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Add broker service implementation

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This commit is contained in:
Asim Aslam 2019-10-03 16:19:02 +01:00
parent b1163b9dee
commit 4de346920f
6 changed files with 800 additions and 0 deletions
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57
broker/service/handler/handler.go Normal file
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package handler
import (
"context"
"github.com/micro/go-micro/broker"
pb "github.com/micro/go-micro/broker/service/proto"
"github.com/micro/go-micro/errors"
)
type Broker struct {
Broker broker.Broker
}
func (b *Broker) Publish(ctx context.Context, req *pb.PublishRequest, rsp *pb.Empty) error {
err := b.Broker.Publish(req.Topic, &broker.Message{
Header: req.Message.Header,
Body: req.Message.Body,
})
if err != nil {
return errors.InternalServerError("go.micro.broker", err.Error())
}
return nil
}
func (b *Broker) Subscribe(ctx context.Context, req *pb.SubscribeRequest, stream pb.Broker_SubscribeStream) error {
errChan := make(chan error, 1)
// message handler to stream back messages from broker
handler := func(p broker.Event) error {
if err := stream.Send(&pb.Message{
Header: p.Message().Header,
Body: p.Message().Body,
}); err != nil {
select {
case errChan <- err:
return err
default:
return err
}
}
return nil
}
sub, err := b.Broker.Subscribe(req.Topic, handler, broker.Queue(req.Queue))
if err != nil {
return errors.InternalServerError("go.micro.broker", err.Error())
}
defer sub.Unsubscribe()
select {
case <-ctx.Done():
return nil
case <-errChan:
return err
}
}

173
broker/service/proto/broker.micro.go Normal file
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// Code generated by protoc-gen-micro. DO NOT EDIT.
// source: github.com/micro/go-micro/broker/proto/broker.proto
package go_micro_broker
import (
fmt "fmt"
proto "github.com/golang/protobuf/proto"
math "math"
)
import (
context "context"
client "github.com/micro/go-micro/client"
server "github.com/micro/go-micro/server"
)
// 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.ProtoPackageIsVersion3 // please upgrade the proto package
// Reference imports to suppress errors if they are not otherwise used.
var _ context.Context
var _ client.Option
var _ server.Option
// Client API for Broker service
type BrokerService interface {
Publish(ctx context.Context, in *PublishRequest, opts ...client.CallOption) (*Empty, error)
Subscribe(ctx context.Context, in *SubscribeRequest, opts ...client.CallOption) (Broker_SubscribeService, error)
}
type brokerService struct {
c client.Client
name string
}
func NewBrokerService(name string, c client.Client) BrokerService {
if c == nil {
c = client.NewClient()
}
if len(name) == 0 {
name = "go.micro.broker"
}
return &brokerService{
c: c,
name: name,
}
}
func (c *brokerService) Publish(ctx context.Context, in *PublishRequest, opts ...client.CallOption) (*Empty, error) {
req := c.c.NewRequest(c.name, "Broker.Publish", in)
out := new(Empty)
err := c.c.Call(ctx, req, out, opts...)
if err != nil {
return nil, err
}
return out, nil
}
func (c *brokerService) Subscribe(ctx context.Context, in *SubscribeRequest, opts ...client.CallOption) (Broker_SubscribeService, error) {
req := c.c.NewRequest(c.name, "Broker.Subscribe", &SubscribeRequest{})
stream, err := c.c.Stream(ctx, req, opts...)
if err != nil {
return nil, err
}
if err := stream.Send(in); err != nil {
return nil, err
}
return &brokerServiceSubscribe{stream}, nil
}
type Broker_SubscribeService interface {
SendMsg(interface{}) error
RecvMsg(interface{}) error
Close() error
Recv() (*Message, error)
}
type brokerServiceSubscribe struct {
stream client.Stream
}
func (x *brokerServiceSubscribe) Close() error {
return x.stream.Close()
}
func (x *brokerServiceSubscribe) SendMsg(m interface{}) error {
return x.stream.Send(m)
}
func (x *brokerServiceSubscribe) RecvMsg(m interface{}) error {
return x.stream.Recv(m)
}
func (x *brokerServiceSubscribe) Recv() (*Message, error) {
m := new(Message)
err := x.stream.Recv(m)
if err != nil {
return nil, err
}
return m, nil
}
// Server API for Broker service
type BrokerHandler interface {
Publish(context.Context, *PublishRequest, *Empty) error
Subscribe(context.Context, *SubscribeRequest, Broker_SubscribeStream) error
}
func RegisterBrokerHandler(s server.Server, hdlr BrokerHandler, opts ...server.HandlerOption) error {
type broker interface {
Publish(ctx context.Context, in *PublishRequest, out *Empty) error
Subscribe(ctx context.Context, stream server.Stream) error
}
type Broker struct {
broker
}
h := &brokerHandler{hdlr}
return s.Handle(s.NewHandler(&Broker{h}, opts...))
}
type brokerHandler struct {
BrokerHandler
}
func (h *brokerHandler) Publish(ctx context.Context, in *PublishRequest, out *Empty) error {
return h.BrokerHandler.Publish(ctx, in, out)
}
func (h *brokerHandler) Subscribe(ctx context.Context, stream server.Stream) error {
m := new(SubscribeRequest)
if err := stream.Recv(m); err != nil {
return err
}
return h.BrokerHandler.Subscribe(ctx, m, &brokerSubscribeStream{stream})
}
type Broker_SubscribeStream interface {
SendMsg(interface{}) error
RecvMsg(interface{}) error
Close() error
Send(*Message) error
}
type brokerSubscribeStream struct {
stream server.Stream
}
func (x *brokerSubscribeStream) Close() error {
return x.stream.Close()
}
func (x *brokerSubscribeStream) SendMsg(m interface{}) error {
return x.stream.Send(m)
}
func (x *brokerSubscribeStream) RecvMsg(m interface{}) error {
return x.stream.Recv(m)
}
func (x *brokerSubscribeStream) Send(m *Message) error {
return x.stream.Send(m)
}

364
broker/service/proto/broker.pb.go Normal file
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// Code generated by protoc-gen-go. DO NOT EDIT.
// source: github.com/micro/go-micro/broker/proto/broker.proto
package go_micro_broker
import (
context "context"
fmt "fmt"
proto "github.com/golang/protobuf/proto"
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.ProtoPackageIsVersion3 // please upgrade the proto package
type Empty struct {
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
}
func (m *Empty) Reset() { *m = Empty{} }
func (m *Empty) String() string { return proto.CompactTextString(m) }
func (*Empty) ProtoMessage() {}
func (*Empty) Descriptor() ([]byte, []int) {
return fileDescriptor_5edf81766900dd99, []int{0}
}
func (m *Empty) XXX_Unmarshal(b []byte) error {
return xxx_messageInfo_Empty.Unmarshal(m, b)
}
func (m *Empty) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
return xxx_messageInfo_Empty.Marshal(b, m, deterministic)
}
func (m *Empty) XXX_Merge(src proto.Message) {
xxx_messageInfo_Empty.Merge(m, src)
}
func (m *Empty) XXX_Size() int {
return xxx_messageInfo_Empty.Size(m)
}
func (m *Empty) XXX_DiscardUnknown() {
xxx_messageInfo_Empty.DiscardUnknown(m)
}
var xxx_messageInfo_Empty proto.InternalMessageInfo
type PublishRequest struct {
Topic string `protobuf:"bytes,1,opt,name=topic,proto3" json:"topic,omitempty"`
Message *Message `protobuf:"bytes,2,opt,name=message,proto3" json:"message,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
}
func (m *PublishRequest) Reset() { *m = PublishRequest{} }
func (m *PublishRequest) String() string { return proto.CompactTextString(m) }
func (*PublishRequest) ProtoMessage() {}
func (*PublishRequest) Descriptor() ([]byte, []int) {
return fileDescriptor_5edf81766900dd99, []int{1}
}
func (m *PublishRequest) XXX_Unmarshal(b []byte) error {
return xxx_messageInfo_PublishRequest.Unmarshal(m, b)
}
func (m *PublishRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
return xxx_messageInfo_PublishRequest.Marshal(b, m, deterministic)
}
func (m *PublishRequest) XXX_Merge(src proto.Message) {
xxx_messageInfo_PublishRequest.Merge(m, src)
}
func (m *PublishRequest) XXX_Size() int {
return xxx_messageInfo_PublishRequest.Size(m)
}
func (m *PublishRequest) XXX_DiscardUnknown() {
xxx_messageInfo_PublishRequest.DiscardUnknown(m)
}
var xxx_messageInfo_PublishRequest proto.InternalMessageInfo
func (m *PublishRequest) GetTopic() string {
if m != nil {
return m.Topic
}
return ""
}
func (m *PublishRequest) GetMessage() *Message {
if m != nil {
return m.Message
}
return nil
}
type SubscribeRequest struct {
Topic string `protobuf:"bytes,1,opt,name=topic,proto3" json:"topic,omitempty"`
Queue string `protobuf:"bytes,2,opt,name=queue,proto3" json:"queue,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
}
func (m *SubscribeRequest) Reset() { *m = SubscribeRequest{} }
func (m *SubscribeRequest) String() string { return proto.CompactTextString(m) }
func (*SubscribeRequest) ProtoMessage() {}
func (*SubscribeRequest) Descriptor() ([]byte, []int) {
return fileDescriptor_5edf81766900dd99, []int{2}
}
func (m *SubscribeRequest) XXX_Unmarshal(b []byte) error {
return xxx_messageInfo_SubscribeRequest.Unmarshal(m, b)
}
func (m *SubscribeRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
return xxx_messageInfo_SubscribeRequest.Marshal(b, m, deterministic)
}
func (m *SubscribeRequest) XXX_Merge(src proto.Message) {
xxx_messageInfo_SubscribeRequest.Merge(m, src)
}
func (m *SubscribeRequest) XXX_Size() int {
return xxx_messageInfo_SubscribeRequest.Size(m)
}
func (m *SubscribeRequest) XXX_DiscardUnknown() {
xxx_messageInfo_SubscribeRequest.DiscardUnknown(m)
}
var xxx_messageInfo_SubscribeRequest proto.InternalMessageInfo
func (m *SubscribeRequest) GetTopic() string {
if m != nil {
return m.Topic
}
return ""
}
func (m *SubscribeRequest) GetQueue() string {
if m != nil {
return m.Queue
}
return ""
}
type Message struct {
Header map[string]string `protobuf:"bytes,1,rep,name=header,proto3" json:"header,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
Body []byte `protobuf:"bytes,2,opt,name=body,proto3" json:"body,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
}
func (m *Message) Reset() { *m = Message{} }
func (m *Message) String() string { return proto.CompactTextString(m) }
func (*Message) ProtoMessage() {}
func (*Message) Descriptor() ([]byte, []int) {
return fileDescriptor_5edf81766900dd99, []int{3}
}
func (m *Message) XXX_Unmarshal(b []byte) error {
return xxx_messageInfo_Message.Unmarshal(m, b)
}
func (m *Message) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
return xxx_messageInfo_Message.Marshal(b, m, deterministic)
}
func (m *Message) XXX_Merge(src proto.Message) {
xxx_messageInfo_Message.Merge(m, src)
}
func (m *Message) XXX_Size() int {
return xxx_messageInfo_Message.Size(m)
}
func (m *Message) XXX_DiscardUnknown() {
xxx_messageInfo_Message.DiscardUnknown(m)
}
var xxx_messageInfo_Message proto.InternalMessageInfo
func (m *Message) GetHeader() map[string]string {
if m != nil {
return m.Header
}
return nil
}
func (m *Message) GetBody() []byte {
if m != nil {
return m.Body
}
return nil
}
func init() {
proto.RegisterType((*Empty)(nil), "go.micro.broker.Empty")
proto.RegisterType((*PublishRequest)(nil), "go.micro.broker.PublishRequest")
proto.RegisterType((*SubscribeRequest)(nil), "go.micro.broker.SubscribeRequest")
proto.RegisterType((*Message)(nil), "go.micro.broker.Message")
proto.RegisterMapType((map[string]string)(nil), "go.micro.broker.Message.HeaderEntry")
}
func init() {
proto.RegisterFile("github.com/micro/go-micro/broker/proto/broker.proto", fileDescriptor_5edf81766900dd99)
}
var fileDescriptor_5edf81766900dd99 = []byte{
// 309 bytes of a gzipped FileDescriptorProto
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0x02, 0x2b, 0x02, 0x00, 0x00,
}
// 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
// BrokerClient is the client API for Broker service.
//
// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
type BrokerClient interface {
Publish(ctx context.Context, in *PublishRequest, opts ...grpc.CallOption) (*Empty, error)
Subscribe(ctx context.Context, in *SubscribeRequest, opts ...grpc.CallOption) (Broker_SubscribeClient, error)
}
type brokerClient struct {
cc *grpc.ClientConn
}
func NewBrokerClient(cc *grpc.ClientConn) BrokerClient {
return &brokerClient{cc}
}
func (c *brokerClient) Publish(ctx context.Context, in *PublishRequest, opts ...grpc.CallOption) (*Empty, error) {
out := new(Empty)
err := c.cc.Invoke(ctx, "/go.micro.broker.Broker/Publish", in, out, opts...)
if err != nil {
return nil, err
}
return out, nil
}
func (c *brokerClient) Subscribe(ctx context.Context, in *SubscribeRequest, opts ...grpc.CallOption) (Broker_SubscribeClient, error) {
stream, err := c.cc.NewStream(ctx, &_Broker_serviceDesc.Streams[0], "/go.micro.broker.Broker/Subscribe", opts...)
if err != nil {
return nil, err
}
x := &brokerSubscribeClient{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
}
type Broker_SubscribeClient interface {
Recv() (*Message, error)
grpc.ClientStream
}
type brokerSubscribeClient struct {
grpc.ClientStream
}
func (x *brokerSubscribeClient) Recv() (*Message, error) {
m := new(Message)
if err := x.ClientStream.RecvMsg(m); err != nil {
return nil, err
}
return m, nil
}
// BrokerServer is the server API for Broker service.
type BrokerServer interface {
Publish(context.Context, *PublishRequest) (*Empty, error)
Subscribe(*SubscribeRequest, Broker_SubscribeServer) error
}
func RegisterBrokerServer(s *grpc.Server, srv BrokerServer) {
s.RegisterService(&_Broker_serviceDesc, srv)
}
func _Broker_Publish_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
in := new(PublishRequest)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil {
return srv.(BrokerServer).Publish(ctx, in)
}
info := &grpc.UnaryServerInfo{
Server: srv,
FullMethod: "/go.micro.broker.Broker/Publish",
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) {
return srv.(BrokerServer).Publish(ctx, req.(*PublishRequest))
}
return interceptor(ctx, in, info, handler)
}
func _Broker_Subscribe_Handler(srv interface{}, stream grpc.ServerStream) error {
m := new(SubscribeRequest)
if err := stream.RecvMsg(m); err != nil {
return err
}
return srv.(BrokerServer).Subscribe(m, &brokerSubscribeServer{stream})
}
type Broker_SubscribeServer interface {
Send(*Message) error
grpc.ServerStream
}
type brokerSubscribeServer struct {
grpc.ServerStream
}
func (x *brokerSubscribeServer) Send(m *Message) error {
return x.ServerStream.SendMsg(m)
}
var _Broker_serviceDesc = grpc.ServiceDesc{
ServiceName: "go.micro.broker.Broker",
HandlerType: (*BrokerServer)(nil),
Methods: []grpc.MethodDesc{
{
MethodName: "Publish",
Handler: _Broker_Publish_Handler,
},
},
Streams: []grpc.StreamDesc{
{
StreamName: "Subscribe",
Handler: _Broker_Subscribe_Handler,
ServerStreams: true,
},
},
Metadata: "github.com/micro/go-micro/broker/proto/broker.proto",
}

25
broker/service/proto/broker.proto Normal file
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@ -0,0 +1,25 @@
syntax = "proto3";
package go.micro.broker;
service Broker {
rpc Publish(PublishRequest) returns (Empty) {};
rpc Subscribe(SubscribeRequest) returns (stream Message) {};
}
message Empty {}
message PublishRequest {
string topic = 1;
Message message = 2;
}
message SubscribeRequest {
string topic = 1;
string queue = 2;
}
message Message {
map<string,string> header = 1;
bytes body = 2;
}

102
broker/service/service.go Normal file
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@ -0,0 +1,102 @@
// Package service provides the broker service client
package service
import (
"context"
"github.com/micro/go-micro/broker"
pb "github.com/micro/go-micro/broker/service/proto"
"github.com/micro/go-micro/client"
)
type serviceBroker struct {
Addrs []string
Client pb.BrokerService
options broker.Options
}
var (
DefaultName = "go.micro.broker"
)
func (b *serviceBroker) Address() string {
return b.Addrs[0]
}
func (b *serviceBroker) Connect() error {
return nil
}
func (b *serviceBroker) Disconnect() error {
return nil
}
func (b *serviceBroker) Init(opts ...broker.Option) error {
for _, o := range opts {
o(&b.options)
}
return nil
}
func (b *serviceBroker) Options() broker.Options {
return b.options
}
func (b *serviceBroker) Publish(topic string, msg *broker.Message, opts ...broker.PublishOption) error {
_, err := b.Client.Publish(context.TODO(), &pb.PublishRequest{
Topic: topic,
Message: &pb.Message{
Header: msg.Header,
Body: msg.Body,
},
}, client.WithAddress(b.Addrs...))
return err
}
func (b *serviceBroker) Subscribe(topic string, handler broker.Handler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
var options broker.SubscribeOptions
for _, o := range opts {
o(&options)
}
stream, err := b.Client.Subscribe(context.TODO(), &pb.SubscribeRequest{
Topic: topic,
Queue: options.Queue,
}, client.WithAddress(b.Addrs...))
if err != nil {
return nil, err
}
sub := &serviceSub{
topic: topic,
queue: options.Queue,
handler: handler,
stream: stream,
closed: make(chan bool),
options: options,
}
go sub.run()
return sub, nil
}
func (b *serviceBroker) String() string {
return "service"
}
func NewBroker(opts ...broker.Option) broker.Broker {
var options broker.Options
for _, o := range opts {
o(&options)
}
addrs := options.Addrs
if len(addrs) == 0 {
addrs = []string{"127.0.0.1:8001"}
}
return &serviceBroker{
Addrs: addrs,
Client: pb.NewBrokerService(DefaultName, client.DefaultClient),
options: options,
}
}

79
broker/service/subscriber.go Normal file
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@ -0,0 +1,79 @@
package service
import (
"github.com/micro/go-micro/broker"
pb "github.com/micro/go-micro/broker/service/proto"
)
type serviceSub struct {
topic string
queue string
handler broker.Handler
stream pb.Broker_SubscribeService
closed chan bool
options broker.SubscribeOptions
}
type serviceEvent struct {
topic string
message *broker.Message
}
func (s *serviceEvent) Topic() string {
return s.topic
}
func (s *serviceEvent) Message() *broker.Message {
return s.message
}
func (s *serviceEvent) Ack() error {
return nil
}
func (s *serviceSub) run() {
exit := make(chan bool)
go func() {
select {
case <-exit:
return
case <-s.closed:
s.stream.Close()
}
}()
for {
// TODO: do not fail silently
msg, err := s.stream.Recv()
if err != nil {
close(exit)
return
}
// TODO: handle error
s.handler(&serviceEvent{
topic: s.topic,
message: &broker.Message{
Header: msg.Header,
Body: msg.Body,
},
})
}
}
func (s *serviceSub) Options() broker.SubscribeOptions {
return s.options
}
func (s *serviceSub) Topic() string {
return s.topic
}
func (s *serviceSub) Unsubscribe() error {
select {
case <-s.closed:
return nil
default:
close(s.closed)
}
return nil
}