2 ==================================================================================
3 Copyright (c) 2019 AT&T Intellectual Property.
4 Copyright (c) 2019 Nokia
6 Licensed under the Apache License, Version 2.0 (the "License");
7 you may not use this file except in compliance with the License.
8 You may obtain a copy of the License at
10 http://www.apache.org/licenses/LICENSE-2.0
12 Unless required by applicable law or agreed to in writing, software
13 distributed under the License is distributed on an "AS IS" BASIS,
14 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 See the License for the specific language governing permissions and
16 limitations under the License.
17 ==================================================================================
25 "github.com/segmentio/ksuid"
30 func (sd *SubscriptionDispatcher) Initialize() {
31 sd.client = &http.Client{}
35 sd.subscriptions = sd.db.RestoreSubscriptions()
38 func (sd *SubscriptionDispatcher) Add(sr SubscriptionReq) (resp SubscriptionResp) {
39 key := ksuid.New().String()
40 resp = SubscriptionResp{key, 0, sr.EventType}
43 sd.subscriptions.Set(key, Subscription{sr, resp})
44 sd.db.StoreSubscriptions(sd.subscriptions)
46 Logger.Info("Sub: New subscription added: key=%s value=%v", key, sr)
50 func (sd *SubscriptionDispatcher) GetAll() (hooks []SubscriptionReq) {
51 hooks = []SubscriptionReq{}
52 for v := range sd.subscriptions.IterBuffered() {
53 hooks = append(hooks, v.Val.(Subscription).req)
59 func (sd *SubscriptionDispatcher) Get(id string) (SubscriptionReq, bool) {
60 if v, found := sd.subscriptions.Get(id); found {
61 Logger.Info("Subscription id=%s found: %v", id, v.(Subscription).req)
63 return v.(Subscription).req, found
65 return SubscriptionReq{}, false
68 func (sd *SubscriptionDispatcher) Delete(id string) (SubscriptionReq, bool) {
69 if v, found := sd.subscriptions.Get(id); found {
70 Logger.Info("Subscription id=%s found: %v ... deleting", id, v.(Subscription).req)
72 sd.subscriptions.Remove(id)
73 sd.db.StoreSubscriptions(sd.subscriptions)
75 return v.(Subscription).req, found
77 return SubscriptionReq{}, false
80 func (sd *SubscriptionDispatcher) Update(id string, sr SubscriptionReq) (SubscriptionReq, bool) {
81 if s, found := sd.subscriptions.Get(id); found {
82 Logger.Info("Subscription id=%s found: %v ... updating", id, s.(Subscription).req)
85 sd.subscriptions.Set(id, Subscription{sr, s.(Subscription).resp})
86 sd.db.StoreSubscriptions(sd.subscriptions)
90 return SubscriptionReq{}, false
93 func (sd *SubscriptionDispatcher) Publish(x Xapp, et EventType) {
94 sd.notifyClients([]Xapp{x}, et)
97 func (sd *SubscriptionDispatcher) notifyClients(xapps []Xapp, et EventType) {
98 if len(xapps) == 0 || len(sd.subscriptions) == 0 {
99 Logger.Info("Nothing to publish [%d:%d]", len(xapps), len(sd.subscriptions))
104 for v := range sd.subscriptions.Iter() {
105 go sd.notify(xapps, et, v.Val.(Subscription), sd.Seq)
109 func (sd *SubscriptionDispatcher) notify(xapps []Xapp, et EventType, s Subscription, seq int) error {
110 notif := []SubscriptionNotif{}
111 notif = append(notif, SubscriptionNotif{Id: s.req.Id, Version: seq, EventType: string(et), XappData: xapps})
113 jsonData, err := json.Marshal(notif)
115 Logger.Info("json.Marshal failed: %v", err)
119 // Execute the request with retry policy
120 return sd.retry(s, func() error {
121 resp, err := http.Post(s.req.TargetUrl, "application/json", bytes.NewBuffer(jsonData))
123 Logger.Info("Posting to subscription failed: %v", err)
127 if resp.StatusCode != http.StatusOK {
128 Logger.Info("Client returned error code: %d", resp.StatusCode)
132 Logger.Info("subscription to '%s' dispatched, response code: %d", s.req.TargetUrl, resp.StatusCode)
137 func (sd *SubscriptionDispatcher) retry(s Subscription, fn func() error) error {
138 if err := fn(); err != nil {
139 // Todo: use exponential backoff, or similar mechanism
140 if s.req.MaxRetries--; s.req.MaxRetries > 0 {
141 time.Sleep(time.Duration(s.req.RetryTimer) * time.Second)
142 return sd.retry(s, fn)
144 sd.subscriptions.Remove(s.req.Id)