mirror of
https://github.com/minio/minio
synced 2024-10-14 11:52:56 +00:00
185 lines
5.3 KiB
Go
185 lines
5.3 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package http
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import (
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"context"
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"fmt"
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"net"
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"syscall"
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)
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type acceptResult struct {
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conn net.Conn
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err error
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lidx int
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}
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// httpListener - HTTP listener capable of handling multiple server addresses.
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type httpListener struct {
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tcpListeners []*net.TCPListener // underlaying TCP listeners.
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acceptCh chan acceptResult // channel where all TCP listeners write accepted connection.
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ctx context.Context
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ctxCanceler context.CancelFunc
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}
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// start - starts separate goroutine for each TCP listener. A valid new connection is passed to httpListener.acceptCh.
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func (listener *httpListener) start() {
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// Closure to send acceptResult to acceptCh.
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// It returns true if the result is sent else false if returns when doneCh is closed.
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send := func(result acceptResult) bool {
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select {
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case listener.acceptCh <- result:
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// Successfully written to acceptCh
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return true
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case <-listener.ctx.Done():
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return false
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}
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}
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// Closure to handle TCPListener until done channel is closed.
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handleListener := func(idx int, tcpListener *net.TCPListener) {
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for {
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tcpConn, err := tcpListener.AcceptTCP()
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if tcpConn != nil {
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tcpConn.SetKeepAlive(true)
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}
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send(acceptResult{tcpConn, err, idx})
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}
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}
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// Start separate goroutine for each TCP listener to handle connection.
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for idx, tcpListener := range listener.tcpListeners {
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go handleListener(idx, tcpListener)
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}
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}
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// Accept - reads from httpListener.acceptCh for one of previously accepted TCP connection and returns the same.
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func (listener *httpListener) Accept() (conn net.Conn, err error) {
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select {
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case result, ok := <-listener.acceptCh:
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if ok {
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return result.conn, result.err
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}
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case <-listener.ctx.Done():
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}
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return nil, syscall.EINVAL
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}
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// Close - closes underneath all TCP listeners.
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func (listener *httpListener) Close() (err error) {
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listener.ctxCanceler()
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for i := range listener.tcpListeners {
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listener.tcpListeners[i].Close()
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}
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return nil
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}
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// Addr - net.Listener interface compatible method returns net.Addr. In case of multiple TCP listeners, it returns '0.0.0.0' as IP address.
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func (listener *httpListener) Addr() (addr net.Addr) {
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addr = listener.tcpListeners[0].Addr()
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if len(listener.tcpListeners) == 1 {
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return addr
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}
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tcpAddr := addr.(*net.TCPAddr)
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if ip := net.ParseIP("0.0.0.0"); ip != nil {
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tcpAddr.IP = ip
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}
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addr = tcpAddr
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return addr
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}
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// Addrs - returns all address information of TCP listeners.
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func (listener *httpListener) Addrs() (addrs []net.Addr) {
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for i := range listener.tcpListeners {
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addrs = append(addrs, listener.tcpListeners[i].Addr())
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}
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return addrs
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}
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// TCPOptions specify customizable TCP optimizations on raw socket
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type TCPOptions struct {
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UserTimeout int // this value is expected to be in milliseconds
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Interface string // this is a VRF device passed via `--interface` flag
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Trace func(msg string) // Trace when starting.
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}
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// newHTTPListener - creates new httpListener object which is interface compatible to net.Listener.
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// httpListener is capable to
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// * listen to multiple addresses
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// * controls incoming connections only doing HTTP protocol
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func newHTTPListener(ctx context.Context, serverAddrs []string, opts TCPOptions) (listener *httpListener, listenErrs []error) {
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tcpListeners := make([]*net.TCPListener, 0, len(serverAddrs))
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listenErrs = make([]error, len(serverAddrs))
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// Unix listener with special TCP options.
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listenCfg := net.ListenConfig{
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Control: setTCPParametersFn(opts),
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}
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for i, serverAddr := range serverAddrs {
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var (
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l net.Listener
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e error
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)
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if l, e = listenCfg.Listen(ctx, "tcp", serverAddr); e != nil {
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if opts.Trace != nil {
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opts.Trace(fmt.Sprint("listenCfg.Listen: ", e.Error()))
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}
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listenErrs[i] = e
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continue
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}
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tcpListener, ok := l.(*net.TCPListener)
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if !ok {
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listenErrs[i] = fmt.Errorf("unexpected listener type found %v, expected net.TCPListener", l)
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if opts.Trace != nil {
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opts.Trace(fmt.Sprint("net.TCPListener: ", listenErrs[i].Error()))
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}
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continue
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}
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if opts.Trace != nil {
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opts.Trace(fmt.Sprint("adding listener to ", tcpListener.Addr()))
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}
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tcpListeners = append(tcpListeners, tcpListener)
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}
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if len(tcpListeners) == 0 {
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// No listeners initialized, no need to continue
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return
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}
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listener = &httpListener{
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tcpListeners: tcpListeners,
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acceptCh: make(chan acceptResult, len(tcpListeners)),
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}
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listener.ctx, listener.ctxCanceler = context.WithCancel(ctx)
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if opts.Trace != nil {
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opts.Trace(fmt.Sprint("opening ", len(listener.tcpListeners), " listeners"))
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}
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listener.start()
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return
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}
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