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Mini Shell
#!coding: utf-8
import os
import shutil
import textwrap
from ..util.compat import u
from ..script import Script, ScriptDirectory
from .. import util
from . import engines
from . import provision
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):
from alembic import command, script
cfg = _testing_config()
if create:
path = os.path.join(_get_staging_directory(), 'scripts')
if os.path.exists(path):
shutil.rmtree(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
make_sourceless(os.path.join(path, "env.py"))
sc = script.ScriptDirectory.from_config(cfg)
return sc
def clear_staging_env():
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 os.access(pyc_path, os.F_OK):
os.unlink(pyc_path)
with open(path, 'w') as f:
f.write(txt)
def _sqlite_file_db(tempname="foo.db"):
dir_ = os.path.join(_get_staging_directory(), 'scripts')
url = "sqlite:///%s/%s" % (dir_, tempname)
return engines.testing_engine(url=url)
def _sqlite_testing_config(sourceless=False):
dir_ = os.path.join(_get_staging_directory(), 'scripts')
url = "sqlite:///%s/foo.db" % dir_
return _write_config_file("""
[alembic]
script_location = %s
sqlalchemy.url = %s
sourceless = %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 sourceless else "false"))
def _multi_dir_testing_config(sourceless=False):
dir_ = os.path.join(_get_staging_directory(), 'scripts')
url = "sqlite:///%s/foo.db" % dir_
return _write_config_file("""
[alembic]
script_location = %s
sqlalchemy.url = %s
sourceless = %s
version_locations = %%(here)s/model1/ %%(here)s/model2/ %%(here)s/model3/
[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 sourceless else "false"))
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 os.access(pyc_path, os.F_OK):
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)
def make_sourceless(path):
# note that if -O is set, you'd see pyo files here,
# the pyc util function looks at sys.flags.optimize to handle this
pyc_path = util.pyc_file_from_path(path)
assert os.access(pyc_path, os.F_OK)
# look for a non-pep3147 path here.
# if not present, need to copy from __pycache__
simple_pyc_path = util.simple_pyc_file_from_path(path)
if not os.access(simple_pyc_path, os.F_OK):
shutil.copyfile(pyc_path, simple_pyc_path)
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)
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)
write_script(script, b, u("""# coding: utf-8
"Rev B, méil"
revision = '%s'
down_revision = '%s'
from alembic import op
def upgrade():
op.execute("CREATE STEP 2")
def downgrade():
op.execute("DROP STEP 2")
""") % (b, a), encoding="utf-8")
script.generate_revision(c, "revision c", refresh=True)
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 _multidb_testing_config(engines):
"""alembic.ini fixture to work exactly with the 'multidb' template"""
dir_ = os.path.join(_get_staging_directory(), 'scripts')
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
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_, databases, engines)
)
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