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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 (
"time"
api "github.com/capsule8/capsule8/api/v0"
"github.com/capsule8/capsule8/pkg/stream"
)
type ticker struct {
ctrl chan interface{}
data chan interface{}
sensor *Sensor
filter *api.TickerEventFilter
duration time.Duration
ticker *stream.Stream
}
func (t *ticker) newTickerEvent(tick time.Time) *api.Event {
e := t.sensor.NewEvent()
e.Event = &api.Event_Ticker{
Ticker: &api.TickerEvent{
Seconds: tick.Unix(),
Nanoseconds: tick.UnixNano(),
},
}
return e
}
func newTickerSource(sensor *Sensor, filter *api.TickerEventFilter) (*stream.Stream, error) {
// Each call to New creates a new session with the Sensor. It is the
// Sensor's responsibility to handle all of its sessions in the most
// high-performance way possible. For example, a Sensor may install
// kernel probes for the union of all sessions, but then demux the
// results through individual goroutines forwarding events over
// their own channels.
duration := time.Duration(filter.Interval)
t := &ticker{
ctrl: make(chan interface{}),
data: make(chan interface{}),
sensor: sensor,
filter: filter,
duration: duration,
ticker: stream.Ticker(duration),
}
go func() {
for {
select {
case _, ok := <-t.ctrl:
if !ok {
close(t.data)
return
}
case e, ok := <-t.ticker.Data:
if ok {
tick := e.(time.Time)
ev := t.newTickerEvent(tick)
t.data <- ev
} else {
return
}
}
}
}()
return &stream.Stream{
Ctrl: t.ctrl,
Data: t.data,
}, nil
}