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|
#!/usr/bin/env python3
# : out que
"""
simple client for que.run
"""
import argparse
import configparser
import functools
import http.client
import logging
import os
import subprocess
import sys
import textwrap
import time
import urllib.parse
import urllib.request as request
import typing
MAX_TIMEOUT = 9999999
RETRIES = 10
DELAY = 3
BACKOFF = 1
def auth(args: argparse.Namespace) -> typing.Union[str, None]:
"Returns the auth key for the given ns from ~/.config/que.conf"
logging.debug("auth")
namespace = args.target.split("/")[0]
if namespace == "pub":
return None
conf_file = os.path.expanduser("~/.config/que.conf")
if not os.path.exists(conf_file):
sys.exit("you need a ~/.config/que.conf")
cfg = configparser.ConfigParser()
cfg.read(conf_file)
return cfg[namespace]["key"]
def autodecode(bytestring: bytes) -> typing.Any:
"""Attempt to decode bytes into common codecs, preferably utf-8. If no
decoding is available, just return the raw bytes.
For all available codecs, see:
<https://docs.python.org/3/library/codecs.html#standard-encodings>
"""
logging.debug("autodecode")
codecs = ["utf-8", "ascii"]
for codec in codecs:
try:
return bytestring.decode(codec)
except UnicodeDecodeError:
pass
return bytestring
@typing.no_type_check
def retry(
exception: str,
tries: typing.Any = RETRIES,
delay: typing.Any = DELAY,
backoff: typing.Any = BACKOFF,
) -> typing.Any:
"Decorator for retrying an action."
def decorator(func: typing.Any) -> typing.Any:
@functools.wraps(func)
def func_retry(*args: typing.Any, **kwargs: typing.Any) -> typing.Any:
mtries, mdelay = tries, delay
while mtries > 1:
try:
return func(*args, **kwargs)
except exception as ex:
logging.debug(ex)
logging.debug("retrying...")
time.sleep(mdelay)
mtries -= 1
mdelay *= backoff
return func(*args, **kwargs)
return func_retry
return decorator
@typing.no_type_check
@retry(urllib.error.URLError)
@retry(http.client.IncompleteRead)
@retry(http.client.RemoteDisconnected)
def send(args: argparse.Namespace) -> None:
"Send a message to the que."
logging.debug("send")
key = auth(args)
data = args.infile
req = request.Request(f"{args.host}/{args.target}")
req.add_header("User-Agent", "Que/Client")
req.add_header("Content-Type", "text/plain;charset=utf-8")
if key:
req.add_header("Authorization", key)
if args.serve:
logging.debug("serve")
while not time.sleep(1):
# pylint: disable=consider-using-with
request.urlopen(req, data=data, timeout=MAX_TIMEOUT)
else:
# pylint: disable=consider-using-with
request.urlopen(req, data=data, timeout=MAX_TIMEOUT)
def then(args: argparse.Namespace, msg: str) -> None:
"Perform an action when passed `--then`."
if args.then:
logging.debug("then")
subprocess.run(
args.then.format(msg=msg, que=args.target),
check=False,
shell=True,
)
@typing.no_type_check
@retry(urllib.error.URLError)
@retry(http.client.IncompleteRead)
@retry(http.client.RemoteDisconnected)
def recv(args: argparse.Namespace) -> None:
"Receive a message from the que."
logging.debug("recv on: %s", args.target)
if args.poll:
req = request.Request(f"{args.host}/{args.target}/stream")
else:
req = request.Request(f"{args.host}/{args.target}")
req.add_header("User-Agent", "Que/Client")
key = auth(args)
if key:
req.add_header("Authorization", key)
with request.urlopen(req) as _req:
if args.poll:
logging.debug("polling")
while not time.sleep(1):
reply = _req.readline()
if reply:
msg = autodecode(reply)
logging.debug("read")
print(msg, end="")
then(args, msg)
else:
continue
else:
msg = autodecode(_req.readline())
print(msg)
then(args, msg)
def get_args() -> argparse.Namespace:
"Command line parser"
cli = argparse.ArgumentParser(
description=__doc__,
epilog=textwrap.dedent(
f"""Requests will retry up to {RETRIES} times, with {DELAY} seconds
between attempts."""
),
)
cli.add_argument("test", action="store_true", help="run tests")
cli.add_argument("--debug", action="store_true", help="log to stderr")
cli.add_argument(
"--host", default="http://que.run", help="where que-server is running"
)
cli.add_argument(
"--poll",
default=False,
action="store_true",
help=textwrap.dedent(
"""keep the connection open to stream data from the que. without
this flag, the program will exit after receiving a message"""
),
)
cli.add_argument(
"--then",
help=textwrap.dedent(
"""when polling, run this shell command after each response,
presumably for side effects, replacing '{que}' with the target and
'{msg}' with the body of the response"""
),
)
cli.add_argument(
"--serve",
default=False,
action="store_true",
help=textwrap.dedent(
"""when posting to the que, do so continuously in a loop. this can
be used for serving a webpage or other file continuously"""
),
)
cli.add_argument("target", help="namespace and path of the que, like 'ns/path'")
cli.add_argument(
"infile",
nargs="?",
type=argparse.FileType("rb"),
help="data to put on the que. use '-' for stdin, otherwise should be a readable file",
)
return cli.parse_args()
if __name__ == "__main__":
ARGV = get_args()
if ARGV.test:
print("ok")
sys.exit()
if ARGV.debug:
logging.basicConfig(
format="%(asctime)s: %(levelname)s: %(message)s",
level=logging.DEBUG,
datefmt="%Y.%m.%d..%H.%M.%S",
)
try:
if ARGV.infile:
send(ARGV)
else:
recv(ARGV)
except KeyboardInterrupt:
sys.exit(0)
|
