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* Request Tracker
*
* Implements request stack aggregation pattern: collect all events during a request
* lifecycle and output a single condensed log line when the request completes.
*
* Lifecycle:
* 1. Request arrives -> openStack() -> Record start time, client info
* 2. Events during request -> setTool(), setGitLabResponse(), addDetail()
* 3. Request completes -> closeStack() -> Calculate duration, output log
*
* Stack closes on: success response, error, or disconnect/timeout
*
* Request Context:
* Uses AsyncLocalStorage to track current requestId across async operations.
* This allows setTool/setGitLabResponse/addDetail to work without explicit requestId.
*/
import { AsyncLocalStorage } from "async_hooks";
import type { RequestStack } from "./types.js";
import { formatAccessLog, createAccessLogEntry } from "./access-log.js";
import { logger, LOG_JSON, logDebug } from "../logger.js";
/**
* Request context stored in AsyncLocalStorage
*/
export interface RequestContext {
requestId: string;
}
/**
* AsyncLocalStorage for request context
* Allows tracking of current request across async operations
*/
const requestContext = new AsyncLocalStorage<RequestContext>();
/**
* Get current request ID from async context
*/
export function getCurrentRequestId(): string | undefined {
return requestContext.getStore()?.requestId;
}
/**
* Run a function with request context
*/
export function runWithRequestContext<T>(requestId: string, fn: () => T): T {
return requestContext.run({ requestId }, fn);
}
/**
* Run an async function with request context
*/
export async function runWithRequestContextAsync<T>(
requestId: string,
fn: () => Promise<T>
): Promise<T> {
return requestContext.run({ requestId }, fn);
}
/**
* Request tracker manages request stacks for concurrent requests.
*
* Uses requestId as key to track multiple concurrent requests (especially in HTTP mode).
* Each request gets its own stack that accumulates events until completion.
*/
export class RequestTracker {
private stacks: Map<string, RequestStack> = new Map();
private enabled: boolean;
constructor(enabled = true) {
this.enabled = enabled;
}
/**
* Check if condensed logging is enabled
*/
isEnabled(): boolean {
return this.enabled;
}
/**
* Enable or disable condensed logging
*/
setEnabled(enabled: boolean): void {
this.enabled = enabled;
}
/**
* Open a new request stack when request arrives
*
* @param requestId - Unique identifier for this request
* @param clientIp - Client IP address
* @param method - HTTP method
* @param path - Request path
* @param sessionId - Optional session ID (MCP or OAuth)
*/
openStack(
requestId: string,
clientIp: string,
method: string,
path: string,
sessionId?: string
): void {
if (!this.enabled) return;
const stack: RequestStack = {
startTime: Date.now(),
clientIp,
method,
path,
sessionId,
details: {},
};
this.stacks.set(requestId, stack);
logDebug("Request stack opened", { requestId, clientIp, method, path });
}
/**
* Get the current stack for a request
*/
getStack(requestId: string): RequestStack | undefined {
return this.stacks.get(requestId);
}
/**
* Set tool name and action for the request
*/
setTool(requestId: string, tool: string, action?: string): void {
const stack = this.stacks.get(requestId);
if (!stack) return;
stack.tool = tool;
if (action) {
stack.action = action;
}
logDebug("Tool set on request stack", { requestId, tool, action });
}
/**
* Set GitLab API response information
*/
setGitLabResponse(
requestId: string,
status: number | "timeout" | "error",
durationMs?: number
): void {
const stack = this.stacks.get(requestId);
Iif (!stack) return;
stack.gitlabStatus = status;
Eif (durationMs !== undefined) {
stack.gitlabDuration = durationMs;
}
logDebug("GitLab response set on request stack", {
requestId,
gitlabStatus: status,
gitlabDuration: durationMs,
});
}
/**
* Add a detail key-value pair to the request
*/
addDetail(requestId: string, key: string, value: string | number | boolean): void {
const stack = this.stacks.get(requestId);
Iif (!stack) return;
stack.details[key] = value;
}
/**
* Add multiple details at once
*/
addDetails(requestId: string, details: Record<string, string | number | boolean>): void {
const stack = this.stacks.get(requestId);
Iif (!stack) return;
Object.assign(stack.details, details);
}
/**
* Set error on the request
*/
setError(requestId: string, error: string): void {
const stack = this.stacks.get(requestId);
Iif (!stack) return;
stack.error = error;
stack.details.err = error;
}
/**
* Set context path on the request
*/
setContext(requestId: string, context: string): void {
const stack = this.stacks.get(requestId);
if (!stack) return;
stack.context = context;
}
/**
* Set read-only mode flag on the request
*/
setReadOnly(requestId: string, readOnly: boolean): void {
const stack = this.stacks.get(requestId);
Iif (!stack) return;
stack.readOnly = readOnly;
}
/**
* Update session ID on the request
* Used when session ID is assigned after request stack is opened
*/
setSessionId(requestId: string, sessionId: string): void {
const stack = this.stacks.get(requestId);
Iif (!stack) return;
stack.sessionId = sessionId;
}
/**
* Close the request stack and output access log
*
* @param requestId - Request identifier
* @param status - HTTP response status code
* @returns The formatted access log line (for testing) or undefined if disabled/not found
*/
closeStack(requestId: string, status: number): string | undefined {
const stack = this.stacks.get(requestId);
if (!stack) {
logDebug("Request stack not found on close", { requestId });
return undefined;
}
// Remove from map first to prevent duplicate closes
this.stacks.delete(requestId);
// Set final status
stack.status = status;
if (!this.enabled) {
return undefined;
}
// Format and log the access entry
const entry = createAccessLogEntry(stack);
const logLine = formatAccessLog(entry);
// Output the condensed access log at info level
// JSON mode: include full accessLog object for log aggregators (Loki, ELK, etc.)
// Plain mode: message only - prevents pino-pretty from outputting multiline JSON
Iif (LOG_JSON) {
logger.info({ accessLog: entry }, logLine);
} else {
logger.info(logLine);
}
return logLine;
}
/**
* Close stack due to error without a final status
* Used when connection is lost before response is sent
*/
closeStackWithError(requestId: string, error: string): string | undefined {
const stack = this.stacks.get(requestId);
Iif (!stack) return undefined;
stack.error = error;
stack.details.err = error;
return this.closeStack(requestId, 0);
}
/**
* Check if a stack exists for a request
*/
hasStack(requestId: string): boolean {
return this.stacks.has(requestId);
}
/**
* Get current number of open stacks (for diagnostics)
*/
getOpenStackCount(): number {
return this.stacks.size;
}
/**
* Clear all stacks (for testing or shutdown)
*/
clear(): void {
this.stacks.clear();
}
// ============================================================================
// Context-aware methods (use current request from AsyncLocalStorage)
// ============================================================================
/**
* Set tool for current request (context-aware)
* Uses AsyncLocalStorage to get current requestId
*/
setToolForCurrentRequest(tool: string, action?: string): void {
const requestId = getCurrentRequestId();
if (requestId) {
this.setTool(requestId, tool, action);
}
}
/**
* Set GitLab response for current request (context-aware)
*/
setGitLabResponseForCurrentRequest(
status: number | "timeout" | "error",
durationMs?: number
): void {
const requestId = getCurrentRequestId();
if (requestId) {
this.setGitLabResponse(requestId, status, durationMs);
}
}
/**
* Add detail for current request (context-aware)
*/
addDetailForCurrentRequest(key: string, value: string | number | boolean): void {
const requestId = getCurrentRequestId();
if (requestId) {
this.addDetail(requestId, key, value);
}
}
/**
* Add multiple details for current request (context-aware)
*/
addDetailsForCurrentRequest(details: Record<string, string | number | boolean>): void {
const requestId = getCurrentRequestId();
Eif (requestId) {
this.addDetails(requestId, details);
}
}
/**
* Set error for current request (context-aware)
*/
setErrorForCurrentRequest(error: string): void {
const requestId = getCurrentRequestId();
if (requestId) {
this.setError(requestId, error);
}
}
/**
* Set context for current request (context-aware)
*/
setContextForCurrentRequest(context: string): void {
const requestId = getCurrentRequestId();
if (requestId) {
this.setContext(requestId, context);
}
}
/**
* Set read-only for current request (context-aware)
*/
setReadOnlyForCurrentRequest(readOnly: boolean): void {
const requestId = getCurrentRequestId();
if (requestId) {
this.setReadOnly(requestId, readOnly);
}
}
/**
* Set session ID for current request (context-aware)
*/
setSessionIdForCurrentRequest(sessionId: string): void {
const requestId = getCurrentRequestId();
if (requestId) {
this.setSessionId(requestId, sessionId);
}
}
}
/**
* Singleton instance of RequestTracker
*
* Used throughout the application to track requests.
* Enable/disable via setEnabled() based on LOG_FORMAT config.
*/
let globalTracker: RequestTracker | null = null;
/**
* Get the global RequestTracker instance
*/
export function getRequestTracker(): RequestTracker {
globalTracker ??= new RequestTracker();
return globalTracker;
}
/**
* Reset the global tracker (for testing)
*/
export function resetRequestTracker(): void {
globalTracker = null;
}
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