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125 lines
4.3 KiB
Python
125 lines
4.3 KiB
Python
import json
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from datetime import timedelta
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import flask as flask
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from common import dateutil, database
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from dateutil.parser import ParserError
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from flask import request, jsonify, Response, render_template
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app = flask.Flask('buscribe')
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@app.template_filter()
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def convert_vtt_timedelta(delta: timedelta):
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return f'{delta.days * 24 + delta.seconds // 3600:02}:{(delta.seconds % 3600) // 60:02}:{delta.seconds % 60:02}.{delta.microseconds // 1000:03}'
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def round_bus_time(delta: timedelta):
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"""Round bus time down to the second."""
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return f'{delta.days * 24 + delta.seconds // 3600:02}:{(delta.seconds % 3600) // 60:02}:{delta.seconds % 60:02}'
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@app.route('/buscribe/vtt')
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def get_vtt():
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"""Returns WebVTT subtitle file for the period between start_time and end_time.
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Times are relative to --bustime-start.
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TODO: Figure out proper offsets."""
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try:
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start_time_string = request.args.get('start_time')
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start_time = dateutil.parse(start_time_string)
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except ParserError:
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return "Invalid start time!", 400
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except KeyError:
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return "Missing start time!", 400
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try:
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end_time_string = request.args['end_time']
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end_time = dateutil.parse(end_time_string)
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except ParserError:
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return "Invalid end time!", 400
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except KeyError:
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return "Missing end time!", 400
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db_conn = app.db_manager.get_conn()
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results = fetch_lines(db_conn, start_time, end_time)
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return Response(
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render_template("busubs.jinja", results=results, bustime_start=app.bustime_start,
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duration_extend=timedelta(seconds=0.3)),
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mimetype="text/vtt"
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)
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@app.route('/buscribe/json')
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def get_json():
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"""Searches the line database for *query*, with optional start_time and end_time boundaries.
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Search is done using PostgreSQL websearch_to_tsquery()
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(https://www.postgresql.org/docs/13/functions-textsearch.html)"""
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start_time_string = request.args.get('start_time')
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if start_time_string is not None:
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try:
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start_time = dateutil.parse(start_time_string)
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except ParserError:
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return "Invalid start time!", 400
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else:
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start_time = None
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end_time_string = request.args.get('end_time')
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if end_time_string is not None:
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try:
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end_time = dateutil.parse(end_time_string)
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except ParserError:
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return "Invalid end time!", 400
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else:
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end_time = None
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# I think websearch_to_tsquery() sanitizes its own input.
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query = request.args.get('query', default=None)
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limit = request.args.get('limit', default=None, type=int)
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offset = request.args.get('offset', default=None, type=int)
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db_conn = app.db_manager.get_conn()
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results = fetch_lines(db_conn, start_time, end_time, query, limit, offset)
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return jsonify([{"id": row.id,
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"start_time": row.start_time.isoformat(),
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"start_bus_time": round_bus_time(row.start_time - app.bustime_start),
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"end_time": row.end_time.isoformat(),
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"end_bus_time": round_bus_time(row.start_time - app.bustime_start),
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"verifier": row.verifier,
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"text": row.transcription_line} for row in results])
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def fetch_lines(db_conn, start_time, end_time, ts_query=None, limit=None, offset=None):
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query = "SELECT * FROM buscribe_all_transcriptions WHERE start_time > %(start_time)s AND end_time < %(end_time)s "
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if ts_query is not None:
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query += "AND transcription_line_ts @@ (websearch_to_tsquery(%(text_query)s)::text ||':*')::tsquery " \
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"ORDER BY ts_rank_cd(transcription_line_ts, (websearch_to_tsquery(%(text_query)s)::text ||':*')::tsquery) DESC, " \
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"start_time"
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else:
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query += "ORDER BY start_time"
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if limit is not None:
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query += "LIMIT %(limit)s"
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if offset is not None:
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query += "OFFSET %(limit)s"
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query += ";"
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return database.query(db_conn, query,
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start_time=start_time if start_time is not None else '-infinity',
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end_time=end_time if end_time is not None else 'infinity',
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text_query=ts_query,
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limit=limit,
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offset=offset
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)
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