117 lines
2.8 KiB
Go
117 lines
2.8 KiB
Go
package main
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import (
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"fmt"
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"os"
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"github.com/micro/cli"
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"github.com/micro/go-micro"
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"github.com/micro/go-micro/client"
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proto "github.com/micro/go-micro/examples/service/proto"
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"github.com/micro/go-micro/metadata"
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"github.com/micro/go-micro/server"
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"golang.org/x/net/context"
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)
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/*
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Example usage of top level service initialisation including wrappers
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*/
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type logWrapper struct {
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client.Client
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}
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func (l *logWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
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md, _ := metadata.FromContext(ctx)
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fmt.Printf("[Log Wrapper] ctx: %v service: %s method: %s\n", md, req.Service(), req.Method())
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return l.Client.Call(ctx, req, rsp)
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}
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// Implements client.Wrapper as logWrapper
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func logWrap(c client.Client) client.Client {
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return &logWrapper{c}
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}
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// Implements the server.HandlerWrapper
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func logHandlerWrapper(fn server.HandlerFunc) server.HandlerFunc {
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return func(ctx context.Context, req server.Request, rsp interface{}) error {
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fmt.Printf("[Log Wrapper] Before serving request method: %v\n", req.Method())
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err := fn(ctx, req, rsp)
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fmt.Println("[Log Wrapper] After serving request")
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return err
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}
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}
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type Greeter struct{}
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func (g *Greeter) Hello(ctx context.Context, req *proto.HelloRequest, rsp *proto.HelloResponse) error {
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rsp.Greeting = "Hello " + req.Name
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return nil
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}
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// Setup and the client
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func runClient(service micro.Service) {
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// Create new greeter client
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greeter := proto.NewGreeterClient("greeter", service.Client())
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// Call the greeter
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rsp, err := greeter.Hello(context.TODO(), &proto.HelloRequest{Name: "John"})
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if err != nil {
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fmt.Println(err)
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return
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}
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// Print response
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fmt.Println(rsp.Greeting)
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}
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func main() {
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// Create a new service. Optionally include some options here.
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service := micro.NewService(
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micro.Client(client.NewClient(client.Wrap(logWrap))),
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micro.Server(server.NewServer(server.WrapHandler(logHandlerWrapper))),
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micro.Name("greeter"),
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micro.Version("latest"),
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micro.Metadata(map[string]string{
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"type": "helloworld",
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}),
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// Setup some flags. Specify --run_client to run the client
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// Add runtime flags
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// We could do this below too
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micro.Flags(cli.BoolFlag{
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Name: "run_client",
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Usage: "Launch the client",
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}),
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)
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// Init will parse the command line flags. Any flags set will
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// override the above settings. Options defined here will
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// override anything set on the command line.
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service.Init(
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// Add runtime action
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// We could actually do this above
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micro.Action(func(c *cli.Context) {
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if c.Bool("run_client") {
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runClient(service)
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os.Exit(0)
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}
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}),
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)
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// By default we'll run the server unless the flags catch us
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// Setup the server
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// Register handler
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proto.RegisterGreeterHandler(service.Server(), new(Greeter))
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// Run the server
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if err := service.Run(); err != nil {
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fmt.Println(err)
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}
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}
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