func (s *rpcServer) accept(sock transport.Socket) {
defer func() {
if r := recover(); r != nil {
log.Error(r, string(debug.Stack()))
sock.Close()
}
}()
var msg transport.Message
if err := sock.Recv(&msg); err != nil {
return
}
ct := msg.Header["Content-Type"]
cf, err := s.newCodec(ct)
// TODO: needs better error handling
if err != nil {
sock.Send(&transport.Message{
Header: map[string]string{
"Content-Type": "text/plain",
},
Body: []byte(err.Error()),
})
sock.Close()
return
}
codec := newRpcPlusCodec(&msg, sock, cf)
// strip our headers
hdr := make(map[string]string)
for k, v := range msg.Header {
hdr[k] = v
}
delete(hdr, "Content-Type")
ctx := c.WithMetadata(context.Background(), hdr)
// TODO: needs better error handling
if err := s.rpc.serveRequest(ctx, codec, ct); err != nil {
log.Errorf("Unexpected error serving request, closing socket: %v", err)
sock.Close()
}
}
// publishes a message
func pub() {
msg := client.NewPublication("topic.go.micro.srv.example", &example.Message{
Say: "This is a publication",
})
// create context with metadata
ctx := c.WithMetadata(context.Background(), map[string]string{
"X-User-Id": "john",
"X-From-Id": "script",
})
// publish message
if err := client.Publish(ctx, msg); err != nil {
fmt.Println("pub err: ", err)
return
}
fmt.Printf("Published: %v\n", msg)
}
func call(i int) {
// Create new request to service go.micro.srv.example, method Example.Call
req := client.NewRequest("go.micro.srv.example", "Example.Call", &example.Request{
Name: "John",
})
// create context with metadata
ctx := c.WithMetadata(context.Background(), map[string]string{
"datacenter": "local",
})
rsp := &example.Response{}
// Call service
if err := client.Call(ctx, req, rsp); err != nil {
fmt.Println("call err: ", err, rsp)
return
}
fmt.Println("Call:", i, "rsp:", rsp.Msg)
}
func main() {
cmd.Init()
// use the generated client stub
cl := hello.NewSayClient("go.micro.srv.greeter", client.DefaultClient)
// Set arbitrary headers in context
ctx := c.WithMetadata(context.Background(), map[string]string{
"X-User-Id": "john",
"X-From-Id": "script",
})
rsp, err := cl.Hello(ctx, &hello.Request{
Name: "John",
})
if err != nil {
fmt.Println(err)
return
}
fmt.Println(rsp.Msg)
}
func main() {
cmd.Init()
// Create new request to service go.micro.srv.greeter, method Say.Hello
req := client.NewRequest("go.micro.srv.greeter", "Say.Hello", &hello.Request{
Name: "John",
})
// Set arbitrary headers in context
ctx := c.WithMetadata(context.Background(), map[string]string{
"X-User-Id": "john",
"X-From-Id": "script",
})
rsp := &hello.Response{}
// Call service
if err := client.Call(ctx, req, rsp); err != nil {
fmt.Println(err)
return
}
fmt.Println(rsp.Msg)
}
func (s *rpcServer) createSubHandler(sb *subscriber, opts Options) broker.Handler {
return func(p broker.Publication) error {
msg := p.Message()
ct := msg.Header["Content-Type"]
cf, err := s.newCodec(ct)
if err != nil {
return err
}
hdr := make(map[string]string)
for k, v := range msg.Header {
hdr[k] = v
}
delete(hdr, "Content-Type")
ctx := c.WithMetadata(context.Background(), hdr)
for i := 0; i < len(sb.handlers); i++ {
handler := sb.handlers[i]
var isVal bool
var req reflect.Value
if handler.reqType.Kind() == reflect.Ptr {
req = reflect.New(handler.reqType.Elem())
} else {
req = reflect.New(handler.reqType)
isVal = true
}
if isVal {
req = req.Elem()
}
b := &buffer{bytes.NewBuffer(msg.Body)}
co := cf(b)
defer co.Close()
if err := co.ReadHeader(&codec.Message{}, codec.Publication); err != nil {
return err
}
if err := co.ReadBody(req.Interface()); err != nil {
return err
}
fn := func(ctx context.Context, msg Publication) error {
var vals []reflect.Value
if sb.typ.Kind() != reflect.Func {
vals = append(vals, sb.rcvr)
}
if handler.ctxType != nil {
vals = append(vals, reflect.ValueOf(ctx))
}
vals = append(vals, reflect.ValueOf(msg.Message()))
returnValues := handler.method.Call(vals)
if err := returnValues[0].Interface(); err != nil {
return err.(error)
}
return nil
}
for i := len(opts.SubWrappers); i > 0; i-- {
fn = opts.SubWrappers[i-1](fn)
}
go fn(ctx, &rpcPublication{
topic: sb.topic,
contentType: ct,
message: req.Interface(),
})
}
return nil
}
}
func (t *traceWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
ctx = c.WithMetadata(ctx, map[string]string{
"X-Trace-Id": fmt.Sprintf("%d", time.Now().Unix()),
})
return t.Client.Call(ctx, req, rsp)
}
func (c *clientWrapper) Publish(ctx context.Context, p client.Publication, opts ...client.PublishOption) error {
ctx = cx.WithMetadata(ctx, c.headers)
return c.Client.Publish(ctx, p, opts...)
}
func (c *clientWrapper) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Streamer, error) {
ctx = cx.WithMetadata(ctx, c.headers)
return c.Client.Stream(ctx, req, opts...)
}
func (c *clientWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
ctx = cx.WithMetadata(ctx, c.headers)
return c.Client.Call(ctx, req, rsp, opts...)
}