FastRSS

Parse RSS feeds very quickly

• This is rust NIF built using rustler
• Uses the RSS crate to do the actual RSS parsing

Speed

Currently this is already much faster than most of the pure elixir/erlang packages out there. In benchmarks there are speed improvements anywhere between 5.94x - 49.03x over the next fastest package ([feeder_ex])(https://github.com/manukall/feeder_ex) that was tested.

Compared to the slowest elixir options tested (feed_raptor, elixir_feed_parser), FastRSS was sometimes 255.53x faster and used 5,412,308.17x less memory (0.00156 MB vs 8423.70 MB).

Installation

This package is available on hex.

It can be installed by adding fast_rss to your list of dependencies in mix.exs:

def deps do
  [
    {:fast_rss, "~> 0.2.0"}
  ]
end

You also need the rust compiler installed: https://www.rust-lang.org/tools/install

curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh

Usage

There is only one function it takes an RSS string and outputs an {:ok, map()} with string keys.

iex(1)>  {:ok, map_of_rss} = FastRSS.parse("...rss_feed_string...")
iex(2)> Map.keys(map_of_rss)
["categories", "cloud", "copyright", "description", "docs", "dublin_core_ext",
 "extensions", "generator", "image", "items", "itunes_ext", "language",
 "last_build_date", "link", "managing_editor", "namespaces", "pub_date",
 "rating", "skip_days", "skip_hours", "syndication_ext", "text_input", "title",
 "ttl", "webmaster"]

The docs can be found at https://hexdocs.pm/fast_rss.

Benchmark

Benchmark run from 2020-02-22 05:23:47.524699Z UTC

System

Benchmark suite executing on the following system:

Configuration

Benchmark suite executing with the following configuration:

Statistics

Input: anxiety

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Comparison

Memory Usage

Input: ben

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Input: daily

Run Time

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Input: dave

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Input: sleepy

Run Time

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Input: stuff

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