mirror of https://github.com/ethereum/go-ethereum
The lock file was ineffective because opening leveldb storage in read-only mode doesn't really take the lock. Fix it by including a dedicated flock library (which is actually split out of goleveldb).pull/15000/head
Felix Lange
7 years ago
parent
104375f398
commit
7e57fee355
@ -0,0 +1,201 @@ |
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Copyright 2010 The Go Authors |
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||||||
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||||||
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|
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|
LevelDB key/value database in Go |
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https://github.com/syndtr/goleveldb |
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|
Copyright 2012 Suryandaru Triandana |
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See https://github.com/syndtr/goleveldb/blob/master/LICENSE for license details. |
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|
||||||
|
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https://github.com/syndtr/gosnappy |
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Copyright 2011 The Snappy-Go Authors |
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See https://github.com/syndtr/gosnappy/blob/master/LICENSE for license details. |
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|
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go-zookeeper - Native ZooKeeper client for Go |
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https://github.com/samuel/go-zookeeper |
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Copyright (c) 2013, Samuel Stauffer <samuel@descolada.com> |
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See https://github.com/samuel/go-zookeeper/blob/master/LICENSE for license details. |
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@ -0,0 +1,46 @@ |
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// Copyright 2016 The Prometheus Authors
|
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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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||||||
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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,
|
||||||
|
// 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 flock provides portable file locking. It is essentially ripped out
|
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// from the code of github.com/syndtr/goleveldb. Strange enough that the
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// standard library does not provide this functionality. Once this package has
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// proven to work as expected, we should probably turn it into a separate
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// general purpose package for humanity.
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package flock |
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import ( |
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"os" |
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"path/filepath" |
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) |
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// Releaser provides the Release method to release a file lock.
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type Releaser interface { |
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Release() error |
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} |
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// New locks the file with the provided name. If the file does not exist, it is
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// created. The returned Releaser is used to release the lock. existed is true
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// if the file to lock already existed. A non-nil error is returned if the
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// locking has failed. Neither this function nor the returned Releaser is
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// goroutine-safe.
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func New(fileName string) (r Releaser, existed bool, err error) { |
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if err = os.MkdirAll(filepath.Dir(fileName), 0755); err != nil { |
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return |
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} |
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_, err = os.Stat(fileName) |
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existed = err == nil |
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r, err = newLock(fileName) |
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return |
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} |
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// Copyright 2016 The Prometheus Authors
|
||||||
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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.
|
||||||
|
// You may obtain a copy of the License at
|
||||||
|
//
|
||||||
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// http://www.apache.org/licenses/LICENSE-2.0
|
||||||
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//
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||||||
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// 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.
|
||||||
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|
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package flock |
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import "os" |
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type plan9Lock struct { |
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f *os.File |
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} |
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func (l *plan9Lock) Release() error { |
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return l.f.Close() |
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} |
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func newLock(fileName string) (Releaser, error) { |
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f, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, os.ModeExclusive|0644) |
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if err != nil { |
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return nil, err |
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} |
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return &plan9Lock{f}, nil |
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} |
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@ -0,0 +1,59 @@ |
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// Copyright 2016 The Prometheus Authors
|
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|
// 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
|
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|
//
|
||||||
|
// 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
|
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|
||||||
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package flock |
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|
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import ( |
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"os" |
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"syscall" |
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) |
||||||
|
|
||||||
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type unixLock struct { |
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f *os.File |
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} |
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|
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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 |
||||||
|
} |
||||||
@ -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 |
||||||
|
} |
||||||
@ -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 |
||||||
|
} |
||||||
Loading…
Reference in new issue