DeliveryRetryJob

server/README.md

@@ -3,9 +3,8 @@
 //TODO
 
 
- - background job for re-delivery
  - POST::/messages
- - https://firebase.google.com/docs/cloud-messaging/send-message#rest
+ - https://firebase.google.com/docs/cloud-messaging/send-message#rest  !!
  - List subscriptions on all owned channels (RESTful?)
  - deploy
  - full-text-search: https://www.sqlite.org/fts5.html#contentless_tables

server/api/handler/api.go

@@ -1110,6 +1110,11 @@ func (h APIHandler) DeleteMessage(g *gin.Context) ginresp.HTTPResponse {
 		return ginresp.InternAPIError(500, apierr.DATABASE_ERROR, "Failed to delete message", err)
 	}
 
+	err = h.database.CancelPendingDeliveries(ctx, msg.SCNMessageID)
+	if err != nil {
+		return ginresp.InternAPIError(500, apierr.DATABASE_ERROR, "Failed to cancel deliveries", err)
+	}
+
 	return ctx.FinishSuccess(ginresp.JSON(http.StatusOK, msg.FullJSON()))
 }
 

server/api/handler/message.go

@@ -5,7 +5,6 @@ import (
 	"blackforestbytes.com/simplecloudnotifier/common/ginresp"
 	"blackforestbytes.com/simplecloudnotifier/db"
 	"blackforestbytes.com/simplecloudnotifier/logic"
-	"blackforestbytes.com/simplecloudnotifier/models"
 	"database/sql"
 	"fmt"
 	"github.com/gin-gonic/gin"
@@ -277,7 +276,7 @@ func (h MessageHandler) sendMessageInternal(ctx *logic.AppContext, UserID *int64
 
 		for _, client := range clients {
 
-			fcmDelivID, err := h.deliverMessage(ctx, client, msg)
+			fcmDelivID, err := h.app.DeliverMessage(ctx, client, msg)
 			if err != nil {
 				_, err = h.database.CreateRetryDelivery(ctx, client, msg)
 				if err != nil {
@@ -306,15 +305,3 @@ func (h MessageHandler) sendMessageInternal(ctx *logic.AppContext, UserID *int64
 		SCNMessageID:   msg.SCNMessageID,
 	}))
 }
-
-func (h MessageHandler) deliverMessage(ctx *logic.AppContext, client models.Client, msg models.Message) (*string, error) {
-	if client.FCMToken != nil {
-		fcmDelivID, err := h.app.Firebase.SendNotification(ctx, client, msg)
-		if err != nil {
-			return nil, err
-		}
-		return langext.Ptr(fcmDelivID), nil
-	} else {
-		return langext.Ptr(""), nil
-	}
-}

server/cmd/scnserver/main.go

@@ -7,6 +7,7 @@ import (
 	"blackforestbytes.com/simplecloudnotifier/common/ginext"
 	"blackforestbytes.com/simplecloudnotifier/db"
 	"blackforestbytes.com/simplecloudnotifier/firebase"
+	"blackforestbytes.com/simplecloudnotifier/jobs"
 	"blackforestbytes.com/simplecloudnotifier/logic"
 	"fmt"
 	"github.com/rs/zerolog/log"
@@ -36,7 +37,9 @@ func main() {
 
 	fb := firebase.NewFirebaseApp()
 
-	app.Init(conf, ginengine, &fb)
+	jobRetry := jobs.NewDeliveryRetryJob(app)
+
+	app.Init(conf, ginengine, &fb, []logic.Job{jobRetry})
 
 	router.Init(ginengine)
 

server/db/deliveries.go

@@ -1,6 +1,7 @@
 package db
 
 import (
+	scn "blackforestbytes.com/simplecloudnotifier"
 	"blackforestbytes.com/simplecloudnotifier/models"
 	"gogs.mikescher.com/BlackForestBytes/goext/langext"
 	"time"
@@ -13,7 +14,7 @@ func (db *Database) CreateRetryDelivery(ctx TxContext, client models.Client, msg
 	}
 
 	now := time.Now().UTC()
-	next := now.Add(5 * time.Second)
+	next := scn.NextDeliveryTimestamp(now)
 
 	res, err := tx.ExecContext(ctx, "INSERT INTO deliveries (scn_message_id, receiver_user_id, receiver_client_id, timestamp_created, timestamp_finalized, status, fcm_message_id, next_delivery) VALUES (?, ?, ?, ?, ?, ?, ?, ?)",
 		msg.SCNMessageID,
@@ -86,3 +87,92 @@ func (db *Database) CreateSuccessDelivery(ctx TxContext, client models.Client, m
 		FCMMessageID:       langext.Ptr(fcmDelivID),
 	}, nil
 }
+
+func (db *Database) ListRetrieableDeliveries(ctx TxContext, pageSize int) ([]models.Delivery, error) {
+	tx, err := ctx.GetOrCreateTransaction(db)
+	if err != nil {
+		return nil, err
+	}
+
+	rows, err := tx.QueryContext(ctx, "SELECT * FROM deliveries WHERE status = 'RETRY' AND next_delivery < ? LIMIT ?",
+		time2DB(time.Now()),
+		pageSize)
+	if err != nil {
+		return nil, err
+	}
+
+	data, err := models.DecodeDeliveries(rows)
+	if err != nil {
+		return nil, err
+	}
+
+	return data, nil
+}
+
+func (db *Database) SetDeliverySuccess(ctx TxContext, delivery models.Delivery, fcmDelivID string) error {
+	tx, err := ctx.GetOrCreateTransaction(db)
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.ExecContext(ctx, "UPDATE deliveries SET status = 'SUCCESS', next_delivery = NULL, retry_count = ?, timestamp_finalized = ?, fcm_message_id = ? WHERE delivery_id = ?",
+		delivery.RetryCount+1,
+		time2DB(time.Now()),
+		fcmDelivID,
+		delivery.DeliveryID)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (db *Database) SetDeliveryFailed(ctx TxContext, delivery models.Delivery) error {
+	tx, err := ctx.GetOrCreateTransaction(db)
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.ExecContext(ctx, "UPDATE deliveries SET status = 'FAILED', next_delivery = NULL, retry_count = ?, timestamp_finalized = ? WHERE delivery_id = ?",
+		delivery.RetryCount+1,
+		time2DB(time.Now()),
+		delivery.DeliveryID)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (db *Database) SetDeliveryRetry(ctx TxContext, delivery models.Delivery) error {
+	tx, err := ctx.GetOrCreateTransaction(db)
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.ExecContext(ctx, "UPDATE deliveries SET status = 'RETRY', next_delivery = ?, retry_count = ? WHERE delivery_id = ?",
+		scn.NextDeliveryTimestamp(time.Now()),
+		delivery.RetryCount+1,
+		delivery.DeliveryID)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (db *Database) CancelPendingDeliveries(ctx TxContext, scnMessageID int64) error {
+	tx, err := ctx.GetOrCreateTransaction(db)
+	if err != nil {
+		return err
+	}
+
+	_, err = tx.ExecContext(ctx, "UPDATE deliveries SET status = 'FAILED', next_delivery = NULL, timestamp_finalized = ? WHERE scn_message_id = ? AND status = 'RETRY'",
+		time.Now(),
+		scnMessageID)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}

server/jobs/DeliveryRetryJob.go

@@ -0,0 +1,145 @@
+package jobs
+
+import (
+	"blackforestbytes.com/simplecloudnotifier/logic"
+	"blackforestbytes.com/simplecloudnotifier/models"
+	"github.com/rs/zerolog/log"
+	"time"
+)
+
+type DeliveryRetryJob struct {
+	app         *logic.Application
+	running     bool
+	stopChannel chan bool
+}
+
+func NewDeliveryRetryJob(app *logic.Application) *DeliveryRetryJob {
+	return &DeliveryRetryJob{
+		app:         app,
+		running:     true,
+		stopChannel: make(chan bool, 8),
+	}
+}
+
+func (j *DeliveryRetryJob) Start() {
+	if !j.running {
+		panic("cannot re-start job")
+	}
+
+	go j.mainLoop()
+}
+
+func (j *DeliveryRetryJob) Stop() {
+	j.running = false
+}
+
+func (j *DeliveryRetryJob) mainLoop() {
+	fastRerun := false
+
+	for j.running {
+		if fastRerun {
+			j.sleep(1 * time.Second)
+		} else {
+			j.sleep(30 * time.Second)
+		}
+		if !j.running {
+			return
+		}
+
+		fastRerun = j.run()
+
+	}
+}
+
+func (j *DeliveryRetryJob) run() bool {
+	defer func() {
+		if rec := recover(); rec != nil {
+			log.Error().Interface("rec", rec).Msg("Recovered panic in DeliveryRetryJob")
+		}
+	}()
+
+	ctx := j.app.NewSimpleTransactionContext(10 * time.Second)
+	defer ctx.Cancel()
+
+	deliveries, err := j.app.Database.ListRetrieableDeliveries(ctx, 32)
+	if err != nil {
+		log.Err(err).Msg("Failed to query retrieable deliveries")
+		return false
+	}
+
+	err = ctx.CommitTransaction()
+	if err != nil {
+		log.Err(err).Msg("Failed to commit")
+		return false
+	}
+
+	if len(deliveries) == 32 {
+		log.Warn().Msg("The delivery pipeline is greater than 32 (too much for a single cycle)")
+	}
+
+	for _, delivery := range deliveries {
+		j.redeliver(ctx, delivery)
+	}
+
+	return len(deliveries) == 32
+}
+
+func (j *DeliveryRetryJob) redeliver(ctx *logic.SimpleContext, delivery models.Delivery) {
+
+	client, err := j.app.Database.GetClient(ctx, delivery.ReceiverUserID, delivery.ReceiverClientID)
+	if err != nil {
+		log.Err(err).Int64("ReceiverUserID", delivery.ReceiverUserID).Int64("ReceiverClientID", delivery.ReceiverClientID).Msg("Failed to get client")
+		ctx.RollbackTransaction()
+		return
+	}
+
+	msg, err := j.app.Database.GetMessage(ctx, delivery.SCNMessageID)
+	if err != nil {
+		log.Err(err).Int64("SCNMessageID", delivery.SCNMessageID).Msg("Failed to get message")
+		ctx.RollbackTransaction()
+		return
+	}
+
+	fcmDelivID, err := j.app.DeliverMessage(ctx, client, msg)
+	if err != nil {
+		err = j.app.Database.SetDeliverySuccess(ctx, delivery, *fcmDelivID)
+		if err != nil {
+			log.Err(err).Int64("SCNMessageID", delivery.SCNMessageID).Int64("DeliveryID", delivery.DeliveryID).Msg("Failed to update delivery")
+			ctx.RollbackTransaction()
+			return
+		}
+	} else if delivery.RetryCount+1 > delivery.MaxRetryCount() {
+		err = j.app.Database.SetDeliveryFailed(ctx, delivery)
+		if err != nil {
+			log.Err(err).Int64("SCNMessageID", delivery.SCNMessageID).Int64("DeliveryID", delivery.DeliveryID).Msg("Failed to update delivery")
+			ctx.RollbackTransaction()
+			return
+		}
+	} else {
+		err = j.app.Database.SetDeliveryRetry(ctx, delivery)
+		if err != nil {
+			log.Err(err).Int64("SCNMessageID", delivery.SCNMessageID).Int64("DeliveryID", delivery.DeliveryID).Msg("Failed to update delivery")
+			ctx.RollbackTransaction()
+			return
+		}
+	}
+
+	err = ctx.CommitTransaction()
+
+}
+
+func (j *DeliveryRetryJob) sleep(d time.Duration) {
+	if !j.running {
+		return
+	}
+	afterCh := time.After(d)
+	for {
+		select {
+		case <-j.stopChannel:
+			j.stopChannel <- true
+			return
+		case <-afterCh:
+			return
+		}
+	}
+}

server/logic/application.go

@@ -29,6 +29,7 @@ type Application struct {
 	Database       *db.Database
 	Firebase       *firebase.App
 	DefaultChannel string
+	Jobs           []Job
 }
 
 func NewApp(db *db.Database) *Application {
@@ -38,10 +39,11 @@ func NewApp(db *db.Database) *Application {
 	}
 }
 
-func (app *Application) Init(cfg scn.Config, g *gin.Engine, fb *firebase.App) {
+func (app *Application) Init(cfg scn.Config, g *gin.Engine, fb *firebase.App, jobs []Job) {
 	app.Config = cfg
 	app.Gin = g
 	app.Firebase = fb
+	app.Jobs = jobs
 }
 
 func (app *Application) Run() {
@@ -59,22 +61,33 @@ func (app *Application) Run() {
 
 	stop := make(chan os.Signal, 1)
 	signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
+
+	for _, job := range app.Jobs {
+		job.Start()
+	}
+
 	select {
 	case <-stop:
 		ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 		defer cancel()
+
 		log.Info().Msg("Stopping HTTP-Server")
+
 		err := httpserver.Shutdown(ctx)
+
 		if err != nil {
 			log.Info().Err(err).Msg("Error while stopping the http-server")
-			return
+		} else {
-		}
 			log.Info().Msg("Stopped HTTP-Server")
+		}
 
 	case err := <-errChan:
 		log.Error().Err(err).Msg("HTTP-Server failed")
 	}
 
+	for _, job := range app.Jobs {
+		job.Start()
+	}
 }
 
 func (app *Application) GenerateRandomAuthKey() string {
@@ -147,6 +160,11 @@ func (app *Application) StartRequest(g *gin.Context, uri any, query any, body an
 	return actx, nil
 }
 
+func (app *Application) NewSimpleTransactionContext(timeout time.Duration) *SimpleContext {
+	ictx, cancel := context.WithTimeout(context.Background(), timeout)
+	return CreateSimpleContext(ictx, cancel)
+}
+
 func (app *Application) getPermissions(ctx *AppContext, hdr string) (PermissionSet, error) {
 	if hdr == "" {
 		return NewEmptyPermissions(), nil
@@ -222,3 +240,15 @@ func (app *Application) NormalizeUsername(v string) string {
 
 	return v
 }
+
+func (app *Application) DeliverMessage(ctx context.Context, client models.Client, msg models.Message) (*string, error) {
+	if client.FCMToken != nil {
+		fcmDelivID, err := app.Firebase.SendNotification(ctx, client, msg)
+		if err != nil {
+			return nil, err
+		}
+		return langext.Ptr(fcmDelivID), nil
+	} else {
+		return langext.Ptr(""), nil
+	}
+}

server/logic/jobs.go

@@ -0,0 +1,6 @@
+package logic
+
+type Job interface {
+	Start()
+	Stop()
+}

server/logic/simplecontext.go

@@ -0,0 +1,94 @@
+package logic
+
+import (
+	"blackforestbytes.com/simplecloudnotifier/db"
+	"context"
+	"database/sql"
+	"errors"
+	"github.com/rs/zerolog/log"
+	"time"
+)
+
+type SimpleContext struct {
+	inner       context.Context
+	cancelFunc  context.CancelFunc
+	cancelled   bool
+	transaction *sql.Tx
+}
+
+func CreateSimpleContext(innerCtx context.Context, cancelFn context.CancelFunc) *SimpleContext {
+	return &SimpleContext{
+		inner:       innerCtx,
+		cancelFunc:  cancelFn,
+		cancelled:   false,
+		transaction: nil,
+	}
+}
+
+func (sc *SimpleContext) Deadline() (deadline time.Time, ok bool) {
+	return sc.inner.Deadline()
+}
+
+func (sc *SimpleContext) Done() <-chan struct{} {
+	return sc.inner.Done()
+}
+
+func (sc *SimpleContext) Err() error {
+	return sc.inner.Err()
+}
+
+func (sc *SimpleContext) Value(key any) any {
+	return sc.inner.Value(key)
+}
+
+func (sc *SimpleContext) Cancel() {
+	sc.cancelled = true
+	if sc.transaction != nil {
+		log.Error().Msg("Rollback transaction")
+		err := sc.transaction.Rollback()
+		if err != nil {
+			panic("failed to rollback transaction: " + err.Error())
+		}
+		sc.transaction = nil
+	}
+	sc.cancelFunc()
+}
+
+func (sc *SimpleContext) GetOrCreateTransaction(db *db.Database) (*sql.Tx, error) {
+	if sc.cancelled {
+		return nil, errors.New("context cancelled")
+	}
+	if sc.transaction != nil {
+		return sc.transaction, nil
+	}
+	tx, err := db.BeginTx(sc)
+	if err != nil {
+		return nil, err
+	}
+	sc.transaction = tx
+	return tx, nil
+}
+
+func (sc *SimpleContext) CommitTransaction() error {
+	if sc.transaction == nil {
+		return nil
+	}
+	err := sc.transaction.Commit()
+	if err != nil {
+		return err
+	}
+	sc.transaction = nil
+	return nil
+}
+
+func (sc *SimpleContext) RollbackTransaction() {
+	if sc.transaction == nil {
+		return
+	}
+	err := sc.transaction.Rollback()
+	if err != nil {
+		panic(err)
+	}
+	sc.transaction = nil
+	return
+}

server/models/delivery.go

@@ -43,6 +43,10 @@ func (d Delivery) JSON() DeliveryJSON {
 	}
 }
 
+func (d Delivery) MaxRetryCount() int {
+	return 5
+}
+
 type DeliveryJSON struct {
 	DeliveryID         int64          `json:"delivery_id"`
 	SCNMessageID       int64          `json:"scn_message_id"`

server/util.go

@@ -8,3 +8,7 @@ import (
 func QuotaDayString() string {
 	return time.Now().In(timeext.TimezoneBerlin).Format("2006-01-02")
 }
+
+func NextDeliveryTimestamp(now time.Time) time.Time {
+	return now.Add(5 * time.Second)
+}