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# Copyright (C) 2016-present the asyncpg 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
from .types import ServerVersion
version_regex = re.compile(
r"(Postgre[^\s]*)?\s*"
r"(?P<major>[0-9]+)\.?"
r"((?P<minor>[0-9]+)\.?)?"
r"(?P<micro>[0-9]+)?"
r"(?P<releaselevel>[a-z]+)?"
r"(?P<serial>[0-9]+)?"
)
def split_server_version_string(version_string):
version_match = version_regex.search(version_string)
if version_match is None:
raise ValueError(
"Unable to parse Postgres "
f'version from "{version_string}"'
)
version = version_match.groupdict()
for ver_key, ver_value in version.items():
# Cast all possible versions parts to int
try:
version[ver_key] = int(ver_value)
except (TypeError, ValueError):
pass
if version.get("major") < 10:
return ServerVersion(
version.get("major"),
version.get("minor") or 0,
version.get("micro") or 0,
version.get("releaselevel") or "final",
version.get("serial") or 0,
)
# Since PostgreSQL 10 the versioning scheme has changed.
# 10.x really means 10.0.x. While parsing 10.1
# as (10, 1) may seem less confusing, in practice most
# version checks are written as version[:2], and we
# want to keep that behaviour consistent, i.e not fail
# a major version check due to a bugfix release.
return ServerVersion(
version.get("major"),
0,
version.get("minor") or 0,
version.get("releaselevel") or "final",
version.get("serial") or 0,
)
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