mirror of
https://github.com/paperless-ngx/paperless-ngx.git
synced 2025-04-02 13:45:10 -05:00
123 lines
3.5 KiB
Python
123 lines
3.5 KiB
Python
import logging
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from contextlib import contextmanager
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from whoosh import highlight
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from whoosh.fields import Schema, TEXT, NUMERIC
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from whoosh.highlight import Formatter, get_text
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from whoosh.index import create_in, exists_in, open_dir
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from whoosh.qparser import MultifieldParser
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from whoosh.writing import AsyncWriter
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from paperless import settings
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logger = logging.getLogger(__name__)
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class JsonFormatter(Formatter):
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def __init__(self):
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self.seen = {}
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def format_token(self, text, token, replace=False):
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seen = self.seen
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ttext = self._text(get_text(text, token, replace))
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if ttext in seen:
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termnum = seen[ttext]
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else:
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termnum = len(seen)
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seen[ttext] = termnum
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return {'text': ttext, 'term': termnum}
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def format_fragment(self, fragment, replace=False):
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output = []
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index = fragment.startchar
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text = fragment.text
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for t in fragment.matches:
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if t.startchar is None:
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continue
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if t.startchar < index:
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continue
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if t.startchar > index:
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output.append({'text': text[index:t.startchar]})
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output.append(self.format_token(text, t, replace))
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index = t.endchar
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if index < fragment.endchar:
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output.append({'text': text[index:fragment.endchar]})
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return output
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def format(self, fragments, replace=False):
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output = []
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for fragment in fragments:
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output.append(self.format_fragment(fragment, replace=replace))
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return output
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def get_schema():
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return Schema(
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id=NUMERIC(stored=True, unique=True, numtype=int),
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title=TEXT(stored=True),
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content=TEXT(),
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correspondent=TEXT(stored=True)
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)
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def open_index(recreate=False):
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if exists_in(settings.INDEX_DIR) and not recreate:
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return open_dir(settings.INDEX_DIR)
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else:
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# TODO: this is not thread safe. If 2 instances try to create the index
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# at the same time, this fails. This currently prevents parallel
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# tests.
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return create_in(settings.INDEX_DIR, get_schema())
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def update_document(writer, doc):
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logger.debug("Indexing {}...".format(doc))
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writer.update_document(
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id=doc.pk,
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title=doc.title,
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content=doc.content,
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correspondent=doc.correspondent.name if doc.correspondent else None
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)
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def remove_document(writer, doc):
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logger.debug("Removing {} from index...".format(doc))
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writer.delete_by_term('id', doc.pk)
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def add_or_update_document(document):
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ix = open_index()
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with AsyncWriter(ix) as writer:
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update_document(writer, document)
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def remove_document_from_index(document):
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ix = open_index()
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with AsyncWriter(ix) as writer:
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remove_document(writer, document)
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@contextmanager
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def query_page(ix, query, page):
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searcher = ix.searcher()
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try:
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query_parser = MultifieldParser(["content", "title", "correspondent"],
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ix.schema).parse(query)
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result_page = searcher.search_page(query_parser, page)
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result_page.results.fragmenter = highlight.ContextFragmenter(
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surround=50)
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result_page.results.formatter = JsonFormatter()
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yield result_page
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finally:
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searcher.close()
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def autocomplete(ix, term, limit=10):
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with ix.reader() as reader:
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terms = []
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for (score, t) in reader.most_distinctive_terms("content", limit, term.lower()):
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terms.append(t)
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return terms
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