5c949d3b3b
Package fdtrack logs statistics about open file descriptors. This should help identify the source of #1549.
113 lines
2.3 KiB
Go
113 lines
2.3 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser 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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// The go-ethereum library 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 Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package fdtrack logs statistics about open file descriptors.
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package fdtrack
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import (
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"fmt"
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"net"
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"sort"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/logger/glog"
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)
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var (
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mutex sync.Mutex
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all = make(map[string]int)
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)
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func Open(desc string) {
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mutex.Lock()
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all[desc] += 1
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mutex.Unlock()
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}
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func Close(desc string) {
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mutex.Lock()
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defer mutex.Unlock()
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if c, ok := all[desc]; ok {
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if c == 1 {
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delete(all, desc)
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} else {
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all[desc]--
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}
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}
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}
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func WrapListener(desc string, l net.Listener) net.Listener {
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Open(desc)
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return &wrappedListener{l, desc}
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}
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type wrappedListener struct {
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net.Listener
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desc string
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}
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func (w *wrappedListener) Accept() (net.Conn, error) {
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c, err := w.Listener.Accept()
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if err == nil {
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c = WrapConn(w.desc, c)
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}
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return c, err
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}
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func (w *wrappedListener) Close() error {
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err := w.Listener.Close()
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if err == nil {
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Close(w.desc)
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}
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return err
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}
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func WrapConn(desc string, conn net.Conn) net.Conn {
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Open(desc)
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return &wrappedConn{conn, desc}
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}
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type wrappedConn struct {
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net.Conn
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desc string
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}
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func (w *wrappedConn) Close() error {
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err := w.Conn.Close()
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if err == nil {
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Close(w.desc)
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}
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return err
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}
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func Start() {
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go func() {
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for range time.Tick(15 * time.Second) {
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mutex.Lock()
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var sum, tracked = 0, []string{}
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for what, n := range all {
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sum += n
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tracked = append(tracked, fmt.Sprintf("%s:%d", what, n))
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}
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mutex.Unlock()
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used, _ := fdusage()
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sort.Strings(tracked)
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glog.Infof("fd usage %d/%d, tracked %d %v", used, fdlimit(), sum, tracked)
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}
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}()
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}
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