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80 lines (64 loc) · 2.03 KB
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package httpserver
import (
"context"
"net"
"net/http"
"os"
"sync"
"time"
"github.com/inconshreveable/log15"
"github.com/sourcegraph/sourcegraph/internal/goroutine"
)
type server struct {
server *http.Server
makeListener func() (net.Listener, error)
once sync.Once
preShutdownPause time.Duration
}
type ServerOptions func(s *server)
func WithPreShutdownPause(d time.Duration) ServerOptions {
return func(s *server) { s.preShutdownPause = d }
}
// New returns a BackgroundRoutine that serves the given server on the given listener.
func New(listener net.Listener, httpServer *http.Server, options ...ServerOptions) goroutine.BackgroundRoutine {
makeListener := func() (net.Listener, error) { return listener, nil }
return newServer(httpServer, makeListener, options...)
}
// NewFromAddr returns a BackgroundRoutine that serves the given handler on the given address.
func NewFromAddr(addr string, httpServer *http.Server, options ...ServerOptions) goroutine.BackgroundRoutine {
makeListener := func() (net.Listener, error) { return NewListener(addr) }
return newServer(httpServer, makeListener, options...)
}
func newServer(httpServer *http.Server, makeListener func() (net.Listener, error), options ...ServerOptions) goroutine.BackgroundRoutine {
s := &server{
server: httpServer,
makeListener: makeListener,
}
for _, option := range options {
option(s)
}
return s
}
func (s *server) Start() {
listener, err := s.makeListener()
if err != nil {
log15.Error("Failed to create listener", "error", err)
os.Exit(1)
}
if err := s.server.Serve(listener); err != http.ErrServerClosed {
log15.Error("Failed to start server", "error", err)
os.Exit(1)
}
}
func (s *server) Stop() {
s.once.Do(func() {
if s.preShutdownPause > 0 {
time.Sleep(s.preShutdownPause)
}
ctx, cancel := context.WithTimeout(context.Background(), goroutine.GracefulShutdownTimeout)
defer cancel()
if err := s.server.Shutdown(ctx); err != nil {
log15.Error("Failed to shutdown server", "error", err)
}
})
}