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https://github.com/avencera/fast_rss
Fast Elixir RSS feed parser, a NIF wrapper around the Rust RSS crate
https://github.com/avencera/fast_rss
atom elixir erlang feeds hacktoberfest parser rss rust
Last synced: about 1 month ago
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Fast Elixir RSS feed parser, a NIF wrapper around the Rust RSS crate
- Host: GitHub
- URL: https://github.com/avencera/fast_rss
- Owner: avencera
- License: apache-2.0
- Created: 2020-02-20T20:06:37.000Z (over 4 years ago)
- Default Branch: master
- Last Pushed: 2024-07-06T15:39:40.000Z (4 months ago)
- Last Synced: 2024-09-30T03:42:15.519Z (about 2 months ago)
- Topics: atom, elixir, erlang, feeds, hacktoberfest, parser, rss, rust
- Language: Elixir
- Homepage: https://avencera.github.io/fast_rss/
- Size: 3.1 MB
- Stars: 110
- Watchers: 5
- Forks: 19
- Open Issues: 3
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
README
Parse RSS feeds very quickly
Intro
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Compatibility
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Installation
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Usage
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Benchmarks
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Deploying
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License
---
## Intro
Parse RSS feeds very quickly
- This is rust NIF built using [rustler](https://github.com/rusterlium/rustler)
- Uses the [RSS](https://crates.io/crates/rss) rust 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 **6.12x - 50.09x** 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](https://github.com/merongivian/feedraptor), [elixir_feed_parser](https://github.com/fdietz/elixir-feed-parser)), FastRSS was sometimes **259.91x** faster and used **5,412,308.17x** less memory _(0.00156 MB vs 8423.70 MB)_.
See full [benchmarks](#benchmark) below:
## Compatibility
FastRSS requires a minimum combination of Elixir 1.6.0 and Erlang/OTP 20.0, and is tested with a maximum combination of Elixir 1.11.1 and Erlang/OTP 22.0.
## Installation
This package is available on [hex](https://hex.pm/packages/fast_rss).
It can be installed by adding `fast_rss` to your list of dependencies in `mix.exs`:
```elixir
def deps do
[
{:fast_rss, "~> 0.5.0"}
]
end
```
You also need the rust compiler installed: https://www.rust-lang.org/tools/install
```bash
curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
```
## Usage
There is only two functions, one for parsing rss `parse_rss/1` and one for parsing atom feeds `parse_atom/1` they takes a string and outputs an `{:ok, map()}` with string keys.
```elixir
iex(1)> {:ok, map_of_rss} = FastRSS.parse_rss("...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](https://hexdocs.pm/fast_rss).
### Supported Feeds
Reading from the following RSS versions is supported:
- RSS 0.90
- RSS 0.91
- RSS 0.92
- RSS 1.0
- RSS 2.0
- iTunes
- Dublin Core
- Atom
## Benchmark
HTML: [https://avencera.github.io/fast_rss/](https://avencera.github.io/fast_rss/)
Benchmark run from 2020-02-22 05:23:47.524699Z UTC
### System
Benchmark suite executing on the following system:
Operating System
macOS
CPU Information
Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
Number of Available Cores
16
Available Memory
32 GB
Elixir Version
1.10.1
Erlang Version
22.2.6
### Configuration
Benchmark suite executing with the following configuration:
:time
30 s
:parallel
1
:warmup
5 s
### Statistics
**Input: anxiety**
Run Time
Name
IPS
Average
Devitation
Median
99th %
fast_rss
188.57
5.30 ms
±8.26%
5.45 ms
6.43 ms
feeder_ex
3.70
269.92 ms
±5.34%
268.12 ms
316.12 ms
feed_raptor
2.99
334.01 ms
±2.44%
331.03 ms
371.28 ms
elixir_feed_parser
1.94
515.72 ms
±1.94%
516.10 ms
536.05 ms
Comparison
Name
IPS
Slower
fast_rss
188.57
feeder_ex
3.70
50.9x
feed_raptor
2.99
62.99x
elixir_feed_parser
1.94
97.25x
Memory Usage
Name
Memory
Factor
fast_rss
0.00156 MB
feeder_ex
17.21 MB
11004.73x
feed_raptor
268.53 MB
171693.91x
elixir_feed_parser
313.30 MB
200316.09x
**Input: ben**
Run Time
Name
IPS
Average
Devitation
Median
99th %
fast_rss
83.95
11.91 ms
±10.29%
12.23 ms
16.17 ms
feeder_ex
13.33
75.04 ms
±4.38%
74.21 ms
89.72 ms
elixir_feed_parser
3.52
284.18 ms
±3.89%
283.83 ms
324.08 ms
feed_raptor
0.48
2078.76 ms
±0.52%
2076.27 ms
2097.44 ms
Comparison
Name
IPS
Slower
fast_rss
83.95
feeder_ex
13.33
6.3x
elixir_feed_parser
3.52
23.86x
feed_raptor
0.48
174.51x
Memory Usage
Name
Memory
Factor
fast_rss
0.00155 MB
feeder_ex
27.86 MB
17990.96x
elixir_feed_parser
163.88 MB
105811.88x
feed_raptor
1577.41 MB
1018492.36x
**Input: daily**
Run Time
Name
IPS
Average
Devitation
Median
99th %
fast_rss
32.98
0.0303 s
±7.62%
0.0313 s
0.0339 s
feeder_ex
4.94
0.20 s
±4.61%
0.199 s
0.24 s
elixir_feed_parser
0.64
1.57 s
±1.50%
1.57 s
1.63 s
feed_raptor
0.127
7.88 s
±0.23%
7.88 s
7.90 s
Comparison
Name
IPS
Slower
fast_rss
32.98
feeder_ex
4.94
6.68x
elixir_feed_parser
0.64
51.86x
feed_raptor
0.127
259.91x
Memory Usage
Name
Memory
Factor
fast_rss
0.00153 MB
feeder_ex
109.73 MB
71555.78x
elixir_feed_parser
880.51 MB
574178.95x
feed_raptor
6386.12 MB
4164382.64x
**Input: dave**
Run Time
Name
IPS
Average
Devitation
Median
99th %
fast_rss
407.08
2.46 ms
±9.83%
2.41 ms
3.16 ms
feeder_ex
56.52
17.69 ms
±6.14%
17.37 ms
22.51 ms
elixir_feed_parser
8.90
112.31 ms
±4.12%
111.93 ms
127.60 ms
feed_raptor
1.59
628.45 ms
±1.60%
626.71 ms
656.74 ms
Comparison
Name
IPS
Slower
fast_rss
407.08
feeder_ex
56.52
7.2x
elixir_feed_parser
8.90
45.72x
feed_raptor
1.59
255.83x
Memory Usage
Name
Memory
Factor
fast_rss
0.00157 MB
feeder_ex
9.25 MB
5886.17x
elixir_feed_parser
80.42 MB
51170.23x
feed_raptor
571.18 MB
363425.45x
**Input: sleepy**
Run Time
Name
IPS
Average
Devitation
Median
99th %
fast_rss
760.30
1.32 ms
±16.62%
1.21 ms
2.03 ms
feeder_ex
124.28
8.05 ms
±6.94%
8.03 ms
10.32 ms
elixir_feed_parser
26.26
38.09 ms
±5.08%
37.81 ms
44.42 ms
feed_raptor
3.21
311.16 ms
±2.85%
307.86 ms
345.09 ms
Comparison
Name
IPS
Slower
fast_rss
760.30
feeder_ex
124.28
6.12x
elixir_feed_parser
26.26
28.96x
feed_raptor
3.21
236.57x
Memory Usage
Name
Memory
Factor
fast_rss
0.00157 MB
feeder_ex
4.28 MB
2726.19x
elixir_feed_parser
35.88 MB
22829.92x
feed_raptor
274.98 MB
174963.99x
**Input: stuff**
Run Time
Name
IPS
Average
Devitation
Median
99th %
fast_rss
19.19
0.0521 s
±9.19%
0.0546 s
0.0635 s
feeder_ex
0.93
1.07 s
±2.49%
1.07 s
1.15 s
elixir_feed_parser
0.53
1.88 s
±1.22%
1.89 s
1.92 s
feed_raptor
0.0797
12.54 s
±1.61%
12.44 s
12.77 s
Comparison
Name
IPS
Slower
fast_rss
19.19
feeder_ex
0.93
20.59x
elixir_feed_parser
0.53
36.11x
feed_raptor
0.0797
240.68x
Memory Usage
Name
Memory
Factor
fast_rss
0.00154 MB
feeder_ex
140.58 MB
91220.55x
elixir_feed_parser
1018.78 MB
661058.28x
feed_raptor
8424.44 MB
5466379.81x
## Deploying
Deploying rust NIFs can be a little bit annoying as you have to install the rust compiler. We try to alleviate this with [`rustler_precopmiled`](https://hexdocs.pm/rustler_precompiled/RustlerPrecompiled.html), which will create precompiled assets for a number of targets (see [`release.yml`](./.github/workflows/release.yml) for the full list), but does not cover all environments. If you are having trouble deploying this package make an issue and I will try and help you out.
I will then add it to the FAQ below.
### Q. How do I deploy using an Alpine Dockerfile?
#### A. I recommend using a [multi-stage Dockerfile](https://docs.docker.com/develop/develop-images/multistage-build/), and doing the following
1. On the stages where you build all your deps, and build your release make sure to install `build-base` and `libgcc`:
```dockerfile
# This step installs all the build tools we'll need
RUN apk update && \
apk upgrade --no-cache && \
apk add --no-cache \
git \
curl \
build-base \
libgcc && \
mix local.rebar --force && \
mix local.hex --force
```
2. Install the rust compiler and allow dynamic linking to the C library by setting the rust flag
```dockerfile
# install rustup
RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
ENV RUSTUP_HOME=/root/.rustup \
RUSTFLAGS="-C target-feature=-crt-static" \
CARGO_HOME=/root/.cargo \
PATH="/root/.cargo/bin:$PATH"
```
3. On the stage where you actually run your elixir release install `libgcc`:
```dockerfile
################################################################################
## STEP 4 - FINAL
FROM alpine:3.11
ENV MIX_ENV=prod
RUN apk update && \
apk add --no-cache \
bash \
libgcc \
openssl-dev
COPY --from=release-builder /opt/built /app
WORKDIR /app
CMD ["/app/my_app/bin/my_app", "start"]
```
## License
FastRSS is released under the Apache License 2.0 - see the [LICENSE](LICENSE) file.