john-okeefe
9ccff320a1
Replace direct error equality checks (err == pgx.ErrNoRows, err != http.ErrServerClosed) with the idiomatic errors.Is() function throughout handlers, services, middleware, and app startup. This correctly handles wrapped error chains. Also replace a raw type assertion (*HTTPError) with errors.AsType[*HTTPError]() in the error handler middleware for consistency. Additionally, rename shadowed variables for clarity: - sidecar.go: config -> sidecarConfig, systemConfig (shadowed package-level vars) - media_scanner.go: uuid -> uuidString (shadowed the uuid package import)
116 lines
2.6 KiB
Go
116 lines
2.6 KiB
Go
package app
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import (
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"context"
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"errors"
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"log"
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"net/http"
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"os"
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"os/signal"
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"sync"
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"syscall"
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"time"
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"github.com/labstack/echo/v5"
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)
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// App manages application lifecycle and graceful shutdown
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type App struct {
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echo *echo.Echo
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server *http.Server
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shutdownTimeout time.Duration
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shutdownMutex sync.Mutex
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shutdownDone chan struct{}
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}
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// New creates a new App instance
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func New(echo *echo.Echo) *App {
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return &App{
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echo: echo,
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server: nil,
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shutdownTimeout: 30 * time.Second,
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shutdownDone: make(chan struct{}),
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}
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}
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func (a *App) StartServer(addr string) error {
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a.server = &http.Server{
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Addr: addr,
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Handler: a.echo,
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}
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// Start HTTP server in background
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go func() {
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if err := a.server.ListenAndServe(); err != nil && errors.Is(err, http.ErrServerClosed) {
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log.Fatalf("Server failed to start: %v", err)
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}
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}()
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return nil
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}
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// Start begins all background services and blocks until shutdown signal
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func (a *App) Start() error {
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log.Println("Starting application lifecycle management...")
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// Setup signal handling for graceful shutdown
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sigChan := make(chan os.Signal, 1)
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signal.Notify(sigChan,
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syscall.SIGINT, // Ctrl+C
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syscall.SIGTERM, // kill
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syscall.SIGQUIT, // quit
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)
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// Wait for shutdown signal
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sig := <-sigChan
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log.Printf("Received signal: %v. Initiating graceful shutdown...", sig)
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// Perform graceful shutdown
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if err := a.Shutdown(); err != nil {
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log.Printf("Error during shutdown: %v", err)
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return err
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}
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log.Println("Application shutdown complete")
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return nil
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}
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// Shutdown performs graceful shutdown of all services
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func (a *App) Shutdown() error {
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a.shutdownMutex.Lock()
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defer a.shutdownMutex.Unlock()
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select {
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case <-a.shutdownDone:
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log.Println("Shutdown already in progress")
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return nil
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default:
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// Continue with shutdown
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}
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log.Println("Beginning graceful shutdown...")
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// Create context with timeout
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ctx, cancel := context.WithTimeout(context.Background(), a.shutdownTimeout)
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defer cancel()
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log.Println("Stopping HTTP Server...")
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if a.server != nil {
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if err := a.server.Shutdown(ctx); err != nil {
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log.Printf("Error stopping HTTP server: %v", err)
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}
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}
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close(a.shutdownDone)
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log.Println("Graceful shutdown completed successfully")
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return nil
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}
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// SetShutdownTimeout sets the maximum time to wait for graceful shutdown
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func (a *App) SetShutdownTimeout(timeout time.Duration) {
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a.shutdownTimeout = timeout
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}
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// ShutdownDone returns a channel that closes when shutdown is complete
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func (a *App) ShutdownDone() <-chan struct{} {
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return a.shutdownDone
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}
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