micro/client/rpc_client.go
2015-11-25 19:50:05 +00:00

241 lines
5.8 KiB
Go

package client
import (
"encoding/json"
"fmt"
"net/http"
"sync"
"github.com/micro/go-micro/broker"
c "github.com/micro/go-micro/context"
"github.com/micro/go-micro/errors"
"github.com/micro/go-micro/registry"
"github.com/micro/go-micro/transport"
rpc "github.com/youtube/vitess/go/rpcplus"
"github.com/golang/protobuf/proto"
"golang.org/x/net/context"
)
type headerRoundTripper struct {
r http.RoundTripper
}
type rpcClient struct {
once sync.Once
opts options
}
func newRpcClient(opt ...Option) Client {
opts := options{
codecs: make(map[string]CodecFunc),
}
for _, o := range opt {
o(&opts)
}
if len(opts.contentType) == 0 {
opts.contentType = defaultContentType
}
if opts.transport == nil {
opts.transport = transport.DefaultTransport
}
if opts.broker == nil {
opts.broker = broker.DefaultBroker
}
var once sync.Once
return &rpcClient{
once: once,
opts: opts,
}
}
func (t *headerRoundTripper) RoundTrip(r *http.Request) (*http.Response, error) {
r.Header.Set("X-Client-Version", "1.0")
return t.r.RoundTrip(r)
}
func (r *rpcClient) codecFunc(contentType string) (codecFunc, error) {
if cf, ok := r.opts.codecs[contentType]; ok {
return codecWrap(cf), nil
}
if cf, ok := defaultCodecs[contentType]; ok {
return cf, nil
}
return nil, fmt.Errorf("Unsupported Content-Type: %s", contentType)
}
func (r *rpcClient) call(ctx context.Context, address string, request Request, response interface{}) error {
msg := &transport.Message{
Header: make(map[string]string),
}
md, ok := c.GetMetadata(ctx)
if ok {
for k, v := range md {
msg.Header[k] = v
}
}
msg.Header["Content-Type"] = request.ContentType()
cf, err := r.codecFunc(request.ContentType())
if err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
c, err := r.opts.transport.Dial(address)
if err != nil {
return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
}
defer c.Close()
client := rpc.NewClientWithCodec(newRpcPlusCodec(msg, c, cf))
err = client.Call(ctx, request.Method(), request.Request(), response)
if err != nil {
return err
}
return client.Close()
}
func (r *rpcClient) stream(ctx context.Context, address string, request Request, responseChan interface{}) (Streamer, error) {
msg := &transport.Message{
Header: make(map[string]string),
}
md, ok := c.GetMetadata(ctx)
if ok {
for k, v := range md {
msg.Header[k] = v
}
}
msg.Header["Content-Type"] = request.ContentType()
cf, err := r.codecFunc(request.ContentType())
if err != nil {
return nil, errors.InternalServerError("go.micro.client", err.Error())
}
c, err := r.opts.transport.Dial(address, transport.WithStream())
if err != nil {
return nil, errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
}
client := rpc.NewClientWithCodec(newRpcPlusCodec(msg, c, cf))
call := client.StreamGo(request.Method(), request.Request(), responseChan)
return &rpcStream{
request: request,
call: call,
client: client,
}, nil
}
func (r *rpcClient) CallRemote(ctx context.Context, address string, request Request, response interface{}) error {
return r.call(ctx, address, request, response)
}
// TODO: Call(..., opts *Options) error {
func (r *rpcClient) Call(ctx context.Context, request Request, response interface{}) error {
service, err := registry.GetService(request.Service())
if err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
node, err := nodeSelector(service)
if err != nil {
return err
}
address := node.Address
if node.Port > 0 {
address = fmt.Sprintf("%s:%d", address, node.Port)
}
return r.call(ctx, address, request, response)
}
func (r *rpcClient) StreamRemote(ctx context.Context, address string, request Request, responseChan interface{}) (Streamer, error) {
return r.stream(ctx, address, request, responseChan)
}
func (r *rpcClient) Stream(ctx context.Context, request Request, responseChan interface{}) (Streamer, error) {
service, err := registry.GetService(request.Service())
if err != nil {
return nil, errors.InternalServerError("go.micro.client", err.Error())
}
node, err := nodeSelector(service)
if err != nil {
return nil, err
}
address := node.Address
if node.Port > 0 {
address = fmt.Sprintf("%s:%d", address, node.Port)
}
return r.stream(ctx, address, request, responseChan)
}
func (r *rpcClient) Publish(ctx context.Context, p Publication) error {
md, ok := c.GetMetadata(ctx)
if !ok {
md = make(map[string]string)
}
md["Content-Type"] = p.ContentType()
// encode message body
var body []byte
switch p.ContentType() {
case "application/octet-stream":
b, err := proto.Marshal(p.Message().(proto.Message))
if err != nil {
return err
}
body = b
case "application/json":
b, err := json.Marshal(p.Message())
if err != nil {
return err
}
body = b
}
r.once.Do(func() {
r.opts.broker.Connect()
})
return r.opts.broker.Publish(p.Topic(), &broker.Message{
Header: md,
Body: body,
})
}
func (r *rpcClient) NewPublication(topic string, message interface{}) Publication {
return newRpcPublication(topic, message, r.opts.contentType)
}
func (r *rpcClient) NewProtoPublication(topic string, message interface{}) Publication {
return newRpcPublication(topic, message, "application/octet-stream")
}
func (r *rpcClient) NewRequest(service, method string, request interface{}) Request {
return newRpcRequest(service, method, request, r.opts.contentType)
}
func (r *rpcClient) NewProtoRequest(service, method string, request interface{}) Request {
return newRpcRequest(service, method, request, "application/octet-stream")
}
func (r *rpcClient) NewJsonRequest(service, method string, request interface{}) Request {
return newRpcRequest(service, method, request, "application/json")
}