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intercept.go
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/
intercept.go
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// Copyright 2020 Douyu
//
// 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 xcron
import (
"sync"
"time"
"github.com/douyu/jupiter/pkg/xlog"
"github.com/robfig/cron/v3"
)
// delayIfStillRunning serializes jobs, delaying subsequent runs until the
// previous one is complete. Jobs running after a delay of more than a minute
// have the delay logged at Info.
func delayIfStillRunning(logger *xlog.Logger) JobWrapper {
return func(j Job) Job {
var mu sync.Mutex
return cron.FuncJob(func() {
start := time.Now()
mu.Lock()
defer mu.Unlock()
if dur := time.Since(start); dur > time.Minute {
logger.Info("cron delay", xlog.String("duration", dur.String()))
}
j.Run()
})
}
}
// skipIfStillRunning skips an invocation of the Job if a previous invocation is
// still running. It logs skips to the given logger at Info level.
func skipIfStillRunning(logger *xlog.Logger) JobWrapper {
var ch = make(chan struct{}, 1)
ch <- struct{}{}
return func(j Job) Job {
return cron.FuncJob(func() {
select {
case v := <-ch:
j.Run()
ch <- v
default:
logger.Info("cron skip")
}
})
}
}