stdioTransport.ts.htmlā¢19.6 kB
<!doctype html>
<html lang="en">
<head>
<title>Code coverage report for src/mcp-server/transports/stdio/stdioTransport.ts</title>
<meta charset="utf-8" />
<link rel="stylesheet" href="../../../../prettify.css" />
<link rel="stylesheet" href="../../../../base.css" />
<link rel="shortcut icon" type="image/x-icon" href="../../../../favicon.png" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style type='text/css'>
.coverage-summary .sorter {
background-image: url(../../../../sort-arrow-sprite.png);
}
</style>
</head>
<body>
<div class='wrapper'>
<div class='pad1'>
<h1><a href="../../../../index.html">All files</a> / <a href="index.html">src/mcp-server/transports/stdio</a> stdioTransport.ts</h1>
<div class='clearfix'>
<div class='fl pad1y space-right2'>
<span class="strong">5.66% </span>
<span class="quiet">Statements</span>
<span class='fraction'>3/53</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">100% </span>
<span class="quiet">Branches</span>
<span class='fraction'>0/0</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">0% </span>
<span class="quiet">Functions</span>
<span class='fraction'>0/2</span>
</div>
<div class='fl pad1y space-right2'>
<span class="strong">5.66% </span>
<span class="quiet">Lines</span>
<span class='fraction'>3/53</span>
</div>
</div>
<p class="quiet">
Press <em>n</em> or <em>j</em> to go to the next uncovered block, <em>b</em>, <em>p</em> or <em>k</em> for the previous block.
</p>
<template id="filterTemplate">
<div class="quiet">
Filter:
<input type="search" id="fileSearch">
</div>
</template>
</div>
<div class='status-line low'></div>
<pre><table class="coverage">
<tr><td class="line-count quiet"><a name='L1'></a><a href='#L1'>1</a>
<a name='L2'></a><a href='#L2'>2</a>
<a name='L3'></a><a href='#L3'>3</a>
<a name='L4'></a><a href='#L4'>4</a>
<a name='L5'></a><a href='#L5'>5</a>
<a name='L6'></a><a href='#L6'>6</a>
<a name='L7'></a><a href='#L7'>7</a>
<a name='L8'></a><a href='#L8'>8</a>
<a name='L9'></a><a href='#L9'>9</a>
<a name='L10'></a><a href='#L10'>10</a>
<a name='L11'></a><a href='#L11'>11</a>
<a name='L12'></a><a href='#L12'>12</a>
<a name='L13'></a><a href='#L13'>13</a>
<a name='L14'></a><a href='#L14'>14</a>
<a name='L15'></a><a href='#L15'>15</a>
<a name='L16'></a><a href='#L16'>16</a>
<a name='L17'></a><a href='#L17'>17</a>
<a name='L18'></a><a href='#L18'>18</a>
<a name='L19'></a><a href='#L19'>19</a>
<a name='L20'></a><a href='#L20'>20</a>
<a name='L21'></a><a href='#L21'>21</a>
<a name='L22'></a><a href='#L22'>22</a>
<a name='L23'></a><a href='#L23'>23</a>
<a name='L24'></a><a href='#L24'>24</a>
<a name='L25'></a><a href='#L25'>25</a>
<a name='L26'></a><a href='#L26'>26</a>
<a name='L27'></a><a href='#L27'>27</a>
<a name='L28'></a><a href='#L28'>28</a>
<a name='L29'></a><a href='#L29'>29</a>
<a name='L30'></a><a href='#L30'>30</a>
<a name='L31'></a><a href='#L31'>31</a>
<a name='L32'></a><a href='#L32'>32</a>
<a name='L33'></a><a href='#L33'>33</a>
<a name='L34'></a><a href='#L34'>34</a>
<a name='L35'></a><a href='#L35'>35</a>
<a name='L36'></a><a href='#L36'>36</a>
<a name='L37'></a><a href='#L37'>37</a>
<a name='L38'></a><a href='#L38'>38</a>
<a name='L39'></a><a href='#L39'>39</a>
<a name='L40'></a><a href='#L40'>40</a>
<a name='L41'></a><a href='#L41'>41</a>
<a name='L42'></a><a href='#L42'>42</a>
<a name='L43'></a><a href='#L43'>43</a>
<a name='L44'></a><a href='#L44'>44</a>
<a name='L45'></a><a href='#L45'>45</a>
<a name='L46'></a><a href='#L46'>46</a>
<a name='L47'></a><a href='#L47'>47</a>
<a name='L48'></a><a href='#L48'>48</a>
<a name='L49'></a><a href='#L49'>49</a>
<a name='L50'></a><a href='#L50'>50</a>
<a name='L51'></a><a href='#L51'>51</a>
<a name='L52'></a><a href='#L52'>52</a>
<a name='L53'></a><a href='#L53'>53</a>
<a name='L54'></a><a href='#L54'>54</a>
<a name='L55'></a><a href='#L55'>55</a>
<a name='L56'></a><a href='#L56'>56</a>
<a name='L57'></a><a href='#L57'>57</a>
<a name='L58'></a><a href='#L58'>58</a>
<a name='L59'></a><a href='#L59'>59</a>
<a name='L60'></a><a href='#L60'>60</a>
<a name='L61'></a><a href='#L61'>61</a>
<a name='L62'></a><a href='#L62'>62</a>
<a name='L63'></a><a href='#L63'>63</a>
<a name='L64'></a><a href='#L64'>64</a>
<a name='L65'></a><a href='#L65'>65</a>
<a name='L66'></a><a href='#L66'>66</a>
<a name='L67'></a><a href='#L67'>67</a>
<a name='L68'></a><a href='#L68'>68</a>
<a name='L69'></a><a href='#L69'>69</a>
<a name='L70'></a><a href='#L70'>70</a>
<a name='L71'></a><a href='#L71'>71</a>
<a name='L72'></a><a href='#L72'>72</a>
<a name='L73'></a><a href='#L73'>73</a>
<a name='L74'></a><a href='#L74'>74</a>
<a name='L75'></a><a href='#L75'>75</a>
<a name='L76'></a><a href='#L76'>76</a>
<a name='L77'></a><a href='#L77'>77</a>
<a name='L78'></a><a href='#L78'>78</a>
<a name='L79'></a><a href='#L79'>79</a>
<a name='L80'></a><a href='#L80'>80</a>
<a name='L81'></a><a href='#L81'>81</a>
<a name='L82'></a><a href='#L82'>82</a>
<a name='L83'></a><a href='#L83'>83</a>
<a name='L84'></a><a href='#L84'>84</a>
<a name='L85'></a><a href='#L85'>85</a>
<a name='L86'></a><a href='#L86'>86</a>
<a name='L87'></a><a href='#L87'>87</a>
<a name='L88'></a><a href='#L88'>88</a>
<a name='L89'></a><a href='#L89'>89</a>
<a name='L90'></a><a href='#L90'>90</a>
<a name='L91'></a><a href='#L91'>91</a>
<a name='L92'></a><a href='#L92'>92</a>
<a name='L93'></a><a href='#L93'>93</a>
<a name='L94'></a><a href='#L94'>94</a>
<a name='L95'></a><a href='#L95'>95</a>
<a name='L96'></a><a href='#L96'>96</a>
<a name='L97'></a><a href='#L97'>97</a>
<a name='L98'></a><a href='#L98'>98</a>
<a name='L99'></a><a href='#L99'>99</a>
<a name='L100'></a><a href='#L100'>100</a>
<a name='L101'></a><a href='#L101'>101</a>
<a name='L102'></a><a href='#L102'>102</a>
<a name='L103'></a><a href='#L103'>103</a>
<a name='L104'></a><a href='#L104'>104</a>
<a name='L105'></a><a href='#L105'>105</a></td><td class="line-coverage quiet"><span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-yes">1x</span>
<span class="cline-any cline-yes">1x</span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-yes">1x</span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-neutral"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-no"> </span>
<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* @fileoverview Handles the setup and connection for the Stdio MCP transport.
* Implements the MCP Specification 2025-06-18 for stdio transport.
* This transport communicates directly over standard input (stdin) and
* standard output (stdout), typically used when the MCP server is launched
* as a child process by a host application.
*
* Specification Reference:
* https://modelcontextprotocol.io/specification/2025-06-18/basic/transports#stdio
*
* --- Authentication Note ---
* As per the MCP Authorization Specification (2025-06-18, Section 1.2),
* STDIO transports SHOULD NOT implement HTTP-based authentication flows.
* Authorization is typically handled implicitly by the host application
* controlling the server process. This implementation follows that guideline.
*
* @see {@link https://modelcontextprotocol.io/specification/2025-06-18/basic/authorization | MCP Authorization Specification}
* @module src/mcp-server/transports/stdioTransport
*/
import { McpServer } from '@modelcontextprotocol/sdk/server/mcp.js';
import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
import {
ErrorHandler,
type RequestContext,
logger,
logStartupBanner,
} from '@/utils/index.js';
/**
* Connects a given `McpServer` instance to the Stdio transport.
* This function initializes the SDK's `StdioServerTransport`, which manages
* communication over `process.stdin` and `process.stdout` according to the
* MCP stdio transport specification.
*
* MCP Spec Points Covered by SDK's `StdioServerTransport`:
* - Reads JSON-RPC messages (requests, notifications, responses, batches) from stdin.
* - Writes JSON-RPC messages to stdout.
* - Handles newline delimiters and ensures no embedded newlines in output messages.
* - Ensures only valid MCP messages are written to stdout.
*
* Logging via the `logger` utility MAY result in output to stderr, which is
* permitted by the spec for logging purposes.
*
* @param server - The `McpServer` instance.
* @param parentContext - The logging and tracing context from the calling function.
* @returns A promise that resolves when the Stdio transport is successfully connected.
* @throws {Error} If the connection fails during setup.
*/
<span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >export async function startStdioTransport(</span></span>
<span class="cstat-no" title="statement not covered" > server: McpServer,</span>
<span class="cstat-no" title="statement not covered" > parentContext: RequestContext,</span>
<span class="cstat-no" title="statement not covered" >): Promise<McpServer> {</span>
<span class="cstat-no" title="statement not covered" > const operationContext = {</span>
<span class="cstat-no" title="statement not covered" > ...parentContext,</span>
<span class="cstat-no" title="statement not covered" > operation: 'connectStdioTransport',</span>
<span class="cstat-no" title="statement not covered" > transportType: 'Stdio',</span>
<span class="cstat-no" title="statement not covered" > };</span>
<span class="cstat-no" title="statement not covered" > logger.info('Attempting to connect stdio transport...', operationContext);</span>
<span class="cstat-no" title="statement not covered" > try {</span>
<span class="cstat-no" title="statement not covered" > logger.debug('Creating StdioServerTransport instance...', operationContext);</span>
<span class="cstat-no" title="statement not covered" > const transport = new StdioServerTransport();</span>
<span class="cstat-no" title="statement not covered" > logger.debug(</span>
<span class="cstat-no" title="statement not covered" > 'Connecting McpServer instance to StdioServerTransport...',</span>
<span class="cstat-no" title="statement not covered" > operationContext,</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" > await server.connect(transport);</span>
<span class="cstat-no" title="statement not covered" > logger.info(</span>
<span class="cstat-no" title="statement not covered" > 'MCP Server connected and listening via stdio transport.',</span>
<span class="cstat-no" title="statement not covered" > operationContext,</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" > logStartupBanner(</span>
<span class="cstat-no" title="statement not covered" > `\nš MCP Server running in STDIO mode.\n (MCP Spec: 2025-06-18 Stdio Transport)\n`,</span>
<span class="cstat-no" title="statement not covered" > );</span>
<span class="cstat-no" title="statement not covered" > return server;</span>
<span class="cstat-no" title="statement not covered" > } catch (err) {</span>
// Let the ErrorHandler log the error with all context, then rethrow.
<span class="cstat-no" title="statement not covered" > throw ErrorHandler.handleError(err, {</span>
<span class="cstat-no" title="statement not covered" > operation: 'connectStdioTransport',</span>
<span class="cstat-no" title="statement not covered" > context: operationContext,</span>
<span class="cstat-no" title="statement not covered" > critical: true,</span>
<span class="cstat-no" title="statement not covered" > rethrow: true,</span>
<span class="cstat-no" title="statement not covered" > });</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" >}</span>
<span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >export async function stopStdioTransport(</span></span>
<span class="cstat-no" title="statement not covered" > server: McpServer,</span>
<span class="cstat-no" title="statement not covered" > parentContext: RequestContext,</span>
<span class="cstat-no" title="statement not covered" >): Promise<void> {</span>
<span class="cstat-no" title="statement not covered" > const operationContext = {</span>
<span class="cstat-no" title="statement not covered" > ...parentContext,</span>
<span class="cstat-no" title="statement not covered" > operation: 'stopStdioTransport',</span>
<span class="cstat-no" title="statement not covered" > transportType: 'Stdio',</span>
<span class="cstat-no" title="statement not covered" > };</span>
<span class="cstat-no" title="statement not covered" > logger.info('Attempting to stop stdio transport...', operationContext);</span>
<span class="cstat-no" title="statement not covered" > if (server) {</span>
<span class="cstat-no" title="statement not covered" > await server.close();</span>
<span class="cstat-no" title="statement not covered" > logger.info('Stdio transport stopped successfully.', operationContext);</span>
<span class="cstat-no" title="statement not covered" > }</span>
<span class="cstat-no" title="statement not covered" >}</span>
</pre></td></tr></table></pre>
<div class='push'></div><!-- for sticky footer -->
</div><!-- /wrapper -->
<div class='footer quiet pad2 space-top1 center small'>
Code coverage generated by
<a href="https://istanbul.js.org/" target="_blank" rel="noopener noreferrer">istanbul</a>
at 2025-10-15T17:09:47.939Z
</div>
<script src="../../../../prettify.js"></script>
<script>
window.onload = function () {
prettyPrint();
};
</script>
<script src="../../../../sorter.js"></script>
<script src="../../../../block-navigation.js"></script>
</body>
</html>