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