mirror of
https://github.com/thingsboard/thingsboard-gateway
synced 2025-10-26 22:31:42 +08:00
114 lines
4.9 KiB
Python
114 lines
4.9 KiB
Python
# Copyright 2020. ThingsBoard
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# #
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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# #
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# http://www.apache.org/licenses/LICENSE-2.0
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# #
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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from os import getcwd, chdir
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from subprocess import Popen, PIPE, STDOUT, TimeoutExpired
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from logging import getLogger
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log = getLogger("service")
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class RemoteShell:
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def __init__(self, platform, release):
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self.__session_active = False
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self.__platform = platform
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self.__release = release
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self.shell_commands = {
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"getTermInfo": self.get_term_info,
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"sendCommand": self.send_command,
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"getCommandStatus": self.get_command_status,
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"terminateCommand": self.terminate_command,
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}
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self.command_in_progress = None
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self.__previous_stdout = b""
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self.__previous_stderr = b""
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def get_term_info(self, *args):
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return {"platform": self.__platform, "release": self.__release, "cwd": str(getcwd())}
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def send_command(self, *args):
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result = {"ok": False, "qos": 0}
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log.debug("Received command to shell with args: %r", args)
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command = args[0]['command']
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cwd = args[0].get('cwd')
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if cwd is not None and str(getcwd()) != cwd:
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chdir(cwd)
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if command.split():
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if self.command_in_progress is not None:
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log.debug("Received a new command: \"%s\", during old command is running, terminating old command...", command)
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old_command = self.command_in_progress.args
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self.terminate_command()
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log.debug("Old command: \"%s\" terminated.", old_command)
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if command.split()[0] in ["quit", "exit"]:
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self.command_in_progress = None
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elif command.split()[0] == "cd":
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chdir(command.split()[1])
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self.command_in_progress = "cd"
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else:
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log.debug("Run command in remote shell: %s", command)
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self.command_in_progress = Popen(command, shell=True, stdout=PIPE, stdin=PIPE, stderr=STDOUT, universal_newlines=True)
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result.update({"ok": True})
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return result
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def get_command_status(self, *args):
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result = {"data": [{"stdout": "",
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"stderr": ""}],
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"cwd": str(getcwd()),
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"done": True,
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"qos": 0,
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}
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done = False
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if self.command_in_progress == "cd":
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done = True
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elif self.command_in_progress is not None:
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stdout_value = b""
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stderr_value = b""
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done = True if self.command_in_progress.poll() is not None else False
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try:
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stdout_value, stderr_value = self.command_in_progress.communicate(timeout=.1)
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except TimeoutExpired as e:
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log.debug("Process is run")
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stdout_value = b"" if e.stdout is None else e.stdout.replace(self.__previous_stdout, b"")
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stderr_value = b"" if e.stderr is None else e.stderr.replace(self.__previous_stderr, b"")
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stdout_value = stdout_value[:-1] if len(stdout_value) and stdout_value[-1] == b"\n" else stdout_value
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stderr_value = stderr_value[:-1] if len(stderr_value) and stderr_value[-1] == b"\n" else stderr_value
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self.__previous_stderr = self.__previous_stderr + b"" if stderr_value is None else stderr_value
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self.__previous_stdout = self.__previous_stdout + b"" if stdout_value is None else stdout_value
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str_stdout = str(stdout_value, "UTF-8") if isinstance(stdout_value, bytes) else stdout_value
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str_stderr = str(stderr_value, "UTF-8") if isinstance(stderr_value, bytes) else stderr_value
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result.update({"data": [{"stdout": str_stdout,
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"stderr": str_stderr}]
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})
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result.update({"done": done})
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if done:
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self.command_in_progress = None
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return result
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def terminate_command(self, *args):
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result = {"ok": False}
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if self.command_in_progress is not None:
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try:
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self.command_in_progress.terminate()
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self.__previous_stderr = b""
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self.__previous_stdout = b""
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result.update({"ok": True})
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except Exception as e:
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log.exception(e)
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result["error"] = str(e)
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else:
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result["error"] = "Process for termination not found."
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return result
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