CODEWITHSUNDEEP
protocol-buffersgrpcprotobuf.jsgrpc-nodegrpc-web
Leonardo Teixeira
Leonardo Teixeira

Reputation: 54

How to define a gRPC service that handles any call?

I'm trying do some reverse engineering trying to understand what services are called among several .proto files. My question is if it's possible to implement a service on the server that handles all the call made and gives me the information of which function and service was called.

Example:

protocol.proto

syntax = "proto3";

package greating;

message PersonRequest {
    string name = 1;
    int32 age = 2;
}

message PersonResponse {
    string message = 1;
}

service GreatingService {
    rpc helloPerson (PersonRequest) returns (PersonResponse);
} 

service WarningService {
    rpc attentionPerson (PersonRequest) returns (PersonResponse);
}


server.js

const packageDefinition = protoLoader.loadSync("greating.proto");
const greatingProto = grpc.loadPackageDefinition(packageDefinition);

var server = new grpc.Server();

server.addService(greatingProto.greating.GreatingService.service, {
    helloPerson: function(call, callback) {
        let response = `Hello ${call.request.name}! You're ${call.request.age} years old`;

        return callback(null, { message: response });
    }
});

server.addService(greatingProto.greating.WarningService.service, {
    helloPerson: function(call, callback) {

        let response = `Attention ${call.request.name}! You're  ${call.request.age} years left to live`;

        return callback(null, { message: response });
    }
});


What I want to do is to implement a 3rd function that handles both (all) calls, and displays which service was called. Something like this:

server.addService("*", {
    function(call, callback) {
        let response = `The service ${call.service}, function ${call.function} was called.`;

        return callback(null, { message: response });
    }
});

Is there a way to do this?

Thank you.

Upvotes: 1

Views: 498

Answers (1)

murgatroid99
murgatroid99

Reputation: 20267

No, grpc does not support wildcard method handlers, or any other way of handling every incoming request with a single handler.

Upvotes: 1

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