87 lines
2.4 KiB
Go
87 lines
2.4 KiB
Go
// VulcanizeDB
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// Copyright © 2022 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package gracefulshutdown
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import (
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"context"
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"fmt"
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"os"
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"os/signal"
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"sync"
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"syscall"
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"time"
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log "github.com/sirupsen/logrus"
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"github.com/vulcanize/ipld-eth-beacon-indexer/pkg/loghelper"
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)
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// operation is a clean up function on shutting down
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type Operation func(ctx context.Context) error
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var (
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TimeoutErr = func(timeout string) error {
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return fmt.Errorf("The Timeout %s, has been elapsed, the application will forcefully exit", timeout)
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}
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)
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// gracefulShutdown waits for termination syscalls and doing clean up operations after received it
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func Shutdown(ctx context.Context, notifierCh chan os.Signal, timeout time.Duration, ops map[string]Operation) (<-chan struct{}, <-chan error) {
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waitCh := make(chan struct{})
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errCh := make(chan error)
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go func() {
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// add any other syscalls that you want to be notified with
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signal.Notify(notifierCh, syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP)
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<-notifierCh
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log.Info("Shutting Down your application")
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// set timeout for the ops to be done to prevent system hang
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timeoutFunc := time.AfterFunc(timeout, func() {
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log.Warnf(TimeoutErr(timeout.String()).Error())
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errCh <- TimeoutErr(timeout.String())
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})
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defer timeoutFunc.Stop()
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var wg sync.WaitGroup
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// Do the operations asynchronously to save time
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for key, op := range ops {
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wg.Add(1)
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innerOp := op
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innerKey := key
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go func() {
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defer wg.Done()
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log.Infof("cleaning up: %s", innerKey)
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if err := innerOp(ctx); err != nil {
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loghelper.LogError(err).Errorf("%s: clean up failed: %s", innerKey, err.Error())
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return
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}
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log.Infof("%s was shutdown gracefully", innerKey)
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}()
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}
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wg.Wait()
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close(waitCh)
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}()
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return waitCh, errCh
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}
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