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server.go
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server.go
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package http
import (
"context"
"crypto/tls"
"fmt"
"log"
"net"
"net/http"
"sync"
)
// MultiServer lets you create and run an HTTP server that serves over both, HTTP and HTTPS. It is a convenience wrapper around net/http and crypto/tls.
type MultiServer struct {
HTTPPort int
HTTPSPort int
CertFile string
KeyFile string
Logger *log.Logger
}
// Start creates listeners for HTTP and HTTPS and starts serving requests using the provided handler. The function blocks until both servers
// are properly shut down. A shutdown can be initiated by cancelling the given context.
func (srv MultiServer) Start(ctx context.Context, handler http.Handler) error {
var wg sync.WaitGroup
tlsListener, err := createTLSListener(srv.HTTPSPort, srv.CertFile, srv.KeyFile)
if err != nil {
return fmt.Errorf("failed to create TLS listener: %w", err)
}
wg.Add(1)
go func() {
defer wg.Done()
startServer(ctx, handler, tlsListener, srv.Logger)
}()
listener, err := net.Listen("tcp", fmt.Sprintf(":%d", srv.HTTPPort))
if err != nil {
return fmt.Errorf("failed to create TCP listener: %w", err)
}
wg.Add(1)
go func() {
defer wg.Done()
startServer(ctx, handler, listener, srv.Logger)
}()
wg.Wait()
return nil
}
func createTLSListener(port int, certFile, keyFile string) (net.Listener, error) {
cert, err := tls.LoadX509KeyPair(certFile, keyFile)
if err != nil {
return nil, fmt.Errorf("unable to load TLS key pair: %w", err)
}
listener, err := tls.Listen("tcp", fmt.Sprintf(":%d", port), &tls.Config{Certificates: []tls.Certificate{cert}})
if err != nil {
return nil, fmt.Errorf("unable to start TLS listener: %w", err)
}
return listener, nil
}
func startServer(ctx context.Context, hndlr http.Handler, listener net.Listener, logger *log.Logger) {
srv := http.Server{
Addr: listener.Addr().String(),
Handler: hndlr,
}
logger.Printf("https://" + srv.Addr)
go func() {
if err := srv.Serve(listener); err != http.ErrServerClosed {
logger.Fatalf("server quit unexpectedly: %s", err)
}
}()
<-ctx.Done()
logger.Printf("shutting down %s", listener.Addr())
if err := srv.Shutdown(ctx); err != nil && err != context.Canceled {
logger.Printf("error shutting down %s: %s", listener.Addr(), err)
}
}