Add /misc/server/statistics route

Signed-off-by: Fred Boniface <fred@fjla.uk>

src/services/stats.services.js

@@ -1,4 +1,3 @@
-/* global process */
 const log    = require('../utils/log.utils');          // Log Helper
 const db     = require('../services/dbAccess.services');
 const os     = require('os');
@@ -54,7 +53,84 @@ async function versions() {
   return data;
 }
 
+async function statistics() {
+  log.out('statsServices.statistics: Fetching statistics', 'info');
+
+  const countersPromise = db.query('meta', { target: 'counters' });
+  const timetablePromise = db.query('meta', { target: 'timetable' });
+  const pisPromise = db.query('meta', { target: 'pis' });
+  const corpusPromise = db.query('meta', { target: 'corpus' });
+  const reasonCodesPromise = db.query('meta', { target: 'reasonCodes' });
+
+  const lengthUsersPromise = db.colCount('users');
+  const lengthRegistrationsPromise = db.colCount('registrations');
+  const lengthCorpusPromise = db.colCount('corpus');
+  const lengthStationsPromise = db.colCount('stations');
+  const lengthPisPromise = db.colCount('pis');
+  const lengthTimetablePromise = db.colCount('timetable');
+  const lengthReasonCodesPromise = db.colCount('reasonCodes');
+
+  const [
+    counters,
+    timetable,
+    pis,
+    corpus,
+    reasonCodes,
+    lengthUsers,
+    lengthRegistrations,
+    lengthCorpus,
+    lengthStations,
+    lengthPis,
+    lengthTimetable,
+    lengthReasonCodes
+  ] = await Promise.all([
+    countersPromise,
+    timetablePromise,
+    pisPromise,
+    corpusPromise,
+    reasonCodesPromise,
+    lengthUsersPromise,
+    lengthRegistrationsPromise,
+    lengthCorpusPromise,
+    lengthStationsPromise,
+    lengthPisPromise,
+    lengthTimetablePromise,
+    lengthReasonCodesPromise
+  ]);
+
+  return {
+    hostname: os.hostname() || 'Unknown',
+    runtimeMode: process.env.NODE_ENV || 'Unknown',
+    updateTimes: {
+      timetable: timetable[0]['updated'],
+      pis: pis[0]['updated'],
+      corpus: corpus[0]['updated'],
+      reasonCodes: reasonCodes[0]['updated']
+    },
+    requestCounts: {
+      ldbws_api: counters[0]['ldbws'] || 0,
+      lsbsvws_api: counters[0]['ldbsvws'] || 0,
+      corpus_api: counters[0]['corpus_api'] || 0,
+      timetable_db: counters[0]['timetable'] || 0,
+      pis_db: counters[0]['pis'] || 0,
+      corpus_db: counters[0]['corpus'] || 0,
+      stations_db: counters[0]['stations'] || 0
+    },
+    dbLengths: {
+      users: lengthUsers,
+      registrations: lengthRegistrations,
+      corpus: lengthCorpus,
+      stations: lengthStations,
+      pis: lengthPis,
+      timetable: lengthTimetable,
+      reasonCodes: lengthReasonCodes
+    },
+  };
+}
+
+
 module.exports = {
   hits,
-  versions
+  versions,
+  statistics
 };