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# Copyright (C) 2022 Stephen Fairchild (s-fairchild@users.sourceforge.net)
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program in the file entitled COPYING.
# If not, see <http://www.gnu.org/licenses/>.
__all__ = ["main"]
_description_ = "Launch backend and keep pinging it."
import ctypes
import os
import time
from datetime import datetime
from idjc import FGlobs, PGlobs
def main():
print(_description_)
backend = ctypes.CDLL(FGlobs.backend)
read = ctypes.c_int()
write = ctypes.c_int()
if not backend.init_backend(ctypes.byref(read), ctypes.byref(write)):
print("call to init_backend failed")
return 5
print(f"file descriptors for read/write are {read.value}, {write.value}")
try:
backend_write = os.fdopen(write.value, "w")
backend_read = os.fdopen(read.value, "r")
except OSError:
"failed to open streams to backend"
return 5
print("awaiting reply")
try:
line = backend_read.readline()
except IOError as e:
print(e)
return 5
if line != "idjc backend ready\n":
print(f"bad reply from backend: {line}")
return 5
print(f"backend replies with: {line}")
def ping():
print("sending ping")
try:
backend_write.write("mx\nACTN=ping\nend\n")
backend_write.flush()
reply = backend_read.readline().rstrip() or "(none)"
print(f"reply: {reply}")
if reply != "pong":
raise ValueError
except IOError as e:
print(f"unexpected error: {e}")
reply = str(e)
except ValueError:
print(f"normally we expect pong reply: got {reply} instead")
return reply
start_time = datetime.now()
while ping() == "pong":
print(f"time elapsed = {datetime.now() - start_time}")
time.sleep(2)
return 0
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