140 lines
4.6 KiB
Go
140 lines
4.6 KiB
Go
/*
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The client package provides a method to make synchronous, asynchronous and
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streaming requests to services. By default json and protobuf codecs are
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supported.
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import "github.com/micro/go-micro/client"
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c := client.NewClient()
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req := c.NewRequest("go.micro.srv.greeter", "Greeter.Hello", &greeter.Request{
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Name: "John",
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})
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rsp := &greeter.Response{}
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if err := c.Call(context.Background(), req, rsp); err != nil {
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return err
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}
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fmt.Println(rsp.Msg)
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*/
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package client
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import (
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"time"
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"golang.org/x/net/context"
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)
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// Client is the interface used to make requests to services.
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// It supports Request/Response via Transport and Publishing via the Broker.
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// It also supports bidiectional streaming of requests.
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type Client interface {
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Init(...Option) error
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Options() Options
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NewPublication(topic string, msg interface{}) Publication
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NewRequest(service, method string, req interface{}, reqOpts ...RequestOption) Request
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NewProtoRequest(service, method string, req interface{}, reqOpts ...RequestOption) Request
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NewJsonRequest(service, method string, req interface{}, reqOpts ...RequestOption) Request
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Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error
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CallRemote(ctx context.Context, addr string, req Request, rsp interface{}, opts ...CallOption) error
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Stream(ctx context.Context, req Request, opts ...CallOption) (Streamer, error)
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StreamRemote(ctx context.Context, addr string, req Request, opts ...CallOption) (Streamer, error)
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Publish(ctx context.Context, p Publication, opts ...PublishOption) error
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String() string
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}
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type Publication interface {
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Topic() string
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Message() interface{}
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ContentType() string
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}
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type Request interface {
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Service() string
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Method() string
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ContentType() string
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Request() interface{}
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// indicates whether the request will be a streaming one rather than unary
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Stream() bool
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}
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type Streamer interface {
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Context() context.Context
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Request() Request
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Send(interface{}) error
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Recv(interface{}) error
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Error() error
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Close() error
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}
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type Option func(*Options)
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type CallOption func(*CallOptions)
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type PublishOption func(*PublishOptions)
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type RequestOption func(*RequestOptions)
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var (
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DefaultClient Client = newRpcClient()
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DefaultRetries = 1
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DefaultRequestTimeout = time.Second * 5
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)
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// Makes a synchronous call to a service using the default client
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func Call(ctx context.Context, request Request, response interface{}, opts ...CallOption) error {
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return DefaultClient.Call(ctx, request, response, opts...)
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}
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// Makes a synchronous call to the specified address using the default client
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func CallRemote(ctx context.Context, address string, request Request, response interface{}, opts ...CallOption) error {
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return DefaultClient.CallRemote(ctx, address, request, response, opts...)
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}
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// Creates a streaming connection with a service and returns responses on the
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// channel passed in. It's upto the user to close the streamer.
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func Stream(ctx context.Context, request Request, opts ...CallOption) (Streamer, error) {
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return DefaultClient.Stream(ctx, request, opts...)
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}
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// Creates a streaming connection to the address specified.
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func StreamRemote(ctx context.Context, address string, request Request, opts ...CallOption) (Streamer, error) {
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return DefaultClient.StreamRemote(ctx, address, request, opts...)
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}
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// Publishes a publication using the default client. Using the underlying broker
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// set within the options.
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func Publish(ctx context.Context, p Publication) error {
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return DefaultClient.Publish(ctx, p)
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}
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// Creates a new client with the options passed in
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func NewClient(opt ...Option) Client {
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return newRpcClient(opt...)
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}
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// Creates a new publication using the default client
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func NewPublication(topic string, message interface{}) Publication {
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return DefaultClient.NewPublication(topic, message)
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}
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// Creates a new request using the default client. Content Type will
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// be set to the default within options and use the appropriate codec
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func NewRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
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return DefaultClient.NewRequest(service, method, request, reqOpts...)
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}
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// Creates a new protobuf request using the default client
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func NewProtoRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
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return DefaultClient.NewProtoRequest(service, method, request, reqOpts...)
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}
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// Creates a new json request using the default client
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func NewJsonRequest(service, method string, request interface{}, reqOpts ...RequestOption) Request {
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return DefaultClient.NewJsonRequest(service, method, request, reqOpts...)
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}
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func String() string {
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return DefaultClient.String()
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}
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