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new python cmdsrv wrapper - DO NOT MERGE #825

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5 changes: 5 additions & 0 deletions roles/xsce-admin/templates/console/cmd-service.conf
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Original file line number Diff line number Diff line change
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WSGIScriptAlias /cmd-service /opt/schoolserver/admin_console/cmd-service.wsgi

#AddType text/html .py

#AddHandler wsgi-script .wsgi
79 changes: 79 additions & 0 deletions roles/xsce-admin/templates/console/cmd-service.wsgi
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import zmq
import os.path
import time

alert_param = ',"Alert": "True"}'

def application(environ, start_response):
start_ms = time.time()

if environ['REQUEST_METHOD'] == 'POST':
try:
request_body_size = int(environ.get('CONTENT_LENGTH', 0))
except (ValueError):
request_body_size = 0

request_body = environ['wsgi.input'].read(request_body_size)
# request_body holds command=<text of cmd>

if os.path.exists("/var/run/xsce-cmdsrv.pid"):
if os.path.exists("/var/run/xsce-cmdsrv-ready"):
cmd = request_body.split('=')[1]
response_body = send_command(cmd, start_ms)
else:
response_body = '{"Error": "XSCE-CMDSRV has started but is not ready."' + alert_param
else:
response_body = '{"Error": "XSCE-CMDSRV has started but is not ready."' + alert_param

response_headers = [('Content-type', 'application/json'), ('Content-Length', str(len(response_body)))]

else: # not a POST
response_body = dump(environ)
response_headers = [('Content-type', 'text/plain'),
('Content-Length', str(len(response_body)))]
status = '200 OK'
start_response(status, response_headers)
return [response_body]

def dump(environ):
response_body = ['%s: %s' % (key, value) for key, value in sorted(environ.items())]
response_body = '\n'.join(response_body)
return response_body

def send_command(cmd, start_ms):

REQUEST_TIMEOUT = 30000
send_msg = cmd

ipc_sock = "/run/cmdsrv_sock"

try:
context = zmq.Context()
print "Connecting to server..."
socket = context.socket(zmq.DEALER)
socket.connect ("ipc://%s" % ipc_sock)
# socket.setsockopt(zmq.SOCKOPT_LINGER, 0) this should be the default for close() and is not in python binding
poll = zmq.Poller()
poll.register(socket, zmq.POLLIN)

socket.send (send_msg)
socks = dict(poll.poll(REQUEST_TIMEOUT))

if socket in socks and socks[socket] == zmq.POLLIN:
reply_msg = socket.recv()
if '"Error":' not in reply_msg:
cur_ms = time.time()
elapsed_ms = cur_ms - start_ms
reply_msg = '{"Data": ' + reply_msg + ',"Resp_time": "' + str(elapsed_ms) + '"}'
else:
reply_msg = '{"Error": "No Response from XSCE-CMDSRV in ' + REQUEST_TIMEOUT + ' milliseconds"' + alert_param

socket.setsockopt(zmq.LINGER, 0)
socket.close()
poll.unregister(socket)

except Exception as e:
reply_msg = '{"Error": "' + e.message + '"' + alert_param

return reply_msg