mirror of
https://github.com/lrnselfreliance/wrolpi.git
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8008cd1fd8
COUNT(*) OVER() forced SQLite to visit every matching file_group before LIMIT, which is a full table scan of the (large) file_group table — ~22s cold on a Pi for videos ordered by download date. Count separately and cache for 60s by filters so indexed orders can stop after one page. Past-the-end pages now report the true total. Videos/archives/docs pagers keep totalPages across page changes.
477 lines
16 KiB
Python
477 lines
16 KiB
Python
import html
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import logging
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import pathlib
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import re
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from typing import List, Optional
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from sqlalchemy import asc, desc, func, nullslast, text, column, bindparam, Integer, Float
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from sqlalchemy.orm import Session
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from wrolpi import fts
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from wrolpi.collections.models import Collection
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from wrolpi.collections.types import collection_type_registry
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from wrolpi.db import get_db_session
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from wrolpi.errors import ValidationError
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from wrolpi.files.lib import split_path_stem_and_suffix, get_mimetype, cached_search_total, \
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search_filter_cache_key
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logger = logging.getLogger(__name__)
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# Register author and subject collection types.
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collection_type_registry.register(
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'author',
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lambda n: bool(n and n.strip()),
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'Non-empty author name'
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)
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collection_type_registry.register(
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'subject',
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lambda n: bool(n and n.strip()),
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'Non-empty subject name'
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)
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# Junk author patterns to reject.
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JUNK_AUTHORS = {
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'administrator', 'admin', 'unknown', 'preferred customer', 'user',
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'owner', 'default', 'none', 'n/a', 'na', 'test', 'root',
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}
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JUNK_SUBJECTS = {
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'unknown', 'n/a', 'na', 'none', 'test', 'default',
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}
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# Regex for URL-like strings.
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URL_PATTERN = re.compile(r'https?://|www\.|\.com|\.org|\.net')
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# Matches year ranges like 1483-1546, -1938, 1564-1616.
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YEAR_RANGE_PATTERN = re.compile(r'^-?\d{0,4}-?\d{4}$')
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# Matches bracket suffixes like [from old catalog].
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BRACKET_SUFFIX_PATTERN = re.compile(r'\s*\]?\s*\[.*$')
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# Matches trailing birth-death years like 1843-1920 at end of string.
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TRAILING_YEARS_PATTERN = re.compile(r'\s+\d{4}-\d{4}$')
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# Matches pure numeric/code patterns: 00110001, 062447, 105642-01, 01/2004.
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NUMERIC_CODE_PATTERN = re.compile(r'^\d[\d\-/]*$')
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# Matches date strings like "14 June 2006".
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DATE_STRING_PATTERN = re.compile(r'^\d{1,2}\s+\w+\s+\d{4}$')
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# Matches HTML entities like • or &
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HTML_ENTITY_PATTERN = re.compile(r'&\w+;')
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# Matches initials pattern like J.K. (used to avoid stripping trailing period).
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INITIALS_PATTERN = re.compile(r'\.\w\.')
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def normalize_author(author: str) -> Optional[str]:
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"""Clean an author string before validation."""
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if not author or not author.strip():
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return None
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author = author.strip()
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# Remove bracket suffixes like [from old catalog].
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author = BRACKET_SUFFIX_PATTERN.sub('', author)
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# Strip surrounding quotes.
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if len(author) >= 2 and author[0] == '"' and author[-1] == '"':
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author = author[1:-1]
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# Also strip leading quote left after bracket removal.
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if author.startswith('"'):
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author = author[1:]
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# Remove surrounding parentheses.
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if len(author) >= 2 and author[0] == '(' and author[-1] == ')':
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author = author[1:-1]
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# Remove trailing birth-death years.
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author = TRAILING_YEARS_PATTERN.sub('', author)
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# Strip trailing period, but not if it's part of initials (e.g. J.K.).
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if author.endswith('.') and not INITIALS_PATTERN.search(author):
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author = author[:-1]
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# Strip trailing comma.
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author = author.rstrip(',')
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# Title-case for consistent casing.
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author = author.title()
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author = author.strip()
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return author if author else None
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def normalize_subject(subject: str) -> Optional[str]:
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"""Clean a subject string before validation."""
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if not subject or not subject.strip():
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return None
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subject = subject.strip()
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# Decode HTML entities.
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subject = html.unescape(subject)
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# Title-case for consistent casing.
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subject = subject.title()
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# Truncate to 150 chars.
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if len(subject) > 150:
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subject = subject[:150]
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subject = subject.strip()
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return subject if subject else None
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# Matches pure digits.
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PURE_DIGITS_PATTERN = re.compile(r'^\d+$')
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# Matches any letter character.
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HAS_LETTER_PATTERN = re.compile(r'[a-zA-Z]')
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def is_valid_author(author: str) -> bool:
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"""Check if an author string looks like a real author name."""
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if not author or not author.strip():
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return False
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author = author.strip()
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if len(author) > 100:
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return False
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if len(author) < 2:
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return False
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if author.lower() in JUNK_AUTHORS:
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return False
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if URL_PATTERN.search(author):
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return False
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# Reject pure year ranges and numbers.
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if YEAR_RANGE_PATTERN.match(author):
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return False
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if PURE_DIGITS_PATTERN.match(author):
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return False
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# Reject strings with no letter characters.
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if not HAS_LETTER_PATTERN.search(author):
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return False
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return True
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def is_valid_subject(subject: str) -> bool:
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"""Check if a subject string looks like a real subject."""
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if not subject or not subject.strip():
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return False
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subject = subject.strip()
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if len(subject) < 2:
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return False
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if len(subject) > 150:
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return False
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if subject.lower() in JUNK_SUBJECTS:
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return False
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if URL_PATTERN.search(subject):
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return False
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# Reject pure numeric/code patterns.
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if NUMERIC_CODE_PATTERN.match(subject):
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return False
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# Reject date strings.
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if DATE_STRING_PATTERN.match(subject):
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return False
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# Reject strings with HTML entities.
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if HTML_ENTITY_PATTERN.search(subject):
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return False
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return True
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# Splits multiple authors on common separators.
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AUTHOR_SPLIT_PATTERN = re.compile(r'[;&]|,\s*(?:and|&)\s*|,\s+')
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def split_authors(author_str: str) -> List[str]:
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"""Split an author string that may contain multiple authors."""
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if not author_str:
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return []
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# Split on common separators.
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authors = AUTHOR_SPLIT_PATTERN.split(author_str)
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return [a.strip() for a in authors if a.strip()]
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# Splits multiple subjects on semicolons and bare commas.
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SUBJECT_SPLIT_PATTERN = re.compile(r';|,(?!\s)')
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def split_subjects(subject_str: str) -> List[str]:
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"""Split a subject string that may contain multiple subjects."""
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if not subject_str:
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return []
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# Split on semicolons and bare commas (comma NOT followed by a space).
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subjects = SUBJECT_SPLIT_PATTERN.split(subject_str)
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return [s.strip() for s in subjects if s.strip()]
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def get_or_create_author_collection(session: Session, author_name: str) -> Optional[Collection]:
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"""Find or create a Collection for an author."""
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if not author_name or not author_name.strip():
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return None
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author_name = author_name.strip()
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collection = session.query(Collection).filter(
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func.lower(Collection.name) == author_name.lower(),
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Collection.kind == 'author',
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).first()
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if not collection:
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collection = Collection(name=author_name, kind='author')
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session.add(collection)
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session.flush()
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logger.debug(f'Created author collection: {author_name}')
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return collection
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def get_or_create_subject_collection(session: Session, subject_name: str) -> Optional[Collection]:
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"""Find or create a Collection for a subject."""
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if not subject_name or not subject_name.strip():
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return None
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subject_name = subject_name.strip()
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collection = session.query(Collection).filter(
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func.lower(Collection.name) == subject_name.lower(),
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Collection.kind == 'subject',
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).first()
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if not collection:
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collection = Collection(name=subject_name, kind='subject')
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session.add(collection)
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session.flush()
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logger.debug(f'Created subject collection: {subject_name}')
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return collection
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async def search_authors_by_name(session: Session, name: str, limit: int = 5) -> List[dict]:
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"""Search for author collections by partial name."""
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collections = session.query(Collection) \
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.filter(Collection.kind == 'author') \
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.filter(Collection.name.ilike(f'%{name}%')) \
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.order_by(asc(Collection.name)) \
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.limit(limit) \
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.all()
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return [{'id': c.id, 'name': c.name} for c in collections]
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async def search_subjects_by_name(session: Session, name: str, limit: int = 5) -> List[dict]:
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"""Search for subject collections by partial name."""
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collections = session.query(Collection) \
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.filter(Collection.kind == 'subject') \
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.filter(Collection.name.ilike(f'%{name}%')) \
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.order_by(asc(Collection.name)) \
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.limit(limit) \
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.all()
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return [{'id': c.id, 'name': c.name} for c in collections]
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def discover_calibre_cover(ebook_path: pathlib.Path):
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"""Calibre puts a cover file in a directory which contains only one ebook (but multiple formats of the ebook),
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this function will return the path of the cover if the ebook_path is in such a situation."""
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if not ebook_path.is_file():
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raise ValueError(f'Invalid ebook path {ebook_path}')
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paths = list(ebook_path.parent.iterdir())
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ebook_path_stem, _ = split_path_stem_and_suffix(ebook_path)
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cover = None
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for path in paths:
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stem, suffix = split_path_stem_and_suffix(path)
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if path.is_dir():
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# We don't care about sub directories.
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continue
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if stem == ebook_path_stem:
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# This is one of the formats of the ebook.
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continue
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if path.name == 'metadata.opf':
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# Metadata, this is expected in a Calibre book directory.
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continue
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if stem == 'cover' and get_mimetype(path).startswith('image/'):
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# Discovered the cover.
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cover = path
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continue
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# Some file that does not match the ebook stem, metadata, or cover. This must not be a Calibre book directory.
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return None
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return cover
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def get_statistics() -> dict:
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"""Get doc statistics."""
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from .models import Doc
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from wrolpi.files.models import FileGroup
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with get_db_session() as session:
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total = session.query(func.count(Doc.id)).scalar() or 0
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total_size = session.query(func.sum(Doc.size)).scalar() or 0
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epub_count = session.query(func.count(Doc.id)).join(FileGroup).filter(
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FileGroup.mimetype.startswith('application/epub')).scalar() or 0
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pdf_count = session.query(func.count(Doc.id)).join(FileGroup).filter(
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FileGroup.mimetype == 'application/pdf').scalar() or 0
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author_count = session.query(func.count(Collection.id)).filter(
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Collection.kind == 'author').scalar() or 0
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subject_count = session.query(func.count(Collection.id)).filter(
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Collection.kind == 'subject').scalar() or 0
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return dict(statistics=dict(
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doc_count=total,
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epub_count=epub_count,
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pdf_count=pdf_count,
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other_count=total - epub_count - pdf_count,
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total_size=total_size,
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author_count=author_count,
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subject_count=subject_count,
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))
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def _doc_response(doc) -> dict:
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"""Build a JSON response dict for a Doc."""
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file_group = doc.file_group.__json__()
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return {
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'file_group': file_group,
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'doc': {
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'id': doc.id,
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'publisher': doc.publisher,
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'language': doc.language,
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'page_count': doc.page_count,
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'subject': doc.subject,
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'description': doc.description,
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'size': doc.size,
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}
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}
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def _get_doc(session, file_group_id: int):
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from .models import Doc
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doc = session.query(Doc).filter_by(file_group_id=file_group_id).one_or_none()
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if not doc:
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raise ValidationError(f'Doc with file_group_id {file_group_id} not found')
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return doc
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def _search_docs(search_str=None, author=None, subject=None, language=None, mimetype=None,
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limit=20, offset=0, order_by='published_datetime', tag_names=None, deep=False):
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from .models import Doc
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from wrolpi.files.models import FileGroup
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# Deep search matches all FTS columns (including d_text, the document contents); the default matches only
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# the much smaller a/b/c columns.
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match = fts.translate_websearch(search_str, None if deep else fts.ABC_COLUMNS) if search_str else None
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with get_db_session() as session:
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query = session.query(FileGroup).join(Doc, Doc.file_group_id == FileGroup.id)
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fts_sq = None
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if match is not None:
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fts_sq = text('SELECT rowid AS id, -rank AS ts_rank'
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' FROM file_group_fts WHERE file_group_fts MATCH :fts_match') \
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.bindparams(fts_match=match) \
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.columns(column('id', Integer), column('ts_rank', Float)) \
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.alias('fts')
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query = query.join(fts_sq, fts_sq.c.id == FileGroup.id)
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if author:
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query = query.filter(FileGroup.b_text.ilike(f'%{author}%'))
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if subject:
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query = query.filter(Doc.subject.ilike(f'%{subject}%'))
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if language:
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query = query.filter(Doc.language == language)
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if mimetype:
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query = query.filter(FileGroup.mimetype.startswith(mimetype))
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if tag_names:
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from wrolpi.tags import Tag, TagFile
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tagged_fg_ids = session.query(TagFile.file_group_id) \
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.join(Tag, Tag.id == TagFile.tag_id) \
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.filter(Tag.name.in_(tag_names)) \
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.subquery()
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query = query.filter(FileGroup.id.in_(tagged_fg_ids))
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unfiltered = not (search_str or author or subject or language or mimetype or tag_names)
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if unfiltered:
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total = cached_search_total(
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search_filter_cache_key('docs'),
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lambda: session.query(func.count(Doc.id)).scalar() or 0,
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)
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else:
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cache_key = search_filter_cache_key(
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'docs', search_str=search_str, author=author, subject=subject,
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language=language, mimetype=mimetype, tag_names=tag_names, deep=deep,
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)
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# Count before ORDER BY / LIMIT; cache by filters not page.
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total = cached_search_total(cache_key, lambda q=query: q.count())
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# Ordering.
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if order_by == 'rank' and fts_sq is not None:
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query = query.order_by(
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desc(fts_sq.c.ts_rank),
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desc(FileGroup.id),
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)
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elif order_by == 'published_datetime':
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query = query.order_by(nullslast(desc(FileGroup.published_datetime)), desc(FileGroup.id))
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elif order_by == 'size':
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query = query.order_by(nullslast(desc(Doc.size)))
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elif order_by == 'title':
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query = query.order_by(nullslast(asc(FileGroup.a_text)))
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else:
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query = query.order_by(desc(FileGroup.id))
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file_groups = query.offset(offset).limit(limit).all()
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fg_ids = [fg.id for fg in file_groups]
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results = [fg.__json__() for fg in file_groups]
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if search_str and fg_ids:
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hints = _fetch_section_hints(session, fg_ids, search_str)
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for r in results:
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hint = hints.get(r['id'])
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if hint:
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r['section_hint'] = hint
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return results, total
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def _fetch_section_hints(session, file_group_ids, search_str):
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"""For each matching Doc, return the best-ranking DocSection for `search_str`.
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Returns a mapping of file_group_id -> {kind, ordinal, label, snippet}.
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"""
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if not file_group_ids:
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return {}
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match = fts.translate_websearch(search_str)
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if match is None:
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return {}
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# FTS5 auxiliary functions (snippet, rank) must be evaluated in the innermost SELECT that scans the
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# FTS table; the window function must live in a separate outer layer.
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sql = text('''
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SELECT fg_id, kind, ordinal, label, snippet FROM (
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SELECT fg_id, kind, ordinal, label, snippet,
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row_number() OVER (PARTITION BY fg_id
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ORDER BY fts_rank ASC, ordinal ASC) AS rn
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FROM (
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SELECT d.file_group_id AS fg_id,
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ds.kind AS kind,
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ds.ordinal AS ordinal,
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ds.label AS label,
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snippet(doc_section_fts, 0, '[[WROLPI_HL]]', '[[/WROLPI_HL]]', '…', 20) AS snippet,
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doc_section_fts.rank AS fts_rank
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FROM doc_section_fts
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JOIN doc_section ds ON ds.id = doc_section_fts.rowid
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JOIN doc d ON d.id = ds.doc_id
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WHERE doc_section_fts MATCH :q AND d.file_group_id IN :ids
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)
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) WHERE rn = 1
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''').bindparams(bindparam('ids', expanding=True))
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rows = session.execute(sql, {'q': match, 'ids': list(file_group_ids)}).fetchall()
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hints = {}
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for row in rows:
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hints[row['fg_id']] = {
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'kind': row['kind'],
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'ordinal': row['ordinal'],
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'label': row['label'],
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'snippet': row['snippet'],
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}
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return hints
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