init: PluginFactory support

.github/CONTRIBUTING.md

@@ -0,0 +1,65 @@
+# Contributing to Logstash
+
+All contributions are welcome: ideas, patches, documentation, bug reports,
+complaints, etc!
+
+Programming is not a required skill, and there are many ways to help out!
+It is more important to us that you are able to contribute.
+
+That said, some basic guidelines, which you are free to ignore :)
+
+## Want to learn?
+
+Want to lurk about and see what others are doing with Logstash? 
+
+* The irc channel (#logstash on irc.freenode.org) is a good place for this
+* The [forum](https://discuss.elastic.co/c/logstash) is also
+  great for learning from others.
+
+## Got Questions?
+
+Have a problem you want Logstash to solve for you? 
+
+* You can ask a question in the [forum](https://discuss.elastic.co/c/logstash)
+* Alternately, you are welcome to join the IRC channel #logstash on
+irc.freenode.org and ask for help there!
+
+## Have an Idea or Feature Request?
+
+* File a ticket on [GitHub](https://github.com/elastic/logstash/issues). Please remember that GitHub is used only for issues and feature requests. If you have a general question, the [forum](https://discuss.elastic.co/c/logstash) or IRC would be the best place to ask.
+
+## Something Not Working? Found a Bug?
+
+If you think you found a bug, it probably is a bug.
+
+* If it is a general Logstash or a pipeline issue, file it in [Logstash GitHub](https://github.com/elasticsearch/logstash/issues)
+* If it is specific to a plugin, please file it in the respective repository under [logstash-plugins](https://github.com/logstash-plugins)
+* or ask the [forum](https://discuss.elastic.co/c/logstash).
+
+# Contributing Documentation and Code Changes
+
+If you have a bugfix or new feature that you would like to contribute to
+logstash, and you think it will take more than a few minutes to produce the fix
+(ie; write code), it is worth discussing the change with the Logstash users and developers first! You can reach us via [GitHub](https://github.com/elastic/logstash/issues), the [forum](https://discuss.elastic.co/c/logstash), or via IRC (#logstash on freenode irc)
+Please note that Pull Requests without tests will not be merged. If you would like to contribute but do not have experience with writing tests, please ping us on IRC/forum or create a PR and ask our help.
+
+## Contributing to plugins
+
+Check our [documentation](https://www.elastic.co/guide/en/logstash/current/contributing-to-logstash.html) on how to contribute to plugins or write your own! It is super easy!
+
+## Contribution Steps
+
+1. Test your changes! [Run](https://github.com/elastic/logstash#testing) the test suite
+2. Please make sure you have signed our [Contributor License
+   Agreement](https://www.elastic.co/contributor-agreement/). We are not
+   asking you to assign copyright to us, but to give us the right to distribute
+   your code without restriction. We ask this of all contributors in order to
+   assure our users of the origin and continuing existence of the code. You
+   only need to sign the CLA once.
+3. Send a pull request! Push your changes to your fork of the repository and
+   [submit a pull
+   request](https://help.github.com/articles/using-pull-requests). In the pull
+   request, describe what your changes do and mention any bugs/issues related
+   to the pull request.
+
+

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,9 @@
+Please post all product and debugging questions on our [forum](https://discuss.elastic.co/c/logstash). Your questions will reach our wider community members there, and if we confirm that there is a bug, then we can open a new issue here.
+
+For all general issues, please provide the following details for fast resolution:
+
+- Version:
+- Operating System:
+- Config File (if you have sensitive info, please remove it):
+- Sample Data:
+- Steps to Reproduce:

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1 @@
+Thanks for contributing to Logstash! If you haven't already signed our CLA, here's a handy link: https://www.elastic.co/contributor-agreement/

.travis.yml

@@ -0,0 +1,6 @@
+---
+import:
+  - logstash-plugins/.ci:travis/travis.yml@1.x
+matrix:
+  include:
+  - env: ELASTIC_STACK_VERSION=7.9.3 # last release pre-introduction of core Contextualizer

CHANGELOG.md

@@ -0,0 +1,2 @@
+# 1.0.0
+ - Support Mixin for ensuring a plugin has an `plugin_factory` method that returns a `PluginFactory` that can be used to instantiate wrapped plugins that maintain the pipeline execution context.

Gemfile

@@ -0,0 +1,12 @@
+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in logstash-mass_effect.gemspec
+gemspec
+
+logstash_path = ENV["LOGSTASH_PATH"] || "../../logstash"
+use_logstash_source = ENV["LOGSTASH_SOURCE"] && ENV["LOGSTASH_SOURCE"].to_s == "1"
+
+if Dir.exist?(logstash_path) && use_logstash_source
+  gem 'logstash-core', :path => "#{logstash_path}/logstash-core"
+  gem 'logstash-core-plugin-api', :path => "#{logstash_path}/logstash-core-plugin-api"
+end

LICENSE

@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
+      by such Contributor that are necessarily infringed by their
+      Contribution(s) alone or by combination of their Contribution(s)
+      with the Work to which such Contribution(s) was submitted. If You
+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
+      modifications, and in Source or Object form, provided that You
+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
+          attribution notices from the Source form of the Work,
+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright 2020 Elastic and contributors
+
+   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.

README.md

@@ -0,0 +1,67 @@
+# Plugin Factory Support Mixin
+
+[![Build Status](https://travis-ci.com/logstash-plugins/logstash-mixin-plugin_factory_support.svg?branch=main)](https://travis-ci.com/logstash-plugins/logstash-mixin-plugin_factory_support)
+
+This gem provides an API-compatible implementation of a Plugin Factory,
+which hooks into Logstash internals
+.
+
+## Usage (simple)
+
+1. Add version `~>1.0` of this gem as a runtime dependency of your Logstash plugin's `gemspec`:
+
+    ~~~ ruby
+    Gem::Specification.new do |s|
+      # ...
+
+      s.add_runtime_dependency 'logstash-mixin-plugin_factory_support', '~>1.0'
+    end
+    ~~~
+
+2. In your plugin code, require this library and include it into your plugin class
+   that already inherits `LogStash::Plugin`:
+
+    ~~~ ruby
+    require 'logstash/plugin_mixins/plugin_factory_support'
+
+    class LogStash::Inputs::Foo < Logstash::Inputs::Base
+      include LogStash::PluginMixins::PluginFactorySupport
+
+      # ...
+    end
+    ~~~
+
+3. When instantiating other plugins from inside your plugin, _do not_ send `new`
+   to the plugin class directly. Instead use the `plugin_factory`
+   method to obtain a PluginFactory, and then use one of its `#input`, `#output`,
+   `#codec`, or `#filter` methods with your plugin's name to obtain a proxy for
+   the plugin class, and then send the proxy `#new` with your options as normal.
+   This will ensure that the inner plugin instance is properly bound to the pipeline
+   and execution context from the outer plugin.
+
+    ~~~ ruby
+      def register
+        @internal_grok = plugin_factory.filter('grok').new("match" => {"message" => "^PATTERN"})
+      end
+    ~~~
+
+    Expressed as a diff:
+
+    ~~~ diff
+       def register
+    -    @internal_grok = ::LogStash::Filter::Grok.new("match" => {"message" => "^PATTERN"})
+    +    @internal_grok = plugin_factory.filter('grok').new("match" => {"message" => "^PATTERN"})
+       end
+
+    ~~~
+
+    Note: when instantiating an inner plugin with a plugin factory, managing its lifecycle remains
+    an implementation detail of the _outer_ plugin. Lifecycle events like `LogStash::Plugin#close`,
+    `LogStash::Inputs::Base#stop`, or `LogStash::Codecs::Base#flush` for the outer plugin are not
+    automatically propagated to the inner plugin.
+
+## Development
+
+This gem:
+ - *MUST* remain API-stable at 1.x
+ - *MUST NOT* introduce additional runtime dependencies

Rakefile

@@ -0,0 +1,3 @@
+# encoding: utf-8
+
+require "logstash/devutils/rake"