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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| /* | ||
| http://www.apache.org/licenses/LICENSE-2.0.txt | ||
| Copyright 2016 Intel Corporation | ||
| 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 schedule | ||
|
|
||
| import ( | ||
| "errors" | ||
| "time" | ||
|
|
||
| "github.com/robfig/cron" | ||
| ) | ||
|
|
||
| // ErrMissingCronEntry indicates missing cron entry | ||
| var ErrMissingCronEntry = errors.New("Cron entry is missing") | ||
|
|
||
| // CronSchedule is a schedule that waits as long as specified in cron entry | ||
| type CronSchedule struct { | ||
| entry string | ||
| enabled bool | ||
| state ScheduleState | ||
| schedule *cron.Cron | ||
| } | ||
|
|
||
| // NewCronSchedule creates and starts new cron schedule and returns an instance of CronSchedule | ||
| func NewCronSchedule(entry string) *CronSchedule { | ||
| schedule := cron.New() | ||
| return &CronSchedule{ | ||
| entry: entry, | ||
| schedule: schedule, | ||
| enabled: false, | ||
| } | ||
| } | ||
|
|
||
| // GetState returns state of CronSchedule | ||
| func (c *CronSchedule) GetState() ScheduleState { | ||
| return c.state | ||
| } | ||
|
|
||
| // Validate returns error if cron entry dosn't match crontab format | ||
| func (c *CronSchedule) Validate() error { | ||
| if c.entry == "" { | ||
| return ErrMissingCronEntry | ||
| } | ||
| _, err := cron.Parse(c.entry) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Wait waits as long as specified in cron entry | ||
| func (c *CronSchedule) Wait(last time.Time) Response { | ||
| var err error | ||
| now := time.Now() | ||
|
|
||
| // first run | ||
| if (last == time.Time{}) { | ||
| last = now | ||
| } | ||
| // schedule not enabled, either due to first run or invalid cron entry | ||
| if !c.enabled { | ||
| err = c.schedule.AddFunc(c.entry, func() {}) | ||
| if err != nil { | ||
| c.state = Error | ||
| } else { | ||
| c.enabled = true | ||
| } | ||
| } | ||
|
|
||
| var misses uint | ||
| if c.enabled { | ||
| s := c.schedule.Entries()[0].Schedule | ||
|
|
||
| // calculate misses | ||
| for next := last; next.Before(now); { | ||
| next = s.Next(next) | ||
| if next.After(now) { | ||
| break | ||
| } | ||
| misses++ | ||
| } | ||
|
|
||
| // wait | ||
| waitTime := s.Next(now) | ||
| time.Sleep(waitTime.Sub(now)) | ||
| } | ||
|
|
||
| return &CronScheduleResponse{ | ||
| state: c.GetState(), | ||
| err: err, | ||
| missed: misses, | ||
| lastTime: time.Now(), | ||
| } | ||
| } | ||
|
|
||
| // CronScheduleResponse is the response from CronSchedule | ||
| type CronScheduleResponse struct { | ||
| state ScheduleState | ||
| err error | ||
| missed uint | ||
| lastTime time.Time | ||
| } | ||
|
|
||
| // State returns the state of the Schedule | ||
| func (c *CronScheduleResponse) State() ScheduleState { | ||
| return c.state | ||
| } | ||
|
|
||
| // Error returns last error | ||
| func (c *CronScheduleResponse) Error() error { | ||
| return c.err | ||
| } | ||
|
|
||
| // Missed returns any missed intervals | ||
| func (c *CronScheduleResponse) Missed() uint { | ||
| return c.missed | ||
| } | ||
|
|
||
| // LastTime returns the last response time | ||
| func (c *CronScheduleResponse) LastTime() time.Time { | ||
| return c.lastTime | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,77 @@ | ||
| /* | ||
| http://www.apache.org/licenses/LICENSE-2.0.txt | ||
| Copyright 2016 Intel Corporation | ||
| 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 schedule | ||
|
|
||
| import ( | ||
| "testing" | ||
| "time" | ||
|
|
||
| . "github.com/smartystreets/goconvey/convey" | ||
| ) | ||
|
|
||
| func TestCronSchedule(t *testing.T) { | ||
| Convey("Cron Schedule", t, func() { | ||
| Convey("valid cron entry", func() { | ||
| i := "0 * * * * *" | ||
| c := NewCronSchedule(i) | ||
| e := c.Validate() | ||
| So(e, ShouldBeNil) | ||
| }) | ||
| Convey("missing cron entry", func() { | ||
| i := "" | ||
| c := NewCronSchedule(i) | ||
| e := c.Validate() | ||
| So(e, ShouldEqual, ErrMissingCronEntry) | ||
| }) | ||
| Convey("invalid cron entry", func() { | ||
| i := "invalid cron entry" | ||
| c := NewCronSchedule(i) | ||
| e := c.Validate() | ||
| So(e, ShouldNotBeNil) | ||
| }) | ||
| Convey("wait on valid cron entry", func() { | ||
| i := "@every 1s" | ||
| c := NewCronSchedule(i) | ||
| now := time.Now() | ||
| r := c.Wait(now) | ||
| So(r, ShouldNotBeNil) | ||
| So(r.State(), ShouldEqual, Active) | ||
| So(r.Error(), ShouldBeNil) | ||
| So(r.Missed(), ShouldEqual, 0) | ||
| lastTime := r.LastTime() | ||
| l := lastTime.After(now) && lastTime.Before(time.Now()) | ||
| So(l, ShouldBeTrue) | ||
| }) | ||
| Convey("counting misses in Wait()", func() { | ||
| i := "@every 1s" | ||
| c := NewCronSchedule(i) | ||
| now := time.Now() | ||
| r := c.Wait(now) | ||
| then := now.Add(-time.Duration(10) * time.Second) | ||
| r = c.Wait(then) | ||
| So(r, ShouldNotBeNil) | ||
| So(r.State(), ShouldEqual, Active) | ||
| So(r.Error(), ShouldBeNil) | ||
| So(r.Missed(), ShouldBeBetweenOrEqual, 10, 12) | ||
| lastTime := r.LastTime() | ||
| l := lastTime.After(now) && lastTime.Before(time.Now()) | ||
| So(l, ShouldBeTrue) | ||
| }) | ||
| }) | ||
| } |