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* @module mcp-client/client
* @description MCPClient class providing typed access to 32 riksdag-regering
* intelligence tools via JSON-RPC 2.0.
*
* @author Hack23 AB
* @license Apache-2.0
*/
import fs from 'fs';
import type {
MCPClientConfig,
MCPStats,
JsonRpcRequest,
JsonRpcResponse,
SearchDocumentsParams,
SearchSpeechesParams,
FetchMPsFilters,
FetchVotingFilters,
FetchVotingGroupFilters,
GovDocSearchParams,
RiksdagDocument,
} from '../types/mcp.js';
import { performPost } from './transport.js';
import { annotateDocumentTypes } from './document-types.js';
// ---------------------------------------------------------------------------
// Constants
// ---------------------------------------------------------------------------
const DEFAULT_MCP_SERVER_URL: string =
process.env['MCP_SERVER_URL'] ?? 'https://riksdag-regering-ai.onrender.com/mcp';
const DEFAULT_MAX_RETRIES = 3;
const RETRY_DELAY = 2000;
/** Timeout in milliseconds for fetching external URLs (GitHub, etc.) */
const EXTERNAL_URL_FETCH_TIMEOUT_MS = 15_000;
function getDefaultTimeout(): number {
const envVal = process.env['MCP_CLIENT_TIMEOUT_MS'];
return envVal ? (Number.parseInt(envVal, 10) || 30_000) : 30_000;
}
/**
* Resolve the default MCP auth token.
* Priority:
* 1. MCP_AUTH_TOKEN env var (strips "Bearer " prefix if present)
* 2. MCP_GATEWAY_API_KEY env var (raw API key)
* 3. gateway.apiKey from MCP config file (legacy — raw API key)
* 4. mcpServers['riksdag-regering'].headers.Authorization from MCP config file
* (raw API key — used as-is)
*
* The MCP gateway expects a raw API key (no "Bearer " prefix). If a legacy
* "Bearer <key>" value is stored in the config, the prefix is stripped
* automatically.
*/
function getDefaultAuthToken(): string {
Iif (process.env['MCP_AUTH_TOKEN']) return process.env['MCP_AUTH_TOKEN'].replace(/^Bearer\s+/i, '');
if (process.env['MCP_GATEWAY_API_KEY']) return process.env['MCP_GATEWAY_API_KEY'];
// Try reading from MCP config file
const configPath = process.env['GH_AW_MCP_CONFIG'] ?? '/home/runner/.copilot/mcp-config.json';
try {
if (fs.existsSync(configPath)) {
const raw = JSON.parse(fs.readFileSync(configPath, 'utf8')) as Record<string, unknown>;
// Priority 3: legacy gateway.apiKey
const gateway = raw['gateway'] as Record<string, unknown> | undefined;
const apiKey = gateway?.['apiKey'] as string | undefined;
if (apiKey) return apiKey.replace(/^Bearer\s+/i, '');
// Priority 4: mcpServers['riksdag-regering'].headers.Authorization
// Strip legacy "Bearer " prefix if present — gateway expects raw API key
const mcpServers = raw['mcpServers'] as Record<string, unknown> | undefined;
const rrServer = mcpServers?.['riksdag-regering'] as Record<string, unknown> | undefined;
const headers = rrServer?.['headers'] as Record<string, unknown> | undefined;
const authHeader = headers?.['Authorization'] as string | undefined;
if (authHeader) return authHeader.replace(/^Bearer\s+/i, '');
}
} catch {
// Config file read is best-effort — fall through to empty token
}
return '';
}
const DEFAULT_MCP_AUTH_TOKEN: string = getDefaultAuthToken();
let jsonRpcId = 1;
// ---------------------------------------------------------------------------
// MCPClient class
// ---------------------------------------------------------------------------
/**
* MCP (Model Context Protocol) client providing typed access to
* 32 riksdag-regering intelligence tools via JSON-RPC 2.0.
*/
export class MCPClient {
readonly baseURL: string;
readonly timeout: number;
readonly maxRetries: number;
readonly customHeaders: Readonly<Record<string, string>>;
readonly authToken: string;
requestCount: number;
errorCount: number;
sessionId: string | null;
constructor(config: MCPClientConfig | string = {}) {
if (typeof config === 'string') {
this.baseURL = config;
this.timeout = getDefaultTimeout();
this.maxRetries = DEFAULT_MAX_RETRIES;
this.customHeaders = {};
this.authToken = DEFAULT_MCP_AUTH_TOKEN;
} else {
this.baseURL = config.baseURL ?? config.serverUrl ?? DEFAULT_MCP_SERVER_URL;
this.timeout = config.timeout ?? getDefaultTimeout();
this.maxRetries = config.maxRetries ?? DEFAULT_MAX_RETRIES;
this.customHeaders = config.headers ?? {};
this.authToken = config.authToken ?? DEFAULT_MCP_AUTH_TOKEN;
}
this.requestCount = 0;
this.errorCount = 0;
this.sessionId = null;
}
// -----------------------------------------------------------------------
// Core request
// -----------------------------------------------------------------------
async request(
tool: string,
params: Record<string, unknown> = {},
retryCount = 0,
skipPrefix = false,
): Promise<Record<string, unknown>> {
if (!tool || typeof tool !== 'string' || !/^[a-zA-Z0-9_-]+$/.test(tool)) {
throw new Error(
`Invalid tool name: ${tool}. Tool names must contain only alphanumeric characters, hyphens, and underscores.`,
);
}
if (retryCount === 0 && !skipPrefix) {
this.requestCount++;
}
const controller = new AbortController();
const timeoutId = setTimeout(() => controller.abort(), this.timeout);
try {
const isGateway =
this.baseURL.includes('host.docker.internal') ||
this.baseURL.includes('/mcp/riksdag-regering');
const shouldPrefix = isGateway && !skipPrefix && !tool.includes('--');
const toolName = shouldPrefix ? `riksdag-regering--${tool}` : tool;
const jsonRpcRequest: JsonRpcRequest = {
jsonrpc: '2.0',
id: jsonRpcId++,
method: 'tools/call',
params: { name: toolName, arguments: params },
};
if (this.authToken && !this.sessionId) {
try {
await this.initializeSession();
} catch {
// Session init is optional
}
}
const headers: Record<string, string> = {
'Content-Type': 'application/json',
Accept: 'application/json, text/event-stream',
...this.customHeaders,
};
if (this.authToken) headers['Authorization'] = this.authToken;
Iif (this.sessionId) headers['Mcp-Session-Id'] = this.sessionId;
const response = await performPost(
this.baseURL,
headers,
JSON.stringify(jsonRpcRequest),
controller.signal,
);
if (!response.ok) {
let errorBody = '';
try {
errorBody = await response.text();
} catch {
// ignore
}
throw new Error(
`MCP server error: ${response.status} ${response.statusText}${errorBody ? ' - ' + errorBody : ''}`,
);
}
const contentType: string =
response.headers && typeof response.headers.get === 'function'
? (response.headers.get('content-type') ?? '')
: '';
let jsonRpcResponse: JsonRpcResponse;
Iif (contentType.includes('text/event-stream')) {
const text = await response.text();
jsonRpcResponse = this.parseSSEResponse(text);
} else {
jsonRpcResponse = (await response.json()) as JsonRpcResponse;
}
if (jsonRpcResponse.error) {
const errorMsg = jsonRpcResponse.error.message || JSON.stringify(jsonRpcResponse.error);
const isToolLookupError =
errorMsg.includes('not found') ||
errorMsg.includes('Internal error') ||
errorMsg.includes('Unknown tool') ||
errorMsg.includes('unknown tool');
if (isToolLookupError && toolName.startsWith('riksdag-regering--') && !skipPrefix) {
const bareTool = toolName.replace(/^riksdag-regering--/, '');
console.warn(`⚠️ Tool '${toolName}' not found, retrying as '${bareTool}'...`);
return this.request(bareTool, params, retryCount, true);
}
Iif (errorMsg.includes('session initialization') || errorMsg.includes('Too Many Requests')) {
this.sessionId = null;
if (retryCount < 2) {
const delay = (retryCount + 1) * 2000;
console.warn(`⚠️ Session error, re-initializing after ${delay}ms...`);
await new Promise<void>((r) => setTimeout(r, delay));
await this.initializeSession();
return this.request(tool, params, retryCount + 1, skipPrefix);
}
}
throw new Error(`MCP tool error: ${errorMsg}`);
}
const result = (jsonRpcResponse.result ?? {}) as Record<string, unknown>;
const content = result['content'] as Array<{ text?: string }> | undefined;
Iif (Array.isArray(content) && content[0]?.text) {
try {
const parsed = JSON.parse(content[0].text) as Record<string, unknown>;
if (parsed['payloadPath']) {
const fs = await import('fs');
const payloadRaw = JSON.parse(
fs.readFileSync(parsed['payloadPath'] as string, 'utf8'),
) as Record<string, unknown>;
const payloadContent = payloadRaw['content'] as Array<{ text?: string }> | undefined;
const payloadText = payloadContent?.[0]?.text;
if (payloadText) {
try {
return JSON.parse(payloadText) as Record<string, unknown>;
} catch {
return { text: payloadText };
}
}
return payloadRaw;
}
return parsed;
} catch {
return { text: content[0].text };
}
}
return result;
} catch (error: unknown) {
const err = error as Error;
const errorMsg = (err.message ?? '').toLowerCase();
if (
retryCount < this.maxRetries - 1 &&
(err.name === 'AbortError' ||
errorMsg.includes('network') ||
errorMsg.includes('econnrefused') ||
errorMsg.includes('connection closed') ||
errorMsg.includes('too many requests'))
) {
const delay = RETRY_DELAY * Math.pow(2, retryCount);
console.warn(
`⚠️ Request failed (${err.message.substring(0, 60)}), retrying after ${delay}ms (${retryCount + 1}/${this.maxRetries - 1})...`,
);
this.sessionId = null;
await this.sleep(delay);
return this.request(tool, params, retryCount + 1, skipPrefix);
}
this.errorCount++;
let errorMessage = `MCP request failed: ${err.message}`;
Iif (err.name === 'AbortError' || errorMsg.includes('timeout')) {
errorMessage += `\n\n💡 Troubleshooting tips:
- The MCP server may be cold starting (Render.com free tier)
- Try increasing timeout or waiting a few minutes
- Server URL: ${this.baseURL}
- Consider running workflow again in 5-10 minutes`;
} else if (
errorMsg.includes('network') ||
errorMsg.includes('econnrefused') ||
errorMsg.includes('fetch failed')
) {
errorMessage += `\n\n💡 Troubleshooting tips:
- Check if MCP server is accessible: ${this.baseURL}
- Verify network connectivity
- The server may be temporarily unavailable
- Try manual workflow dispatch with force_generation=true`;
}
throw new Error(errorMessage, { cause: error });
} finally {
clearTimeout(timeoutId);
}
}
// -----------------------------------------------------------------------
// Utilities
// -----------------------------------------------------------------------
async sleep(ms: number): Promise<void> {
return new Promise((resolve) => setTimeout(resolve, ms));
}
parseSSEResponse(text: string): JsonRpcResponse {
const lines = text.split('\n');
for (const line of lines) {
if (line.startsWith('data: ')) {
return JSON.parse(line.substring(6)) as JsonRpcResponse;
}
}
return JSON.parse(text) as JsonRpcResponse;
}
async initializeSession(): Promise<void> {
Iif (this.sessionId || !this.authToken) return;
const controller = new AbortController();
const timeoutId = setTimeout(() => controller.abort(), this.timeout);
try {
const headers: Record<string, string> = {
'Content-Type': 'application/json',
Accept: 'application/json, text/event-stream',
...this.customHeaders,
};
Eif (this.authToken) headers['Authorization'] = this.authToken;
const response = await performPost(
this.baseURL,
headers,
JSON.stringify({
jsonrpc: '2.0',
id: jsonRpcId++,
method: 'initialize',
params: {
protocolVersion: '2024-11-05',
capabilities: {},
clientInfo: { name: 'riksdagsmonitor-news', version: '1.0.0' },
},
}),
controller.signal,
);
Iif (!response.ok) {
throw new Error(`Session init failed: ${response.status} ${response.statusText}`);
}
const sessionId =
response.headers && typeof response.headers.get === 'function'
? response.headers.get('Mcp-Session-Id')
: null;
Iif (sessionId) {
this.sessionId = sessionId;
console.log(` 🔗 MCP session initialized: ${sessionId.substring(0, 8)}...`);
}
await performPost(
this.baseURL,
{
...headers,
...(this.sessionId ? { 'Mcp-Session-Id': this.sessionId } : {}),
},
JSON.stringify({
jsonrpc: '2.0',
method: 'notifications/initialized',
}),
controller.signal,
);
} finally {
clearTimeout(timeoutId);
}
}
// -----------------------------------------------------------------------
// Data-fetching methods
// -----------------------------------------------------------------------
async fetchCalendarEvents(
from: string,
tom: string,
org: string | null = null,
akt: string | null = null,
): Promise<unknown[]> {
const params: Record<string, unknown> = { from, tom };
if (org) params['org'] = org;
if (akt) params['akt'] = akt;
const response = await this.request('get_calendar_events', params);
return (response['kalender'] ?? response['events'] ?? []) as unknown[];
}
async fetchCommitteeReports(
limit = 10,
rm: string | null = null,
organ: string | null = null,
): Promise<unknown[]> {
const params: Record<string, unknown> = { limit };
if (rm) params['rm'] = rm;
if (organ) params['organ'] = organ;
const response = await this.request('get_betankanden', params);
return (response['dokument'] ?? response['reports'] ?? []) as unknown[];
}
async fetchPropositions(limit = 10, rm: string | null = null): Promise<unknown[]> {
const params: Record<string, unknown> = { limit };
if (rm) params['rm'] = rm;
const response = await this.request('get_propositioner', params);
return (response['dokument'] ?? response['propositions'] ?? []) as unknown[];
}
async fetchMotions(limit = 10, rm: string | null = null): Promise<unknown[]> {
const params: Record<string, unknown> = { limit };
if (rm) params['rm'] = rm;
const response = await this.request('get_motioner', params);
return (response['dokument'] ?? response['motions'] ?? []) as unknown[];
}
async fetchWrittenQuestions(params: { limit?: number; rm?: string } = {}): Promise<unknown[]> {
const reqParams: Record<string, unknown> = { limit: params.limit ?? 20 };
if (params.rm) reqParams['rm'] = params.rm;
const response = await this.request('get_fragor', reqParams);
return (response['dokument'] ?? response['questions'] ?? []) as unknown[];
}
async fetchInterpellations(params: { limit?: number; rm?: string } = {}): Promise<unknown[]> {
const reqParams: Record<string, unknown> = { limit: params.limit ?? 15 };
if (params.rm) reqParams['rm'] = params.rm;
const response = await this.request('get_interpellationer', reqParams);
return (response['dokument'] ?? response['interpellations'] ?? []) as unknown[];
}
async searchDocuments(searchParams: SearchDocumentsParams): Promise<unknown[]> {
const response = await this.request(
'search_dokument',
searchParams as unknown as Record<string, unknown>,
);
const raw = (response['dokument'] ?? response['documents'] ?? []) as unknown[];
return raw.map(d => annotateDocumentTypes(d as Record<string, unknown>));
}
async searchSpeeches(searchParams: SearchSpeechesParams): Promise<unknown[]> {
const response = await this.request(
'search_anforanden',
searchParams as unknown as Record<string, unknown>,
);
return (response['anforanden'] ?? response['speeches'] ?? []) as unknown[];
}
async fetchMPs(filters: FetchMPsFilters = {}): Promise<unknown[]> {
const response = await this.request(
'search_ledamoter',
filters as unknown as Record<string, unknown>,
);
return (response['mps'] ?? []) as unknown[];
}
async fetchVotingRecords(filters: FetchVotingFilters): Promise<unknown[]> {
const response = await this.request(
'search_voteringar',
filters as unknown as Record<string, unknown>,
);
return (response['votes'] ?? []) as unknown[];
}
async fetchVotingGroup(params: FetchVotingGroupFilters = {}): Promise<unknown[]> {
const response = await this.request(
'get_voting_group',
params as unknown as Record<string, unknown>,
);
// MCP server returns 'groups' when groupBy is provided (grouped results),
// or 'votes' when no grouping is applied (flat voting list fallback)
return (response['groups'] ?? response['votes'] ?? []) as unknown[];
}
async fetchGovernmentDocuments(searchParams: GovDocSearchParams): Promise<unknown[]> {
const response = await this.request(
'search_regering',
searchParams as unknown as Record<string, unknown>,
);
return (response['documents'] ?? []) as unknown[];
}
async fetchDocumentDetails(
dok_id: string,
include_full_text = true,
): Promise<Record<string, unknown>> {
const response = await this.request('get_dokument_innehall', {
dok_id,
include_full_text,
});
return response;
}
async enrichDocumentsWithContent(
documents: RiksdagDocument[],
concurrency = 3,
): Promise<RiksdagDocument[]> {
const safeConcurrency = Math.max(1, Math.floor(concurrency));
const enriched: RiksdagDocument[] = [];
for (let i = 0; i < documents.length; i += safeConcurrency) {
const batch = documents.slice(i, i + safeConcurrency);
const batchResults = await Promise.allSettled(
batch.map(async (doc): Promise<RiksdagDocument> => {
const dok_id = doc.dokumentnamn ?? doc.dok_id ?? doc.id;
if (!dok_id) {
console.warn('⚠️ Document missing ID:', doc);
return { ...doc, contentFetchError: 'No document ID' };
}
try {
const details = await this.fetchDocumentDetails(dok_id, false);
const intressent = (details['intressent'] ?? {}) as Record<string, string>;
const author = intressent['tilltalsnamn']
? `${intressent['tilltalsnamn']} ${intressent['efternamn']}`.trim()
: doc.intressent_namn ?? intressent['namn'] ?? 'Unknown';
const party = intressent['parti'] ?? doc.parti ?? 'Unknown';
const summary =
(details['summary'] as string) ??
doc.summary ??
(details['notis'] as string) ??
doc.notis ??
'';
return {
...doc,
...(details as Partial<RiksdagDocument>),
author,
parti: party,
intressent_namn: author,
summary,
contentFetched: true,
} as RiksdagDocument;
} catch (error: unknown) {
const errMsg = (error as Error).message;
console.error(`❌ Failed to enrich document ${dok_id}:`, errMsg);
return { ...doc, contentFetchError: errMsg };
}
}),
);
for (let idx = 0; idx < batchResults.length; idx++) {
const result = batchResults[idx]!;
if (result.status === 'fulfilled') {
enriched.push(result.value);
} else {
const failedDoc = batch[idx]!;
const failedDokId = failedDoc.dokumentnamn ?? failedDoc.dok_id ?? failedDoc.id ?? 'unknown';
console.error(`❌ Batch enrichment failed for document ${failedDokId}:`, result.reason);
enriched.push({ ...failedDoc, contentFetchError: (result.reason as Error).message });
}
}
if (i + safeConcurrency < documents.length) {
await new Promise<void>((resolve) => setTimeout(resolve, 200));
}
}
return enriched;
}
/**
* Fetch government document content from regeringen.se via g0v.se.
* Uses the get_g0v_document_content MCP tool to retrieve Markdown content.
*
* The g0v MCP tool response typically contains:
* - `content` (primary): Markdown content of the document
* - `markdown` (fallback): Alias used by some g0v API versions
* - `text` (fallback): Plain text content when Markdown is unavailable
*
* @param regeringenUrl - Full URL to a document on regeringen.se
* @returns Markdown content of the document, or null if unavailable
*/
async fetchGovernmentDocumentContent(
regeringenUrl: string,
): Promise<string | null> {
try {
const response = await this.request('get_g0v_document_content', {
regeringenUrl,
});
// g0v API returns content in 'content' field; 'markdown'/'text' are fallbacks
return (response['content'] ?? response['markdown'] ?? response['text'] ?? null) as string | null;
} catch (error: unknown) {
console.warn(`⚠️ Could not fetch government document content for ${regeringenUrl}: ${(error as Error).message}`);
return null;
}
}
/**
* Fetch raw text content from an external URL (e.g. GitHub raw, other public URLs).
* Performs a simple HTTP GET and returns the response body as text.
* Uses a 15-second timeout to avoid hanging on slow external resources.
*
* @param rawUrl - Full URL to fetch (must be publicly accessible)
* @returns Text content of the resource, or null if unavailable
*/
async fetchExternalUrlContent(rawUrl: string): Promise<string | null> {
try {
const controller = new AbortController();
const timeout = setTimeout(() => controller.abort(), EXTERNAL_URL_FETCH_TIMEOUT_MS);
const response = await fetch(rawUrl, {
signal: controller.signal,
headers: { 'Accept': 'text/plain, text/markdown, text/html, */*' },
});
clearTimeout(timeout);
if (!response.ok) {
console.warn(`⚠️ HTTP ${response.status} fetching external URL: ${rawUrl}`);
return null;
}
return await response.text();
} catch (error: unknown) {
console.warn(`⚠️ Could not fetch external URL ${rawUrl}: ${(error as Error).message}`);
return null;
}
}
// -----------------------------------------------------------------------
// Statistics
// -----------------------------------------------------------------------
getStats(): MCPStats {
return {
requests: this.requestCount,
errors: this.errorCount,
successRate:
this.requestCount > 0
? Math.round(((this.requestCount - this.errorCount) / this.requestCount) * 100) + '%'
: '0%',
};
}
resetStats(): void {
this.requestCount = 0;
this.errorCount = 0;
}
}
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