def deserialize(self, data, cursor=0):
result, cursor = self.MESSAGE_HEADER.deserialize(data, cursor)
magic, command, length = result
pos = string.find(command, "\0")
if (pos != -1):
command = command[0:pos]
if (command not in COMMANDS_TYPES):
raise FormatErrorException("Error: unknown command : %s" % (command))
if ( ENCODERS[COMMANDS_TYPES[command]] == None):
raise FormatErrorException("Error: Unsupported command : %s" % (command))
msg_type = COMMANDS_TYPES[command]
#if (msg_type != MSG_VERSION and msg_type != MSG_VERACK):
checksum = data[cursor:cursor+4]
cursor += 4
startplayload = cursor
#raise FormatErrorException("Checksum error in command: %s %s != %s" % (command, hexdump1(checksum,""), hexdump1(verify,"")))
if (magic != MAGICS[self.runmode]):
raise FormatErrorException("Error: wrong magic : expected:%s received:%s" % (MAGICS[self.runmode], magic))
if (len(data) - cursor < length):
raise MissingDataException("Command incomplete: %s" % (command))
#self.log.debug("Decoding: %s" % (command))
res, cursor = ENCODERS[COMMANDS_TYPES[command]].deserialize(data, cursor)
#verify checksum after decoding (required to identify message boundaries)
#if (msg_type != MSG_VERSION and msg_type != MSG_VERACK):
verify = sha256checksum(data[startplayload:cursor])
if (checksum != verify):
#raise FormatErrorException("Checksum error in command: %s %s != %s" % (command, hexdump1(checksum,""), hexdump1(verify,"")))
raise FormatErrorException( "Checksum error in command: %s %s != %s" % (command, hexstr(checksum), hexstr(verify)))
return (res, cursor)
def serialize(self, msg):
if (msg.type not in ENCODERS):
raise FormatErrorException("Encoder not found for type: %d" % (msg.type))
payload = ENCODERS[msg.type].serialize(msg)
result = self.MESSAGE_HEADER.serialize([MAGICS[self.runmode],
COMMANDS[msg.type],
len(payload)])
result += sha256checksum(payload)
result += payload
return (result)
def serialize(self, msg):
if (msg.type not in ENCODERS):
raise FormatErrorException("Encoder not found for type: %d" %
(msg.type))
payload = ENCODERS[msg.type].serialize(msg)
result = self.MESSAGE_HEADER.serialize(
[MAGICS[self.runmode], COMMANDS[msg.type],
len(payload)])
result += sha256checksum(payload)
result += payload
return (result)
def deserialize(self, data, cursor=0):
result, cursor = self.MESSAGE_HEADER.deserialize(data, cursor)
magic, command, length = result
pos = string.find(command, "\0")
if (pos != -1):
command = command[0:pos]
if (command not in COMMANDS_TYPES):
raise FormatErrorException("Error: unknown command : %s" %
(command))
if (ENCODERS[COMMANDS_TYPES[command]] == None):
raise FormatErrorException("Error: Unsupported command : %s" %
(command))
msg_type = COMMANDS_TYPES[command]
#if (msg_type != MSG_VERSION and msg_type != MSG_VERACK):
checksum = data[cursor:cursor + 4]
cursor += 4
startplayload = cursor
#raise FormatErrorException("Checksum error in command: %s %s != %s" % (command, hexdump1(checksum,""), hexdump1(verify,"")))
if (magic != MAGICS[self.runmode]):
raise FormatErrorException(
"Error: wrong magic : expected:%s received:%s" %
(MAGICS[self.runmode], magic))
if (len(data) - cursor < length):
raise MissingDataException("Command incomplete: %s" % (command))
#self.log.debug("Decoding: %s" % (command))
res, cursor = ENCODERS[COMMANDS_TYPES[command]].deserialize(
data, cursor)
#verify checksum after decoding (required to identify message boundaries)
#if (msg_type != MSG_VERSION and msg_type != MSG_VERACK):
verify = sha256checksum(data[startplayload:cursor])
if (checksum != verify):
#raise FormatErrorException("Checksum error in command: %s %s != %s" % (command, hexdump1(checksum,""), hexdump1(verify,"")))
raise FormatErrorException(
"Checksum error in command: %s %s != %s" %
(command, hexstr(checksum), hexstr(verify)))
return (res, cursor)
