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import feedparser
import requests
import calendar
import io
import pathlib
import sqlite3
import time
import typing
class FeedAlreadyAddedError(Exception):
pass
class FeedFetchError(Exception):
def __init__(self, feed_source: str, status_code: int):
super().__init__(f"Get {feed_source} returned HTTP {status_code}")
class SqliteMissingForeignKeySupportError(Exception):
pass
class TagRss:
def __init__(self, *, storage_path: str | pathlib.Path):
self.connection: sqlite3.Connection = sqlite3.connect(storage_path)
with self.connection:
with open("setup.sql", "r") as setup_script:
self.connection.executescript(setup_script.read())
if (1,) not in self.connection.execute("PRAGMA foreign_keys;").fetchmany(1):
raise SqliteMissingForeignKeySupportError
def add_feed(self, feed_source: str, tags: list[str]) -> None:
response = requests.get(feed_source)
if response.status_code != requests.codes.ok:
raise FeedFetchError(feed_source, response.status_code)
try:
base: str = response.headers["Content-Location"]
except KeyError:
base: str = feed_source
parsed = feedparser.parse(
io.BytesIO(bytes(response.text, encoding="utf-8")),
response_headers={"Content-Location": base},
)
with self.connection:
feed_title: str = parsed.feed.get("title", "")
try:
self.connection.execute(
"INSERT INTO feeds(source, title) VALUES(?, ?);",
(feed_source, feed_title),
) # Note: ensure no more INSERTs between this and the last_insert_rowid() call
except sqlite3.IntegrityError:
raise FeedAlreadyAddedError
feed_id: int = int(
self.connection.execute("SELECT last_insert_rowid();").fetchone()[0]
)
self.connection.executemany(
"INSERT INTO feed_tags(feed_id, tag) VALUES(?, ?);",
((feed_id, tag) for tag in tags),
)
self.store_feed_entries(feed_id, parsed)
def get_entries(self, *, limit: int) -> list[dict[str, typing.Any]]:
with self.connection:
resp = self.connection.execute(
"SELECT feed_id, title, link, epoch_published, epoch_updated FROM entries \
ORDER BY epoch_stored DESC LIMIT ?;",
(limit,),
).fetchall()
entries = []
for entry in resp:
entries.append(
{
"feed_id": entry[0],
"title": entry[1],
"link": entry[2],
"epoch_published": entry[3],
"epoch_updated": entry[4],
}
)
return entries
def get_feed_source(self, feed_id: int) -> str:
with self.connection:
return self.connection.execute(
"SELECT source FROM feeds WHERE id = ?;", (feed_id,)
).fetchone()[0]
def get_feed_title(self, feed_id: int) -> str:
with self.connection:
return self.connection.execute(
"SELECT title FROM feeds WHERE id = ?;", (feed_id,)
).fetchone()[0]
def get_feed_tags(self, feed_id: int) -> list[str]:
with self.connection:
return [
t[0]
for t in self.connection.execute(
"SELECT tag FROM feed_tags WHERE feed_id = ?;", (feed_id,)
).fetchall()
]
def set_feed_source(self, feed_id: int, feed_source: str):
with self.connection:
self.connection.execute(
"UPDATE feeds SET source = ? WHERE id = ?;", (feed_source, feed_id)
)
def set_feed_title(self, feed_id: int, feed_title: str):
with self.connection:
self.connection.execute(
"UPDATE feeds SET title = ? WHERE id = ?;", (feed_title, feed_id)
)
def set_feed_tags(self, feed_id: int, feed_tags: list[str]):
with self.connection:
self.connection.execute(
"DELETE FROM feed_tags WHERE feed_id = ?;", (feed_id,)
)
self.connection.executemany(
"INSERT INTO feed_tags(feed_id, tag) VALUES(?, ?);",
((feed_id, tag) for tag in feed_tags),
)
def delete_feed(self, feed_id: int) -> None:
with self.connection:
self.connection.execute("DELETE FROM feeds WHERE id = ?;", (feed_id,))
def fetch_all_new_feed_entries(self) -> None:
with self.connection:
resp = self.connection.execute("SELECT id, source FROM feeds;")
while True:
row = resp.fetchone()
if not row:
break
feed_id = row[0]
feed_source = row[1]
response = requests.get(feed_source)
if response.status_code != requests.codes.ok:
continue # TODO: log this somehow
try:
base: str = response.headers["Content-Location"]
except KeyError:
base: str = feed_source
parsed = feedparser.parse(
io.BytesIO(bytes(response.text, encoding="utf-8")),
response_headers={"Content-Location": base},
)
self.store_feed_entries(feed_id, parsed)
def store_feed_entries(self, feed_id: int, parsed_feed):
for entry in reversed(parsed_feed.entries):
link: str = entry.get("link", None)
title: str = entry.get("title", None)
try:
epoch_published: typing.Optional[int] = calendar.timegm(
entry.get("published_parsed", None)
)
except TypeError:
epoch_published = None
try:
epoch_updated: typing.Optional[int] = calendar.timegm(
entry.get("updated_parsed", None)
)
except TypeError:
epoch_updated = None
with self.connection:
self.connection.execute(
"INSERT INTO entries(feed_id, title, link, epoch_published, epoch_updated, epoch_stored) \
VALUES(?, ?, ?, ?, ?, ?);",
(
feed_id,
title,
link,
epoch_published,
epoch_updated,
int(time.time()),
),
)
def close(self) -> None:
with self.connection:
self.connection.executescript(
"""
PRAGMA analysis_limit=1000;
PRAGMA optimize;
"""
)
self.connection.close()
|
