fix(NODE-3688): remove wire version check

Author: durran

src/cmap/connect.ts

@@ -186,10 +186,7 @@ function performInitialHandshake(
         }
         provider.auth(authContext, err => {
           if (err) {
-            if (
-              err instanceof MongoError &&
-              needsRetryableWriteLabel(err, response.maxWireVersion)
-            ) {
+            if (err instanceof MongoError && needsRetryableWriteLabel(err)) {
               err.addErrorLabel(MongoErrorLabel.RetryableWriteError);
             }
             return callback(err);

src/error.ts

@@ -743,18 +743,14 @@ const RETRYABLE_WRITE_ERROR_CODES = new Set<number>([
   MONGODB_ERROR_CODES.ExceededTimeLimit
 ]);
 
-export function needsRetryableWriteLabel(error: Error, maxWireVersion: number): boolean {
-  // pre-4.4 server, then the driver adds an error label for every valid case
-  // execute operation will only inspect the label, code/message logic is handled here
+export function needsRetryableWriteLabel(error: Error): boolean {
+  // Network errors are always retryable.
   if (error instanceof MongoNetworkError) {
     return true;
   }
 
-  if (
-    maxWireVersion >= 9 ||
-    (error instanceof MongoError && error.hasErrorLabel(MongoErrorLabel.RetryableWriteError))
-  ) {
-    // If we already have the error label no need to add it again. 4.4+ servers add the label.
+  // We don't need to apply the label if it's already there.
+  if (error instanceof MongoError && error.hasErrorLabel(MongoErrorLabel.RetryableWriteError)) {
     return false;
   }
 

src/sdam/server.ts

@@ -554,7 +554,7 @@ function makeOperationHandler(
     } else {
       if (
         (isRetryableWritesEnabled(server.s.topology) || isTransactionCommand(cmd)) &&
-        needsRetryableWriteLabel(error, maxWireVersion(server)) &&
+        needsRetryableWriteLabel(error) &&
         !inActiveTransaction(session, cmd)
       ) {
         error.addErrorLabel(MongoErrorLabel.RetryableWriteError);

test/spec/retryable-writes/unified/handshakeError.json

@@ -181,10 +181,7 @@
                   "saslContinue",
                   "ping"
                 ],
-                "errorCode": 91,
-                "errorLabels": [
-                  "RetryableWriteError"
-                ]
+                "errorCode": 91
               }
             }
           }

test/spec/retryable-writes/unified/handshakeError.yml

@@ -94,7 +94,6 @@ tests:
             data:
               failCommands: [saslContinue, ping]
               errorCode: 91 # ShutdownInProgress
-              errorLabels: ["RetryableWriteError"]
       - name: runCommand
         object: *database0
         arguments:

test/unit/error.test.ts

@@ -449,8 +449,8 @@ describe('MongoErrors', () => {
           maxWireVersion: BELOW_4_4
         },
         {
-          description: 'a MongoWriteConcernError with a retryable code above server 4.4',
-          result: false,
+          description: 'a MongoWriteConcernError with a retryable code but no label above 4.4',
+          result: true,
           error: new MongoWriteConcernError({}, { code: 262 }),
           maxWireVersion: ABOVE_4_4
         },
@@ -485,9 +485,9 @@ describe('MongoErrors', () => {
           maxWireVersion: ABOVE_4_4
         }
       ];
-      for (const { description, result, error, maxWireVersion } of tests) {
+      for (const { description, result, error } of tests) {
         it(`${description} ${result ? 'needs' : 'does not need'} a retryable write label`, () => {
-          expect(needsRetryableWriteLabel(error, maxWireVersion)).to.be.equal(result);
+          expect(needsRetryableWriteLabel(error)).to.be.equal(result);
         });
       }
     });