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Total rewrite of singlerss, better and better than before!

Signed-off-by: Dom Rodriguez <shymega@shymega.org.uk>
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Dom Rodriguez 2020-08-18 00:24:10 +01:00
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SINGLERSS_FEED_OUT_PATH=
SINGLERSS_FEED_LIST_PATH=
SINGLERSS_FEED_OUT_TYPE=

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/.env

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singlerss
=========
# Description
singlerss combines all feeds described in a OPML file into one feed. This can
either be outputted into `stdout` or a file, as specifed by program arguments,
and configured by the environment variables.
# Configuration
SingleRSS is configured by environment variables.
See `.env.sample`. You _must_ copy `.env.sample` to `.env`.
`SINGLERSS_FEED_OUT_PATH` defines the relative OR absolute path to output the
feed to, _IF_ `SINGLERSS_FEED_OUT_TYPE` is set to `file`. If
`SINGLERSS_FEED_OUT_TYPE` is set to `stdout`, you must redirect output to the
file you want it written to.
`SINGLERSS_FEED_LIST_PATH` must be set to the input list of feeds you want to be
collated into one feed. This _must_ be a newline delimited file of URLs.
## Running
You may run this directly, after sourcing `.env` and exporting the variables,
with `./singlerss.py`. Alternatively, I have provided a systemd unit and timer,
which I will offer support for, and a basic crontab. I do not use cron, so I
cannot offer support for it.
# Licensing
This program is [licensed][license] under the Apache License 2.0.
Copyright (c) Dom Rodriguez (shymega) 2020.
[license]: /LICENSE

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feedgen==0.9.0
feedparser==5.2.1
lxml==4.5.2
python-dateutil==2.8.1
six==1.15.0

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# For stdout to file
0 * * * * cd /opt/rss && . ./.env && /opt/rss/singlerss.py > /var/www/html/feeds.xml
# For file direct.
0 * * * * cd /opt/rss && . ./.env && /opt/rss/singlerss.py

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[Unit]
Description=Generate combined RSS feed.
[Service]
Type=oneshot
# Make sure to set user and group
# to your setup.
User=nginx
Group=nobody
# Make sure to customise these to your
# system!
WorkingDirectory=/var/www/html/feed.xml
# And this.
EnvironmentFile=/opt/singlerss/.env
# And this.
ExecStart=/opt/rss/singlerss.py
# These don't work on older systemd versions.
# In that case, you should configure singlerss
# to output to file, as documented in the README,
# and comment these directives out.
StandardInput=null
StandardError=journal
StandardOutput=file:$SINGLERSS_FEED_OUT_PATH

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[Unit]
Description=Hourly refresh of singlerss
[Timer]
OnCalendar=hourly
[Install]
WantedBy=timers.target

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#!/usr/bin/env python3
# Copyright (c) Dom Rodriguez 2020
# Licensed under the Apache License 2.0
import os
import sys
import feedparser
import listparser
import logging
from feedgen.feed import FeedGenerator
log = None
fg = None
FEED_OUT_PATH = None
FEED_OUT_TYPE = None
FEED_LIST_PATH = None
FEEDS = []
def setup_logging() -> None:
"""
This function intiialises the logger framework.
"""
global log
log = logging.getLogger("singlerss")
out_handler = logging.StreamHandler(sys.stderr)
out_handler.setFormatter(
logging.Formatter(
'%(asctime)s %(name)-12s %(levelname)-8s %(message)s'
))
log.addHandler(out_handler)
log.setLevel(logging.ERROR)
return None
def init_feed() -> None:
"""
This function initialises the RSS feed with the
correct attributes.
"""
log.debug("Initialising the feed...")
global fg
try:
fg = FeedGenerator()
# Setup [root] feed attributes
fg.id("https://rss.shymega.org.uk/feed.xml")
fg.title("SingleRSS - Combined Feed")
fg.generator("SingleRSS/v1.0.0")
fg.link(href="https:/rss.shymega.org.uk/feed.xml", rel="self")
fg.subtitle("Combined feed for RSS feeds")
fg.language('en')
except:
log.error("Error initialising the feed!")
sys.exit(1)
log.debug("Feed initialised!")
return None
def parse_rss_feed(url) -> feedparser.FeedParserDict:
log.debug("Parsing RSS feed..")
try:
# Hopefully this should parse..
return feedparser.parse(url)
except Exception:
log.warninging("Failed to parse RSS feed.")
# Now, we could handle gracefully.
# This code is a WIP, but maybe we shouldn't crash?
log.warninging("Cannot continue, we want all the feeds to work!")
sys.exit(1)
def main():
log.debug("Loading feed list into memory..")
feeds = None
with open(FEED_LIST_PATH, "r") as infile:
feeds = infile.read().splitlines()
log.debug("Iterating over feed list..")
for feed in feeds:
FEEDS.append(feed)
log.debug("Iterating over [input] feeds...")
for feed in FEEDS:
rss = parse_rss_feed(feed)
entries = rss.get("entries")
log.debug("Iterating over [input] feed entries..")
for entry in entries:
log.debug("New feed entry created.")
fe = fg.add_entry()
log.debug("Working on new feed entry..")
try:
fe.id(entry["id"])
except:
# Deifnitely weird...
log.warning("Empty id attribute, defaulting..")
fe.id("about:blank")
try:
fe.title(entry["title"])
except:
# OK, this is a definite malformed feed!
log.warning("Empty title attribute, defaulting..")
fe.title("Unspecified")
try:
fe.link(href=entry["link"])
except:
# When we have a empty link attribute, this isn't ideal
# to set a default value.. :/
log.warning("Empty link attribute, defaulting..")
fe.link(href='about:blank')
try:
if entry["sources"]["authors"]:
for author in entry["sources"]["authors"]:
fe.author(author)
elif entry["authors"]:
try:
for author in entry["authors"]:
fe.author(author)
except:
log.debug("Oh dear, a malformed feed! Adjusting.")
# This is a ugly hack to fix broken feed entries with the author attribute!
author["email"] = author.pop("href")
fe.author(author)
except:
# Sometimes we don't have ANY author attributes, so we
# have to set a dummy attribute.
log.warning("Empty authors attribute, defaulting..")
fe.author({"name": "Unspecified",
"email": "unspecified@example.com"})
try:
if entry["summary"]:
fe.summary(entry["summary"])
fe.description(entry["summary"])
elif entry["description"]:
fe.description(entry["description"])
fe.summary(entry["description"])
fe.content(entry["description"])
except:
# Sometimes feeds don't provide a summary OR description, so we
# have to set an empty value.
# This is pretty useless for a feed, so hopefully we
# don't have to do it often!
log.warning(
"Empty description OR summary attribute, defaulting..")
fe.description("Unspecified")
fe.summary("Unspecified")
try:
if entry["published"]:
try:
fe.published(entry["published"])
fe.updated(entry["published"])
except:
fe.published("1970-01/01T00:00:00+00:00")
fe.updated("1970-01/01T00:00:00+00:00")
continue
except:
# Sometimes feeds don't even provide a publish date, so we default to
# the start date &time of the Unix epoch.
log.warning("Empty publish attribute, defaulting..")
fe.published("1970-01/01T00:00:00+00:00")
fe.updated("1970-01/01T00:00:00+00:00")
if __name__ == "__main__":
setup_logging()
log.debug("Initialising...")
log.debug("Assiging variables..")
try:
# Configuration is specified with environemnt variables.
log.debug("Assignment attempt: SINGLERSS_FEED_OUT_PATH")
FEED_OUT_PATH = os.environ["SINGLERSS_FEED_OUT_PATH"]
except KeyError:
log.error("*** Environment variable missing! ***")
log.error("`SINGLERSS_FEED_OUT_PATH` variable missing.")
log.error("This program will NOT run without that set.")
sys.exit(1)
try:
FEED_LIST_PATH = os.environ["SINGLERSS_FEED_LIST_PATH"]
except:
log.error("*** Environment variable missing! ***")
log.error("`SINGLERSS_FEED_LIST_PATH` variable missing.")
sys.exit(1)
try:
FEED_OUT_TYPE = os.environ["SINGLERSS_FEED_OUT_TYPE"]
except KeyError:
log.error("*** Environment variable missing! ***")
log.error("`SINGLERSS_FEED_OUT_TYPE` variable missing.")
log.error("This program will NOT run without that set.")
sys.exit(1)
log.debug("Begin initialising variables..")
init_feed()
log.debug("Begin processing feeds...")
main()
if FEED_OUT_TYPE == "stdout":
log.debug("stdout output specified, outputting to stdout.")
print(fg.rss_str().decode('utf-8'))
elif FEED_OUT_TYPE == "file":
log.debug("File output specified, outputting to specified file..")
fg.rss_file(FEED_OUT_PATH)
else:
log.error("Unknown type of output preference, cannot run.")
sys.exit(1)