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<title>Monitoring the Connection ยท NATS</title>
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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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<li class="header">Concepts</li>
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What is NATS
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Subject-Based Messaging
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Publish-Subscribe
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Request-Reply
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Queue Groups
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Acknowledgements
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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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Connecting to a Specific Server
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Connecting to a Cluster
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Setting a Connect Timeout
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Ping/Pong Protocol
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Controlling the Client/Server Protocol
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Turning Off Echo'd Messages
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Automatic Reconnections
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Disabling Reconnect
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Set the Number of Reconnect Attempts
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Pausing Between Reconnect Attempts
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Avoiding the Thundering Herd
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Listening for Reconnect Events
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Buffering Messages During Reconnect Attempts
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Securing Connections
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Authenticating with a User and Password
</a>
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Authenticating with a Token
</a>
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Authenticating with an NKey
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Authenticating with a Credentials File
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Encrypting Connections with TLS
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Receiving Messages
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Synchronous Subscriptions
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Asynchronous Subscriptions
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Unsubscribing
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Unsubscribing After N Messages
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Replying to a Message
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Wildcard Subscriptions
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Queue Subscriptions
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Draining Messages Before Disconnect
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Structured Data
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Sending Messages
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Including a Reply Subject
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Request-Reply Semantics
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Caches, Flush and Ping
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Sending Structured Data
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Monitoring the Connection
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Listen for Connection Events
</a>
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<li class="chapter " data-level="3.7.2" data-path="slow.html">
<a href="slow.html">
Slow Consumers
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</li>
</ul>
</li>
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Tutorials
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<ul class="articles">
<li class="chapter " data-level="3.8.1" data-path="../tutorials/pubsub.html">
<a href="../tutorials/pubsub.html">
Explore NATS Pub/Sub
</a>
</li>
<li class="chapter " data-level="3.8.2" data-path="../tutorials/reqreply.html">
<a href="../tutorials/reqreply.html">
Explore NATS Request/Reply
</a>
</li>
<li class="chapter " data-level="3.8.3" data-path="../tutorials/queues.html">
<a href="../tutorials/queues.html">
Explore NATS Queueing
</a>
</li>
<li class="chapter " data-level="3.8.4" data-path="../tutorials/custom_dialer.html">
<a href="../tutorials/custom_dialer.html">
Advanced Connect and Custom Dialer in Go
</a>
</li>
</ul>
</li>
<li class="header">NATS Server</li>
<li class="chapter " data-level="4.1" data-path="../../nats_server/installation.html">
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Installing
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<a href="../../nats_server/running.html">
Running
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<a href="../../nats_server/windows_srv.html">
Window Service
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Clients
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Flags
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Configuration
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Securing NATS
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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
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Authentication
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Tokens
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<a href="../../nats_server/username_password.html">
Username/Password
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TLS Authentication
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<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
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<li class="chapter " data-level="4.5.1.2.5" data-path="../../nats_server/accounts.html">
<a href="../../nats_server/accounts.html">
Accounts
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<a href="../../nats_server/jwt_auth.html">
JWTs
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<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/tutorial.html">
<a href="../../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>
</ul>
</li>
<li class="chapter " data-level="5.4" data-path="../../nats_tools/nas/">
<a href="../../nats_tools/nas/">
nats-account-server
</a>
<ul class="articles">
<li class="chapter " data-level="5.4.1" data-path="../../nats_tools/nas/nas_conf.html">
<a href="../../nats_tools/nas/nas_conf.html">
Basics
</a>
</li>
<li class="chapter " data-level="5.4.2" data-path="../../nats_tools/nas/inspecting_jwts.html">
<a href="../../nats_tools/nas/inspecting_jwts.html">
Inspecting JWTs
</a>
</li>
<li class="chapter " data-level="5.4.3" data-path="../../nats_tools/nas/mem_resolver.html">
<a href="../../nats_tools/nas/mem_resolver.html">
Memory Resolver
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="5.5" data-path="../../nats_tools/nats_top/">
<a href="../../nats_tools/nats_top/">
nats-top
</a>
<ul class="articles">
<li class="chapter " data-level="5.5.1" data-path="../../nats_tools/nats_top/tutorial.html">
<a href="../../nats_tools/nats_top/tutorial.html">
Tutorial
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="5.6" data-path="../../nats_tools/natsbench.html">
<a href="../../nats_tools/natsbench.html">
nats-bench
</a>
</li>
<li class="header">NATS Streaming Concepts</li>
<li class="chapter " data-level="6.1" data-path="../../nats_streaming/intro.html">
<a href="../../nats_streaming/intro.html">
Introduction
</a>
<ul class="articles">
<li class="chapter " data-level="6.1.1" data-path="../../nats_streaming/relation-to-nats.html">
<a href="../../nats_streaming/relation-to-nats.html">
Relation to NATS
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="6.2" data-path="../../nats_streaming/client-connections.html">
<a href="../../nats_streaming/client-connections.html">
Client Connections
</a>
</li>
<li class="chapter " data-level="6.3" data-path="../../nats_streaming/channels/channels.html">
<a href="../../nats_streaming/channels/channels.html">
Channels
</a>
<ul class="articles">
<li class="chapter " data-level="6.3.1" data-path="../../nats_streaming/channels/message-log.html">
<a href="../../nats_streaming/channels/message-log.html">
Message Log
</a>
</li>
<li class="chapter " data-level="6.3.2" data-path="../../nats_streaming/channels/subscriptions/subscriptions.html">
<a href="../../nats_streaming/channels/subscriptions/subscriptions.html">
Subscriptions
</a>
<ul class="articles">
<li class="chapter " data-level="6.3.2.1" data-path="../../nats_streaming/channels/subscriptions/regular.html">
<a href="../../nats_streaming/channels/subscriptions/regular.html">
Regular
</a>
</li>
<li class="chapter " data-level="6.3.2.2" data-path="../../nats_streaming/channels/subscriptions/durable.html">
<a href="../../nats_streaming/channels/subscriptions/durable.html">
Durable
</a>
</li>
<li class="chapter " data-level="6.3.2.3" data-path="../../nats_streaming/channels/subscriptions/queue-group.html">
<a href="../../nats_streaming/channels/subscriptions/queue-group.html">
Queue Group
</a>
</li>
<li class="chapter " data-level="6.3.2.4" data-path="../../nats_streaming/channels/subscriptions/redelivery.html">
<a href="../../nats_streaming/channels/subscriptions/redelivery.html">
Redelivery
</a>
</li>
</ul>
</li>
</ul>
</li>
<li class="chapter " data-level="6.4" data-path="../../nats_streaming/store-interface.html">
<a href="../../nats_streaming/store-interface.html">
Store Interface
</a>
</li>
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<h1 id="monitoring-the-connection"><a name="monitoring-the-connection" class="plugin-anchor" href="#monitoring-the-connection"><i class="fa fa-link" aria-hidden="true"></i></a>Monitoring the Connection</h1>
<p>Managing the interaction with the server is primarily the job of the client library but most of the libraries also provide some insight into what is happening under the covers.</p>
<p>For example, the client library may provide a mechanism to get the connection&apos;s current status:</p>
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<pre id="connect_status_go_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/go-nats-examples/blob/master/api-examples/connect_status/main.go#L10-33"><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">&quot;demo.nats.io&quot;</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>
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 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>
getStatusTxt <span class="token operator">:=</span> <span class="token keyword">func</span><span class="token punctuation">(</span>nc <span class="token operator">*</span>nats<span class="token punctuation">.</span>Conn<span class="token punctuation">)</span> <span class="token builtin">string</span> <span class="token punctuation">{</span>
<span class="token keyword">switch</span> nc<span class="token punctuation">.</span><span class="token function">Status</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token keyword">case</span> nats<span class="token punctuation">.</span>CONNECTED<span class="token punctuation">:</span>
<span class="token keyword">return</span> <span class="token string">&quot;Connected&quot;</span>
<span class="token keyword">case</span> nats<span class="token punctuation">.</span>CLOSED<span class="token punctuation">:</span>
<span class="token keyword">return</span> <span class="token string">&quot;Closed&quot;</span>
<span class="token keyword">default</span><span class="token punctuation">:</span>
<span class="token keyword">return</span> <span class="token string">&quot;Other&quot;</span>
<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
log<span class="token punctuation">.</span><span class="token function">Printf</span><span class="token punctuation">(</span><span class="token string">&quot;The connection is %v\n&quot;</span><span class="token punctuation">,</span> <span class="token function">getStatusTxt</span><span class="token punctuation">(</span>nc<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>
log<span class="token punctuation">.</span><span class="token function">Printf</span><span class="token punctuation">(</span><span class="token string">&quot;The connection is %v\n&quot;</span><span class="token punctuation">,</span> <span class="token function">getStatusTxt</span><span class="token punctuation">(</span>nc<span class="token punctuation">)</span><span class="token punctuation">)</span>
</code></pre>
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<pre id="connect_status_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/GetConnectionStatus.java#L10-18"><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">&quot;nats://demo.nats.io:4222&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</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 string">&quot;The Connection is: &quot;</span> <span class="token operator">+</span> nc<span class="token punctuation">.</span><span class="token function">getStatus</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">close</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</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 string">&quot;The Connection is: &quot;</span> <span class="token operator">+</span> nc<span class="token punctuation">.</span><span class="token function">getStatus</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="connect_status_js_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/node-nats-examples/blob/master/src/event_samples.js#L99-113"><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 string">&quot;nats://demo.nats.io:4222&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// on node you *must* register an error listener. If not registered</span>
<span class="token comment">// the library emits an &apos;error&apos; event, the node process will exit.</span>
nc<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">&apos;error&apos;</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">err</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</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">&apos;client got an error:&apos;</span><span class="token punctuation">,</span> err<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 keyword">if</span><span class="token punctuation">(</span>nc<span class="token punctuation">.</span>closed<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">&apos;client is closed&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">else</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">&apos;client is not closed&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
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<pre id="connect_status_py_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/asyncio-nats-examples/blob/master/connect_status.py#L6-27"><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">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">&quot;nats://demo.nats.io:4222&quot;</span><span class="token punctuation">]</span><span class="token punctuation">,</span>
<span class="token punctuation">)</span>
<span class="token comment"># Do something with the connection.</span>
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">&quot;The connection is connected?&quot;</span><span class="token punctuation">,</span> nc<span class="token punctuation">.</span>is_connected<span class="token punctuation">)</span>
<span class="token keyword">while</span> <span class="token boolean">True</span><span class="token punctuation">:</span>
<span class="token keyword">if</span> nc<span class="token punctuation">.</span>is_reconnecting<span class="token punctuation">:</span>
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">&quot;Reconnecting to NATS...&quot;</span><span class="token punctuation">)</span>
<span class="token keyword">break</span>
<span class="token keyword">await</span> asyncio<span class="token punctuation">.</span>sleep<span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span>
<span class="token keyword">await</span> nc<span class="token punctuation">.</span>close<span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token keyword">print</span><span class="token punctuation">(</span><span class="token string">&quot;The connection is closed?&quot;</span><span class="token punctuation">,</span> nc<span class="token punctuation">.</span>is_closed<span class="token punctuation">)</span>
</code></pre>
</div>
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<pre id="connect_status_ruby_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ruby-nats-examples/blob/master/connect_status.rb#L3-21"><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 constant">NATS</span><span class="token punctuation">.</span>start<span class="token punctuation">(</span>max_reconnect_attempts<span class="token punctuation">:</span> <span class="token number">2</span><span class="token punctuation">)</span> <span class="token keyword">do</span> <span class="token operator">|</span>nc<span class="token operator">|</span>
puts <span class="token string">&quot;Connect is connected?: <span class="token interpolation"><span class="token delimiter tag">#{</span>nc<span class="token punctuation">.</span>connected<span class="token operator">?</span><span class="token delimiter tag">}</span></span>&quot;</span>
timer <span class="token operator">=</span> <span class="token constant">EM</span><span class="token punctuation">.</span>add_periodic_timer<span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span> <span class="token keyword">do</span>
<span class="token keyword">if</span> nc<span class="token punctuation">.</span>closing<span class="token operator">?</span>
puts <span class="token string">&quot;Connection closed...&quot;</span>
<span class="token constant">EM</span><span class="token punctuation">.</span>cancel_timer<span class="token punctuation">(</span>timer<span class="token punctuation">)</span>
<span class="token constant">NATS</span><span class="token punctuation">.</span>stop
<span class="token keyword">end</span>
<span class="token keyword">if</span> nc<span class="token punctuation">.</span>reconnecting<span class="token operator">?</span>
puts <span class="token string">&quot;Reconnecting to NATS...&quot;</span>
<span class="token keyword">next</span>
<span class="token keyword">end</span>
<span class="token keyword">end</span>
<span class="token keyword">end</span>
</code></pre>
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<pre id="connect_status_ts_content"><a class="toolbar-icons pull-right" target="_blank" href="https://github.com/nats-io/ts-nats-examples/blob/master/src/event_samples.ts#L62-68"><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">if</span><span class="token punctuation">(</span>nc<span class="token punctuation">.</span><span class="token function">isClosed</span><span class="token punctuation">(</span><span class="token punctuation">)</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">&apos;the client is closed&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span> <span class="token keyword">else</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">&apos;the client is running&apos;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
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