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Copy pathpython_server.py
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214 lines (171 loc) · 6.41 KB
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import ast
import contextlib
import io
import json
import sys
import traceback
import uuid
from pathlib import Path
from typing import Dict, List, Optional, Union
STDIN = sys.stdin
STDOUT = sys.stdout
STDERR = sys.stderr
USER_GLOBALS = {}
def _send_message(msg: str):
# Content-Length is the data size in bytes.
length_msg = len(msg.encode())
STDOUT.buffer.write(f"Content-Length: {length_msg}\r\n\r\n{msg}".encode())
STDOUT.buffer.flush()
def send_message(**kwargs):
_send_message(json.dumps({"jsonrpc": "2.0", **kwargs}))
def print_log(msg: str):
send_message(method="log", params=msg)
def send_response(
response: str,
response_id: int,
execution_status: bool = True, # noqa: FBT001, FBT002
):
send_message(
id=response_id,
result={"status": execution_status, "output": response},
)
def send_request(params: Optional[Union[List, Dict]] = None):
request_id = uuid.uuid4().hex
if params is None:
send_message(id=request_id, method="input")
else:
send_message(id=request_id, method="input", params=params)
return request_id
original_input = input
def custom_input(prompt=""):
try:
send_request({"prompt": prompt})
headers = get_headers()
# Content-Length is the data size in bytes.
content_length = int(headers.get("Content-Length", 0))
if content_length:
message_text = STDIN.buffer.read(content_length).decode()
message_json = json.loads(message_text)
return message_json["result"]["userInput"]
except EOFError:
# Input stream closed, exit gracefully
sys.exit(0)
except Exception:
print_log(traceback.format_exc())
# Set input to our custom input
USER_GLOBALS["input"] = custom_input
input = custom_input # noqa: A001
def handle_response(request_id):
while True:
try:
headers = get_headers()
# Content-Length is the data size in bytes.
content_length = int(headers.get("Content-Length", 0))
if content_length:
message_text = STDIN.buffer.read(content_length).decode()
message_json = json.loads(message_text)
our_user_input = message_json["result"]["userInput"]
if message_json["id"] == request_id:
send_response(our_user_input, message_json["id"])
elif message_json["method"] == "exit":
sys.exit(0)
except EOFError: # noqa: PERF203
# Input stream closed, exit gracefully
sys.exit(0)
except Exception:
print_log(traceback.format_exc())
def exec_function(user_input):
try:
compile(user_input, "<stdin>", "eval")
except SyntaxError:
return exec
return eval
def check_valid_command(request):
try:
user_input = request["params"]
ast.parse(user_input[0])
send_response("True", request["id"])
except SyntaxError:
send_response("False", request["id"])
def execute(request, user_globals):
str_output = CustomIO("<stdout>", encoding="utf-8")
str_error = CustomIO("<stderr>", encoding="utf-8")
str_input = CustomIO("<stdin>", encoding="utf-8", newline="\n")
with contextlib.redirect_stdout(str_output), contextlib.redirect_stderr(str_error):
original_stdin = sys.stdin
try:
sys.stdin = str_input
execution_status = exec_user_input(request["params"], user_globals)
finally:
sys.stdin = original_stdin
send_response(str_output.get_value(), request["id"], execution_status)
def exec_user_input(user_input, user_globals) -> bool:
user_input = user_input[0] if isinstance(user_input, list) else user_input
try:
callable_ = exec_function(user_input)
retval = callable_(user_input, user_globals)
if retval is not None:
print(retval)
return True
except KeyboardInterrupt:
print(traceback.format_exc())
return False
except Exception:
print(traceback.format_exc())
return False
class CustomIO(io.TextIOWrapper):
"""Custom stream object to replace stdio."""
def __init__(self, name, encoding="utf-8", newline=None):
self._buffer = io.BytesIO()
self._custom_name = name
super().__init__(self._buffer, encoding=encoding, newline=newline)
def close(self):
"""Provide this close method which is used by some tools."""
# This is intentionally empty.
def get_value(self) -> str:
"""Returns value from the buffer as string."""
self.seek(0)
return self.read()
def get_headers():
headers = {}
while True:
raw = STDIN.buffer.readline()
# Detect EOF: readline() returns empty bytes when input stream is closed
if raw == b"":
raise EOFError("EOF reached while reading headers")
line = raw.decode().strip()
if not line:
break
name, value = line.split(":", 1)
headers[name] = value.strip()
return headers
if __name__ == "__main__":
# https://docs.python.org/3/tutorial/modules.html#the-module-search-path
# The directory containing the input script (or the current directory when no file is specified).
# Here we emulate the same behavior like no file is specified.
input_script_dir = Path(__file__).parent
script_dir_str = str(input_script_dir)
if script_dir_str in sys.path:
sys.path.remove(script_dir_str)
while "" in sys.path:
sys.path.remove("")
sys.path.insert(0, "")
while True:
try:
headers = get_headers()
# Content-Length is the data size in bytes.
content_length = int(headers.get("Content-Length", 0))
if content_length:
request_text = STDIN.buffer.read(content_length).decode()
request_json = json.loads(request_text)
if request_json["method"] == "execute":
execute(request_json, USER_GLOBALS)
if request_json["method"] == "check_valid_command":
check_valid_command(request_json)
elif request_json["method"] == "exit":
sys.exit(0)
except EOFError: # noqa: PERF203
# Input stream closed (VS Code terminated), exit gracefully
sys.exit(0)
except Exception:
print_log(traceback.format_exc())