Add a screen in the admin to launch commands. Fix bug #4 (https://github.com/IRI-Research/plan4learning/issues/4).
# -*- coding: utf-8 -*-
#
# Copyright IRI (c) 2013
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'''
Created on Oct 9, 2013
@author: ymh
'''
import itertools
import os
import signal
from subprocess import PIPE, Popen, STDOUT
import time
import uuid
from django.conf import settings
from django.http.response import StreamingHttpResponse, HttpResponse
from django.utils.translation import ugettext
from django.views.generic.base import TemplateView, View
class ConfirmScriptView(TemplateView):
template_name = "p4l/admin/confirm_run_script.html"
def get_context_data(self, **kwargs):
return {
'command_line' : " ".join(getattr(settings,"ADMIN_SCRIPT", {}).get('command',"")),
'env' : repr(getattr(settings,"ADMIN_SCRIPT", {}).get('env',{})),
'cwd' : repr(getattr(settings,"ADMIN_SCRIPT", {}).get('cwd',"")),
}
class RunScriptView(View):
def __init__(self, **kwargs):
View.__init__(self, **kwargs)
self.boundary = "--BOUNDARY--==--%s" % str(uuid.uuid4())
def get(self, request):
resp = StreamingHttpResponse()
command_kwargs = {
'shell':False,
'env':None,
'cwd':None
}
admin_script = getattr(settings,"ADMIN_SCRIPT", {})
command = admin_script.get('args',"")
if not command:
return resp
command_kwargs.update(admin_script,
stdout=PIPE,
stderr=STDOUT,
bufsize=0,
close_fds=True,
preexec_fn=os.setsid
)
resp['Connection'] = "Keep-Alive"
doc_start = [
'<!DOCTYPE html>',
'<html lang="en">',
'<head>',
'<meta charset="utf-8">',
'<title>output</title>',
'<style>body {font-family: monospace; white-space: pre;}</style>',
'</head>',
'<body>',
]
doc_end = [
'<script>parent.done();</script>',
'</html>',
'</body>'
]
scroll_to_bottom = '<script type="text/javascript">window.scrollBy(0,50);</script>'
process = Popen(**command_kwargs)
# Save the pid in the user's session (a thread-safe place)
request.session['pid'] = process.pid
def read_output():
for line in iter(process.stdout.readline, b''):
yield "%s%s" %(line, scroll_to_bottom)
resp.streaming_content = itertools.chain(doc_start, read_output(), doc_end)
return resp
def check_pid(pid):
""" Check For the existence of a unix pid. """
try:
os.kill(pid, 0)
except OSError:
return False
else:
return True
class KillScriptView(View):
def get(self, request):
resp = HttpResponse()
pid = request.session.get('pid', None)
if not pid:
resp.content = ugettext("No active process to kill")
else:
os.kill(pid, signal.SIGINT)
i = 0
while i <= settings.SCRIPT_MAX_WAIT and check_pid(pid):
time.sleep(settings.SCRIPT_WAIT)
i += 1
if check_pid(pid):
os.killpg(pid, signal.SIGKILL)
resp.content = ugettext("Success: The process was killed successfully.")
return resp