70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
/*
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* Minio Cloud Storage, (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package minhttp
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import (
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"net"
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"os"
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"sync"
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)
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// rateLimitedListener returns a Listener that accepts at most n simultaneous
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// connections from the provided Listener.
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func rateLimitedListener(l net.Listener, nconn int) net.Listener {
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if nconn > 0 {
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return &rateLimitListener{l, make(chan struct{}, nconn)}
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}
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return l
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}
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type rateLimitListener struct {
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net.Listener
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sem chan struct{}
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}
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func (l *rateLimitListener) accept() { l.sem <- struct{}{} }
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func (l *rateLimitListener) release() { <-l.sem }
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// File - necessary to expose underlying socket fd
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func (l *rateLimitListener) File() (f *os.File, err error) {
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return l.Listener.(fileListener).File()
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}
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// Accept - accept method for accepting new connections
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func (l *rateLimitListener) Accept() (net.Conn, error) {
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l.accept()
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c, err := l.Listener.Accept()
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if err != nil {
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l.release()
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return nil, err
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}
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return &rateLimitListenerConn{Conn: c, release: l.release}, nil
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}
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type rateLimitListenerConn struct {
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net.Conn
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releaseOnce sync.Once
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release func()
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}
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func (l *rateLimitListenerConn) Close() error {
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err := l.Conn.Close()
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l.releaseOnce.Do(l.release)
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return err
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}
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