213b3bab20
Prevents data loss from concurrent/interrupted state file writes by using atomic write pattern (write to .tmp, then rename). Changes: - Add internal/util package with AtomicWriteJSON/AtomicWriteFile helpers - Update witness/manager.go saveState to use atomic writes - Update refinery/manager.go saveState to use atomic writes - Update crew/manager.go saveState to use atomic writes - Update daemon/types.go SaveState to use atomic writes - Update polecat/namepool.go Save to use atomic writes - Add comprehensive tests for atomic write utilities 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
42 lines
1.1 KiB
Go
42 lines
1.1 KiB
Go
// Package util provides common utilities for Gas Town.
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package util
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import (
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"encoding/json"
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"os"
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)
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// AtomicWriteJSON writes JSON data to a file atomically.
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// It first writes to a temporary file, then renames it to the target path.
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// This prevents data corruption if the process crashes during write.
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// The rename operation is atomic on POSIX systems.
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func AtomicWriteJSON(path string, v interface{}) error {
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data, err := json.MarshalIndent(v, "", " ")
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if err != nil {
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return err
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}
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return AtomicWriteFile(path, data, 0644)
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}
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// AtomicWriteFile writes data to a file atomically.
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// It first writes to a temporary file, then renames it to the target path.
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// This prevents data corruption if the process crashes during write.
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// The rename operation is atomic on POSIX systems.
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func AtomicWriteFile(path string, data []byte, perm os.FileMode) error {
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tmpFile := path + ".tmp"
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// Write to temp file
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if err := os.WriteFile(tmpFile, data, perm); err != nil {
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return err
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}
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// Atomic rename (on POSIX systems)
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if err := os.Rename(tmpFile, path); err != nil {
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// Clean up temp file on failure
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_ = os.Remove(tmpFile)
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return err
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}
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return nil
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}
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