Files
galaxy-integrations-python-api/galaxy/api/stream.py
2019-02-11 11:07:57 +01:00

36 lines
1.1 KiB
Python

import asyncio
import sys
class StdinReader():
def __init__(self):
self._stdin = sys.stdin.buffer
async def readline(self):
# a single call to sys.stdin.readline() is thread-safe
loop = asyncio.get_running_loop()
return await loop.run_in_executor(None, self._stdin.readline)
class StdoutWriter():
def __init__(self):
self._buffer = []
self._stdout = sys.stdout.buffer
def write(self, data):
self._buffer.append(data)
async def drain(self):
data, self._buffer = self._buffer, []
# a single call to sys.stdout.writelines() is thread-safe
def write(data):
sys.stdout.writelines(data)
sys.stdout.flush()
loop = asyncio.get_running_loop()
return await loop.run_in_executor(None, write, data)
def stdio():
# no support for asyncio stdio yet on Windows, see https://bugs.python.org/issue26832
# use an executor to read from stdio and write to stdout
# note: if nothing ever drains the writer explicitly, no flushing ever takes place!
return StdinReader(), StdoutWriter()