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#!/usr/bin/env python3
import argparse
import sys
import json
from collections.abc import Collection
import pywikiapi
import mwparserfromhell
import requests
import luadata
import tomli
OSMWIKI_ENDPOINT = 'https://wiki.openstreetmap.org/w/api.php'
OVERPASS_ENDPOINT = 'https://lz4.overpass-api.de/api/interpreter'
osmwiki = pywikiapi.Site(OSMWIKI_ENDPOINT)
parser = argparse.ArgumentParser()
parser.add_argument('--update', action='store_true')
args = parser.parse_args()
def find_template_calls(template_name):
for page in osmwiki.query_pages(
generator='embeddedin',
geititle='Template:' + template_name,
prop='revisions',
rvprop='content',
rvslots='main',
):
doc = mwparserfromhell.parse(page['revisions'][0]['slots']['main']['content'])
for template in doc.filter_templates():
if template.name.matches(template_name):
yield page, template
# step 1: find relation ids by looking for template calls
relation_ids = {}
for page, tpl in find_template_calls('list relations'):
if not tpl.has(1):
continue
for arg in tpl.get(1).split():
if arg.isdigit():
relation_ids[int(arg)] = relation_ids.get(arg, False) or tpl.has('length')
else:
# TODO: only if verbose output is enabled
print(
f'[warning] found unexpected argument "{arg}" in {page["title"]}',
file=sys.stderr,
)
# step 2: query overpass turbo about relations
sess = requests.session()
sess.headers['user-agent'] = 'osmwiki-overpass-bridge'
relations = {}
overpass_info = None
def get_length(route, relations):
"""
The length operator of Overpass QL does not support superrelations
(relations containing relations) and just returns 0 for those,
so we need to implement our own recursion.
"""
if route['members']:
# If there are any members of type relation we recurse,
# ensuring that we still report a sensible result when
# ways are mistakenly added directly to superrelations.
# TODO: gracefully handle KeyError exception
return sum(get_length(relations[m], relations) for m in route['members'])
else:
return float(route['tags']['length'])
def query_overpass(relation_ids: Collection[int], with_length: bool):
# TODO: split query if it gets too large
query = '[out:json]; ('
for rel_id in relation_ids:
query += f'relation({rel_id});'
if with_length:
query += 'rel(r);' # 1. recursion
query += 'rel(r);' # 2. recursion
query += 'rel(r);' # 3. recursion
query += ');'
if with_length:
query += 'convert result ::=::, ::id=id(), length=length(), member_ids=per_member(ref()), member_types=per_member(mtype());'
query += 'out body;'
res = sess.get(OVERPASS_ENDPOINT, params=dict(data=query))
res.raise_for_status()
KEYS = ('name', 'name:en', 'wikidata', 'wikipedia', 'website')
res = res.json()
all_relations = {rel['id']: rel for rel in res['elements']}
if with_length:
for rel in all_relations.values():
member_ids = [int(x) for x in rel['tags']['member_ids'].split(';')]
member_types = rel['tags']['member_types'].split(';')
rel['members'] = [
m_id
for m_id, m_type in zip(member_ids, member_types)
if m_type == 'relation'
]
for rel_id in relation_ids:
rel = all_relations[rel_id]
data = dict(tags={k: v for k, v in rel['tags'].items() if k in KEYS})
if with_length:
data['length'] = get_length(rel, all_relations)
relations[rel_id] = data
global overpass_info
overpass_info = res['osm3s']
query_overpass([rel_id for rel_id, length in relation_ids.items() if not length], False)
query_overpass([rel_id for rel_id, length in relation_ids.items() if length], True)
# step 3: serialize data as Lua
text = f'''\
-- This page is automatically generated by a Python script using the Overpass API.
-- {overpass_info['copyright']}
-- osm_base = {overpass_info['timestamp_osm_base']}
return ''' + luadata.serialize(
dict(relations=relations)
)
if args.update:
with open('credentials.toml', 'rb') as f:
creds = tomli.load(f)
osmwiki.login(creds['username'], creds['password'])
csrf_token = osmwiki('query', meta='tokens')['query']['tokens']['csrftoken']
osmwiki('edit', title='Module:Report/data', text=text, token=csrf_token)
else:
print(text)
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