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|t d| d�V dS )a� Create a text output frame to render text to people.
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formatters to be applied at rendering time. In terms of the ``ui``
class, each atom corresponds to a ``ui.write()``.
s! must use bytes formatting stringss must use bytes for argumentss must use bytes for labels�ascii�replacec S s g | ]}|� d d��d ��qS )zutf-8r� ��decoderz )r r� r r r �
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�r� c @ s, e Zd ZdZefdd�Zdd� Zdd� ZdS ) � bufferingcommandresponseemittera� Helper object to emit command response frames intelligently.
Raw command response data is likely emitted in chunks much smaller
than what can fit in a single frame. This class exists to buffer
chunks until enough data is available to fit in a single frame.
TODO we'll need something like this when compression is supported.
So it might make sense to implement this functionality at the stream
level.
c C s" || _ || _|| _g | _d| _d S �Nr )�_stream�
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� |� t|�| _ dS )z�Send new data for emission.
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data to frames.
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S ) �identityencoderz3Encoder for the "identity" stream encoding profile.c C s d S �Nr �r= �uir r r r� � s zidentityencoder.__init__c C s |S r� r �r= rX r r r rz � s zidentityencoder.encodec C s dS �Nr r �r= r r r r � s zidentityencoder.flushc C s dS r� r r� r r r �finish� s zidentityencoder.finishN)r, r- r. r/ r� rz r r� r r r r r� � s
r� c @ s e Zd ZdZdd� Zdd� ZdS )�identitydecoderz3Decoder for the "identity" stream encoding profile.c C s |rt �td���d S )Ns6 identity decoder received unexpected additional values)r r[ r �r= r� � extraobjsr r r r� � s �zidentitydecoder.__init__c C s |S r� r r� r r r r� � s zidentitydecoder.decodeN)r, r- r. r/ r� r� r r r r r� � s r� c @ s, e Zd Zdd� Zdd� Zdd� Zdd� Zd S )
� zlibencoderc C s dd l }|| _|�� | _d S r� )�zlib�_zlib� compressobj� _compressor)r= r� r� r r r r� � s zzlibencoder.__init__c C s | j �|�S r� �r� �compressr� r r r rz � s zzlibencoder.encodec C s | j �| jj�S r� )r� r r� � Z_SYNC_FLUSHr� r r r r � s zzlibencoder.flushc C s | j �| jj�}d | _ |S r� )r� r r� �Z_FINISH�r= �resr r r r� � s zzlibencoder.finishN�r, r- r. r� rz r r� r r r r r� � s r� c @ s e Zd Zdd� Zdd� ZdS )� zlibdecoderc C s( dd l }|rt�td���|�� | _d S )Nr s2 zlib decoder received unexpected additional values)r� r r[ r �
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�zstdbaseencoderc C s, ddl m} || _|j|d�}|�� | _d S )Nr ��zstd)�level)� r� �_zstdZZstdCompressorr� r� )r= r� r� Zcctxr r r r� s zzstdbaseencoder.__init__c C s | j �|�S r� r� r� r r r rz
s zzstdbaseencoder.encodec C s | j �| jj�S r� )r� r r� ZCOMPRESSOBJ_FLUSH_BLOCKr� r r r r s zzstdbaseencoder.flushc C s | j �| jj�}d | _ |S r� )r� r r� ZCOMPRESSOBJ_FLUSH_FINISHr� r r r r� s zzstdbaseencoder.finishNr� r r r r r� s r� c s e Zd Z� fdd�Z� ZS )�zstd8mbencoderc s t t| ��d� d S )Nr )�superr� r� r� �� __class__r r r� s zzstd8mbencoder.__init__�r, r- r. r� �
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maxwindowsizer� Zdctxr r r r� " s zzstdbasedecoder.__init__c C s | j �|�S r� )r� r� r� r r r r� ( s zzstdbasedecoder.decodeNr� r r r r r� ! s r� c s e Zd Z� fdd�Z� ZS )�zstd8mbdecoderc s( |rt �td���tt| �jdd� d S )Ns5 zstd8mb decoder received unexpected additional valuesi � )r� )r r[ r r� r� r� r� r� r r r� - s
�zzstd8mbdecoder.__init__r� r r r� r r� , s r� c C s� t rd S zddlm} | j W n ty4 d } Y n0 | rPttft d< t�d� t t
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r� c @ s" e Zd ZdZddd�Zdd� ZdS ) rm z5Represents a logical unidirectional series of frames.Fc C s || _ || _d S r� )r3 �_active�r= r3 �activer r r r� V s zstream.__init__c C s, d}| j s|tO }d| _ t|| j||||�S )�}Create a frame to be sent out over this stream.
Only returns the frame instance. Does not actually send it.
r T)r� �STREAM_FLAG_BEGIN_STREAMrH r3 )r= r2 r5 r' r: r4 r r r rH Z s �zstream.makeframeN)F)r, r- r. r/ r� rH r r r r rm S s
rm c s: e Zd ZdZd � fdd� Zdd� Zdd� Zd d
� Z� ZS ) � inputstreamz,Represents a stream used for receiving data.Fc s t t| �j||d� d | _d S )N�r� )r� r� r� �_decoderr� r� r r r� l s zinputstream.__init__c C s2 |t vrt�td�| ��t | d ||�| _dS )z�Set the decoder for this stream.
Receives the stream profile name and any additional CBOR objects
decoded from the stream encoding settings frame payloads.
s unknown stream decoder: %sr N)r� r r[ r r� )r= r� r? r� r r r �
setdecoderp s zinputstream.setdecoderc C s | j s
|S | j �|�S r� )r� r� r� r r r r� { s zinputstream.decodec C s | j s
dS | j �� S r� )r� r r� r r r r � s zinputstream.flush)F) r, r- r. r/ r� r� r� r r� r r r� r r� i s
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� Z S )� outputstreamz*Represents a stream used for sending data.Fc s* t t| �j||d� d| _d | _d | _d S )Nr� F)r� r� r� ry �_encoder� _encodernamer� r� r r r� � s zoutputstream.__init__c C s6 |t vrt�td�| ��t | d |�| _|| _dS )zTSet the encoder for this stream.
Receives the stream profile name.
s unknown stream encoder: %sr N)r� r r[ r r� r� )r= r� r? r r r �
setencoder� s zoutputstream.setencoderc C s | j s
|S | j �|�S r� )r� rz r� r r r rz � s zoutputstream.encodec C s | j s
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dS | j �� d S r� )r� r� r� r r r r� � s zoutputstream.finishc C s^ d}| j s|tO }d| _ |r4| js,t�d��|tO }|tkrJ|t@ rJd| _t|| j ||||�S )r� r Ts@ attempting to send encoded frame without sending stream settings)
r� r� ry r �ProgrammingError� STREAM_FLAG_ENCODING_APPLIED�FRAME_TYPE_STREAM_SETTINGS�!FLAG_STREAM_ENCODING_SETTINGS_EOSrH r3 )r= r2 r5 r' r: rx r4 r r r rH � s$ ����zoutputstream.makeframec C s2 | j r | jrdS d�t�| j��}| �|tt|�S )z�Create a stream settings frame for this stream.
Returns frame data or None if no stream settings frame is needed or has
already been sent.
Nr ) r� ry r$ r rM r� rH r� r� )r= r2 r: r r r �makestreamsettingsframe� s �z$outputstream.makestreamsettingsframe)F)F) r, r- r. r/ r� r� rz r r� rH r� r� r r r� r r� � s
r� c C s | j d rt�d| j ��d S )Nr sA server should only write to even numbered streams; %d is not even)r3 r r� )rm r r r �ensureserverstream� s
��r� � contentencodingsr� c @ s� e Zd ZdZd(dd�Zdd� Zdd� Zd d
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serverreactora> Holds state of a server handling frame-based protocol requests.
This class is the "brain" of the unified frame-based protocol server
component. While the protocol is stateless from the perspective of
requests/commands, something needs to track which frames have been
received, what frames to expect, etc. This class is that thing.
Instances are modeled as a state machine of sorts. Instances are also
reactionary to external events. The point of this class is to encapsulate
the state of the connection and the exchange of frames, not to perform
work. Instead, callers tell this class when something occurs, like a
frame arriving. If that activity is worthy of a follow-up action (say
*run a command*), the return value of that handler will say so.
I/O and CPU intensive operations are purposefully delegated outside of
this class.
Consumers are expected to tell instances when events occur. They do so by
calling the various ``on*`` methods. These methods return a 2-tuple
describing any follow-up action(s) to take. The first element is the
name of an action to perform. The second is a data structure (usually
a dict) specific to that action that contains more information. e.g.
if the server wants to send frames back to the client, the data structure
will contain a reference to those frames.
Valid actions that consumers can be instructed to take are:
sendframes
Indicates that frames should be sent to the client. The ``framegen``
key contains a generator of frames that should be sent. The server
assumes that all frames are sent to the client.
error
Indicates that an error occurred. Consumer should probably abort.
runcommand
Indicates that the consumer should run a wire protocol command. Details
of the command to run are given in the data structure.
wantframe
Indicates that nothing of interest happened and the server is waiting on
more frames from the client before anything interesting can be done.
noop
Indicates no additional action is required.
Known Issues
------------
There are no limits to the number of partially received commands or their
size. A malicious client could stream command request data and exhaust the
server's memory.
Partially received commands are not acted upon when end of input is
reached. Should the server error if it receives a partial request?
Should the client send a message to abort a partially transmitted request
to facilitate graceful shutdown?
Active requests that haven't been responded to aren't tracked. This means
that if we receive a command and instruct its dispatch, another command
with its request ID can come in over the wire and there will be a race
between who responds to what.
Fc C sR || _ || _d| _d| _g | _i | _i | _i | _t� | _ d| _
t t �| _
t� dS )a� Construct a new server reactor.
``deferoutput`` can be used to indicate that no output frames should be
instructed to be sent until input has been exhausted. In this mode,
events that would normally generate output frames (such as a command
response being ready) will instead defer instructing the consumer to
send those frames. This is useful for half-duplex transports where the
sender cannot receive until all data has been transmitted.
� initialr N)�_ui� _deferoutput�_state�_nextoutgoingstreamid�_bufferedframegens�_incomingstreams�_outgoingstreams�_receivingcommands�set�_activecommands�_protocolsettingsdecoder�dict�DEFAULT_PROTOCOL_SETTINGS�_sendersettingsr� )r= r� Z deferoutputr r r r� - s
zserverreactor.__init__c C s� |j d s$d| _| �td�|j �S |j | jvr`|jt@ sNd| _| �td��S t|j �| j|j < |jt@ rzd| _t �
d��|jt @ r�| j|j = | j | j
| j| j| jd�}|�| j�}|s�t �
d| j ��||�S )z�Process a frame that has been received off the wire.
Returns a dict with an ``action`` key that details what action,
if any, the consumer should take next.
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noop
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sendframes
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error
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responsedata
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