mirror of https://github.com/subgraph/fw-daemon
parent
7c702b5768
commit
c2636d8f97
@ -1,139 +0,0 @@
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package main
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import (
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"fmt"
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"net"
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"sync"
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"time"
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)
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// MortalService can be killed at any time.
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type MortalService struct {
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network string
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address string
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connectionCallback func(net.Conn) error
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conns []net.Conn
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quit chan bool
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listener net.Listener
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waitGroup *sync.WaitGroup
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}
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// NewMortalService creates a new MortalService
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func NewMortalService(network, address string, connectionCallback func(net.Conn) error) *MortalService {
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l := MortalService{
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network: network,
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address: address,
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connectionCallback: connectionCallback,
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conns: make([]net.Conn, 0, 10),
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quit: make(chan bool),
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waitGroup: &sync.WaitGroup{},
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}
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return &l
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}
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// Stop will kill our listener and all it's connections
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func (l *MortalService) Stop() {
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log.Info("stopping listener service %s:%s", l.network, l.address)
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close(l.quit)
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if l.listener != nil {
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l.listener.Close()
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}
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l.waitGroup.Wait()
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}
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func (l *MortalService) acceptLoop() {
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defer l.waitGroup.Done()
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defer func() {
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log.Info("stoping listener service %s:%s", l.network, l.address)
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for i, conn := range l.conns {
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if conn != nil {
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log.Info("Closing connection #%d", i)
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conn.Close()
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}
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}
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}()
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defer l.listener.Close()
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for {
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conn, err := l.listener.Accept()
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if nil != err {
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if opErr, ok := err.(*net.OpError); ok && opErr.Timeout() {
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continue
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} else {
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log.Info("MortalService connection accept failure: %s\n", err)
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select {
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case <-l.quit:
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return
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default:
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}
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continue
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}
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}
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l.conns = append(l.conns, conn)
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go l.handleConnection(conn, len(l.conns)-1)
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}
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}
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func (l *MortalService) createDeadlinedListener() error {
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if l.network == "tcp" {
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tcpAddr, err := net.ResolveTCPAddr("tcp", l.address)
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if err != nil {
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return fmt.Errorf("MortalService.createDeadlinedListener %s %s failure: %s", l.network, l.address, err)
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}
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tcpListener, err := net.ListenTCP("tcp", tcpAddr)
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if err != nil {
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return fmt.Errorf("MortalService.createDeadlinedListener %s %s failure: %s", l.network, l.address, err)
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}
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tcpListener.SetDeadline(time.Now().Add(1e9))
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l.listener = tcpListener
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return nil
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} else if l.network == "unix" {
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unixAddr, err := net.ResolveUnixAddr("unix", l.address)
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if err != nil {
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return fmt.Errorf("MortalService.createDeadlinedListener %s %s failure: %s", l.network, l.address, err)
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}
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unixListener, err := net.ListenUnix("unix", unixAddr)
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if err != nil {
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return fmt.Errorf("MortalService.createDeadlinedListener %s %s failure: %s", l.network, l.address, err)
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}
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unixListener.SetDeadline(time.Now().Add(1e9))
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l.listener = unixListener
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return nil
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} else {
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panic("")
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}
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return nil
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}
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// Start the MortalService
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func (l *MortalService) Start() error {
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var err error
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err = l.createDeadlinedListener()
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if err != nil {
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return err
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}
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l.waitGroup.Add(1)
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go l.acceptLoop()
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return nil
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}
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func (l *MortalService) handleConnection(conn net.Conn, id int) error {
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defer func() {
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log.Info("Closing connection #%d", id)
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conn.Close()
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l.conns[id] = nil
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}()
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log.Info("Starting connection #%d", id)
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for {
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if err := l.connectionCallback(conn); err != nil {
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log.Error(err.Error())
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return err
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}
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return nil
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}
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}
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