feat(drivers): implement in-process cron scheduler driver plugin

backend/plugins/drivers/driver_inproc_cron/scheduler.go

@@ -0,0 +1,116 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package driver_inproc_cron
+
+import (
+	"context"
+	"encoding/json"
+	"sync"
+
+	"Wavelet/core/extpoints"
+	"Wavelet/pkg/logger"
+	"Wavelet/plugins/drivers/driver_inproc_worker"
+	"github.com/robfig/cron/v3"
+)
+
+type inprocScheduler struct {
+	mu          sync.RWMutex
+	cronRunner  *cron.Cron
+	scheduleReg extpoints.ScheduleExtension
+	taskReg     extpoints.TaskExtension
+	running     bool
+}
+
+func newInprocScheduler(scheduleReg extpoints.ScheduleExtension, taskReg extpoints.TaskExtension) *inprocScheduler {
+	return &inprocScheduler{
+		cronRunner:  cron.New(cron.WithSeconds()),
+		scheduleReg: scheduleReg,
+		taskReg:     taskReg,
+	}
+}
+
+func (s *inprocScheduler) Start() error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if s.running {
+		return nil
+	}
+
+	if s.scheduleReg != nil {
+		for _, def := range s.scheduleReg.Schedules() {
+			s.registerJob(def)
+		}
+	}
+
+	s.cronRunner.Start()
+	s.running = true
+	return nil
+}
+
+func (s *inprocScheduler) Stop() {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if !s.running {
+		return
+	}
+
+	ctx := s.cronRunner.Stop()
+	<-ctx.Done()
+	s.running = false
+}
+
+func (s *inprocScheduler) registerJob(def extpoints.ScheduleDefinition) {
+	spec := def.Spec
+	taskType := def.TaskType
+
+	// Support 5-field cron expression by prepending "0 " for 6-field seconds parser
+	fields := len(cronFields(spec))
+	cronSpec := spec
+	if fields == 5 {
+		cronSpec = "0 " + spec
+	}
+
+	var payloadBytes []byte
+	if def.Payload != nil {
+		switch p := def.Payload.(type) {
+		case []byte:
+			payloadBytes = p
+		case string:
+			payloadBytes = []byte(p)
+		default:
+			payloadBytes, _ = json.Marshal(p)
+		}
+	}
+
+	_, err := s.cronRunner.AddFunc(cronSpec, func() {
+		_, dispatchErr := driver_inproc_worker.DispatchTask(context.Background(), taskType, payloadBytes, "inproc_cron")
+		if dispatchErr != nil {
+			logger.ErrorF(context.Background(), "driver_inproc_cron: dispatch task %q failed: %v", taskType, dispatchErr)
+		}
+	})
+	if err != nil {
+		logger.ErrorF(context.Background(), "driver_inproc_cron: invalid cron spec %q for task %q: %v", spec, taskType, err)
+	}
+}
+
+func cronFields(s string) []string {
+	var fields []string
+	var current []rune
+	for _, r := range s {
+		if r == ' ' || r == '\t' {
+			if len(current) > 0 {
+				fields = append(fields, string(current))
+				current = nil
+			}
+		} else {
+			current = append(current, r)
+		}
+	}
+	if len(current) > 0 {
+		fields = append(fields, string(current))
+	}
+	return fields
+}