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| 1 | +// Command server runs the PR Cost API server. |
| 2 | +package main |
| 3 | + |
| 4 | +import ( |
| 5 | + "context" |
| 6 | + "errors" |
| 7 | + "flag" |
| 8 | + "log/slog" |
| 9 | + "net/http" |
| 10 | + "os" |
| 11 | + "os/signal" |
| 12 | + "runtime" |
| 13 | + "syscall" |
| 14 | + "time" |
| 15 | + |
| 16 | + "github.com/codeGROOVE-dev/prcost/internal/server" |
| 17 | +) |
| 18 | + |
| 19 | +const ( |
| 20 | + defaultPort = "8080" |
| 21 | + shutdownTimeout = 10 * time.Second |
| 22 | + readHeaderTimeout = 5 * time.Second |
| 23 | + writeTimeout = 30 * time.Second |
| 24 | + idleTimeout = 120 * time.Second |
| 25 | + maxHeaderBytes = 1 << 20 // 1MB |
| 26 | +) |
| 27 | + |
| 28 | +// Build variables - set by ldflags. |
| 29 | +var ( |
| 30 | + GitCommit = "unknown" |
| 31 | + GitBranch = "unknown" |
| 32 | + BuildTime = "unknown" |
| 33 | +) |
| 34 | + |
| 35 | +func main() { |
| 36 | + // Create root context |
| 37 | + ctx := context.Background() |
| 38 | + |
| 39 | + // Set up logging |
| 40 | + logger := slog.New(slog.NewTextHandler(os.Stdout, &slog.HandlerOptions{ |
| 41 | + AddSource: true, |
| 42 | + Level: slog.LevelInfo, |
| 43 | + })) |
| 44 | + slog.SetDefault(logger) |
| 45 | + |
| 46 | + // Log startup information |
| 47 | + logger.InfoContext(ctx, "starting server", |
| 48 | + "commit", GitCommit, |
| 49 | + "branch", GitBranch, |
| 50 | + "built", BuildTime, |
| 51 | + "go", runtime.Version(), |
| 52 | + "pid", os.Getpid()) |
| 53 | + |
| 54 | + // Parse flags |
| 55 | + var ( |
| 56 | + port = flag.String("port", "", "Port to run the server on") |
| 57 | + version = flag.Bool("version", false, "Print version and exit") |
| 58 | + corsOrigins = flag.String("cors-origins", |
| 59 | + "https://github.com,https://api.github.com", |
| 60 | + "Comma-separated list of allowed CORS origins (supports *.domain.com wildcards)") |
| 61 | + allowAllCors = flag.Bool("allow-all-cors", false, "Allow all CORS origins (use only for development)") |
| 62 | + rateLimit = flag.Int("rate-limit", 100, "Requests per second rate limit") |
| 63 | + rateBurst = flag.Int("rate-burst", 100, "Rate limit burst size") |
| 64 | + validateTokens = flag.Bool("validate-tokens", false, "Validate GitHub tokens server-side") |
| 65 | + githubAppID = flag.String("github-app-id", "", "GitHub App ID for token validation") |
| 66 | + githubAppKey = flag.String("github-app-key-file", "", "Path to GitHub App private key file") |
| 67 | + dataSource = flag.String("data-source", "turnserver", "Data source for PR data (turnserver or prx)") |
| 68 | + ) |
| 69 | + flag.Parse() |
| 70 | + |
| 71 | + if *version { |
| 72 | + logger.InfoContext(ctx, "prcost-server version", |
| 73 | + "commit", GitCommit, |
| 74 | + "branch", GitBranch, |
| 75 | + "built", BuildTime, |
| 76 | + "go", runtime.Version()) |
| 77 | + os.Exit(0) |
| 78 | + } |
| 79 | + |
| 80 | + // Determine port |
| 81 | + serverPort := *port |
| 82 | + if serverPort == "" { |
| 83 | + serverPort = os.Getenv("PORT") |
| 84 | + } |
| 85 | + if serverPort == "" { |
| 86 | + serverPort = defaultPort |
| 87 | + } |
| 88 | + |
| 89 | + // Create server |
| 90 | + prcostServer := server.New() |
| 91 | + prcostServer.SetCommit(GitCommit) |
| 92 | + prcostServer.SetCORSConfig(*corsOrigins, *allowAllCors) |
| 93 | + prcostServer.SetRateLimit(*rateLimit, *rateBurst) |
| 94 | + prcostServer.SetDataSource(*dataSource) |
| 95 | + if *validateTokens { |
| 96 | + if *githubAppID == "" || *githubAppKey == "" { |
| 97 | + logger.ErrorContext(ctx, "github app ID and key file are required when token validation is enabled") |
| 98 | + os.Exit(1) |
| 99 | + } |
| 100 | + if err := prcostServer.SetTokenValidation(*githubAppID, *githubAppKey); err != nil { |
| 101 | + logger.ErrorContext(ctx, "failed to configure token validation", "error", err) |
| 102 | + os.Exit(1) |
| 103 | + } |
| 104 | + } |
| 105 | + srv := &http.Server{ |
| 106 | + Addr: ":" + serverPort, |
| 107 | + Handler: prcostServer, |
| 108 | + ReadTimeout: readHeaderTimeout, |
| 109 | + ReadHeaderTimeout: readHeaderTimeout, |
| 110 | + WriteTimeout: writeTimeout, |
| 111 | + IdleTimeout: idleTimeout, |
| 112 | + MaxHeaderBytes: maxHeaderBytes, |
| 113 | + } |
| 114 | + |
| 115 | + // Start server in goroutine |
| 116 | + serverErrors := make(chan error, 1) |
| 117 | + go func() { |
| 118 | + logger.InfoContext(ctx, "server listening", "port", serverPort) |
| 119 | + serverErrors <- srv.ListenAndServe() |
| 120 | + }() |
| 121 | + |
| 122 | + // Set up signal handling |
| 123 | + sigChan := make(chan os.Signal, 1) |
| 124 | + signal.Notify(sigChan, os.Interrupt, syscall.SIGTERM, syscall.SIGQUIT) |
| 125 | + |
| 126 | + // Wait for shutdown signal or server error |
| 127 | + select { |
| 128 | + case err := <-serverErrors: |
| 129 | + if err != nil && !errors.Is(err, http.ErrServerClosed) { |
| 130 | + logger.ErrorContext(ctx, "server error", "error", err) |
| 131 | + os.Exit(1) |
| 132 | + } |
| 133 | + case sig := <-sigChan: |
| 134 | + logger.InfoContext(ctx, "received signal", "signal", sig) |
| 135 | + |
| 136 | + // Graceful shutdown |
| 137 | + logger.InfoContext(ctx, "starting graceful shutdown") |
| 138 | + |
| 139 | + shutdownCtx, cancel := context.WithTimeout(ctx, shutdownTimeout) |
| 140 | + |
| 141 | + // Shutdown application components |
| 142 | + prcostServer.Shutdown() |
| 143 | + |
| 144 | + if err := srv.Shutdown(shutdownCtx); err != nil { |
| 145 | + cancel() |
| 146 | + logger.WarnContext(ctx, "graceful shutdown failed", "error", err) |
| 147 | + // Force close |
| 148 | + if err := srv.Close(); err != nil { |
| 149 | + logger.ErrorContext(ctx, "server close error", "error", err) |
| 150 | + os.Exit(1) |
| 151 | + } |
| 152 | + } else { |
| 153 | + cancel() |
| 154 | + } |
| 155 | + } |
| 156 | + |
| 157 | + logger.InfoContext(ctx, "server stopped") |
| 158 | +} |
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