137 lines
2.5 KiB
Go
137 lines
2.5 KiB
Go
package server
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import (
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"fmt"
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"io"
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"net"
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"sync"
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"sync/atomic"
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"time"
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"git.loafle.net/commons_go/logging"
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)
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type Server interface {
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Start() error
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Stop()
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Serve() error
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}
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func NewServer(sh ServerHandler) Server {
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s := &server{
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serverHandler: sh,
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}
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return s
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}
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type server struct {
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serverHandler ServerHandler
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listener net.Listener
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Stats ConnStats
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stopChan chan struct{}
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stopWg sync.WaitGroup
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}
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func (s *server) Start() error {
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if nil == s.serverHandler {
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panic("Server: server handler must be specified.")
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}
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s.serverHandler.Validate()
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if s.stopChan != nil {
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panic("Server: server is already running. Stop it before starting it again")
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}
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s.stopChan = make(chan struct{})
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var err error
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if s.listener, err = s.serverHandler.Listen(); nil != err {
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return err
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}
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s.stopWg.Add(1)
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go runServer(s)
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return nil
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}
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func (s *server) Stop() {
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if s.stopChan == nil {
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panic("Server: server must be started before stopping it")
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}
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close(s.stopChan)
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s.stopWg.Wait()
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s.stopChan = nil
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s.serverHandler.OnStopped()
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}
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func (s *server) Serve() error {
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if err := s.Start(); err != nil {
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return err
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}
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s.stopWg.Wait()
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return nil
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}
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func runServer(s *server) {
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defer s.stopWg.Done()
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var conn io.ReadWriteCloser
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var clientAddr string
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var err error
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var stopping atomic.Value
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for {
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acceptChan := make(chan struct{})
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go func() {
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if conn, clientAddr, err = s.serverHandler.accept(s.listener); err != nil {
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if stopping.Load() == nil {
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logging.Logger.Error(fmt.Sprintf("Server: [%s]. Cannot accept new connection: [%s]", s.serverHandler.GetAddr(), err))
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}
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}
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close(acceptChan)
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}()
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select {
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case <-s.stopChan:
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stopping.Store(true)
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s.listener.Close()
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<-acceptChan
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return
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case <-acceptChan:
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s.Stats.incAcceptCalls()
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}
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if err != nil {
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s.Stats.incAcceptErrors()
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select {
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case <-s.stopChan:
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return
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case <-time.After(time.Second):
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}
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continue
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}
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s.stopWg.Add(1)
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go handleServerConnection(s, conn, clientAddr)
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}
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}
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func handleServerConnection(s *server, conn io.ReadWriteCloser, clientAddr string) {
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defer s.stopWg.Done()
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logging.Logger.Debug(fmt.Sprintf("Server: Client[%s] is connected.", clientAddr))
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clientStopChan := make(chan struct{})
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go s.serverHandler.Handle(clientAddr, conn, clientStopChan)
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select {
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case <-s.stopChan:
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close(clientStopChan)
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conn.Close()
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return
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case <-clientStopChan:
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conn.Close()
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logging.Logger.Debug(fmt.Sprintf("Server: Client[%s] is disconnected.", clientAddr))
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return
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}
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}
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