Request matcher not working on grpc

Describe the bug Trying to match with is + capture doesn’t work

To Reproduce Steps to reproduce the behavior:

1. Tree structure:

./mocks
    |- /test
        |- Greeter
             |- SayHello.mock
./protos
    |- simple.proto
./config.yml

1. File content:

// simple.proto
syntax = "proto3";

package test;

service Greeter {
  rpc SayHello (HelloRequest) returns (HelloReply);
}

message HelloRequest {
  string name = 1;
}

message HelloReply {
  string message = 1;
}

// SayHello.mock
{{#is (capture using='jsonpath' selector='$.name') 'Bob' }}
{
  "message": "{{capture using='jsonpath' selector='$.name'}}"
}
{{else}}
{
  "message": "Not Bob, you are: {{capture using='jsonpath' selector='$.name'}}"
}
{{/is}}

// config.yml
...
  grpc:
    enable: true
    #host: localhost
    host: 0.0.0.0
    port: 4312
    mocks_dir: "./mocks"
    protos_dir: "./protos"
    grpc_tls: false

1. Run camouflage: docker run -d -p 4312:4312 -v $(pwd):/app --name camouflage shubhendumadhukar/camouflage
2. Hit endpoint with Bob:

grpcurl \
  -proto protos/simple.proto \
  -d '{"name": "Bob"}' \
  -plaintext \
  localhost:4312 \
  test.Greeter/SayHello
{
  "message": "Not Bob, you are: Bob"
}

1. Hit endpoint with Alice:

grpcurl \
  -proto protos/simple.proto \
  -d '{"name": "Alice"}' \
  -plaintext \
  localhost:4312 \
  test.Greeter/SayHello
{
  "message": "Not Bob, you are: Alice"
}

Expected behavior Step 4 should print a different message: { "message": "Bob" }.

The jsonpath is correct, because when returning the message, it correctly says “you are: Bob”. However, the comparison doesn’t seem to be working.

Additional context

2022-09-30 15:07:53 debug: Unary Request: {"name":"Bob"}
2022-09-30 15:07:53 debug: Mock file path: mocks/test/Greeter/SayHello.mock
2022-09-30 15:07:53 debug: Response: {
  "message": "Not Bob, you are: Bob"
}

[shubhendumadhukar]

Apologies for the delay in response. I have been occupied elsewhere and had only been looking at pull requests.

I have however looked into the issue. TLDR; Use regex instead of jsonpath as an interim solution.

Explanation:

1. Capture helper: It seems like if we use jsonpath to capture a value, the type of value is object.
2. Is helper: The comparison takes into account the types of the values being compared.
3. Why the results are unexpected? a. The left hand side value i.e. (capture using='jsonpath' selector='$.name') has a type of object b. The right hand side value i.e. ‘Bob’ has a type of string c. Since comparison consider types, the condition returns false.
4. Using regex both left hand and right hand side values are strings hence the comparison returns true. (capture using='regex' selector='\"name\": \"(.*?)\"')

Next Steps:

1. Add notes in documentation.
2. Provide fix for the jsonpath path issue.

[shubhendumadhukar]

Added new operator ==, this should disable strict type checking. Modifying mock as shown below would produce appropriate result.

Before {{#is (capture using='jsonpath' selector='$.name') 'Bob' }}

After {{#is (capture using='jsonpath' selector='$.name') '==' 'Bob' }}

Updated mock content

{{#is (capture using='jsonpath' selector='$.name') '==' 'Bob' }}
{
  "message": "{{capture using='jsonpath' selector='$.name'}}"
}
{{else}}
{
  "message": "Not Bob, you are: {{capture using='jsonpath' selector='$.name'}}"
}
{{/is}}

Change would be available in next release