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128 lines
3.7 KiB
Python
128 lines
3.7 KiB
Python
# Copyright 2024 Google LLC
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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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import collections
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import struct
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from datetime import datetime
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from . import exceptions
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from . import socket
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class PromptProtocol(object):
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PROTOCOL_NUMBER = 0x04
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def __init__(self, connection):
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self.socket = socket.ProtocolSocket(connection, self.PROTOCOL_NUMBER)
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def command_and_response(self, command_string, timeout=1):
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log = []
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cmd = PromptCommand(command_string)
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for _ in xrange(5):
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self.socket.send(cmd.packet)
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try:
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response = PromptResponse.parse(self.socket.receive(timeout=timeout))
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except exceptions.ReceiveQueueEmpty:
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continue
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# Retry the command if we don't get an ACK
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if not response.is_ack_response():
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continue
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# Receive messages until DONE
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is_done = False
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retries = 0
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while not is_done and retries < 3:
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try:
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response = PromptResponse.parse(self.socket.receive(timeout=timeout))
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if response.is_done_response():
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is_done = True
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elif response.is_message_response():
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log.append(response.message)
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retries = 0
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except exceptions.ReceiveQueueEmpty:
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self.socket.send(cmd.packet)
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retries += 1
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if retries == 3:
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raise exceptions.CommandTimedOut('Lost connection while waiting')
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return log
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raise exceptions.CommandTimedOut('Command not acknowledged')
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class PromptResponse(collections.namedtuple('PromptResponse',
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'response_type timestamp message')):
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ACK_RESPONSE = 100
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DONE_RESPONSE = 101
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MESSAGE_RESPONSE = 102
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response_struct = struct.Struct('<BQ')
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def is_ack_response(self):
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return self.response_type == self.ACK_RESPONSE
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def is_done_response(self):
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return self.response_type == self.DONE_RESPONSE
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def is_message_response(self):
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return self.response_type == self.MESSAGE_RESPONSE
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@classmethod
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def parse(cls, response):
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result = cls.response_struct.unpack(response[:cls.response_struct.size])
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response_type = result[0]
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timestamp = datetime.fromtimestamp(result[1] / 1000.0)
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message = response[cls.response_struct.size:]
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return cls(response_type, timestamp, message)
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class PromptCommand(object):
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_cookie = 0
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def __init__(self, body):
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self.body = body
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self.cookie = self._get_cookie()
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@property
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def packet(self):
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return chr(self.cookie) + str(self.body)
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@classmethod
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def _get_cookie(cls):
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cookie = cls._cookie
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cls._cookie = (cls._cookie + 1) % 256
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return cookie
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if __name__ == '__main__':
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import readline
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with socket.Connection.open_dbgserial('ftdi://ftdi:4232:1/3') as connection:
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inputCommand = raw_input('>')
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while inputCommand:
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for message in connection.prompt.command_and_response(inputCommand):
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print message
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inputCommand = raw_input('>')
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