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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')
#
# Then Vim can send requests to the server:
# :let response = ch_sendexpr(handle, 'hello!')
#
# And you can control Vim by typing a JSON message here, e.g.:
# ["ex","echo 'hi there'"]
#
# There is no prompt, just type a line and press Enter.
# To exit cleanly type "quit<Enter>".
#
# 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
thesocket = None
class ThreadedTCPRequestHandler(socketserver.BaseRequestHandler):
def handle(self):
print("=== socket opened ===")
global thesocket
thesocket = self.request
while True:
try:
data = self.request.recv(4096).decode('utf-8')
except socket.error:
print("=== socket error ===")
break
if data == '':
print("=== socket closed ===")
break
print("received: {0}".format(data))
try:
decoded = json.loads(data)
except ValueError:
print("json decoding failed")
decoded = [-1, '']
# Send a response if the sequence number is positive.
# Negative numbers are used for "eval" responses.
if decoded[0] >= 0:
if decoded[1] == 'hello!':
response = "got it"
id = decoded[0]
elif decoded[1] == 'hello channel!':
response = "got that"
# response is not to a specific message callback but to the
# channel callback, need to use ID zero
id = 0
else:
response = "what?"
id = decoded[0]
encoded = json.dumps([id, response])
print("sending {0}".format(encoded))
self.request.sendall(encoded.encode('utf-8'))
thesocket = None
class ThreadedTCPServer(socketserver.ThreadingMixIn, socketserver.TCPServer):
pass
if __name__ == "__main__":
HOST, PORT = "localhost", 8765
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()
print("Server loop running in thread: ", server_thread.name)
print("Listening on port {0}".format(PORT))
while True:
typed = sys.stdin.readline()
if "quit" in typed:
print("Goodbye!")
break
if thesocket is None:
print("No socket yet")
else:
print("sending {0}".format(typed))
thesocket.sendall(typed.encode('utf-8'))
server.shutdown()
server.server_close()
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