persist process session metadata for restart-safe process tool state

pkg/agent/loop.go

@@ -63,7 +63,7 @@ func NewAgentLoop(cfg *config.Config, msgBus *bus.MessageBus, provider providers
 	sessionsManager := session.NewSessionManager(filepath.Join(filepath.Dir(cfg.WorkspacePath()), "sessions"))
 
 	toolsRegistry := tools.NewToolRegistry()
-	processManager := tools.NewProcessManager()
+	processManager := tools.NewProcessManager(workspace)
 	readTool := tools.NewReadFileTool(workspace)
 	writeTool := tools.NewWriteFileTool(workspace)
 	listTool := tools.NewListDirTool(workspace)

pkg/tools/process_manager.go

@@ -2,10 +2,14 @@ package tools
 
 import (
 	"bytes"
+	"encoding/json"
 	"fmt"
+	"os"
 	"os/exec"
+	"path/filepath"
 	"sort"
 	"strconv"
+	"strings"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -27,10 +31,18 @@ type ProcessManager struct {
 	mu       sync.RWMutex
 	sessions map[string]*processSession
 	seq      uint64
+	metaPath string
 }
 
-func NewProcessManager() *ProcessManager {
+func NewProcessManager(workspace string) *ProcessManager {
-	return &ProcessManager{sessions: map[string]*processSession{}}
+	m := &ProcessManager{sessions: map[string]*processSession{}}
+	if workspace != "" {
+		memDir := filepath.Join(workspace, "memory")
+		_ = os.MkdirAll(memDir, 0755)
+		m.metaPath = filepath.Join(memDir, "process-sessions.json")
+		m.load()
+	}
+	return m
 }
 
 func (m *ProcessManager) Start(command, cwd string) (string, error) {
@@ -52,6 +64,7 @@ func (m *ProcessManager) Start(command, cwd string) (string, error) {
 	m.mu.Lock()
 	m.sessions[id] = s
 	m.mu.Unlock()
+	m.persist()
 
 	if err := cmd.Start(); err != nil {
 		m.mu.Lock()
@@ -76,6 +89,7 @@ func (m *ProcessManager) Start(command, cwd string) (string, error) {
 		s.EndedAt = time.Now().UTC()
 		s.ExitCode = &code
 		s.mu.Unlock()
+		m.persist()
 		close(s.done)
 	}()
 
@@ -162,5 +176,91 @@ func (m *ProcessManager) Kill(id string) error {
 	if cmd.Process == nil {
 		return fmt.Errorf("process not started")
 	}
-	return cmd.Process.Kill()
+	err := cmd.Process.Kill()
+	m.persist()
+	return err
+}
+
+type processSessionMeta struct {
+	ID        string `json:"id"`
+	Command   string `json:"command"`
+	StartedAt string `json:"started_at"`
+	EndedAt   string `json:"ended_at,omitempty"`
+	ExitCode  *int   `json:"exit_code,omitempty"`
+	Recovered bool   `json:"recovered"`
+}
+
+func (m *ProcessManager) persist() {
+	if m.metaPath == "" {
+		return
+	}
+	m.mu.RLock()
+	items := make([]processSessionMeta, 0, len(m.sessions))
+	for _, s := range m.sessions {
+		s.mu.RLock()
+		row := processSessionMeta{
+			ID:        s.ID,
+			Command:   s.Command,
+			StartedAt: s.StartedAt.Format(time.RFC3339),
+			Recovered: s.cmd == nil,
+		}
+		if !s.EndedAt.IsZero() {
+			row.EndedAt = s.EndedAt.Format(time.RFC3339)
+		}
+		if s.ExitCode != nil {
+			code := *s.ExitCode
+			row.ExitCode = &code
+		}
+		s.mu.RUnlock()
+		items = append(items, row)
+	}
+	m.mu.RUnlock()
+	data, err := json.MarshalIndent(items, "", "  ")
+	if err != nil {
+		return
+	}
+	_ = os.WriteFile(m.metaPath, data, 0644)
+}
+
+func (m *ProcessManager) load() {
+	if m.metaPath == "" {
+		return
+	}
+	data, err := os.ReadFile(m.metaPath)
+	if err != nil {
+		return
+	}
+	var items []processSessionMeta
+	if err := json.Unmarshal(data, &items); err != nil {
+		return
+	}
+	maxSeq := uint64(0)
+	for _, it := range items {
+		s := &processSession{ID: it.ID, Command: it.Command, done: make(chan struct{})}
+		if t, err := time.Parse(time.RFC3339, it.StartedAt); err == nil {
+			s.StartedAt = t
+		}
+		if it.EndedAt != "" {
+			if t, err := time.Parse(time.RFC3339, it.EndedAt); err == nil {
+				s.EndedAt = t
+			}
+		}
+		if it.ExitCode != nil {
+			code := *it.ExitCode
+			s.ExitCode = &code
+			close(s.done)
+		} else {
+			code := -2
+			s.ExitCode = &code
+			s.EndedAt = time.Now().UTC()
+			close(s.done)
+		}
+		m.sessions[s.ID] = s
+		if strings.HasPrefix(s.ID, "p-") {
+			if n, err := strconv.ParseUint(strings.TrimPrefix(s.ID, "p-"), 10, 64); err == nil && n > maxSeq {
+				maxSeq = n
+			}
+		}
+	}
+	m.seq = maxSeq
 }