micro/client/client.go

130 lines
4.3 KiB
Go

/*
The client package provides a method to make synchronous, asynchronous and
streaming requests to services. By default json and protobuf codecs are
supported.
import "github.com/micro/go-micro/client"
c := client.NewClient()
req := c.NewRequest("go.micro.srv.greeter", "Greeter.Hello", &greeter.Request{
Name: "John",
})
rsp := &greeter.Response{}
if err := c.Call(context.Background(), req, rsp); err != nil {
return err
}
fmt.Println(rsp.Msg)
*/
package client
import (
"golang.org/x/net/context"
)
type Client interface {
NewPublication(topic string, msg interface{}) Publication
NewRequest(service, method string, req interface{}, reqOpts ...RequestOption) Request
NewProtoRequest(service, method string, req interface{}, reqOpts ...RequestOption) Request
NewJsonRequest(service, method string, req interface{}, reqOpts ...RequestOption) Request
Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error
CallRemote(ctx context.Context, addr string, req Request, rsp interface{}, opts ...CallOption) error
Stream(ctx context.Context, req Request, opts ...CallOption) (Streamer, error)
StreamRemote(ctx context.Context, addr string, req Request, opts ...CallOption) (Streamer, error)
Publish(ctx context.Context, p Publication, opts ...PublishOption) error
String() string
}
type Publication interface {
Topic() string
Message() interface{}
ContentType() string
}
type Request interface {
Service() string
Method() string
ContentType() string
Request() interface{}
// indicates whether the request will be a streaming one rather than unary
Stream() bool
}
type Streamer interface {
Context() context.Context
Request() Request
Send(interface{}) error
Recv(interface{}) error
Error() error
Close() error
}
type Option func(*Options)
type CallOption func(*CallOptions)
type PublishOption func(*PublishOptions)
type RequestOption func(*RequestOptions)
var (
DefaultClient Client = newRpcClient()
)
// Makes a synchronous call to a service using the default client
func Call(ctx context.Context, request Request, response interface{}, opts ...CallOption) error {
return DefaultClient.Call(ctx, request, response, opts...)
}
// Makes a synchronous call to the specified address using the default client
func CallRemote(ctx context.Context, address string, request Request, response interface{}, opts ...CallOption) error {
return DefaultClient.CallRemote(ctx, address, request, response, opts...)
}
// Creates a streaming connection with a service and returns responses on the
// channel passed in. It's upto the user to close the streamer.
func Stream(ctx context.Context, request Request, opts ...CallOption) (Streamer, error) {
return DefaultClient.Stream(ctx, request, opts...)
}
// Creates a streaming connection to the address specified.
func StreamRemote(ctx context.Context, address string, request Request, opts ...CallOption) (Streamer, error) {
return DefaultClient.StreamRemote(ctx, address, request, opts...)
}
// Publishes a publication using the default client. Using the underlying broker
// set within the options.
func Publish(ctx context.Context, p Publication) error {
return DefaultClient.Publish(ctx, p)
}
// Creates a new client with the options passed in
func NewClient(opt ...Option) Client {
return newRpcClient(opt...)
}
// Creates a new publication using the default client
func NewPublication(topic string, message interface{}) Publication {
return DefaultClient.NewPublication(topic, message)
}
// Creates a new request using the default client. Content Type will
// be set to the default within options and use the appropriate codec
func NewRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
return DefaultClient.NewRequest(service, method, request, reqOpts...)
}
// Creates a new protobuf request using the default client
func NewProtoRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
return DefaultClient.NewProtoRequest(service, method, request, reqOpts...)
}
// Creates a new json request using the default client
func NewJsonRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
return DefaultClient.NewJsonRequest(service, method, request, reqOpts...)
}
func String() string {
return DefaultClient.String()
}