mirror of
https://github.com/linka-cloud/grpc.git
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71 lines
2.2 KiB
Go
71 lines
2.2 KiB
Go
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// Copyright 2017 Michal Witkowski. All Rights Reserved.
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// See LICENSE for licensing terms.
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package proxy_test
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import (
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"context"
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"log"
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"strings"
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"google.golang.org/grpc"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/metadata"
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"google.golang.org/grpc/status"
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"go.linka.cloud/grpc-toolkit/proxy"
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)
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var (
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director proxy.StreamDirector
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)
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func ExampleNewProxy() {
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dst, err := grpc.Dial("example.com")
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if err != nil {
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log.Fatalf("dialing example.org: %v", err)
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}
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proxy := proxy.NewProxy(dst)
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_ = proxy
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}
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func ExampleRegisterService() {
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// A gRPC server with the proxying codec enabled.
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server := grpc.NewServer()
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// Register a TestService with 4 of its methods explicitly.
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proxy.RegisterService(server, director,
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"mwitkow.testproto.TestService",
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"PingEmpty", "Ping", "PingError", "PingList")
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}
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func ExampleTransparentHandler() {
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grpc.NewServer(
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grpc.UnknownServiceHandler(proxy.TransparentHandler(director)))
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}
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// Provides a simple example of a director that shields internal services and dials a staging or production backend.
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// This is a *very naive* implementation that creates a new connection on every request. Consider using pooling.
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func ExampleStreamDirector() {
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director = func(ctx context.Context, fullMethodName string) (context.Context, grpc.ClientConnInterface, error) {
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// Make sure we never forward internal services.
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if strings.HasPrefix(fullMethodName, "/com.example.internal.") {
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return nil, nil, status.Errorf(codes.Unimplemented, "Unknown method")
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}
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md, ok := metadata.FromIncomingContext(ctx)
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// Copy the inbound metadata explicitly.
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outCtx := metadata.NewOutgoingContext(ctx, md.Copy())
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if ok {
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// Decide on which backend to dial
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if val, exists := md[":authority"]; exists && val[0] == "staging.api.example.com" {
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// Make sure we use DialContext so the dialing can be cancelled/time out together with the context.
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conn, err := grpc.DialContext(ctx, "api-service.staging.svc.local")
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return outCtx, conn, err
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} else if val, exists := md[":authority"]; exists && val[0] == "api.example.com" {
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conn, err := grpc.DialContext(ctx, "api-service.prod.svc.local")
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return outCtx, conn, err
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}
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}
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return nil, nil, status.Errorf(codes.Unimplemented, "Unknown method")
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}
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}
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