Построение микросервисной архитектуры на Golang и gRPC, часть 1

//consigment.proto
syntax = "proto3";

package go.micro.srv.consignment; 

service ShippingService {
  rpc CreateConsignment(Consignment) returns (Response) {}
}

message Consignment {
  string id = 1;
  string description = 2;
  int32 weight = 3;
  repeated Container containers = 4;
  string vessel_id = 5;
}

message Container {
  string id = 1;
  string customer_id = 2;
  string origin = 3;
  string user_id = 4;
}

message Response {
  bool created = 1;
  Consignment consignment = 2;
}

// Code generated by protoc-gen-go. DO NOT EDIT.
// source: consignment.proto

package consignment

import (
    fmt "fmt"
    proto "github.com/golang/protobuf/proto"
    context "golang.org/x/net/context"
    grpc "google.golang.org/grpc"
    math "math"
)

// Reference imports to suppress errors if they are not otherwise used.
var _ = proto.Marshal
var _ = fmt.Errorf
var _ = math.Inf

// This is a compile-time assertion to ensure that this generated file
// is compatible with the proto package it is being compiled against.
// A compilation error at this line likely means your copy of the
// proto package needs to be updated.
const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package

type Consignment struct {
    Id                   int32        `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
    Description          string       `protobuf:"bytes,2,opt,name=description,proto3" json:"description,omitempty"`
    Weight               int32        `protobuf:"varint,3,opt,name=weight,proto3" json:"weight,omitempty"`
    Containers           []*Container `protobuf:"bytes,4,rep,name=containers,proto3" json:"containers,omitempty"`
    VesselId             string       `protobuf:"bytes,5,opt,name=vessel_id,json=vesselId,proto3" json:"vessel_id,omitempty"`
    XXX_NoUnkeyedLiteral struct{}     `json:"-"`
    XXX_unrecognized     []byte       `json:"-"`
    XXX_sizecache        int32        `json:"-"`
}

func (m *Consignment) Reset()         { *m = Consignment{} }
func (m *Consignment) String() string { return proto.CompactTextString(m) }
func (*Consignment) ProtoMessage()    {}
func (*Consignment) Descriptor() ([]byte, []int) {
    return fileDescriptor_3804bf87090b51a9, []int{0}
}

func (m *Consignment) XXX_Unmarshal(b []byte) error {
    return xxx_messageInfo_Consignment.Unmarshal(m, b)
}
func (m *Consignment) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
    return xxx_messageInfo_Consignment.Marshal(b, m, deterministic)
}
func (m *Consignment) XXX_Merge(src proto.Message) {
    xxx_messageInfo_Consignment.Merge(m, src)
}
func (m *Consignment) XXX_Size() int {
    return xxx_messageInfo_Consignment.Size(m)
}
func (m *Consignment) XXX_DiscardUnknown() {
    xxx_messageInfo_Consignment.DiscardUnknown(m)
}

var xxx_messageInfo_Consignment proto.InternalMessageInfo

func (m *Consignment) GetId() int32 {
    if m != nil {
        return m.Id
    }
    return 0
}

func (m *Consignment) GetDescription() string {
    if m != nil {
        return m.Description
    }
    return ""
}

func (m *Consignment) GetWeight() int32 {
    if m != nil {
        return m.Weight
    }
    return 0
}

func (m *Consignment) GetContainers() []*Container {
    if m != nil {
        return m.Containers
    }
    return nil
}

func (m *Consignment) GetVesselId() string {
    if m != nil {
        return m.VesselId
    }
    return ""
}

type Container struct {
    Id                   int32    `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
    CustomerId           string   `protobuf:"bytes,2,opt,name=customer_id,json=customerId,proto3" json:"customer_id,omitempty"`
    Origin               string   `protobuf:"bytes,3,opt,name=origin,proto3" json:"origin,omitempty"`
    UserId               string   `protobuf:"bytes,4,opt,name=user_id,json=userId,proto3" json:"user_id,omitempty"`
    XXX_NoUnkeyedLiteral struct{} `json:"-"`
    XXX_unrecognized     []byte   `json:"-"`
    XXX_sizecache        int32    `json:"-"`
}

func (m *Container) Reset()         { *m = Container{} }
func (m *Container) String() string { return proto.CompactTextString(m) }
func (*Container) ProtoMessage()    {}
func (*Container) Descriptor() ([]byte, []int) {
    return fileDescriptor_3804bf87090b51a9, []int{1}
}

func (m *Container) XXX_Unmarshal(b []byte) error {
    return xxx_messageInfo_Container.Unmarshal(m, b)
}
func (m *Container) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
    return xxx_messageInfo_Container.Marshal(b, m, deterministic)
}
func (m *Container) XXX_Merge(src proto.Message) {
    xxx_messageInfo_Container.Merge(m, src)
}
func (m *Container) XXX_Size() int {
    return xxx_messageInfo_Container.Size(m)
}
func (m *Container) XXX_DiscardUnknown() {
    xxx_messageInfo_Container.DiscardUnknown(m)
}

var xxx_messageInfo_Container proto.InternalMessageInfo

func (m *Container) GetId() int32 {
    if m != nil {
        return m.Id
    }
    return 0
}

func (m *Container) GetCustomerId() string {
    if m != nil {
        return m.CustomerId
    }
    return ""
}

func (m *Container) GetOrigin() string {
    if m != nil {
        return m.Origin
    }
    return ""
}

func (m *Container) GetUserId() string {
    if m != nil {
        return m.UserId
    }
    return ""
}

type Response struct {
    Created              bool         `protobuf:"varint,1,opt,name=created,proto3" json:"created,omitempty"`
    Consignment          *Consignment `protobuf:"bytes,2,opt,name=consignment,proto3" json:"consignment,omitempty"`
    XXX_NoUnkeyedLiteral struct{}     `json:"-"`
    XXX_unrecognized     []byte       `json:"-"`
    XXX_sizecache        int32        `json:"-"`
}

func (m *Response) Reset()         { *m = Response{} }
func (m *Response) String() string { return proto.CompactTextString(m) }
func (*Response) ProtoMessage()    {}
func (*Response) Descriptor() ([]byte, []int) {
    return fileDescriptor_3804bf87090b51a9, []int{2}
}

func (m *Response) XXX_Unmarshal(b []byte) error {
    return xxx_messageInfo_Response.Unmarshal(m, b)
}
func (m *Response) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
    return xxx_messageInfo_Response.Marshal(b, m, deterministic)
}
func (m *Response) XXX_Merge(src proto.Message) {
    xxx_messageInfo_Response.Merge(m, src)
}
func (m *Response) XXX_Size() int {
    return xxx_messageInfo_Response.Size(m)
}
func (m *Response) XXX_DiscardUnknown() {
    xxx_messageInfo_Response.DiscardUnknown(m)
}

var xxx_messageInfo_Response proto.InternalMessageInfo

func (m *Response) GetCreated() bool {
    if m != nil {
        return m.Created
    }
    return false
}

func (m *Response) GetConsignment() *Consignment {
    if m != nil {
        return m.Consignment
    }
    return nil
}

func init() {
    proto.RegisterType((*Consignment)(nil), "Consignment")
    proto.RegisterType((*Container)(nil), "Container")
    proto.RegisterType((*Response)(nil), "Response")
}

func init() { proto.RegisterFile("consignment.proto", fileDescriptor_3804bf87090b51a9) }

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// Reference imports to suppress errors if they are not otherwise used.
var _ context.Context
var _ grpc.ClientConn

// This is a compile-time assertion to ensure that this generated file
// is compatible with the grpc package it is being compiled against.
const _ = grpc.SupportPackageIsVersion4

// ShippingServiceClient is the client API for ShippingService service.
//
// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
type ShippingServiceClient interface {
    CreateConsignment(ctx context.Context, in *Consignment, opts ...grpc.CallOption) (*Response, error)
}

type shippingServiceClient struct {
    cc *grpc.ClientConn
}

func NewShippingServiceClient(cc *grpc.ClientConn) ShippingServiceClient {
    return &shippingServiceClient{cc}
}

func (c *shippingServiceClient) CreateConsignment(ctx context.Context, in *Consignment, opts ...grpc.CallOption) (*Response, error) {
    out := new(Response)
    err := c.cc.Invoke(ctx, "/ShippingService/CreateConsignment", in, out, opts...)
    if err != nil {
        return nil, err
    }
    return out, nil
}

// ShippingServiceServer is the server API for ShippingService service.
type ShippingServiceServer interface {
    CreateConsignment(context.Context, *Consignment) (*Response, error)
}

func RegisterShippingServiceServer(s *grpc.Server, srv ShippingServiceServer) {
    s.RegisterService(&_ShippingService_serviceDesc, srv)
}

func _ShippingService_CreateConsignment_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
    in := new(Consignment)
    if err := dec(in); err != nil {
        return nil, err
    }
    if interceptor == nil {
        return srv.(ShippingServiceServer).CreateConsignment(ctx, in)
    }
    info := &grpc.UnaryServerInfo{
        Server:     srv,
        FullMethod: "/ShippingService/CreateConsignment",
    }
    handler := func(ctx context.Context, req interface{}) (interface{}, error) {
        return srv.(ShippingServiceServer).CreateConsignment(ctx, req.(*Consignment))
    }
    return interceptor(ctx, in, info, handler)
}

var _ShippingService_serviceDesc = grpc.ServiceDesc{
    ServiceName: "ShippingService",
    HandlerType: (*ShippingServiceServer)(nil),
    Methods: []grpc.MethodDesc{
        {
            MethodName: "CreateConsignment",
            Handler:    _ShippingService_CreateConsignment_Handler,
        },
    },
    Streams:  []grpc.StreamDesc{},
    Metadata: "consignment.proto",
}

Если, что то пошло не так. Обратите внимание на аргументы -I путь где компилятор ищет фалйлы, --go_out где будет создан новый файл. Всегда есть справка

$ protoc -h 

package seaport

import (
    "log"
    "net"

    // Импотртируем код протобуфера
    pbf "seaport/consignment"

    "golang.org/x/net/context"
    "google.golang.org/grpc"
    "google.golang.org/grpc/reflection" 
)

const (
    port = ":50051"
)

//IRepository - интерфейс хранилища
type IRepository interface {
    Create(*pbf.Consignment) (*pbf.Consignment, error)
}

// Repository - структура для эмитации хранилища,
// после мы заменим её на настоящие хранилищем
type Repository struct {
    consignments []*pbf.Consignment
}

//Create - создаём новое хранилище
func (repo *Repository) Create(consignment *pbf.Consignment) (*pbf.Consignment, error) {
    updated := append(repo.consignments, consignment)
    repo.consignments = updated
    return consignment, nil
}

// Служба должна реализовать все методы для удовлетворения сервиса
// которые мы определили в нашем определении протобуфа. Вы можете проверить интерфейсы
// в сгенерированном коде для точных сигнатур методов и т. д.
type service struct {
    repo IRepository
}

// CreateConsignment - мы создали только один метод для нашего сервиса,
// который является методом create, который принимает контекст и запрос
// потом они обрабатываются сервером gRPC.
func (s *service) CreateConsignment(ctx context.Context, req *pbf.Consignment) (*pbf.Response, error) {

    // Сохраним нашу партию в хранидище
    consignment, err := s.repo.Create(req)
    if err != nil {
        return nil, err
    }

    // Возвращаем сообщение `Response`,
    // которое мы создали в нашем определнии пробуфа
    return &pbf.Response{Created: true, Consignment: consignment}, nil
}

func main() {

    repo := &Repository{}

    // Стартуем наш gRPC сервер для прослушивания tcp
    lis, err := net.Listen("tcp", port)
    if err != nil {
        log.Fatalf("failed to listen: %v", err)
    }
    s := grpc.NewServer()

    // Зарегистрируйте нашу службу на сервере gRPC, это свяжет нашу
    // реализацию с кодом автогенерированного интерфейса для нашего
    // сообщения `Response`, которое мы создали в нашем протобуфе
    pbf.RegisterShippingServiceServer(s, &service{repo})

    // Регистрация службы ответов на сервере gRPC.
    reflection.Register(s)
    if err := s.Serve(lis); err != nil {
        log.Fatalf("failed to serve: %v", err)
    }
}

package main

import (
    "encoding/json"
    "io/ioutil"
    "log"
    "os"

    pbf "seaport/consignment"

    "golang.org/x/net/context"
    "google.golang.org/grpc"
)

const (
    address         = "localhost:50051"
    defaultFilename = "consignment.json"
)

//Функция парсит переданный фаил
func parseFile(file string) (*pbf.Consignment, error) {
    var consignment *pbf.Consignment
    data, err := ioutil.ReadFile(file)
    if err != nil {
        return nil, err
    }
    json.Unmarshal(data, &consignment)
    return consignment, err
}

func main() {
    // Установим соединение с сервером
    conn, err := grpc.Dial(address, grpc.WithInsecure())
    if err != nil {
        log.Fatalf("Не могу подключиться: %v", err)
    }
    defer conn.Close()
    client := pbf.NewShippingServiceClient(conn)

    // Передадим в обработку consignment.json,
    // иначе возьмём путь к файлу из аргументов командной строки
    file := defaultFilename
    if len(os.Args) > 1 {
        file = os.Args[1]
    }

    consignment, err := parseFile(file)

    if err != nil {
        log.Fatalf("Не возможно распарсить фаил: %v", err)
    }

    r, err := client.CreateConsignment(context.Background(), consignment)
    if err != nil {
        log.Fatalf("Не удалось создать: %v", err)
    }
    log.Printf("Создан: %t", r.Created)

}

//consigment.proto
syntax = "proto3";

service ShippingService{
  rpc CreateConsignment(Consignment) returns (Response) {}

  // Создадим новый метод
  rpc GetConsignments(GetRequest) returns (Response) {}
}

message Consignment {
  int32 id = 1;
  string description = 2;
  int32 weight = 3;
  repeated Container containers = 4;
  string vessel_id = 5;
}

message Container {
  int32 id =1;
  string customer_id =2;
  string origin = 3;
  string user_id = 4;
}

// Создадим пустой запрос
message GetRequest {}

message Response {
  bool created = 1;
  Consignment consignment = 2;

  // Добавим повторяющиюся запись партий
  // в наше ответное сообщение
  repeated Consignment consignments = 3;
}

package main

import (
    "encoding/json"
    "io/ioutil"
    "log"
    "os"

    pbf "seaport/consignment"

    "golang.org/x/net/context"
    "google.golang.org/grpc"
)

const (
    address         = "localhost:50051"
    defaultFilename = "consignment.json"
)

//Функция парсит переданный фаил
func parseFile(file string) (*pbf.Consignment, error) {
    var consignment *pbf.Consignment
    data, err := ioutil.ReadFile(file)
    if err != nil {
        return nil, err
    }
    json.Unmarshal(data, &consignment)
    return consignment, err
}

func main() {
    // Установим соединение с сервером
    conn, err := grpc.Dial(address, grpc.WithInsecure())
    if err != nil {
        log.Fatalf("Не могу подключиться: %v", err)
    }
    defer conn.Close()
    client := pbf.NewShippingServiceClient(conn)

    // Передадим в обработку consignment.json,
    // иначе возьмём путь к файлу из аргументов командной строки
    file := defaultFilename
    if len(os.Args) > 1 {
        file = os.Args[1]
    }

    consignment, err := parseFile(file)

    if err != nil {
        log.Fatalf("Не возможно распарсить фаил: %v", err)
    }

    r, err := client.CreateConsignment(context.Background(), consignment)
    if err != nil {
        log.Fatalf("Не удалось создать: %v", err)
    }
    log.Printf("Создан: %t", r.Created)

    getAll, err := client.GetConsignments(context.Background(), &pbf.GetRequest{})
    if err != nil {
        log.Fatalf("Не возможно получить список партий: %v", err)
    }
    for _, v := range getAll.Consignments {
        log.Println(v)
    }

}