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import importlib.machinery
import os
import shutil
import textwrap
from sqlalchemy.testing import config
from sqlalchemy.testing import provision
from . import util as testing_util
from .. import command
from .. import script
from .. import util
from ..script import Script
from ..script import ScriptDirectory
def _get_staging_directory():
if provision.FOLLOWER_IDENT:
return "scratch_%s" % provision.FOLLOWER_IDENT
else:
return "scratch"
def staging_env(create=True, template="generic", sourceless=False):
cfg = _testing_config()
if create:
path = os.path.join(_get_staging_directory(), "scripts")
assert not os.path.exists(path), (
"staging directory %s already exists; poor cleanup?" % path
)
command.init(cfg, path, template=template)
if sourceless:
try:
# do an import so that a .pyc/.pyo is generated.
util.load_python_file(path, "env.py")
except AttributeError:
# we don't have the migration context set up yet
# so running the .env py throws this exception.
# theoretically we could be using py_compiler here to
# generate .pyc/.pyo without importing but not really
# worth it.
pass
assert sourceless in (
"pep3147_envonly",
"simple",
"pep3147_everything",
), sourceless
make_sourceless(
os.path.join(path, "env.py"),
"pep3147" if "pep3147" in sourceless else "simple",
)
sc = script.ScriptDirectory.from_config(cfg)
return sc
def clear_staging_env():
from sqlalchemy.testing import engines
engines.testing_reaper.close_all()
shutil.rmtree(_get_staging_directory(), True)
def script_file_fixture(txt):
dir_ = os.path.join(_get_staging_directory(), "scripts")
path = os.path.join(dir_, "script.py.mako")
with open(path, "w") as f:
f.write(txt)
def env_file_fixture(txt):
dir_ = os.path.join(_get_staging_directory(), "scripts")
txt = (
"""
from alembic import context
config = context.config
"""
+ txt
)
path = os.path.join(dir_, "env.py")
pyc_path = util.pyc_file_from_path(path)
if pyc_path:
os.unlink(pyc_path)
with open(path, "w") as f:
f.write(txt)
def _sqlite_file_db(tempname="foo.db", future=False, scope=None, **options):
dir_ = os.path.join(_get_staging_directory(), "scripts")
url = "sqlite:///%s/%s" % (dir_, tempname)
if scope and util.sqla_14:
options["scope"] = scope
return testing_util.testing_engine(url=url, future=future, options=options)
def _sqlite_testing_config(sourceless=False, future=False):
dir_ = os.path.join(_get_staging_directory(), "scripts")
url = "sqlite:///%s/foo.db" % dir_
sqlalchemy_future = future or ("future" in config.db.__class__.__module__)
return _write_config_file(
"""
[alembic]
script_location = %s
sqlalchemy.url = %s
sourceless = %s
%s
[loggers]
keys = root,sqlalchemy
[handlers]
keys = console
[logger_root]
level = WARN
handlers = console
qualname =
[logger_sqlalchemy]
level = DEBUG
handlers =
qualname = sqlalchemy.engine
[handler_console]
class = StreamHandler
args = (sys.stderr,)
level = NOTSET
formatter = generic
[formatters]
keys = generic
[formatter_generic]
format = %%(levelname)-5.5s [%%(name)s] %%(message)s
datefmt = %%H:%%M:%%S
"""
% (
dir_,
url,
"true" if sourceless else "false",
"sqlalchemy.future = true" if sqlalchemy_future else "",
)
)
def _multi_dir_testing_config(sourceless=False, extra_version_location=""):
dir_ = os.path.join(_get_staging_directory(), "scripts")
sqlalchemy_future = "future" in config.db.__class__.__module__
url = "sqlite:///%s/foo.db" % dir_
return _write_config_file(
"""
[alembic]
script_location = %s
sqlalchemy.url = %s
sqlalchemy.future = %s
sourceless = %s
version_locations = %%(here)s/model1/ %%(here)s/model2/ %%(here)s/model3/ %s
[loggers]
keys = root
[handlers]
keys = console
[logger_root]
level = WARN
handlers = console
qualname =
[handler_console]
class = StreamHandler
args = (sys.stderr,)
level = NOTSET
formatter = generic
[formatters]
keys = generic
[formatter_generic]
format = %%(levelname)-5.5s [%%(name)s] %%(message)s
datefmt = %%H:%%M:%%S
"""
% (
dir_,
url,
"true" if sqlalchemy_future else "false",
"true" if sourceless else "false",
extra_version_location,
)
)
def _no_sql_testing_config(dialect="postgresql", directives=""):
"""use a postgresql url with no host so that
connections guaranteed to fail"""
dir_ = os.path.join(_get_staging_directory(), "scripts")
return _write_config_file(
"""
[alembic]
script_location = %s
sqlalchemy.url = %s://
%s
[loggers]
keys = root
[handlers]
keys = console
[logger_root]
level = WARN
handlers = console
qualname =
[handler_console]
class = StreamHandler
args = (sys.stderr,)
level = NOTSET
formatter = generic
[formatters]
keys = generic
[formatter_generic]
format = %%(levelname)-5.5s [%%(name)s] %%(message)s
datefmt = %%H:%%M:%%S
"""
% (dir_, dialect, directives)
)
def _write_config_file(text):
cfg = _testing_config()
with open(cfg.config_file_name, "w") as f:
f.write(text)
return cfg
def _testing_config():
from alembic.config import Config
if not os.access(_get_staging_directory(), os.F_OK):
os.mkdir(_get_staging_directory())
return Config(os.path.join(_get_staging_directory(), "test_alembic.ini"))
def write_script(
scriptdir, rev_id, content, encoding="ascii", sourceless=False
):
old = scriptdir.revision_map.get_revision(rev_id)
path = old.path
content = textwrap.dedent(content)
if encoding:
content = content.encode(encoding)
with open(path, "wb") as fp:
fp.write(content)
pyc_path = util.pyc_file_from_path(path)
if pyc_path:
os.unlink(pyc_path)
script = Script._from_path(scriptdir, path)
old = scriptdir.revision_map.get_revision(script.revision)
if old.down_revision != script.down_revision:
raise Exception(
"Can't change down_revision " "on a refresh operation."
)
scriptdir.revision_map.add_revision(script, _replace=True)
if sourceless:
make_sourceless(
path, "pep3147" if sourceless == "pep3147_everything" else "simple"
)
def make_sourceless(path, style):
import py_compile
py_compile.compile(path)
if style == "simple":
pyc_path = util.pyc_file_from_path(path)
suffix = importlib.machinery.BYTECODE_SUFFIXES[0]
filepath, ext = os.path.splitext(path)
simple_pyc_path = filepath + suffix
shutil.move(pyc_path, simple_pyc_path)
pyc_path = simple_pyc_path
else:
assert style in ("pep3147", "simple")
pyc_path = util.pyc_file_from_path(path)
assert os.access(pyc_path, os.F_OK)
os.unlink(path)
def three_rev_fixture(cfg):
a = util.rev_id()
b = util.rev_id()
c = util.rev_id()
script = ScriptDirectory.from_config(cfg)
script.generate_revision(a, "revision a", refresh=True, head="base")
write_script(
script,
a,
"""\
"Rev A"
revision = '%s'
down_revision = None
from alembic import op
def upgrade():
op.execute("CREATE STEP 1")
def downgrade():
op.execute("DROP STEP 1")
"""
% a,
)
script.generate_revision(b, "revision b", refresh=True, head=a)
write_script(
script,
b,
f"""# coding: utf-8
"Rev B, méil, %3"
revision = '{b}'
down_revision = '{a}'
from alembic import op
def upgrade():
op.execute("CREATE STEP 2")
def downgrade():
op.execute("DROP STEP 2")
""",
encoding="utf-8",
)
script.generate_revision(c, "revision c", refresh=True, head=b)
write_script(
script,
c,
"""\
"Rev C"
revision = '%s'
down_revision = '%s'
from alembic import op
def upgrade():
op.execute("CREATE STEP 3")
def downgrade():
op.execute("DROP STEP 3")
"""
% (c, b),
)
return a, b, c
def multi_heads_fixture(cfg, a, b, c):
"""Create a multiple head fixture from the three-revs fixture"""
# a->b->c
# -> d -> e
# -> f
d = util.rev_id()
e = util.rev_id()
f = util.rev_id()
script = ScriptDirectory.from_config(cfg)
script.generate_revision(
d, "revision d from b", head=b, splice=True, refresh=True
)
write_script(
script,
d,
"""\
"Rev D"
revision = '%s'
down_revision = '%s'
from alembic import op
def upgrade():
op.execute("CREATE STEP 4")
def downgrade():
op.execute("DROP STEP 4")
"""
% (d, b),
)
script.generate_revision(
e, "revision e from d", head=d, splice=True, refresh=True
)
write_script(
script,
e,
"""\
"Rev E"
revision = '%s'
down_revision = '%s'
from alembic import op
def upgrade():
op.execute("CREATE STEP 5")
def downgrade():
op.execute("DROP STEP 5")
"""
% (e, d),
)
script.generate_revision(
f, "revision f from b", head=b, splice=True, refresh=True
)
write_script(
script,
f,
"""\
"Rev F"
revision = '%s'
down_revision = '%s'
from alembic import op
def upgrade():
op.execute("CREATE STEP 6")
def downgrade():
op.execute("DROP STEP 6")
"""
% (f, b),
)
return d, e, f
def _multidb_testing_config(engines):
"""alembic.ini fixture to work exactly with the 'multidb' template"""
dir_ = os.path.join(_get_staging_directory(), "scripts")
sqlalchemy_future = "future" in config.db.__class__.__module__
databases = ", ".join(engines.keys())
engines = "\n\n".join(
"[%s]\n" "sqlalchemy.url = %s" % (key, value.url)
for key, value in engines.items()
)
return _write_config_file(
"""
[alembic]
script_location = %s
sourceless = false
sqlalchemy.future = %s
databases = %s
%s
[loggers]
keys = root
[handlers]
keys = console
[logger_root]
level = WARN
handlers = console
qualname =
[handler_console]
class = StreamHandler
args = (sys.stderr,)
level = NOTSET
formatter = generic
[formatters]
keys = generic
[formatter_generic]
format = %%(levelname)-5.5s [%%(name)s] %%(message)s
datefmt = %%H:%%M:%%S
"""
% (dir_, "true" if sqlalchemy_future else "false", databases, engines)
)
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