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/*
* 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 agent
import (
"fmt"
"time"
"github.com/iotbzh/xds-agent/lib/xaapiv1"
)
// 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 xaapiv1.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 xaapiv1.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 := xaapiv1.EVTAllList
if evName != xaapiv1.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 unregister event(s)
func (e *Events) UnRegister(evName, sessionID string) error {
evs := xaapiv1.EVTAllList
if evName != xaapiv1.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")
}
if e.LogLevelSilly {
e.Log.Debugf("Emit Event %s: %v", evName, data)
}
firstErr = nil
evm := e.eventsMap[evName]
for sid := range evm.sids {
so := e.webServer.sessions.IOSocketGet(sid)
if so == nil {
if firstErr == nil {
firstErr = fmt.Errorf("IOSocketGet return nil (SID=%v)", sid)
}
continue
}
msg := xaapiv1.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
}
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