fix(instr-mongodb): fix function patch missing one argument introduced in v6.8.0 (#2314)

Co-authored-by: Marc Pichler <marc.pichler@dynatrace.com>

Author: david-luna

package-lock.json

@@ -56,10 +56,9 @@
     "@opentelemetry/sdk-trace-node": "^1.8.0",
     "@types/bson": "4.0.5",
     "@types/mocha": "7.0.2",
-    "@types/mongodb": "3.6.20",
     "@types/node": "18.6.5",
     "mocha": "7.2.0",
-    "mongodb": "6.5.0",
+    "mongodb": "6.8.0",
     "nyc": "15.1.0",
     "rimraf": "5.0.5",
     "test-all-versions": "6.1.0",

plugins/node/opentelemetry-instrumentation-mongodb/package.json

@@ -44,6 +44,7 @@ import {
   ServerSession,
   MongodbCommandType,
   MongoInternalCommand,
+  MongodbNamespace,
   MongoInternalTopology,
   WireProtocolInternal,
   V4Connection,
@@ -529,7 +530,7 @@ export class MongoDBInstrumentation extends InstrumentationBase {
     return (original: V4Connection['commandCallback']) => {
       return function patchedV4ServerCommand(
         this: any,
-        ns: any,
+        ns: MongodbNamespace,
         cmd: any,
         options: undefined | unknown,
         callback: any
@@ -577,16 +578,15 @@ export class MongoDBInstrumentation extends InstrumentationBase {
     return (original: V4Connection['commandPromise']) => {
       return function patchedV4ServerCommand(
         this: any,
-        ns: any,
-        cmd: any,
-        options: undefined | unknown
+        ...args: Parameters<V4Connection['commandPromise']>
       ) {
+        const [ns, cmd] = args;
         const currentSpan = trace.getSpan(context.active());
         const commandType = Object.keys(cmd)[0];
         const resultHandler = () => undefined;
 
         if (typeof cmd !== 'object' || cmd.ismaster || cmd.hello) {
-          return original.call(this, ns, cmd, options);
+          return original.apply(this, args);
         }
 
         let span = undefined;
@@ -610,7 +610,7 @@ export class MongoDBInstrumentation extends InstrumentationBase {
           commandType
         );
 
-        const result = original.call(this, ns, cmd, options);
+        const result = original.apply(this, args);
         result.then(
           (res: any) => patchedCallback(null, res),
           (err: any) => patchedCallback(err)
@@ -792,7 +792,7 @@ export class MongoDBInstrumentation extends InstrumentationBase {
   private _populateV4Attributes(
     span: Span,
     connectionCtx: any,
-    ns: any,
+    ns: MongodbNamespace,
     command?: any,
     operation?: string
   ) {

plugins/node/opentelemetry-instrumentation-mongodb/src/instrumentation.ts

@@ -176,19 +176,28 @@ export type Document = {
   [key: string]: any;
 };
 
+// https://github.com/mongodb/node-mongodb-native/blob/v6.4.0/src/utils.ts#L281
+export interface MongodbNamespace {
+  db: string;
+  collection?: string;
+}
+
 export type V4Connection = {
   command: Function;
   // From version 6.4.0 the method does not expect a callback and returns a promise
   // https://github.com/mongodb/node-mongodb-native/blob/v6.4.2/src/cmap/connection.ts
   commandPromise(
-    ns: any,
+    ns: MongodbNamespace,
     cmd: Document,
-    options: undefined | unknown
+    options: undefined | unknown,
+    // From v6.6.0 we have this new param which is a constructor function
+    // https://github.com/mongodb/node-mongodb-native/blob/v6.6.0/src/cmap/connection.ts#L588
+    responseType: undefined | unknown
   ): Promise<any>;
   // Earlier versions expect a callback param and return void
   // https://github.com/mongodb/node-mongodb-native/blob/v4.2.2/src/cmap/connection.ts
   commandCallback(
-    ns: any,
+    ns: MongodbNamespace,
     cmd: Document,
     options: undefined | unknown,
     callback: any

plugins/node/opentelemetry-instrumentation-mongodb/src/internal-types.ts

@@ -499,12 +499,23 @@ describe('MongoDBInstrumentation-Tracing-v5', () => {
   });
 
   describe('when specifying a responseHook configuration', () => {
-    const dataAttributeName = 'mongodb_data';
     describe('with a valid function', () => {
       beforeEach(() => {
         create({
-          responseHook: (span: Span, result: MongoResponseHookInformation) => {
-            span.setAttribute(dataAttributeName, JSON.stringify(result.data));
+          responseHook: (span: Span, result: any) => {
+            const { data } = result;
+            if (data.n) {
+              span.setAttribute('mongodb_insert_count', result.data.n);
+            }
+            // from v6.8.0 the cursor property is not an object but an instance of
+            // `CursorResponse`. We need to use the `toObject` method to be able to inspect the data
+            const cursorObj = data.cursor.firstBatch
+              ? data.cursor
+              : data.cursor.toObject();
+            span.setAttribute(
+              'mongodb_first_result',
+              JSON.stringify(cursorObj.firstBatch[0])
+            );
           },
         });
       });
@@ -520,8 +531,7 @@ describe('MongoDBInstrumentation-Tracing-v5', () => {
               const spans = getTestSpans();
               const insertSpan = spans[0];
               assert.deepStrictEqual(
-                JSON.parse(insertSpan.attributes[dataAttributeName] as string)
-                  .n,
+                insertSpan.attributes['mongodb_insert_count'],
                 results?.insertedCount
               );
 
@@ -544,12 +554,12 @@ describe('MongoDBInstrumentation-Tracing-v5', () => {
               const spans = getTestSpans();
               const findSpan = spans[0];
               const hookAttributeValue = JSON.parse(
-                findSpan.attributes[dataAttributeName] as string
+                findSpan.attributes['mongodb_first_result'] as string
               );
 
               if (results) {
                 assert.strictEqual(
-                  hookAttributeValue?.cursor?.firstBatch[0]._id,
+                  hookAttributeValue?._id,
                   results[0]._id.toString()
                 );
               } else {