Advanced Techniques in Go Programming/

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Solution 4: Working with gRPC

Solution 4: Working with gRPC

Let’s solve the challenge set in the previous lesson.

We'll cover the following...

Solution

To execute the client side, open a new terminal window and run the following commands:

export GOROOT=/usr/local/go; export GOPATH=$HOME/go; export PATH=$GOPATH/bin:$GOROOT/bin:$PATH; cd usercode;
go run gClient.go

Here is the gRPC service that implements integer addition and subtraction:

syntax = "proto3";

option go_package = "./;protoapi";

service Math {
    rpc Add (MathRequest) returns (MathResult);
    rpc Subtract (MathRequest) returns (MathResult);
}

message MathRequest {
    int64 Operand1 = 1;
    int64 Operand2 = 2;
}

message MathResult {
    int64 Result = 1;
}
gServer.go and gClient,go

Code explanation

Let's look at the code explanation of each file. Following is the code explanation of the protoapi/protoapi.proto file:

  • Line 5: This defines the gRPC service named Math.

  • Line 6: This defines an RPC method named Add that takes a MathRequest message as input and returns a MathResult message as output. This method will perform addition.

  • Line 7: This defines another RPC ...