64 lines
1.3 KiB
Go
64 lines
1.3 KiB
Go
package healthcheck
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"net"
|
|
"net/http"
|
|
"time"
|
|
|
|
"github.com/qdm12/golibs/logging"
|
|
)
|
|
|
|
type Server interface {
|
|
Run(ctx context.Context, healthy chan<- bool, done chan<- struct{})
|
|
}
|
|
|
|
type server struct {
|
|
address string
|
|
logger logging.Logger
|
|
handler *handler
|
|
resolver *net.Resolver
|
|
}
|
|
|
|
func NewServer(address string, logger logging.Logger) Server {
|
|
return &server{
|
|
address: address,
|
|
logger: logger,
|
|
handler: newHandler(logger),
|
|
resolver: net.DefaultResolver,
|
|
}
|
|
}
|
|
|
|
func (s *server) Run(ctx context.Context, healthy chan<- bool, done chan<- struct{}) {
|
|
defer close(done)
|
|
|
|
loopDone := make(chan struct{})
|
|
go s.runHealthcheckLoop(ctx, healthy, loopDone)
|
|
|
|
server := http.Server{
|
|
Addr: s.address,
|
|
Handler: s.handler,
|
|
}
|
|
serverDone := make(chan struct{})
|
|
go func() {
|
|
defer close(serverDone)
|
|
<-ctx.Done()
|
|
const shutdownGraceDuration = 2 * time.Second
|
|
shutdownCtx, cancel := context.WithTimeout(context.Background(), shutdownGraceDuration)
|
|
defer cancel()
|
|
if err := server.Shutdown(shutdownCtx); err != nil {
|
|
s.logger.Error("failed shutting down: %s", err)
|
|
}
|
|
}()
|
|
|
|
s.logger.Info("listening on %s", s.address)
|
|
err := server.ListenAndServe()
|
|
if err != nil && !errors.Is(ctx.Err(), context.Canceled) {
|
|
s.logger.Error(err)
|
|
}
|
|
|
|
<-loopDone
|
|
<-serverDone
|
|
}
|