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"""A simple server built on Jeepney's blocking integration.
Start this, and then run blocking_server_client.py to send requests to it.
"""
import signal
from threading import Thread
import time
from jeepney import MessageType, HeaderFields, new_method_return, new_error
from jeepney.bus_messages import message_bus
from jeepney.io.threading import (
open_dbus_connection, DBusRouter, Proxy, ReceiveStopped,
)
SERVER_NAME = "io.gitlab.takluyver.jeepney.examples.Server"
def slow_double(n):
# Simulate something slow which releases the GIL so other threads can run
time.sleep(5)
return n * 2
def double(n):
return n * 2
def divide(n, d):
return n / d
def serve(conn, i):
while True:
try:
msg = conn.receive()
except ReceiveStopped:
return
if msg.header.message_type != MessageType.method_call:
print("Received non-method-call message:", msg)
method = msg.header.fields[HeaderFields.member]
print(f"Thread {i}: Message {msg.header.serial} calls {method}")
# Dispatch to different methods
if method == 'slow_double':
res = slow_double(msg.body[0])
print(f"Delayed reply to {msg.header.serial}: {res}")
rep = new_method_return(msg, 'i', (res,))
elif method == 'double':
res = double(msg.body[0])
rep = new_method_return(msg, 'i', (res,))
elif method == 'divide':
try:
res = divide(*msg.body)
except ZeroDivisionError:
rep = new_error(msg, SERVER_NAME + ".Error.DivideByZero")
else:
rep = new_method_return(msg, 'd', (res,))
else:
rep = new_error(msg, SERVER_NAME + '.Error.NoMethod')
conn.send(rep)
with open_dbus_connection() as conn:
print("My unique name is:", conn.unique_name)
# Request an additional name on the message bus
with DBusRouter(conn) as router:
bus_proxy = Proxy(message_bus, router, timeout=10)
if bus_proxy.RequestName(SERVER_NAME) == (1,):
# 1 == DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER
print("Got name", SERVER_NAME)
threads = [Thread(target=serve, args=(conn, i)) for i in range(4)]
for t in threads:
t.start()
try:
signal.pause() # Wait for Ctrl-C
except KeyboardInterrupt:
pass
conn.interrupt()
for t in threads:
t.join()
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