add cron schedule to xnav

config/xnav.yaml

@@ -30,6 +30,7 @@ crossExchangeStrategies:
 
 - xnav:
     interval: 1h
+    # schedule: "0 * * * *" # every hour
     reportOnStart: true
     ignoreDusts: true
 

pkg/strategy/xnav/strategy.go

@@ -2,19 +2,19 @@ package xnav
 
 import (
 	"context"
+	"fmt"
 	"sync"
 	"time"
 
-	"github.com/c9s/bbgo/pkg/fixedpoint"
-	"github.com/c9s/bbgo/pkg/util/templateutil"
-
-	"github.com/pkg/errors"
-	"github.com/sirupsen/logrus"
-	"github.com/slack-go/slack"
-
 	"github.com/c9s/bbgo/pkg/bbgo"
+	"github.com/c9s/bbgo/pkg/fixedpoint"
 	"github.com/c9s/bbgo/pkg/types"
 	"github.com/c9s/bbgo/pkg/util"
+	"github.com/c9s/bbgo/pkg/util/templateutil"
+
+	"github.com/robfig/cron/v3"
+	"github.com/sirupsen/logrus"
+	"github.com/slack-go/slack"
 )
 
 const ID = "xnav"
@@ -59,16 +59,30 @@ type Strategy struct {
 	*bbgo.Environment
 
 	Interval      types.Interval `json:"interval"`
+	Schedule      string         `json:"schedule"`
 	ReportOnStart bool           `json:"reportOnStart"`
 	IgnoreDusts   bool           `json:"ignoreDusts"`
 
 	State *State `persistence:"state"`
+
+	cron *cron.Cron
 }
 
 func (s *Strategy) ID() string {
 	return ID
 }
 
+func (s *Strategy) Initialize() error {
+	return nil
+}
+
+func (s *Strategy) Validate() error {
+	if s.Interval == "" && s.Schedule == "" {
+		return fmt.Errorf("interval or schedule is required")
+	}
+	return nil
+}
+
 var Ten = fixedpoint.NewFromInt(10)
 
 func (s *Strategy) CrossSubscribe(sessions map[string]*bbgo.ExchangeSession) {}
@@ -138,10 +152,6 @@ func (s *Strategy) recordNetAssetValue(ctx context.Context, sessions map[string]
 }
 
 func (s *Strategy) CrossRun(ctx context.Context, _ bbgo.OrderExecutionRouter, sessions map[string]*bbgo.ExchangeSession) error {
-	if s.Interval == "" {
-		return errors.New("interval can not be empty")
-	}
-
 	if s.State == nil {
 		s.State = &State{}
 		s.State.Reset()
@@ -161,11 +171,7 @@ func (s *Strategy) CrossRun(ctx context.Context, _ bbgo.OrderExecutionRouter, se
 		log.Warnf("xnav does not support backtesting")
 	}
 
-	// TODO: if interval is supported, we can use kline as the ticker
+	if s.Interval != "" {
-	if _, ok := types.SupportedIntervals[s.Interval]; ok {
-
-	}
-
 		go func() {
 			ticker := time.NewTicker(util.MillisecondsJitter(s.Interval.Duration(), 1000))
 			defer ticker.Stop()
@@ -181,5 +187,16 @@ func (s *Strategy) CrossRun(ctx context.Context, _ bbgo.OrderExecutionRouter, se
 			}
 		}()
 
+	} else if s.Schedule != "" {
+		s.cron = cron.New()
+		_, err := s.cron.AddFunc(s.Schedule, func() {
+			s.recordNetAssetValue(ctx, sessions)
+		})
+		if err != nil {
+			return err
+		}
+		s.cron.Start()
+	}
+
 	return nil
 }