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httpserver.go
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package httpserver
import (
"context"
"errors"
"fmt"
"net"
"net/http"
"time"
"golang.org/x/sync/errgroup"
"github.com/circleci/ex/o11y"
)
type HTTPServer struct {
listener *trackedListener
server *http.Server
grace time.Duration
}
type Config struct {
// Name is the name of the server in o11y
Name string
// Addr is the address to listen on
Addr string
// Handler is the HTTP handler to delegate requests to.
Handler http.Handler
// Optional
// Network must be "tcp", "tcp4", "tcp6", "unix", "unixpacket" or "" (which defaults to tcp).
Network string
// ShutdownGrace is the period during which the server allows requests to be fully served.
ShutdownGrace time.Duration
}
func New(ctx context.Context, cfg Config) (s *HTTPServer, err error) {
ctx, span := o11y.StartSpan(ctx, "server: new-server "+cfg.Name)
defer o11y.End(span, &err)
if cfg.Network == "" {
cfg.Network = "tcp"
}
span.AddField("server_name", cfg.Name)
span.AddField("address", cfg.Addr)
span.AddField("network", cfg.Network)
ln, err := net.Listen(cfg.Network, cfg.Addr)
if err != nil {
return nil, err
}
tr := &trackedListener{
Listener: ln,
name: cfg.Name,
}
ln = tr
span.AddField("address", ln.Addr().String())
grace := cfg.ShutdownGrace
if grace == 0 {
grace = 10 * time.Second
}
span.AddField("shutdown_grace", grace)
return &HTTPServer{
listener: tr,
server: &http.Server{
Addr: cfg.Addr,
Handler: cfg.Handler,
ReadTimeout: 55 * time.Second,
WriteTimeout: 55 * time.Second,
},
grace: grace,
}, nil
}
// Serve the http server. On context cancellation the server is shutdown giving some time
// for the in flight requests to be handled.
func (s *HTTPServer) Serve(ctx context.Context) error {
g, ctx := errgroup.WithContext(ctx)
g.Go(func() error {
<-ctx.Done()
cctx, cancel := context.WithTimeout(context.Background(), s.grace)
defer cancel()
if err := s.server.Shutdown(cctx); err != nil {
return fmt.Errorf("server shutdown failed: %w", err)
}
return nil
})
g.Go(func() error {
err := s.server.Serve(s.listener)
if !errors.Is(err, http.ErrServerClosed) {
return err
}
return nil
})
return g.Wait()
}
func (s *HTTPServer) MetricsProducer() MetricProducer {
return s.listener
}
func (s HTTPServer) Addr() string {
return s.listener.Addr().String()
}