1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
|
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:
self.connection.executescript(
"""
PRAGMA foreign_keys = ON;
CREATE TABLE IF NOT EXISTS
feeds(
id INTEGER PRIMARY KEY,
source TEXT UNIQUE,
title TEXT
) STRICT;
CREATE TABLE IF NOT EXISTS
feed_tags(
feed_id INTEGER REFERENCES feeds(id) ON DELETE CASCADE,
tag TEXT
) STRICT;
CREATE INDEX IF NOT EXISTS idx_feed_tags__feed_id__tag ON feed_tags(feed_id, tag);
CREATE INDEX IF NOT EXISTS idx_feed_tags__tag__feed_id ON feed_tags(tag, feed_id);
CREATE TABLE IF NOT EXISTS
entries(
id INTEGER PRIMARY KEY,
feed_id INTEGER REFERENCES feeds(id) ON DELETE CASCADE,
title TEXT,
link TEXT,
epoch_published INTEGER,
epoch_updated INTEGER,
epoch_downloaded INTEGER
) STRICT;
CREATE INDEX IF NOT EXISTS idx_entries__epoch_downloaded ON entries(epoch_downloaded);
"""
)
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),
)
for entry in reversed(parsed.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
self.connection.execute(
"INSERT INTO entries(feed_id, title, link, epoch_published, epoch_updated, epoch_downloaded) \
VALUES(?, ?, ?, ?, ?, ?);",
(
feed_id,
title,
link,
epoch_published,
epoch_updated,
int(time.time()),
),
)
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_downloaded 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 close(self) -> None:
with self.connection:
self.connection.execute("PRAGMA optimize;")
self.connection.close()
|
