Add counting some events

src/monitoring/eventhandler.ts

@@ -0,0 +1,22 @@
+/*
+ * server component for the TimeLimit App
+ * Copyright (C) 2019 - 2020 Jonas Lochmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+export interface EventHandler {
+  countEvent (name: string): void
+  getCounters (): Promise<{[key: string]: number}>
+  resetCounters (): Promise<void>
+}

src/monitoring/inmemoryeventhandler.ts

@@ -0,0 +1,43 @@
+/*
+ * server component for the TimeLimit App
+ * Copyright (C) 2019 - 2020 Jonas Lochmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import { EventHandler } from './eventhandler'
+
+export class InMemoryEventHandler implements EventHandler {
+  private counters = new Map<string, number>()
+
+  countEvent (name: string) {
+    this.counters.set(
+      name,
+      (this.counters.get(name) || 0) + 1
+    )
+  }
+
+  async getCounters () {
+    const result: {[key: string]: number} = {}
+
+    this.counters.forEach((value, key) => {
+      result[key] = value
+    })
+
+    return result
+  }
+
+  async resetCounters () {
+    this.counters.clear()
+  }
+}