mirror of
https://github.com/osm-search/Nominatim.git
synced 2024-11-30 12:22:10 +03:00
105 lines
3.4 KiB
Python
105 lines
3.4 KiB
Python
"""
|
|
Preprocessing of SQL files.
|
|
"""
|
|
import jinja2
|
|
|
|
|
|
def _get_partitions(conn):
|
|
""" Get the set of partitions currently in use.
|
|
"""
|
|
with conn.cursor() as cur:
|
|
cur.execute('SELECT DISTINCT partition FROM country_name')
|
|
partitions = set([0])
|
|
for row in cur:
|
|
partitions.add(row[0])
|
|
|
|
return partitions
|
|
|
|
|
|
def _get_tables(conn):
|
|
""" Return the set of tables currently in use.
|
|
Only includes non-partitioned
|
|
"""
|
|
with conn.cursor() as cur:
|
|
cur.execute("SELECT tablename FROM pg_tables WHERE schemaname = 'public'")
|
|
|
|
return set((row[0] for row in list(cur)))
|
|
|
|
|
|
def _setup_tablespace_sql(config):
|
|
""" Returns a dict with tablespace expressions for the different tablespace
|
|
kinds depending on whether a tablespace is configured or not.
|
|
"""
|
|
out = {}
|
|
for subset in ('ADDRESS', 'SEARCH', 'AUX'):
|
|
for kind in ('DATA', 'INDEX'):
|
|
tspace = getattr(config, 'TABLESPACE_{}_{}'.format(subset, kind))
|
|
if tspace:
|
|
tspace = 'TABLESPACE "{}"'.format(tspace)
|
|
out['{}_{}'.format(subset.lower, kind.lower())] = tspace
|
|
|
|
return out
|
|
|
|
|
|
def _setup_postgres_sql(conn):
|
|
""" Set up a dictionary with various Postgresql/Postgis SQL terms which
|
|
are dependent on the database version in use.
|
|
"""
|
|
out = {}
|
|
pg_version = conn.server_version_tuple()
|
|
# CREATE INDEX IF NOT EXISTS was introduced in PG9.5.
|
|
# Note that you need to ignore failures on older versions when
|
|
# using this construct.
|
|
out['if_index_not_exists'] = ' IF NOT EXISTS ' if pg_version >= (9, 5, 0) else ''
|
|
|
|
return out
|
|
|
|
|
|
def _setup_postgresql_features(conn):
|
|
""" Set up a dictionary with various optional Postgresql/Postgis features that
|
|
depend on the database version.
|
|
"""
|
|
pg_version = conn.server_version_tuple()
|
|
return {
|
|
'has_index_non_key_column' : pg_version >= (11, 0, 0)
|
|
}
|
|
|
|
class SQLPreprocessor:
|
|
""" A environment for preprocessing SQL files from the
|
|
lib-sql directory.
|
|
|
|
The preprocessor provides a number of default filters and variables.
|
|
The variables may be overwritten when rendering an SQL file.
|
|
|
|
The preprocessing is currently based on the jinja2 templating library
|
|
and follows its syntax.
|
|
"""
|
|
|
|
def __init__(self, conn, config):
|
|
self.env = jinja2.Environment(autoescape=False,
|
|
loader=jinja2.FileSystemLoader(str(config.lib_dir.sql)))
|
|
|
|
db_info = {}
|
|
db_info['partitions'] = _get_partitions(conn)
|
|
db_info['tables'] = _get_tables(conn)
|
|
db_info['reverse_only'] = 'search_name' not in db_info['tables']
|
|
db_info['tablespace'] = _setup_tablespace_sql(config)
|
|
|
|
self.env.globals['config'] = config
|
|
self.env.globals['db'] = db_info
|
|
self.env.globals['sql'] = _setup_postgres_sql(conn)
|
|
self.env.globals['postgres'] = _setup_postgresql_features(conn)
|
|
self.env.globals['modulepath'] = config.DATABASE_MODULE_PATH or \
|
|
str((config.project_dir / 'module').resolve())
|
|
|
|
|
|
def run_sql_file(self, conn, name, **kwargs):
|
|
""" Execute the given SQL file on the connection. The keyword arguments
|
|
may supply additional parameters for preprocessing.
|
|
"""
|
|
sql = self.env.get_template(name).render(**kwargs)
|
|
|
|
with conn.cursor() as cur:
|
|
cur.execute(sql)
|
|
conn.commit()
|