68 lines
1.4 KiB
Go
68 lines
1.4 KiB
Go
package healthcheck
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import (
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"context"
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"errors"
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"net"
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"net/http"
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"sync"
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"time"
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"github.com/qdm12/golibs/logging"
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)
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type Server interface {
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Run(ctx context.Context, wg *sync.WaitGroup)
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}
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type server struct {
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address string
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logger logging.Logger
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handler *handler
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resolver *net.Resolver
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}
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func NewServer(address string, logger logging.Logger) Server {
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healthcheckLogger := logger.WithPrefix("healthcheck: ")
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return &server{
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address: address,
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logger: healthcheckLogger,
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handler: newHandler(healthcheckLogger),
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resolver: net.DefaultResolver,
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}
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}
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func (s *server) Run(ctx context.Context, wg *sync.WaitGroup) {
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defer wg.Done()
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internalWg := &sync.WaitGroup{}
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internalWg.Add(1)
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go s.runHealthcheckLoop(ctx, internalWg)
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server := http.Server{
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Addr: s.address,
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Handler: s.handler,
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}
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internalWg.Add(1)
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go func() {
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defer internalWg.Done()
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<-ctx.Done()
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s.logger.Warn("context canceled: shutting down server")
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defer s.logger.Warn("server shut down")
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const shutdownGraceDuration = 2 * time.Second
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shutdownCtx, cancel := context.WithTimeout(context.Background(), shutdownGraceDuration)
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defer cancel()
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if err := server.Shutdown(shutdownCtx); err != nil {
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s.logger.Error("failed shutting down: %s", err)
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}
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}()
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s.logger.Info("listening on %s", s.address)
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err := server.ListenAndServe()
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if err != nil && !errors.Is(ctx.Err(), context.Canceled) {
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s.logger.Error(err)
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}
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internalWg.Wait()
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}
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