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#!/usr/bin/env python3
"""
simple client for que.run
"""
import argparse
import configparser
import http.client
import os
import subprocess
import sys
import time
import urllib.parse
import urllib.request as request
MAX_TIMEOUT = 99999999 # basically never timeout
def auth(args):
"Returns the auth key for the given ns from ~/.config/que.conf"
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 send(args):
"Send a message to the que."
key = auth(args)
data = args.infile
req = request.Request(f"{args.host}/{args.target}")
req.add_header("User-AgenT", "Que/Client")
if key:
req.add_header("Authorization", key)
if args.serve:
while not time.sleep(1):
request.urlopen(req, data=data, timeout=MAX_TIMEOUT)
else:
request.urlopen(req, data=data, timeout=MAX_TIMEOUT)
def recv(args):
"Receive a message from the que."
def _recv(_req):
msg = autodecode(_req.read())
print(msg)
if args.then:
subprocess.run(
args.then.replace(r"\msg", msg).replace(r"que", args.target),
shell=True,
check=False,
)
params = urllib.parse.urlencode({"poll": args.poll})
req = request.Request(f"{args.host}/{args.target}?{params}")
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:
while not time.sleep(1):
_recv(_req)
else:
_recv(_req)
def autodecode(bytestring):
"""Attempt to decode bytes `bs` 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>
"""
codecs = ["utf-8", "ascii"]
for codec in codecs:
try:
return bytestring.decode(codec)
except UnicodeDecodeError:
pass
return bytestring
def get_args():
"Command line parser"
cli = argparse.ArgumentParser(description=__doc__)
cli.add_argument(
"--host", default="http://que.run", help="where que-server is running"
)
cli.add_argument(
"--poll", default=False, action="store_true", help="stream data from the que"
)
cli.add_argument(
"--then",
help=" ".join(
[
"when polling, run this shell command after each response,",
"presumably for side effects,"
r"replacing '\que' with the target and '\msg' with the body of the response",
]
),
)
cli.add_argument(
"--serve",
default=False,
action="store_true",
help=" ".join(
[
"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/subpath'"
)
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()
try:
if ARGV.infile:
send(ARGV)
else:
recv(ARGV)
except KeyboardInterrupt:
sys.exit(0)
except urllib.error.HTTPError as err:
print(err)
sys.exit(1)
except http.client.RemoteDisconnected as err:
print("disconnected... retrying in 5 seconds")
time.sleep(5)
if ARGV.infile:
send(ARGV)
else:
recv(ARGV)
|
