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main.py
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main.py
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from collections import abc
import csv
import flask
import gzip
import io
import pathlib
import sqlite3
import typing
import templates
app = flask.Flask(__name__)
DATA_DIR = pathlib.Path('./data')
default_checked_waypoint_types = {
'Boundary',
'Bridge',
'Campground',
'Highway Jct',
'Interstate Jct',
'Lake',
'Landmark',
'Railroad Jct',
'Trailhead',
'Tunnel',
'Water',
}
def get_db() -> sqlite3.Connection:
db = getattr(flask.g, '_database', None)
if db is None:
uri = f'file:{DATA_DIR / "trail.db"}?mode=ro'
db = flask.g._database = sqlite3.connect(uri, uri=True)
return db
@app.teardown_appcontext
def close_connection(exception):
_ = exception
db = getattr(flask.g, '_database', None)
if db is not None:
db.close()
class Point(typing.NamedTuple):
lon: str
lat: str
ele: str
class Waypoint(typing.NamedTuple):
name: str
type: str
comment: str
lon: str
lat: str
ele: str
def style(self) -> str:
# style for KML
return 'Water' if self.type == 'Water' else 'Other'
class Passage(typing.NamedTuple):
passage: str
name: str
fname: str
def formatted_name(self) -> str:
return (
f'{self.passage.lstrip("0")}: {self.name}'
if self.passage
else self.name
)
def style(self) -> str:
# style for KML
try:
i = int(self.passage)
except ValueError:
return 'PA'
if i == flagstaff_passage:
return 'PA'
elif i < flagstaff_passage:
return 'P1' if i % 2 == 1 else 'P2'
else:
return 'P1' if i % 2 == 0 else 'P2'
def track(self) -> abc.Iterator[Point]:
with (DATA_DIR / self.fname).open('r') as f:
for row in csv.reader(f):
yield Point(*row)
def waypoints(self, allow_types: set[str]) -> abc.Iterator[Waypoint]:
if not self.passage:
return
for (
type,
name,
notes,
comment,
ata_num,
lon,
lat,
ele,
) in get_db().execute(
"""SELECT type, name, notes, comment, ata_num, lon, lat, ele FROM waypoints
WHERE passage = ?""",
(self.passage,),
):
if not type in allow_types:
continue
# The following is an attempt to filter out waypoints with low
# significance (example: junction with unnamed 2 track), and to
# create better names and description.
if type == 'Trailhead':
name = name + ' Trailheaad'
elif type in ('Road Jct', 'Highway Jct', 'Interstate Jct'):
if not name or name == 'RJ':
continue
name = f'RJ {name}'
elif type == 'Trail Jct':
if not name:
continue
name = f'TJ {name}'
elif type == 'Water':
name, _, _ = name.partition('&')
name = f'{name} {notes}'.strip()
elif type == 'Milepost':
name = ata_num
elif type == 'Landmark':
pass
else:
name = comment
if not name:
continue
comment = comment.removeprefix(name)
yield Waypoint(
type=type,
name=name,
comment=comment,
lon=lon,
lat=lat,
ele=ele,
)
@app.route('/download')
def download():
args = flask.request.args
allowed_waypoint_types = set(
waypoint_types[i]
for i in args.getlist('wp', type=int)
if i >= 0 and i < len(waypoint_types)
)
fmt_templates = dict(gpx=templates.gpx, kml=templates.kml)
fmt = args.get('format', default='gpx')
if fmt not in fmt_templates:
flask.abort(400, description='Invalid format')
start = args.get('start', type=int, default=1)
if start < 1 or start > max_passage:
flask.abort(400, description='Invalid passsage')
end = args.get('end', type=int, default=0)
if end <= 0:
end = start - end
elif end < start:
end = start
passages = [
Passage(passage=passage, name=name, fname=fname)
for passage, name, fname in get_db().execute(
"""SELECT passage, name, fname FROM passages
WHERE
passage GLOB '[0-9][0-9]'
AND CAST(passage as INTEGER) >= ?
AND CAST(passage as INTEGER) <= ?
ORDER BY passage
""",
(start, end),
)
]
if len(passages) > max_passage:
name = 'AZT'
stem = 'azt'
elif len(passages) == 1:
name = f'AZT {passages[0].formatted_name()}'
stem = f'passage-{passages[0].passage}'
else:
name = f'AZT Passages {passages[0].passage} - {passages[-1].passage}'
stem = f'passage-{passages[0].passage}-{passages[-1].passage}'
out = io.BytesIO()
gz = gzip.open(out, encoding='utf-8', mode='wt')
fmt_templates[fmt](
gz.write,
name=name,
passages=passages,
allowed_waypoint_types=allowed_waypoint_types,
)
gz.close()
return flask.Response(
out.getvalue(),
mimetype='text/xml',
headers={
'Content-Disposition': f'attachment; filename="{stem}.{fmt}"',
'Content-Encoding': 'gzip',
},
)
@app.route('/')
def root():
# index, name, checked
waypoints = [
(
i,
name,
name in default_checked_waypoint_types,
)
for i, name in enumerate(waypoint_types)
]
passages = [
Passage(passage=passage, name=name, fname='')
for passage, name in get_db().execute(
"""SELECT passage, name FROM passages
WHERE passage GLOB '[0-9][0-9]'
ORDER BY passage"""
)
]
out = io.StringIO()
templates.index(out.write, passages, waypoints)
return out.getvalue()
with app.app_context():
waypoint_types: list[str] = [
r[0]
for r in get_db().execute(
'SELECT DISTINCT type FROM waypoints ORDER BY type'
)
]
flagstaff_passage = (
get_db()
.execute(
"""SELECT CAST(passage as integer) FROM passages
WHERE name = 'Flagstaff'"""
)
.fetchone()[0]
)
max_passage = (
get_db()
.execute("""SELECT MAX(CAST(passage as integer)) FROM passages""")
.fetchone()[0]
)
if __name__ == '__main__':
# Flask's development server automatically serves static files from /static.
app.run(host='127.0.0.1', port=8080, debug=True)