add: named daily database copies for automating exports

lib/database.js

@@ -1,5 +1,6 @@
 const sqlite = require('sqlite3')
 
+const config = require('../config')
 const { TimeTracker } = require('./time')
 
 class Database {
@@ -8,6 +9,32 @@ class Database {
     this._sql = new sqlite.Database('database.sql')
   }
 
+  getDailyDatabase () {
+    if (!config.createDailyDatabaseCopy) {
+      return
+    }
+
+    const date = new Date()
+    const fileName = `database_copy_${date.getDate()}-${date.getMonth() + 1}-${date.getFullYear()}.sql`
+
+    if (fileName !== this._currentDatabaseCopyFileName) {
+      if (this._currentDatabaseCopyInstance) {
+        this._currentDatabaseCopyInstance.close()
+      }
+
+      this._currentDatabaseCopyInstance = new sqlite.Database(fileName)
+      this._currentDatabaseCopyFileName = fileName
+
+      // Ensure the initial tables are created
+      // This does not created indexes since it is only inserted to
+      this._currentDatabaseCopyInstance.serialize(() => {
+        this._currentDatabaseCopyInstance.run('CREATE TABLE IF NOT EXISTS pings (timestamp BIGINT NOT NULL, ip TINYTEXT, playerCount MEDIUMINT)')
+      })
+    }
+
+    return this._currentDatabaseCopyInstance
+  }
+
   ensureIndexes () {
     this._sql.serialize(() => {
       this._sql.run('CREATE TABLE IF NOT EXISTS pings (timestamp BIGINT NOT NULL, ip TINYTEXT, playerCount MEDIUMINT)')
@@ -122,7 +149,18 @@ class Database {
   }
 
   insertPing (ip, timestamp, unsafePlayerCount) {
-    const statement = this._sql.prepare('INSERT INTO pings (timestamp, ip, playerCount) VALUES (?, ?, ?)')
+    this._insertPingTo(ip, timestamp, unsafePlayerCount, this._sql)
+
+    // Push a copy of the data into the database copy, if any
+    // This creates an "insert only" copy of the database for archiving
+    const dailyDatabase = this.getDailyDatabase()
+    if (dailyDatabase) {
+      this._insertPingTo(ip, timestamp, unsafePlayerCount, dailyDatabase)
+    }
+  }
+
+  _insertPingTo (ip, timestamp, unsafePlayerCount, db) {
+    const statement = db.prepare('INSERT INTO pings (timestamp, ip, playerCount) VALUES (?, ?, ?)')
     statement.run(timestamp, ip, unsafePlayerCount)
     statement.finalize()
   }