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// SPDX-License-Identifier: Apache-2.0
/**
* @module MCP/EPMCPClient
* @description Client for connecting to European-Parliament-MCP-Server.
* Communicates via JSON-RPC 2.0 over stdio with retry logic.
*/
import { spawn, type ChildProcess } from 'child_process';
import { resolve, dirname } from 'path';
import { fileURLToPath } from 'url';
import type {
MCPClientOptions,
MCPToolResult,
JSONRPCRequest,
JSONRPCResponse,
PendingRequest,
GetMEPsOptions,
GetPlenarySessionsOptions,
SearchDocumentsOptions,
GetParliamentaryQuestionsOptions,
GetCommitteeInfoOptions,
MonitorLegislativePipelineOptions,
AssessMEPInfluenceOptions,
AnalyzeCoalitionDynamicsOptions,
DetectVotingAnomaliesOptions,
ComparePoliticalGroupsOptions,
VotingRecordsOptions,
VotingPatternsOptions,
GenerateReportOptions,
AnalyzeLegislativeEffectivenessOptions,
} from '../types/index.js';
/** npm binary name for the European Parliament MCP server */
const BINARY_NAME = 'european-parliament-mcp-server';
/** Platform-specific binary filename (Windows uses .cmd shim) */
const BINARY_FILE = process.platform === 'win32' ? `${BINARY_NAME}.cmd` : BINARY_NAME;
/** Default binary resolved from node_modules/.bin relative to this file's compiled location */
const DEFAULT_SERVER_BINARY = resolve(
dirname(fileURLToPath(import.meta.url)),
`../../node_modules/.bin/${BINARY_FILE}`
);
/** Request timeout in milliseconds */
const REQUEST_TIMEOUT_MS = 30000;
/** Connection startup delay in milliseconds */
const CONNECTION_STARTUP_DELAY_MS = 500;
/** Fallback payload for analyze_legislative_effectiveness when validation fails or tool is unavailable */
const EFFECTIVENESS_FALLBACK = '{"effectiveness": null}';
/**
* MCP Client for European Parliament data access
*/
export class EuropeanParliamentMCPClient {
private serverPath: string;
private connected: boolean;
private process: ChildProcess | null;
private requestId: number;
private pendingRequests: Map<number, PendingRequest>;
private connectionAttempts: number;
private maxConnectionAttempts: number;
private connectionRetryDelay: number;
constructor(options: MCPClientOptions = {}) {
this.serverPath =
options.serverPath ?? process.env['EP_MCP_SERVER_PATH'] ?? DEFAULT_SERVER_BINARY;
this.connected = false;
this.process = null;
this.requestId = 0;
this.pendingRequests = new Map();
this.connectionAttempts = 0;
this.maxConnectionAttempts = options.maxConnectionAttempts ?? 3;
this.connectionRetryDelay = options.connectionRetryDelay ?? 1000;
}
/**
* Check if client is connected
*
* @returns Connection status
*/
isConnected(): boolean {
return this.connected;
}
/**
* Connect to the MCP server with retry logic
*/
async connect(): Promise<void> {
if (this.connected) {
return;
}
console.log('🔌 Connecting to European Parliament MCP Server...');
this.connectionAttempts = 0;
while (this.connectionAttempts < this.maxConnectionAttempts) {
try {
await this._attemptConnection();
this.connectionAttempts = 0; // Reset on success
return;
} catch (error) {
this.connectionAttempts++;
if (this.connectionAttempts < this.maxConnectionAttempts) {
const delay = this.connectionRetryDelay * Math.pow(2, this.connectionAttempts - 1);
console.warn(
`⚠️ Connection attempt ${this.connectionAttempts} failed. Retrying in ${delay}ms...`
);
await new Promise((resolve) => setTimeout(resolve, delay));
} else {
console.error(
'❌ Failed to connect to MCP server after',
this.maxConnectionAttempts,
'attempts'
);
throw error;
}
}
}
}
/**
* Attempt a single connection
*/
private async _attemptConnection(): Promise<void> {
try {
const isJavaScriptFile: boolean = this.serverPath.toLowerCase().endsWith('.js');
const command: string = isJavaScriptFile ? process.execPath : this.serverPath;
const args: string[] = isJavaScriptFile ? [this.serverPath] : [];
this.process = spawn(command, args, {
stdio: ['pipe', 'pipe', 'pipe'],
});
let buffer = '';
let startupError: Error | null = null;
this.process.stdout?.on('data', (data: Buffer) => {
buffer += data.toString();
const lines = buffer.split('\n');
buffer = lines.pop() ?? '';
for (const line of lines) {
if (line.trim()) {
this.handleMessage(line);
}
}
});
this.process.stderr?.on('data', (data: Buffer) => {
const message = data.toString().trim();
Eif (message) {
console.error(`MCP Server: ${message}`);
}
});
this.process.on('close', (code: number | null) => {
console.log(`MCP Server exited with code ${code}`);
this.connected = false;
for (const [id, { reject }] of this.pendingRequests.entries()) {
reject(new Error('MCP server connection closed'));
this.pendingRequests.delete(id);
}
});
this.process.on('error', (err: Error) => {
startupError = err;
this.connected = false;
});
await new Promise((resolve) => setTimeout(resolve, CONNECTION_STARTUP_DELAY_MS));
Iif (startupError) {
throw startupError;
}
this.connected = true;
console.log('✅ Connected to European Parliament MCP Server');
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.error('❌ Failed to spawn MCP server:', message);
throw error;
}
}
/**
* Disconnect from the MCP server
*/
disconnect(): void {
if (this.process) {
this.process.kill();
this.process = null;
}
this.connected = false;
}
/**
* Handle incoming messages from MCP server
*
* @param line - JSON message line from server
*/
handleMessage(line: string): void {
try {
const message = JSON.parse(line) as JSONRPCResponse;
if (message.id && this.pendingRequests.has(message.id)) {
const pending = this.pendingRequests.get(message.id)!;
this.pendingRequests.delete(message.id);
if (message.error) {
pending.reject(new Error(message.error.message ?? 'MCP server error'));
} else {
pending.resolve(message.result);
}
} else if (!message.id && message.method) {
console.log(`MCP Notification: ${message.method}`);
}
} catch (error) {
const errorMessage = error instanceof Error ? error.message : String(error);
console.error('Error parsing MCP message:', errorMessage);
console.error('Problematic line:', line);
}
}
/**
* Send a request to the MCP server
*
* @param method - RPC method name
* @param params - Method parameters
* @returns Server response
*/
async sendRequest(method: string, params: Record<string, unknown> = {}): Promise<unknown> {
if (!this.connected) {
throw new Error('Not connected to MCP server');
}
const id = ++this.requestId;
const request: JSONRPCRequest = {
jsonrpc: '2.0',
id,
method,
params,
};
return await new Promise((resolve, reject) => {
this.pendingRequests.set(id, { resolve, reject });
const message = JSON.stringify(request) + '\n';
this.process?.stdin?.write(message);
setTimeout(() => {
if (this.pendingRequests.has(id)) {
this.pendingRequests.delete(id);
reject(new Error('Request timeout'));
}
}, REQUEST_TIMEOUT_MS);
});
}
/**
* List available MCP tools
*
* @returns List of available tools
*/
async listTools(): Promise<unknown> {
return await this.sendRequest('tools/list');
}
/**
* Call an MCP tool
*
* @param name - Tool name
* @param args - Tool arguments (must be a plain object, non-null, not an array)
* @returns Tool execution result
*/
async callTool(name: string, args: object = {}): Promise<MCPToolResult> {
if (args === null || Array.isArray(args) || typeof args !== 'object') {
throw new TypeError(
'MCP tool arguments must be a plain object (non-null object, not an array or function)'
);
}
return (await this.sendRequest('tools/call', { name, arguments: args })) as MCPToolResult;
}
/**
* Get Members of European Parliament
*
* @param options - Filter options
* @returns List of MEPs
*/
async getMEPs(options: GetMEPsOptions = {}): Promise<MCPToolResult> {
try {
return await this.callTool('get_meps', options);
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('get_meps not available:', message);
return { content: [{ type: 'text', text: '{"meps": []}' }] };
}
}
/**
* Get plenary sessions
*
* @param options - Filter options. `dateFrom` is mapped to `startDate` and `dateTo` to `endDate`
* per the tool schema when the canonical fields are absent.
* @returns Plenary sessions data
*/
async getPlenarySessions(options: GetPlenarySessionsOptions = {}): Promise<MCPToolResult> {
try {
const { dateFrom, dateTo, ...rest } = options;
const normalizedOptions: Record<string, unknown> = { ...rest };
if (normalizedOptions['startDate'] === undefined && dateFrom !== undefined) {
normalizedOptions['startDate'] = dateFrom;
}
if (normalizedOptions['endDate'] === undefined && dateTo !== undefined) {
normalizedOptions['endDate'] = dateTo;
}
return await this.callTool('get_plenary_sessions', normalizedOptions);
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('get_plenary_sessions not available:', message);
return { content: [{ type: 'text', text: '{"sessions": []}' }] };
}
}
/**
* Search legislative documents
*
* @param options - Search options (normalizes `keyword` to `query` if `query` is absent)
* @returns Search results
*/
async searchDocuments(options: SearchDocumentsOptions = {}): Promise<MCPToolResult> {
try {
const { keyword, ...rest } = options;
const normalizedOptions: Record<string, unknown> = { ...rest };
if (normalizedOptions['query'] === undefined && keyword !== undefined) {
const trimmed = String(keyword).trim();
Eif (trimmed.length > 0) {
normalizedOptions['query'] = trimmed;
}
}
return await this.callTool('search_documents', normalizedOptions);
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('search_documents not available:', message);
return { content: [{ type: 'text', text: '{"documents": []}' }] };
}
}
/**
* Get parliamentary questions
*
* @param options - Filter options. `dateFrom` is mapped to `startDate` per the tool schema.
* `dateTo` is intentionally ignored because the `get_parliamentary_questions` tool schema
* only supports `startDate` as a date filter; passing `dateTo` would have no effect.
* @returns Parliamentary questions data
*/
async getParliamentaryQuestions(
options: GetParliamentaryQuestionsOptions = {}
): Promise<MCPToolResult> {
try {
const { dateFrom, dateTo: _dateTo, ...rest } = options;
const toolOptions: Record<string, unknown> = { ...rest };
if (toolOptions['startDate'] === undefined && dateFrom !== undefined) {
toolOptions['startDate'] = dateFrom;
}
return await this.callTool('get_parliamentary_questions', toolOptions);
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('get_parliamentary_questions not available:', message);
return { content: [{ type: 'text', text: '{"questions": []}' }] };
}
}
/**
* Get committee information
*
* @param options - Filter options
* @returns Committee info data
*/
async getCommitteeInfo(options: GetCommitteeInfoOptions = {}): Promise<MCPToolResult> {
try {
return await this.callTool('get_committee_info', options);
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('get_committee_info not available:', message);
return { content: [{ type: 'text', text: '{"committees": []}' }] };
}
}
/**
* Monitor legislative pipeline
*
* @param options - Filter options
* @returns Legislative pipeline data
*/
async monitorLegislativePipeline(
options: MonitorLegislativePipelineOptions = {}
): Promise<MCPToolResult> {
try {
return await this.callTool('monitor_legislative_pipeline', options);
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('monitor_legislative_pipeline not available:', message);
return { content: [{ type: 'text', text: '{"procedures": []}' }] };
}
}
/**
* Analyze legislative effectiveness of an MEP or committee
*
* @param options - Options including subjectType and subjectId
* @returns Legislative effectiveness data
*/
async analyzeLegislativeEffectiveness(
options: AnalyzeLegislativeEffectivenessOptions
): Promise<MCPToolResult> {
const { subjectType, subjectId } = options;
if (subjectId.trim().length === 0) {
console.warn(
'analyze_legislative_effectiveness called without valid subjectId (non-empty string required)'
);
return { content: [{ type: 'text', text: EFFECTIVENESS_FALLBACK }] };
}
const trimmedSubjectId = subjectId.trim();
try {
return await this.callTool('analyze_legislative_effectiveness', {
...options,
subjectType,
subjectId: trimmedSubjectId,
});
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('analyze_legislative_effectiveness not available:', message);
return { content: [{ type: 'text', text: EFFECTIVENESS_FALLBACK }] };
}
}
/**
* Assess MEP influence using 5-dimension scoring model
*
* @param options - Options including required mepId and optional date range
* @returns MEP influence score and breakdown
*/
async assessMEPInfluence(options: AssessMEPInfluenceOptions): Promise<MCPToolResult> {
const trimmedMepId = options && typeof options.mepId === 'string' ? options.mepId.trim() : '';
if (trimmedMepId.length === 0) {
console.warn('assess_mep_influence called without valid mepId (non-empty string required)');
return { content: [{ type: 'text', text: '{"influence": {}}' }] };
}
try {
return await this.callTool('assess_mep_influence', { ...options, mepId: trimmedMepId });
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('assess_mep_influence not available:', message);
return { content: [{ type: 'text', text: '{"influence": {}}' }] };
}
}
/**
* Analyze coalition dynamics and cohesion
*
* @param options - Options including optional political groups and date range
* @returns Coalition cohesion and stress analysis
*/
async analyzeCoalitionDynamics(
options: AnalyzeCoalitionDynamicsOptions = {}
): Promise<MCPToolResult> {
try {
return await this.callTool('analyze_coalition_dynamics', options);
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('analyze_coalition_dynamics not available:', message);
return { content: [{ type: 'text', text: '{"coalitions": []}' }] };
}
}
/**
* Detect voting anomalies and party defections
*
* @param options - Options including optional MEP id, political group, and date
* @returns Anomaly detection results
*/
async detectVotingAnomalies(options: DetectVotingAnomaliesOptions = {}): Promise<MCPToolResult> {
try {
return await this.callTool('detect_voting_anomalies', options);
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('detect_voting_anomalies not available:', message);
return { content: [{ type: 'text', text: '{"anomalies": []}' }] };
}
}
/**
* Compare political groups across dimensions
*
* @param options - Options including required groups and optional metrics and date
* @returns Cross-group comparative analysis
*/
async comparePoliticalGroups(options: ComparePoliticalGroupsOptions): Promise<MCPToolResult> {
const rawGroups = options && Array.isArray(options.groups) ? options.groups : [];
const groups = rawGroups
.map((g) => (typeof g === 'string' ? g.trim() : ''))
.filter((g) => g.length > 0);
if (groups.length === 0) {
console.warn(
'compare_political_groups called without valid groups (non-empty string array required)'
);
return { content: [{ type: 'text', text: '{"comparison": {}}' }] };
}
try {
return await this.callTool('compare_political_groups', { ...options, groups });
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('compare_political_groups not available:', message);
return { content: [{ type: 'text', text: '{"comparison": {}}' }] };
}
}
/**
* Get detailed information about a specific MEP
*
* @param id - MEP identifier (must be non-empty)
* @returns Detailed MEP information including biography, contact, and activities
*/
async getMEPDetails(id: string): Promise<MCPToolResult> {
if (typeof id !== 'string' || id.trim().length === 0) {
console.warn('get_mep_details called without valid id (non-empty string required)');
return { content: [{ type: 'text', text: '{"mep": null}' }] };
}
try {
return await this.callTool('get_mep_details', { id: id.trim() });
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('get_mep_details not available:', message);
return { content: [{ type: 'text', text: '{"mep": null}' }] };
}
}
/**
* Retrieve voting records with optional filters
*
* @param options - Filter options (mepId, sessionId, limit)
* @returns Voting records data
*/
async getVotingRecords(options: VotingRecordsOptions = {}): Promise<MCPToolResult> {
try {
return await this.callTool('get_voting_records', options);
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('get_voting_records not available:', message);
return { content: [{ type: 'text', text: '{"votes": []}' }] };
}
}
/**
* Analyze voting behavior patterns for an MEP
*
* @param options - Analysis options (mepId required non-empty, dateFrom, compareWithGroup)
* @returns Voting pattern analysis
*/
async analyzeVotingPatterns(options: VotingPatternsOptions): Promise<MCPToolResult> {
if (typeof options.mepId !== 'string' || options.mepId.trim().length === 0) {
console.warn(
'analyze_voting_patterns called without valid mepId (non-empty string required)'
);
return { content: [{ type: 'text', text: '{"patterns": null}' }] };
}
try {
return await this.callTool('analyze_voting_patterns', {
...options,
mepId: options.mepId.trim(),
});
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('analyze_voting_patterns not available:', message);
return { content: [{ type: 'text', text: '{"patterns": null}' }] };
}
}
/**
* Track a legislative procedure by its identifier
*
* @param procedureId - Legislative procedure identifier (must be non-empty)
* @returns Procedure status and timeline
*/
async trackLegislation(procedureId: string): Promise<MCPToolResult> {
if (typeof procedureId !== 'string' || procedureId.trim().length === 0) {
console.warn(
'track_legislation called without valid procedureId (non-empty string required)'
);
return { content: [{ type: 'text', text: '{"procedure": null}' }] };
}
try {
return await this.callTool('track_legislation', { procedureId: procedureId.trim() });
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('track_legislation not available:', message);
return { content: [{ type: 'text', text: '{"procedure": null}' }] };
}
}
/**
* Generate an analytical report
*
* @param options - Report options (reportType required non-empty, subjectId, dateFrom)
* @returns Generated report data
*/
async generateReport(options: GenerateReportOptions): Promise<MCPToolResult> {
if (typeof options.reportType !== 'string' || options.reportType.trim().length === 0) {
console.warn('generate_report called without valid reportType (non-empty string required)');
return { content: [{ type: 'text', text: '{"report": null}' }] };
}
try {
return await this.callTool('generate_report', {
...options,
reportType: options.reportType.trim(),
});
} catch (error) {
const message = error instanceof Error ? error.message : String(error);
console.warn('generate_report not available:', message);
return { content: [{ type: 'text', text: '{"report": null}' }] };
}
}
}
// Singleton instance management
let clientInstance: EuropeanParliamentMCPClient | null = null;
/**
* Get or create singleton MCP client instance
*
* @param options - Client options
* @returns Connected MCP client
*/
export async function getEPMCPClient(
options: MCPClientOptions = {}
): Promise<EuropeanParliamentMCPClient> {
if (!clientInstance) {
clientInstance = new EuropeanParliamentMCPClient(options);
await clientInstance.connect();
}
return clientInstance;
}
/**
* Close and cleanup singleton MCP client
*/
export async function closeEPMCPClient(): Promise<void> {
if (clientInstance) {
clientInstance.disconnect();
clientInstance = null;
}
}
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