ARTEX/server/scheduler.go

package server

import (
	"context"
	"encoding/json"
	"fmt"
	"log"
	"strconv"
	"time"

	"github.com/Autumn-27/artex/db"
)

// Scheduler drives P3 triggers: on each tick it fires due interval triggers and
// scans for new findings / newly-met goals (any task) to fire event triggers.
// Each fire enqueues a NEW conversation on the agent's per-agent trigger queue
// (StartTriggeredRun): fires for the same agent run one at a time in FIFO order,
// distinct agents still run concurrently. State is persisted (per-trigger last_fire
// + finding watermark + fired-goal set) so a restart resumes without double-firing.
// Triggers only attach to CUSTOM agents.
type Scheduler struct {
	s    *Server
	pg   *db.DB
	tick time.Duration
}

const (
	schedKeyLastFinding = "last_finding_id"  // watermark: max finding node id fired for
	schedKeyFiredGoals  = "fired_goals"      // JSON array of goal node ids already fired
	schedKeyLastTimeout = "last_timeout_id"  // watermark: max task id fired for task timeout
)

func newScheduler(s *Server) *Scheduler {
	return &Scheduler{s: s, pg: s.m.pg, tick: 5 * time.Second}
}

// Run loops until ctx is done, ticking the scheduler. Started once from server New.
func (sc *Scheduler) Run(ctx context.Context) {
	if sc.pg == nil {
		return
	}
	sc.init()
	t := time.NewTicker(sc.tick)
	defer t.Stop()
	for {
		select {
		case <-ctx.Done():
			return
		case <-t.C:
			sc.step()
		}
	}
}

// init seeds the watermarks on first run so pre-existing findings/goals don't all
// fire at once — only events created AFTER the scheduler first starts count.
func (sc *Scheduler) init() {
	if sc.mustState(schedKeyLastFinding) == "" {
		var maxID int64
		if evs, err := sc.pg.NewFindingsSince(0); err == nil {
			for _, e := range evs {
				if e.NodeID > maxID {
					maxID = e.NodeID
				}
			}
		}
		_ = sc.pg.SetSchedState(schedKeyLastFinding, strconv.FormatInt(maxID, 10))
	}
	if sc.mustState(schedKeyFiredGoals) == "" {
		set := map[int64]bool{}
		if evs, err := sc.pg.MetGoals(); err == nil {
			for _, e := range evs {
				set[e.NodeID] = true
			}
		}
		sc.saveFiredGoalSet(set)
	}
	if sc.mustState(schedKeyLastTimeout) == "" {
		var maxID int64
		if evs, err := sc.pg.TimedOutTasksSince(0); err == nil {
			for _, e := range evs {
				if e.NodeID > maxID {
					maxID = e.NodeID
				}
			}
		}
		_ = sc.pg.SetSchedState(schedKeyLastTimeout, strconv.FormatInt(maxID, 10))
	}
}

func (sc *Scheduler) step() {
	triggers, err := sc.pg.ListEnabledTriggers()
	if err != nil {
		return
	}
	if len(triggers) == 0 {
		return
	}
	sc.fireIntervals(triggers)
	sc.fireFindings(triggers)
	sc.fireGoals(triggers)
	sc.fireTaskTimeouts(triggers)
}

// fireIntervals fires triggers whose interval has elapsed since last_fire.
func (sc *Scheduler) fireIntervals(triggers []*db.AgentTrigger) {
	now := time.Now()
	for _, tr := range triggers {
		if tr.IntervalSec <= 0 {
			continue
		}
		due := tr.LastFire == nil || now.Sub(*tr.LastFire) >= time.Duration(tr.IntervalSec)*time.Second
		if !due {
			continue
		}
		_ = sc.pg.TouchTriggerFire(tr.ID)
		ctx := "\n\n【本次为定时触发】" + now.Format(" 2006-01-02 15:04:05 MST")
		sc.s.StartTriggeredRun(tr.AgentKey, fmt.Sprintf("定时触发 · %s", now.Format("15:04")), tr.IntervalMessage+ctx, 0, false)
	}
}

// fireFindings fires on_finding triggers for findings above the persisted
// watermark (monotonic node id → no double-fire across restarts).
func (sc *Scheduler) fireFindings(triggers []*db.AgentTrigger) {
	var want []*db.AgentTrigger
	for _, tr := range triggers {
		if tr.OnFinding {
			want = append(want, tr)
		}
	}
	if len(want) == 0 {
		return
	}
	last, _ := strconv.ParseInt(sc.mustState(schedKeyLastFinding), 10, 64)
	events, err := sc.pg.NewFindingsSince(last)
	if err != nil || len(events) == 0 {
		return
	}
	maxID := last
	for _, e := range events {
		if e.NodeID > maxID {
			maxID = e.NodeID
		}
		msgCtx := fmt.Sprintf("\n\n【本次由任务发现 finding 触发】\n任务: #%d %s（目标：%s）\n发现: [%s/%s] %s",
			e.TaskID, e.TaskDesc, e.TaskGoal, e.VulnClass, e.Severity, e.Summary)
		for _, tr := range want {
			sc.s.StartTriggeredRun(tr.AgentKey, fmt.Sprintf("finding 触发 · task#%d", e.TaskID), tr.FindingMessage+msgCtx, e.TaskID, true)
		}
	}
	_ = sc.pg.SetSchedState(schedKeyLastFinding, strconv.FormatInt(maxID, 10))
}

// fireGoals fires on_goal_met triggers for met goals not yet in the fired set.
func (sc *Scheduler) fireGoals(triggers []*db.AgentTrigger) {
	var want []*db.AgentTrigger
	for _, tr := range triggers {
		if tr.OnGoalMet {
			want = append(want, tr)
		}
	}
	if len(want) == 0 {
		return
	}
	events, err := sc.pg.MetGoals()
	if err != nil || len(events) == 0 {
		return
	}
	fired := sc.firedGoalSet()
	changed := false
	for _, e := range events {
		if fired[e.NodeID] {
			continue
		}
		fired[e.NodeID] = true
		changed = true
		msgCtx := fmt.Sprintf("\n\n【本次由任务完成目标触发】\n任务: #%d %s（目标：%s）\n达成目标: %s",
			e.TaskID, e.TaskDesc, e.TaskGoal, e.Summary)
		for _, tr := range want {
			sc.s.StartTriggeredRun(tr.AgentKey, fmt.Sprintf("目标触发 · task#%d", e.TaskID), tr.GoalMessage+msgCtx, e.TaskID, true)
		}
	}
	if changed {
		sc.saveFiredGoalSet(fired)
	}
}

// fireTaskTimeouts fires on_task_timeout triggers for tasks that newly reached
// status='timeout' above the persisted watermark (task id → no double-fire).
func (sc *Scheduler) fireTaskTimeouts(triggers []*db.AgentTrigger) {
	var want []*db.AgentTrigger
	for _, tr := range triggers {
		if tr.OnTaskTimeout {
			want = append(want, tr)
		}
	}
	if len(want) == 0 {
		return
	}
	last, _ := strconv.ParseInt(sc.mustState(schedKeyLastTimeout), 10, 64)
	events, err := sc.pg.TimedOutTasksSince(last)
	if err != nil || len(events) == 0 {
		return
	}
	maxID := last
	for _, e := range events {
		if e.NodeID > maxID {
			maxID = e.NodeID
		}
		msgCtx := fmt.Sprintf("\n\n【本次由任务超时触发】\n任务: #%d %s（目标：%s）",
			e.TaskID, e.TaskDesc, e.TaskGoal)
		for _, tr := range want {
			sc.s.StartTriggeredRun(tr.AgentKey, fmt.Sprintf("超时触发 · task#%d", e.TaskID), tr.TaskTimeoutMessage+msgCtx, e.TaskID, true)
		}
	}
	_ = sc.pg.SetSchedState(schedKeyLastTimeout, strconv.FormatInt(maxID, 10))
}

func (sc *Scheduler) mustState(key string) string {
	v, _ := sc.pg.GetSchedState(key)
	return v
}

func (sc *Scheduler) firedGoalSet() map[int64]bool {
	out := map[int64]bool{}
	raw := sc.mustState(schedKeyFiredGoals)
	if raw == "" {
		return out
	}
	var ids []int64
	if json.Unmarshal([]byte(raw), &ids) == nil {
		for _, id := range ids {
			out[id] = true
		}
	}
	return out
}

func (sc *Scheduler) saveFiredGoalSet(set map[int64]bool) {
	ids := make([]int64, 0, len(set))
	for id := range set {
		ids = append(ids, id)
	}
	b, _ := json.Marshal(ids)
	if err := sc.pg.SetSchedState(schedKeyFiredGoals, string(b)); err != nil {
		log.Printf("[scheduler] save fired goals failed: %v", err)
	}
}