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660 lines
26 KiB
HTML
660 lines
26 KiB
HTML
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<meta charset="utf-8">
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<h1 id="toc_0">WS-API: VariableServer</h1>
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<p><code>ws://localhost:8888/api/ws/VariableServer</code></p>
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<h2 id="toc_1">Purpose</h2>
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<p>JSON Variable Server</p>
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<h2 id="toc_2">Client to Server Command Messages</h2>
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<p>Add a Trick Variable to the current session.</p>
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<div><pre><code class="language-javascript">{ "cmd" : "var_add",
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"var_name" : string
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}</code></pre></div>
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<p>Stop sending periodic <code>var_list</code> messages (<em>see below</em>) from the server.</p>
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<div><pre><code class="language-javascript">{ "cmd" : "var_pause" }</code></pre></div>
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<p>Resume sending periodic <code>var_list</code> response messages from the server.</p>
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<div><pre><code class="language-javascript">{ "cmd" : "var_unpause" }
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</code></pre></div>
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<p>Send one <code>var_list</code> message from the server.</p>
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<div><pre><code class="language-javascript">{ "cmd" : "var_send" }</code></pre></div>
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<p>Clear all variables from the current session, that is: undo all of the <code>var_add</code> commands.</p>
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<div><pre><code class="language-javascript">{ "cmd" : "var_clear" }</code></pre></div>
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<p>Disconnect from the variable server.</p>
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<div><pre><code class="language-javascript">{ "cmd" : "var_exit" }</code></pre></div>
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<p>Set the period (in milliseconds) at which <code>var_list</code> messages are sent form the server.</p>
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<div><pre><code class="language-javascript">{ "cmd" : "var_cycle",
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"period" : integer
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}</code></pre></div>
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<p>Execute the given Python code in the host sim. </p>
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<div><pre><code class="language-javascript">{ "cmd" : "python",
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"pycode" : string
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}</code></pre></div>
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<p>Send the sie structure from the server. Response will be the <code>sie</code> response message (<em>below</em>).</p>
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<div><pre><code class="language-javascript">{ "cmd" : "sie" }</code></pre></div>
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<p>Send the units for the given variable. Response will be the <code>units</code> response message (<em>below</em>).</p>
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<div><pre><code class="language-javascript">{ "cmd" : "units",
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"var_name" : string
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}</code></pre></div>
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<h2 id="toc_3">Server to Client Response Messages</h2>
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<p>Error Response</p>
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<div><pre><code class="language-javascript">{ "msg_type" : "error",
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"error_text" : string
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}</code></pre></div>
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<p>Periodic response containing the values of variables requested by <code>var_add</code>. </p>
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<div><pre><code class="language-javascript">{ "msg_type" : "var_list"
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"time" : double
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"values" : []
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}</code></pre></div>
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<p>Response to the <code>sie</code> command (<em>above</em>).</p>
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<div><pre><code class="language-javascript">{ "msg_type" : "sie",
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"data" : string
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}</code></pre></div>
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<p>Response to the <code>units</code> command (<em>above</em>).</p>
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<div><pre><code class="language-javascript">{ "msg_type" : "units",
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"var_name" : string,
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"data" : string
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}</code></pre></div>
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<h2 id="toc_4">Example Variable Server Client</h2>
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<div><pre><code class="language-markup"><!DOCTYPE html>
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<html>
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|
<head>
|
|
<title>WS Experiments</title>
|
|
</head>
|
|
<body>
|
|
<style>
|
|
table { border-collapse: collapse; width: 100%; }
|
|
th, td { text-align: left; padding: 8px; }
|
|
tr:nth-child(even){background-color: #f2f2f2}
|
|
th { background-color: #562399; color: white; }
|
|
</style>
|
|
<header>
|
|
</header>
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|
|
<div class="variableDisplay"></div>
|
|
<table class="variables">
|
|
<tr>
|
|
<th>Variable</th>
|
|
<th>Value</th>
|
|
</tr>
|
|
</table>
|
|
|
|
<div id="output"></div>
|
|
<script type="text/javascript">
|
|
function log(s) {
|
|
var p = document.createElement("p");
|
|
p.style.wordWrap = "break-word";
|
|
p.textContent = s;
|
|
output.appendChild(p);
|
|
}
|
|
function sendMessage(msg) {
|
|
ws.send(msg);
|
|
}
|
|
// Interface to Trick WebSocket Variable Server
|
|
function setPeriod(period) {
|
|
sendMessage(`{"cmd":"var_cycle","period":${period}}`);
|
|
}
|
|
function addVarTableRow(name, value) {
|
|
// create a row in the table that contains two <td>s, one for the var_name and one for its value.
|
|
let tr = document.createElement('tr');
|
|
let td1 = document.createElement('td');
|
|
td1.textContent = `${name}`;
|
|
let td2 = document.createElement('td');
|
|
td2.textContent = `${value}`;
|
|
td2.className = "values";
|
|
tr.appendChild(td1);
|
|
tr.appendChild(td2);
|
|
varTable.appendChild(tr);
|
|
}
|
|
function addVariable(name, value) {
|
|
sendMessage(`{"cmd":"var_add","var_name": "${name}"}`);
|
|
addVarTableRow(name, value);
|
|
}
|
|
var varTable = document.querySelector('table.variables');
|
|
|
|
|
|
var ws = new WebSocket('ws://localhost:8888/api/ws/VariableServer');
|
|
ws.onopen = function(e) {
|
|
setPeriod(100);
|
|
addVarTableRow("Time", 0.0);
|
|
addVariable("dyn.cannon.pos[0]", 0.0);
|
|
addVariable("dyn.cannon.pos[1]", 0.0);
|
|
addVariable("dyn.cannon.vel[0]", 0.0);
|
|
addVariable("dyn.cannon.vel[1]", 0.0);
|
|
addVariable("dyn.cannon.time", 0.0);
|
|
addVariable("dyn.cannon.timeRate", 0.0);
|
|
addVariable("dyn.cannon.impact", 0.0);
|
|
addVariable("I.dont.exist", 0.0);
|
|
sendMessage("{\"cmd\":\"var_unpause\"}");
|
|
};
|
|
ws.onmessage = function(e) {
|
|
let msg = JSON.parse(e.data);
|
|
if (msg.msg_type == "values") {
|
|
let valueNodes = varTable.getElementsByClassName("values");
|
|
valueNodes[0].textContent = msg.time;
|
|
for (let i = 0; i < msg.values.length; i++ ) {
|
|
valueNodes[i+1].textContent = msg.values[i];
|
|
}
|
|
}
|
|
};
|
|
ws.onerror = function(e) {
|
|
console.log("WebSocket Error: " , e);
|
|
handleErrors(e);
|
|
};
|
|
ws.onclose = function(e) {
|
|
console.log("Connection closed", e);
|
|
};
|
|
|
|
</script>
|
|
</body>
|
|
</html></code></pre></div>
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