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# jsonrpc implementation of https://www.jsonrpc.org/specification
# Copyright (c) 2016 Sourcegraph
# Copyright (c) 2019 Seven Bridges
# Copyright (C) 2022 Red Hat Inc.
#
# Retrieved from: https://github.com/rabix/benten/blob/master/benten/langserver/jsonrpc.py
#
# This file is part of systemtap, and is free software. You can
# redistribute it and/or modify it under the terms of the GNU General
# Public License (GPL); either version 2, or (at your option) any
# later version.
import json
import logging
import queue
import threading
from collections import deque
class JSONRPC2ProtocolError(Exception):
pass
class ReadWriter:
def __init__(self, reader, writer):
self.reader = reader
self.writer = writer
def readline(self, *args):
return self.reader.readline(*args).decode("utf-8")
def read(self, *args):
return self.reader.read(*args).decode("utf-8")
def write(self, out):
self.writer.write(out.encode("utf-8"))
self.writer.flush()
class JSONRPC2Connection:
def __init__(self, conn=None):
self.conn = conn
self._msg_buffer = deque()
self._next_id = 1
def _read_header_content_length(self, line):
if len(line) < 2 or line[-2:] != "\r\n":
raise JSONRPC2ProtocolError("Line endings must be \\r\\n")
if line.startswith("Content-Length: "):
_, value = line.split("Content-Length: ")
value = value.strip()
try:
return int(value)
except ValueError:
raise JSONRPC2ProtocolError(
"Invalid Content-Length header: {}".format(value))
def _receive(self):
line = self.conn.readline()
if line == "":
raise EOFError()
length = self._read_header_content_length(line)
# Keep reading headers until we find the sentinel line for the JSON
# request.
while line != "\r\n":
line = self.conn.readline()
body = self.conn.read(length)
return json.loads(body)
def read_message(self, want=None):
"""Read a JSON RPC message sent over the current connection.
If id is None, the next available message is returned.
"""
if want is None:
if self._msg_buffer:
return self._msg_buffer.popleft()
return self._receive()
# First check if our buffer contains something we want.
msg = deque_find_and_pop(self._msg_buffer, want)
if msg:
return msg
# We need to keep receiving until we find something we want.
# Things we don't want are put into the buffer for future callers.
while True:
msg = self._receive()
if want(msg):
return msg
self._msg_buffer.append(msg)
def _send(self, body):
body = json.dumps(body, separators=(",", ":"))
content_length = len(body)
response = (
"Content-Length: {}\r\n"
"Content-Type: application/vscode-jsonrpc; charset=utf-8\r\n\r\n"
"{}".format(content_length, body))
self.conn.write(response)
def write_response(self, rid, result):
body = {
"jsonrpc": "2.0",
"id": rid,
"result": result,
}
self._send(body)
def write_error(self, rid, code, message, data=None):
e = {
"code": code,
"message": message,
}
if data is not None:
e["data"] = data
body = {
"jsonrpc": "2.0",
"id": rid,
"error": e,
}
self._send(body)
def send_request(self, method: str, params):
rid = self._next_id
self._next_id += 1
body = {
"jsonrpc": "2.0",
"id": rid,
"method": method,
"params": params,
}
self._send(body)
return self.read_message(want=lambda msg: msg.get("id") == rid)
def send_notification(self, method: str, params):
body = {
"jsonrpc": "2.0",
"method": method,
"params": params,
}
self._send(body)
def send_request_batch(self, requests):
"""Pipelines requests and returns responses.
The responses is a generator where the nth response corresponds
with the nth request. Users must read the generator until the
end, otherwise you will leak a thread.
"""
# We communicate the request ids using a thread safe queue.
# It also allows us to bound the number of concurrent requests.
q = queue.Queue(100)
def send():
for method, params in requests:
rid = self._next_id
self._next_id += 1
q.put(rid)
body = {
"jsonrpc": "2.0",
"id": rid,
"method": method,
"params": params,
}
self._send(body)
# Sentinel value to indicate we are done
q.put(None)
threading.Thread(target=send).start()
while True:
rid = q.get()
if rid is None:
break
yield self.read_message(want=lambda msg: msg.get("id") == rid)
def deque_find_and_pop(d, f):
idx = None
for i, v in enumerate(d):
if f(v):
idx = i
break
if idx is None:
return None
d.rotate(-idx)
v = d.popleft()
d.rotate(idx)
return v
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