mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 01:52:46 +00:00
126 lines
5.1 KiB
Markdown
126 lines
5.1 KiB
Markdown
|
[![GoDoc](http://godoc.org/github.com/robfig/cron?status.png)](http://godoc.org/github.com/robfig/cron)
|
||
|
[![Build Status](https://travis-ci.org/robfig/cron.svg?branch=master)](https://travis-ci.org/robfig/cron)
|
||
|
|
||
|
# cron
|
||
|
|
||
|
Cron V3 has been released!
|
||
|
|
||
|
To download the specific tagged release, run:
|
||
|
|
||
|
go get github.com/robfig/cron/v3@v3.0.0
|
||
|
|
||
|
Import it in your program as:
|
||
|
|
||
|
import "github.com/robfig/cron/v3"
|
||
|
|
||
|
It requires Go 1.11 or later due to usage of Go Modules.
|
||
|
|
||
|
Refer to the documentation here:
|
||
|
http://godoc.org/github.com/robfig/cron
|
||
|
|
||
|
The rest of this document describes the the advances in v3 and a list of
|
||
|
breaking changes for users that wish to upgrade from an earlier version.
|
||
|
|
||
|
## Upgrading to v3 (June 2019)
|
||
|
|
||
|
cron v3 is a major upgrade to the library that addresses all outstanding bugs,
|
||
|
feature requests, and rough edges. It is based on a merge of master which
|
||
|
contains various fixes to issues found over the years and the v2 branch which
|
||
|
contains some backwards-incompatible features like the ability to remove cron
|
||
|
jobs. In addition, v3 adds support for Go Modules, cleans up rough edges like
|
||
|
the timezone support, and fixes a number of bugs.
|
||
|
|
||
|
New features:
|
||
|
|
||
|
- Support for Go modules. Callers must now import this library as
|
||
|
`github.com/robfig/cron/v3`, instead of `gopkg.in/...`
|
||
|
|
||
|
- Fixed bugs:
|
||
|
- 0f01e6b parser: fix combining of Dow and Dom (#70)
|
||
|
- dbf3220 adjust times when rolling the clock forward to handle non-existent midnight (#157)
|
||
|
- eeecf15 spec_test.go: ensure an error is returned on 0 increment (#144)
|
||
|
- 70971dc cron.Entries(): update request for snapshot to include a reply channel (#97)
|
||
|
- 1cba5e6 cron: fix: removing a job causes the next scheduled job to run too late (#206)
|
||
|
|
||
|
- Standard cron spec parsing by default (first field is "minute"), with an easy
|
||
|
way to opt into the seconds field (quartz-compatible). Although, note that the
|
||
|
year field (optional in Quartz) is not supported.
|
||
|
|
||
|
- Extensible, key/value logging via an interface that complies with
|
||
|
the https://github.com/go-logr/logr project.
|
||
|
|
||
|
- The new Chain & JobWrapper types allow you to install "interceptors" to add
|
||
|
cross-cutting behavior like the following:
|
||
|
- Recover any panics from jobs
|
||
|
- Delay a job's execution if the previous run hasn't completed yet
|
||
|
- Skip a job's execution if the previous run hasn't completed yet
|
||
|
- Log each job's invocations
|
||
|
- Notification when jobs are completed
|
||
|
|
||
|
It is backwards incompatible with both v1 and v2. These updates are required:
|
||
|
|
||
|
- The v1 branch accepted an optional seconds field at the beginning of the cron
|
||
|
spec. This is non-standard and has led to a lot of confusion. The new default
|
||
|
parser conforms to the standard as described by [the Cron wikipedia page].
|
||
|
|
||
|
UPDATING: To retain the old behavior, construct your Cron with a custom
|
||
|
parser:
|
||
|
|
||
|
// Seconds field, required
|
||
|
cron.New(cron.WithSeconds())
|
||
|
|
||
|
// Seconds field, optional
|
||
|
cron.New(
|
||
|
cron.WithParser(
|
||
|
cron.SecondOptional | cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow | cron.Descriptor))
|
||
|
|
||
|
- The Cron type now accepts functional options on construction rather than the
|
||
|
previous ad-hoc behavior modification mechanisms (setting a field, calling a setter).
|
||
|
|
||
|
UPDATING: Code that sets Cron.ErrorLogger or calls Cron.SetLocation must be
|
||
|
updated to provide those values on construction.
|
||
|
|
||
|
- CRON_TZ is now the recommended way to specify the timezone of a single
|
||
|
schedule, which is sanctioned by the specification. The legacy "TZ=" prefix
|
||
|
will continue to be supported since it is unambiguous and easy to do so.
|
||
|
|
||
|
UPDATING: No update is required.
|
||
|
|
||
|
- By default, cron will no longer recover panics in jobs that it runs.
|
||
|
Recovering can be surprising (see issue #192) and seems to be at odds with
|
||
|
typical behavior of libraries. Relatedly, the `cron.WithPanicLogger` option
|
||
|
has been removed to accommodate the more general JobWrapper type.
|
||
|
|
||
|
UPDATING: To opt into panic recovery and configure the panic logger:
|
||
|
|
||
|
cron.New(cron.WithChain(
|
||
|
cron.Recover(logger), // or use cron.DefaultLogger
|
||
|
))
|
||
|
|
||
|
- In adding support for https://github.com/go-logr/logr, `cron.WithVerboseLogger` was
|
||
|
removed, since it is duplicative with the leveled logging.
|
||
|
|
||
|
UPDATING: Callers should use `WithLogger` and specify a logger that does not
|
||
|
discard `Info` logs. For convenience, one is provided that wraps `*log.Logger`:
|
||
|
|
||
|
cron.New(
|
||
|
cron.WithLogger(cron.VerbosePrintfLogger(logger)))
|
||
|
|
||
|
|
||
|
### Background - Cron spec format
|
||
|
|
||
|
There are two cron spec formats in common usage:
|
||
|
|
||
|
- The "standard" cron format, described on [the Cron wikipedia page] and used by
|
||
|
the cron Linux system utility.
|
||
|
|
||
|
- The cron format used by [the Quartz Scheduler], commonly used for scheduled
|
||
|
jobs in Java software
|
||
|
|
||
|
[the Cron wikipedia page]: https://en.wikipedia.org/wiki/Cron
|
||
|
[the Quartz Scheduler]: http://www.quartz-scheduler.org/documentation/quartz-2.3.0/tutorials/tutorial-lesson-06.html
|
||
|
|
||
|
The original version of this package included an optional "seconds" field, which
|
||
|
made it incompatible with both of these formats. Now, the "standard" format is
|
||
|
the default format accepted, and the Quartz format is opt-in.
|