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server_adapter.go
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server_adapter.go
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package mrserver
import (
"context"
"fmt"
"net"
"net/http"
"path/filepath"
"time"
"github.com/mondegor/go-webcore/mrlog"
)
const (
ListenTypeSock = "sock"
ListenTypePort = "port"
)
type (
ServerAdapter struct {
caption string
server *http.Server
shutdownTimeout time.Duration
listenOpts ListenOptions
}
ServerOptions struct {
Caption string
Handler http.Handler
ReadTimeout time.Duration
WriteTimeout time.Duration
ShutdownTimeout time.Duration
Listen ListenOptions
}
ListenOptions struct {
AppPath string
Type string
SockName string
BindIP string
Port string
}
)
func NewServerAdapter(ctx context.Context, opts ServerOptions) *ServerAdapter {
httpServer := &http.Server{
Handler: opts.Handler,
// IdleTimeout: 120 * time.Second,
// MaxHeaderBytes: 16 * 1024,
// ReadHeaderTimeout: 10 * time.Second,
ReadTimeout: opts.ReadTimeout,
WriteTimeout: opts.WriteTimeout,
BaseContext: func(l net.Listener) context.Context {
return ctx
},
}
if opts.Caption == "" {
opts.Caption = "MainHttpServer"
}
return &ServerAdapter{
caption: opts.Caption,
server: httpServer,
shutdownTimeout: opts.ShutdownTimeout,
listenOpts: opts.Listen,
}
}
func (s *ServerAdapter) PrepareToStart(ctx context.Context) (execute func() error, interrupt func(error)) {
return func() error {
return s.Start(ctx)
}, func(err error) {
if err := s.Shutdown(ctx); err != nil {
mrlog.Ctx(ctx).Error().Err(err).Send()
}
}
}
// Start - exec server Serve()
func (s *ServerAdapter) Start(ctx context.Context) error {
logger := mrlog.Ctx(ctx).With().Str("server", s.caption).Logger()
logger.Info().Msg("Starting the server...")
listener, err := s.createListener(logger)
if err != nil {
return fmt.Errorf("failed start listening: %w", err)
}
if err = s.server.Serve(listener); err != nil {
return err
}
logger.Info().Msg("Stop the server listening")
return nil
}
func (s *ServerAdapter) Shutdown(ctx context.Context) error {
logger := mrlog.Ctx(ctx).With().Str("server", s.caption).Logger()
logger.Info().Msg("Shutting down the server...")
ctx, cancel := context.WithTimeout(ctx, s.shutdownTimeout)
defer cancel()
if err := s.server.Shutdown(ctx); err != nil {
return err
}
logger.Info().Msg("The server has been shutdown")
return nil
}
func (s *ServerAdapter) createListener(logger mrlog.Logger) (net.Listener, error) {
if s.listenOpts.Type == ListenTypeSock {
logger.Debug().Msg("Detect app real path")
appDir, err := filepath.Abs(filepath.Dir(s.listenOpts.AppPath))
if err != nil {
return nil, fmt.Errorf("app real path: %w", err)
}
socketPath := filepath.Join(appDir, s.listenOpts.SockName)
logger.Debug().Msgf("Listen to unix socket: %s", socketPath)
listener, err := net.Listen("unix", socketPath)
if err == nil {
logger.Info().Msgf("The server is listening unix socket: %s", socketPath)
}
return listener, err
} else if s.listenOpts.Type == ListenTypePort {
addr := fmt.Sprintf("%s:%s", s.listenOpts.BindIP, s.listenOpts.Port)
logger.Debug().Msgf("Listen to tcp: %s", addr)
listener, err := net.Listen("tcp", addr)
if err == nil {
logger.Info().Msgf("The server is listening to port %s", addr)
}
return listener, err
}
availableValues := fmt.Sprintf("Available values: %s, %s", ListenTypePort, ListenTypeSock)
if s.listenOpts.Type == "" {
return nil, fmt.Errorf("listen type is required. %s", availableValues)
}
return nil, fmt.Errorf("listen type '%s' is unknown. %s", s.listenOpts.Type, availableValues)
}