import os
import shlex
import subprocess
import logging
class ShellCommand:
def __init__(self, config):
self.name = config.get_name().split()[-1]
self.printer = config.get_printer()
self.gcode = self.printer.lookup_object("gcode")
cmd = config.get("command")
cmd = os.path.expanduser(cmd)
self.command = shlex.split(cmd)
self.timeout = config.getfloat("timeout", 2.0, above=0.0)
self.verbose = config.getboolean("verbose", True)
self.proc_fd = None
self.partial_output = ""
self.gcode.register_mux_command(
"RUN_SHELL_COMMAND",
"CMD",
self.name,
self.cmd_RUN_SHELL_COMMAND,
desc=self.cmd_RUN_SHELL_COMMAND_help,
)
def _process_output(self, eventime):
if self.proc_fd is None:
return
try:
data = os.read(self.proc_fd, 4096)
except Exception:
pass
data = self.partial_output + data.decode()
if "\n" not in data:
self.partial_output = data
return
elif data[-1] != "\n":
split = data.rfind("\n") + 1
self.partial_output = data[split:]
data = data[:split]
else:
self.partial_output = ""
self.gcode.respond_info(data)
cmd_RUN_SHELL_COMMAND_help = "Run a linux shell command"
def cmd_RUN_SHELL_COMMAND(self, params):
gcode_params = params.get("PARAMS", "")
gcode_params = shlex.split(gcode_params)
reactor = self.printer.get_reactor()
try:
proc = subprocess.Popen(
self.command + gcode_params,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
)
except Exception:
logging.exception("shell_command: Command {%s} failed" % (self.name))
raise self.gcode.error("Error running command {%s}" % (self.name))
if self.verbose:
self.proc_fd = proc.stdout.fileno()
self.gcode.respond_info("Running Command {%s}...:" % (self.name))
hdl = reactor.register_fd(self.proc_fd, self._process_output)
eventtime = reactor.monotonic()
endtime = eventtime + self.timeout
complete = False
while eventtime < endtime:
eventtime = reactor.pause(eventtime + 0.05)
if proc.poll() is not None:
complete = True
break
if not complete:
proc.terminate()
if self.verbose:
if self.partial_output:
self.gcode.respond_info(self.partial_output)
self.partial_output = ""
if complete:
msg = "Command {%s} finished\n" % (self.name)
else:
msg = "Command {%s} timed out" % (self.name)
self.gcode.respond_info(msg)
reactor.unregister_fd(hdl)
self.proc_fd = None
def load_config_prefix(config):
return ShellCommand(config)