span class="token number">1</span> <span class="token operator">*</span> time<span class="token punctuation">.</span>Second<span class="token punctuation">)</span>
|
|
<span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">break</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
responses <span class="token operator">=</span> <span class="token function">append</span><span class="token punctuation">(</span>responses<span class="token punctuation">,</span> <span class="token function">string</span><span class="token punctuation">(</span>msg<span class="token punctuation">.</span>Data<span class="token punctuation">)</span><span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
|
sub<span class="token punctuation">.</span><span class="token function">Unsubscribe</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
</code></pre>
|
|
<p>Or, you can loop on a counter and a timeout to try to get <em>at least N</em> responses:</p>
|
|
<pre class="language-"><code class="lang-go">sub<span class="token punctuation">,</span> err <span class="token operator">:=</span> nc<span class="token punctuation">.</span><span class="token function">SubscribeSync</span><span class="token punctuation">(</span>replyTo<span class="token punctuation">)</span>
|
|
<span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
|
|
log<span class="token punctuation">.</span><span class="token function">Fatal</span><span class="token punctuation">(</span>err<span class="token punctuation">)</span>
|
|
<span class="token punctuation">}</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">Flush</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token comment">// Send the request</span>
|
|
nc<span class="token punctuation">.</span><span class="token function">PublishRequest</span><span class="token punctuation">(</span>subject<span class="token punctuation">,</span> replyTo<span class="token punctuation">,</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token function">byte</span><span class="token punctuation">(</span>input<span class="token punctuation">)</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token comment">// Wait for a single response</span>
|
|
max <span class="token operator">:=</span> <span class="token number">500</span> <span class="token operator">*</span> time<span class="token punctuation">.</span>Millisecond
|
|
start <span class="token operator">:=</span> time<span class="token punctuation">.</span><span class="token function">Now</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
<span class="token keyword">for</span> time<span class="token punctuation">.</span><span class="token function">Now</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">Sub</span><span class="token punctuation">(</span>start<span class="token punctuation">)</span> <span class="token operator"><</span> max <span class="token punctuation">{</span>
|
|
msg<span class="token punctuation">,</span> err <span class="token operator">:=</span> sub<span class="token punctuation">.</span><span class="token function">NextMsg</span><span class="token punctuation">(</span><span class="token number">1</span> <span class="token operator">*</span> time<span class="token punctuation">.</span>Second<span class="token punctuation">)</span>
|
|
<span class="token keyword">if</span> err <span class="token operator">!=</span> <span class="token boolean">nil</span> <span class="token punctuation">{</span>
|
|
<span class="token keyword">break</span>
|
|
<span class="token punctuation">}</span>
|
|
|
|
responses <span class="token operator">=</span> <span class="token function">append</span><span class="token punctuation">(</span>responses<span class="token punctuation">,</span> <span class="token function">string</span><span class="token punctuation">(</span>msg<span class="token punctuation">.</span>Data<span class="token punctuation">)</span><span class="token punctuation">)</span>
|
|
|
|
<span class="token keyword">if</span> <span class="token function">len</span><span class="token punctuation">(</span>responses<span class="token punctuation">)</span> <span class="token operator">>=</span> minResponses <span class="token punctuation">{</span>
|
|
<span class="token keyword">break</span>
|
|
<span class="token punctuation">}</span>
|
|
<span class="token punctuation">}</span>
|
|
sub<span class="token punctuation">.</span><span class="token function">Unsubscribe</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
|
|
</code></pre>
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});
|
|
}
|
|
}
|
|
|
|
setTimeout(function () {
|
|
processGraphVizSections();
|
|
}, 1);
|
|
}
|
|
|
|
|
|
if (document.readyState != 'loading') docReady();
|
|
else if (document.addEventListener) document.addEventListener('DOMContentLoaded', docReady);
|
|
else document.attachEvent('onreadystatechange', function () {
|
|
if (document.readyState == 'complete') docReady();
|
|
});
|
|
</script>
|
|
|
|
<!-- Github Buttons -->
|
|
<script async defer src="https://buttons.github.io/buttons.js"></script>
|
|
|
|
<!-- Styles -->
|
|
<style>
|
|
.nats {
|
|
display: inline-block;
|
|
width: 16px;
|
|
height: 16px;
|
|
background: url(https://nats.io/img/nats-icon-color.svg);
|
|
background-size: 16px 16px;
|
|
background-repeat: no-repeat;
|
|
}
|
|
|
|
div.graphviz {
|
|
background: transparent;
|
|
border: 0;
|
|
padding-top: 15px;
|
|
padding-right: 15px;
|
|
padding-bottom: 25px;
|
|
padding-left: 15px;
|
|
text-align: center;
|
|
}
|
|
|
|
code[data-viz] {
|
|
display: none;
|
|
}
|
|
|
|
.tab-wrap {
|
|
transition: 0.3s box-shadow ease;
|
|
border-radius: 6px;
|
|
max-width: 100%;
|
|
display: flex;
|
|
flex-wrap: wrap;
|
|
position: relative;
|
|
list-style: none;
|
|
background-color: #fff;
|
|
margin: 20px 0;
|
|
/* box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);*/
|
|
}
|
|
|
|
.tab-wrap:hover {
|
|
box-shadow: 0 12px 23px rgba(0, 0, 0, 0.23), 0 10px 10px rgba(0, 0, 0, 0.19);
|
|
}
|
|
|
|
.tab {
|
|
display: none;
|
|
}
|
|
|
|
/* Using scss these would be generated, we have to manually create enough for all tabs, start with 8 */
|
|
.tab:checked:nth-of-type(1)~.tab__content:nth-of-type(1) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(2)~.tab__content:nth-of-type(2) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(3)~.tab__content:nth-of-type(3) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(4)~.tab__content:nth-of-type(4) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(5)~.tab__content:nth-of-type(5) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(6)~.tab__content:nth-of-type(6) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(7)~.tab__content:nth-of-type(7) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:checked:nth-of-type(8)~.tab__content:nth-of-type(8) {
|
|
opacity: 1;
|
|
transition: 0.5s opacity ease-in, 0.8s -webkit-transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease;
|
|
transition: 0.5s opacity ease-in, 0.8s transform ease, 0.8s -webkit-transform ease;
|
|
position: relative;
|
|
top: 0;
|
|
z-index: 100;
|
|
-webkit-transform: translateY(0px);
|
|
transform: translateY(0px);
|
|
text-shadow: 0 0 0;
|
|
}
|
|
|
|
.tab:first-of-type:not(:last-of-type)+label {
|
|
border-top-right-radius: 0;
|
|
border-bottom-right-radius: 0;
|
|
}
|
|
|
|
.tab:not(:first-of-type):not(:last-of-type)+label {
|
|
border-radius: 0;
|
|
}
|
|
|
|
.tab:last-of-type:not(:first-of-type)+label {
|
|
border-top-left-radius: 0;
|
|
border-bottom-left-radius: 0;
|
|
}
|
|
|
|
.tab:checked+label {
|
|
background-color: #fff;
|
|
box-shadow: 0 -1px 0 #fff inset;
|
|
cursor: default;
|
|
font-weight: bold;
|
|
border: 1px solid #ddd;
|
|
border-bottom-color: transparent;
|
|
}
|
|
|
|
.tab:checked+label:hover {
|
|
box-shadow: 0 -1px 0 #fff inset;
|
|
background-color: #fff;
|
|
}
|
|
|
|
.tab+label {
|
|
box-shadow: 0 -1px 0 #eee inset;
|
|
border-radius: 6px 6px 0 0;
|
|
cursor: pointer;
|
|
display: block;
|
|
text-decoration: none;
|
|
color: #27aae1;
|
|
flex-grow: 3;
|
|
text-align: center;
|
|
-webkit-user-select: none;
|
|
-moz-user-select: none;
|
|
-ms-user-select: none;
|
|
user-select: none;
|
|
text-align: center;
|
|
transition: 0.3s background-color ease, 0.3s box-shadow ease;
|
|
height: 50px;
|
|
box-sizing: border-box;
|
|
padding: 15px;
|
|
}
|
|
|
|
.tab+label:hover {
|
|
background-color: #f9f9f9;
|
|
box-shadow: 0 1px 0 #f4f4f4 inset;
|
|
}
|
|
|
|
.tab__content {
|
|
padding: 2px 2px;
|
|
background-color: transparent;
|
|
position: absolute;
|
|
width: 100%;
|
|
z-index: -1;
|
|
opacity: 0;
|
|
left: 0;
|
|
-webkit-transform: translateY(-3px);
|
|
transform: translateY(-3px);
|
|
border-radius: 6px;
|
|
}
|
|
|
|
.tab__content pre {
|
|
margin-bottom: 0px !important;
|
|
}
|
|
|
|
.toolbar-icons {
|
|
display: inline-block;
|
|
position: relative;
|
|
padding-left: 4px;
|
|
}
|
|
|
|
a.toolbar-icons {
|
|
text-decoration: none;
|
|
}
|
|
|
|
.toolbar-icons .mdi {
|
|
color: #4183c4;
|
|
}
|
|
|
|
.copy-msg {
|
|
color: #4183c4;
|
|
}
|
|
|
|
.pull-right {
|
|
float: right !important;
|
|
}
|
|
|
|
.pull-left {
|
|
float: left !important;
|
|
}
|
|
</style>
|
|
<!-- Global site tag (gtag.js) - Google Analytics -->
|
|
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-111730698-1"></script>
|
|
<script>
|
|
window.dataLayer = window.dataLayer || [];
|
|
function gtag(){dataLayer.push(arguments);}
|
|
gtag('js', new Date());
|
|
|
|
gtag('config', 'UA-111730698-1');
|
|
</script>
|
|
|
|
|
|
<script src="../../gitbook/gitbook.js"></script>
|
|
<script src="../../gitbook/theme.js"></script>
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-toggle-chapters/toggle.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-edit-link/plugin.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-search/search-engine.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-search/search.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-lunr/lunr.min.js"></script>
|
|
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|
|
|
|
<script src="../../gitbook/gitbook-plugin-lunr/search-lunr.js"></script>
|
|
|
|
|
|
|
|
<script src="../../gitbook/gitbook-plugin-fontsettings/fontsettings.js"></script>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|
|
|