@ansvar/singapore-law-mcp/dist/api/health.js

Complete Singapore law database — 523 Acts, 28K+ provisions from Singapore Statutes Online (sso.agc.gov.sg) with full-text search, definitions, and citation support

import Database from '@ansvar/mcp-sqlite';
import { existsSync, copyFileSync, rmSync, statSync, writeFileSync } from 'fs';
import { join } from 'path';
import { REPOSITORY_URL, SERVER_NAME, SERVER_VERSION, DB_ENV_VAR, } from '../src/constants.js';
const SOURCE_DB = process.env[DB_ENV_VAR] || join(process.cwd(), 'data', 'database.db');
const TMP_DB = '/tmp/database.db';
const TMP_DB_META = '/tmp/database.db.meta.json';
const STALENESS_THRESHOLD_DAYS = 30;
function getHealthDb() {
    try {
        if (!existsSync(TMP_DB) && existsSync(SOURCE_DB)) {
            rmSync('/tmp/database.db.lock', { recursive: true, force: true });
            copyFileSync(SOURCE_DB, TMP_DB);
            const stats = statSync(SOURCE_DB);
            writeFileSync(TMP_DB_META, JSON.stringify({ source_db: SOURCE_DB, source_signature: `${stats.size}:${Math.trunc(stats.mtimeMs)}` }), 'utf-8');
        }
        if (existsSync(TMP_DB)) {
            return new Database(TMP_DB, { readonly: true });
        }
    }
    catch {
        // DB not available
    }
    return null;
}
function readMeta(db, key) {
    try {
        const row = db.prepare('SELECT value FROM db_metadata WHERE key = ?').get(key);
        return row?.value ?? null;
    }
    catch {
        return null;
    }
}
function safeCount(db, sql) {
    try {
        const row = db.prepare(sql).get();
        return row ? Number(row.count) : 0;
    }
    catch {
        return 0;
    }
}
export default function handler(req, res) {
    const url = new URL(req.url ?? '/', `https://${req.headers.host}`);
    if (url.pathname === '/version' || url.searchParams.has('version')) {
        res.status(200).json({
            name: SERVER_NAME,
            version: SERVER_VERSION,
            node_version: process.version,
            transport: ['stdio', 'streamable-http'],
            capabilities: ['statutes', 'eu_cross_references'],
            tier: 'free',
            source_schema_version: '1.0',
            repo_url: REPOSITORY_URL,
            report_issue_url: `${REPOSITORY_URL}/issues/new?template=data-error.md`,
        });
        return;
    }
    const db = getHealthDb();
    let dataStatus = 'degraded';
    let builtAt = null;
    let daysSinceBuilt = null;
    let tier = 'free';
    let schemaVersion = 'unknown';
    let counts = {};
    if (db) {
        try {
            builtAt = readMeta(db, 'built_at');
            tier = readMeta(db, 'tier') ?? 'free';
            schemaVersion = readMeta(db, 'schema_version') ?? 'unknown';
            if (builtAt) {
                daysSinceBuilt = Math.floor((Date.now() - new Date(builtAt).getTime()) / (1000 * 60 * 60 * 24));
                dataStatus = daysSinceBuilt > STALENESS_THRESHOLD_DAYS ? 'stale' : 'ok';
            }
            counts = {
                documents: safeCount(db, 'SELECT COUNT(*) as count FROM legal_documents'),
                provisions: safeCount(db, 'SELECT COUNT(*) as count FROM legal_provisions'),
            };
        }
        finally {
            db.close();
        }
    }
    res.status(200).json({
        status: dataStatus,
        server: SERVER_NAME,
        version: SERVER_VERSION,
        uptime_seconds: Math.floor(process.uptime()),
        data: {
            built_at: builtAt,
            days_since_built: daysSinceBuilt,
            staleness_threshold_days: STALENESS_THRESHOLD_DAYS,
            schema_version: schemaVersion,
            counts,
        },
        capabilities: ['statutes', 'eu_cross_references'],
        tier,
    });
}
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