Provider test fails for gRPC when proto file has java_package instead of package

[svillegasz]

The gRPC provider test does not work correctly when the proto file used to generate the pact includes an option java_package but lacks a package definition. The proto file is valid, and both the gRPC server and consumer test work as expected. However, the provider test fails with a "Method not found" error. It appears that the gRPC requests add a . (dot) before the service name specified in the proto file and in the pact, likely due to the missing package name.

Steps to Reproduce:

1. In the pact-plugins repository, update the proto/area_calculator.proto file (link to proto file), replacing package area_calculator; with option java_package = "area_calculator";.

syntax = "proto3";

option java_package = "area_calculator";

option go_package = "io.pact/area_calculator";

service Calculator {
  rpc calculateOne (ShapeMessage) returns (AreaResponse) {}
  rpc calculateMulti (AreaRequest) returns (AreaResponse) {}
}

message ShapeMessage {
  oneof shape {
    Square square = 1;
    Rectangle rectangle = 2;
    Circle circle = 3;
    Triangle triangle = 4;
    Parallelogram parallelogram = 5;
  }
}

message Square {
  float edge_length = 1;
}

message Rectangle {
  float length = 1;
  float width = 2;
}

message Circle {
  float radius = 1;
}

message Triangle {
  float edge_a = 1;
  float edge_b = 2;
  float edge_c = 3;
}

message Parallelogram {
  float base_length = 1;
  float height = 2;
}

message AreaRequest {
  repeated ShapeMessage shapes = 1;
}

message AreaResponse {
  repeated float value = 1;
}

3. Run the consumer test (link to consumer test) to generate the pact.

{
  "consumer": {
    "name": "grpc-consumer-jvm"
  },
  "interactions": [
    {
      "comments": {
        "testname": "io.pact.example.grpc.maven.PactConsumerTest.calculateRectangleArea(MockServer, SynchronousMessages)"
      },
      "description": "calculate rectangle area request",
      "interactionMarkup": {
        "markup": "```protobuf\nmessage ShapeMessage {\n    message .Rectangle rectangle = 2;\n}\n```\n\n```protobuf\nmessage AreaResponse {\n    repeated float value = 1;\n}\n```\n",
        "markupType": "COMMON_MARK"
      },
      "key": "c7fbe3ee",
      "pending": false,
      "pluginConfiguration": {
        "protobuf": {
          "descriptorKey": "4dd232df817d20316d8f28a658e82add",
          "service": "Calculator/calculateOne"
        }
      },
      "request": {
        "contents": {
          "content": "EgoNAABAQBUAAIBA",
          "contentType": "application/protobuf; message=ShapeMessage",
          "contentTypeHint": "BINARY",
          "encoded": "base64"
        },
        "matchingRules": {
          "body": {
            "$.rectangle.length": {
              "combine": "AND",
              "matchers": [
                {
                  "match": "number"
                }
              ]
            },
            "$.rectangle.width": {
              "combine": "AND",
              "matchers": [
                {
                  "match": "number"
                }
              ]
            }
          }
        },
        "metadata": {
          "contentType": "application/protobuf;message=ShapeMessage"
        }
      },
      "response": [
        {
          "contents": {
            "content": "CgQAAEBB",
            "contentType": "application/protobuf; message=AreaResponse",
            "contentTypeHint": "BINARY",
            "encoded": "base64"
          },
          "matchingRules": {
            "body": {
              "$.value.*": {
                "combine": "AND",
                "matchers": [
                  {
                    "match": "number"
                  }
                ]
              }
            }
          },
          "metadata": {
            "contentType": "application/protobuf;message=AreaResponse"
          }
        }
      ],
      "transport": "grpc",
      "type": "Synchronous/Messages"
    }
  ],
  "metadata": {
    "pact-jvm": {
      "version": "4.6.11"
    },
    "pactSpecification": {
      "version": "4.0"
    },
    "plugins": [
      {
        "configuration": {
          "4dd232df817d20316d8f28a658e82add": {
            "protoDescriptors": "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",
            "protoFile": "syntax = \"proto3\";\n\noption java_package = \"area_calculator\";\n\noption go_package = \"io.pact/area_calculator\";\n\nservice Calculator {\n  rpc calculateOne (ShapeMessage) returns (AreaResponse) {}\n  rpc calculateMulti (AreaRequest) returns (AreaResponse) {}\n}\n\nmessage ShapeMessage {\n  oneof shape {\n    Square square = 1;\n    Rectangle rectangle = 2;\n    Circle circle = 3;\n    Triangle triangle = 4;\n    Parallelogram parallelogram = 5;\n  }\n}\n\nmessage Square {\n  float edge_length = 1;\n}\n\nmessage Rectangle {\n  float length = 1;\n  float width = 2;\n}\n\nmessage Circle {\n  float radius = 1;\n}\n\nmessage Triangle {\n  float edge_a = 1;\n  float edge_b = 2;\n  float edge_c = 3;\n}\n\nmessage Parallelogram {\n  float base_length = 1;\n  float height = 2;\n}\n\nmessage AreaRequest {\n  repeated ShapeMessage shapes = 1;\n}\n\nmessage AreaResponse {\n  repeated float value = 1;\n}\n"
          }
        },
        "name": "protobuf",
        "version": "0.4.0"
      }
    ]
  },
  "provider": {
    "name": "area-calculator-provider"
  }
}

4. Using the generated pact, run the provider test (link to provider test).

Expected Behavior: The provider test should pass without requiring a package definition in the proto file, as the gRPC server and consumer test work as expected.

Actual Behavior: The provider test fails with the following error:
1) Verification Failed - gRPC error: status Operation is not implemented or not supported, message 'Method not found: .Calculator/calculateOne'