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server.go
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server.go
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package server
import (
"context"
"io"
"log"
"net/http"
"time"
)
// Server interface contains start method
type Server interface {
Start(context.Context)
}
type server struct {
h *http.Server
c []io.Closer
}
// Start the server and await done signal for graceful shutdown
func (s *server) Start(ctx context.Context) {
go func() {
if err := s.h.ListenAndServe(); err != nil && err != http.ErrServerClosed {
log.Fatalf("server encountered error while listening: %v\n", err)
}
}()
log.Println("Server started")
<-ctx.Done()
log.Println("Shutting down server")
// close outstanding server resources
for _, v := range s.c {
err := v.Close()
if err != nil {
log.Printf("Error closing server resource: %v", err)
}
}
// shutdown gracefully with timeout context
timeout, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
if err := s.h.Shutdown(timeout); err != nil {
log.Fatalf("Failed to shutdown correctly: %v\n", err)
}
}