715c14f048
Replace all os.ReadFile, os.WriteFile, os.MkdirAll, os.Remove calls in pidfile.go and registry.go with coreio.Local equivalents (Read, Write, EnsureDir, Delete). Add forge.lthn.ai/core/go-io v0.1.2 as a direct dependency. Co-Authored-By: Virgil <virgil@lethean.io>
94 lines
2 KiB
Go
94 lines
2 KiB
Go
package process
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import (
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"fmt"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"syscall"
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coreio "forge.lthn.ai/core/go-io"
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)
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// PIDFile manages a process ID file for single-instance enforcement.
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type PIDFile struct {
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path string
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mu sync.Mutex
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}
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// NewPIDFile creates a PID file manager.
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func NewPIDFile(path string) *PIDFile {
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return &PIDFile{path: path}
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}
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// Acquire writes the current PID to the file.
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// Returns error if another instance is running.
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func (p *PIDFile) Acquire() error {
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p.mu.Lock()
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defer p.mu.Unlock()
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if data, err := coreio.Local.Read(p.path); err == nil {
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pid, err := strconv.Atoi(strings.TrimSpace(data))
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if err == nil && pid > 0 {
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if proc, err := os.FindProcess(pid); err == nil {
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if err := proc.Signal(syscall.Signal(0)); err == nil {
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return fmt.Errorf("another instance is running (PID %d)", pid)
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}
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}
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}
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_ = coreio.Local.Delete(p.path)
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}
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if dir := filepath.Dir(p.path); dir != "." {
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if err := coreio.Local.EnsureDir(dir); err != nil {
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return fmt.Errorf("failed to create PID directory: %w", err)
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}
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}
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pid := os.Getpid()
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if err := coreio.Local.Write(p.path, strconv.Itoa(pid)); err != nil {
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return fmt.Errorf("failed to write PID file: %w", err)
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}
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return nil
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}
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// Release removes the PID file.
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func (p *PIDFile) Release() error {
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p.mu.Lock()
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defer p.mu.Unlock()
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return coreio.Local.Delete(p.path)
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}
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// Path returns the PID file path.
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func (p *PIDFile) Path() string {
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return p.path
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}
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// ReadPID reads a PID file and checks if the process is still running.
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// Returns (pid, true) if the process is alive, (pid, false) if dead/stale,
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// or (0, false) if the file doesn't exist or is invalid.
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func ReadPID(path string) (int, bool) {
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data, err := coreio.Local.Read(path)
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if err != nil {
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return 0, false
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}
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pid, err := strconv.Atoi(strings.TrimSpace(data))
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if err != nil || pid <= 0 {
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return 0, false
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}
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proc, err := os.FindProcess(pid)
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if err != nil {
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return pid, false
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}
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if err := proc.Signal(syscall.Signal(0)); err != nil {
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return pid, false
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}
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return pid, true
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}
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