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#!/usr/bin/python
#
# Server that will accept connections from a Vim channel.
# Run this server and then in Vim you can open the channel:
# :let handle = ch_open('localhost:8765', 'json')
#
# Then Vim can send requests to the server:
# :let response = ch_sendexpr(handle, 'hello!')
#
# See ":help channel-demo" in Vim.
#
# This requires Python 2.6 or later.
from __future__ import print_function
import json
import socket
import sys
import threading
try:
# Python 3
import socketserver
except ImportError:
# Python 2
import SocketServer as socketserver
class ThreadedTCPRequestHandler(socketserver.BaseRequestHandler):
def handle(self):
print("=== socket opened ===")
while True:
try:
received = self.request.recv(4096).decode('utf-8')
except socket.error:
print("=== socket error ===")
break
except IOError:
print("=== socket closed ===")
break
if received == '':
print("=== socket closed ===")
break
print("received: {}".format(received))
# We may receive two messages at once. Take the part up to the
# matching "]" (recognized by finding "][").
todo = received
while todo != '':
splitidx = todo.find('][')
if splitidx < 0:
used = todo
todo = ''
else:
used = todo[:splitidx + 1]
todo = todo[splitidx + 1:]
if used != received:
print("using: {}".format(used))
try:
decoded = json.loads(used)
except ValueError:
print("json decoding failed")
decoded = [-1, '']
# Send a response if the sequence number is positive.
if decoded[0] >= 0:
if decoded[1] == 'hello!':
# simply send back a string
response = "got it"
elif decoded[1] == 'make change':
# Send two ex commands at the same time, before replying to
# the request.
cmd = '["ex","call append(\\"$\\",\\"added1\\")"]'
cmd += '["ex","call append(\\"$\\",\\"added2\\")"]'
print("sending: {}".format(cmd))
self.request.sendall(cmd.encode('utf-8'))
response = "ok"
elif decoded[1] == 'eval-works':
# Send an eval request. We ignore the response.
cmd = '["eval","\\"foo\\" . 123", -1]'
print("sending: {}".format(cmd))
self.request.sendall(cmd.encode('utf-8'))
response = "ok"
elif decoded[1] == 'eval-fails':
# Send an eval request that will fail.
cmd = '["eval","xxx", -2]'
print("sending: {}".format(cmd))
self.request.sendall(cmd.encode('utf-8'))
response = "ok"
elif decoded[1] == 'eval-result':
# Send back the last received eval result.
response = last_eval
elif decoded[1] == '!quit!':
# we're done
sys.exit(0)
elif decoded[1] == '!crash!':
# Crash!
42 / 0
else:
response = "what?"
encoded = json.dumps([decoded[0], response])
print("sending: {}".format(encoded))
self.request.sendall(encoded.encode('utf-8'))
# Negative numbers are used for "eval" responses.
elif decoded[0] < 0:
last_eval = decoded
class ThreadedTCPServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
pass
if __name__ == "__main__":
HOST, PORT = "localhost", 0
server = ThreadedTCPServer((HOST, PORT), ThreadedTCPRequestHandler)
ip, port = server.server_address
# Start a thread with the server -- that thread will then start one
# more thread for each request
server_thread = threading.Thread(target=server.serve_forever)
# Exit the server thread when the main thread terminates
server_thread.daemon = True
server_thread.start()
# Write the port number in Xportnr, so that the test knows it.
f = open("Xportnr", "w")
f.write("{}".format(port))
f.close()
# Block here
print("Listening on port {}".format(port))
server.serve_forever()
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