A push notification micro server using Gin framework written in Go (Golang).

<ul>
<li>Support <a href="https://firebase.google.com/docs/cloud-messaging">Firebase Cloud Messaging</a> using <a href="https://github.com/appleboy/go-fcm">go-fcm</a> library for Android.</li>
<li>Support <a href="https://http2.github.io/">HTTP/2</a> Apple Push Notification Service using <a href="https://github.com/sideshow/apns2">apns2</a> library.</li>
<li>Support <a href="https://github.com/go-yaml/yaml">YAML</a> configuration.</li>
<li>Support command line to send single Android or iOS notification.</li>
<li>Support Web API to send push notification.</li>
<li>Support graceful restart &amp; zero downtime deploy using <a href="https://github.com/facebookgo/grace">facebook grace</a>.</li>
<li>Support <a href="https://http2.github.io/">HTTP/2</a> or HTTP/1.1 protocol.</li>
<li>Support notification queue and multiple workers.</li>
<li>Support <code>/api/stat/app</code> show notification success and failure counts.</li>
<li>Support <code>/api/config</code> show your <a href="https://en.wikipedia.org/wiki/YAML">YAML</a> config.</li>
<li>Support store app stat to memory, <a href="http://redis.io/">Redis</a>, <a href="https://github.com/boltdb/bolt">BoltDB</a>, <a href="https://github.com/tidwall/buntdb">BuntDB</a> or <a href="https://github.com/syndtr/goleveldb">LevelDB</a>.</li>
<li>Support <code>p12</code> or <code>pem</code> formtat of iOS certificate file.</li>
<li>Support <code>/sys/stats</code> show response time, status code count, etc.</li>
<li>Support for HTTP proxy to Google server (FCM).</li>
<li>Support retry send notification if server response is fail.</li>
<li>Support expose <a href="https://prometheus.io/">prometheus</a> metrics.</li>
<li>Support install TLS certificates from <a href="https://letsencrypt.org/">Let's Encrypt</a> automatically.</li>
<li>Support send notification through <a href="https://en.wikipedia.org/wiki/Remote_procedure_call">RPC</a> protocol, we use <a href="https://grpc.io/">gRPC</a> as default framework.</li>
</ul>

A push notification micro server using Gin framework written in Go (Golang).

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<ul>
 <li>support distributed topologies with no SPOF</li>
 <li>horizontally scalable (no brokers, seamlessly add more nodes to the cluster)</li>
 <li>low-latency push based message delivery </li>
 <li>combination load-balanced and multicast style message routing</li>
 <li>excel at both streaming (high-throughput) and job oriented (low-throughput) workloads</li>
 <li>primarily in-memory (beyond a high-water mark messages are transparently kept on disk)</li>
 <li>runtime discovery service for consumers to find producers</li>
 <li>transport layer security (TLS)</li>
 <li>data format agnostic</li>
 <li>few dependencies (easy to deploy) and a sane, bounded, default configuration</li>
 <li>simple TCP protocol supporting client libraries in any language</li>
 <li>HTTP interface for stats, admin actions, and producers (no client library needed to publish)</li>
 <li>integrates with statsd for realtime instrumentation</li>
 <li>robust cluster administration interface</li>
</ul>

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