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Diffstat (limited to 'util/ec3po/interpreter.py')
| -rw-r--r-- | util/ec3po/interpreter.py | 830 |
1 files changed, 422 insertions, 408 deletions
diff --git a/util/ec3po/interpreter.py b/util/ec3po/interpreter.py index 4e151083bd..8d21af247a 100644 --- a/util/ec3po/interpreter.py +++ b/util/ec3po/interpreter.py @@ -1,4 +1,4 @@ -# Copyright 2015 The Chromium OS Authors. All rights reserved. +# Copyright 2015 The ChromiumOS Authors # Use of this source code is governed by a BSD-style license that can be # found in the LICENSE file. @@ -25,443 +25,457 @@ import traceback import six - COMMAND_RETRIES = 3 # Number of attempts to retry a command. EC_MAX_READ = 1024 # Max bytes to read at a time from the EC. -EC_SYN = b'\xec' # Byte indicating EC interrogation. -EC_ACK = b'\xc0' # Byte representing correct EC response to interrogation. +EC_SYN = b"\xec" # Byte indicating EC interrogation. +EC_ACK = b"\xc0" # Byte representing correct EC response to interrogation. class LoggerAdapter(logging.LoggerAdapter): - """Class which provides a small adapter for the logger.""" + """Class which provides a small adapter for the logger.""" - def process(self, msg, kwargs): - """Prepends the served PTY to the beginning of the log message.""" - return '%s - %s' % (self.extra['pty'], msg), kwargs + def process(self, msg, kwargs): + """Prepends the served PTY to the beginning of the log message.""" + return "%s - %s" % (self.extra["pty"], msg), kwargs class Interpreter(object): - """Class which provides the interpretation layer between the EC and user. - - This class essentially performs all of the intepretation for the EC and the - user. It handles all of the automatic command retrying as well as the - formation of commands for EC images which support that. - - Attributes: - logger: A logger for this module. - ec_uart_pty: An opened file object to the raw EC UART PTY. - ec_uart_pty_name: A string containing the name of the raw EC UART PTY. - cmd_pipe: A socket.socket or multiprocessing.Connection object which - represents the Interpreter side of the command pipe. This must be a - bidirectional pipe. Commands and responses will utilize this pipe. - dbg_pipe: A socket.socket or multiprocessing.Connection object which - represents the Interpreter side of the debug pipe. This must be a - unidirectional pipe with write capabilities. EC debug output will utilize - this pipe. - cmd_retries: An integer representing the number of attempts the console - should retry commands if it receives an error. - log_level: An integer representing the numeric value of the log level. - inputs: A list of objects that the intpreter selects for reading. - Initially, these are the EC UART and the command pipe. - outputs: A list of objects that the interpreter selects for writing. - ec_cmd_queue: A FIFO queue used for sending commands down to the EC UART. - last_cmd: A string that represents the last command sent to the EC. If an - error is encountered, the interpreter will attempt to retry this command - up to COMMAND_RETRIES. - enhanced_ec: A boolean indicating if the EC image that we are currently - communicating with is enhanced or not. Enhanced EC images will support - packed commands and host commands over the UART. This defaults to False - and is changed depending on the result of an interrogation. - interrogating: A boolean indicating if we are in the middle of interrogating - the EC. - connected: A boolean indicating if the interpreter is actually connected to - the UART and listening. - """ - def __init__(self, ec_uart_pty, cmd_pipe, dbg_pipe, log_level=logging.INFO, - name=None): - """Intializes an Interpreter object with the provided args. + """Class which provides the interpretation layer between the EC and user. - Args: - ec_uart_pty: A string representing the EC UART to connect to. + This class essentially performs all of the intepretation for the EC and the + user. It handles all of the automatic command retrying as well as the + formation of commands for EC images which support that. + + Attributes: + logger: A logger for this module. + ec_uart_pty: An opened file object to the raw EC UART PTY. + ec_uart_pty_name: A string containing the name of the raw EC UART PTY. cmd_pipe: A socket.socket or multiprocessing.Connection object which represents the Interpreter side of the command pipe. This must be a bidirectional pipe. Commands and responses will utilize this pipe. dbg_pipe: A socket.socket or multiprocessing.Connection object which represents the Interpreter side of the debug pipe. This must be a - unidirectional pipe with write capabilities. EC debug output will - utilize this pipe. + unidirectional pipe with write capabilities. EC debug output will utilize + this pipe. cmd_retries: An integer representing the number of attempts the console should retry commands if it receives an error. - log_level: An optional integer representing the numeric value of the log - level. By default, the log level will be logging.INFO (20). - name: the console source name - """ - # Create a unique logger based on the interpreter name - interpreter_prefix = ('%s - ' % name) if name else '' - logger = logging.getLogger('%sEC3PO.Interpreter' % interpreter_prefix) - self.logger = LoggerAdapter(logger, {'pty': ec_uart_pty}) - # TODO(https://crbug.com/1162189): revist the 2 TODOs below - # TODO(https://bugs.python.org/issue27805, python3.7+): revert to ab+ - # TODO(https://bugs.python.org/issue20074): removing buffering=0 if/when - # that gets fixed, or keep two pty: one for reading and one for writing - self.ec_uart_pty = open(ec_uart_pty, 'r+b', buffering=0) - self.ec_uart_pty_name = ec_uart_pty - self.cmd_pipe = cmd_pipe - self.dbg_pipe = dbg_pipe - self.cmd_retries = COMMAND_RETRIES - self.log_level = log_level - self.inputs = [self.ec_uart_pty, self.cmd_pipe] - self.outputs = [] - self.ec_cmd_queue = six.moves.queue.Queue() - self.last_cmd = b'' - self.enhanced_ec = False - self.interrogating = False - self.connected = True - - def __str__(self): - """Show internal state of the Interpreter object. - - Returns: - A string that shows the values of the attributes. - """ - string = [] - string.append('%r' % self) - string.append('ec_uart_pty: %s' % self.ec_uart_pty) - string.append('cmd_pipe: %r' % self.cmd_pipe) - string.append('dbg_pipe: %r' % self.dbg_pipe) - string.append('cmd_retries: %d' % self.cmd_retries) - string.append('log_level: %d' % self.log_level) - string.append('inputs: %r' % self.inputs) - string.append('outputs: %r' % self.outputs) - string.append('ec_cmd_queue: %r' % self.ec_cmd_queue) - string.append('last_cmd: \'%s\'' % self.last_cmd) - string.append('enhanced_ec: %r' % self.enhanced_ec) - string.append('interrogating: %r' % self.interrogating) - return '\n'.join(string) - - def EnqueueCmd(self, command): - """Enqueue a command to be sent to the EC UART. - - Args: - command: A string which contains the command to be sent. + log_level: An integer representing the numeric value of the log level. + inputs: A list of objects that the intpreter selects for reading. + Initially, these are the EC UART and the command pipe. + outputs: A list of objects that the interpreter selects for writing. + ec_cmd_queue: A FIFO queue used for sending commands down to the EC UART. + last_cmd: A string that represents the last command sent to the EC. If an + error is encountered, the interpreter will attempt to retry this command + up to COMMAND_RETRIES. + enhanced_ec: A boolean indicating if the EC image that we are currently + communicating with is enhanced or not. Enhanced EC images will support + packed commands and host commands over the UART. This defaults to False + and is changed depending on the result of an interrogation. + interrogating: A boolean indicating if we are in the middle of interrogating + the EC. + connected: A boolean indicating if the interpreter is actually connected to + the UART and listening. """ - self.ec_cmd_queue.put(command) - self.logger.log(1, 'Commands now in queue: %d', self.ec_cmd_queue.qsize()) - # Add the EC UART as an output to be serviced. - if self.connected and self.ec_uart_pty not in self.outputs: - self.outputs.append(self.ec_uart_pty) - - def PackCommand(self, raw_cmd): - r"""Packs a command for use with error checking. - - For error checking, we pack console commands in a particular format. The - format is as follows: - - &&[x][x][x][x]&{cmd}\n\n - ^ ^ ^^ ^^ ^ ^-- 2 newlines. - | | || || |-- the raw console command. - | | || ||-- 1 ampersand. - | | ||____|--- 2 hex digits representing the CRC8 of cmd. - | |____|-- 2 hex digits reprsenting the length of cmd. - |-- 2 ampersands - - Args: - raw_cmd: A pre-packed string which contains the raw command. - - Returns: - A string which contains the packed command. - """ - # Don't pack a single carriage return. - if raw_cmd != b'\r': - # The command format is as follows. - # &&[x][x][x][x]&{cmd}\n\n - packed_cmd = [] - packed_cmd.append(b'&&') - # The first pair of hex digits are the length of the command. - packed_cmd.append(b'%02x' % len(raw_cmd)) - # Then the CRC8 of cmd. - packed_cmd.append(b'%02x' % Crc8(raw_cmd)) - packed_cmd.append(b'&') - # Now, the raw command followed by 2 newlines. - packed_cmd.append(raw_cmd) - packed_cmd.append(b'\n\n') - return b''.join(packed_cmd) - else: - return raw_cmd - - def ProcessCommand(self, command): - """Captures the input determines what actions to take. - - Args: - command: A string representing the command sent by the user. - """ - if command == b'disconnect': - if self.connected: - self.logger.debug('UART disconnect request.') - # Drop all pending commands if any. - while not self.ec_cmd_queue.empty(): - c = self.ec_cmd_queue.get() - self.logger.debug('dropped: \'%s\'', c) - if self.enhanced_ec: - # Reset retry state. - self.cmd_retries = COMMAND_RETRIES - self.last_cmd = b'' - # Get the UART that the interpreter is attached to. - fileobj = self.ec_uart_pty - self.logger.debug('fileobj: %r', fileobj) - # Remove the descriptor from the inputs and outputs. - self.inputs.remove(fileobj) - if fileobj in self.outputs: - self.outputs.remove(fileobj) - self.logger.debug('Removed fileobj. Remaining inputs: %r', self.inputs) - # Close the file. - fileobj.close() - # Mark the interpreter as disconnected now. - self.connected = False - self.logger.debug('Disconnected from %s.', self.ec_uart_pty_name) - return - - elif command == b'reconnect': - if not self.connected: - self.logger.debug('UART reconnect request.') - # Reopen the PTY. + def __init__( + self, ec_uart_pty, cmd_pipe, dbg_pipe, log_level=logging.INFO, name=None + ): + """Intializes an Interpreter object with the provided args. + + Args: + ec_uart_pty: A string representing the EC UART to connect to. + cmd_pipe: A socket.socket or multiprocessing.Connection object which + represents the Interpreter side of the command pipe. This must be a + bidirectional pipe. Commands and responses will utilize this pipe. + dbg_pipe: A socket.socket or multiprocessing.Connection object which + represents the Interpreter side of the debug pipe. This must be a + unidirectional pipe with write capabilities. EC debug output will + utilize this pipe. + cmd_retries: An integer representing the number of attempts the console + should retry commands if it receives an error. + log_level: An optional integer representing the numeric value of the log + level. By default, the log level will be logging.INFO (20). + name: the console source name + """ + # Create a unique logger based on the interpreter name + interpreter_prefix = ("%s - " % name) if name else "" + logger = logging.getLogger("%sEC3PO.Interpreter" % interpreter_prefix) + self.logger = LoggerAdapter(logger, {"pty": ec_uart_pty}) + # TODO(https://crbug.com/1162189): revist the 2 TODOs below # TODO(https://bugs.python.org/issue27805, python3.7+): revert to ab+ # TODO(https://bugs.python.org/issue20074): removing buffering=0 if/when # that gets fixed, or keep two pty: one for reading and one for writing - fileobj = open(self.ec_uart_pty_name, 'r+b', buffering=0) - self.logger.debug('fileobj: %r', fileobj) - self.ec_uart_pty = fileobj - # Add the descriptor to the inputs. - self.inputs.append(fileobj) - self.logger.debug('fileobj added. curr inputs: %r', self.inputs) - # Mark the interpreter as connected now. - self.connected = True - self.logger.debug('Connected to %s.', self.ec_uart_pty_name) - return - - elif command.startswith(b'enhanced'): - self.enhanced_ec = command.split(b' ')[1] == b'True' - return - - # Ignore any other commands while in the disconnected state. - self.logger.log(1, 'command: \'%s\'', command) - if not self.connected: - self.logger.debug('Ignoring command because currently disconnected.') - return - - # Remove leading and trailing spaces only if this is an enhanced EC image. - # For non-enhanced EC images, commands will be single characters at a time - # and can be spaces. - if self.enhanced_ec: - command = command.strip(b' ') - - # There's nothing to do if the command is empty. - if len(command) == 0: - return - - # Handle log level change requests. - if command.startswith(b'loglevel'): - self.logger.debug('Log level change request.') - new_log_level = int(command.split(b' ')[1]) - self.logger.logger.setLevel(new_log_level) - self.logger.info('Log level changed to %d.', new_log_level) - return - - # Check for interrogation command. - if command == EC_SYN: - # User is requesting interrogation. Send SYN as is. - self.logger.debug('User requesting interrogation.') - self.interrogating = True - # Assume the EC isn't enhanced until we get a response. - self.enhanced_ec = False - elif self.enhanced_ec: - # Enhanced EC images require the plaintext commands to be packed. - command = self.PackCommand(command) - # TODO(aaboagye): Make a dict of commands and keys and eventually, - # handle partial matching based on unique prefixes. - - self.EnqueueCmd(command) - - def HandleCmdRetries(self): - """Attempts to retry commands if possible.""" - if self.cmd_retries > 0: - # The EC encountered an error. We'll have to retry again. - self.logger.warning('Retrying command...') - self.cmd_retries -= 1 - self.logger.warning('Retries remaining: %d', self.cmd_retries) - # Retry the command and add the EC UART to the writers again. - self.EnqueueCmd(self.last_cmd) - self.outputs.append(self.ec_uart_pty) - else: - # We're out of retries, so just give up. - self.logger.error('Command failed. No retries left.') - # Clear the command in progress. - self.last_cmd = b'' - # Reset the retry count. - self.cmd_retries = COMMAND_RETRIES - - def SendCmdToEC(self): - """Sends a command to the EC.""" - # If we're retrying a command, just try to send it again. - if self.cmd_retries < COMMAND_RETRIES: - cmd = self.last_cmd - else: - # If we're not retrying, we should not be writing to the EC if we have no - # items in our command queue. - assert not self.ec_cmd_queue.empty() - # Get the command to send. - cmd = self.ec_cmd_queue.get() - - # Send the command. - self.ec_uart_pty.write(cmd) - self.ec_uart_pty.flush() - self.logger.log(1, 'Sent command to EC.') - - if self.enhanced_ec and cmd != EC_SYN: - # Now, that we've sent the command, store the current command as the last - # command sent. If we encounter an error string, we will attempt to retry - # this command. - if cmd != self.last_cmd: - self.last_cmd = cmd - # Reset the retry count. + self.ec_uart_pty = open(ec_uart_pty, "r+b", buffering=0) + self.ec_uart_pty_name = ec_uart_pty + self.cmd_pipe = cmd_pipe + self.dbg_pipe = dbg_pipe self.cmd_retries = COMMAND_RETRIES + self.log_level = log_level + self.inputs = [self.ec_uart_pty, self.cmd_pipe] + self.outputs = [] + self.ec_cmd_queue = six.moves.queue.Queue() + self.last_cmd = b"" + self.enhanced_ec = False + self.interrogating = False + self.connected = True - # If no command is pending to be sent, then we can remove the EC UART from - # writers. Might need better checking for command retry logic in here. - if self.ec_cmd_queue.empty(): - # Remove the EC UART from the writers while we wait for a response. - self.logger.debug('Removing EC UART from writers.') - self.outputs.remove(self.ec_uart_pty) - - def HandleECData(self): - """Handle any debug prints from the EC.""" - self.logger.log(1, 'EC has data') - # Read what the EC sent us. - data = os.read(self.ec_uart_pty.fileno(), EC_MAX_READ) - self.logger.log(1, 'got: \'%s\'', binascii.hexlify(data)) - if b'&E' in data and self.enhanced_ec: - # We received an error, so we should retry it if possible. - self.logger.warning('Error string found in data.') - self.HandleCmdRetries() - return - - # If we were interrogating, check the response and update our knowledge - # of the current EC image. - if self.interrogating: - self.enhanced_ec = data == EC_ACK - if self.enhanced_ec: - self.logger.debug('The current EC image seems enhanced.') - else: - self.logger.debug('The current EC image does NOT seem enhanced.') - # Done interrogating. - self.interrogating = False - # For now, just forward everything the EC sends us. - self.logger.log(1, 'Forwarding to user...') - self.dbg_pipe.send(data) - - def HandleUserData(self): - """Handle any incoming commands from the user. - - Raises: - EOFError: Allowed to propagate through from self.cmd_pipe.recv(). - """ - self.logger.log(1, 'Command data available. Begin processing.') - data = self.cmd_pipe.recv() - # Process the command. - self.ProcessCommand(data) + def __str__(self): + """Show internal state of the Interpreter object. + + Returns: + A string that shows the values of the attributes. + """ + string = [] + string.append("%r" % self) + string.append("ec_uart_pty: %s" % self.ec_uart_pty) + string.append("cmd_pipe: %r" % self.cmd_pipe) + string.append("dbg_pipe: %r" % self.dbg_pipe) + string.append("cmd_retries: %d" % self.cmd_retries) + string.append("log_level: %d" % self.log_level) + string.append("inputs: %r" % self.inputs) + string.append("outputs: %r" % self.outputs) + string.append("ec_cmd_queue: %r" % self.ec_cmd_queue) + string.append("last_cmd: '%s'" % self.last_cmd) + string.append("enhanced_ec: %r" % self.enhanced_ec) + string.append("interrogating: %r" % self.interrogating) + return "\n".join(string) + + def EnqueueCmd(self, command): + """Enqueue a command to be sent to the EC UART. + + Args: + command: A string which contains the command to be sent. + """ + self.ec_cmd_queue.put(command) + self.logger.log( + 1, "Commands now in queue: %d", self.ec_cmd_queue.qsize() + ) + + # Add the EC UART as an output to be serviced. + if self.connected and self.ec_uart_pty not in self.outputs: + self.outputs.append(self.ec_uart_pty) + + def PackCommand(self, raw_cmd): + r"""Packs a command for use with error checking. + + For error checking, we pack console commands in a particular format. The + format is as follows: + + &&[x][x][x][x]&{cmd}\n\n + ^ ^ ^^ ^^ ^ ^-- 2 newlines. + | | || || |-- the raw console command. + | | || ||-- 1 ampersand. + | | ||____|--- 2 hex digits representing the CRC8 of cmd. + | |____|-- 2 hex digits reprsenting the length of cmd. + |-- 2 ampersands + + Args: + raw_cmd: A pre-packed string which contains the raw command. + + Returns: + A string which contains the packed command. + """ + # Don't pack a single carriage return. + if raw_cmd != b"\r": + # The command format is as follows. + # &&[x][x][x][x]&{cmd}\n\n + packed_cmd = [] + packed_cmd.append(b"&&") + # The first pair of hex digits are the length of the command. + packed_cmd.append(b"%02x" % len(raw_cmd)) + # Then the CRC8 of cmd. + packed_cmd.append(b"%02x" % Crc8(raw_cmd)) + packed_cmd.append(b"&") + # Now, the raw command followed by 2 newlines. + packed_cmd.append(raw_cmd) + packed_cmd.append(b"\n\n") + return b"".join(packed_cmd) + else: + return raw_cmd + + def ProcessCommand(self, command): + """Captures the input determines what actions to take. + + Args: + command: A string representing the command sent by the user. + """ + if command == b"disconnect": + if self.connected: + self.logger.debug("UART disconnect request.") + # Drop all pending commands if any. + while not self.ec_cmd_queue.empty(): + c = self.ec_cmd_queue.get() + self.logger.debug("dropped: '%s'", c) + if self.enhanced_ec: + # Reset retry state. + self.cmd_retries = COMMAND_RETRIES + self.last_cmd = b"" + # Get the UART that the interpreter is attached to. + fileobj = self.ec_uart_pty + self.logger.debug("fileobj: %r", fileobj) + # Remove the descriptor from the inputs and outputs. + self.inputs.remove(fileobj) + if fileobj in self.outputs: + self.outputs.remove(fileobj) + self.logger.debug( + "Removed fileobj. Remaining inputs: %r", self.inputs + ) + # Close the file. + fileobj.close() + # Mark the interpreter as disconnected now. + self.connected = False + self.logger.debug( + "Disconnected from %s.", self.ec_uart_pty_name + ) + return + + elif command == b"reconnect": + if not self.connected: + self.logger.debug("UART reconnect request.") + # Reopen the PTY. + # TODO(https://bugs.python.org/issue27805, python3.7+): revert to ab+ + # TODO(https://bugs.python.org/issue20074): removing buffering=0 if/when + # that gets fixed, or keep two pty: one for reading and one for writing + fileobj = open(self.ec_uart_pty_name, "r+b", buffering=0) + self.logger.debug("fileobj: %r", fileobj) + self.ec_uart_pty = fileobj + # Add the descriptor to the inputs. + self.inputs.append(fileobj) + self.logger.debug("fileobj added. curr inputs: %r", self.inputs) + # Mark the interpreter as connected now. + self.connected = True + self.logger.debug("Connected to %s.", self.ec_uart_pty_name) + return + + elif command.startswith(b"enhanced"): + self.enhanced_ec = command.split(b" ")[1] == b"True" + return + + # Ignore any other commands while in the disconnected state. + self.logger.log(1, "command: '%s'", command) + if not self.connected: + self.logger.debug( + "Ignoring command because currently disconnected." + ) + return + + # Remove leading and trailing spaces only if this is an enhanced EC image. + # For non-enhanced EC images, commands will be single characters at a time + # and can be spaces. + if self.enhanced_ec: + command = command.strip(b" ") + + # There's nothing to do if the command is empty. + if len(command) == 0: + return + + # Handle log level change requests. + if command.startswith(b"loglevel"): + self.logger.debug("Log level change request.") + new_log_level = int(command.split(b" ")[1]) + self.logger.logger.setLevel(new_log_level) + self.logger.info("Log level changed to %d.", new_log_level) + return + + # Check for interrogation command. + if command == EC_SYN: + # User is requesting interrogation. Send SYN as is. + self.logger.debug("User requesting interrogation.") + self.interrogating = True + # Assume the EC isn't enhanced until we get a response. + self.enhanced_ec = False + elif self.enhanced_ec: + # Enhanced EC images require the plaintext commands to be packed. + command = self.PackCommand(command) + # TODO(aaboagye): Make a dict of commands and keys and eventually, + # handle partial matching based on unique prefixes. + + self.EnqueueCmd(command) + + def HandleCmdRetries(self): + """Attempts to retry commands if possible.""" + if self.cmd_retries > 0: + # The EC encountered an error. We'll have to retry again. + self.logger.warning("Retrying command...") + self.cmd_retries -= 1 + self.logger.warning("Retries remaining: %d", self.cmd_retries) + # Retry the command and add the EC UART to the writers again. + self.EnqueueCmd(self.last_cmd) + self.outputs.append(self.ec_uart_pty) + else: + # We're out of retries, so just give up. + self.logger.error("Command failed. No retries left.") + # Clear the command in progress. + self.last_cmd = b"" + # Reset the retry count. + self.cmd_retries = COMMAND_RETRIES + + def SendCmdToEC(self): + """Sends a command to the EC.""" + # If we're retrying a command, just try to send it again. + if self.cmd_retries < COMMAND_RETRIES: + cmd = self.last_cmd + else: + # If we're not retrying, we should not be writing to the EC if we have no + # items in our command queue. + assert not self.ec_cmd_queue.empty() + # Get the command to send. + cmd = self.ec_cmd_queue.get() + + # Send the command. + self.ec_uart_pty.write(cmd) + self.ec_uart_pty.flush() + self.logger.log(1, "Sent command to EC.") + + if self.enhanced_ec and cmd != EC_SYN: + # Now, that we've sent the command, store the current command as the last + # command sent. If we encounter an error string, we will attempt to retry + # this command. + if cmd != self.last_cmd: + self.last_cmd = cmd + # Reset the retry count. + self.cmd_retries = COMMAND_RETRIES + + # If no command is pending to be sent, then we can remove the EC UART from + # writers. Might need better checking for command retry logic in here. + if self.ec_cmd_queue.empty(): + # Remove the EC UART from the writers while we wait for a response. + self.logger.debug("Removing EC UART from writers.") + self.outputs.remove(self.ec_uart_pty) + + def HandleECData(self): + """Handle any debug prints from the EC.""" + self.logger.log(1, "EC has data") + # Read what the EC sent us. + data = os.read(self.ec_uart_pty.fileno(), EC_MAX_READ) + self.logger.log(1, "got: '%s'", binascii.hexlify(data)) + if b"&E" in data and self.enhanced_ec: + # We received an error, so we should retry it if possible. + self.logger.warning("Error string found in data.") + self.HandleCmdRetries() + return + + # If we were interrogating, check the response and update our knowledge + # of the current EC image. + if self.interrogating: + self.enhanced_ec = data == EC_ACK + if self.enhanced_ec: + self.logger.debug("The current EC image seems enhanced.") + else: + self.logger.debug( + "The current EC image does NOT seem enhanced." + ) + # Done interrogating. + self.interrogating = False + # For now, just forward everything the EC sends us. + self.logger.log(1, "Forwarding to user...") + self.dbg_pipe.send(data) + + def HandleUserData(self): + """Handle any incoming commands from the user. + + Raises: + EOFError: Allowed to propagate through from self.cmd_pipe.recv(). + """ + self.logger.log(1, "Command data available. Begin processing.") + data = self.cmd_pipe.recv() + # Process the command. + self.ProcessCommand(data) def Crc8(data): - """Calculates the CRC8 of data. + """Calculates the CRC8 of data. - The generator polynomial used is: x^8 + x^2 + x + 1. - This is the same implementation that is used in the EC. + The generator polynomial used is: x^8 + x^2 + x + 1. + This is the same implementation that is used in the EC. - Args: - data: A string of data that we wish to calculate the CRC8 on. + Args: + data: A string of data that we wish to calculate the CRC8 on. - Returns: - crc >> 8: An integer representing the CRC8 value. - """ - crc = 0 - for byte in six.iterbytes(data): - crc ^= (byte << 8) - for _ in range(8): - if crc & 0x8000: - crc ^= (0x1070 << 3) - crc <<= 1 - return crc >> 8 + Returns: + crc >> 8: An integer representing the CRC8 value. + """ + crc = 0 + for byte in six.iterbytes(data): + crc ^= byte << 8 + for _ in range(8): + if crc & 0x8000: + crc ^= 0x1070 << 3 + crc <<= 1 + return crc >> 8 def StartLoop(interp, shutdown_pipe=None): - """Starts an infinite loop of servicing the user and the EC. - - StartLoop checks to see if there are any commands to process, processing them - if any, and forwards EC output to the user. - - When sending a command to the EC, we send the command once and check the - response to see if the EC encountered an error when receiving the command. An - error condition is reported to the interpreter by a string with at least one - '&' and 'E'. The full string is actually '&&EE', however it's possible that - the leading ampersand or trailing 'E' could be dropped. If an error is - encountered, the interpreter will retry up to the amount configured. - - Args: - interp: An Interpreter object that has been properly initialised. - shutdown_pipe: A file object for a pipe or equivalent that becomes readable - (not blocked) to indicate that the loop should exit. Can be None to never - exit the loop. - """ - try: - # This is used instead of "break" to avoid exiting the loop in the middle of - # an iteration. - continue_looping = True - - while continue_looping: - # The inputs list is created anew in each loop iteration because the - # Interpreter class sometimes modifies the interp.inputs list. - if shutdown_pipe is None: - inputs = interp.inputs - else: - inputs = list(interp.inputs) - inputs.append(shutdown_pipe) - - readable, writeable, _ = select.select(inputs, interp.outputs, []) - - for obj in readable: - # Handle any debug prints from the EC. - if obj is interp.ec_uart_pty: - interp.HandleECData() - - # Handle any commands from the user. - elif obj is interp.cmd_pipe: - try: - interp.HandleUserData() - except EOFError: - interp.logger.debug( - 'ec3po interpreter received EOF from cmd_pipe in ' - 'HandleUserData()') - continue_looping = False - - elif obj is shutdown_pipe: - interp.logger.debug( - 'ec3po interpreter received shutdown pipe unblocked notification') - continue_looping = False - - for obj in writeable: - # Send a command to the EC. - if obj is interp.ec_uart_pty: - interp.SendCmdToEC() - - except KeyboardInterrupt: - pass - - finally: - interp.cmd_pipe.close() - interp.dbg_pipe.close() - interp.ec_uart_pty.close() - if shutdown_pipe is not None: - shutdown_pipe.close() - interp.logger.debug('Exit ec3po interpreter loop for %s', - interp.ec_uart_pty_name) + """Starts an infinite loop of servicing the user and the EC. + + StartLoop checks to see if there are any commands to process, processing them + if any, and forwards EC output to the user. + + When sending a command to the EC, we send the command once and check the + response to see if the EC encountered an error when receiving the command. An + error condition is reported to the interpreter by a string with at least one + '&' and 'E'. The full string is actually '&&EE', however it's possible that + the leading ampersand or trailing 'E' could be dropped. If an error is + encountered, the interpreter will retry up to the amount configured. + + Args: + interp: An Interpreter object that has been properly initialised. + shutdown_pipe: A file object for a pipe or equivalent that becomes readable + (not blocked) to indicate that the loop should exit. Can be None to never + exit the loop. + """ + try: + # This is used instead of "break" to avoid exiting the loop in the middle of + # an iteration. + continue_looping = True + + while continue_looping: + # The inputs list is created anew in each loop iteration because the + # Interpreter class sometimes modifies the interp.inputs list. + if shutdown_pipe is None: + inputs = interp.inputs + else: + inputs = list(interp.inputs) + inputs.append(shutdown_pipe) + + readable, writeable, _ = select.select(inputs, interp.outputs, []) + + for obj in readable: + # Handle any debug prints from the EC. + if obj is interp.ec_uart_pty: + interp.HandleECData() + + # Handle any commands from the user. + elif obj is interp.cmd_pipe: + try: + interp.HandleUserData() + except EOFError: + interp.logger.debug( + "ec3po interpreter received EOF from cmd_pipe in " + "HandleUserData()" + ) + continue_looping = False + + elif obj is shutdown_pipe: + interp.logger.debug( + "ec3po interpreter received shutdown pipe unblocked notification" + ) + continue_looping = False + + for obj in writeable: + # Send a command to the EC. + if obj is interp.ec_uart_pty: + interp.SendCmdToEC() + + except KeyboardInterrupt: + pass + + finally: + interp.cmd_pipe.close() + interp.dbg_pipe.close() + interp.ec_uart_pty.close() + if shutdown_pipe is not None: + shutdown_pipe.close() + interp.logger.debug( + "Exit ec3po interpreter loop for %s", interp.ec_uart_pty_name + ) |