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265 lines
7.7 KiB
Python
265 lines
7.7 KiB
Python
# coding: utf-8
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from contextlib import contextmanager
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import io
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import re
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from sqlalchemy import Column
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from sqlalchemy import inspect
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from sqlalchemy import MetaData
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from sqlalchemy import String
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from sqlalchemy import Table
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from sqlalchemy import text
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from sqlalchemy.testing import config
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from sqlalchemy.testing import mock
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from sqlalchemy.testing.assertions import eq_
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from sqlalchemy.testing.fixtures import TestBase # noqa
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import alembic
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from .assertions import _get_dialect
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from ..environment import EnvironmentContext
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from ..migration import MigrationContext
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from ..operations import Operations
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from ..util import compat
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from ..util.compat import configparser
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from ..util.compat import string_types
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from ..util.compat import text_type
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from ..util.sqla_compat import create_mock_engine
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testing_config = configparser.ConfigParser()
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testing_config.read(["test.cfg"])
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def capture_db(dialect="postgresql://"):
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buf = []
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def dump(sql, *multiparams, **params):
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buf.append(str(sql.compile(dialect=engine.dialect)))
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engine = create_mock_engine(dialect, dump)
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return engine, buf
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_engs = {}
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@contextmanager
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def capture_context_buffer(**kw):
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if kw.pop("bytes_io", False):
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buf = io.BytesIO()
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else:
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buf = io.StringIO()
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kw.update({"dialect_name": "sqlite", "output_buffer": buf})
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conf = EnvironmentContext.configure
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def configure(*arg, **opt):
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opt.update(**kw)
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return conf(*arg, **opt)
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with mock.patch.object(EnvironmentContext, "configure", configure):
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yield buf
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@contextmanager
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def capture_engine_context_buffer(**kw):
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from .env import _sqlite_file_db
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from sqlalchemy import event
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buf = compat.StringIO()
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eng = _sqlite_file_db()
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conn = eng.connect()
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@event.listens_for(conn, "before_cursor_execute")
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def bce(conn, cursor, statement, parameters, context, executemany):
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buf.write(statement + "\n")
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kw.update({"connection": conn})
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conf = EnvironmentContext.configure
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def configure(*arg, **opt):
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opt.update(**kw)
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return conf(*arg, **opt)
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with mock.patch.object(EnvironmentContext, "configure", configure):
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yield buf
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def op_fixture(
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dialect="default",
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as_sql=False,
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naming_convention=None,
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literal_binds=False,
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native_boolean=None,
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):
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opts = {}
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if naming_convention:
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opts["target_metadata"] = MetaData(naming_convention=naming_convention)
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class buffer_(object):
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def __init__(self):
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self.lines = []
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def write(self, msg):
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msg = msg.strip()
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msg = re.sub(r"[\n\t]", "", msg)
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if as_sql:
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# the impl produces soft tabs,
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# so search for blocks of 4 spaces
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msg = re.sub(r" ", "", msg)
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msg = re.sub(r"\;\n*$", "", msg)
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self.lines.append(msg)
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def flush(self):
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pass
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buf = buffer_()
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class ctx(MigrationContext):
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def get_buf(self):
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return buf
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def clear_assertions(self):
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buf.lines[:] = []
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def assert_(self, *sql):
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# TODO: make this more flexible about
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# whitespace and such
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eq_(buf.lines, [re.sub(r"[\n\t]", "", s) for s in sql])
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def assert_contains(self, sql):
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for stmt in buf.lines:
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if re.sub(r"[\n\t]", "", sql) in stmt:
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return
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else:
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assert False, "Could not locate fragment %r in %r" % (
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sql,
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buf.lines,
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)
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if as_sql:
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opts["as_sql"] = as_sql
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if literal_binds:
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opts["literal_binds"] = literal_binds
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if dialect == "mariadb":
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ctx_dialect = _get_dialect("mysql")
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ctx_dialect.server_version_info = (10, 0, 0, "MariaDB")
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else:
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ctx_dialect = _get_dialect(dialect)
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if native_boolean is not None:
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ctx_dialect.supports_native_boolean = native_boolean
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# this is new as of SQLAlchemy 1.2.7 and is used by SQL Server,
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# which breaks assumptions in the alembic test suite
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ctx_dialect.non_native_boolean_check_constraint = True
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if not as_sql:
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def execute(stmt, *multiparam, **param):
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if isinstance(stmt, string_types):
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stmt = text(stmt)
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assert stmt.supports_execution
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sql = text_type(stmt.compile(dialect=ctx_dialect))
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buf.write(sql)
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connection = mock.Mock(dialect=ctx_dialect, execute=execute)
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else:
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opts["output_buffer"] = buf
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connection = None
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context = ctx(ctx_dialect, connection, opts)
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alembic.op._proxy = Operations(context)
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return context
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class AlterColRoundTripFixture(object):
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# since these tests are about syntax, use more recent SQLAlchemy as some of
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# the type / server default compare logic might not work on older
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# SQLAlchemy versions as seems to be the case for SQLAlchemy 1.1 on Oracle
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__requires__ = ("alter_column", "sqlalchemy_12")
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def setUp(self):
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self.conn = config.db.connect()
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self.ctx = MigrationContext.configure(self.conn)
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self.op = Operations(self.ctx)
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self.metadata = MetaData()
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def _compare_type(self, t1, t2):
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c1 = Column("q", t1)
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c2 = Column("q", t2)
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assert not self.ctx.impl.compare_type(
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c1, c2
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), "Type objects %r and %r didn't compare as equivalent" % (t1, t2)
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def _compare_server_default(self, t1, s1, t2, s2):
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c1 = Column("q", t1, server_default=s1)
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c2 = Column("q", t2, server_default=s2)
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assert not self.ctx.impl.compare_server_default(
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c1, c2, s2, s1
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), "server defaults %r and %r didn't compare as equivalent" % (s1, s2)
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def tearDown(self):
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self.metadata.drop_all(self.conn)
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self.conn.close()
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def _run_alter_col(self, from_, to_, compare=None):
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column = Column(
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from_.get("name", "colname"),
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from_.get("type", String(10)),
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nullable=from_.get("nullable", True),
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server_default=from_.get("server_default", None),
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# comment=from_.get("comment", None)
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)
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t = Table("x", self.metadata, column)
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t.create(self.conn)
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insp = inspect(self.conn)
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old_col = insp.get_columns("x")[0]
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# TODO: conditional comment support
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self.op.alter_column(
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"x",
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column.name,
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existing_type=column.type,
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existing_server_default=column.server_default
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if column.server_default is not None
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else False,
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existing_nullable=True if column.nullable else False,
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# existing_comment=column.comment,
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nullable=to_.get("nullable", None),
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# modify_comment=False,
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server_default=to_.get("server_default", False),
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new_column_name=to_.get("name", None),
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type_=to_.get("type", None),
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)
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insp = inspect(self.conn)
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new_col = insp.get_columns("x")[0]
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if compare is None:
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compare = to_
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eq_(
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new_col["name"],
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compare["name"] if "name" in compare else column.name,
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)
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self._compare_type(
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new_col["type"], compare.get("type", old_col["type"])
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)
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eq_(new_col["nullable"], compare.get("nullable", column.nullable))
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self._compare_server_default(
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new_col["type"],
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new_col.get("default", None),
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compare.get("type", old_col["type"]),
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compare["server_default"].text
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if "server_default" in compare
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else column.server_default.arg.text
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if column.server_default is not None
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else None,
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)
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