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Merge pull request #2887 from ipfs/deps/lock

Browse Source 
use locking lib at go4.org
This commit is contained in:
Jeromy Johnson
2016-06-21 21:09:46 -07:00
committed by GitHub
parent 472deb0e96 1fc8ffb769
commit 6e5420e5e0
14 changed files with 9 additions and 932 deletions
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1
Godeps/_workspace/src/github.com/camlistore/lock/.gitignore generated vendored
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*~

202
Godeps/_workspace/src/github.com/camlistore/lock/COPYING generated vendored
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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3
Godeps/_workspace/src/github.com/camlistore/lock/README.txt generated vendored
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File locking library.
See http://godoc.org/github.com/camlistore/lock

158
Godeps/_workspace/src/github.com/camlistore/lock/lock.go generated vendored
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/*
Copyright 2013 The Go 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 lock
import (
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
"sync"
)
// Lock locks the given file, creating the file if necessary. If the
// file already exists, it must have zero size or an error is returned.
// The lock is an exclusive lock (a write lock), but locked files
// should neither be read from nor written to. Such files should have
// zero size and only exist to co-ordinate ownership across processes.
//
// A nil Closer is returned if an error occurred. Otherwise, close that
// Closer to release the lock.
//
// On Linux, FreeBSD and OSX, a lock has the same semantics as fcntl(2)'s
// advisory locks. In particular, closing any other file descriptor for the
// same file will release the lock prematurely.
//
// Attempting to lock a file that is already locked by the current process
// has undefined behavior.
//
// On other operating systems, lock will fallback to using the presence and
// content of a file named name + '.lock' to implement locking behavior.
func Lock(name string) (io.Closer, error) {
return lockFn(name)
}
var lockFn = lockPortable
// Portable version not using fcntl. Doesn't handle crashes as gracefully,
// since it can leave stale lock files.
// TODO: write pid of owner to lock file and on race see if pid is
// still alive?
func lockPortable(name string) (io.Closer, error) {
absName, err := filepath.Abs(name)
if err != nil {
return nil, fmt.Errorf("can't Lock file %q: can't find abs path: %v", name, err)
}
fi, err := os.Stat(absName)
if err == nil && fi.Size() > 0 {
if isStaleLock(absName) {
os.Remove(absName)
} else {
return nil, fmt.Errorf("can't Lock file %q: has non-zero size", name)
}
}
f, err := os.OpenFile(absName, os.O_RDWR|os.O_CREATE|os.O_TRUNC|os.O_EXCL, 0666)
if err != nil {
return nil, fmt.Errorf("failed to create lock file %s %v", absName, err)
}
if err := json.NewEncoder(f).Encode(&pidLockMeta{OwnerPID: os.Getpid()}); err != nil {
return nil, err
}
return &lockCloser{f: f, abs: absName}, nil
}
type pidLockMeta struct {
OwnerPID int
}
func isStaleLock(path string) bool {
f, err := os.Open(path)
if err != nil {
return false
}
defer f.Close()
var meta pidLockMeta
if json.NewDecoder(f).Decode(&meta) != nil {
return false
}
if meta.OwnerPID == 0 {
return false
}
p, err := os.FindProcess(meta.OwnerPID)
if err != nil {
// e.g. on Windows
return true
}
// On unix, os.FindProcess always is true, so we have to send
// it a signal to see if it's alive.
if signalZero != nil {
if p.Signal(signalZero) != nil {
return true
}
}
return false
}
var signalZero os.Signal // nil or set by lock_sigzero.go
type lockCloser struct {
f *os.File
abs string
once sync.Once
err error
}
func (lc *lockCloser) Close() error {
lc.once.Do(lc.close)
return lc.err
}
func (lc *lockCloser) close() {
if err := lc.f.Close(); err != nil {
lc.err = err
}
if err := os.Remove(lc.abs); err != nil {
lc.err = err
}
}
var (
lockmu sync.Mutex
locked = map[string]bool{} // abs path -> true
)
// unlocker is used by the darwin and linux implementations with fcntl
// advisory locks.
type unlocker struct {
f *os.File
abs string
}
func (u *unlocker) Close() error {
lockmu.Lock()
// Remove is not necessary but it's nice for us to clean up.
// If we do do this, though, it needs to be before the
// u.f.Close below.
os.Remove(u.abs)
if err := u.f.Close(); err != nil {
return err
}
delete(locked, u.abs)
lockmu.Unlock()
return nil
}

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Godeps/_workspace/src/github.com/camlistore/lock/lock_appengine.go generated vendored
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// +build appengine
/*
Copyright 2013 The Go 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 lock
import (
"errors"
"io"
)
func init() {
lockFn = lockAppEngine
}
func lockAppEngine(name string) (io.Closer, error) {
return nil, errors.New("Lock not available on App Engine")
}

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Godeps/_workspace/src/github.com/camlistore/lock/lock_darwin_amd64.go generated vendored
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// +build darwin,amd64
// +build !appengine
/*
Copyright 2013 The Go 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 lock
import (
"fmt"
"io"
"os"
"path/filepath"
"syscall"
"unsafe"
)
func init() {
lockFn = lockFcntl
}
func lockFcntl(name string) (io.Closer, error) {
abs, err := filepath.Abs(name)
if err != nil {
return nil, err
}
lockmu.Lock()
if locked[abs] {
lockmu.Unlock()
return nil, fmt.Errorf("file %q already locked", abs)
}
locked[abs] = true
lockmu.Unlock()
fi, err := os.Stat(name)
if err == nil && fi.Size() > 0 {
return nil, fmt.Errorf("can't Lock file %q: has non-zero size", name)
}
f, err := os.Create(name)
if err != nil {
return nil, fmt.Errorf("Lock Create of %s (abs: %s) failed: %v", name, abs, err)
}
// This type matches C's "struct flock" defined in /usr/include/sys/fcntl.h.
// TODO: move this into the standard syscall package.
k := struct {
Start uint64 // sizeof(off_t): 8
Len uint64 // sizeof(off_t): 8
Pid uint32 // sizeof(pid_t): 4
Type uint16 // sizeof(short): 2
Whence uint16 // sizeof(short): 2
}{
Type: syscall.F_WRLCK,
Whence: uint16(os.SEEK_SET),
Start: 0,
Len: 0, // 0 means to lock the entire file.
Pid: uint32(os.Getpid()),
}
_, _, errno := syscall.Syscall(syscall.SYS_FCNTL, f.Fd(), uintptr(syscall.F_SETLK), uintptr(unsafe.Pointer(&k)))
if errno != 0 {
f.Close()
return nil, errno
}
return &unlocker{f, abs}, nil
}

79
Godeps/_workspace/src/github.com/camlistore/lock/lock_freebsd.go generated vendored
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@ -1,79 +0,0 @@
/*
Copyright 2013 The Go 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 lock
import (
"fmt"
"io"
"os"
"path/filepath"
"syscall"
"unsafe"
)
func init() {
lockFn = lockFcntl
}
func lockFcntl(name string) (io.Closer, error) {
abs, err := filepath.Abs(name)
if err != nil {
return nil, err
}
lockmu.Lock()
if locked[abs] {
lockmu.Unlock()
return nil, fmt.Errorf("file %q already locked", abs)
}
locked[abs] = true
lockmu.Unlock()
fi, err := os.Stat(name)
if err == nil && fi.Size() > 0 {
return nil, fmt.Errorf("can't Lock file %q: has non-zero size", name)
}
f, err := os.Create(name)
if err != nil {
return nil, err
}
// This type matches C's "struct flock" defined in /usr/include/fcntl.h.
// TODO: move this into the standard syscall package.
k := struct {
Start int64 /* off_t starting offset */
Len int64 /* off_t len = 0 means until end of file */
Pid int32 /* pid_t lock owner */
Type int16 /* short lock type: read/write, etc. */
Whence int16 /* short type of l_start */
Sysid int32 /* int remote system id or zero for local */
}{
Start: 0,
Len: 0, // 0 means to lock the entire file.
Pid: int32(os.Getpid()),
Type: syscall.F_WRLCK,
Whence: int16(os.SEEK_SET),
Sysid: 0,
}
_, _, errno := syscall.Syscall(syscall.SYS_FCNTL, f.Fd(), uintptr(syscall.F_SETLK), uintptr(unsafe.Pointer(&k)))
if errno != 0 {
f.Close()
return nil, errno
}
return &unlocker{f, abs}, nil
}

80
Godeps/_workspace/src/github.com/camlistore/lock/lock_linux_amd64.go generated vendored
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@ -1,80 +0,0 @@
// +build linux,amd64
// +build !appengine
/*
Copyright 2013 The Go 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 lock
import (
"fmt"
"io"
"os"
"path/filepath"
"syscall"
"unsafe"
)
func init() {
lockFn = lockFcntl
}
func lockFcntl(name string) (io.Closer, error) {
abs, err := filepath.Abs(name)
if err != nil {
return nil, err
}
lockmu.Lock()
if locked[abs] {
lockmu.Unlock()
return nil, fmt.Errorf("file %q already locked", abs)
}
locked[abs] = true
lockmu.Unlock()
fi, err := os.Stat(name)
if err == nil && fi.Size() > 0 {
return nil, fmt.Errorf("can't Lock file %q: has non-zero size", name)
}
f, err := os.Create(name)
if err != nil {
return nil, err
}
// This type matches C's "struct flock" defined in /usr/include/bits/fcntl.h.
// TODO: move this into the standard syscall package.
k := struct {
Type uint32
Whence uint32
Start uint64
Len uint64
Pid uint32
}{
Type: syscall.F_WRLCK,
Whence: uint32(os.SEEK_SET),
Start: 0,
Len: 0, // 0 means to lock the entire file.
Pid: uint32(os.Getpid()),
}
_, _, errno := syscall.Syscall(syscall.SYS_FCNTL, f.Fd(), uintptr(syscall.F_SETLK), uintptr(unsafe.Pointer(&k)))
if errno != 0 {
f.Close()
return nil, errno
}
return &unlocker{f, abs}, nil
}

81
Godeps/_workspace/src/github.com/camlistore/lock/lock_linux_arm.go generated vendored
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@ -1,81 +0,0 @@
// +build linux,arm
// +build !appengine
/*
Copyright 2013 The Go 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 lock
import (
"fmt"
"io"
"os"
"path/filepath"
"syscall"
"unsafe"
)
func init() {
lockFn = lockFcntl
}
func lockFcntl(name string) (io.Closer, error) {
abs, err := filepath.Abs(name)
if err != nil {
return nil, err
}
lockmu.Lock()
if locked[abs] {
lockmu.Unlock()
return nil, fmt.Errorf("file %q already locked", abs)
}
locked[abs] = true
lockmu.Unlock()
fi, err := os.Stat(name)
if err == nil && fi.Size() > 0 {
return nil, fmt.Errorf("can't Lock file %q: has non-zero size", name)
}
f, err := os.Create(name)
if err != nil {
return nil, err
}
// This type matches C's "struct flock" defined in /usr/include/bits/fcntl.h.
// TODO: move this into the standard syscall package.
k := struct {
Type uint16
Whence uint16
Start uint32
Len uint32
Pid uint32
}{
Type: syscall.F_WRLCK,
Whence: uint16(os.SEEK_SET),
Start: 0,
Len: 0, // 0 means to lock the entire file.
Pid: uint32(os.Getpid()),
}
const F_SETLK = 6 // actual value. syscall package is wrong: golang.org/issue/7059
_, _, errno := syscall.Syscall(syscall.SYS_FCNTL, f.Fd(), uintptr(F_SETLK), uintptr(unsafe.Pointer(&k)))
if errno != 0 {
f.Close()
return nil, errno
}
return &unlocker{f, abs}, nil
}

55
Godeps/_workspace/src/github.com/camlistore/lock/lock_plan9.go generated vendored
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@ -1,55 +0,0 @@
/*
Copyright 2013 The Go 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 lock
import (
"fmt"
"io"
"os"
"path/filepath"
)
func init() {
lockFn = lockPlan9
}
func lockPlan9(name string) (io.Closer, error) {
var f *os.File
abs, err := filepath.Abs(name)
if err != nil {
return nil, err
}
lockmu.Lock()
if locked[abs] {
lockmu.Unlock()
return nil, fmt.Errorf("file %q already locked", abs)
}
locked[abs] = true
lockmu.Unlock()
fi, err := os.Stat(name)
if err == nil && fi.Size() > 0 {
return nil, fmt.Errorf("can't Lock file %q: has non-zero size", name)
}
f, err = os.OpenFile(name, os.O_RDWR|os.O_CREATE, os.ModeExclusive|0644)
if err != nil {
return nil, fmt.Errorf("Lock Create of %s (abs: %s) failed: %v", name, abs, err)
}
return &unlocker{f, abs}, nil
}

26
Godeps/_workspace/src/github.com/camlistore/lock/lock_sigzero.go generated vendored
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@ -1,26 +0,0 @@
// +build !appengine
// +build linux darwin freebsd openbsd netbsd dragonfly
/*
Copyright 2013 The Go 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 lock
import "syscall"
func init() {
signalZero = syscall.Signal(0)
}

131
Godeps/_workspace/src/github.com/camlistore/lock/lock_test.go generated vendored
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@ -1,131 +0,0 @@
/*
Copyright 2013 The Go 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 lock
import (
"fmt"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
"strconv"
"testing"
)
func TestLock(t *testing.T) {
testLock(t, false)
}
func TestLockPortable(t *testing.T) {
testLock(t, true)
}
func TestLockInChild(t *testing.T) {
f := os.Getenv("TEST_LOCK_FILE")
if f == "" {
// not child
return
}
lock := Lock
if v, _ := strconv.ParseBool(os.Getenv("TEST_LOCK_PORTABLE")); v {
lock = lockPortable
}
lk, err := lock(f)
if err != nil {
log.Fatalf("Lock failed: %v", err)
}
if v, _ := strconv.ParseBool(os.Getenv("TEST_LOCK_CRASH")); v {
// Simulate a crash, or at least not unlocking the
// lock. We still exit 0 just to simplify the parent
// process exec code.
os.Exit(0)
}
lk.Close()
}
func testLock(t *testing.T, portable bool) {
lock := Lock
if portable {
lock = lockPortable
}
td, err := ioutil.TempDir("", "")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(td)
path := filepath.Join(td, "foo.lock")
childLock := func(crash bool) error {
cmd := exec.Command(os.Args[0], "-test.run=LockInChild$")
cmd.Env = []string{"TEST_LOCK_FILE=" + path}
if portable {
cmd.Env = append(cmd.Env, "TEST_LOCK_PORTABLE=1")
}
if crash {
cmd.Env = append(cmd.Env, "TEST_LOCK_CRASH=1")
}
out, err := cmd.CombinedOutput()
t.Logf("Child output: %q (err %v)", out, err)
if err != nil {
return fmt.Errorf("Child Process lock of %s failed: %v %s", path, err, out)
}
return nil
}
t.Logf("Locking in crashing child...")
if err := childLock(true); err != nil {
t.Fatalf("first lock in child process: %v", err)
}
t.Logf("Locking+unlocking in child...")
if err := childLock(false); err != nil {
t.Fatalf("lock in child process after crashing child: %v", err)
}
t.Logf("Locking in parent...")
lk1, err := lock(path)
if err != nil {
t.Fatal(err)
}
t.Logf("Again in parent...")
_, err = lock(path)
if err == nil {
t.Fatal("expected second lock to fail")
}
t.Logf("Locking in child...")
if childLock(false) == nil {
t.Fatalf("expected lock in child process to fail")
}
t.Logf("Unlocking lock in parent")
if err := lk1.Close(); err != nil {
t.Fatal(err)
}
lk3, err := lock(path)
if err != nil {
t.Fatal(err)
}
lk3.Close()
}

6
package.json
View File

@ -159,6 +159,12 @@
"hash": "QmVYxfoJQiZijTgPNHCHgHELvQpbsJNTg6Crmc3dQkj3yy",
"name": "golang-lru",
"version": "0.0.0"
},
{
"author": "whyrusleeping",
"hash": "QmWi28zbQG6B1xfaaWx5cYoLn3kBFU6pQ6GWQNRV5P6dNe",
"name": "lock",
"version": "0.0.0"
}
],
"gxVersion": "0.4.0",

7
repo/fsrepo/lock/lock.go
View File

@ -8,7 +8,7 @@ import (
"strings"
"syscall"
lock "github.com/ipfs/go-ipfs/Godeps/_workspace/src/github.com/camlistore/lock"
lock "gx/ipfs/QmWi28zbQG6B1xfaaWx5cYoLn3kBFU6pQ6GWQNRV5P6dNe/lock"
logging "gx/ipfs/QmYtB7Qge8cJpXc4irsEp8zRqfnZMBeB7aTrMEkPk67DRv/go-log"
"gx/ipfs/QmZNVWh8LLjAavuQ2JXuFmuYH3C11xo988vSgp7UQrTRj1/go-ipfs-util"
)
@ -25,8 +25,7 @@ func errPerm(path string) error {
}
func Lock(confdir string) (io.Closer, error) {
c, err := lock.Lock(path.Join(confdir, LockFile))
return c, err
return lock.Lock(path.Join(confdir, LockFile))
}
func Locked(confdir string) (bool, error) {
@ -41,7 +40,7 @@ func Locked(confdir string) (bool, error) {
log.Debugf("Someone else has the lock: %s", path.Join(confdir, LockFile))
return true, nil
}
if strings.Contains(err.Error(), "can't Lock file") {
if strings.Contains(err.Error(), "resource temporarily unavailable") {
log.Debugf("Can't lock file: %s.\n reason: %s", path.Join(confdir, LockFile), err.Error())
return true, nil
}