mirror of
https://github.com/harness/drone.git
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95 lines
2.5 KiB
Go
95 lines
2.5 KiB
Go
// Copyright 2023 Harness, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package cron
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import (
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"context"
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"errors"
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"fmt"
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cron "github.com/robfig/cron/v3"
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"github.com/rs/zerolog/log"
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)
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// Format: seconds minute(0-59) hour(0-23) day of month(1-31) month(1-12) day of week(0-6).
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const (
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Hourly = "0 0 * * * *" // once an hour at minute 0
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Nightly = "0 0 0 * * *" // once a day at midnight
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Weekly = "0 0 0 * * 0" // once a week on Sun midnight
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Monthly = "0 0 0 1 * *" // once a month on the first day of the month
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EverySecond = "* * * * * *" // every second (for testing)
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)
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var ErrFatal = errors.New("fatal error occurred")
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type Manager struct {
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c *cron.Cron
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ctx context.Context
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cancel context.CancelFunc
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fatal chan error
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}
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// NewManager creates a cron manager.
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func NewManager() *Manager {
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return &Manager{
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c: cron.New(cron.WithSeconds()),
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fatal: make(chan error),
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}
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}
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// NewCronTask adds a new func to cron job.
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func (c *Manager) NewCronTask(sepc string, job func(ctx context.Context) error) error {
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_, err := c.c.AddFunc(sepc, func() {
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jerr := job(c.ctx)
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if jerr != nil { // check different severity of errors
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log.Ctx(c.ctx).Error().Err(jerr).Msg("gitrpc cron job failed")
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if errors.Is(jerr, ErrFatal) {
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c.fatal <- jerr
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return
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}
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}
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})
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if err != nil {
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return fmt.Errorf("gitrpc cron manager failed to add cron job function: %w", err)
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}
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return nil
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}
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// Run the cron scheduler, or no-op if already running.
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func (c *Manager) Run(ctx context.Context) error {
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c.ctx, c.cancel = context.WithCancel(ctx)
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var err error
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go func() {
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select {
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case <-ctx.Done():
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err = fmt.Errorf("context done: %w", ctx.Err())
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case fErr := <-c.fatal:
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err = fmt.Errorf("fatal error occurred: %w", fErr)
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}
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// stop scheduling of new jobs.
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// NOTE: doesn't wait for running jobs, but c.Run() does, and we don't have to wait here
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_ = c.c.Stop()
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// cancel running jobs (redundant for ctx.Done(), but makes code simpler)
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c.cancel()
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}()
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c.c.Run()
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close(c.fatal)
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return err
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}
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