create addition service using go

addition-service/generated/generated/calculator_grpc.pb.go

+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.5.1
+// - protoc             v6.33.0
+// source: calculator.proto
+
+package generated
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.64.0 or later.
+const _ = grpc.SupportPackageIsVersion9
+
+const (
+	Calculator_Add_FullMethodName                 = "/calculator.Calculator/Add"
+	Calculator_Multiply_FullMethodName            = "/calculator.Calculator/Multiply"
+	Calculator_GetOperationHistory_FullMethodName = "/calculator.Calculator/GetOperationHistory"
+)
+
+// CalculatorClient is the client API for Calculator service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type CalculatorClient interface {
+	Add(ctx context.Context, in *Numbers, opts ...grpc.CallOption) (*Result, error)
+	Multiply(ctx context.Context, in *Numbers, opts ...grpc.CallOption) (*Result, error)
+	GetOperationHistory(ctx context.Context, in *Empty, opts ...grpc.CallOption) (grpc.ServerStreamingClient[OperationHistory], error)
+}
+
+type calculatorClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewCalculatorClient(cc grpc.ClientConnInterface) CalculatorClient {
+	return &calculatorClient{cc}
+}
+
+func (c *calculatorClient) Add(ctx context.Context, in *Numbers, opts ...grpc.CallOption) (*Result, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(Result)
+	err := c.cc.Invoke(ctx, Calculator_Add_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *calculatorClient) Multiply(ctx context.Context, in *Numbers, opts ...grpc.CallOption) (*Result, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(Result)
+	err := c.cc.Invoke(ctx, Calculator_Multiply_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *calculatorClient) GetOperationHistory(ctx context.Context, in *Empty, opts ...grpc.CallOption) (grpc.ServerStreamingClient[OperationHistory], error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	stream, err := c.cc.NewStream(ctx, &Calculator_ServiceDesc.Streams[0], Calculator_GetOperationHistory_FullMethodName, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &grpc.GenericClientStream[Empty, OperationHistory]{ClientStream: stream}
+	if err := x.ClientStream.SendMsg(in); err != nil {
+		return nil, err
+	}
+	if err := x.ClientStream.CloseSend(); err != nil {
+		return nil, err
+	}
+	return x, nil
+}
+
+// This type alias is provided for backwards compatibility with existing code that references the prior non-generic stream type by name.
+type Calculator_GetOperationHistoryClient = grpc.ServerStreamingClient[OperationHistory]
+
+// CalculatorServer is the server API for Calculator service.
+// All implementations must embed UnimplementedCalculatorServer
+// for forward compatibility.
+type CalculatorServer interface {
+	Add(context.Context, *Numbers) (*Result, error)
+	Multiply(context.Context, *Numbers) (*Result, error)
+	GetOperationHistory(*Empty, grpc.ServerStreamingServer[OperationHistory]) error
+	mustEmbedUnimplementedCalculatorServer()
+}
+
+// UnimplementedCalculatorServer must be embedded to have
+// forward compatible implementations.
+//
+// NOTE: this should be embedded by value instead of pointer to avoid a nil
+// pointer dereference when methods are called.
+type UnimplementedCalculatorServer struct{}
+
+func (UnimplementedCalculatorServer) Add(context.Context, *Numbers) (*Result, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Add not implemented")
+}
+func (UnimplementedCalculatorServer) Multiply(context.Context, *Numbers) (*Result, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Multiply not implemented")
+}
+func (UnimplementedCalculatorServer) GetOperationHistory(*Empty, grpc.ServerStreamingServer[OperationHistory]) error {
+	return status.Errorf(codes.Unimplemented, "method GetOperationHistory not implemented")
+}
+func (UnimplementedCalculatorServer) mustEmbedUnimplementedCalculatorServer() {}
+func (UnimplementedCalculatorServer) testEmbeddedByValue()                    {}
+
+// UnsafeCalculatorServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to CalculatorServer will
+// result in compilation errors.
+type UnsafeCalculatorServer interface {
+	mustEmbedUnimplementedCalculatorServer()
+}
+
+func RegisterCalculatorServer(s grpc.ServiceRegistrar, srv CalculatorServer) {
+	// If the following call pancis, it indicates UnimplementedCalculatorServer was
+	// embedded by pointer and is nil.  This will cause panics if an
+	// unimplemented method is ever invoked, so we test this at initialization
+	// time to prevent it from happening at runtime later due to I/O.
+	if t, ok := srv.(interface{ testEmbeddedByValue() }); ok {
+		t.testEmbeddedByValue()
+	}
+	s.RegisterService(&Calculator_ServiceDesc, srv)
+}
+
+func _Calculator_Add_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(Numbers)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CalculatorServer).Add(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: Calculator_Add_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CalculatorServer).Add(ctx, req.(*Numbers))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Calculator_Multiply_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(Numbers)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(CalculatorServer).Multiply(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: Calculator_Multiply_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(CalculatorServer).Multiply(ctx, req.(*Numbers))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _Calculator_GetOperationHistory_Handler(srv interface{}, stream grpc.ServerStream) error {
+	m := new(Empty)
+	if err := stream.RecvMsg(m); err != nil {
+		return err
+	}
+	return srv.(CalculatorServer).GetOperationHistory(m, &grpc.GenericServerStream[Empty, OperationHistory]{ServerStream: stream})
+}
+
+// This type alias is provided for backwards compatibility with existing code that references the prior non-generic stream type by name.
+type Calculator_GetOperationHistoryServer = grpc.ServerStreamingServer[OperationHistory]
+
+// Calculator_ServiceDesc is the grpc.ServiceDesc for Calculator service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var Calculator_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "calculator.Calculator",
+	HandlerType: (*CalculatorServer)(nil),
+	Methods: []grpc.MethodDesc{
+		{
+			MethodName: "Add",
+			Handler:    _Calculator_Add_Handler,
+		},
+		{
+			MethodName: "Multiply",
+			Handler:    _Calculator_Multiply_Handler,
+		},
+	},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "GetOperationHistory",
+			Handler:       _Calculator_GetOperationHistory_Handler,
+			ServerStreams: true,
+		},
+	},
+	Metadata: "calculator.proto",
+}

addition-service/go.mod

+module addition-service
+
+go 1.21
+
+require (
+    google.golang.org/grpc v1.59.0
+    google.golang.org/protobuf v1.31.0
+)
\ No newline at end of file

addition-service/main.go

+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net"
+	"os"
+	"sync"
+	"time"
+
+	"addition-service/generated"
+
+	"google.golang.org/grpc"
+)
+
+type additionServer struct {
+	generated.UnimplementedCalculatorServer
+	operations []*generated.Operation
+	mutex      sync.RWMutex
+}
+
+func (s *additionServer) Add(ctx context.Context, req *generated.Numbers) (*generated.Result, error) {
+	result := req.A + req.B
+	
+	op := &generated.Operation{
+		Type:      "ADDITION",
+		A:         req.A,
+		B:         req.B,
+		Result:    result,
+		Timestamp: time.Now().Format("2006-01-02 15:04:05"),
+	}
+	
+	s.mutex.Lock()
+	s.operations = append(s.operations, op)
+	s.mutex.Unlock()
+	
+	go s.logToFile(op)
+	
+	fmt.Printf(" Addition operation: %d + %d = %d\n", req.A, req.B, result)
+	
+	return &generated.Result{
+		Value:     result,
+		Operation: "ADDITION",
+	}, nil
+}
+
+func (s *additionServer) GetOperationHistory(req *generated.Empty, stream generated.Calculator_GetOperationHistoryServer) error {
+	s.mutex.RLock()
+	defer s.mutex.RUnlock()
+	
+	history := &generated.OperationHistory{
+		ServiceName: "Addition Service",
+		Operations:  s.operations,
+	}
+	
+	if err := stream.Send(history); err != nil {
+		return err
+	}
+	
+	return nil
+}
+
+func (s *additionServer) logToFile(op *generated.Operation) {
+	file, err := os.OpenFile("operation_log.txt", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		log.Printf("Failed to open log file: %v", err)
+		return
+	}
+	defer file.Close()
+	
+	logEntry := fmt.Sprintf("[%s] %s: %d + %d = %d\n", 
+		op.Timestamp, op.Type, op.A, op.B, op.Result)
+	
+	if _, err := file.WriteString(logEntry); err != nil {
+		log.Printf("Failed to write to log file: %v", err)
+	}
+}
+
+func main() {
+	lis, err := net.Listen("tcp", ":50052")
+	if err != nil {
+		log.Fatalf("Failed to listen: %v", err)
+	}
+	
+	server := grpc.NewServer()
+	additionServer := &additionServer{
+		operations: make([]*generated.Operation, 0),
+	}
+	
+	generated.RegisterCalculatorServer(server, additionServer)
+	
+	fmt.Println(" Addition Service running on port 50052")
+	fmt.Println(" Ready to receive addition requests...")
+	
+	if err := server.Serve(lis); err != nil {
+		log.Fatalf("Failed to serve: %v", err)
+	}
+}
\ No newline at end of file

proto/calculator.proto

@@ -2,6 +2,8 @@ syntax = "proto3";
 
 package calculator;
 
+option go_package = "./generated";
+
 option java_package = "com.calculator.multiplication.generated";
 option java_multiple_files = true;