forked from skiptomyliu/capsule8
/
ticker.go
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/
ticker.go
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// Copyright 2017 Capsule8, Inc.
//
// 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 sensor
import (
"fmt"
"time"
"github.com/Happyholic1203/capsule8/pkg/expression"
)
// TickerEventTypes defines the field types that can be used with filters on
// ticker telemetry events.
var TickerEventTypes = expression.FieldTypeMap{
"seconds": expression.ValueTypeSignedInt64,
"nanoseconds": expression.ValueTypeSignedInt64,
}
// TickerTelemetryEvent is a telemetry event generated by the ticker event
// source.
type TickerTelemetryEvent struct {
TelemetryEventData
Seconds int64
Nanoseconds int64
}
// CommonTelemetryEventData returns the telemtry event data common to all
// telemetry events for a chargen telemetry event.
func (e TickerTelemetryEvent) CommonTelemetryEventData() TelemetryEventData {
return e.TelemetryEventData
}
func (s *Subscription) dispatchTickerEvent(
eventid uint64,
data expression.FieldValueMap,
) {
var e TickerTelemetryEvent
e.Init(s.sensor)
e.Seconds = data["seconds"].(int64)
e.Nanoseconds = data["nanoseconds"].(int64)
s.DispatchEvent(eventid, e, data)
}
// RegisterTickerEventFilter registers a ticker event filter with a
// subscription.
func (s *Subscription) RegisterTickerEventFilter(
interval int64,
filter *expression.Expression,
) {
if interval <= 0 {
s.logStatus(
fmt.Sprintf("Invalid ticker interval: %d", interval))
return
}
monitor := s.sensor.Monitor()
eventID := monitor.ReserveEventID()
done := make(chan struct{})
es, err := s.addEventSink(eventID, filter)
if err != nil {
s.logStatus(
fmt.Sprintf("Invalid filter expression for ticker filter: %v", err))
return
}
es.unregister = func(es *eventSink) {
close(done)
}
es.enable = func() {
go func() {
ticker := time.NewTicker(time.Duration(interval))
for {
select {
case <-done:
ticker.Stop()
return
case <-ticker.C:
now := time.Now()
data := expression.FieldValueMap{
"seconds": int64(now.Unix()),
"nanoseconds": int64(now.UnixNano()),
}
s.dispatchTickerEvent(eventID, data)
}
}
}()
}
}