Init V4 community edition (#2265)

* Init V4 community edition

* Init V4 community edition

pkg/crontab/crontab.go

@@ -0,0 +1,73 @@
+package crontab
+
+import (
+	"context"
+	"fmt"
+	"github.com/cloudreve/Cloudreve/v4/application/dependency"
+	"github.com/cloudreve/Cloudreve/v4/ent"
+	"github.com/cloudreve/Cloudreve/v4/inventory"
+	"github.com/cloudreve/Cloudreve/v4/pkg/logging"
+	"github.com/cloudreve/Cloudreve/v4/pkg/setting"
+	"github.com/gofrs/uuid"
+	"github.com/robfig/cron/v3"
+)
+
+type (
+	CronTaskFunc     func(ctx context.Context)
+	cornRegistration struct {
+		t      setting.CronType
+		config string
+		fn     CronTaskFunc
+	}
+)
+
+var (
+	registrations []cornRegistration
+)
+
+// Register registers a cron task.
+func Register(t setting.CronType, fn CronTaskFunc) {
+	registrations = append(registrations, cornRegistration{
+		t:  t,
+		fn: fn,
+	})
+}
+
+// NewCron constructs a new cron instance with given dependency.
+func NewCron(ctx context.Context, dep dependency.Dep) (*cron.Cron, error) {
+	settings := dep.SettingProvider()
+	userClient := dep.UserClient()
+	anonymous, err := userClient.AnonymousUser(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("cron: faield to get anonymous user: %w", err)
+	}
+
+	l := dep.Logger()
+	l.Info("Initialize crontab jobs...")
+	c := cron.New()
+
+	for _, r := range registrations {
+		cronConfig := settings.Cron(ctx, r.t)
+		if _, err := c.AddFunc(cronConfig, taskWrapper(string(r.t), cronConfig, anonymous, dep, r.fn)); err != nil {
+			l.Warning("Failed to start crontab job %q: %s", cronConfig, err)
+		}
+	}
+
+	return c, nil
+}
+
+func taskWrapper(name, config string, user *ent.User, dep dependency.Dep, task CronTaskFunc) func() {
+	l := dep.Logger()
+	l.Info("Cron task %s started with config %q", name, config)
+	return func() {
+		cid := uuid.Must(uuid.NewV4())
+		l.Info("Executing Cron task %q with Cid %q", name, cid)
+		ctx := context.Background()
+		l := dep.Logger().CopyWithPrefix(fmt.Sprintf("[Cid: %s Cron: %s]", cid, name))
+		ctx = dep.ForkWithLogger(ctx, l)
+		ctx = context.WithValue(ctx, logging.CorrelationIDCtx{}, cid)
+		ctx = context.WithValue(ctx, logging.LoggerCtx{}, l)
+		ctx = context.WithValue(ctx, inventory.UserCtx{}, user)
+		task(ctx)
+	}
+}