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import pty
import termios
import os
import fcntl
import struct
import resource
import signal
import sys
import time
BUFSIZ = 2048
class TerminalRecorder(object):
def __init__(self, command, filename, id_header, logger, io_loop, termsize):
self.io_loop = io_loop
self.command = command
if filename:
self.ttyrec = open(filename, "w", 0)
else:
self.ttyrec = None
self.id = id
self.returncode = None
self.output_buffer = ""
self.termsize = termsize
self.pid = None
self.child_fd = None
self.end_callback = None
self.output_callback = None
self.activity_callback = None
self.error_callback = None
self.errpipe_read = None
self.error_buffer = ""
self.logger = logger
if id_header:
self.write_ttyrec_chunk(id_header)
self._spawn()
def _spawn(self):
self.errpipe_read, errpipe_write = os.pipe()
self.pid, self.child_fd = pty.fork()
if self.pid == 0:
# We're the child
def handle_signal(signal, f):
sys.exit(0)
signal.signal(1, handle_signal)
# Set window size
cols, lines = self.get_terminal_size()
s = struct.pack("HHHH", lines, cols, 0, 0)
fcntl.ioctl(sys.stdout.fileno(), termios.TIOCSWINSZ, s)
os.close(self.errpipe_read)
os.dup2(errpipe_write, 2)
# Make sure not to retain any files from the parent
max_fd = resource.getrlimit(resource.RLIMIT_NOFILE)[0]
for i in range(3, max_fd):
try:
os.close(i)
except OSError:
pass
# And exec
env = dict(os.environ)
env["COLUMNS"] = str(cols)
env["LINES"] = str(lines)
env["TERM"] = "linux"
try:
os.execvpe(self.command[0], self.command, env)
except OSError:
sys.exit(1)
# We're the parent
os.close(errpipe_write)
self.io_loop.add_handler(self.child_fd,
self._handle_read,
self.io_loop.ERROR | self.io_loop.READ)
self.io_loop.add_handler(self.errpipe_read,
self._handle_err_read,
self.io_loop.READ)
def _handle_read(self, fd, events):
if events & self.io_loop.READ:
buf = os.read(fd, BUFSIZ)
if len(buf) > 0:
self.write_ttyrec_chunk(buf)
if self.activity_callback:
self.activity_callback()
self.output_buffer += buf
self._do_output_callback()
self.poll()
if events & self.io_loop.ERROR:
self.poll()
def _handle_err_read(self, fd, events):
if events & self.io_loop.READ:
buf = os.read(fd, BUFSIZ)
if len(buf) > 0:
self.error_buffer += buf
self._log_error_output()
self.poll()
def write_ttyrec_header(self, sec, usec, l):
if self.ttyrec is None: return
s = struct.pack("<iii", sec, usec, l)
self.ttyrec.write(s)
def write_ttyrec_chunk(self, data):
if self.ttyrec is None: return
t = time.time()
self.write_ttyrec_header(int(t), int((t % 1) * 1000000), len(data))
self.ttyrec.write(data)
def _do_output_callback(self):
pos = self.output_buffer.find("\n")
while pos >= 0:
line = self.output_buffer[:pos]
self.output_buffer = self.output_buffer[pos + 1:]
if len(line) > 0:
if line[-1] == "\r": line = line[:-1]
if self.output_callback:
self.output_callback(line)
pos = self.output_buffer.find("\n")
def _log_error_output(self):
pos = self.error_buffer.find("\n")
while pos >= 0:
line = self.error_buffer[:pos]
self.error_buffer = self.error_buffer[pos + 1:]
if len(line) > 0:
if line[-1] == "\r": line = line[:-1]
self.logger.info("ERR: %s", line)
if self.error_callback:
self.error_callback(line)
pos = self.error_buffer.find("\n")
def send_signal(self, signal):
os.kill(self.pid, signal)
def poll(self):
if self.returncode is None:
pid, status = os.waitpid(self.pid, os.WNOHANG)
if pid == self.pid:
if os.WIFSIGNALED(status):
self.returncode = -os.WTERMSIG(status)
elif os.WIFEXITED(status):
self.returncode = os.WEXITSTATUS(status)
else:
# Should never happen
raise RuntimeError("Unknown child exit status!")
if self.returncode is not None:
self.io_loop.remove_handler(self.child_fd)
self.io_loop.remove_handler(self.errpipe_read)
os.close(self.child_fd)
os.close(self.errpipe_read)
if self.ttyrec:
self.ttyrec.close()
if self.end_callback:
self.end_callback()
return self.returncode
def get_terminal_size(self):
return self.termsize
def write_input(self, data):
if self.poll() is not None: return
while len(data) > 0:
written = os.write(self.child_fd, data)
data = data[written:]
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