/*
* Copyright (c) 2014,2019 by Farsight Security, 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.
*/
//go:generate ./genproto.sh
package dnstap
const outputChannelSize = 32
// FSContentType is the FrameStream content type for dnstap protobuf data.
var FSContentType = []byte("protobuf:dnstap.Dnstap")
// An Input is a source of dnstap data. It provides validation of the
// content type and will present any data read or received on the channel
// provided to the ReadInto method.
type Input interface {
ReadInto(chan []byte)
Wait()
}
// An Output is a destination for dnstap data. It accepts data on the channel
// returned from the GetOutputChannel method. The RunOutputLoop() method
// processes data received on this channel, and returns after the Close()
// method is called.
type Output interface {
GetOutputChannel() chan []byte
RunOutputLoop()
Close()
}
// A Logger prints a formatted log message to the destination of the
// implementation's choice. A Logger may be provided for some Input and
// Output implementations for visibility into their ReadInto() and
// RunOutputLoop() loops.
//
// The result of log.New() satisfies the Logger interface.
type Logger interface {
Printf(format string, v ...interface{})
}
type nullLogger struct{}
func (n nullLogger) Printf(format string, v ...interface{}) {}