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"""
Support for discovery using GDM (Good Day Mate), multicast protocol by Plex.
Inspired by
hippojay's plexGDM:
https://github.com/hippojay/script.plexbmc.helper/resources/lib/plexgdm.py
iBaa's PlexConnect: https://github.com/iBaa/PlexConnect/PlexAPI.py
"""
import socket
import struct
class GDM:
"""Base class to discover GDM services."""
def __init__(self):
self.entries = []
self.last_scan = None
def scan(self):
"""Scan the network."""
self.update()
def all(self):
"""Return all found entries.
Will scan for entries if not scanned recently.
"""
self.scan()
return list(self.entries)
def find_by_content_type(self, value):
"""Return a list of entries that match the content_type."""
self.scan()
return [entry for entry in self.entries
if value in entry['data']['Content_Type']]
def find_by_data(self, values):
"""Return a list of entries that match the search parameters."""
self.scan()
return [entry for entry in self.entries
if all(item in entry['data'].items()
for item in values.items())]
def update(self):
"""Scan for new GDM services.
Example of the dict list assigned to self.entries by this function:
[{'data': {
'Content-Type': 'plex/media-server',
'Host': '53f4b5b6023d41182fe88a99b0e714ba.plex.direct',
'Name': 'myfirstplexserver',
'Port': '32400',
'Resource-Identifier': '646ab0aa8a01c543e94ba975f6fd6efadc36b7',
'Updated-At': '1444852697',
'Version': '0.9.12.13.1464-4ccd2ca',
},
'from': ('10.10.10.100', 32414)}]
"""
gdm_ip = '239.0.0.250' # multicast to PMS
gdm_port = 32414
gdm_msg = 'M-SEARCH * HTTP/1.0'.encode('ascii')
gdm_timeout = 1
self.entries = []
# setup socket for discovery -> multicast message
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.settimeout(gdm_timeout)
# Set the time-to-live for messages for local network
sock.setsockopt(socket.IPPROTO_IP,
socket.IP_MULTICAST_TTL,
struct.pack("B", gdm_timeout))
try:
# Send data to the multicast group
sock.sendto(gdm_msg, (gdm_ip, gdm_port))
# Look for responses from all recipients
while True:
try:
data, server = sock.recvfrom(1024)
data = data.decode('utf-8')
if '200 OK' in data.splitlines()[0]:
data = {k: v.strip() for (k, v) in (
line.split(':') for line in
data.splitlines() if ':' in line)}
self.entries.append({'data': data,
'from': server})
except socket.timeout:
break
finally:
sock.close()
def main():
"""Test GDM discovery."""
from pprint import pprint
gdm = GDM()
pprint("Scanning GDM...")
gdm.update()
pprint(gdm.entries)
if __name__ == "__main__":
main()
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