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push.go
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push.go
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package push
import (
"context"
"errors"
"strings"
"time"
log "github.com/sirupsen/logrus"
"github.com/ARGOeu/argo-messaging/brokers"
"github.com/ARGOeu/argo-messaging/messages"
"github.com/ARGOeu/argo-messaging/stores"
"github.com/ARGOeu/argo-messaging/subscriptions"
)
// Pusher holds information for the pusher routine and subscription
type Pusher struct {
id int
sub subscriptions.Subscription
endpoint string
retryPolicy string
retryPeriod int
stop chan int // 1: Stop 2: restart
rate time.Duration // in milliseconds
running bool
sndr Sender
mgr *Manager
}
// Manager manages all pusher routines
type Manager struct {
list map[string]*Pusher // map using as key the string = "{project}/{sub}"
broker brokers.Broker // Reference to backend broker
store stores.Store // Reference to backend store
sender Sender // Reference to send mechanism (HTTP client)
}
// LoadPushSubs is called during API initialization to retrieve available
// push configured subs and activate them
func (mgr *Manager) LoadPushSubs() {
results := subscriptions.LoadPushSubs(mgr.store)
// Add all of them
for _, item := range results.Subscriptions {
mgr.Add(item.ProjectUUID, item.Name)
}
}
// StartAll enables all pushsers
func (mgr *Manager) StartAll() {
for k := range mgr.list {
item := mgr.list[k]
item.launch(mgr.broker, mgr.store.Clone())
}
}
// StopAll stops Activity on all pushers
func (mgr *Manager) StopAll() error {
for k := range mgr.list {
project, sub, err := splitPSub(k)
if err != nil {
return err
}
mgr.Stop(project, sub)
}
return nil
}
// RemoveProjectAll stops and removes all pushers related to a project
func (mgr *Manager) RemoveProjectAll(projectUUID string) error {
// collect all subs to be removed here
subsToRemove := []string{}
// Iterate and stop all relevant subs
for k := range mgr.list {
project, sub, err := splitPSub(k)
if err != nil {
return err
}
if project == projectUUID {
mgr.Stop(projectUUID, sub)
subsToRemove = append(subsToRemove, sub)
}
}
// Now remove relevant subs from the list
for _, sub := range subsToRemove {
mgr.Remove(projectUUID, sub)
}
return nil
}
// Push method of pusher object to consume and push messages
func (p *Pusher) push(brk brokers.Broker, store stores.Store) {
log.Debug("pid ", p.id, "pushing")
// update sub details
subs, err := subscriptions.Find(p.sub.ProjectUUID, "", p.sub.Name, "", 0, store)
// If subscription doesn't exist in store stop and remove it from manager
if err == nil && len(subs.Subscriptions) == 0 {
p.stop <- 1
return
}
p.sub = subs.Subscriptions[0]
// Init Received Message List
fullTopic := p.sub.ProjectUUID + "." + p.sub.Topic
msgs, err := brk.Consume(context.Background(), fullTopic, p.sub.Offset, true, 1)
if err != nil {
// If tracked offset is off, update it to the latest min offset
if err == brokers.ErrOffsetOff {
// Get Current Min Offset and advanced tracked one
p.sub.Offset = brk.GetMinOffset(fullTopic)
msgs, err = brk.Consume(context.Background(), fullTopic, p.sub.Offset, true, 1)
if err != nil {
log.Error("Unable to consume after updating offset")
return
}
}
}
if len(msgs) > 0 {
// Generate push message template
pMsg := messages.PushMsg{}
pMsg.Msg, _ = messages.LoadMsgJSON([]byte(msgs[0]))
pMsg.Sub = p.sub.FullName
pMsgJSON, _ := pMsg.ExportJSON()
err := p.sndr.Send(pMsgJSON, p.endpoint)
if err == nil {
// Advance the offset
store.UpdateSubOffset(p.sub.ProjectUUID, p.sub.Name, 1+p.sub.Offset)
// Update subscription's metrics
store.IncrementSubMsgNum(p.sub.ProjectUUID, p.sub.Name, int64(1))
store.IncrementSubBytes(p.sub.ProjectUUID, p.sub.Name, pMsg.Msg.Size())
log.Debug("offset updated")
}
} else {
log.Debug("pid: ", p.id, " empty")
}
}
// PrintAll prints manager stats
func (mgr *Manager) PrintAll() {
for k := range mgr.list {
item := mgr.list[k]
log.Debug("--- pid: ", item.id, " running: ", item.running)
}
}
// NewManager creates a new manager object for managing push routines
func NewManager(brk brokers.Broker, str stores.Store, sndr Sender) *Manager {
mgr := Manager{}
mgr.broker = brk
mgr.store = str
mgr.sender = sndr
mgr.list = make(map[string]*Pusher)
log.Info("PUSH", "\t", "Manager Initialized")
return &mgr
}
func splitPSub(psub string) (string, string, error) {
tokens := strings.Split(psub, "/")
if len(tokens) != 2 {
return "", "", errors.New("Wrong project/subscription definition")
}
return tokens[0], tokens[1], nil
}
// isSet returns true if broker and store has been set
func (mgr *Manager) isSet() bool {
if mgr.broker != nil && mgr.store != nil {
return true
}
return false
}
// Get returns a pusher
func (mgr *Manager) Get(psub string) (*Pusher, error) {
if p, ok := mgr.list[psub]; ok {
return p, nil
}
return nil, errors.New("not found")
}
// Remove a push subscription
func (mgr *Manager) Remove(project string, sub string) error {
// Check if mgr is set
if !mgr.isSet() {
return errors.New("Push Manager not set")
}
if _, err := mgr.Get(project + "/" + sub); err == nil {
delete(mgr.list, project+"/"+sub)
return nil
}
return errors.New("not Found")
}
// Restart a push subscription
func (mgr *Manager) Restart(project string, sub string) error {
// Check if mgr is set
if !mgr.isSet() {
return errors.New("Push Manager not set")
}
if p, err := mgr.Get(project + "/" + sub); err == nil {
if p.running == false {
log.Debug("Already stopped", p.id, "state:", p.running)
return errors.New("Already Stoped")
}
log.Debug("Trying to Restart:", p.id)
p.stop <- 2
return nil
}
return errors.New("not Found")
}
// Stop stops a push subscription
func (mgr *Manager) Stop(project string, sub string) error {
// Check if mgr is set
if !mgr.isSet() {
return errors.New("Push Manager not set")
}
if p, err := mgr.Get(project + "/" + sub); err == nil {
if p.running == false {
log.Debug("Already stopped", p.id, " state:", p.running)
return errors.New("Already Stoped")
}
log.Debug("Trying to stop:", p.id)
p.stop <- 1
return nil
}
return errors.New("not Found")
}
// Refresh updates the subscription information from the database
func (mgr *Manager) Refresh(projectUUID string, sub string) error {
// Check if mgr is set
if !mgr.isSet() {
return errors.New("Push Manager not set")
}
if p, err := mgr.Get(projectUUID + "/" + sub); err == nil {
subs, err := subscriptions.Find(projectUUID, "", sub, "", 0, mgr.store)
if err != nil {
return errors.New("backend error")
}
if subs.Empty() {
return errors.New("Not Found")
}
p.endpoint = subs.Subscriptions[0].PushCfg.Pend
p.retryPolicy = subs.Subscriptions[0].PushCfg.RetPol.PolicyType
p.retryPeriod = subs.Subscriptions[0].PushCfg.RetPol.Period
p.rate = time.Duration(p.retryPeriod) * time.Millisecond
}
return errors.New("not Found")
}
// Add a new push subscription
func (mgr *Manager) Add(projectUUID string, subName string) error {
// Check if mgr is set
if !mgr.isSet() {
return errors.New("Push Manager not set")
}
// Check if subscription exists
subs, err := subscriptions.Find(projectUUID, "", subName, "", 0, mgr.store)
if err != nil {
return errors.New("Backend error")
}
if subs.Empty() {
return errors.New("not found")
}
// Create new pusher
pushr := Pusher{}
pushr.id = len(mgr.list)
pushr.sub = subs.Subscriptions[0]
pushr.endpoint = subs.Subscriptions[0].PushCfg.Pend
pushr.running = false
pushr.stop = make(chan int, 2)
pushr.retryPolicy = subs.Subscriptions[0].PushCfg.RetPol.PolicyType
pushr.retryPeriod = subs.Subscriptions[0].PushCfg.RetPol.Period
pushr.rate = time.Duration(pushr.retryPeriod) * time.Millisecond
pushr.sndr = mgr.sender
pushr.mgr = mgr
mgr.list[projectUUID+"/"+subName] = &pushr
log.Info("PUSH", "\t", "Push Subscription Added")
return nil
}
// Launch Launches a new puhser
func (mgr *Manager) Launch(project string, sub string) error {
// Check if mgr is set
if !mgr.isSet() {
return errors.New("Push Manager not set")
}
mgr.Refresh(project, sub)
psub := project + "/" + sub
if p, err := mgr.Get(psub); err == nil {
if p.running == true {
return errors.New("Already Running")
}
p.launch(mgr.broker, mgr.store.Clone())
return nil
} else {
log.Error(err.Error())
}
return errors.New("not Found")
}
// Launch the pusher activity
func (p *Pusher) launch(brk brokers.Broker, store stores.Store) {
log.Info("PUSH", "\t", "pusher: ", p.id, " launching...")
p.running = true
if p.retryPolicy == "linear" {
go LinearActivity(p, brk, store)
}
}
//LinearActivity implements a linear retry push
func LinearActivity(p *Pusher, brk brokers.Broker, store stores.Store) error {
defer store.Close()
for {
rate := time.After(p.rate)
select {
case halt := <-p.stop:
{
log.Info("PUSH", "\t", "pusher: ", p.id, " stoping...")
p.running = false
if halt == 2 {
p.mgr.Launch(p.sub.ProjectUUID, p.sub.Name)
} else {
p.mgr.Remove(p.sub.ProjectUUID, p.sub.Name)
}
return nil
}
case <-rate:
{
p.push(brk, store)
}
}
}
}