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# Copyright (C) 2016-present the ayncpg authors and contributors
# <see AUTHORS file>
#
# This module is part of asyncpg and is released under
# the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0
import re
def _quote_ident(ident):
return '"{}"'.format(ident.replace('"', '""'))
def _quote_literal(string):
return "'{}'".format(string.replace("'", "''"))
async def _mogrify(conn, query, args):
"""Safely inline arguments to query text."""
# Introspect the target query for argument types and
# build a list of safely-quoted fully-qualified type names.
ps = await conn.prepare(query)
paramtypes = []
for t in ps.get_parameters():
if t.name.endswith('[]'):
pname = '_' + t.name[:-2]
else:
pname = t.name
paramtypes.append('{}.{}'.format(
_quote_ident(t.schema), _quote_ident(pname)))
del ps
# Use Postgres to convert arguments to text representation
# by casting each value to text.
cols = ['quote_literal(${}::{}::text)'.format(i, t)
for i, t in enumerate(paramtypes, start=1)]
textified = await conn.fetchrow(
'SELECT {cols}'.format(cols=', '.join(cols)), *args)
# Finally, replace $n references with text values.
return re.sub(
r'\$(\d+)\b', lambda m: textified[int(m.group(1)) - 1], query)
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