revert: tea 1.0 rewrite (#1122–#1126) (#1146)

Reverts #1126, #1125, #1124, #1123 and #1122. `go.mod` keeps the Go 1.26 line with toolchain `go1.26.9` (instead of the original `go1.26.6`) so the security fix from #1131 isn't lost. reopens #69 reopens #141 reopens #162 reopens #172 reopens #197 reopens #232 reopens #240 reopens #246 reopens #323 reopens #325 reopens #326 reopens #328 reopens #344 reopens #351 reopens #373 reopens #403 reopens #406 reopens #417 reopens #430 reopens #457 reopens #480 reopens #482 reopens #489 reopens #490 reopens #498 reopens #500 reopens #504 reopens #510 reopens #516 reopens #523 reopens #556 reopens #560 reopens #569 reopens #571 reopens #602 reopens #632 reopens #633 reopens #643 reopens #666 reopens #670 reopens #672 reopens #677 reopens #683 reopens #697 reopens #726 reopens #737 reopens #770 reopens #779 reopens #804 reopens #817 reopens #831 reopens #833 reopens #834 reopens #908 reopens #966 reopens #1023 reopens #1029 reopens #1032 reopens #1050 reopens #1052 reopens #1069 reopens #1073 reopens #1087 reopens #1091 reopens #1094 reopens #1110 reopens #1115 reopens #1116 reopens #1118 Reviewed-on: https://gitea.com/gitea/tea/pulls/1146 Reviewed-by: TheFox0x7 <95654+thefox0x7@noreply.gitea.com>
2026-10-26 11:01:25 +01:00 · 2026-10-18 20:56:33 +00:00
1 parent 33bb12729e
commit c5f674111a
@@ -0,0 +1,70 @@
+// Copyright 2026 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package filelock
+
+import (
+	"fmt"
+	"os"
+	"time"
+)
+
+const (
+	// DefaultTimeout is the default timeout for acquiring a file lock.
+	DefaultTimeout = 5 * time.Second
+
+	// FileLockPollInterval is how often to retry acquiring the file lock.
+	FileLockPollInterval = 50 * time.Millisecond
+)
+
+// Locker provides file-based locking with timeout.
+type Locker struct {
+	path    string
+	timeout time.Duration
+}
+
+// New creates a Locker for the given lock file path.
+func New(lockPath string, timeout time.Duration) *Locker {
+	return &Locker{
+		path:    lockPath,
+		timeout: timeout,
+	}
+}
+
+// WithLock executes fn while holding the lock.
+func (l *Locker) WithLock(fn func() error) (retErr error) {
+	unlock, err := l.Acquire()
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if unlockErr := unlock(); unlockErr != nil && retErr == nil {
+			retErr = fmt.Errorf("failed to release file lock: %w", unlockErr)
+		}
+	}()
+
+	return fn()
+}
+
+// Acquire acquires the file lock and returns an unlock function.
+// The caller must call the unlock function to release the lock.
+func (l *Locker) Acquire() (unlock func() error, err error) {
+	file, err := os.OpenFile(l.path, os.O_CREATE|os.O_RDWR, 0o600)
+	if err != nil {
+		return nil, fmt.Errorf("failed to open lock file: %w", err)
+	}
+
+	if err := lockFile(file, l.timeout); err != nil {
+		file.Close()
+		return nil, fmt.Errorf("failed to acquire file lock: %w", err)
+	}
+
+	return func() error {
+		unlockErr := unlockFile(file)
+		closeErr := file.Close()
+		if unlockErr != nil {
+			return unlockErr
+		}
+		return closeErr
+	}, nil
+}