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async_calc_graph.go
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async_calc_graph.go
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// Copyright (c) 2016-2017 Tigera, Inc. All rights reserved.
//
// 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 calc
import (
"reflect"
"time"
log "github.com/Sirupsen/logrus"
"github.com/prometheus/client_golang/prometheus"
"github.com/gavv/monotime"
"github.com/projectcalico/felix/config"
"github.com/projectcalico/felix/dispatcher"
"github.com/projectcalico/felix/proto"
"github.com/projectcalico/libcalico-go/lib/backend/api"
)
const (
tickInterval = 10 * time.Millisecond
leakyBucketSize = 10
)
var (
dataplaneStatusGauge = prometheus.NewGauge(prometheus.GaugeOpts{
Name: "felix_resync_state",
Help: "Current datastore state.",
})
resyncsStarted = prometheus.NewCounter(prometheus.CounterOpts{
Name: "felix_resyncs_started",
Help: "Current datastore state.",
})
statusToGaugeValue = map[api.SyncStatus]float64{
api.WaitForDatastore: 1,
api.ResyncInProgress: 2,
api.InSync: 3,
}
countUpdatesProcessed = prometheus.NewCounterVec(prometheus.CounterOpts{
Name: "felix_calc_graph_updates_processed",
Help: "Number of datastore updates processed by the calculation graph.",
}, []string{"type"})
countOutputEvents = prometheus.NewCounter(prometheus.CounterOpts{
Name: "felix_calc_graph_output_events",
Help: "Number of events emitted by the calculation graph.",
})
summaryUpdateTime = prometheus.NewSummary(prometheus.SummaryOpts{
Name: "felix_calc_graph_update_time_seconds",
Help: "Seconds to update calculation graph for each datastore OnUpdate call.",
})
)
func init() {
prometheus.MustRegister(dataplaneStatusGauge)
prometheus.MustRegister(resyncsStarted)
prometheus.MustRegister(countUpdatesProcessed)
prometheus.MustRegister(countOutputEvents)
prometheus.MustRegister(summaryUpdateTime)
}
type AsyncCalcGraph struct {
Dispatcher *dispatcher.Dispatcher
inputEvents chan interface{}
outputEvents chan<- interface{}
eventBuffer *EventSequencer
beenInSync bool
needToSendInSync bool
flushTicks <-chan time.Time
flushLeakyBucket int
dirty bool
}
func NewAsyncCalcGraph(conf *config.Config, outputEvents chan<- interface{}) *AsyncCalcGraph {
eventBuffer := NewEventBuffer(conf)
disp := NewCalculationGraph(eventBuffer, conf.FelixHostname)
g := &AsyncCalcGraph{
inputEvents: make(chan interface{}, 10),
outputEvents: outputEvents,
Dispatcher: disp,
eventBuffer: eventBuffer,
}
eventBuffer.Callback = g.onEvent
return g
}
func (acg *AsyncCalcGraph) OnUpdates(updates []api.Update) {
log.Debugf("Got %v updates; queueing", len(updates))
acg.inputEvents <- updates
}
func (acg *AsyncCalcGraph) OnStatusUpdated(status api.SyncStatus) {
log.Debugf("Status updated: %v; queueing", status)
acg.inputEvents <- status
dataplaneStatusGauge.Set(statusToGaugeValue[status])
if status == api.ResyncInProgress {
resyncsStarted.Inc()
}
}
func (acg *AsyncCalcGraph) loop() {
log.Info("AsyncCalcGraph running")
for {
select {
case update := <-acg.inputEvents:
switch update := update.(type) {
case []api.Update:
// Update; send it to the dispatcher.
log.Debug("Pulled []KVPair off channel")
updStartTime := monotime.Now()
acg.Dispatcher.OnUpdates(update)
updEndTime := monotime.Now()
summaryUpdateTime.Observe((updEndTime - updStartTime).Seconds())
// Record stats for the number of messages processed.
for _, upd := range update {
typeName := reflect.TypeOf(upd.Key).Name()
count := countUpdatesProcessed.WithLabelValues(typeName)
count.Inc()
}
case api.SyncStatus:
// Sync status changed, check if we're now in-sync.
log.WithField("status", update).Debug(
"Pulled status update off channel")
acg.Dispatcher.OnStatusUpdated(update)
if update == api.InSync && !acg.beenInSync {
log.Info("First time we've been in sync")
acg.beenInSync = true
acg.needToSendInSync = true
acg.dirty = true
if acg.flushLeakyBucket == 0 {
// Force a flush.
acg.flushLeakyBucket++
}
}
default:
log.Fatalf("Unexpected update: %#v", update)
}
acg.dirty = true
case <-acg.flushTicks:
// Timer tick: fill up the leaky bucket.
if acg.flushLeakyBucket < leakyBucketSize {
acg.flushLeakyBucket++
}
}
acg.maybeFlush()
}
}
// maybeFlush flushes the event buffer if: we know it's dirty and we're not throttled.
func (acg *AsyncCalcGraph) maybeFlush() {
if !acg.dirty {
return
}
if acg.flushLeakyBucket > 0 {
log.Debug("Not throttled: flushing event buffer")
acg.flushLeakyBucket--
acg.eventBuffer.Flush()
if acg.needToSendInSync {
log.Info("First flush after becoming in sync, sending InSync message.")
acg.onEvent(&proto.InSync{})
acg.needToSendInSync = false
}
acg.dirty = false
} else {
log.Debug("Throttled: not flushing event buffer")
}
}
func (acg *AsyncCalcGraph) onEvent(event interface{}) {
log.Debug("Sending output event on channel")
acg.outputEvents <- event
countOutputEvents.Inc()
log.Debug("Sent output event on channel")
}
func (acg *AsyncCalcGraph) Start() {
log.Info("Starting AsyncCalcGraph")
flushTicker := time.NewTicker(tickInterval)
acg.flushTicks = flushTicker.C
go acg.loop()
}