Filename: //usr//bin/mesa-overlay-control.py

#!/usr/bin/env python3 import os import socket import sys import select from select import EPOLLIN, EPOLLPRI, EPOLLERR import time from collections import namedtuple import argparse TIMEOUT = 1.0 # seconds VERSION_HEADER = bytearray('MesaOverlayControlVersion', 'utf-8') DEVICE_NAME_HEADER = bytearray('DeviceName', 'utf-8') MESA_VERSION_HEADER = bytearray('MesaVersion', 'utf-8') DEFAULT_SERVER_ADDRESS = "\0mesa_overlay" class Connection: def __init__(self, path): # Create a Unix Domain socket and connect sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) try: sock.connect(path) except socket.error as msg: print(msg) sys.exit(1) self.sock = sock # initialize poll interface and register socket epoll = select.epoll() epoll.register(sock, EPOLLIN | EPOLLPRI | EPOLLERR) self.epoll = epoll def recv(self, timeout): ''' timeout as float in seconds returns: - None on error or disconnection - bytes() (empty) on timeout ''' events = self.epoll.poll(timeout) for ev in events: (fd, event) = ev if fd != self.sock.fileno(): continue # check for socket error if event & EPOLLERR: return None # EPOLLIN or EPOLLPRI, just read the message msg = self.sock.recv(4096) # socket disconnected if len(msg) == 0: return None return msg return bytes() def send(self, msg): self.sock.send(msg) class MsgParser: MSGBEGIN = bytes(':', 'utf-8')[0] MSGEND = bytes(';', 'utf-8')[0] MSGSEP = bytes('=', 'utf-8')[0] def __init__(self, conn): self.cmdpos = 0 self.parampos = 0 self.bufferpos = 0 self.reading_cmd = False self.reading_param = False self.buffer = None self.cmd = bytearray(4096) self.param = bytearray(4096) self.conn = conn def readCmd(self, ncmds, timeout=TIMEOUT): ''' returns: - None on error or disconnection - bytes() (empty) on timeout ''' parsed = [] remaining = timeout while remaining > 0 and ncmds > 0: now = time.monotonic() if self.buffer == None: self.buffer = self.conn.recv(remaining) self.bufferpos = 0 # disconnected or error if self.buffer == None: return None for i in range(self.bufferpos, len(self.buffer)): c = self.buffer[i] self.bufferpos += 1 if c == self.MSGBEGIN: self.cmdpos = 0 self.parampos = 0 self.reading_cmd = True self.reading_param = False elif c == self.MSGEND: if not self.reading_cmd: continue self.reading_cmd = False self.reading_param = False cmd = self.cmd[0:self.cmdpos] param = self.param[0:self.parampos] self.reading_cmd = False self.reading_param = False parsed.append((cmd, param)) ncmds -= 1 if ncmds == 0: break elif c == self.MSGSEP: if self.reading_cmd: self.reading_param = True else: if self.reading_param: self.param[self.parampos] = c self.parampos += 1 elif self.reading_cmd: self.cmd[self.cmdpos] = c self.cmdpos += 1 # if we read the entire buffer and didn't finish the command, # throw it away self.buffer = None # check if we have time for another iteration elapsed = time.monotonic() - now remaining = max(0, remaining - elapsed) # timeout return parsed def control(args): if args.socket: address = '\0' + args.socket else: address = DEFAULT_SERVER_ADDRESS conn = Connection(address) msgparser = MsgParser(conn) version = None name = None mesa_version = None msgs = msgparser.readCmd(3) for m in msgs: cmd, param = m if cmd == VERSION_HEADER: version = int(param) elif cmd == DEVICE_NAME_HEADER: name = param.decode('utf-8') elif cmd == MESA_VERSION_HEADER: mesa_version = param.decode('utf-8') if version != 1 or name == None or mesa_version == None: print('ERROR: invalid protocol') sys.exit(1) if args.info: info = "Protocol Version: {}\n" info += "Device Name: {}\n" info += "Mesa Version: {}" print(info.format(version, name, mesa_version)) if args.cmd == 'start-capture': conn.send(bytearray(':capture=1;', 'utf-8')) elif args.cmd == 'stop-capture': conn.send(bytearray(':capture=0;', 'utf-8')) if __name__ == '__main__': parser = argparse.ArgumentParser(description='MESA_overlay control client') parser.add_argument('--info', action='store_true', help='Print info from socket') parser.add_argument('--socket', '-s', type=str, help='Path to socket') commands = parser.add_subparsers(help='commands to run', dest='cmd') commands.add_parser('start-capture') commands.add_parser('stop-capture') args = parser.parse_args() control(args)

./Ninja\.