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Merge pull request #15000 from fjl/node-flock 

node: fix instance dir locking and improve error message
This commit is contained in:
Péter Szilágyi 2017-08-23 13:36:11 +03:00 committed by GitHub
parent 79cdbcfe64 7e57fee355
commit f7e39a7724
10 changed files with 551 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
node/errors.go
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@ -17,10 +17,28 @@
package node
import (
"errors"
"fmt"
"reflect"
"syscall"
)
var (
ErrDatadirUsed = errors.New("datadir already used by another process")
ErrNodeStopped = errors.New("node not started")
ErrNodeRunning = errors.New("node already running")
ErrServiceUnknown = errors.New("unknown service")
datadirInUseErrnos = map[uint]bool{11: true, 32: true, 35: true}
)
func convertFileLockError(err error) error {
if errno, ok := err.(syscall.Errno); ok && datadirInUseErrnos[uint(errno)] {
return ErrDatadirUsed
}
return err
}
// DuplicateServiceError is returned during Node startup if a registered service
// constructor returns a service of the same type that was already started.
type DuplicateServiceError struct {

36
node/node.go
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@ -25,7 +25,6 @@ import (
"reflect"
"strings"
"sync"
"syscall"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/ethdb"
@ -34,16 +33,7 @@ import (
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/rpc"
"github.com/syndtr/goleveldb/leveldb/storage"
)
var (
ErrDatadirUsed = errors.New("datadir already used")
ErrNodeStopped = errors.New("node not started")
ErrNodeRunning = errors.New("node already running")
ErrServiceUnknown = errors.New("unknown service")
datadirInUseErrnos = map[uint]bool{11: true, 32: true, 35: true}
"github.com/prometheus/prometheus/util/flock"
)
// Node is a container on which services can be registered.
@ -52,8 +42,8 @@ type Node struct {
config *Config
accman *accounts.Manager
ephemeralKeystore string // if non-empty, the key directory that will be removed by Stop
instanceDirLock storage.Storage // prevents concurrent use of instance directory
ephemeralKeystore string // if non-empty, the key directory that will be removed by Stop
instanceDirLock flock.Releaser // prevents concurrent use of instance directory
serverConfig p2p.Config
server *p2p.Server // Currently running P2P networking layer
@ -197,10 +187,7 @@ func (n *Node) Start() error {
running.Protocols = append(running.Protocols, service.Protocols()...)
}
if err := running.Start(); err != nil {
if errno, ok := err.(syscall.Errno); ok && datadirInUseErrnos[uint(errno)] {
return ErrDatadirUsed
}
return err
return convertFileLockError(err)
}
// Start each of the services
started := []reflect.Type{}
@ -242,14 +229,13 @@ func (n *Node) openDataDir() error {
if err := os.MkdirAll(instdir, 0700); err != nil {
return err
}
// Try to open the instance directory as LevelDB storage. This creates a lock file
// which prevents concurrent use by another instance as well as accidental use of the
// instance directory as a database.
storage, err := storage.OpenFile(instdir, true)
// Lock the instance directory to prevent concurrent use by another instance as well as
// accidental use of the instance directory as a database.
release, _, err := flock.New(filepath.Join(instdir, "LOCK"))
if err != nil {
return err
return convertFileLockError(err)
}
n.instanceDirLock = storage
n.instanceDirLock = release
return nil
}
@ -509,7 +495,9 @@ func (n *Node) Stop() error {
// Release instance directory lock.
if n.instanceDirLock != nil {
n.instanceDirLock.Close()
if err := n.instanceDirLock.Release(); err != nil {
log.Error("Can't release datadir lock", "err", err)
}
n.instanceDirLock = nil
}

201
vendor/github.com/prometheus/prometheus/LICENSE generated vendored Normal file
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@ -0,0 +1,201 @@
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87
vendor/github.com/prometheus/prometheus/NOTICE generated vendored Normal file
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@ -0,0 +1,87 @@
The Prometheus systems and service monitoring server
Copyright 2012-2015 The Prometheus Authors
This product includes software developed at
SoundCloud Ltd. (http://soundcloud.com/).
The following components are included in this product:
Bootstrap
http://getbootstrap.com
Copyright 2011-2014 Twitter, Inc.
Licensed under the MIT License
bootstrap3-typeahead.js
https://github.com/bassjobsen/Bootstrap-3-Typeahead
Original written by @mdo and @fat
Copyright 2014 Bass Jobsen @bassjobsen
Licensed under the Apache License, Version 2.0
fuzzy
https://github.com/mattyork/fuzzy
Original written by @mattyork
Copyright 2012 Matt York
Licensed under the MIT License
bootstrap-datetimepicker.js
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Copyright 2015 Jonathan Peterson (@Eonasdan)
Licensed under the MIT License
moment.js
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Copyright JS Foundation and other contributors
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Copyright 2011-2014 by Shutterstock Images, LLC
See https://github.com/shutterstock/rickshaw/blob/master/LICENSE for license details
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Copyright 2010-2015 The mustache.js community
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Copyright jQuery Foundation and other contributors
Licensed under the MIT License
Go support for Protocol Buffers - Google's data interchange format
http://github.com/golang/protobuf/
Copyright 2010 The Go Authors
See source code for license details.
Go support for leveled logs, analogous to
https://code.google.com/p/google-glog/
Copyright 2013 Google Inc.
Licensed under the Apache License, Version 2.0
Support for streaming Protocol Buffer messages for the Go language (golang).
https://github.com/matttproud/golang_protobuf_extensions
Copyright 2013 Matt T. Proud
Licensed under the Apache License, Version 2.0
DNS library in Go
http://miek.nl/posts/2014/Aug/16/go-dns-package/
Copyright 2009 The Go Authors, 2011 Miek Gieben
See https://github.com/miekg/dns/blob/master/LICENSE for license details.
LevelDB key/value database in Go
https://github.com/syndtr/goleveldb
Copyright 2012 Suryandaru Triandana
See https://github.com/syndtr/goleveldb/blob/master/LICENSE for license details.
gosnappy - a fork of code.google.com/p/snappy-go
https://github.com/syndtr/gosnappy
Copyright 2011 The Snappy-Go Authors
See https://github.com/syndtr/gosnappy/blob/master/LICENSE for license details.
go-zookeeper - Native ZooKeeper client for Go
https://github.com/samuel/go-zookeeper
Copyright (c) 2013, Samuel Stauffer <samuel@descolada.com>
See https://github.com/samuel/go-zookeeper/blob/master/LICENSE for license details.

46
vendor/github.com/prometheus/prometheus/util/flock/flock.go generated vendored Normal file
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@ -0,0 +1,46 @@
// Copyright 2016 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package flock provides portable file locking. It is essentially ripped out
// from the code of github.com/syndtr/goleveldb. Strange enough that the
// standard library does not provide this functionality. Once this package has
// proven to work as expected, we should probably turn it into a separate
// general purpose package for humanity.
package flock
import (
"os"
"path/filepath"
)
// Releaser provides the Release method to release a file lock.
type Releaser interface {
Release() error
}
// New locks the file with the provided name. If the file does not exist, it is
// created. The returned Releaser is used to release the lock. existed is true
// if the file to lock already existed. A non-nil error is returned if the
// locking has failed. Neither this function nor the returned Releaser is
// goroutine-safe.
func New(fileName string) (r Releaser, existed bool, err error) {
if err = os.MkdirAll(filepath.Dir(fileName), 0755); err != nil {
return
}
_, err = os.Stat(fileName)
existed = err == nil
r, err = newLock(fileName)
return
}

32
vendor/github.com/prometheus/prometheus/util/flock/flock_plan9.go generated vendored Normal file
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@ -0,0 +1,32 @@
// Copyright 2016 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package flock
import "os"
type plan9Lock struct {
f *os.File
}
func (l *plan9Lock) Release() error {
return l.f.Close()
}
func newLock(fileName string) (Releaser, error) {
f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, os.ModeExclusive|0644)
if err != nil {
return nil, err
}
return &plan9Lock{f}, nil
}

59
vendor/github.com/prometheus/prometheus/util/flock/flock_solaris.go generated vendored Normal file
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@ -0,0 +1,59 @@
// Copyright 2016 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build solaris
package flock
import (
"os"
"syscall"
)
type unixLock struct {
f *os.File
}
func (l *unixLock) Release() error {
if err := l.set(false); err != nil {
return err
}
return l.f.Close()
}
func (l *unixLock) set(lock bool) error {
flock := syscall.Flock_t{
Type: syscall.F_UNLCK,
Start: 0,
Len: 0,
Whence: 1,
}
if lock {
flock.Type = syscall.F_WRLCK
}
return syscall.FcntlFlock(l.f.Fd(), syscall.F_SETLK, &flock)
}
func newLock(fileName string) (Releaser, error) {
f, err := os.OpenFile(fileName, os.O_RDWR|os.O_CREATE, 0644)
if err != nil {
return nil, err
}
l := &unixLock{f}
err = l.set(true)
if err != nil {
f.Close()
return nil, err
}
return l, nil
}

54
vendor/github.com/prometheus/prometheus/util/flock/flock_unix.go generated vendored Normal file
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@ -0,0 +1,54 @@
// Copyright 2016 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build darwin dragonfly freebsd linux netbsd openbsd
package flock
import (
"os"
"syscall"
)
type unixLock struct {
f *os.File
}
func (l *unixLock) Release() error {
if err := l.set(false); err != nil {
return err
}
return l.f.Close()
}
func (l *unixLock) set(lock bool) error {
how := syscall.LOCK_UN
if lock {
how = syscall.LOCK_EX
}
return syscall.Flock(int(l.f.Fd()), how|syscall.LOCK_NB)
}
func newLock(fileName string) (Releaser, error) {
f, err := os.OpenFile(fileName, os.O_RDWR|os.O_CREATE, 0644)
if err != nil {
return nil, err
}
l := &unixLock{f}
err = l.set(true)
if err != nil {
f.Close()
return nil, err
}
return l, nil
}

36
vendor/github.com/prometheus/prometheus/util/flock/flock_windows.go generated vendored Normal file
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@ -0,0 +1,36 @@
// Copyright 2016 The Prometheus Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package flock
import "syscall"
type windowsLock struct {
fd syscall.Handle
}
func (fl *windowsLock) Release() error {
return syscall.Close(fl.fd)
}
func newLock(fileName string) (Releaser, error) {
pathp, err := syscall.UTF16PtrFromString(fileName)
if err != nil {
return nil, err
}
fd, err := syscall.CreateFile(pathp, syscall.GENERIC_READ|syscall.GENERIC_WRITE, 0, nil, syscall.CREATE_ALWAYS, syscall.FILE_ATTRIBUTE_NORMAL, 0)
if err != nil {
return nil, err
}
return &windowsLock{fd}, nil
}

6
vendor/vendor.json vendored
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@ -255,6 +255,12 @@
"revision": "bf27d3ba8e1d9899d45a457ffac16c953eb2d647",
"revisionTime": "2017-02-11T19:53:22Z"
},
{
"checksumSHA1": "WbbxCn2jUYIL5viqLo0BKXEdPrQ=",
"path": "github.com/prometheus/prometheus/util/flock",
"revision": "3101606756c53221ed58ba94ecba6b26adf89dcc",
"revisionTime": "2017-08-14T17:01:13Z"
},
{
"checksumSHA1": "KAzbLjI9MzW2tjfcAsK75lVRp6I=",
"path": "github.com/rcrowley/go-metrics",