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Factorize rows_to_collection

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This commit is contained in:
Yohan Boniface 2016-05-17 10:05:39 +02:00
parent 8b5107e6c1
commit a9af21418b
1 changed files with 19 additions and 19 deletions
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38
backend.py
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@ -46,6 +46,8 @@ class BaseEvent:
'createdate': str(row['createdate']),
'last_updated': str(row['lastupdate'])
})
if "distance" in row:
properties['distance'] = row['distance']
return {
"type": "Feature",
"geometry": json.loads(row['geometry']),
@ -53,6 +55,12 @@ class BaseEvent:
"properties": properties
}
def rows_to_collection(self, rows):
return {
"type": "FeatureCollection",
"features": [self.row_to_feature(r) for r in rows]
}
class EventsResource(BaseEvent):
@ -60,10 +68,7 @@ class EventsResource(BaseEvent):
db = db_connect()
cur = db.cursor(cursor_factory=psycopg2.extras.DictCursor)
cur.execute("SELECT events_id, events_tags, createdate, lastupdate, st_asgeojson(geom) as geometry FROM events JOIN geo ON (hash=events_geo)")
resp.body = json.dumps({
"type": "FeatureCollection",
"features": [self.row_to_feature(r) for r in cur.fetchall()]
})
resp.body = json.dumps(self.rows_to_collection(cur.fetchall()))
resp.status = falcon.HTTP_200
@ -95,8 +100,8 @@ class EventResource(BaseEvent):
dist = 1
else:
dist = req.params['near'][2]
event_bbox = cur.mogrify(" AND ST_Intersects(geom, ST_Buffer(st_setsrid(st_makepoint(%s,%s),4326)::geography,%s)::geometry) ",(req.params['near'][0], req.params['near'][1], dist)).decode("utf-8")
event_dist = cur.mogrify(", 'distance', ST_Length(ST_ShortestLine(geom, st_setsrid(st_makepoint(%s,%s),4326))::geography) ",(req.params['near'][0], req.params['near'][1])).decode("utf-8")
event_bbox = cur.mogrify(" AND ST_Intersects(geom, ST_Buffer(st_setsrid(st_makepoint(%s,%s),4326)::geography,%s)::geometry) ", (req.params['near'][0], req.params['near'][1], dist)).decode("utf-8")
event_dist = cur.mogrify("ST_Length(ST_ShortestLine(geom, st_setsrid(st_makepoint(%s,%s),4326))::geography) as distance,", (req.params['near'][0], req.params['near'][1])).decode("utf-8")
else:
event_bbox = ""
event_dist = ""
@ -114,7 +119,7 @@ class EventResource(BaseEvent):
# limit search with fixed time (now to stop)
event_when = cur.mogrify("tstzrange(now(),%s,'[]')", (req.params['stop'],)).decode("utf-8")
else:
event_when = """tstzrange(now(),now(),'[]')"""
event_when = "tstzrange(now(),now(),'[]')"
if 'what' in req.params:
# limit search based on "what"
@ -134,18 +139,13 @@ class EventResource(BaseEvent):
event_geom = "geom"
# Search recent active events.
cur.execute("""
SELECT '{"type":"Feature", "properties": '|| (events_tags::jsonb || jsonb_build_object('id',events_id,'createdate',createdate,'lastupdate',lastupdate """+event_dist+"""))::text ||', "geometry":'|| st_asgeojson("""+event_geom+""") ||' }' as feature
FROM events
JOIN geo ON (hash=events_geo) """ + event_bbox +"""
WHERE events_when && """+ event_when + event_what + event_type +"""
ORDER BY createdate DESC
LIMIT 200;
""")
resp.body = """{"type":"FeatureCollection", "features": [
"""+""",
""".join([x[0] for x in cur.fetchall()])+"""
]}"""
sql = """SELECT events_id, events_tags, createdate, lastupdate, {event_dist} st_asgeojson({event_geom}) as geometry FROM events JOIN geo ON (hash=events_geo) {event_bbox} WHERE events_when && {event_when} {event_what} {event_type} ORDER BY createdate DESC LIMIT 200"""
# No user generated content here, so format is safe.
sql = sql.format(event_dist=event_dist, event_geom=event_geom,
event_bbox=event_bbox, event_what=event_what,
event_when=event_when, event_type=event_type)
cur.execute(sql)
resp.body = json.dumps(self.rows_to_collection(cur.fetchall()))
resp.status = falcon.HTTP_200
else:
# Get single event geojson Feature by id.