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Basic protocols, such as line-oriented, netstring, and int prefixed strings.
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interfaces�protocol)�logc �n � dj t t | � � j d� d| dg� S )N� �ascii� :� ,)�join�str�len�encode)�datas �9/usr/lib/python3/dist-packages/twisted/protocols/basic.py�_formatNetstringr s- � � �8�8�S��T��^�*�*�7�3�T�4��F� G�Gr
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Convert some C{bytes} into netstring format.
@param data: C{bytes} that will be reformatted.
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The incoming data is not in valid Netstring format.
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Not enough data to complete a netstring.
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� Zd� Zd� Zd� Zd� Zd� Zd� Zd� Zd� Zd� Z d� Z d� Z d� Z d� Z d� Z!y ) �NetstringReceiveraM
A protocol that sends and receives netstrings.
See U{http://cr.yp.to/proto/netstrings.txt} for the specification of
netstrings. Every netstring starts with digits that specify the length
of the data. This length specification is separated from the data by
a colon. The data is terminated with a comma.
Override L{stringReceived} to handle received netstrings. This
method is called with the netstring payload as a single argument
whenever a complete netstring is received.
Security features:
1. Messages are limited in size, useful if you don't want
someone sending you a 500MB netstring (change C{self.MAX_LENGTH}
to the maximum length you wish to accept).
2. The connection is lost if an illegal message is received.
@ivar MAX_LENGTH: Defines the maximum length of netstrings that can be
received.
@type MAX_LENGTH: C{int}
@ivar _LENGTH: A pattern describing all strings that contain a netstring
length specification. Examples for length specifications are C{b'0:'},
C{b'12:'}, and C{b'179:'}. C{b'007:'} is not a valid length
specification, since leading zeros are not allowed.
@type _LENGTH: C{re.Match}
@ivar _LENGTH_PREFIX: A pattern describing all strings that contain
the first part of a netstring length specification (without the
trailing comma). Examples are '0', '12', and '179'. '007' does not
start a netstring length specification, since leading zeros are
not allowed.
@type _LENGTH_PREFIX: C{re.Match}
@ivar _PARSING_LENGTH: Indicates that the C{NetstringReceiver} is in
the state of parsing the length portion of a netstring.
@type _PARSING_LENGTH: C{int}
@ivar _PARSING_PAYLOAD: Indicates that the C{NetstringReceiver} is in
the state of parsing the payload portion (data and trailing comma)
of a netstring.
@type _PARSING_PAYLOAD: C{int}
@ivar brokenPeer: Indicates if the connection is still functional
@type brokenPeer: C{int}
@ivar _state: Indicates if the protocol is consuming the length portion
(C{PARSING_LENGTH}) or the payload (C{PARSING_PAYLOAD}) of a netstring
@type _state: C{int}
@ivar _remainingData: Holds the chunk of data that has not yet been consumed
@type _remainingData: C{string}
@ivar _payload: Holds the payload portion of a netstring including the
trailing comma
@type _payload: C{BytesIO}
@ivar _expectedPayloadSize: Holds the payload size plus one for the trailing
comma.
@type _expectedPayloadSize: C{int}
韆 s (0|[1-9]\d*)(:)s
(0|[1-9]\d*)$zBThe received netstring does not start with a length specification.zpThe length specification of the received netstring cannot be represented in Python - it causes an OverflowError!zQThe received netstring is longer than the maximum %s specified by self.MAX_LENGTHz4The received netstring is not terminated by a comma.� c � � t j j | |� d| _ d| _ t � | _ | j | _ d| _ d| _
y)z+
Initializes the protocol.
r
r N) r
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brokenPeer)�self� transports r r) z NetstringReceiver.makeConnection� sO � � ���(�(��y�9� !���#$�� � � ��
��*�*�� �$%��!���r
c �L � | j j t |� � y)a1
Sends a netstring.
Wraps up C{string} by adding length information and a
trailing comma; writes the result to the transport.
@param string: The string to send. The necessary framing (length
prefix, etc) will be added.
@type string: C{bytes}
N)r2 �writer �r1 �strings r �
sendStringz NetstringReceiver.sendString� s � �
��� � � -�f� 5�6r
c �� � | xj |z
c_ | j r | j � | j r� yy# t $ r Y yt $ r | j � Y yw xY w)a=
Receives some characters of a netstring.
Whenever a complete netstring is received, this method extracts
its payload and calls L{stringReceived} to process it.
@param data: A chunk of data representing a (possibly partial)
netstring
@type data: C{bytes}
N)r* � _consumeDatar" r �_handleParseError�r1 r s r � dataReceivedz NetstringReceiver.dataReceived� se � �
���t�#���!�!�
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Override this for notification when each complete string is received.
@param string: The complete string which was received with all
framing (length prefix, etc) removed.
@type string: C{bytes}
@raise NotImplementedError: because the method has to be implemented
by the child class.
��NotImplementedErrorr5 s r �stringReceivedz NetstringReceiver.stringReceived� s
� � "�#�#r
c �l � t j t j | j � � dz S )z�
Calculate and return the string size of C{self.MAX_LENGTH}.
@return: The size of the string representation for C{self.MAX_LENGTH}
@rtype: C{float}
� )�math�ceil�log10�
MAX_LENGTH�r1 s r �_maxLengthSizez NetstringReceiver._maxLengthSize� s% � � �y�y����D�O�O�4�5��9�9r
c �� � | j | j k( r | j � | j � | j | j k( r| j � yy)a0
Consumes the content of C{self._remainingData}.
@raise IncompleteNetstring: if C{self._remainingData} does not
contain enough data to complete the current netstring.
@raise NetstringParseError: if the received data do not
form a valid netstring.
N)r. r- �_consumeLength� _prepareForPayloadConsumption�_PARSING_PAYLOAD�_consumePayloadrG s r r9 z NetstringReceiver._consumeData� sQ � � �;�;�$�.�.� .� � � � !� � .� .� 0� �;�;�$�/�/� /� � � � "� 0r
c � � | j j | j � }|s| j � t � �| j |� y)aL
Consumes the length portion of C{self._remainingData}.
@raise IncompleteNetstring: if C{self._remainingData} contains
a partial length specification (digits without trailing
comma).
@raise NetstringParseError: if the received data do not form a valid
netstring.
N)�_LENGTH�matchr* � _checkPartialLengthSpecificationr" �_processLength)r1 � lengthMatchs r rJ z NetstringReceiver._consumeLength� sD � � �l�l�(�(��)<�)<�=� �� � 1� 1� 3�%�'� '� ���K�(r
c � � | j j | j � }|st | j � �|j d� }| j
|� y)aB
Makes sure that the received data represents a valid number.
Checks if C{self._remainingData} represents a number smaller or
equal to C{self.MAX_LENGTH}.
@raise NetstringParseError: if C{self._remainingData} is no
number or is too big (checked by L{_extractLength}).
rB N)�_LENGTH_PREFIXrP r* r �_MISSING_LENGTH�group�_extractLength)r1 �partialLengthMatch�lengthSpecifications r rQ z2NetstringReceiver._checkPartialLengthSpecification� sU � � "� 0� 0� 6� 6�t�7J�7J� K��!�%�d�&:�&:�;� ;� 0� 6� 6�q� 9�� ��� /�0r
c � � |j d� }|j d� }| j d| }| j |� dz | _ | j |d | _ y)aY
Processes the length definition of a netstring.
Extracts and stores in C{self._expectedPayloadSize} the number
representing the netstring size. Removes the prefix
representing the length specification from
C{self._remainingData}.
@raise NetstringParseError: if the received netstring does not
start with a number or the number is bigger than
C{self.MAX_LENGTH}.
@param lengthMatch: A regular expression match object matching
a netstring length specification
@type lengthMatch: C{re.Match}
rB r& N)�endr* rX r/ )r1 rS � endOfNumber� startOfData� lengthStrings r rR z NetstringReceiver._processLength s_ � � "�o�o�a�(� �!�o�o�a�(� ��*�*�<�K�8� �$(�$7�$7� �$E��$I��!� "� 1� 1�+�,� ?��r
c � � | j |� t |� }|| j kD r#t | j | j fz � �|S )ay
Attempts to extract the length information of a netstring.
@raise NetstringParseError: if the number is bigger than
C{self.MAX_LENGTH}.
@param lengthAsString: A chunk of data starting with a length
specification
@type lengthAsString: C{bytes}
@return: The length of the netstring
@rtype: C{int}
)�_checkStringSize�intrF r � _TOO_LONG)r1 �lengthAsString�lengths r rX z NetstringReceiver._extractLength sH � �
� � �n�-��^�$�� �D�O�O� #�%�d�n�n����7I�&I�J� J��
r
c � � t |� | j � kD r#t | j | j fz � �y)a>
Checks the sanity of lengthAsString.
Checks if the size of the length specification exceeds the
size of the string representing self.MAX_LENGTH. If this is
not the case, the number represented by lengthAsString is
certainly bigger than self.MAX_LENGTH, and a
NetstringParseError can be raised.
This method should make sure that netstrings with extremely
long length specifications are refused before even attempting
to convert them to an integer (which might trigger a
MemoryError).
N)r rH r rc rF )r1 rd s r ra z"NetstringReceiver._checkStringSize) s: � � �~� ��!4�!4�!6� 6�%�d�n�n����7I�&I�J� J� 7r
c � � | j | _ d| _ | j j d� | j j � y)zW
Sets up variables necessary for consuming the payload of a netstring.
r N)rL r. r+ r, �seek�truncaterG s r rK z/NetstringReceiver._prepareForPayloadConsumption; s; � � �+�+�� �#$�� � �
�
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c �� � | j � | j | j k r
t � �| j � | j
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Consumes the payload portion of C{self._remainingData}.
If the payload is complete, checks for the trailing comma and
processes the payload. If not, raises an L{IncompleteNetstring}
exception.
@raise IncompleteNetstring: if the payload received so far
contains fewer characters than expected.
@raise NetstringParseError: if the payload does not end with a
comma.
N)�_extractPayloadr+ r/ r" �_checkForTrailingCommar- r. �_processPayloadrG s r rM z!NetstringReceiver._consumePayloadD sR � �
� � � � � #� #�d�&?�&?� ?�%�'� '� �#�#�%��*�*�� � � � � r
c � � | j � rg| j | j z
}| j j | j
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c_ d| _ y)a
Extracts payload information from C{self._remainingData}.
Splits C{self._remainingData} at the end of the netstring. The
first part becomes C{self._payload}, the second part is stored
in C{self._remainingData}.
If the netstring is not yet complete, the whole content of
C{self._remainingData} is moved to C{self._payload}.
Nr
)�_payloadCompleter/ r+ r, r4 r* r )r1 �remainingPayloadSizes r rk z!NetstringReceiver._extractPayloadX s� � � � � � "�#'�#<�#<�t�?W�?W�#W� � �M�M� � �� 3� 3�4I�5I� J� K�"&�"5�"5�6J�6K�"L�D� �'+�'@�'@�D� $� �M�M� � �� 3� 3� 4� � $� $��D�,?�,?�(@� @� $�"%�D� r
c �` � t | j � | j z | j k\ S )a
Checks if enough data have been received to complete the netstring.
@return: C{True} iff the received data contain at least as many
characters as specified in the length section of the
netstring
@rtype: C{bool}
)r r* r+ r/ rG s r ro z"NetstringReceiver._payloadCompletem s0 � �
��#�#� $�t�'?�'?� ?��(�(�
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r
c �\ � | j | j j � dd � y)z�
Processes the actual payload with L{stringReceived}.
Strips C{self._payload} of the trailing comma and calls
L{stringReceived} with the result.
N���)r@ r, �getvaluerG s r rm z!NetstringReceiver._processPayload{ s& � �
���D�M�M� 2� 2� 4�S�b� 9�:r
c �n � | j j � dd dk7 rt | j � �y)z�
Checks if the netstring has a trailing comma at the expected position.
@raise NetstringParseError: if the last payload character is
anything but a comma.
rs Nr )r, rt r �_MISSING_COMMArG s r rl z(NetstringReceiver._checkForTrailingComma� s6 � � �=�=� !� !� #�B�C� (�D� 0�%�d�&9�&9�:� :� 1r
c �F � | j j � d| _ y)zQ
Terminates the connection and sets the flag C{self.brokenPeer}.
rB N)r2 �loseConnectionr0 rG s r r: z#NetstringReceiver._handleParseError� s � �
���%�%�'���r
N)"r r r r rF �re�compilerO rU rV � _OVERFLOWrc rv �ranger- rL r) r7 r< r@ rH r9 rJ rQ rR rX ra rK rM rk ro rm rl r: r r
r r$ r$ 5 s� � �=�~ �J��b�j�j�,�-�G� �R�Z�Z� 1�2�N� P� � � � '� � L�N� ).�a��%�O�%�
� 7��* $�:�
#� )� 1� @�.�$K�$!� �(&�*
� ;�;� r
r$ c �4 � e Zd ZdZdZdZdZd� Zd� Zd� Z d� Z
y )
�LineOnlyReceivera�
A protocol that receives only lines.
This is purely a speed optimisation over LineReceiver, for the
cases that raw mode is known to be unnecessary.
@cvar delimiter: The line-ending delimiter to use. By default this is
C{b'\r\n'}.
@cvar MAX_LENGTH: The maximum length of a line to allow (If a
sent line is longer than this, the connection is dropped).
Default is 16384.
r
�
� @ c � � | j |z j | j � }|j d� | _ |D ]V }| j j
r yt
|� | j kD r| j |� c S | j |� �X t
| j � | j kD r| j | j � S y)zF
Translates bytes into lines, and calls lineReceived.
rs N)
�_buffer�split� delimiter�popr2 �
disconnectingr rF �lineLengthExceeded� lineReceived)r1 r �lines�lines r r< z LineOnlyReceiver.dataReceived� s� � � � � ��$�+�+�D�N�N�;�� �y�y��}�� ��
(�D��~�~�+�+�
��4�y�4�?�?�*��.�.�t�4�4��!�!�$�'�
(� �t�|�|� �t��� .��*�*�4�<�<�8� 8� /r
c � � t ��z�
Override this for when each line is received.
@param line: The line which was received with the delimiter removed.
@type line: C{bytes}
r> �r1 r� s r r� z LineOnlyReceiver.lineReceived� �
� � "�!r
c �P � | j j || j f� S �z�
Sends a line to the other end of the connection.
@param line: The line to send, not including the delimiter.
@type line: C{bytes}
)r2 �
writeSequencer� r� s r �sendLinezLineOnlyReceiver.sendLine� s" � � �~�~�+�+�T�4�>�>�,B�C�Cr
c �6 � | j j � S )z�
Called when the maximum line length has been reached.
Override if it needs to be dealt with in some special way.
�r2 rx r� s r r� z#LineOnlyReceiver.lineLengthExceeded� s � �
�~�~�,�,�.�.r
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r r~ r~ � s- � � � �G��I��J�9�("�D�/r
r~ c �" � e Zd ZdZd� Zd� Zd� Zy)�_PauseableMixinFc �F � d| _ | j j � y �NT)�pausedr2 �pauseProducingrG s r r� z _PauseableMixin.pauseProducing� s � ��� � ���%�%�'r
c �h � d| _ | j j � | j d� y )NFr
)r� r2 �resumeProducingr< rG s r r� z _PauseableMixin.resumeProducing� s' � ��� � ���&�&�(� ���#� r
c �F � d| _ | j j � y r� )r� r2 �
stopProducingrG s r r� z _PauseableMixin.stopProducing� s � ��� � ���$�$�&r
N)r r r r� r� r� r� r r
r r� r� � s � �
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r� c �V � e Zd ZdZdZdZdZdZdZd� Z d� Z
dd �Z d
� Z d � Z
d � Zd
� Zd� Zy)� LineReceivera�
A protocol that receives lines and/or raw data, depending on mode.
In line mode, each line that's received becomes a callback to
L{lineReceived}. In raw data mode, each chunk of raw data becomes a
callback to L{LineReceiver.rawDataReceived}.
The L{setLineMode} and L{setRawMode} methods switch between the two modes.
This is useful for line-oriented protocols such as IRC, HTTP, POP, etc.
@cvar delimiter: The line-ending delimiter to use. By default this is
C{b'\r\n'}.
@cvar MAX_LENGTH: The maximum length of a line to allow (If a
sent line is longer than this, the connection is dropped).
Default is 16384.
rB r
Fr r� c �. � | j dc}| _ |S )zs
Clear buffered data.
@return: All of the cleared buffered data.
@rtype: C{bytes}
r
)r� )r1 �bs r �clearLineBufferz LineReceiver.clearLineBuffer� s � � �,�,����4�<��r
c � � | j r| xj |z
c_ y d| _ | xj |z
c_ | j �r$| j �s| j r� | j j | j
d� \ }| _ t
|� }|| j kD r;|| j
z | j z }d| _ | j |� d| _ S | j |� }|s"| j rN| j j r8|d| _ S | j }d| _ | j |� }|r |d| _ S | j r| j s��d| _ y# t $ rp t
| j � | j t
| j
� z k\ r.| j dc}| _ | j |� cY d| _ S Y d| _ yw xY w# d| _ w xY w)z�
Protocol.dataReceived.
Translates bytes into lines, and calls lineReceived (or
rawDataReceived, depending on mode.)
NTrB r
F)�_busyReceivingr� r� � line_moder� r� r rF r� r� r2 r� �
ValueError�rawDataReceived)r1 r r� �
lineLength�exceeded�whys r r< zLineReceiver.dataReceived s� � � � � � �L�L�D� �L� � (�"&�D� � �L�L�D� �L��,�,�t�{�{��>�>�'�-1�\�\�-?�-?����PQ�-R�*��d�l� &)��Y�
�%����7�'+�d�n�n�'<�t�|�|�'K�H�+.�D�L�#'�#:�#:�8�#D� #(�D� � #� /� /�� 5�� �$�.�.�T�^�^�5Q�5Q�#&� #(�D� �
�<�<�D�#&�D�L� �.�.�t�4�C�� "�"'�D� �3 �,�,�t�{�{�2 #(�D� ��+ &� � �t�|�|�,�� � �3�t�~�~�CV�1V�W�15� � �s� .�D�$�,�#'�#:�#:�4�#@� @�$ #(�D� �# �" #(�D� �+ ��* #(�D� �sJ �AG5 �'.E9 �A
G5 �*6G5 �('G5 �G5 �9A&G2� G5 �(G5 �1G2�2G5 �5 G>c �8 � d| _ |r| j |� S y)a�
Sets the line-mode of this receiver.
If you are calling this from a rawDataReceived callback,
you can pass in extra unhandled data, and that data will
be parsed for lines. Further data received will be sent
to lineReceived rather than rawDataReceived.
Do not pass extra data if calling this function from
within a lineReceived callback.
rB N)r� r< )r1 �extras r � setLineModezLineReceiver.setLineMode1 s$ � � ��� ��$�$�U�+� +� r
c � � d| _ y)z�
Sets the raw mode of this receiver.
Further data received will be sent to rawDataReceived rather
than lineReceived.
r N)r� rG s r �
setRawModezLineReceiver.setRawModeA s � � ��r
c � � t �)z>
Override this for when raw data is received.
r> r; s r r� z LineReceiver.rawDataReceivedI s
� � "�!r
c � � t �r� r> r� s r r� zLineReceiver.lineReceivedO r� r
c �R � | j j || j z � S r� )r2 r4 r� r� s r r� zLineReceiver.sendLineX s" � � �~�~�#�#�D�4�>�>�$9�:�:r
c �6 � | j j � S )aw
Called when the maximum line length has been reached.
Override if it needs to be dealt with in some special way.
The argument 'line' contains the remainder of the buffer, starting
with (at least some part) of the line which is too long. This may
be more than one line, or may be only the initial portion of the
line.
r� r� s r r� z LineReceiver.lineLengthExceededa s � � �~�~�,�,�.�.r
N)r
)r r r r r� r� r� r� rF r� r< r� r� r� r� r� r� r r
r r� r� � sK � ��" �I��G��N��I��J��&(�P,� �"� "�;�
/r
r� c � � e Zd ZdZy)�StringTooLongErrorzZ
Raised when trying to send a string too long for a length prefixed
protocol.
Nr r r
r r� r� n s � �r
r� c � � e Zd ZdZdd�Zy)�_RecvdCompatHackaK
Emulates the to-be-deprecated C{IntNStringReceiver.recvd} attribute.
The C{recvd} attribute was where the working buffer for buffering and
parsing netstrings was kept. It was updated each time new data arrived and
each time some of that data was parsed and delivered to application code.
The piecemeal updates to its string value were expensive and have been
removed from C{IntNStringReceiver} in the normal case. However, for
applications directly reading this attribute, this descriptor restores that
behavior. It only copies the working buffer when necessary (ie, when
accessed). This avoids the cost for applications not using the data.
This is a custom descriptor rather than a property, because we still need
the default __set__ behavior in both new-style and old-style subclasses.
Nc �4 � |j |j d S �N)� _unprocessed�_compatibilityOffset)r1 �oself�types r �__get__z_RecvdCompatHack.__get__� s � ��!�!�%�"<�"<�">�?�?r
r� )r r r r r� r r
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Generic class for length prefixed protocols.
@ivar _unprocessed: bytes received, but not yet broken up into messages /
sent to stringReceived. _compatibilityOffset must be updated when this
value is updated so that the C{recvd} attribute can be generated
correctly.
@type _unprocessed: C{bytes}
@ivar structFormat: format used for struct packing/unpacking. Define it in
subclass.
@type structFormat: C{str}
@ivar prefixLength: length of the prefix, in bytes. Define it in subclass,
using C{struct.calcsize(structFormat)}
@type prefixLength: C{int}
@ivar _compatibilityOffset: the offset within C{_unprocessed} to the next
message to be parsed. (used to generate the recvd attribute)
@type _compatibilityOffset: C{int}
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Override this for notification when each complete string is received.
@param string: The complete string which was received with all
framing (length prefix, etc) removed.
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Callback invoked when a length prefix greater than C{MAX_LENGTH} is
received. The default implementation disconnects the transport.
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@type length: C{int}
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Convert int prefixed strings into calls to stringReceived.
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Send a prefixed string to the other end of the connection.
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prefix, etc) will be added.
@type string: C{bytes}
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A receiver for int32-prefixed strings.
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the string encoded in network byte order.
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A receiver for int16-prefixed strings.
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A stateful string protocol.
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connection will be closed immediately.
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@type state: C{str}
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Choose a protocol phase function and call it.
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what each C{proto_*} function returns. (For example, if
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next function called when a protocol message is received.
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A producer that sends the contents of a file to a consumer.
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the same. All bytes read from the file are passed through this before
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