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main.go
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main.go
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package main
import (
"context"
"fmt"
"time"
example "github.com/micro/examples/server/proto/example"
"github.com/micro/go-micro/client"
"github.com/micro/go-micro/cmd"
"github.com/micro/go-micro/metadata"
"github.com/micro/go-os/trace"
"github.com/micro/go-plugins/trace/zipkin"
)
// 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 := metadata.NewContext(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 := metadata.NewContext(context.Background(), map[string]string{
"X-User-Id": "john",
"X-From-Id": "script",
})
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 stream(i int) {
// Create new request to service go.micro.srv.example, method Example.Call
// Request can be empty as its actually ignored and merely used to call the handler
req := client.NewRequest("go.micro.srv.example", "Example.Stream", &example.StreamingRequest{})
stream, err := client.Stream(context.Background(), req)
if err != nil {
fmt.Println("err:", err)
return
}
if err := stream.Send(&example.StreamingRequest{Count: int64(i)}); err != nil {
fmt.Println("err:", err)
return
}
for stream.Error() == nil {
rsp := &example.StreamingResponse{}
err := stream.Recv(rsp)
if err != nil {
fmt.Println("recv err", err)
break
}
fmt.Println("Stream: rsp:", rsp.Count)
}
if stream.Error() != nil {
fmt.Println("stream err:", err)
return
}
if err := stream.Close(); err != nil {
fmt.Println("stream close err:", err)
}
}
func pingPong(i int) {
// Create new request to service go.micro.srv.example, method Example.Call
// Request can be empty as its actually ignored and merely used to call the handler
req := client.NewRequest("go.micro.srv.example", "Example.PingPong", &example.StreamingRequest{})
stream, err := client.Stream(context.Background(), req)
if err != nil {
fmt.Println("err:", err)
return
}
for j := 0; j < i; j++ {
if err := stream.Send(&example.Ping{Stroke: int64(j + 1)}); err != nil {
fmt.Println("err:", err)
return
}
rsp := &example.Pong{}
err := stream.Recv(rsp)
if err != nil {
fmt.Println("recv err", err)
break
}
fmt.Printf("Sent ping %v got pong %v\n", j+1, rsp.Stroke)
}
if stream.Error() != nil {
fmt.Println("stream err:", err)
return
}
if err := stream.Close(); err != nil {
fmt.Println("stream close err:", err)
}
}
func main() {
cmd.Init()
t := zipkin.NewTrace(
trace.Collectors("192.168.99.100:9092"),
)
defer t.Close()
client.DefaultClient = client.NewClient(
client.Wrap(
trace.ClientWrapper(t, nil),
),
)
fmt.Println("\n--- Traced Call example ---")
for i := 0; i < 10; i++ {
call(i)
}
/*
fmt.Println("\n--- Streamer example ---\n")
stream(10)
fmt.Println("\n--- Ping Pong example ---\n")
pingPong(10)
fmt.Println("\n--- Publisher example ---\n")
pub()
*/
<-time.After(time.Second * 10)
}