Backend cleanup (#146)

* Add ServerRegistration, begin refactoring to match frontend * move graphData logic into ServerRegistration * move ping updates/history into ServerRegistration * start updating main app entry methods * fix default rates.updateMojangStatus * fix record loading delays on freshly booted instances * move database loading logic to method + callback * use data in frontend for type lookup instead of ping * cleanup app.js * reorganize methods to improve flow * avoid useless mojang updates, remove legacy fields * rename legacy fields for consistency * finish restructure around App model * ensure versions are sorted by release order * filter errors sent to frontend to avoid data leaks * fix version listing behavior on frontend * 5.1.0
2020-04-21 17:59:53 -05:00
parent 9eda8d6bdb
commit 4d13965e6b
19 changed files with 822 additions and 823 deletions
--- a/lib/app.js
+++ b/lib/app.js
@ -0,0 +1,92 @@
+const Database = require('./database')
+const MojangUpdater = require('./mojang')
+const PingController = require('./ping')
+const Server = require('./server')
+
+const config = require('../config')
+const minecraftVersions = require('../minecraft_versions')
+
+class App {
+  serverRegistrations = []
+
+  constructor () {
+    this.mojangUpdater = new MojangUpdater(this)
+    this.pingController = new PingController(this)
+    this.server = new Server(this.handleClientConnection)
+  }
+
+  loadDatabase (callback) {
+    this.database = new Database(this)
+
+    // Setup database instance
+    this.database.ensureIndexes()
+
+    this.database.loadGraphPoints(config.graphDuration, () => {
+      this.database.loadRecords(callback)
+    })
+  }
+
+  handleReady () {
+    this.server.listen(config.site.ip, config.site.port)
+
+    // Allow individual modules to manage their own task scheduling
+    this.mojangUpdater.schedule()
+    this.pingController.schedule()
+  }
+
+  handleClientConnection = (client) => {
+    if (config.logToDatabase) {
+      client.on('requestHistoryGraph', () => {
+        // Send historical graphData built from all serverRegistrations
+        const graphData = {}
+        const graphPeaks = {}
+
+        this.serverRegistrations.forEach((serverRegistration) => {
+          graphData[serverRegistration.data.name] = serverRegistration.graphData
+
+          // Send current peak, if any
+          const graphPeak = serverRegistration.getGraphPeak()
+          if (graphPeak) {
+            graphPeaks[serverRegistration.data.name] = graphPeak
+          }
+        })
+
+        // Send current peaks, if any
+        // Emit peaks first since graphData may take a while to receive
+        if (Object.keys(graphPeaks).length > 0) {
+          client.emit('peaks', graphPeaks)
+        }
+
+        client.emit('historyGraph', graphData)
+      })
+    }
+
+    client.emit('setPublicConfig', (() => {
+      // Remap minecraftVersion entries into name values
+      const minecraftVersionNames = {}
+      Object.keys(minecraftVersions).forEach(function (key) {
+        minecraftVersionNames[key] = minecraftVersions[key].map(version => version.name)
+      })
+
+      // Send configuration data for rendering the page
+      return {
+        graphDuration: config.graphDuration,
+        servers: this.serverRegistrations.map(serverRegistration => serverRegistration.data),
+        minecraftVersions: minecraftVersionNames,
+        isGraphVisible: config.logToDatabase
+      }
+    })())
+
+    // Send last Mojang update, if any
+    this.mojangUpdater.sendLastUpdate(client)
+
+    // Send pingHistory of all ServerRegistrations
+    client.emit('add', this.serverRegistrations.map(serverRegistration => serverRegistration.getPingHistory()))
+
+    // Always send last
+    // This tells the frontend to do final processing and render
+    client.emit('syncComplete')
+  }
+}
+
+module.exports = App