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nozzle.go
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nozzle.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"
"sync"
"code.cloudfoundry.org/go-diodes"
"code.cloudfoundry.org/lager"
"github.com/cloudfoundry-community/stackdriver-tools/src/stackdriver-nozzle/cloudfoundry"
"github.com/cloudfoundry-community/stackdriver-tools/src/stackdriver-nozzle/telemetry"
"github.com/cloudfoundry/noaa/consumer"
"github.com/cloudfoundry/sonde-go/events"
"github.com/gorilla/websocket"
)
const bufferSize = 30000 // 1k messages/second * 30 seconds
type Nozzle interface {
Start(rlp cloudfoundry.ReverseLogProxy)
Stop() error
}
var (
firehoseErrs *telemetry.CounterMap
firehoseErrEmpty *telemetry.Counter
firehoseErrUnknown *telemetry.Counter
firehoseErrCloseNormal *telemetry.Counter
firehoseErrClosePolicyViolation *telemetry.Counter
firehoseErrCloseUnknown *telemetry.Counter
firehoseEventsTotal *telemetry.Counter
firehoseEventsDropped *telemetry.Counter
firehoseEventsReceived *telemetry.Counter
)
func init() {
firehoseErrs = telemetry.NewCounterMap(telemetry.Nozzle, "firehose.errors", "error_type")
firehoseErrEmpty = firehoseErrs.MustCounter("empty")
firehoseErrUnknown = firehoseErrs.MustCounter("unknown")
firehoseErrCloseNormal = firehoseErrs.MustCounter("close_normal_closure")
firehoseErrClosePolicyViolation = firehoseErrs.MustCounter("close_policy_violation")
firehoseErrCloseUnknown = firehoseErrs.MustCounter("close_unknown")
firehoseEventsTotal = telemetry.NewCounter(telemetry.Nozzle, "firehose_events.total")
firehoseEventsDropped = telemetry.NewCounter(telemetry.Nozzle, "firehose_events.dropped")
firehoseEventsReceived = telemetry.NewCounter(telemetry.Nozzle, "firehose_events.received")
}
type nozzle struct {
sinks []Sink
logger lager.Logger
session state
}
type state struct {
sync.Mutex
done chan struct{}
running bool
}
func NewNozzle(logger lager.Logger, sinks ...Sink) Nozzle {
return &nozzle{
sinks: sinks,
logger: logger,
}
}
func (n *nozzle) Start(rlp cloudfoundry.ReverseLogProxy) {
n.session = state{done: make(chan struct{}), running: true}
messages, fhErrInternal := rlp.Connect()
// Drain and report errors from firehose
go func() {
for err := range fhErrInternal {
if err == nil {
// Ignore empty errors. Customers observe a flooding of empty errors from firehose.
firehoseErrEmpty.Increment()
continue
}
go n.handleFirehoseError(err)
}
}()
buffer := diodes.NewPoller(diodes.NewOneToOne(bufferSize, diodes.AlertFunc(func(missed int) {
firehoseEventsDropped.Add(int64(missed))
firehoseEventsTotal.Add(int64(missed))
})))
// Drain messages from the firehose and place them into the ring buffer
go func() {
for {
select {
case envelope := <-messages:
buffer.Set(diodes.GenericDataType(envelope))
case <-n.session.done:
return
}
}
}()
// Drain the ring buffer of firehose events to send through the nozzle
go func() {
for {
unsafeEvent := buffer.Next()
if unsafeEvent != nil {
var event = (*events.Envelope)(unsafeEvent)
n.handleEvent(event)
}
}
}()
}
func (n *nozzle) Stop() error {
n.session.Lock()
defer n.session.Unlock()
if !n.session.running {
return errors.New("nozzle is not running")
}
close(n.session.done)
n.session.running = false
return nil
}
func (n *nozzle) handleEvent(envelope *events.Envelope) {
firehoseEventsReceived.Increment()
firehoseEventsTotal.Increment()
for _, sink := range n.sinks {
sink.Receive(envelope)
}
}
func (n *nozzle) handleFirehoseError(err error) {
if err == consumer.ErrMaxRetriesReached {
n.logger.Fatal("firehose", err)
} else {
n.logger.Error("firehose", err)
}
closeErr, ok := err.(*websocket.CloseError)
if !ok {
firehoseErrUnknown.Increment()
return
}
switch closeErr.Code {
case websocket.CloseNormalClosure:
firehoseErrCloseNormal.Increment()
case websocket.ClosePolicyViolation:
firehoseErrClosePolicyViolation.Increment()
default:
firehoseErrCloseUnknown.Increment()
}
}