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fixtures.py

from __future__ import annotations

import configparser
from contextlib import contextmanager
import io
import re
from typing import Any
from typing import Dict

from sqlalchemy import Column
from sqlalchemy import inspect
from sqlalchemy import MetaData
from sqlalchemy import String
from sqlalchemy import Table
from sqlalchemy import testing
from sqlalchemy import text
from sqlalchemy.testing import config
from sqlalchemy.testing import mock
from sqlalchemy.testing.assertions import eq_
from sqlalchemy.testing.fixtures import TablesTest as SQLAlchemyTablesTest
from sqlalchemy.testing.fixtures import TestBase as SQLAlchemyTestBase

import alembic
from .assertions import _get_dialect
from ..environment import EnvironmentContext
from ..migration import MigrationContext
from ..operations import Operations
from ..util import sqla_compat
from ..util.sqla_compat import create_mock_engine
from ..util.sqla_compat import sqla_14
from ..util.sqla_compat import sqla_2

testing_config = configparser.ConfigParser()
testing_config.read(["test.cfg"])

class TestBase(SQLAlchemyTestBase):
    is_sqlalchemy_future = sqla_2

@testing.fixture()
    def ops_context(self, migration_context):
        with migration_context.begin_transaction(_per_migration=True):
            yield Operations(migration_context)

@testing.fixture
    def migration_context(self, connection):
        return MigrationContext.configure(
            connection, opts=dict(transaction_per_migration=True)
        )

@testing.fixture
    def connection(self):
        with config.db.connect() as conn:
            yield conn

class TablesTest(TestBase, SQLAlchemyTablesTest):
    pass

if sqla_14:
    from sqlalchemy.testing.fixtures import FutureEngineMixin
else:

class FutureEngineMixin:  # type:ignore[no-redef]
        __requires__ = ("sqlalchemy_14",)

FutureEngineMixin.is_sqlalchemy_future = True

def capture_db(dialect="postgresql://"):
    buf = []

def dump(sql, *multiparams, **params):
        buf.append(str(sql.compile(dialect=engine.dialect)))

engine = create_mock_engine(dialect, dump)
    return engine, buf

_engs: Dict[Any, Any] = {}

@contextmanager
def capture_context_buffer(**kw):
    if kw.pop("bytes_io", False):
        buf = io.BytesIO()
    else:
        buf = io.StringIO()

kw.update({"dialect_name": "sqlite", "output_buffer": buf})
    conf = EnvironmentContext.configure

def configure(*arg, **opt):
        opt.update(**kw)
        return conf(*arg, **opt)

with mock.patch.object(EnvironmentContext, "configure", configure):
        yield buf

@contextmanager
def capture_engine_context_buffer(**kw):
    from .env import _sqlite_file_db
    from sqlalchemy import event

buf = io.StringIO()

eng = _sqlite_file_db()

conn = eng.connect()

@event.listens_for(conn, "before_cursor_execute")
    def bce(conn, cursor, statement, parameters, context, executemany):
        buf.write(statement + "\n")

kw.update({"connection": conn})
    conf = EnvironmentContext.configure

def configure(*arg, **opt):
        opt.update(**kw)
        return conf(*arg, **opt)

with mock.patch.object(EnvironmentContext, "configure", configure):
        yield buf

def op_fixture(
    dialect="default",
    as_sql=False,
    naming_convention=None,
    literal_binds=False,
    native_boolean=None,
):

opts = {}
    if naming_convention:
        opts["target_metadata"] = MetaData(naming_convention=naming_convention)

class buffer_:
        def __init__(self):
            self.lines = []

def write(self, msg):
            msg = msg.strip()
            msg = re.sub(r"[\n\t]", "", msg)
            if as_sql:
                # the impl produces soft tabs,
                # so search for blocks of 4 spaces
                msg = re.sub(r"    ", "", msg)
                msg = re.sub(r"\;\n*$", "", msg)

self.lines.append(msg)

def flush(self):
            pass

buf = buffer_()

class ctx(MigrationContext):
        def get_buf(self):
            return buf

def clear_assertions(self):
            buf.lines[:] = []

def assert_(self, *sql):
            # TODO: make this more flexible about
            # whitespace and such
            eq_(buf.lines, [re.sub(r"[\n\t]", "", s) for s in sql])

def assert_contains(self, sql):
            for stmt in buf.lines:
                if re.sub(r"[\n\t]", "", sql) in stmt:
                    return
            else:
                assert False, "Could not locate fragment %r in %r" % (
                    sql,
                    buf.lines,
                )

if as_sql:
        opts["as_sql"] = as_sql
    if literal_binds:
        opts["literal_binds"] = literal_binds
    if not sqla_14 and dialect == "mariadb":
        ctx_dialect = _get_dialect("mysql")
        ctx_dialect.server_version_info = (10, 4, 0, "MariaDB")

else:
        ctx_dialect = _get_dialect(dialect)
    if native_boolean is not None:
        ctx_dialect.supports_native_boolean = native_boolean
        # this is new as of SQLAlchemy 1.2.7 and is used by SQL Server,
        # which breaks assumptions in the alembic test suite
        ctx_dialect.non_native_boolean_check_constraint = True
    if not as_sql:

def execute(stmt, *multiparam, **param):
            if isinstance(stmt, str):
                stmt = text(stmt)
            assert stmt.supports_execution
            sql = str(stmt.compile(dialect=ctx_dialect))

buf.write(sql)

connection = mock.Mock(dialect=ctx_dialect, execute=execute)
    else:
        opts["output_buffer"] = buf
        connection = None
    context = ctx(ctx_dialect, connection, opts)

alembic.op._proxy = Operations(context)
    return context

class AlterColRoundTripFixture:

# since these tests are about syntax, use more recent SQLAlchemy as some of
    # the type / server default compare logic might not work on older
    # SQLAlchemy versions as seems to be the case for SQLAlchemy 1.1 on Oracle

__requires__ = ("alter_column",)

def setUp(self):
        self.conn = config.db.connect()
        self.ctx = MigrationContext.configure(self.conn)
        self.op = Operations(self.ctx)
        self.metadata = MetaData()

def _compare_type(self, t1, t2):
        c1 = Column("q", t1)
        c2 = Column("q", t2)
        assert not self.ctx.impl.compare_type(
            c1, c2
        ), "Type objects %r and %r didn't compare as equivalent" % (t1, t2)

def _compare_server_default(self, t1, s1, t2, s2):
        c1 = Column("q", t1, server_default=s1)
        c2 = Column("q", t2, server_default=s2)
        assert not self.ctx.impl.compare_server_default(
            c1, c2, s2, s1
        ), "server defaults %r and %r didn't compare as equivalent" % (s1, s2)

def tearDown(self):
        sqla_compat._safe_rollback_connection_transaction(self.conn)
        with self.conn.begin():
            self.metadata.drop_all(self.conn)
        self.conn.close()

def _run_alter_col(self, from_, to_, compare=None):
        column = Column(
            from_.get("name", "colname"),
            from_.get("type", String(10)),
            nullable=from_.get("nullable", True),
            server_default=from_.get("server_default", None),
            # comment=from_.get("comment", None)
        )
        t = Table("x", self.metadata, column)

with sqla_compat._ensure_scope_for_ddl(self.conn):
            t.create(self.conn)
            insp = inspect(self.conn)
            old_col = insp.get_columns("x")[0]

# TODO: conditional comment support
            self.op.alter_column(
                "x",
                column.name,
                existing_type=column.type,
                existing_server_default=column.server_default
                if column.server_default is not None
                else False,
                existing_nullable=True if column.nullable else False,
                # existing_comment=column.comment,
                nullable=to_.get("nullable", None),
                # modify_comment=False,
                server_default=to_.get("server_default", False),
                new_column_name=to_.get("name", None),
                type_=to_.get("type", None),
            )

insp = inspect(self.conn)
        new_col = insp.get_columns("x")[0]

if compare is None:
            compare = to_

eq_(
            new_col["name"],
            compare["name"] if "name" in compare else column.name,
        )
        self._compare_type(
            new_col["type"], compare.get("type", old_col["type"])
        )
        eq_(new_col["nullable"], compare.get("nullable", column.nullable))
        self._compare_server_default(
            new_col["type"],
            new_col.get("default", None),
            compare.get("type", old_col["type"]),
            compare["server_default"].text
            if "server_default" in compare
            else column.server_default.arg.text
            if column.server_default is not None
            else None,
        )

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..	dir	-	root/root	0755	2025-05-15 07:01:34
__pycache__	dir	-	root/root	0755	2025-05-15 07:01:34
plugin	dir	-	root/root	0755	2025-05-15 07:01:34
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__init__.py	text/x-python	1.13 KB	root/root	0644	2025-04-17 01:10:59
assertions.py	text/x-python	4.9 KB	root/root	0644	2025-04-17 01:10:59
env.py	text/x-python	10.5 KB	root/root	0644	2025-04-17 01:10:59
fixtures.py	text/x-python	8.9 KB	root/root	0644	2025-04-17 01:10:59
requirements.py	text/x-python	4.82 KB	root/root	0644	2025-04-17 01:10:59
schemacompare.py	text/x-python	4.43 KB	root/root	0644	2025-04-17 01:10:59
util.py	text/x-python	3.27 KB	root/root	0644	2025-04-17 01:10:59
warnings.py	text/x-python	1.05 KB	root/root	0644	2025-04-17 01:10:59