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filter_sink.go
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/
filter_sink.go
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/*
* Copyright 2017 Google 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 nozzle
import (
"errors"
"github.com/cloudfoundry-community/stackdriver-tools/src/stackdriver-nozzle/telemetry"
"github.com/cloudfoundry/sonde-go/events"
)
var (
blacklistedEvents *telemetry.Counter
whitelistedEvents *telemetry.Counter
)
func init() {
blacklistedEvents = telemetry.NewCounter(telemetry.Nozzle, "filter_sink.blacklisted_events")
whitelistedEvents = telemetry.NewCounter(telemetry.Nozzle, "filter_sink.whitelisted_events")
}
type filter struct {
enabled map[events.Envelope_EventType]bool
blacklist, whitelist *EventFilter
destination Sink
}
func NewFilterSink(eventNames []events.Envelope_EventType, blacklist, whitelist *EventFilter, destination Sink) (Sink, error) {
if destination == nil {
return nil, errors.New("missing destinationSink")
}
f := &filter{
enabled: make(map[events.Envelope_EventType]bool),
blacklist: blacklist,
whitelist: whitelist,
destination: destination,
}
for _, eventType := range eventNames {
f.enabled[eventType] = true
}
return f, nil
}
func (fs *filter) isBlacklisted(event *events.Envelope) bool {
if fs.blacklist.Match(event) {
if fs.whitelist.Match(event) {
whitelistedEvents.Increment()
return false
}
blacklistedEvents.Increment()
return true
}
return false
}
func (fs *filter) Receive(event *events.Envelope) {
if !fs.enabled[event.GetEventType()] || fs.isBlacklisted(event) {
return
}
fs.destination.Receive(event)
}