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Merge pull request #27 from BuoyantIO/flynn/grpc
Switch the color workload to gRPC
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| // SPDX-FileCopyrightText: 2024 Buoyant Inc. | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // | ||
| // Copyright 2022-2024 Buoyant Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); you may | ||
| // not use this file except in compliance with the License. You may obtain | ||
| // a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| "log/slog" | ||
| "net" | ||
| "net/http" | ||
| "os" | ||
|
|
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| "flag" | ||
| "fmt" | ||
|
|
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| "github.com/BuoyantIO/faces-demo/v2/pkg/faces" | ||
| "google.golang.org/grpc" | ||
| "google.golang.org/grpc/codes" | ||
| "google.golang.org/grpc/status" | ||
| ) | ||
|
|
||
| var ( | ||
| version = "dev" | ||
| commit = "none" | ||
| date = "unknown" | ||
| ) | ||
|
|
||
| type colorServer struct { | ||
| faces.UnimplementedColorServiceServer | ||
| provider *faces.ColorProvider | ||
| } | ||
|
|
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| func (srv *colorServer) Center(ctx context.Context, req *faces.ColorRequest) (*faces.ColorResponse, error) { | ||
| baseResp := srv.provider.Get(int(req.Row), int(req.Column)) | ||
|
|
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| slog.Debug(fmt.Sprintf("CENTER: %d, %d => %d, %s\n", req.Row, req.Column, baseResp.StatusCode, baseResp.Body)) | ||
|
|
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| switch baseResp.StatusCode { | ||
| case http.StatusOK: | ||
| color := baseResp.Body | ||
|
|
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| return &faces.ColorResponse{ | ||
| Color: color, | ||
| }, nil | ||
|
|
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| case http.StatusTooManyRequests: | ||
| return nil, status.Errorf(codes.ResourceExhausted, "rate limited: %s", baseResp.Body) | ||
|
|
||
| default: | ||
| return nil, status.Errorf(codes.Internal, "failed to get color: %s", baseResp.Body) | ||
| } | ||
| } | ||
|
|
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| func (srv *colorServer) Edge(ctx context.Context, req *faces.ColorRequest) (*faces.ColorResponse, error) { | ||
| baseResp := srv.provider.Get(int(req.Row), int(req.Column)) | ||
|
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| slog.Debug(fmt.Sprintf("EDGE: %d, %d => %d, %s\n", req.Row, req.Column, baseResp.StatusCode, baseResp.Body)) | ||
|
|
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| switch baseResp.StatusCode { | ||
| case http.StatusOK: | ||
| color := baseResp.Body | ||
|
|
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| return &faces.ColorResponse{ | ||
| Color: color, | ||
| }, nil | ||
|
|
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| case http.StatusTooManyRequests: | ||
| return nil, status.Errorf(codes.ResourceExhausted, "rate limited: %s", baseResp.Body) | ||
|
|
||
| default: | ||
| return nil, status.Errorf(codes.Internal, "failed to get color: %s", baseResp.Body) | ||
| } | ||
| } | ||
|
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| func main() { | ||
| logLevel := &slog.LevelVar{} // INFO | ||
|
|
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| slogOpts := &slog.HandlerOptions{ | ||
| Level: logLevel, | ||
| } | ||
|
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| logger := slog.New(slog.NewTextHandler(os.Stdout, slogOpts)) | ||
| slog.SetDefault(logger) | ||
|
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| logLevel.Set(slog.LevelDebug) | ||
|
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| // Define a command-line flag for the port number | ||
| port := flag.Int("port", 8000, "the port number to listen on") | ||
| flag.Parse() | ||
|
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| listener, err := net.Listen("tcp", fmt.Sprintf(":%d", *port)) | ||
|
|
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| if err != nil { | ||
| slog.Error(fmt.Sprintf("failed to listen: %v", err)) | ||
| os.Exit(1) | ||
| } | ||
|
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| slog.Info(fmt.Sprintf("listening on %s", listener.Addr())) | ||
| var grpcOpts []grpc.ServerOption | ||
|
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| cprv := faces.NewColorProviderFromEnvironment() | ||
| server := &colorServer{provider: cprv} | ||
|
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| grpcServer := grpc.NewServer(grpcOpts...) | ||
| faces.RegisterColorServiceServer(grpcServer, server) | ||
| grpcServer.Serve(listener) | ||
| } |
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