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iter.go
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iter.go
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/*
Copyright (c) 2016, Percona LLC and/or its affiliates. All rights reserved.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>
*/
package perfschema
import (
"time"
"github.com/percona/qan-agent/pct"
"github.com/percona/qan-agent/qan/analyzer/mysql/iter"
)
type Iter struct {
logger *pct.Logger
tickChan chan time.Time
// --
intervalChan chan *iter.Interval
sync *pct.SyncChan
}
func NewIter(logger *pct.Logger, tickChan chan time.Time) *Iter {
return &Iter{
logger: logger,
tickChan: tickChan,
// --
intervalChan: make(chan *iter.Interval, 1),
sync: pct.NewSyncChan(),
}
}
func (i *Iter) Start() {
go i.run()
}
func (i *Iter) Stop() {
i.sync.Stop()
i.sync.Wait()
return
}
func (i *Iter) IntervalChan() chan *iter.Interval {
return i.intervalChan
}
func (i *Iter) TickChan() chan time.Time {
return i.tickChan
}
// --------------------------------------------------------------------------
func (i *Iter) run() {
defer func() {
if err := recover(); err != nil {
i.logger.Error("QAN performance schema iterator crashed: ", err)
}
i.sync.Done()
}()
prev := time.Time{}
n := 0
for {
i.logger.Debug("run:wait")
select {
case now := <-i.tickChan:
i.logger.Debug("run:tick")
n++
iter := &iter.Interval{
Number: n,
StartTime: prev,
StopTime: now,
}
select {
case i.intervalChan <- iter:
case <-time.After(1 * time.Second):
i.logger.Warn("Lost interval: ", iter)
}
prev = now
case <-i.sync.StopChan:
i.logger.Debug("run:stop")
return
}
}
}