import enum
import attr
from ..driver import ShellDriver
from ..factory import target_factory
from ..protocol import PowerProtocol
from ..step import step
from .common import Strategy, StrategyError
[docs]class Status(enum.Enum):
unknown = 0
off = 1
shell = 2
[docs]@target_factory.reg_driver
@attr.s(eq=False)
class ShellStrategy(Strategy):
"""ShellStrategy - Strategy to switch to shell"""
bindings = {
"power": PowerProtocol,
"shell": ShellDriver,
}
status = attr.ib(default=Status.unknown)
[docs] def __attrs_post_init__(self):
super().__attrs_post_init__()
[docs] @step(args=['status'])
def transition(self, status, *, step):
if not isinstance(status, Status):
status = Status[status]
if status == Status.unknown:
raise StrategyError("can not transition to {}".format(status))
elif status == self.status:
step.skip("nothing to do")
return # nothing to do
elif status == Status.off:
self.target.deactivate(self.shell)
self.target.activate(self.power)
self.power.off()
elif status == Status.shell:
self.transition(Status.off) # pylint: disable=missing-kwoa
self.power.cycle()
self.target.activate(self.shell)
else:
raise StrategyError(
"no transition found from {} to {}".
format(self.status, status)
)
self.status = status
[docs] @step(args=['status'])
def force(self, status, *, step):
if not isinstance(status, Status):
status = Status[status]
if status == Status.unknown:
raise StrategyError("can not force state {}".format(status))
elif status == Status.off:
self.target.deactivate(self.shell)
self.target.activate(self.power)
elif status == Status.shell:
self.target.activate(self.power)
self.target.activate(self.shell)
else:
raise StrategyError("not setup found for {}".format(status))
self.status = status