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node_modules/mongodb/lib/apm.js

@@ -0,0 +1,31 @@
+'use strict';
+const EventEmitter = require('events').EventEmitter;
+
+class Instrumentation extends EventEmitter {
+  constructor() {
+    super();
+  }
+
+  instrument(MongoClient, callback) {
+    // store a reference to the original functions
+    this.$MongoClient = MongoClient;
+    const $prototypeConnect = (this.$prototypeConnect = MongoClient.prototype.connect);
+
+    const instrumentation = this;
+    MongoClient.prototype.connect = function(callback) {
+      this.s.options.monitorCommands = true;
+      this.on('commandStarted', event => instrumentation.emit('started', event));
+      this.on('commandSucceeded', event => instrumentation.emit('succeeded', event));
+      this.on('commandFailed', event => instrumentation.emit('failed', event));
+      return $prototypeConnect.call(this, callback);
+    };
+
+    if (typeof callback === 'function') callback(null, this);
+  }
+
+  uninstrument() {
+    this.$MongoClient.prototype.connect = this.$prototypeConnect;
+  }
+}
+
+module.exports = Instrumentation;