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import { GitLabVersionDetector, GitLabInstanceInfo } from "./GitLabVersionDetector";
import { SchemaIntrospector, SchemaInfo } from "./SchemaIntrospector";
import {
detectTokenScopes,
logTokenScopeInfo,
getToolScopeRequirements,
TokenScopeInfo,
} from "./TokenScopeDetector";
import { GITLAB_BASE_URL, GITLAB_TOKEN } from "../config";
import { isOAuthEnabled, getGitLabApiUrlFromContext } from "../oauth/index";
import { enhancedFetch } from "../utils/fetch";
import { logInfo, logDebug, logError } from "../logger";
import { InstanceRegistry } from "./InstanceRegistry.js";
import { CachedIntrospection } from "../config/instances-schema.js";
interface CacheEntry {
schemaInfo: SchemaInfo;
instanceInfo: GitLabInstanceInfo;
timestamp: number;
}
export class ConnectionManager {
private static instance: ConnectionManager | null = null;
private client: GraphQLClient | null = null;
private versionDetector: GitLabVersionDetector | null = null;
private schemaIntrospector: SchemaIntrospector | null = null;
private instanceInfo: GitLabInstanceInfo | null = null;
private schemaInfo: SchemaInfo | null = null;
private tokenScopeInfo: TokenScopeInfo | null = null;
private isInitialized: boolean = false;
private currentInstanceUrl: string | null = null;
/** Tracks which instance URL the cached instanceInfo/schemaInfo belongs to */
private introspectedInstanceUrl: string | null = null;
/** Deduplication map: prevents thundering herd on concurrent ensureIntrospected() calls */
private introspectionPromises = new Map<string, Promise<void>>();
private static introspectionCache = new Map<string, CacheEntry>();
private static readonly CACHE_TTL = 10 * 60 * 1000; // 10 minutes in milliseconds
private constructor() {}
public static getInstance(): ConnectionManager {
ConnectionManager.instance ??= new ConnectionManager();
return ConnectionManager.instance;
}
public async initialize(instanceUrl?: string): Promise<void> {
if (this.isInitialized) {
return;
}
try {
const oauthMode = isOAuthEnabled();
// Initialize InstanceRegistry for multi-instance support
const registry = InstanceRegistry.getInstance();
if (!registry.isInitialized()) {
await registry.initialize();
}
// Use provided instanceUrl or fall back to global GITLAB_BASE_URL
const baseUrl = instanceUrl ?? GITLAB_BASE_URL;
this.currentInstanceUrl = baseUrl;
// In OAuth mode, token comes from request context via enhancedFetch
// In static mode, require both base URL and token
if (!baseUrl) {
throw new Error("GitLab base URL is required");
}
if (!oauthMode && !GITLAB_TOKEN) {
throw new Error(
"GITLAB_TOKEN is required in static authentication mode. " +
"Run `npx @structured-world/gitlab-mcp setup` for interactive configuration, " +
"or set the environment variable and restart. " +
"Docs: https://gitlab-mcp.sw.foundation/guide/quick-start"
);
}
// Construct GraphQL endpoint from base URL
const endpoint = `${baseUrl}/api/graphql`;
// In OAuth mode, don't set static auth header
// enhancedFetch will add the token from request context
// GITLAB_TOKEN is guaranteed non-empty here (validated above for non-OAuth mode)
const clientOptions: { headers?: Record<string, string> } = oauthMode
? {}
: { headers: { "PRIVATE-TOKEN": String(GITLAB_TOKEN) } };
this.client = new GraphQLClient(endpoint, clientOptions);
this.versionDetector = new GitLabVersionDetector(this.client);
this.schemaIntrospector = new SchemaIntrospector(this.client);
// In OAuth mode, try unauthenticated version detection first
// Many GitLab instances expose /api/v4/version without auth
if (oauthMode) {
logInfo("OAuth mode: attempting unauthenticated version detection");
try {
const versionResponse = await fetch(`${baseUrl}/api/v4/version`);
if (versionResponse.ok) {
const versionData = (await versionResponse.json()) as {
version: string;
enterprise?: boolean;
};
logInfo("Detected GitLab version without authentication", {
version: versionData.version,
});
// Create basic instance info from unauthenticated response
// Default to "premium" tier for enterprise instances - will be refined on first authenticated request
this.instanceInfo = {
version: versionData.version,
tier: versionData.enterprise ? "premium" : "free",
features: this.getDefaultFeatures(versionData.enterprise ?? false),
detectedAt: new Date(),
};
// Schema introspection still deferred (requires auth for full introspection)
logInfo(
"OAuth mode: version detected, full introspection deferred until first authenticated request"
);
} else {
logInfo(
"OAuth mode: unauthenticated version detection failed, deferring all introspection",
{
status: versionResponse.status,
}
);
}
} catch (error) {
logInfo(
"OAuth mode: unauthenticated version detection failed, deferring all introspection",
{
error: error instanceof Error ? error.message : String(error),
}
);
}
this.isInitialized = true;
return;
}
// Step 1: Detect token scopes BEFORE GraphQL introspection
// This prevents ugly 401 stack traces when token lacks api/read_api scope
this.tokenScopeInfo = await detectTokenScopes();
if (this.tokenScopeInfo) {
// Log token scope info — derive total tools dynamically from scope requirements map
const totalTools = Object.keys(getToolScopeRequirements()).length;
logTokenScopeInfo(this.tokenScopeInfo, totalTools);
// If token lacks GraphQL access, skip introspection entirely
if (!this.tokenScopeInfo.hasGraphQLAccess) {
// Detect version via REST (doesn't require api scope for most GitLab versions)
this.instanceInfo = await this.detectVersionViaREST();
this.isInitialized = true;
return;
}
}
// Step 2: Full GraphQL introspection (token has api or read_api scope)
const cached = ConnectionManager.introspectionCache.get(endpoint);
const now = Date.now();
if (cached && now - cached.timestamp < ConnectionManager.CACHE_TTL) {
logInfo("Using cached GraphQL introspection data");
this.instanceInfo = cached.instanceInfo;
this.schemaInfo = cached.schemaInfo;
// Track which instance was introspected to avoid re-introspection in ensureIntrospected()
this.introspectedInstanceUrl = baseUrl;
} else {
logDebug("Introspecting GitLab GraphQL schema...");
// Detect instance info and introspect schema in parallel
const [instanceInfo, schemaInfo] = await Promise.all([
this.versionDetector.detectInstance(),
this.schemaIntrospector.introspectSchema(),
]);
this.instanceInfo = instanceInfo;
this.schemaInfo = schemaInfo;
// Track which instance was introspected to avoid re-introspection in ensureIntrospected()
this.introspectedInstanceUrl = baseUrl;
// Cache the results
ConnectionManager.introspectionCache.set(endpoint, {
instanceInfo,
schemaInfo,
timestamp: now,
});
logInfo("GraphQL schema introspection completed");
}
this.isInitialized = true;
logInfo("GitLab instance and schema detected", {
version: this.instanceInfo?.version,
tier: this.instanceInfo?.tier,
features: this.instanceInfo
? Object.entries(this.instanceInfo.features)
.filter(([, enabled]) => enabled)
.map(([feature]) => feature)
: [],
widgetTypes: this.schemaInfo?.workItemWidgetTypes.length || 0,
schemaTypes: this.schemaInfo?.typeDefinitions.size || 0,
});
} catch (error) {
logError("Failed to initialize connection", { err: error as Error });
throw error;
}
}
/**
* Ensure schema introspection has been performed.
* In OAuth mode, this should be called within a token context.
* Supports per-instance introspection caching via InstanceRegistry.
*
* Uses Promise-based deduplication to prevent thundering herd when
* multiple concurrent requests trigger introspection simultaneously.
*/
public async ensureIntrospected(): Promise<void> {
if (!this.client || !this.versionDetector || !this.schemaIntrospector) {
throw new Error("Connection not initialized. Call initialize() first.");
}
// Determine the instance URL for caching
// In OAuth mode, use URL from context; in static mode, use current instance URL
const instanceUrl = getGitLabApiUrlFromContext() ?? this.currentInstanceUrl ?? GITLAB_BASE_URL;
// Already introspected for THIS instance - reuse cached data
// In multi-instance mode, different instances need separate introspection
if (this.instanceInfo && this.schemaInfo && this.introspectedInstanceUrl === instanceUrl) {
return;
}
// Deduplication: if another request is already introspecting this instance, await it
const existingPromise = this.introspectionPromises.get(instanceUrl);
if (existingPromise) {
logDebug("Awaiting existing introspection for instance", { url: instanceUrl });
await existingPromise;
return;
}
// Start introspection and register the promise for deduplication
const promise = this.doIntrospection(instanceUrl);
this.introspectionPromises.set(instanceUrl, promise);
try {
await promise;
} finally {
this.introspectionPromises.delete(instanceUrl);
}
}
/**
* Perform actual introspection logic for an instance.
* Extracted from ensureIntrospected() for deduplication support.
*/
private async doIntrospection(instanceUrl: string): Promise<void> {
// Caller (ensureIntrospected) guarantees these are non-null
const client = this.client;
const versionDet = this.versionDetector;
const schemaDet = this.schemaIntrospector;
Iif (!client || !versionDet || !schemaDet) {
throw new Error("Connection not initialized. Call initialize() first.");
}
// Use per-instance GraphQL client for thread-safe multi-instance support
// This avoids the singleton endpoint mutation issue in concurrent OAuth scenarios
const endpoint = client.endpoint;
const registry = InstanceRegistry.getInstance();
// Check InstanceRegistry cache first (for multi-instance support)
Eif (registry.isInitialized()) {
const cachedIntrospection = registry.getIntrospection(instanceUrl);
if (cachedIntrospection) {
logInfo("Using cached introspection from InstanceRegistry", { url: instanceUrl });
this.instanceInfo = {
version: cachedIntrospection.version,
tier: cachedIntrospection.tier as "free" | "premium" | "ultimate",
features: cachedIntrospection.features as unknown as GitLabInstanceInfo["features"],
detectedAt: cachedIntrospection.cachedAt,
};
this.schemaInfo = cachedIntrospection.schemaInfo as SchemaInfo;
this.introspectedInstanceUrl = instanceUrl;
return;
}
}
// Check legacy cache: prefer instanceUrl for multi-instance consistency,
// but fall back to endpoint-keyed entries
// (initialize() populates cache with endpoint as key).
const primaryCacheKey = instanceUrl ?? endpoint;
const legacyCacheKey = endpoint;
let cached = ConnectionManager.introspectionCache.get(primaryCacheKey);
Eif (!cached && primaryCacheKey !== legacyCacheKey) {
cached = ConnectionManager.introspectionCache.get(legacyCacheKey);
}
const now = Date.now();
if (cached && now - cached.timestamp < ConnectionManager.CACHE_TTL) {
logInfo("Using cached GraphQL introspection data");
this.instanceInfo = cached.instanceInfo;
this.schemaInfo = cached.schemaInfo;
this.introspectedInstanceUrl = instanceUrl;
return;
}
logDebug("Introspecting GitLab GraphQL schema (deferred OAuth mode)...");
// For multi-instance OAuth: use per-instance client if instanceUrl differs from current
// This ensures introspection runs against the correct instance
let versionDetector = versionDet;
let schemaIntrospector = schemaDet;
Iif (registry.isInitialized() && instanceUrl !== this.currentInstanceUrl) {
const instanceClient = this.getInstanceClient(instanceUrl);
if (instanceClient !== client) {
// Create temporary detectors with per-instance client
versionDetector = new GitLabVersionDetector(instanceClient);
schemaIntrospector = new SchemaIntrospector(instanceClient);
logDebug("Using per-instance detectors for introspection", { instanceUrl });
}
}
// Detect instance info and introspect schema in parallel
const [instanceInfo, schemaInfo] = await Promise.all([
versionDetector.detectInstance(),
schemaIntrospector.introspectSchema(),
]);
this.instanceInfo = instanceInfo;
this.schemaInfo = schemaInfo;
this.introspectedInstanceUrl = instanceUrl;
// Cache the results in legacy cache (use primaryCacheKey for consistency)
ConnectionManager.introspectionCache.set(primaryCacheKey, {
instanceInfo,
schemaInfo,
timestamp: now,
});
// Also cache in InstanceRegistry for multi-instance support
Eif (registry.isInitialized()) {
const cachedIntrospection: CachedIntrospection = {
version: instanceInfo.version,
tier: instanceInfo.tier,
features: instanceInfo.features as unknown as Record<string, boolean>,
schemaInfo,
cachedAt: new Date(),
};
registry.setIntrospection(instanceUrl, cachedIntrospection);
}
logInfo("GraphQL schema introspection completed (deferred)", {
version: this.instanceInfo?.version,
tier: this.instanceInfo?.tier,
widgetTypes: this.schemaInfo?.workItemWidgetTypes.length || 0,
});
}
public getClient(): GraphQLClient {
if (!this.client) {
throw new Error("Connection not initialized. Call initialize() first.");
}
return this.client;
}
/**
* Get a thread-safe GraphQL client for the current or specified instance
*
* In OAuth mode with multi-instance support, this returns a per-instance
* client from the connection pool, avoiding singleton endpoint mutation.
* In static mode, returns the default singleton client.
*
* @param instanceUrl - Optional instance URL (defaults to current context)
* @param authHeaders - Optional auth headers for OAuth per-request tokens
*/
public getInstanceClient(
instanceUrl?: string,
authHeaders?: Record<string, string>
): GraphQLClient {
const registry = InstanceRegistry.getInstance();
// Determine which instance to use
const targetUrl = instanceUrl ?? getGitLabApiUrlFromContext() ?? this.currentInstanceUrl;
// If registry is initialized and instance is registered, use per-instance client
Iif (targetUrl && registry.isInitialized() && registry.has(targetUrl)) {
const client = registry.getGraphQLClient(targetUrl, authHeaders);
if (client) {
return client;
}
}
// Fallback to singleton client (static mode or unregistered instance)
Iif (!this.client) {
throw new Error("Connection not initialized. Call initialize() first.");
}
return this.client;
}
public getVersionDetector(): GitLabVersionDetector {
if (!this.versionDetector) {
throw new Error("Connection not initialized. Call initialize() first.");
}
return this.versionDetector;
}
public getSchemaIntrospector(): SchemaIntrospector {
if (!this.schemaIntrospector) {
throw new Error("Connection not initialized. Call initialize() first.");
}
return this.schemaIntrospector;
}
public getInstanceInfo(): GitLabInstanceInfo {
if (!this.instanceInfo) {
throw new Error("Connection not initialized. Call initialize() first.");
}
return this.instanceInfo;
}
public getSchemaInfo(): SchemaInfo {
if (!this.schemaInfo) {
throw new Error("Connection not initialized. Call initialize() first.");
}
return this.schemaInfo;
}
/**
* Get the current instance URL (for tracking instance switches)
*/
public getCurrentInstanceUrl(): string | null {
return this.currentInstanceUrl;
}
public isFeatureAvailable(feature: keyof GitLabInstanceInfo["features"]): boolean {
if (!this.instanceInfo) {
return false;
}
return this.instanceInfo.features[feature];
}
public getTier(): string {
if (!this.instanceInfo) {
return "unknown";
}
return this.instanceInfo.tier;
}
public getVersion(): string {
if (!this.instanceInfo) {
return "unknown";
}
return this.instanceInfo.version;
}
public isWidgetAvailable(widgetType: string): boolean {
if (!this.schemaIntrospector) {
return false;
}
return this.schemaIntrospector.isWidgetTypeAvailable(widgetType);
}
/**
* Get detected token scope info (null if detection was skipped or failed)
*/
public getTokenScopeInfo(): TokenScopeInfo | null {
return this.tokenScopeInfo;
}
/**
* Re-detect token scopes and update internal state.
* Returns true if scopes changed (requiring tool registry refresh).
*
* Used by whoami action to pick up token permission changes without restart.
*/
public async refreshTokenScopes(): Promise<boolean> {
// Skip in OAuth mode - scopes come from request context, not static token
if (isOAuthEnabled()) {
return false;
}
const previousScopes = this.tokenScopeInfo?.scopes ?? [];
const previousHasGraphQL = this.tokenScopeInfo?.hasGraphQLAccess ?? false;
const previousHasWrite = this.tokenScopeInfo?.hasWriteAccess ?? false;
// Re-detect token scopes
const newScopeInfo = await detectTokenScopes();
if (!newScopeInfo) {
// Detection failed - keep existing state
return false;
}
// Check if scopes changed
const newScopes = newScopeInfo.scopes;
const scopesChanged =
previousScopes.length !== newScopes.length ||
!previousScopes.every(s => newScopes.includes(s)) ||
previousHasGraphQL !== newScopeInfo.hasGraphQLAccess ||
previousHasWrite !== newScopeInfo.hasWriteAccess;
if (scopesChanged) {
this.tokenScopeInfo = newScopeInfo;
logInfo("Token scopes changed - tool registry will be refreshed", {
previousScopes,
newScopes,
hasGraphQLAccess: newScopeInfo.hasGraphQLAccess,
hasWriteAccess: newScopeInfo.hasWriteAccess,
});
}
return scopesChanged;
}
/**
* Detect GitLab version via REST API (fallback when GraphQL is not available).
* Uses GET /api/v4/version; authentication requirements depend on instance
* configuration. This helper always sends the configured token as a fallback.
*/
private async detectVersionViaREST(): Promise<GitLabInstanceInfo> {
try {
const baseUrl = this.currentInstanceUrl ?? GITLAB_BASE_URL;
const response = await enhancedFetch(`${baseUrl}/api/v4/version`, {
headers: {
"PRIVATE-TOKEN": GITLAB_TOKEN ?? "",
Accept: "application/json",
},
retry: false, // Don't retry version detection at startup
});
if (response.ok) {
const data = (await response.json()) as {
version: string;
revision: string;
enterprise?: boolean;
};
logInfo("Detected GitLab version via REST (GraphQL unavailable)", {
version: data.version,
enterprise: data.enterprise,
});
return {
version: data.version,
tier: data.enterprise ? "premium" : "free",
features: this.getDefaultFeatures(data.enterprise ?? false),
detectedAt: new Date(),
};
}
// Version endpoint also failed - return minimal info
logInfo("REST version detection failed, using defaults", { status: response.status });
} catch (error) {
logInfo("REST version detection failed, using defaults", {
error: error instanceof Error ? error.message : String(error),
});
}
// Fallback: return unknown version with default features
return {
version: "unknown",
tier: "free",
features: this.getDefaultFeatures(false),
detectedAt: new Date(),
};
}
/**
* Get default features based on whether GitLab is enterprise edition.
* In OAuth mode without full introspection, we default to enabling most features
* to allow tools to be available - they will fail gracefully if not actually available.
*/
private getDefaultFeatures(isEnterprise: boolean): GitLabInstanceInfo["features"] {
// Default to enabling most features - better to allow and fail gracefully
// than to block tools that might actually be available
return {
workItems: true,
epics: isEnterprise,
iterations: isEnterprise,
roadmaps: isEnterprise,
portfolioManagement: isEnterprise,
advancedSearch: true,
codeReview: true,
securityDashboard: isEnterprise,
complianceFramework: isEnterprise,
valueStreamAnalytics: isEnterprise,
customFields: isEnterprise,
okrs: isEnterprise,
healthStatus: isEnterprise,
weight: isEnterprise,
multiLevelEpics: isEnterprise,
serviceDesk: true,
requirements: isEnterprise,
qualityManagement: isEnterprise,
timeTracking: true,
crmContacts: true,
vulnerabilities: isEnterprise,
errorTracking: true,
designManagement: true,
linkedResources: true,
emailParticipants: true,
};
}
/**
* Re-initialize connection with a different GitLab instance.
* Used when switching instances in static token mode.
*
* @param newInstanceUrl - The new GitLab instance URL to connect to
*/
public async reinitialize(newInstanceUrl: string): Promise<void> {
logInfo("Re-initializing ConnectionManager for new instance", {
newInstanceUrl,
});
// Reset current state
this.reset();
// Clear instance-level cache for the new URL
const registry = InstanceRegistry.getInstance();
registry.clearIntrospectionCache(newInstanceUrl);
// Re-initialize the connection with the new instance URL
// This builds a new GraphQL client pointing to the new instance
await this.initialize(newInstanceUrl);
logInfo("ConnectionManager re-initialized", {
version: this.instanceInfo?.version,
tier: this.instanceInfo?.tier,
instanceUrl: this.currentInstanceUrl,
});
}
public reset(): void {
this.client = null;
this.versionDetector = null;
this.schemaIntrospector = null;
this.instanceInfo = null;
this.schemaInfo = null;
this.tokenScopeInfo = null;
this.currentInstanceUrl = null;
this.introspectedInstanceUrl = null;
this.introspectionPromises.clear();
this.isInitialized = false;
}
}
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