Add:Schedule periodic library scans #655

server/managers/CronManager.js

@@ -0,0 +1,61 @@
+const cron = require('../libs/nodeCron')
+const Logger = require('../Logger')
+
+class CronManager {
+  constructor(db, scanner) {
+    this.db = db
+    this.scanner = scanner
+
+    this.libraryScanCrons = []
+  }
+
+  init() {
+    this.initLibraryScanCrons()
+  }
+
+  initLibraryScanCrons() {
+    for (const library of this.db.libraries) {
+      if (library.settings.autoScanCronExpression) {
+        this.startCronForLibrary(library)
+      }
+    }
+  }
+
+  startCronForLibrary(library) {
+    Logger.debug(`[CronManager] Init library scan cron for ${library.name} on schedule ${library.settings.autoScanCronExpression}`)
+    const libScanCron = cron.schedule(library.settings.autoScanCronExpression, () => {
+      Logger.debug(`[CronManager] Library scan cron executing for ${library.name}`)
+      this.scanner.scan(library)
+    })
+    this.libraryScanCrons.push({
+      libraryId: library.id,
+      expression: library.settings.autoScanCronExpression,
+      task: libScanCron
+    })
+  }
+
+  removeCronForLibrary(library) {
+    Logger.debug(`[CronManager] Removing library scan cron for ${library.name}`)
+    this.libraryScanCrons = this.libraryScanCrons.filter(lsc => lsc.libraryId !== library.id)
+  }
+
+  updateLibraryScanCron(library) {
+    const expression = library.settings.autoScanCronExpression
+    const existingCron = this.libraryScanCrons.find(lsc => lsc.libraryId === library.id)
+
+    if (!expression && existingCron) {
+      if (existingCron.task.stop) existingCron.task.stop()
+
+      this.removeCronForLibrary(library)
+    } else if (!existingCron && expression) {
+      this.startCronForLibrary(library)
+    } else if (existingCron && existingCron.expression !== expression) {
+      if (existingCron.task.stop) existingCron.task.stop()
+
+      this.removeCronForLibrary(library)
+      this.startCronForLibrary(library)
+    }
+  }
+
+}
+module.exports = CronManager