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server.go
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server.go
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package health
import (
"context"
"net/http"
"time"
)
type Server struct {
address string
logger Logger
handler http.Handler
}
func NewServer(address string, logger Logger, healthcheck func() error) *Server {
handler := newHandler(healthcheck)
return &Server{
address: address,
logger: logger,
handler: handler,
}
}
func (s *Server) Run(ctx context.Context, done chan<- struct{}) {
defer close(done)
server := http.Server{
Addr: s.address,
Handler: s.handler,
ReadHeaderTimeout: time.Second,
ReadTimeout: time.Second,
}
go func() {
<-ctx.Done()
s.logger.Warn("shutting down (context canceled)")
defer s.logger.Warn("shut down")
const shutdownGraceDuration = 2 * time.Second
shutdownCtx, cancel := context.WithTimeout(context.Background(), shutdownGraceDuration)
defer cancel()
err := server.Shutdown(shutdownCtx)
if err != nil {
s.logger.Error("failed shutting down: " + err.Error())
}
}()
for ctx.Err() == nil {
s.logger.Info("listening on " + s.address)
err := server.ListenAndServe()
if err != nil && ctx.Err() == nil { // server crashed
s.logger.Error(err.Error())
s.logger.Info("restarting")
}
}
}