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<h1><a href="../../index.html">All files</a> / <a href="index.html">lib/message</a> MessageRouter.js</h1>
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<span class="strong">0% </span>
<span class="quiet">Statements</span>
<span class='fraction'>0/65</span>
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<div class='fl pad1y space-right2'>
<span class="strong">0% </span>
<span class="quiet">Branches</span>
<span class='fraction'>0/36</span>
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<span class="strong">0% </span>
<span class="quiet">Functions</span>
<span class='fraction'>0/10</span>
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<div class='fl pad1y space-right2'>
<span class="strong">0% </span>
<span class="quiet">Lines</span>
<span class='fraction'>0/63</span>
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<pre><table class="coverage">
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">const { EventEmitter } = <span class="cstat-no" title="statement not covered" >require('events');</span>
const { v4: uuidv4 } = <span class="cstat-no" title="statement not covered" >require('uuid');</span>
/**
* Handles routing and delivery of messages within the MCP server.
* Manages message queues, rate limiting, and delivery to the appropriate handlers.
*/
class MessageRouter extends EventEmitter {
/**
* @param {Object} options - Configuration options
* @param {SessionManager} options.sessionManager - Instance of SessionManager
* @param {number} [options.maxConcurrent=5] - Maximum concurrent messages per session
* @param {number} [options.rateLimitWindow=1000] - Rate limit window in ms
* @param {number} [options.rateLimitMax=10] - Maximum messages per window
*/
<span class="fstat-no" title="function not covered" > co</span>nstructor({
sessionManager,
maxConcurrent = <span class="branch-0 cbranch-no" title="branch not covered" >5, </span>
rateLimitWindow = <span class="branch-0 cbranch-no" title="branch not covered" >1000, </span>
rateLimitMax = <span class="branch-0 cbranch-no" title="branch not covered" >10 </span>
} = <span class="branch-0 cbranch-no" title="branch not covered" >{})</span> {
<span class="cstat-no" title="statement not covered" > super();</span>
<span class="cstat-no" title="statement not covered" > if (!sessionManager) {</span>
<span class="cstat-no" title="statement not covered" > throw new Error('SessionManager is required');</span>
}
<span class="cstat-no" title="statement not covered" > this.sessionManager = sessionManager;</span>
<span class="cstat-no" title="statement not covered" > this.maxConcurrent = maxConcurrent;</span>
<span class="cstat-no" title="statement not covered" > this.rateLimitWindow = rateLimitWindow;</span>
<span class="cstat-no" title="statement not covered" > this.rateLimitMax = rateLimitMax;</span>
// Track rate limits by session ID
<span class="cstat-no" title="statement not covered" > this.rateLimits = new Map();</span>
// Track active message counts by session ID
<span class="cstat-no" title="statement not covered" > this.activeCounts = new Map();</span>
// Message queues by session ID
<span class="cstat-no" title="statement not covered" > this.queues = new Map();</span>
// Bind methods
<span class="cstat-no" title="statement not covered" > this.processQueue = this.processQueue.bind(this);</span>
}
/**
* Check if a message is allowed based on rate limits
* @private
* @param {string} sessionId - The session ID
* @returns {boolean} True if allowed, false if rate limited
*/
<span class="fstat-no" title="function not covered" > _c</span>heckRateLimit(sessionId) {
const now = <span class="cstat-no" title="statement not covered" >Date.now();</span>
const sessionLimit = <span class="cstat-no" title="statement not covered" >this.rateLimits.get(sessionId) || { count: 0, resetTime: 0 };</span>
// Reset counter if window has passed
<span class="cstat-no" title="statement not covered" > if (now >= sessionLimit.resetTime) {</span>
<span class="cstat-no" title="statement not covered" > sessionLimit.count = 0;</span>
<span class="cstat-no" title="statement not covered" > sessionLimit.resetTime = now + this.rateLimitWindow;</span>
}
// Check if rate limited
<span class="cstat-no" title="statement not covered" > if (sessionLimit.count >= this.rateLimitMax) {</span>
<span class="cstat-no" title="statement not covered" > return false;</span>
}
// Increment counter
<span class="cstat-no" title="statement not covered" > sessionLimit.count++;</span>
<span class="cstat-no" title="statement not covered" > this.rateLimits.set(sessionId, sessionLimit);</span>
<span class="cstat-no" title="statement not covered" > return true;</span>
}
/**
* Process the next message in the queue for a session
* @private
* @param {string} sessionId - The session ID
*/
<span class="fstat-no" title="function not covered" > as</span>ync processQueue(sessionId) {
const queue = <span class="cstat-no" title="statement not covered" >this.queues.get(sessionId) || [];</span>
const activeCount = <span class="cstat-no" title="statement not covered" >this.activeCounts.get(sessionId) || 0;</span>
// If queue is empty or we've hit concurrency limit, stop processing
<span class="cstat-no" title="statement not covered" > if (queue.length === 0 || activeCount >= this.maxConcurrent) {</span>
<span class="cstat-no" title="statement not covered" > return;</span>
}
// Get next message from queue
const { message, resolve, reject } = <span class="cstat-no" title="statement not covered" >queue.shift();</span>
// Update active count
<span class="cstat-no" title="statement not covered" > this.activeCounts.set(sessionId, activeCount + 1);</span>
<span class="cstat-no" title="statement not covered" > try {</span>
// Check rate limit
<span class="cstat-no" title="statement not covered" > if (!this._checkRateLimit(sessionId)) {</span>
<span class="cstat-no" title="statement not covered" > throw new Error('Rate limit exceeded');</span>
}
// Get session and validate
const session = <span class="cstat-no" title="statement not covered" >this.sessionManager.getSession(sessionId);</span>
<span class="cstat-no" title="statement not covered" > if (!session) {</span>
<span class="cstat-no" title="statement not covered" > throw new Error('Session not found or expired');</span>
}
// Emit message processing event
<span class="cstat-no" title="statement not covered" > this.emit('message:processing', { sessionId, message });</span>
// Process the message (this would be connected to your actual message handler)
const result = <span class="cstat-no" title="statement not covered" >await this._processMessage(session, message);</span>
// Emit completion event
<span class="cstat-no" title="statement not covered" > this.emit('message:complete', { sessionId, message, result });</span>
// Resolve the promise
<span class="cstat-no" title="statement not covered" > resolve(result);</span>
} catch (error) {
// Emit error event
<span class="cstat-no" title="statement not covered" > this.emit('message:error', { sessionId, message, error });</span>
// Reject the promise
<span class="cstat-no" title="statement not covered" > reject(error);</span>
} finally {
// Update active count
const newCount = <span class="cstat-no" title="statement not covered" >(this.activeCounts.get(sessionId) || 1) - 1;</span>
<span class="cstat-no" title="statement not covered" > this.activeCounts.set(sessionId, newCount);</span>
// Process next message in queue
<span class="cstat-no" title="statement not covered" > setImmediate(<span class="fstat-no" title="function not covered" >()</span> => <span class="cstat-no" title="statement not covered" >this.processQueue(sessionId))</span>;</span>
}
}
/**
* Process a message (to be implemented by subclasses or extended)
* @protected
* @param {Object} session - The session object
* @param {Object} message - The message to process
* @returns {Promise<Object>} The processing result
*/
<span class="fstat-no" title="function not covered" > as</span>ync _processMessage(session, message) {
// This should be overridden by subclasses or monkey-patched
// to provide actual message processing logic
<span class="cstat-no" title="statement not covered" > return { status: 'processed', messageId: message.id };</span>
}
/**
* Queue a message for processing
* @param {string} sessionId - The session ID
* @param {Object} message - The message to process
* @returns {Promise<Object>} Resolves when the message is processed
*/
<span class="fstat-no" title="function not covered" > as</span>ync queueMessage(sessionId, message) {
// Ensure message has an ID
<span class="cstat-no" title="statement not covered" > if (!message.id) {</span>
<span class="cstat-no" title="statement not covered" > message.id = uuidv4();</span>
}
// Create a new queue if it doesn't exist
<span class="cstat-no" title="statement not covered" > if (!this.queues.has(sessionId)) {</span>
<span class="cstat-no" title="statement not covered" > this.queues.set(sessionId, []);</span>
<span class="cstat-no" title="statement not covered" > this.activeCounts.set(sessionId, 0);</span>
}
// Create a promise that will be resolved when the message is processed
<span class="cstat-no" title="statement not covered" > return new Promise(<span class="fstat-no" title="function not covered" >(r</span>esolve, reject) => {</span>
const queue = <span class="cstat-no" title="statement not covered" >this.queues.get(sessionId);</span>
// Add to queue
<span class="cstat-no" title="statement not covered" > queue.push({</span>
message,
resolve,
reject,
timestamp: Date.now()
});
// Process the queue
<span class="cstat-no" title="statement not covered" > setImmediate(<span class="fstat-no" title="function not covered" >()</span> => <span class="cstat-no" title="statement not covered" >this.processQueue(sessionId))</span>;</span>
});
}
/**
* Get queue status for a session
* @param {string} sessionId - The session ID
* @returns {Object} Queue status
*/
<span class="fstat-no" title="function not covered" > ge</span>tQueueStatus(sessionId) {
const queue = <span class="cstat-no" title="statement not covered" >this.queues.get(sessionId) || [];</span>
const activeCount = <span class="cstat-no" title="statement not covered" >this.activeCounts.get(sessionId) || 0;</span>
const rateLimit = <span class="cstat-no" title="statement not covered" >this.rateLimits.get(sessionId) || { count: 0, resetTime: 0 };</span>
<span class="cstat-no" title="statement not covered" > return {</span>
queued: queue.length,
active: activeCount,
rateLimited: rateLimit.count >= this.rateLimitMax,
rateLimit: {
current: rateLimit.count,
max: this.rateLimitMax,
resetIn: Math.max(0, rateLimit.resetTime - Date.now())
},
maxConcurrent: this.maxConcurrent
};
}
/**
* Clean up resources
*/
<span class="fstat-no" title="function not covered" > de</span>stroy() {
// Clear any intervals or timeouts
<span class="cstat-no" title="statement not covered" > this.removeAllListeners();</span>
// Clear queues
<span class="cstat-no" title="statement not covered" > this.queues.clear();</span>
<span class="cstat-no" title="statement not covered" > this.activeCounts.clear();</span>
<span class="cstat-no" title="statement not covered" > this.rateLimits.clear();</span>
}
}
<span class="cstat-no" title="statement not covered" >module.exports = MessageRouter;</span>
</pre></td></tr></table></pre>
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