1
0
mirror of https://github.com/go-micro/go-micro.git synced 2025-01-11 17:18:28 +02:00
go-micro/examples/client/main.go
2020-12-26 15:21:29 +00:00

140 lines
3.2 KiB
Go

package main
import (
"fmt"
"context"
example "github.com/micro/go-micro/examples/server/proto/example"
"github.com/micro/go-micro/v2"
"github.com/micro/go-micro/v2/client"
"github.com/micro/go-micro/v2/metadata"
)
// publishes a message
func pub(p micro.Publisher) {
msg := &example.Message{
Say: "This is an async message",
}
if err := p.Publish(context.TODO(), msg); err != nil {
fmt.Println("pub err: ", err)
return
}
fmt.Printf("Published: %v\n", msg)
}
func call(i int, c client.Client) {
// Create new request to service go.micro.srv.example, method Example.Call
req := c.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 := c.Call(ctx, req, rsp); err != nil {
fmt.Println("call err: ", err, rsp)
return
}
fmt.Println("Call:", i, "rsp:", rsp.Msg)
}
func stream(i int, c client.Client) {
// 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 := c.NewRequest("go.micro.srv.example", "Example.Stream", &example.StreamingRequest{})
stream, err := c.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, c client.Client) {
// 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 := c.NewRequest("go.micro.srv.example", "Example.PingPong", &example.StreamingRequest{})
stream, err := c.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() {
service := micro.NewService()
service.Init()
p := micro.NewPublisher("topic.example", service.Client())
fmt.Println("\n--- Publisher example ---")
pub(p)
fmt.Println("\n--- Call example ---")
for i := 0; i < 10; i++ {
call(i, service.Client())
}
fmt.Println("\n--- Streamer example ---")
stream(10, service.Client())
fmt.Println("\n--- Ping Pong example ---")
pingPong(10, service.Client())
}