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245 lines
12 KiB
HTML
245 lines
12 KiB
HTML
<!DOCTYPE HTML>
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<html lang="en" class="light sidebar-visible" dir="ltr">
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<head>
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<!-- Book generated using mdBook -->
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<meta charset="UTF-8">
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<title>Messaging - ctrl</title>
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<meta name="description" content="">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="icon" href="favicon.svg">
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<link rel="shortcut icon" href="favicon.png">
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<link rel="stylesheet" href="css/variables.css">
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<body>
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<div id="body-container">
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<script>
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var sidebar = localStorage.getItem('mdbook-sidebar');
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<div class="page">
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<div id="menu-bar" class="menu-bar sticky">
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</div>
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<h1 class="menu-title">ctrl</h1>
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<div class="right-buttons">
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<a href="print.html" title="Print this book" aria-label="Print this book">
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<i id="print-button" class="fa fa-print"></i>
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</div>
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</div>
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<div id="search-wrapper" class="hidden">
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<form id="searchbar-outer" class="searchbar-outer">
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<input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
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</form>
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<div id="searchresults-outer" class="searchresults-outer hidden">
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<div id="searchresults-header" class="searchresults-header"></div>
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<ul id="searchresults">
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</ul>
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</div>
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</div>
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<script>
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document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
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document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
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Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
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link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
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});
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</script>
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<div id="content" class="content">
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<main>
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<h1 id="messaging"><a class="header" href="#messaging">Messaging</a></h1>
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<p>The handling of all messages is done by spawning up a process for handling the message in it's own thread. This allows us to keep the state of each <strong>individual message level</strong> both in regards to ACK's, error handling, send retries, and reruns of methods for a message if the first run was not successful.</p>
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<p>All messages processed by a publisher will be written to a log file after they are processed, with all the information needed to recreate the same message if needed, or it can be used for auditing.</p>
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<p>All handling down to the process and message level are handled concurrently. So if there are problems handling one message sent to a node on a subject it will not affect the messages being sent to other nodes, or other messages sent on other subjects to the same host.</p>
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<p>Message types of both <strong>ACK</strong> and <strong>NACK</strong>, so we can decide if we want or don't want an Acknowledge if a message was delivered succesfully.
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Example: We probably want an <strong>ACK</strong> when sending some <strong>REQCLICommand</strong> to be executed, but we don't care for an acknowledge <strong>NACK</strong> when we send an <strong>REQHello</strong> event.
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If a message are <strong>ACK</strong> or <strong>NACK</strong> type are defined by the value of the <strong>ACKTimeout</strong> for each individual message:</p>
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<ul>
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<li><strong>ACKTimeout</strong> set to 0 will make the message become a <strong>NACK</strong> message.</li>
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<li><strong>ACKTimeout</strong> set to >=1 will make the message become an <strong>ACK</strong> message.</li>
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</ul>
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<p>If ACK is expected, and not received, then the message will be retried the amount of time defined in the <strong>retries</strong> field of a message. If numer of retries are reached, and still no ACK received, the message will be discared, and a log message will be sent to the log server.</p>
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<p>To make things easier, all timeouts used for messages can be set with env variables or flags at startup of ctrl. Locally specified timeout directly in a message will override the startup values, and can be used for more granularity when needed.</p>
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<h2 id="example-of-message-flow"><a class="header" href="#example-of-message-flow">Example of message flow:</a></h2>
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<style>
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img {
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background-color: #FFFFFF;
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}
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</style>
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</head>
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<body>
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<p align="center"><img src="https://github.com/postmannen/ctrl/blob/main/doc/message-flow.svg?raw=true" /></p>
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</body>
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</main>
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