2 Functions to facilitate accessing and comparing the content of DB tables.
7 from steps.check_functions import Almost
9 ID_REGEX = re.compile(r"(?P<typ>[NRW])(?P<oid>\d+)(:(?P<cls>\w+))?")
12 """ Splits a unique identifier for places into its components.
13 As place_ids cannot be used for testing, we use a unique
14 identifier instead that is of the form <osmtype><osmid>[:<class>].
17 def __init__(self, oid):
18 self.typ = self.oid = self.cls = None
21 m = ID_REGEX.fullmatch(oid)
22 assert m is not None, \
23 "ID '{}' not of form <osmtype><osmid>[:<class>]".format(oid)
25 self.typ = m.group('typ')
26 self.oid = m.group('oid')
27 self.cls = m.group('cls')
31 return self.typ + self.oid
33 return '{self.typ}{self.oid}:{self.cls}'.format(self=self)
35 def query_osm_id(self, cur, query):
36 """ Run a query on cursor `cur` using osm ID, type and class. The
37 `query` string must contain exactly one placeholder '{}' where
38 the 'where' query should go.
40 where = 'osm_type = %s and osm_id = %s'
41 params = [self.typ, self. oid]
43 if self.cls is not None:
44 where += ' and class = %s'
45 params.append(self.cls)
47 cur.execute(query.format(where), params)
49 def row_by_place_id(self, cur, table, extra_columns=None):
50 """ Get a row by place_id from the given table using cursor `cur`.
51 extra_columns may contain a list additional elements for the select
54 pid = self.get_place_id(cur)
55 query = "SELECT {} FROM {} WHERE place_id = %s".format(
56 ','.join(['*'] + (extra_columns or [])), table)
57 cur.execute(query, (pid, ))
59 def get_place_id(self, cur):
60 """ Look up the place id for the ID. Throws an assertion if the ID
63 self.query_osm_id(cur, "SELECT place_id FROM placex WHERE {}")
64 assert cur.rowcount == 1, \
65 "Place ID {!s} not unique. Found {} entries.".format(self, cur.rowcount)
67 return cur.fetchone()[0]
71 """ Represents a row from a database and offers comparison functions.
73 def __init__(self, nid, db_row, context):
76 self.context = context
78 def assert_row(self, row, exclude_columns):
79 """ Check that all columns of the given behave row are contained
80 in the database row. Exclude behave rows with the names given
81 in the `exclude_columns` list.
83 for name, value in zip(row.headings, row.cells):
84 if name not in exclude_columns:
85 assert self.contains(name, value), self.assert_msg(name, value)
87 def contains(self, name, expected):
88 """ Check that the DB row contains a column `name` with the given value.
91 column, field = name.split('+', 1)
92 return self._contains_hstore_value(column, field, expected)
94 if name == 'geometry':
95 return self._has_geometry(expected)
97 if name not in self.db_row:
100 actual = self.db_row[name]
103 return actual is None
105 if name == 'name' and ':' not in expected:
106 return self._compare_column(actual[name], expected)
108 if 'place_id' in name:
109 return self._compare_place_id(actual, expected)
111 if name == 'centroid':
112 return self._has_centroid(expected)
114 return self._compare_column(actual, expected)
116 def _contains_hstore_value(self, column, field, expected):
120 if column not in self.db_row:
124 return self.db_row[column] is None or field not in self.db_row[column]
126 if self.db_row[column] is None:
129 return self._compare_column(self.db_row[column].get(field), expected)
131 def _compare_column(self, actual, expected):
132 if isinstance(actual, dict):
133 return actual == eval('{' + expected + '}')
135 return str(actual) == expected
137 def _compare_place_id(self, actual, expected):
141 with self.context.db.cursor() as cur:
142 return NominatimID(expected).get_place_id(cur) == actual
144 def _has_centroid(self, expected):
145 if expected == 'in geometry':
146 with self.context.db.cursor() as cur:
147 cur.execute("""SELECT ST_Within(ST_SetSRID(ST_Point({cx}, {cy}), 4326),
148 ST_SetSRID('{geomtxt}'::geometry, 4326))""".format(**self.db_row))
149 return cur.fetchone()[0]
151 x, y = expected.split(' ')
152 return Almost(float(x)) == self.db_row['cx'] and Almost(float(y)) == self.db_row['cy']
154 def _has_geometry(self, expected):
155 geom = self.context.osm.parse_geometry(expected, self.context.scene)
156 with self.context.db.cursor() as cur:
157 cur.execute("""SELECT ST_Equals(ST_SnapToGrid({}, 0.00001, 0.00001),
158 ST_SnapToGrid(ST_SetSRID('{}'::geometry, 4326), 0.00001, 0.00001))""".format(
159 geom, self.db_row['geomtxt']))
160 return cur.fetchone()[0]
162 def assert_msg(self, name, value):
163 """ Return a string with an informative message for a failed compare.
165 msg = "\nBad column '{}' in row '{!s}'.".format(name, self.nid)
166 actual = self._get_actual(name)
167 if actual is not None:
168 msg += " Expected: {}, got: {}.".format(value, actual)
170 msg += " No such column."
172 return msg + "\nFull DB row: {}".format(json.dumps(dict(self.db_row), indent=4, default=str))
174 def _get_actual(self, name):
176 column, field = name.split('+', 1)
179 return (self.db_row.get(column) or {}).get(field)
181 if name == 'geometry':
182 return self.db_row['geomtxt']
184 if name not in self.db_row:
187 if name == 'centroid':
188 return "POINT({cx} {cy})".format(**self.db_row)
190 actual = self.db_row[name]
192 if 'place_id' in name:
199 with self.context.db.cursor():
200 cur.execute("""SELECT osm_type, osm_id, class
201 FROM placex WHERE place_id = %s""",
204 if cur.rowcount == 1:
205 return "{0[0]}{0[1]}:{0[2]}".format(cur.fetchone())
207 return "[place ID {} not found]".format(actual)