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Informations about the package daemon
Ustream_Daemon 
Ustream_Daemon is a library for running php code as daemons. It works around php's limitations in this area and
implements some sane default behaviors. The main goal is to provide a robust way of running php code continously while
decoupling the business logic from the details of running a background task. We hate superflous boilerplate like everyone
else so the daemons have a common entry point.
Download
Github: http://github.com/ustream/daemon/tree/master
Composer:
composer require ustream/daemon:~0.1.0Versioning
We follow the guidelines on http://semver.org
Features
- contexts
- extensible via symfony event dispatcher
Usage
We recommend using the library with a single entry point per project. Creating this entry point is up to you, it should bootstrap your application as you need it, then call the daemon runner class:
You can start a daemon by calling this entry point with the --id="daemon-name" parameter. The config file daemon-name.ini is used from the provided ini directory to configure the daemon.
Daemon configuration
The most important is to specify a factory method, which returns an object implementing the Ustream_Daemon_Task interface. The interface itself has only one method, doTask() - you should specify what the daemon should periodically do in this method. This is the only required element of the ini file, the others are optional.
- factory : A string specifying a class and static factory method to get the task
- sleep : An integer, specifying the period length of the
doTask()runs. The daemon waits this many seconds (substracting the real execution length of thedoTask()method, so it normally won't accumulate delay) - min-sleep : Another integer value in seconds, specifying the minimum break between two runs. This is useful if the task itself causes something (like system load for example) which needs a bit break even if there would be not enough time before the next run.
- memory-limit : Specified as the php shorthand notation for bytes (see the manual ). This will be set as
memory_limitviaini_set - memory-threshold : A value between 0 and 100. It specifies the part of the above memory-limit which is allowed to be used by the daemon, in percents. The runner checks the memory usage after each run and exits the process if it is exceeded.
- log-dir : A path to a directory where the daemon should put its log file.
- common-log : A path to a common log file where the daemon handler itself writes some logs (like when it starts or stops a child process). Typical use case for it is to have one file which is used by all daemons and logs their starts and stops.
An example configuration ini file:
Events
The daemon dispatches two events. One on startup, and one on each completion of its task. The event identifier constants are defined in the Ustream_Daemon_Event class. You can add listeners to these events via the addListeners() method. An example:
The events are dispatched via symfony's event dispatcher, which basically means that the listener object's specified method will be called with an event object as parameter. More info about this in the symfony manual
Contributing
Please see CONTRIBUTING.md for details.
Credits
Ustream_Daemon is maintained by ustream.tv, inc
Authors:
License
Ustream_Daemon is Copyright © 2013 Ustream Inc. It is free software, and may be redistributed under the terms specified in the LICENSE file.
All versions of daemon with dependencies
ext-pcntl Version *
ext-posix Version *
psr/log Version 1.0.0
symfony/event-dispatcher Version >2.1.0,<2.4