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<title>Cobra - IXWebSocket</title>
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<h2 id="general">General</h2>
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<p><a href="https://github.com/machinezone/cobra">cobra</a> is a real time messaging server. The <code>ws</code> utility can run a cobra server (named snake), and has client to publish and subscribe to a cobra server.</p>
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<p>Bring up 3 terminals and run a server, a publisher and a subscriber in each one. As you publish data you should see it being received by the subscriber. You can run <code>redis-cli MONITOR</code> too to see how redis is being used.</p>
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<h3 id="server">Server</h3>
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<p>You will need to have a redis server running locally. To run the server:</p>
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<pre><code class="language-bash">$ cd <ixwebsocket-top-level-folder>/ixsnake/ixsnake
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$ ws snake
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{
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"apps": {
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"FC2F10139A2BAc53BB72D9db967b024f": {
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"roles": {
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"_sub": {
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"secret": "66B1dA3ED5fA074EB5AE84Dd8CE3b5ba"
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},
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"_pub": {
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"secret": "1c04DB8fFe76A4EeFE3E318C72d771db"
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}
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}
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}
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}
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}
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redis host: 127.0.0.1
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redis password:
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redis port: 6379
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</code></pre>
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<h3 id="publisher">Publisher</h3>
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<pre><code class="language-bash">$ cd <ixwebsocket-top-level-folder>/ws
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$ ws cobra_publish --appkey FC2F10139A2BAc53BB72D9db967b024f --endpoint ws://127.0.0.1:8008 --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db test_channel cobraMetricsSample.json
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[2019-11-27 09:06:12.980] [info] Publisher connected
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[2019-11-27 09:06:12.980] [info] Connection: Upgrade
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[2019-11-27 09:06:12.980] [info] Sec-WebSocket-Accept: zTtQKMKbvwjdivURplYXwCVUCWM=
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[2019-11-27 09:06:12.980] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15
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[2019-11-27 09:06:12.980] [info] Server: ixwebsocket/7.4.0 macos ssl/DarwinSSL zlib 1.2.11
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[2019-11-27 09:06:12.980] [info] Upgrade: websocket
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[2019-11-27 09:06:12.982] [info] Publisher authenticated
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[2019-11-27 09:06:12.982] [info] Published msg 3
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[2019-11-27 09:06:12.982] [info] Published message id 3 acked
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</code></pre>
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<h3 id="subscriber">Subscriber</h3>
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<pre><code class="language-bash">$ ws cobra_subscribe --appkey FC2F10139A2BAc53BB72D9db967b024f --endpoint ws://127.0.0.1:8008 --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db test_channel
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#messages 0 msg/s 0
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[2019-11-27 09:07:39.341] [info] Subscriber connected
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[2019-11-27 09:07:39.341] [info] Connection: Upgrade
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[2019-11-27 09:07:39.341] [info] Sec-WebSocket-Accept: 9vkQWofz49qMCUlTSptCCwHWm+Q=
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[2019-11-27 09:07:39.341] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15
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[2019-11-27 09:07:39.341] [info] Server: ixwebsocket/7.4.0 macos ssl/DarwinSSL zlib 1.2.11
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[2019-11-27 09:07:39.341] [info] Upgrade: websocket
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[2019-11-27 09:07:39.342] [info] Subscriber authenticated
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[2019-11-27 09:07:39.345] [info] Subscriber: subscribed to channel test_channel
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#messages 0 msg/s 0
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#messages 0 msg/s 0
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#messages 0 msg/s 0
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{"baz":123,"foo":"bar"}
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#messages 1 msg/s 1
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#messages 1 msg/s 0
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#messages 1 msg/s 0
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{"baz":123,"foo":"bar"}
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{"baz":123,"foo":"bar"}
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#messages 3 msg/s 2
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#messages 3 msg/s 0
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{"baz":123,"foo":"bar"}
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#messages 4 msg/s 1
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^C
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</code></pre></div>
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{"config":{"lang":["en"],"min_search_length":3,"prebuild_index":false,"separator":"[\\s\\-]+"},"docs":[{"location":"","text":"Introduction WebSocket is a computer communications protocol, providing full-duplex and bi-directionnal communication channels over a single TCP connection. IXWebSocket is a C++ library for client and server Websocket communication, and for client and server HTTP communication. TLS aka SSL is supported. The code is derived from easywsclient and from the Satori C SDK . It has been tested on the following platforms. macOS iOS Linux Android Windows FreeBSD Example code // Required on Windows ix::initNetSystem(); // Our websocket object ix::WebSocket webSocket; std::string url(\"ws://localhost:8080/\"); webSocket.setUrl(url); // Setup a callback to be fired when a message or an event (open, close, error) is received webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Message) { std::cout << msg->str << std::endl; } } ); // Now that our callback is setup, we can start our background thread and receive messages webSocket.start(); // Send a message to the server (default to TEXT mode) webSocket.send(\"hello world\"); Why another library? There are 2 main reasons that explain why IXWebSocket got written. First, we needed a C++ cross-platform client library, which should have few dependencies. What looked like the most solid one, websocketpp did depend on boost and this was not an option for us. Secondly, there were other available libraries with fewer dependencies (C ones), but they required calling an explicit poll routine periodically to know if a client had received data from a server, which was not elegant. We started by solving those 2 problems, then we added server websocket code, then an HTTP client, and finally a very simple HTTP server. IXWebSocket comes with a command line utility named ws which is quite handy, and is now packaged with alpine linux. You can install it with apk add ws . Few dependencies (only zlib) Simple to use ; uses std::string and std::function callbacks. Complete support of the websocket protocol, and basic http support. Client and Server TLS support Alternative libraries There are plenty of great websocket libraries out there, which might work for you. Here are a couple of serious ones. websocketpp - C++ beast - C++ libwebsockets - C \u00b5WebSockets - C Contributing IXWebSocket is developed on GitHub . We'd love to hear about how you use it; opening up an issue on GitHub is ok for that. If things don't work as expected, please create an issue on GitHub, or even better a pull request if you know how to fix your problem.","title":"Home"},{"location":"#introduction","text":"WebSocket is a computer communications protocol, providing full-duplex and bi-directionnal communication channels over a single TCP connection. IXWebSocket is a C++ library for client and server Websocket communication, and for client and server HTTP communication. TLS aka SSL is supported. The code is derived from easywsclient and from the Satori C SDK . It has been tested on the following platforms. macOS iOS Linux Android Windows FreeBSD","title":"Introduction"},{"location":"#example-code","text":"// Required on Windows ix::initNetSystem(); // Our websocket object ix::WebSocket webSocket; std::string url(\"ws://localhost:8080/\"); webSocket.setUrl(url); // Setup a callback to be fired when a message or an event (open, close, error) is received webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Message) { std::cout << msg->str << std::endl; } } ); // Now that our callback is setup, we can start our background thread and receive messages webSocket.start(); // Send a message to the server (default to TEXT mode) webSocket.send(\"hello world\");","title":"Example code"},{"location":"#why-another-library","text":"There are 2 main reasons that explain why IXWebSocket got written. First, we needed a C++ cross-platform client library, which should have few dependencies. What looked like the most solid one, websocketpp did depend on boost and this was not an option for us. Secondly, there were other available libraries with fewer dependencies (C ones), but they required calling an explicit poll routine periodically to know if a client had received data from a server, which was not elegant. We started by solving those 2 problems, then we added server websocket code, then an HTTP client, and finally a very simple HTTP server. IXWebSocket comes with a command line utility named ws which is quite handy, and is now packaged with alpine linux. You can install it with apk add ws . Few dependencies (only zlib) Simple to use ; uses std::string and std::function callbacks. Complete support of the websocket protocol, and basic http support. Client and Server TLS support","title":"Why another library?"},{"location":"#alternative-libraries","text":"There are plenty of great websocket liLine truncated
|
||||
{"config":{"lang":["en"],"min_search_length":3,"prebuild_index":false,"separator":"[\\s\\-]+"},"docs":[{"location":"","text":"Introduction WebSocket is a computer communications protocol, providing full-duplex and bi-directionnal communication channels over a single TCP connection. IXWebSocket is a C++ library for client and server Websocket communication, and for client and server HTTP communication. TLS aka SSL is supported. The code is derived from easywsclient and from the Satori C SDK . It has been tested on the following platforms. macOS iOS Linux Android Windows FreeBSD Example code // Required on Windows ix::initNetSystem(); // Our websocket object ix::WebSocket webSocket; std::string url(\"ws://localhost:8080/\"); webSocket.setUrl(url); // Setup a callback to be fired when a message or an event (open, close, error) is received webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Message) { std::cout << msg->str << std::endl; } } ); // Now that our callback is setup, we can start our background thread and receive messages webSocket.start(); // Send a message to the server (default to TEXT mode) webSocket.send(\"hello world\"); Why another library? There are 2 main reasons that explain why IXWebSocket got written. First, we needed a C++ cross-platform client library, which should have few dependencies. What looked like the most solid one, websocketpp did depend on boost and this was not an option for us. Secondly, there were other available libraries with fewer dependencies (C ones), but they required calling an explicit poll routine periodically to know if a client had received data from a server, which was not elegant. We started by solving those 2 problems, then we added server websocket code, then an HTTP client, and finally a very simple HTTP server. IXWebSocket comes with a command line utility named ws which is quite handy, and is now packaged with alpine linux. You can install it with apk add ws . Few dependencies (only zlib) Simple to use ; uses std::string and std::function callbacks. Complete support of the websocket protocol, and basic http support. Client and Server TLS support Alternative libraries There are plenty of great websocket libraries out there, which might work for you. Here are a couple of serious ones. websocketpp - C++ beast - C++ libwebsockets - C \u00b5WebSockets - C Contributing IXWebSocket is developed on GitHub . We'd love to hear about how you use it; opening up an issue on GitHub is ok for that. If things don't work as expected, please create an issue on GitHub, or even better a pull request if you know how to fix your problem.","title":"Home"},{"location":"#introduction","text":"WebSocket is a computer communications protocol, providing full-duplex and bi-directionnal communication channels over a single TCP connection. IXWebSocket is a C++ library for client and server Websocket communication, and for client and server HTTP communication. TLS aka SSL is supported. The code is derived from easywsclient and from the Satori C SDK . It has been tested on the following platforms. macOS iOS Linux Android Windows FreeBSD","title":"Introduction"},{"location":"#example-code","text":"// Required on Windows ix::initNetSystem(); // Our websocket object ix::WebSocket webSocket; std::string url(\"ws://localhost:8080/\"); webSocket.setUrl(url); // Setup a callback to be fired when a message or an event (open, close, error) is received webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Message) { std::cout << msg->str << std::endl; } } ); // Now that our callback is setup, we can start our background thread and receive messages webSocket.start(); // Send a message to the server (default to TEXT mode) webSocket.send(\"hello world\");","title":"Example code"},{"location":"#why-another-library","text":"There are 2 main reasons that explain why IXWebSocket got written. First, we needed a C++ cross-platform client library, which should have few dependencies. What looked like the most solid one, websocketpp did depend on boost and this was not an option for us. Secondly, there were other available libraries with fewer dependencies (C ones), but they required calling an explicit poll routine periodically to know if a client had received data from a server, which was not elegant. We started by solving those 2 problems, then we added server websocket code, then an HTTP client, and finally a very simple HTTP server. IXWebSocket comes with a command line utility named ws which is quite handy, and is now packaged with alpine linux. You can install it with apk add ws . Few dependencies (only zlib) Simple to use ; uses std::string and std::function callbacks. Complete support of the websocket protocol, and basic http support. Client and Server TLS support","title":"Why another library?"},{"location":"#alternative-libraries","text":"There are plenty of great websocket liLine truncated
|
||||
@@ -31,9 +31,5 @@
|
||||
<loc>None</loc>
|
||||
<lastmod>2020-12-25</lastmod>
|
||||
<changefreq>daily</changefreq>
|
||||
</url><url>
|
||||
<loc>None</loc>
|
||||
<lastmod>2020-12-25</lastmod>
|
||||
<changefreq>daily</changefreq>
|
||||
</url>
|
||||
</urlset>
|
||||
Binary file not shown.
@@ -42,9 +42,6 @@
|
||||
<li class="navitem">
|
||||
<a href="../build/" class="nav-link">Build</a>
|
||||
</li>
|
||||
<li class="navitem">
|
||||
<a href="../cobra/" class="nav-link">Cobra</a>
|
||||
</li>
|
||||
<li class="navitem">
|
||||
<a href="../design/" class="nav-link">Design</a>
|
||||
</li>
|
||||
|
||||
+3
-131
@@ -42,9 +42,6 @@
|
||||
<li class="navitem">
|
||||
<a href="../build/" class="nav-link">Build</a>
|
||||
</li>
|
||||
<li class="navitem">
|
||||
<a href="../cobra/" class="nav-link">Cobra</a>
|
||||
</li>
|
||||
<li class="navitem">
|
||||
<a href="../design/" class="nav-link">Design</a>
|
||||
</li>
|
||||
@@ -130,11 +127,6 @@
|
||||
<ul class="nav flex-column">
|
||||
</ul>
|
||||
</li>
|
||||
|
||||
<li class="nav-item" data-level="2"><a href="#cobra-client-and-server" class="nav-link">Cobra client and server</a>
|
||||
<ul class="nav flex-column">
|
||||
</ul>
|
||||
</li>
|
||||
</ul>
|
||||
</div>
|
||||
</div></div>
|
||||
@@ -158,13 +150,6 @@ Subcommands:
|
||||
broadcast_server Broadcasting server
|
||||
ping Ping pong
|
||||
curl HTTP Client
|
||||
redis_publish Redis publisher
|
||||
redis_subscribe Redis subscriber
|
||||
cobra_subscribe Cobra subscriber
|
||||
cobra_publish Cobra publisher
|
||||
cobra_to_statsd Cobra to statsd
|
||||
cobra_to_sentry Cobra to sentry
|
||||
snake Snake server
|
||||
httpd HTTP server
|
||||
</code></pre>
|
||||
<h2 id="curl">curl</h2>
|
||||
@@ -370,12 +355,8 @@ Listening on 127.0.0.1:8008
|
||||
<p>If you connect to ws://127.0.0.1:8008, the proxy will connect to ws://127.0.0.1:9000 and pass all traffic to this server.</p>
|
||||
<p>You can also use a more complex setup if you want to redirect to different websocket servers based on the hostname your client is trying to connect to. If you have multiple CNAME aliases that point to the same server.</p>
|
||||
<p>A JSON config file is used to express that mapping ; here connecting to echo.jeanserge.com will proxy the client to ws://localhost:8008 on the local machine (which actually runs ws echo_server), while connecting to bavarde.jeanserge.com will proxy the client to ws://localhost:5678 where a cobra python server is running. As a side note you will need a wildcard SSL certificate if you want to have SSL enabled on that machine.</p>
|
||||
<pre><code class="language-json">{
|
||||
"remote_urls": {
|
||||
"echo.jeanserge.com": "ws://localhost:8008",
|
||||
"bavarde.jeanserge.com": "ws://localhost:5678"
|
||||
}
|
||||
}
|
||||
<pre><code>echo.jeanserge.com=ws://localhost:8008
|
||||
bavarde.jeanserge.com=ws://localhost:5678
|
||||
</code></pre>
|
||||
<p>The --config_path option is required to instruct ws proxy_server to read that file.</p>
|
||||
<pre><code>ws proxy_server --config_path proxyConfig.json --port 8765
|
||||
@@ -412,116 +393,7 @@ Options:
|
||||
--compress Enable gzip compression
|
||||
--connect-timeout INT Connection timeout
|
||||
--transfer-timeout INT Transfer timeout
|
||||
</code></pre>
|
||||
<h2 id="cobra-client-and-server">Cobra client and server</h2>
|
||||
<p><a href="https://github.com/machinezone/cobra">cobra</a> is a real time messenging server. ws has several sub-command to interact with cobra. There is also a minimal cobra compatible server named snake available.</p>
|
||||
<p>Below are examples on running a snake server and clients with TLS enabled (the server only works with the OpenSSL and the Mbed TLS backend for now).</p>
|
||||
<p>First, generate certificates.</p>
|
||||
<pre><code>$ cd /path/to/IXWebSocket
|
||||
$ cd ixsnake/ixsnake
|
||||
$ bash ../../ws/generate_certs.sh
|
||||
Generating RSA private key, 2048 bit long modulus
|
||||
.....+++
|
||||
.................+++
|
||||
e is 65537 (0x10001)
|
||||
generated ./.certs/trusted-ca-key.pem
|
||||
generated ./.certs/trusted-ca-crt.pem
|
||||
Generating RSA private key, 2048 bit long modulus
|
||||
..+++
|
||||
.......................................+++
|
||||
e is 65537 (0x10001)
|
||||
generated ./.certs/trusted-server-key.pem
|
||||
Signature ok
|
||||
subject=/O=machinezone/O=IXWebSocket/CN=trusted-server
|
||||
Getting CA Private Key
|
||||
generated ./.certs/trusted-server-crt.pem
|
||||
Generating RSA private key, 2048 bit long modulus
|
||||
...................................+++
|
||||
..................................................+++
|
||||
e is 65537 (0x10001)
|
||||
generated ./.certs/trusted-client-key.pem
|
||||
Signature ok
|
||||
subject=/O=machinezone/O=IXWebSocket/CN=trusted-client
|
||||
Getting CA Private Key
|
||||
generated ./.certs/trusted-client-crt.pem
|
||||
Generating RSA private key, 2048 bit long modulus
|
||||
..............+++
|
||||
.......................................+++
|
||||
e is 65537 (0x10001)
|
||||
generated ./.certs/untrusted-ca-key.pem
|
||||
generated ./.certs/untrusted-ca-crt.pem
|
||||
Generating RSA private key, 2048 bit long modulus
|
||||
..........+++
|
||||
................................................+++
|
||||
e is 65537 (0x10001)
|
||||
generated ./.certs/untrusted-client-key.pem
|
||||
Signature ok
|
||||
subject=/O=machinezone/O=IXWebSocket/CN=untrusted-client
|
||||
Getting CA Private Key
|
||||
generated ./.certs/untrusted-client-crt.pem
|
||||
Generating RSA private key, 2048 bit long modulus
|
||||
.....................................................................................+++
|
||||
...........+++
|
||||
e is 65537 (0x10001)
|
||||
generated ./.certs/selfsigned-client-key.pem
|
||||
Signature ok
|
||||
subject=/O=machinezone/O=IXWebSocket/CN=selfsigned-client
|
||||
Getting Private key
|
||||
generated ./.certs/selfsigned-client-crt.pem
|
||||
</code></pre>
|
||||
<p>Now run the snake server.</p>
|
||||
<pre><code>$ export certs=.certs
|
||||
$ ws snake --tls --port 8765 --cert-file ${certs}/trusted-server-crt.pem --key-file ${certs}/trusted-server-key.pem --ca-file ${certs}/trusted-ca-crt.pem
|
||||
{
|
||||
"apps": {
|
||||
"FC2F10139A2BAc53BB72D9db967b024f": {
|
||||
"roles": {
|
||||
"_sub": {
|
||||
"secret": "66B1dA3ED5fA074EB5AE84Dd8CE3b5ba"
|
||||
},
|
||||
"_pub": {
|
||||
"secret": "1c04DB8fFe76A4EeFE3E318C72d771db"
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
redis host: 127.0.0.1
|
||||
redis password:
|
||||
redis port: 6379
|
||||
</code></pre>
|
||||
<p>As a new connection comes in, such output should be printed</p>
|
||||
<pre><code>[2019-12-19 20:27:19.724] [info] New connection
|
||||
id: 0
|
||||
Uri: /v2?appkey=_health
|
||||
Headers:
|
||||
Connection: Upgrade
|
||||
Host: 127.0.0.1:8765
|
||||
Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15
|
||||
Sec-WebSocket-Key: d747B0fE61Db73f7Eh47c0==
|
||||
Sec-WebSocket-Protocol: json
|
||||
Sec-WebSocket-Version: 13
|
||||
Upgrade: websocket
|
||||
User-Agent: ixwebsocket/7.5.8 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11
|
||||
</code></pre>
|
||||
<p>To connect and publish a message, do:</p>
|
||||
<pre><code>$ export certs=.certs
|
||||
$ cd /path/to/ws/folder
|
||||
$ ls cobraMetricsSample.json
|
||||
cobraMetricsSample.json
|
||||
$ ws cobra_publish --endpoint wss://127.0.0.1:8765 --appkey FC2F10139A2BAc53BB72D9db967b024f --rolename _pub --rolesecret 1c04DB8fFe76A4EeFE3E318C72d771db --channel foo --cert-file ${certs}/trusted-client-crt.pem --key-file ${certs}/trusted-client-key.pem --ca-file ${certs}/trusted-ca-crt.pem cobraMetricsSample.json
|
||||
[2019-12-19 20:46:42.656] [info] Publisher connected
|
||||
[2019-12-19 20:46:42.657] [info] Connection: Upgrade
|
||||
[2019-12-19 20:46:42.657] [info] Sec-WebSocket-Accept: rs99IFThoBrhSg+k8G4ixH9yaq4=
|
||||
[2019-12-19 20:46:42.657] [info] Sec-WebSocket-Extensions: permessage-deflate; server_max_window_bits=15; client_max_window_bits=15
|
||||
[2019-12-19 20:46:42.657] [info] Server: ixwebsocket/7.5.8 macos ssl/OpenSSL OpenSSL 1.0.2q 20 Nov 2018 zlib 1.2.11
|
||||
[2019-12-19 20:46:42.657] [info] Upgrade: websocket
|
||||
[2019-12-19 20:46:42.658] [info] Publisher authenticated
|
||||
[2019-12-19 20:46:42.658] [info] Published msg 3
|
||||
[2019-12-19 20:46:42.659] [info] Published message id 3 acked
|
||||
</code></pre>
|
||||
<p>To use OpenSSL on macOS, compile with <code>make ws_openssl</code>. First you will have to install OpenSSL libraries, which can be done with Homebrew. Use <code>make ws_mbedtls</code> accordingly to use MbedTLS.</p></div>
|
||||
</code></pre></div>
|
||||
</div>
|
||||
</div>
|
||||
|
||||
|
||||
Reference in new issue
Block a user