Winter

Winter is a system for maintaining the configuration of java web applications with a specific focus on the Felix OSGi container. Simply create a Winterfile and describe the configuration of your application with the Winter DSL. You can then use the winter CLI tool to winter build the application. This will download all the necessary dependencies for your application. When the build is complete, you can run it with winter start.

Installation from Rubygems

$ gem install winter

Installation from source

$ git clone [email protected]:liveops/winter.git && cd winter
$ gem build winter.gemspec
$ gem install winter*.gem

Installation with bundler

Add this line to your application's Gemfile:

gem 'winter'

And then execute:

$ bundle install

(If you use `rbenv`, this would be a good time for an `rbenv rehash`)

To make running this easier, add this to your ~/.bash_profile

# bundle exec stuff
function be {
  CUR=$PWD
  LAST=
  until [ "$CUR" == "$LAST" ]; do
    if [ -e "$CUR/Gemfile" ]; then
      bundle exec "$@"
      return
    fi
    LAST=$CUR
    CUR=$(dirname $CUR)
  done
  "$@"
}
alias winter='be winter'

Example

Create a 'Winterfile' in a new directory called 'sample'.

$ mkdir sample && touch Winterfile

Describe your application with the DSL. Put this in the Winterfile:

name "sample_app"
lib 'org.apache.felix', 'org.apache.felix.shell',         '1.4.3'
lib 'org.apache.felix', 'org.apache.felix.shell.remote',  '1.1.2'
lib 'org.apache.felix', 'org.apache.felix.log',           '1.0.1'

Build the application to download all the dependencies.

$ winter build
Run the sample application

$ winter start
Check to see that the app is running

$ winter status
Turn off the application

$ winter stop

CLI Usage

All commands that need a Winterfile will use the default filename 'Winterfile' by default. This can be overridden by specifying a different filename in its place e.g. winter validate someOtherFilename.

$ winter
Commands:
  winter build [Winterfile]                      # Build a service from a Win...
  winter fetch <URL|GROUP> [artifact] [version]  # Download the Winterfile an...
  winter help [COMMAND]                          # Describe available command...
  winter start [Winterfile]                      # Start the services in [Win...
  winter status                                  # Show status of available s...
  winter stop [Winterfile]                       # Stop the services in [Wint...
  winter validate [Winterfile]                   # (optional) Check the confi...
  winter version                                 # Display version information.

Build

Build a service from a Winterfile

Usage:
  winter build [Winterfile]

Options:
  [--group=GROUP]      # Config group
  [--verbose=VERBOSE]  # Verbose maven output
  [--debug=DEBUG]      # Set log level to debug.
  [--local=LOCAL]      # Resolve dependencies only from local repository

Fetch

Download the Winterfile and configuration from a URL.

Usage:
  winter fetch <URL|GROUP> [artifact] [version]

Options:
      [--debug=DEBUG]                     # Set log level to debug.
  --repos, [--repositories=REPOSITORIES]  # Comma separated list of repositories to search.

Start

Start the services in [Winterfile]

Usage:
  winter start [Winterfile]

Options:
  [--group=GROUP]         # Config group
  [--debug=DEBUG]         # Set log level to debug.

--con, [--console=CONSOLE] # Send console output to [file] # Default: /dev/null

Status

Show status of available services

Usage:
  winter status

Stop

Stop the services in [Winterfile]

Usage:
  winter stop [Winterfile]

Options:
  [--group=GROUP]  # Config group

Validate

Check the configuration files

Usage:
  winter validate [Winterfile]

Options:
  [--group=GROUP]  # Config group
  [--debug=DEBUG]  # Set log level to debug.

Version

Display version information.

Usage:
  winter version

Winterfile DSL

bundle (group, artifact, [version], [{}])

Specify an application bundle to deploy into the OSGi container. If version is not speicfied, it will default to LATEST. The 4th parameter is a block that can be used to specify the packaging type (defaults to 'jar'). For example, if the bundle is packaged as a war file, the block can read {:package => 'war'}. Bundles added the Winterfile will be downoaded and placed in the './run/name/bundles' directory (relative to the Winterfile) when winter build is performed.

conf (directory)

The contents of this directory tree is read and any file ending in '*.erb' is parsed as a template. The result of the template is placed in './run/name/conf' (relative to the Winterfile) and will overwrite any files that already exist there.

directive (key, [value])

Add a directive to the java invocation. directive 'com.example.logger', 'true' is translated to -D com.example.logger=true.

felix (group, artifact, [version])

Specify the felix version to use. If none is specified, felix version 3.0.6 is added by default.

group (Symbol)

Multiple configuration groups may be specified in a Winterfile, and they may be nested. Any number of other commands may be placed in a group permitting changes in configuration, bundles, libraries and even Felix version changes. For Example:

info "This is the default group"
group :groupName do 
  info "This is inside the group groupName"
  group :nestedGroup do
    info "This is inside the group nestedName"
  end
end

The groups are then accessed from the command line as a comma separated list: $ winter validate --group=groupName,groupName::nestedGroup This is the default group This is inside the group groupName This is inside the group nestedGroup

info (String)

Print a statment to STDOUT as the DSL is parsed. Useful for debugging.

lib (group, artifact, [version])

Specify an application library or dependency. If version is not speicfied, it will default to LATEST. Libraries listed in the Winterfile will be downoaded and placed in the './run/name/libs' directory (relative to the Winterfile) when winter build is performed. This directory is added to the classpath at runtime.

name (String)

(REQUIRED) Give a name to this configuration group. This is used to describe a running instance when viewing winter status information, and allows a developer to create discrete configuration groups. The purpose of creating configuration groups is to allow for multiple containers to run on the same machine e.g. clustered applications.

pom (file | url)

The pom file is parsed and any dependencies listed as <scope>provided</scope> are added as application dependencies. When winter build is executed, these dependencies are downloaded and placed in './run/name/libs' relative to the Winterfile. A local file may be specified (relative to the Winterfile) or if a URL is specified it is fetched and parsed.

read (file)

The 'read' verb is used to import json configuration files relative to the Winterfile. The json structure is parsed and merged with the @config variable, overwriting existing values. Several 'read' directives may be specified in a single Winterfile. For example:

read 'conf/default.json'
group :dev do 
  read 'conf/dev_config.json'
end

repository (directory | url)

Add repositories to the maven search path when downloading bundles, libs and felix versions. Generally a URL is specified, but an ~/.m2 style directory will also work. (aliased as 'repo' for your convienience)

Contributing

Fork it
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create new Pull Request

License and Copyright

Right to Use this Documentation: This material is licensed under the Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) License. You may not exercise any rights in this material except under the terms of the CC BY-SA 3.0 License, a copy of which may be found at:

 http://creativecommons.org/licenses/by-sa/3.0/

Right to Use the Software Referenced Herein: Unless otherwise provided for a specific file, the product(s) and files referenced herein are licensed under the Apache License, Version 2.0 (the "License"); you may not use such files 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.