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<title>Store Interface ยท NATS</title>
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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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<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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<li class="chapter " data-level="3.2.5" data-path="../developer/connecting/pingpong.html">
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Ping/Pong Protocol
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<li class="chapter " data-level="3.2.6" data-path="../developer/connecting/protocol.html">
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Controlling the Client/Server Protocol
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<li class="chapter " data-level="3.2.7" data-path="../developer/connecting/noecho.html">
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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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<li class="chapter " data-level="3.3.4" data-path="../developer/reconnect/random.html">
<a href="../developer/reconnect/random.html">
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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<li class="chapter " data-level="3.4.1" data-path="../developer/security/userpass.html">
<a href="../developer/security/userpass.html">
Authenticating with a User and Password
</a>
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<li class="chapter " data-level="3.4.2" data-path="../developer/security/token.html">
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Authenticating with a Token
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<li class="chapter " data-level="3.4.3" data-path="../developer/security/nkey.html">
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Authenticating with an NKey
</a>
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Authenticating with a Credentials File
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<li class="chapter " data-level="3.4.5" data-path="../developer/security/tls.html">
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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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<li class="chapter " data-level="3.5.5" data-path="../developer/receiving/reply.html">
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Replying to a Message
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<li class="chapter " data-level="3.5.6" data-path="../developer/receiving/wildcards.html">
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Wildcard Subscriptions
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Queue Subscriptions
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<li class="chapter " data-level="3.5.8" data-path="../developer/receiving/drain.html">
<a href="../developer/receiving/drain.html">
Draining Messages Before Disconnect
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<li class="chapter " data-level="3.5.9" data-path="../developer/receiving/structure.html">
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Structured Data
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<li class="chapter " data-level="3.6" data-path="../developer/sending/intro.html">
<a href="../developer/sending/intro.html">
Sending Messages
</a>
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<li class="chapter " data-level="3.6.1" data-path="../developer/sending/replyto.html">
<a href="../developer/sending/replyto.html">
Including a Reply Subject
</a>
</li>
<li class="chapter " data-level="3.6.2" data-path="../developer/sending/request_reply.html">
<a href="../developer/sending/request_reply.html">
Request-Reply Semantics
</a>
</li>
<li class="chapter " data-level="3.6.3" data-path="../developer/sending/caches.html">
<a href="../developer/sending/caches.html">
Caches, Flush and Ping
</a>
</li>
<li class="chapter " data-level="3.6.4" data-path="../developer/sending/structure.html">
<a href="../developer/sending/structure.html">
Sending Structured Data
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="3.7" data-path="../developer/events/intro.html">
<a href="../developer/events/intro.html">
Monitoring the Connection
</a>
<ul class="articles">
<li class="chapter " data-level="3.7.1" data-path="../developer/events/events.html">
<a href="../developer/events/events.html">
Listen for Connection Events
</a>
</li>
<li class="chapter " data-level="3.7.2" data-path="../developer/events/slow.html">
<a href="../developer/events/slow.html">
Slow Consumers
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</ul>
</li>
<li class="chapter " data-level="3.8" data-path="../developer/tutorials/intro.html">
<a href="../developer/tutorials/intro.html">
Tutorials
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<ul class="articles">
<li class="chapter " data-level="3.8.1" data-path="../developer/tutorials/pubsub.html">
<a href="../developer/tutorials/pubsub.html">
Explore NATS Pub/Sub
</a>
</li>
<li class="chapter " data-level="3.8.2" data-path="../developer/tutorials/reqreply.html">
<a href="../developer/tutorials/reqreply.html">
Explore NATS Request/Reply
</a>
</li>
<li class="chapter " data-level="3.8.3" data-path="../developer/tutorials/queues.html">
<a href="../developer/tutorials/queues.html">
Explore NATS Queueing
</a>
</li>
<li class="chapter " data-level="3.8.4" data-path="../developer/tutorials/custom_dialer.html">
<a href="../developer/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">
<a href="../nats_server/installation.html">
Installing
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<li class="chapter " data-level="4.2" data-path="../nats_server/running.html">
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Running
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<ul class="articles">
<li class="chapter " data-level="4.2.1" data-path="../nats_server/windows_srv.html">
<a href="../nats_server/windows_srv.html">
Window Service
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="4.3" data-path="../nats_server/clients.html">
<a href="../nats_server/clients.html">
Clients
</a>
</li>
<li class="chapter " data-level="4.4" data-path="../nats_server/flags.html">
<a href="../nats_server/flags.html">
Flags
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<li class="chapter " data-level="4.5" data-path="../nats_server/configuration.html">
<a href="../nats_server/configuration.html">
Configuration
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<a href="../nats_server/securing_nats.html">
Securing NATS
</a>
<ul class="articles">
<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>
<ul class="articles">
<li class="chapter " data-level="4.5.1.2.1" data-path="../nats_server/tokens.html">
<a href="../nats_server/tokens.html">
Tokens
</a>
</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>
<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/dir_store.html">
<a href="../nats_tools/nas/dir_store.html">
Directory Store
</a>
</li>
<li class="chapter " data-level="5.4.4" data-path="../nats_tools/nas/notifications.html">
<a href="../nats_tools/nas/notifications.html">
Update Notifications
</a>
</li>
<li class="chapter " data-level="5.4.5" 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/nats-top-tutorial.html">
<a href="../nats_tools/nats_top/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="intro.html">
<a href="intro.html">
Introduction
</a>
</li>
<li class="chapter " data-level="6.2" data-path="relation-to-nats.html">
<a href="relation-to-nats.html">
Relation to NATS
</a>
</li>
<li class="chapter " data-level="6.3" data-path="client-connections.html">
<a href="client-connections.html">
Client Connections
</a>
</li>
<li class="chapter " data-level="6.4" data-path="channels/channels.html">
<a href="channels/channels.html">
Channels
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<ul class="articles">
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Store Interface
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Store Encryption
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TLS
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Windows Service
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Docker Swarm
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Protocol Demo
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Client Protocol
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Developing a Client
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NATS Cluster Protocol
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<h1 id="store-interface"><a name="store-interface" class="plugin-anchor" href="#store-interface"><i class="fa fa-link" aria-hidden="true"></i></a>Store Interface</h1>
<p>Every store implementation follows the <a href="https://github.com/nats-io/nats-streaming-server/blob/master/stores/store.go" target="_blank">Store interface</a>.</p>
<p>On startup, the server creates a unique instance of the <code>Store</code>. The constructor of a store implementation can do some initialization and configuration check, but <em>must not</em> access, or attempt to recover, the storage at this point. This is important because when the server runs on Fault Tolerance mode, the storage must be shared across many servers but only one server can be using it.</p>
<p>After instantiating the store, the server will then call <code>Recover()</code> in order to recover the persisted state. For implementations that do not support persistence, such as the provided <code>MemoryStore</code>, this call will simply return <code>nil</code> (without error) to indicate that no state was recovered.</p>
<p>The <code>Store</code> is used to add/delete clients, create/lookup channels, etc...</p>
<p>Creating/looking up a channel will return a <code>ChannelStore</code>, which points to two other interfaces, the <code>SubStore</code> and <code>MsgStore</code>. These stores, for a given channel, handle subscriptions and messages respectively.</p>
<p>If you wish to contribute to a new store type, your implementation must include all these interfaces. For stores that allow recovery (such as file store as opposed to memory store), there are additional structures that have been defined and should be returned by <code>Recover()</code>.</p>
<p>The memory and the provided file store implementations both use a generic store implementation to avoid code duplication. When writing your own store implementation, you can do the same for APIs that don&apos;t need to do more than what the generic implementation provides. You can check <a href="https://github.com/nats-io/nats-streaming-server/blob/master/stores/memstore.go" target="_blank">MemStore</a> and <a href="https://github.com/nats-io/nats-streaming-server/blob/master/stores/filestore.go" target="_blank">FileStore</a> implementations for more details.</p>
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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>
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