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#!/usr/bin/env python
import atexit
import os
import readline
import signal
from threading import Condition, Thread
from clingo import Control, Function, Number
class Connection:
def __init__(self):
self.condition = Condition()
self.messages = []
def receive(self, timeout=None):
self.condition.acquire()
while len(self.messages) == 0:
self.condition.wait(timeout)
message = self.messages.pop()
self.condition.release()
return message
def send(self, message):
self.condition.acquire()
self.messages.append(message)
self.condition.notify()
self.condition.release()
class Controller:
def __init__(self):
histfile = os.path.join(os.path.expanduser("~"), ".controller")
try:
readline.read_history_file(histfile)
except IOError:
pass
readline.parse_and_bind("tab: complete")
def complete(commands, text, state):
matches = []
if state == 0:
matches = [c for c in commands if c.startswith(text)]
return matches[state] if state < len(matches) else None
readline.set_completer(
lambda text, state: complete(
["more_pigeon_please", "less_pigeon_please", "solve", "exit"],
text,
state,
)
)
atexit.register(readline.write_history_file, histfile)
self.input = Connection()
self.output = None
def register_connection(self, connection):
self.output = connection
def interrupt(self, a, b):
signal.signal(signal.SIGINT, signal.SIG_IGN)
self.output.send("interrupt")
def run(self):
print("")
print("this prompt accepts the following commands:")
print(" solve - start solving")
print(" exit/EOF - terminate the solver")
print(" Ctrl-C - interrupt current search")
print(" less_pigeon_please - select an easy problem")
print(" more_pigeon_please - select a difficult problem")
print("")
pyInt = signal.getsignal(signal.SIGINT)
while True:
signal.signal(signal.SIGINT, pyInt)
try:
try:
input_ = raw_input
except NameError:
input_ = input
line = input_("> ")
signal.signal(signal.SIGINT, signal.SIG_IGN)
except EOFError:
signal.signal(signal.SIGINT, signal.SIG_IGN)
line = "exit"
print(line)
except KeyboardInterrupt:
signal.signal(signal.SIGINT, signal.SIG_IGN)
print
continue
if line == "solve":
print("Solving...")
self.output.send("solve")
signal.signal(signal.SIGINT, self.interrupt)
# NOTE: we need a timeout to catch signals
msg = self.input.receive(1000)
print(msg)
elif line == "exit":
self.output.send("exit")
break
elif line in ["less_pigeon_please", "more_pigeon_please"]:
self.output.send(line)
else:
print("unknown command: " + line)
class SolveThread(Thread):
STATE_SOLVE = 1
STATE_IDLE = 2
STATE_EXIT = 3
def __init__(self, connection):
Thread.__init__(self)
self.k = 0
self.prg = Control()
self.prg.load("client.lp")
self.prg.ground([("pigeon", []), ("sleep", [Number(self.k)])])
self.prg.assign_external(Function("sleep", [Number(self.k)]), True)
self.state = SolveThread.STATE_IDLE
self.input = Connection()
self.output = connection
def on_model(self, model):
self.output.send("answer: " + str(model)),
def on_finish(self, ret):
self.output.send(
"finish: " + str(ret) + (" (INTERRUPTED)" if ret.interrupted else "")
)
def handle_message(self, msg):
if msg == "interrupt":
self.state = SolveThread.STATE_IDLE
elif msg == "exit":
self.state = SolveThread.STATE_EXIT
elif msg == "less_pigeon_please":
self.prg.assign_external(Function("p"), False)
self.state = SolveThread.STATE_IDLE
elif msg == "more_pigeon_please":
self.prg.assign_external(Function("p"), True)
self.state = SolveThread.STATE_IDLE
elif msg == "solve":
self.state = SolveThread.STATE_SOLVE
else:
raise (RuntimeError("unexpected message: " + msg))
def run(self):
while True:
if self.state == SolveThread.STATE_SOLVE:
f = self.prg.solve(
on_model=self.on_model, on_finish=self.on_finish, async_=True
)
msg = self.input.receive()
if self.state == SolveThread.STATE_SOLVE:
f.cancel()
ret = f.get()
else:
ret = None
self.handle_message(msg)
if self.state == SolveThread.STATE_EXIT:
return
elif ret is not None and not ret.unknown:
self.k = self.k + 1
self.prg.ground([("sleep", [Number(self.k)])])
self.prg.release_external(Function("sleep", [Number(self.k - 1)]))
self.prg.assign_external(Function("sleep", [Number(self.k)]), True)
ct = Controller()
st = SolveThread(ct.input)
ct.register_connection(st.input)
st.start()
ct.run()
st.join()
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