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Hierarchical Token Bucket traffic shaping.
Patterned after U{Martin Devera's Hierarchical Token Bucket traffic
shaper for the Linux kernel<http://luxik.cdi.cz/~devik/qos/htb/>}.
@seealso: U{HTB Linux queuing discipline manual - user guide
<http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm>}
@seealso: U{Token Bucket Filter in Linux Advanced Routing & Traffic Control
HOWTO<http://lartc.org/howto/lartc.qdisc.classless.html#AEN682>}
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�Bucketa�
Implementation of a Token bucket.
A bucket can hold a certain number of tokens and it drains over time.
@cvar maxburst: The maximum number of tokens that the bucket can
hold at any given time. If this is L{None}, the bucket has
an infinite size.
@type maxburst: C{int}
@cvar rate: The rate at which the bucket drains, in number
of tokens per second. If the rate is L{None}, the bucket
drains instantaneously.
@type rate: C{int}
N�maxburst�rater c �> � d| _ || _ t � | _ y)a(
Create a L{Bucket} that may have a parent L{Bucket}.
@param parentBucket: If a parent Bucket is specified,
all L{add} and L{drip} operations on this L{Bucket}
will be applied on the parent L{Bucket} as well.
@type parentBucket: L{Bucket}
r N)�content� parentBucketr �lastDrip)�selfr s �7/usr/lib/python3/dist-packages/twisted/protocols/htb.py�__init__zBucket.__init__3 s � � �� � (��� ���
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Adds tokens to the L{Bucket} and its C{parentBucket}.
This will add as many of the C{amount} tokens as will fit into both
this L{Bucket} and its C{parentBucket}.
@param amount: The number of tokens to try to add.
@type amount: C{int}
@returns: The number of tokens that actually fit.
@returntype: C{int}
)�dripr
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Bucket.add@ sk � �
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Let some of the bucket drain.
The L{Bucket} drains at the rate specified by the class
variable C{rate}.
@returns: C{True} if the bucket is empty after this drip.
@returntype: C{bool}
r )r r r r
r r �max)r �now� deltaTime� deltaTokenss r r z Bucket.dripX s� � � � � � (� � � � "� "� $� �9�9� � �D�L��&�C��d�m�m�+�I�#�d�i�i�/�K� �q�$�,�,��"<�=�D�L� �D�M��|�|�q� � r �N)
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IBucketFilterc � � y)zn
Return a L{Bucket} corresponding to the provided parameters.
@returntype: L{Bucket}
Nr' )�
somethings�some_kws r � getBucketForzIBucketFilter.getBucketForq s � r N)r r! r" r- r' r r r) r) p s � � r r) c �D � e Zd ZU dZeZdZee e d< dd�Z
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Filter things into buckets that can be nested.
@cvar bucketFactory: Class of buckets to make.
@type bucketFactory: L{Bucket}
@cvar sweepInterval: Seconds between sweeping out the bucket cache.
@type sweepInterval: C{int}
N�
sweepIntervalc �> � i | _ || _ t � | _ y r )�buckets� parentFilterr � lastSweep)r r3 s r r z!HierarchicalBucketFilter.__init__� s � ��� � (��� ���r c � � | j �4t � | j z
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Find or create a L{Bucket} corresponding to the provided parameters.
Any parameters are passed on to L{getBucketKey}, from them it
decides which bucket you get.
@returntype: L{Bucket}
N)
r0 r r4 �sweepr3 r- � getBucketKeyr2 �get�
bucketFactory)r �a�kwr �key�buckets r r- z%HierarchicalBucketFilter.getBucketFor� s� � �
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r c � � y)a%
Construct a key based on the input parameters to choose a L{Bucket}.
The default implementation returns the same key for all
arguments. Override this method to provide L{Bucket} selection.
@returns: Something to be used as a key in the bucket cache.
Nr' )r r: r; s r r7 z%HierarchicalBucketFilter.getBucketKey� s � � r c �� � | j j � D ]5 \ }}|j � }|j dk( s�&|s�)| j |= �7 t � | _ y)z'
Remove empty buckets.
r N)r2 �itemsr r& r r4 )r r< r= �bucket_is_emptys r r6 z HierarchicalBucketFilter.sweep� sV � � �<�<�-�-�/� &�K�C�� $�k�k�m�O�� � �A�%�?��L�L��%� &�
���r r )r r! r" r# r r9 r0 r r$ r% r r- r7 r6 r' r r r/ r/ y s0 � �� �M�#'�M�8�C�=�'� �
�4 � r r/ c � � e Zd ZdZdZd� Zy)� FilterByHostzF
A Hierarchical Bucket filter with a L{Bucket} for each host.
i� c �( � |j � d S �N� )�getPeer�r � transports r r7 zFilterByHost.getBucketKey� � � �� � �"�1�%�%r N�r r! r" r# r0 r7 r' r r rC rC � s � �� �M�&r rC c � � e Zd ZdZdZd� Zy)�FilterByServerzI
A Hierarchical Bucket filter with a L{Bucket} for each service.
Nc �( � |j � d S )N� )�getHostrH s r r7 zFilterByServer.getBucketKey� rJ r rK r' r r rM rM � s � �� �M�&r rM c �& � e Zd ZdZdZd� Zd� Zd� Zy)�ShapedConsumerzL
Wraps a C{Consumer} and shapes the rate at which it receives data.
Fc � � t j j | |� || _ | j xj dz
c_ y rE )r �ProducerConsumerProxyr r= r& )r �consumerr= s r r zShapedConsumer.__init__� s4 � � �!�!�*�*�4��:� �� � � � � � ��"� r c � � | j j t |� � }t j j | |d | � S r )r= r �lenr rT �_writeSomeData)r �datar s r rX z ShapedConsumer._writeSomeData� s9 � �
��� � ��T��+���(�(�7�7��d�7�F�m�L�Lr c � � t j j | � | j xj dz c_ y rE )r rT �
stopProducingr= r& )r s r r[ z ShapedConsumer.stopProducing� s+ � � �!�!�/�/��5� � � � � ��"� r N)r r! r" r# � iAmStreamingr rX r[ r' r r rR rR � s � �� �L�#�
M�#r rR c � � e Zd ZdZdZd� Zy)�ShapedTransportaR
Wraps a C{Transport} and shapes the rate at which it receives data.
This is a L{ShapedConsumer} with a little bit of magic to provide for
the case where the consumer it wraps is also a C{Transport} and people
will be attempting to access attributes this does not proxy as a
C{Consumer} (e.g. C{loseConnection}).
Fc �. � t | j |� S r )�getattrrU )r �names r � __getattr__zShapedTransport.__getattr__� s � � �t�}�}�d�+�+r N)r r! r" r# r\ rb r' r r r^ r^ � s � �� �L�,r r^ c � � e Zd ZdZd� Zd� Zy)�ShapedProtocolFactorya�
Dispense C{Protocols} with traffic shaping on their transports.
Usage::
myserver = SomeFactory()
myserver.protocol = ShapedProtocolFactory(myserver.protocol,
bucketFilter)
Where C{SomeServerFactory} is a L{twisted.internet.protocol.Factory}, and
C{bucketFilter} is an instance of L{HierarchicalBucketFilter}.
c � � || _ || _ y)a�
Tell me what to wrap and where to get buckets.
@param protoClass: The class of C{Protocol} this will generate
wrapped instances of.
@type protoClass: L{Protocol<twisted.internet.interfaces.IProtocol>}
class
@param bucketFilter: The filter which will determine how
traffic is shaped.
@type bucketFilter: L{HierarchicalBucketFilter}.
N)�protocol� bucketFilter)r �
protoClassrg s r r z ShapedProtocolFactory.__init__ s � � #��
� (��r c �` � �� � j |i |��}|j ��� fd�}||_ |S )z�
Make a C{Protocol} instance with a shaped transport.
Any parameters will be passed on to the protocol's initializer.
@returns: A C{Protocol} instance with a L{ShapedTransport}.
c �b �� �j j | � }t | |� } �|� S r )rg r- r^ )rI r= �shapedTransport�origMakeConnectionr s ��r �makeConnectionz6ShapedProtocolFactory.__call__.<locals>.makeConnection, s0 �� ��&�&�3�3�I�>�F� -�i�� @�O�%�o�6� 6r )rf rm )r r: r; �protorm rl s ` @r �__call__z ShapedProtocolFactory.__call__! s: �� � ��
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