/
snapshot_updater.go
123 lines (104 loc) · 3.77 KB
/
snapshot_updater.go
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// Copyright (c) 2016-2018, Jan Cajthaml <jan.cajthaml@gmail.com>
//
// 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 daemon
import (
"context"
"strconv"
"time"
"github.com/jancajthaml-openbank/vault/config"
"github.com/jancajthaml-openbank/vault/model"
"github.com/jancajthaml-openbank/vault/utils"
system "github.com/jancajthaml-openbank/actor-system"
log "github.com/sirupsen/logrus"
)
// SnapshotUpdater represents journal saturation update subroutine
type SnapshotUpdater struct {
Support
callback func(msg interface{}, to system.Coordinates, from system.Coordinates)
metrics *Metrics
storage string
scanInterval time.Duration
saturationThreshold int
}
// NewSnapshotUpdater returns snapshot updater fascade
func NewSnapshotUpdater(ctx context.Context, cfg config.Configuration, metrics *Metrics, callback func(msg interface{}, to system.Coordinates, from system.Coordinates)) SnapshotUpdater {
return SnapshotUpdater{
Support: NewDaemonSupport(ctx),
callback: callback,
metrics: metrics,
storage: cfg.RootStorage,
scanInterval: cfg.SnapshotScanInterval,
saturationThreshold: cfg.JournalSaturation,
}
}
// FIXME unit test coverage
// FIXME maximum events to params
func (updater SnapshotUpdater) updateSaturated() {
accounts := updater.getAccounts()
var numberOfSnapshotsUpdated int64
for _, name := range accounts {
version := updater.getVersion(name)
if version == -1 {
continue
}
if updater.getEvents(name, version) >= updater.saturationThreshold {
log.Debugf("Request %v to update snapshot version from %d to %d", name, version, version+1)
msg := model.Update{Version: version}
to := system.Coordinates{Name: name}
from := system.Coordinates{Name: "snapshot_saturation_cron"}
updater.callback(msg, to, from)
numberOfSnapshotsUpdated++
}
}
updater.metrics.SnapshotsUpdated(numberOfSnapshotsUpdated)
}
func (updater SnapshotUpdater) getAccounts() []string {
return utils.ListDirectory(utils.RootPath(updater.storage), true)
}
func (updater SnapshotUpdater) getVersion(name string) int {
versions := utils.ListDirectory(utils.SnapshotsPath(updater.storage, name), false)
if len(versions) == 0 {
return -1
}
version, err := strconv.Atoi(versions[0])
if err != nil {
return -1
}
return version
}
func (updater SnapshotUpdater) getEvents(name string, version int) int {
return utils.CountFiles(utils.EventPath(updater.storage, name, version))
}
// Start handles everything needed to start snapshot updater daemon it runs scan
// of accounts snapshots and events and orders accounts to update their snapshot
// if number of events in given version is larger than threshold
func (updater SnapshotUpdater) Start() {
defer updater.MarkDone()
ticker := time.NewTicker(updater.scanInterval)
defer ticker.Stop()
log.Infof("Start snapshot updater daemon, scan each %v and update journals with at least %d events", updater.scanInterval, updater.saturationThreshold)
updater.MarkReady()
for {
select {
case <-updater.Done():
log.Info("Stopping snapshot updater daemon")
log.Info("Stop snapshot updater daemon")
return
case <-ticker.C:
updater.metrics.TimeUpdateSaturatedSnapshots(func() {
updater.updateSaturated()
})
}
}
}