Feederer

Feederer (github) (docs) can fetch more than 17 Major singles titles from your RSS / Atom feeds.

Feederer is an Elixir wrapper for feedparser.

It parses XML syndication feeds such as RSS 0.90, Netscape RSS 0.91, Userland RSS 0.91, RSS 0.92, RSS 0.93, RSS 0.94, RSS 1.0, RSS 2.0, Atom 0.3, Atom 1.0 and CDF feeds from a URL (optionally by being respectful of both your bandwidth and the feed host's by using HTTP ETag and Last-Modified headers), a local file or a string.

Installation

Requirements: Python 2.6+ or Python 3+, *sh. (In other words, it should work on anything except Microsoft Windows provided you have a somewhat up-to-date Python version installed. If you'd like to support Microsoft Windows it's certainly doable, /priv/install.sh is a good starting point.)

Important notice: This package depends on an unpackaged version of erlport, therefore mix will not install it automatically. It means you will have to manually add the following to your own mix.exs:

{:erlport, git: "https://github.com/hdima/erlport.git", ref: "246b7722d62b87b48be66d9a871509a537728962"}

Production

1. Add {:feederer, "~> 0.5.9"} to your mix.exs dependencies.
2. Add :feederer to your applications in mix.exs: [applications: […, :feederer]]
3. Install erlport==0.6 and feedparser==5.2.1 using pip or easy_install. Your Elixir application will need access to these so make sure they are either installed globally or add their location to your application PATH.
4. Make sure python will be available to the application as well.
5. Read the Configuration section below to customize the python env, path and command.

Development

1. Add {:feederer, "~> 0.5.9"} to your mix.exs dependencies.
2. Add :feederer to your applications in mix.exs: [applications: […, :feederer]]
3. Run mix feedparser.install to install the python feedparser dependencies.
4. Configuration is not necessary at this point, Feederer comes with sensible defaults. Take a look at Configuration below anyway.

Configuration

Configuration is optional, everything has default values.

1. Configuration should go your application config/ directory.
2. erlport keyword list: anything allowed by python.start/1. It's the right place to tell erlport about your python path, env, name.
3. poolboy keyword list: anything allowed as second argument (poolArgs) to poolboy.child_spec/3 except name and worker_module (these two will be ignored and set to default values).
4. supervisor_strategy keyword: Supervisor strategy for Feederer worker pool.

Sample configuration:

# In your config/config.exs file
config :feederer,
  erlport: [
    python_path: to_char_list("/python/dependencies/folder/"),
    compressed: 6,
    python: 'python'
  ],
  poolboy: [
    size: 10,
    max_overflow: 0
  ],
  supervisor_strategy: :one_for_one

Usage

Parsing a distant feed:

url = "http://www.rssboard.org/files/sample-rss-2.xml"
{:ok, parsed} = Feederer.parse(url)
feed_link = parsed[:feed][:link] # "http://liftoff.msfc.nasa.gov/"

Parsing a local file:

file = File.read! @rss_file
{:ok, parsed} = Feederer.parse(file)
feed_title = parsed[:feed][:title] # the feed title

Passing extra arguments to feedparser:

Use a keyword list as Feederer.parse second argument. Allowed arguments are: etag, modified, agent, referrer, request_headers, response_headers.

See feedparser documentation for more information about these arguments.

{:ok, parsed} = Feederer.parse(file, etag: foo, request_headers: bar)

More usage examples: See /test/feederer_test.exs