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-rw-r--r--lib/xdsserver/events.go125
1 files changed, 125 insertions, 0 deletions
diff --git a/lib/xdsserver/events.go b/lib/xdsserver/events.go
new file mode 100644
index 0000000..007b89a
--- /dev/null
+++ b/lib/xdsserver/events.go
@@ -0,0 +1,125 @@
+/*
+ * Copyright (C) 2017 "IoT.bzh"
+ * Author Sebastien Douheret <sebastien@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package xdsserver
+
+import (
+ "fmt"
+ "time"
+
+ "github.com/iotbzh/xds-server/lib/xsapiv1"
+)
+
+// EventDef Definition on one event
+type EventDef struct {
+ sids map[string]int
+}
+
+// Events Hold registered events per context
+type Events struct {
+ *Context
+ eventsMap map[string]*EventDef
+}
+
+// NewEvents creates an instance of Events
+func NewEvents(ctx *Context) *Events {
+ evMap := make(map[string]*EventDef)
+ for _, ev := range xsapiv1.EVTAllList {
+ evMap[ev] = &EventDef{
+ sids: make(map[string]int),
+ }
+ }
+ return &Events{
+ Context: ctx,
+ eventsMap: evMap,
+ }
+}
+
+// GetList returns the list of all supported events
+func (e *Events) GetList() []string {
+ return xsapiv1.EVTAllList
+}
+
+// Register Used by a client/session to register to a specific (or all) event(s)
+func (e *Events) Register(evName, sessionID string) error {
+ evs := xsapiv1.EVTAllList
+ if evName != xsapiv1.EVTAll {
+ if _, ok := e.eventsMap[evName]; !ok {
+ return fmt.Errorf("Unsupported event type name")
+ }
+ evs = []string{evName}
+ }
+ for _, ev := range evs {
+ e.eventsMap[ev].sids[sessionID]++
+ }
+ return nil
+}
+
+// UnRegister Used by a client/session to un-register event(s)
+func (e *Events) UnRegister(evName, sessionID string) error {
+ evs := xsapiv1.EVTAllList
+ if evName != xsapiv1.EVTAll {
+ if _, ok := e.eventsMap[evName]; !ok {
+ return fmt.Errorf("Unsupported event type name")
+ }
+ evs = []string{evName}
+ }
+ for _, ev := range evs {
+ if _, exist := e.eventsMap[ev].sids[sessionID]; exist {
+ delete(e.eventsMap[ev].sids, sessionID)
+ break
+ }
+ }
+ return nil
+}
+
+// Emit Used to manually emit an event
+func (e *Events) Emit(evName string, data interface{}, fromSid string) error {
+ var firstErr error
+
+ if _, ok := e.eventsMap[evName]; !ok {
+ return fmt.Errorf("Unsupported event type")
+ }
+
+ firstErr = nil
+ evm := e.eventsMap[evName]
+ e.LogSillyf("Emit Event %s: len(sids)=%d, data=%v", evName, len(evm.sids), data)
+ for sid := range evm.sids {
+ so := e.sessions.IOSocketGet(sid)
+ if so == nil {
+ if firstErr == nil {
+ firstErr = fmt.Errorf("IOSocketGet return nil (SID=%v)", sid)
+ }
+ continue
+ }
+ msg := xsapiv1.EventMsg{
+ Time: time.Now().String(),
+ FromSessionID: fromSid,
+ Type: evName,
+ Data: data,
+ }
+ e.Log.Debugf("Emit Event %s: %v", evName, sid)
+ if err := (*so).Emit(evName, msg); err != nil {
+ e.Log.Errorf("WS Emit %v error : %v", evName, err)
+ if firstErr == nil {
+ firstErr = err
+ }
+ }
+ }
+
+ return firstErr
+}