generated from itdominator/Python-With-Gtk-Template
105 lines
3.2 KiB
Python
105 lines
3.2 KiB
Python
from __future__ import print_function
|
|
|
|
import threading
|
|
import json
|
|
|
|
from . import lsp_structs
|
|
|
|
|
|
|
|
JSON_RPC_REQ_FORMAT = "Content-Length: {json_string_len}\r\n\r\n{json_string}"
|
|
LEN_HEADER = "Content-Length: "
|
|
TYPE_HEADER = "Content-Type: "
|
|
|
|
|
|
# TODO: add content-type
|
|
|
|
|
|
class MyEncoder(json.JSONEncoder):
|
|
"""
|
|
Encodes an object in JSON
|
|
"""
|
|
|
|
def default(self, o): # pylint: disable=E0202
|
|
return o.__dict__
|
|
|
|
|
|
class JsonRpcEndpoint(object):
|
|
'''
|
|
Thread safe JSON RPC endpoint implementation. Responsible to recieve and
|
|
send JSON RPC messages, as described in the protocol. More information can
|
|
be found: https://www.jsonrpc.org/
|
|
'''
|
|
|
|
def __init__(self, stdin, stdout):
|
|
self.stdin = stdin
|
|
self.stdout = stdout
|
|
self.read_lock = threading.Lock()
|
|
self.write_lock = threading.Lock()
|
|
|
|
@staticmethod
|
|
def __add_header(json_string):
|
|
'''
|
|
Adds a header for the given json string
|
|
|
|
:param str json_string: The string
|
|
:return: the string with the header
|
|
'''
|
|
return JSON_RPC_REQ_FORMAT.format(json_string_len = len(json_string), json_string = json_string)
|
|
|
|
def send_request(self, message):
|
|
'''
|
|
Sends the given message.
|
|
|
|
:param dict message: The message to send.
|
|
'''
|
|
json_string = json.dumps(message, cls = MyEncoder)
|
|
jsonrpc_req = self.__add_header(json_string)
|
|
with self.write_lock:
|
|
self.stdin.write(jsonrpc_req.encode())
|
|
self.stdin.flush()
|
|
|
|
def recv_response(self):
|
|
'''
|
|
Recives a message.
|
|
|
|
:return: a message
|
|
'''
|
|
with self.read_lock:
|
|
message_size = None
|
|
while True:
|
|
# read header
|
|
line = self.stdout.readline()
|
|
if not line:
|
|
# server quit
|
|
return None
|
|
line = line.decode("utf-8")
|
|
if not line.endswith("\r\n"):
|
|
raise lsp_structs.ResponseError(
|
|
lsp_structs.ErrorCodes.ParseError,
|
|
"Bad header: missing newline")
|
|
# remove the "\r\n"
|
|
line = line[:-2]
|
|
if line == "":
|
|
# done with the headers
|
|
break
|
|
elif line.startswith(LEN_HEADER):
|
|
line = line[len(LEN_HEADER):]
|
|
if not line.isdigit():
|
|
raise lsp_structs.ResponseError(
|
|
lsp_structs.ErrorCodes.ParseError,
|
|
"Bad header: size is not int")
|
|
message_size = int(line)
|
|
elif line.startswith(TYPE_HEADER):
|
|
...
|
|
else:
|
|
raise lsp_structs.ResponseError(
|
|
lsp_structs.ErrorCodes.ParseError,
|
|
"Bad header: unkown header")
|
|
if not message_size:
|
|
raise lsp_structs.ResponseError(
|
|
lsp_structs.ErrorCodes.ParseError,
|
|
"Bad header: missing size")
|
|
|
|
jsonrpc_res = self.stdout.read(message_size).decode("utf-8")
|
|
return json.loads(jsonrpc_res) |