Merge pull request #7245 from muxi/fix-7181

Fix of Issue #7181 documentation and Objective C code

doc/statuscodes.md

@@ -18,6 +18,7 @@ Only a subset of the pre-defined status codes are generated by the gRPC librarie
 | Could not decompress, but compression algorithm supported (Server -> Client)	| INTERNAL | Client |
 | Compression mechanism used by client not supported at server	| UNIMPLEMENTED | Server |
 | Server temporarily out of resources (e.g., Flow-control resource limits reached) |	RESOURCE_EXHAUSTED | Server|
+| Client does not have enough memory to hold the server response | RESOURCE_EXHAUSTED | Client |
 | Flow-control protocol violation |	INTERNAL | Both |
 | Error parsing returned status	| UNKNOWN | Client |
 | Incorrect Auth metadata ( Credentials failed to get metadata, Incompatible credentials set on channel and call, Invalid host set in `:authority` metadata, etc.) | UNAUTHENTICATED | Both |

src/objective-c/GRPCClient/GRPCCall.m

@@ -208,13 +208,9 @@ NSString * const kGRPCTrailersKey = @"io.grpc.TrailersKey";
         // don't want to throw, because the app shouldn't crash for a behavior
         // that's on the hands of any server to have. Instead we finish and ask
         // the server to cancel.
-        //
-        // TODO(jcanizales): No canonical code is appropriate for this situation
-        // (because it's just a client problem). Use another domain and an
-        // appropriately-documented code.
         [weakSelf finishWithError:[NSError errorWithDomain:kGRPCErrorDomain
-                                                      code:GRPCErrorCodeInternal
-                                                  userInfo:nil]];
+                                                      code:GRPCErrorCodeResourceExhausted
+                                                  userInfo:@{NSLocalizedDescriptionKey: @"Client does not have enough memory to hold the server response."}]];
         [weakSelf cancelCall];
         return;
       }