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# sigurd | ||
Small gem to manage executing looping processes and signal handling | ||
Small gem to manage executing looping processes and signal handling. | ||
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<p align="center"> | ||
<a href="https://badge.fury.io/rb/sigurd"><img src="https://badge.fury.io/rb/deimos-ruby.svg" alt="Gem Version" height="18"></a> | ||
<img src="https://img.shields.io/codeclimate/maintainability/flipp-oss/sigurd.svg"/> | ||
</p> | ||
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# Installation | ||
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Add this line to your application's Gemfile: | ||
```ruby | ||
gem 'sigurd' | ||
``` | ||
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And then execute: | ||
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$ bundle | ||
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Or install it yourself as: | ||
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$ gem install sigurd | ||
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# Versioning | ||
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We use a version of semver for this gem. Any change in previous behavior | ||
(something works differently or something old no longer works) | ||
is denoted with a bump in the minor version (0.4 -> 0.5). Patch versions | ||
are for bugfixes or new functionality which does not affect existing code. You | ||
should be locking your Gemfile to the minor version: | ||
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```ruby | ||
gem 'sigurd', '0.0.1' | ||
``` | ||
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# Usage | ||
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Sigurd exposes two classes for use with a third class. The ideas is as follows: | ||
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* You have any object which responds to the `start` and `stop` methods. | ||
This object is called a "Runner". When the `stop` method is called, | ||
the runner should gracefully shut down. | ||
* You create an `Executor` class - this manages a thread pool for a | ||
list of runners. | ||
* You create a `SignalHandler` which is the topmost object. This will | ||
handle the signals sent by the system and gracefully forward the | ||
requests. You pass the executor into the SignalHandler. | ||
* Finally, you call `start` on the `SignalHandler` to begin the execution. | ||
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Sample code: | ||
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```ruby | ||
class TestRunner | ||
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def start | ||
loop do | ||
break if @signal_to_stop | ||
# do some logic here | ||
end | ||
end | ||
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def stop | ||
@signal_to_stop = true | ||
end | ||
end | ||
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runners = (1..2).map { TestRunner.new } | ||
executor = Sigurd::Executor.new(runners, sleep_seconds: 5, logger: Logger.new(STDOUT)) | ||
Sigurd::SignalHandler.new(executor).run! | ||
``` | ||
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If you have only a single runner, you can pass it into the `SignalHandler` | ||
directly, without using an `Executor`: | ||
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```ruby | ||
Sigurd::SignalHandler.new(executor).run! | ||
``` | ||
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By default, if any of your runners fails, Sigurd will use an exponential | ||
backoff to wait before restarting it. You can instead use the `sleep_seconds` | ||
setting to always sleep a fixed amount of time before retrying. There | ||
is no limit to retries. | ||
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## Contributing | ||
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Bug reports and pull requests are welcome on GitHub at https://github.com/flipp-oss/deimos . | ||
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We have more information on the [internal architecture](docs/ARCHITECTURE.md) of Deimos | ||
for contributors! | ||
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### Linting | ||
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Deimos uses Rubocop to lint the code. Please run Rubocop on your code | ||
before submitting a PR. | ||
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--- | ||
<p align="center"> | ||
Sponsored by<br/> | ||
<a href="https://corp.flipp.com/"> | ||
<img src="support/flipp-logo.png" title="Flipp logo" style="border:none;"/> | ||
</a> | ||
</p> |
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