mirror of
https://codeberg.org/forgejo/forgejo.git
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211 lines
5.6 KiB
Go
211 lines
5.6 KiB
Go
// +build !windows
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// Copyright 2019 The Gitea Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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// This code is heavily inspired by the archived gofacebook/gracenet/net.go handler
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package graceful
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import (
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"fmt"
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"net"
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"os"
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"strconv"
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"strings"
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"sync"
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"code.gitea.io/gitea/modules/log"
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)
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const (
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listenFDs = "LISTEN_FDS"
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startFD = 3
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)
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// In order to keep the working directory the same as when we started we record
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// it at startup.
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var originalWD, _ = os.Getwd()
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var (
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once = sync.Once{}
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mutex = sync.Mutex{}
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providedListeners = []net.Listener{}
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activeListeners = []net.Listener{}
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)
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func getProvidedFDs() (savedErr error) {
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// Only inherit the provided FDS once but we will save the error so that repeated calls to this function will return the same error
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once.Do(func() {
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mutex.Lock()
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defer mutex.Unlock()
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numFDs := os.Getenv(listenFDs)
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if numFDs == "" {
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return
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}
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n, err := strconv.Atoi(numFDs)
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if err != nil {
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savedErr = fmt.Errorf("%s is not a number: %s. Err: %v", listenFDs, numFDs, err)
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return
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}
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for i := startFD; i < n+startFD; i++ {
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file := os.NewFile(uintptr(i), fmt.Sprintf("listener_FD%d", i))
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l, err := net.FileListener(file)
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if err == nil {
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// Close the inherited file if it's a listener
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if err = file.Close(); err != nil {
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savedErr = fmt.Errorf("error closing provided socket fd %d: %s", i, err)
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return
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}
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providedListeners = append(providedListeners, l)
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continue
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}
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// If needed we can handle packetconns here.
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savedErr = fmt.Errorf("Error getting provided socket fd %d: %v", i, err)
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return
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}
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})
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return savedErr
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}
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// CloseProvidedListeners closes all unused provided listeners.
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func CloseProvidedListeners() error {
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mutex.Lock()
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defer mutex.Unlock()
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var returnableError error
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for _, l := range providedListeners {
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err := l.Close()
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if err != nil {
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log.Error("Error in closing unused provided listener: %v", err)
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if returnableError != nil {
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returnableError = fmt.Errorf("%v & %v", returnableError, err)
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} else {
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returnableError = err
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}
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}
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}
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providedListeners = []net.Listener{}
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return returnableError
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}
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// GetListener obtains a listener for the local network address. The network must be
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// a stream-oriented network: "tcp", "tcp4", "tcp6", "unix" or "unixpacket". It
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// returns an provided net.Listener for the matching network and address, or
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// creates a new one using net.Listen.
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func GetListener(network, address string) (net.Listener, error) {
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// Add a deferral to say that we've tried to grab a listener
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defer InformCleanup()
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switch network {
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case "tcp", "tcp4", "tcp6":
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tcpAddr, err := net.ResolveTCPAddr(network, address)
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if err != nil {
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return nil, err
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}
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return GetListenerTCP(network, tcpAddr)
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case "unix", "unixpacket":
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unixAddr, err := net.ResolveUnixAddr(network, address)
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if err != nil {
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return nil, err
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}
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return GetListenerUnix(network, unixAddr)
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default:
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return nil, net.UnknownNetworkError(network)
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}
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}
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// GetListenerTCP announces on the local network address. The network must be:
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// "tcp", "tcp4" or "tcp6". It returns a provided net.Listener for the
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// matching network and address, or creates a new one using net.ListenTCP.
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func GetListenerTCP(network string, address *net.TCPAddr) (*net.TCPListener, error) {
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if err := getProvidedFDs(); err != nil {
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return nil, err
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}
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mutex.Lock()
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defer mutex.Unlock()
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// look for a provided listener
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for i, l := range providedListeners {
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if isSameAddr(l.Addr(), address) {
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providedListeners = append(providedListeners[:i], providedListeners[i+1:]...)
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activeListeners = append(activeListeners, l)
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return l.(*net.TCPListener), nil
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}
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}
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// no provided listener for this address -> make a fresh listener
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l, err := net.ListenTCP(network, address)
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if err != nil {
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return nil, err
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}
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activeListeners = append(activeListeners, l)
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return l, nil
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}
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// GetListenerUnix announces on the local network address. The network must be:
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// "unix" or "unixpacket". It returns a provided net.Listener for the
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// matching network and address, or creates a new one using net.ListenUnix.
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func GetListenerUnix(network string, address *net.UnixAddr) (*net.UnixListener, error) {
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if err := getProvidedFDs(); err != nil {
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return nil, err
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}
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mutex.Lock()
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defer mutex.Unlock()
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// look for a provided listener
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for i, l := range providedListeners {
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if isSameAddr(l.Addr(), address) {
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providedListeners = append(providedListeners[:i], providedListeners[i+1:]...)
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activeListeners = append(activeListeners, l)
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return l.(*net.UnixListener), nil
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}
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}
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// make a fresh listener
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l, err := net.ListenUnix(network, address)
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if err != nil {
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return nil, err
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}
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activeListeners = append(activeListeners, l)
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return l, nil
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}
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func isSameAddr(a1, a2 net.Addr) bool {
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// If the addresses are not on the same network fail.
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if a1.Network() != a2.Network() {
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return false
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}
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// If the two addresses have the same string representation they're equal
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a1s := a1.String()
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a2s := a2.String()
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if a1s == a2s {
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return true
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}
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// This allows for ipv6 vs ipv4 local addresses to compare as equal. This
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// scenario is common when listening on localhost.
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const ipv6prefix = "[::]"
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a1s = strings.TrimPrefix(a1s, ipv6prefix)
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a2s = strings.TrimPrefix(a2s, ipv6prefix)
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const ipv4prefix = "0.0.0.0"
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a1s = strings.TrimPrefix(a1s, ipv4prefix)
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a2s = strings.TrimPrefix(a2s, ipv4prefix)
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return a1s == a2s
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}
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func getActiveListeners() []net.Listener {
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mutex.Lock()
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defer mutex.Unlock()
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listeners := make([]net.Listener, len(activeListeners))
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copy(listeners, activeListeners)
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return listeners
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}
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