/usr/lib/python3/dist-packages/twisted/protocols/__pycache__
Edit: /usr/lib/python3/dist-packages/twisted/protocols/__pycache__/amp.cpython-310.pyc (95667B)
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This module implements AMP, the Asynchronous Messaging Protocol.
AMP is a protocol for sending multiple asynchronous request/response pairs over
the same connection. Requests and responses are both collections of key/value
pairs.
AMP is a very simple protocol which is not an application. This module is a
"protocol construction kit" of sorts; it attempts to be the simplest wire-level
implementation of Deferreds. AMP provides the following base-level features:
- Asynchronous request/response handling (hence the name)
- Requests and responses are both key/value pairs
- Binary transfer of all data: all data is length-prefixed. Your
application will never need to worry about quoting.
- Command dispatching (like HTTP Verbs): the protocol is extensible, and
multiple AMP sub-protocols can be grouped together easily.
The protocol implementation also provides a few additional features which are
not part of the core wire protocol, but are nevertheless very useful:
- Tight TLS integration, with an included StartTLS command.
- Handshaking to other protocols: because AMP has well-defined message
boundaries and maintains all incoming and outgoing requests for you, you
can start a connection over AMP and then switch to another protocol.
This makes it ideal for firewall-traversal applications where you may
have only one forwarded port but multiple applications that want to use
it.
Using AMP with Twisted is simple. Each message is a command, with a response.
You begin by defining a command type. Commands specify their input and output
in terms of the types that they expect to see in the request and response
key-value pairs. Here's an example of a command that adds two integers, 'a'
and 'b'::
class Sum(amp.Command):
arguments = [('a', amp.Integer()),
('b', amp.Integer())]
response = [('total', amp.Integer())]
Once you have specified a command, you need to make it part of a protocol, and
define a responder for it. Here's a 'JustSum' protocol that includes a
responder for our 'Sum' command::
class JustSum(amp.AMP):
def sum(self, a, b):
total = a + b
print 'Did a sum: %d + %d = %d' % (a, b, total)
return {'total': total}
Sum.responder(sum)
Later, when you want to actually do a sum, the following expression will return
a L{Deferred} which will fire with the result::
ClientCreator(reactor, amp.AMP).connectTCP(...).addCallback(
lambda p: p.callRemote(Sum, a=13, b=81)).addCallback(
lambda result: result['total'])
Command responders may also return Deferreds, causing the response to be
sent only once the Deferred fires::
class DelayedSum(amp.AMP):
def slowSum(self, a, b):
total = a + b
result = defer.Deferred()
reactor.callLater(3, result.callback, {'total': total})
return result
Sum.responder(slowSum)
This is transparent to the caller.
You can also define the propagation of specific errors in AMP. For example,
for the slightly more complicated case of division, we might have to deal with
division by zero::
class Divide(amp.Command):
arguments = [('numerator', amp.Integer()),
('denominator', amp.Integer())]
response = [('result', amp.Float())]
errors = {ZeroDivisionError: 'ZERO_DIVISION'}
The 'errors' mapping here tells AMP that if a responder to Divide emits a
L{ZeroDivisionError}, then the other side should be informed that an error of
the type 'ZERO_DIVISION' has occurred. Writing a responder which takes
advantage of this is very simple - just raise your exception normally::
class JustDivide(amp.AMP):
def divide(self, numerator, denominator):
result = numerator / denominator
print 'Divided: %d / %d = %d' % (numerator, denominator, total)
return {'result': result}
Divide.responder(divide)
On the client side, the errors mapping will be used to determine what the
'ZERO_DIVISION' error means, and translated into an asynchronous exception,
which can be handled normally as any L{Deferred} would be::
def trapZero(result):
result.trap(ZeroDivisionError)
print "Divided by zero: returning INF"
return 1e1000
ClientCreator(reactor, amp.AMP).connectTCP(...).addCallback(
lambda p: p.callRemote(Divide, numerator=1234,
denominator=0)
).addErrback(trapZero)
For a complete, runnable example of both of these commands, see the files in
the Twisted repository::
doc/core/examples/ampserver.py
doc/core/examples/ampclient.py
On the wire, AMP is a protocol which uses 2-byte lengths to prefix keys and
values, and empty keys to separate messages::
<2-byte length><2-byte length>
<2-byte length><2-byte length>
...
<2-byte length><2-byte length>
# Empty Key == End of Message
And so on. Because it's tedious to refer to lengths and NULs constantly, the
documentation will refer to packets as if they were newline delimited, like
so::
C: _command: sum
C: _ask: ef639e5c892ccb54
C: a: 13
C: b: 81
S: _answer: ef639e5c892ccb54
S: total: 94
Notes:
In general, the order of keys is arbitrary. Specific uses of AMP may impose an
ordering requirement, but unless this is specified explicitly, any ordering may
be generated and any ordering must be accepted. This applies to the
command-related keys I{_command} and I{_ask} as well as any other keys.
Values are limited to the maximum encodable size in a 16-bit length, 65535
bytes.
Keys are limited to the maximum encodable size in a 8-bit length, 255 bytes.
Note that we still use 2-byte lengths to encode keys. This small redundancy
has several features:
- If an implementation becomes confused and starts emitting corrupt data,
or gets keys confused with values, many common errors will be signalled
immediately instead of delivering obviously corrupt packets.
- A single NUL will separate every key, and a double NUL separates
messages. This provides some redundancy when debugging traffic dumps.
- NULs will be present at regular intervals along the protocol, providing
some padding for otherwise braindead C implementations of the protocol,
so that string functions will see the NUL and stop.
- This makes it possible to run an AMP server on a port also used by a
plain-text protocol, and easily distinguish between non-AMP clients (like
web browsers) which issue non-NUL as the first byte, and AMP clients,
which always issue NUL as the first byte.
@var MAX_VALUE_LENGTH: The maximum length of a message.
@type MAX_VALUE_LENGTH: L{int}
@var ASK: Marker for an Ask packet.
@type ASK: L{bytes}
@var ANSWER: Marker for an Answer packet.
@type ANSWER: L{bytes}
@var COMMAND: Marker for a Command packet.
@type COMMAND: L{bytes}
@var ERROR: Marker for an AMP box of error type.
@type ERROR: L{bytes}
@var ERROR_CODE: Marker for an AMP box containing the code of an error.
@type ERROR_CODE: L{bytes}
@var ERROR_DESCRIPTION: Marker for an AMP box containing the description of the
error.
@type ERROR_DESCRIPTION: L{bytes}
N)partial)BytesIO)count)pack)
MethodType)AnyCallableDictListOptionalTupleTypeUnion) Interface implementer)Deferredfail
maybeDeferred)ConnectionClosedConnectionLostPeerVerifyError)IFileDescriptorReceiver)CONNECTION_LOST)Protocol)Int16StringReceiverStatefulStringProtocol)filepathlog)UTCFixedOffsetTimeZone) nativeString)Failure)accumulateClassDict)ssl)DN CertificateCertificateOptionsKeyPair)5AMPANSWERASKAmpBoxAmpErrorAmpListArgumentBadLocalReturnBinaryBoxProtocolBooleanBox
BoxDispatcherCOMMANDCommandCommandLocatorDecimal
DescriptorERROR
ERROR_CODEERROR_DESCRIPTIONFloat
IArgumentType IBoxReceiver
IBoxSenderIResponderLocatorIncompatibleVersionsIntegerInvalidSignatureListOfMAX_KEY_LENGTHMAX_VALUE_LENGTHMalformedAmpBox NoEmptyBoxes
OnlyOneTLSPROTOCOL_ERRORSPYTHON_KEYWORDSPathProtocolSwitchCommandProtocolSwitchedQuitBoxRemoteAmpErrorSimpleStringLocatorStartTLSStringTooLongUNHANDLED_ERROR_CODEUNKNOWN_ERROR_CODEUnhandledCommandutcUnicodeUnknownRemoteErrorparse parseStrings _asks _answers _commands _errors _error_codes _error_descriptions UNKNOWNs UNHANDLED c @ e Zd ZdZdd Zdd ZdS )r= z
An L{IArgumentType} can serialize a Python object into an AMP box and
deserialize information from an AMP box back into a Python object.
@since: 9.0
c C dS )a
Given an argument name and an AMP box containing serialized values,
extract one or more Python objects and add them to the C{objects}
dictionary.
@param name: The name associated with this argument. Most commonly
this is the key which can be used to find a serialized value in
C{strings}.
@type name: C{bytes}
@param strings: The AMP box from which to extract one or more
values.
@type strings: C{dict}
@param objects: The output dictionary to populate with the value for
this argument. The key used will be derived from C{name}. It may
differ; in Python 3, for example, the key will be a Unicode/native
string. See L{_wireNameToPythonIdentifier}.
@type objects: C{dict}
@param proto: The protocol instance which received the AMP box being
interpreted. Most likely this is an instance of L{AMP}, but
this is not guaranteed.
@return: L{None}
N namestringsobjectsprotora ra 7/usr/lib/python3/dist-packages/twisted/protocols/amp.pyfromBox; zIArgumentType.fromBoxc C r` )a=
Given an argument name and a dictionary containing structured Python
objects, serialize values into one or more strings and add them to
the C{strings} dictionary.
@param name: The name associated with this argument. Most commonly
this is the key in C{strings} to associate with a C{bytes} giving
the serialized form of that object.
@type name: C{bytes}
@param strings: The AMP box into which to insert one or more strings.
@type strings: C{dict}
@param objects: The input dictionary from which to extract Python
objects to serialize. The key used will be derived from C{name}.
It may differ; in Python 3, for example, the key will be a
Unicode/native string. See L{_wireNameToPythonIdentifier}.
@type objects: C{dict}
@param proto: The protocol instance which will send the AMP box once
it is fully populated. Most likely this is an instance of
L{AMP}, but this is not guaranteed.
@return: L{None}
Nra rb ra ra rg toBoxW ri zIArgumentType.toBoxN)__name__
__module__ __qualname____doc__rh rj ra ra ra rg r= 3 s r= c @ r_ )r? z7
A transport which can send L{AmpBox} objects.
c C r` )z
Send an L{AmpBox}.
@raise ProtocolSwitched: if the underlying protocol has been
switched.
@raise ConnectionLost: if the underlying connection has already been
lost.
Nra boxra ra rg sendBoxx ri zIBoxSender.sendBoxc C r` )z
An unhandled error occurred in response to a box. Log it
appropriately.
@param failure: a L{Failure} describing the error that occurred.
Nra )failurera ra rg unhandledError ri zIBoxSender.unhandledErrorN)rk rl rm rn rq rs ra ra ra rg r? s s r? c @ ( e Zd ZdZdd Zdd Zdd ZdS ) r> zh
An application object which can receive L{AmpBox} objects and dispatch them
appropriately.
c C r` )z
The L{IBoxReceiver.ampBoxReceived} method will start being called;
boxes may be responded to by responding to the given L{IBoxSender}.
@param boxSender: an L{IBoxSender} provider.
Nra boxSenderra ra rg startReceivingBoxes ri z IBoxReceiver.startReceivingBoxesc C r` )zS
A box was received from the transport; dispatch it appropriately.
Nra ro ra ra rg ampBoxReceived ri zIBoxReceiver.ampBoxReceivedc C r` )zi
No further boxes will be received on this connection.
@type reason: L{Failure}
Nra )reasonra ra rg stopReceivingBoxes ri z IBoxReceiver.stopReceivingBoxesN)rk rl rm rn rw rx rz ra ra ra rg r> s
r> c @ e Zd ZdZdd ZdS )r@ ze
An application object which can look up appropriate responder methods for
AMP commands.
c C r` )a
Locate a responder method appropriate for the named command.
@param name: the wire-level name (commandName) of the AMP command to be
responded to.
@type name: C{bytes}
@return: a 1-argument callable that takes an L{AmpBox} with argument
values for the given command, and returns an L{AmpBox} containing
argument values for the named command, or a L{Deferred} that fires the
same.
Nra )rc ra ra rg locateResponder ri z!IResponderLocator.locateResponderN)rk rl rm rn r| ra ra ra rg r@ r@ c @ e Zd ZdZdS )r, z3
Base class of all Amp-related exceptions.
Nrk rl rm rn ra ra ra rg r, r, c @ r~ )rN z
Connections which have been switched to other protocols can no longer
accept traffic at the AMP level. This is raised when you try to send it.
Nr ra ra ra rg rN r rN c @ r~ )rI z`
This is an implementation limitation; TLS may only be started once per
connection.
Nr ra ra ra rg rI r rI c @ r~ )rH zt
You can't have empty boxes on the connection. This is raised when you
receive or attempt to send one.
Nr ra ra ra rg rH r rH c @ r~ )rC z5
You didn't pass all the required arguments.
Nr ra ra ra rg rC r rC c @ s( e Zd ZdZdddZdefddZdS ) rT a
One of the protocol's length limitations was violated.
@ivar isKey: true if the string being encoded in a key position, false if
it was in a value position.
@ivar isLocal: Was the string encoded locally, or received too long from
the network? (It's only physically possible to encode "too long" values on
the network for keys.)
@ivar value: The string that was too long.
@ivar keyName: If the string being encoded was in a value position, what
key was it being encoded for?
Nc C s& t | || _|| _|| _|| _d S N)r, __init__isKeyisLocalvaluekeyName)selfr r r r ra ra rg r s
zTooLong.__init__returnc C sH | j rdpd}| j s|dt| j 7 }| jrdpd}d||t| jf S )Nkeyr localremotez%s %s too long: %d)r reprr r lenr )r hdrlclra ra rg __repr__ s
zTooLong.__repr__r )rk rl rm rn r strr ra ra ra rg rT s
rT c @ s8 e Zd ZdZdededdfddZdefdd ZeZdS )
r/ zU
A bad value was returned from a local command; we were unable to coerce it.
messageenclosedr Nc C s t | || _|| _d S r )r, r r r )r r r ra ra rg r s
zBadLocalReturn.__init__c C s | j d | j S )Nr )r r getBriefTracebackr ra ra rg r s zBadLocalReturn.__repr__) rk rl rm rn r r! r r __str__ra ra ra rg r/ s
r/ c s" e Zd ZdZd fdd Z ZS )rP z
This error indicates that something went wrong on the remote end of the
connection, and the error was serialized and transmitted to you.
FNc sz |r d}| }nd}d}ddd |D }|r"d||||}nd|||}t | || _|| _|| _|| _dS )a Create a remote error with an error code and description.
@param errorCode: the AMP error code of this error.
@type errorCode: C{bytes}
@param description: some text to show to the user.
@type description: C{str}
@param fatal: a boolean, true if this error should terminate the
connection.
@param local: a local Failure, if one exists.
z (local) c s s, | ]}|d krd|dnt |V qdS ) z\x2xN)chr).0cra ra rg * s
z*RemoteAmpError.__init__..zCode<{}>{}: {}
{}zCode<{}>{}: {}N) r joinformatsuperr r errorCode descriptionfatal) r r r r r localwhatothertberrorCodeForMessager __class__ra rg r s.
zRemoteAmpError.__init__)FN)rk rl rm rn r
__classcell__ra ra r rg rP
s rP c @ r{ )rZ zc
This means that an error whose type we can't identify was raised from the
other side.
c C s t }t| || d S r )rV rP r )r r r ra ra rg r G s zUnknownRemoteError.__init__N)rk rl rm rn r ra ra ra rg rZ A r} rZ c @ r~ )rG zJ
This error indicates that the wire-level protocol was malformed.
Nr ra ra ra rg rG L r rG c @ r~ )rW z=
A command received via amp could not be dispatched.
Nr ra ra ra rg rW R r rW c @ r~ )rA zw
It was impossible to negotiate a compatible version of the protocol with
the other end of the connection.
Nr ra ra ra rg rA X r rA c sX e Zd ZU dZg Zee ed< fddZdd Z dd Z
d d
Z d efd d
Z Z
S )r+ z\
I am a packet in the AMP protocol, much like a
regular bytes:bytes dictionary.
__slots__c sF t j|i | dd | D }|D ]}|d}| || |< qdS )a
Initialize a new L{AmpBox}.
In Python 3, keyword arguments MUST be Unicode/native strings whereas
in Python 2 they could be either byte strings or Unicode strings.
However, all keys of an L{AmpBox} MUST be byte strings, or possible to
transparently coerce into byte strings (i.e. Python 2).
In Python 3, therefore, native string keys are coerced to byte strings
by encoding as ASCII. This can result in C{UnicodeEncodeError} being
raised.
@param args: See C{dict}, but all keys and values should be C{bytes}.
On Python 3, native strings may be used as keys provided they
contain only ASCII characters.
@param kw: See C{dict}, but all keys and values should be C{bytes}.
On Python 3, native strings may be used as keys provided they
contain only ASCII characters.
@raise UnicodeEncodeError: When a native string key cannot be coerced
to an ASCII byte string (Python 3 only).
c S s g | ] }t |ts|qS ra
isinstancebytes)r nra ra rg
z#AmpBox.__init__..asciiN)r r encodepop)r argskw nonByteNames nonByteNamebyteNamer ra rg r l s
zAmpBox.__init__c C s | }|| |S )z5
Return another AmpBox just like me.
)r update)r newBoxra ra rg copy s
z AmpBox.copyc C s t | }g }|j}|D ]N\}}t|tkr td| t|tkr-td|d|t|tkr:tdd|dt|t krGtdd||||fD ]}|t
dt| || qKq
|t
dd d |S )
z
Convert me into a wire-encoded string.
@return: a C{bytes} encoded according to the rules described in the
module docstring.
zUnicode key not allowed: %rzUnicode value for key z not allowed: TNF!Hr ) sorteditemsappendtyper TypeErrorr rE rT rF r r )r iLwkvkvra ra rg serialize s$
zAmpBox.serializec C s | | dS )aW
Serialize and send this box to an Amp instance. By the time it is being
sent, several keys are required. I must have exactly ONE of::
_ask
_answer
_error
If the '_ask' key is set, then the '_command' key must also be
set.
@param proto: an AMP instance.
N)rq r rf ra ra rg _sendTo s zAmpBox._sendTor c C s dt | dS )NzAmpBox())dictr r ra ra rg r zAmpBox.__repr__)rk rl rm rn r r
r __annotations__r r r r r r ra ra r rg r+ b s
r+ c sD e Zd ZU dZg Zee ed< def fdd Z fddZ Z
S )rO zJ
I am an AmpBox that, upon being sent, terminates the connection.
r r c s dt dS )Nz
QuitBox(**r )r r r r ra rg r r zQuitBox.__repr__c s t | |j dS )z@
Immediately call loseConnection after sending.
N)r r transportloseConnectionr r ra rg r s zQuitBox._sendTo) rk rl rm rn r r
r r r r r ra ra r rg rO s
rO c s: e Zd ZdZ fddZdefddZ fddZ ZS )
_SwitchBoxz|
Implementation detail of ProtocolSwitchCommand: I am an AmpBox which sets
up state for the protocol to switch.
c s t jdi | || _dS )z
Create a _SwitchBox with the protocol to switch to after being sent.
@param innerProto: the protocol instance to switch to.
@type innerProto: an IProtocol provider.
Nra )r r
innerProto)r r r r ra rg r s
z_SwitchBox.__init__r c C s d | jt| S )Nz_SwitchBox({!r}, **{}))r r r r r ra ra rg r s z_SwitchBox.__repr__c s$ t | | || j dS )z{
Send me; I am the last box on the connection. All further traffic will be
over the new protocol.
N)r r _lockForSwitch _switchTor r r ra rg r s z_SwitchBox._sendTo) rk rl rm rn r r r r r ra ra r rg r s
r c @ s e Zd ZdZdZdZdZdZdd Zdd Z dd Z
d
d Z d d
Z d#ddZ
d#ddZdd Zdd Zdd Zdd Zdd Zd d Zd d Zd!d" ZdS )$r3 a
A L{BoxDispatcher} dispatches '_ask', '_answer', and '_error' L{AmpBox}es,
both incoming and outgoing, to their appropriate destinations.
Outgoing commands are converted into L{Deferred}s and outgoing boxes, and
associated tracking state to fire those L{Deferred} when '_answer' boxes
come back. Incoming '_answer' and '_error' boxes are converted into
callbacks and errbacks on those L{Deferred}s, respectively.
Incoming '_ask' boxes are converted into method calls on a supplied method
locator.
@ivar _outstandingRequests: a dictionary mapping request IDs to
L{Deferred}s which were returned for those requests.
@ivar locator: an object with a L{CommandLocator.locateResponder} method
that locates a responder function that takes a Box and returns a result
(either a Box or a Deferred which fires one).
@ivar boxSender: an object which can send boxes, via the L{_sendBoxCommand}
method, such as an L{AMP} instance.
@type boxSender: L{IBoxSender}
Nr c C s i | _ || _d S r )_outstandingRequestslocator)r r ra ra rg r s
zBoxDispatcher.__init__c C
|| _ dS )z
The given boxSender is going to start calling boxReceived on this
L{BoxDispatcher}.
@param boxSender: The L{IBoxSender} to send command responses to.
Nru )r rv ra ra rg rw
z!BoxDispatcher.startReceivingBoxesc C s | | dS )z
No further boxes will be received here. Terminate all currently
outstanding command deferreds with the given reason.
N)failAllOutgoingr ry ra ra rg rz % s z BoxDispatcher.stopReceivingBoxesc C s2 || _ | j }d| _|D ] \}}|| q
dS )z
Call the errback on all outstanding requests awaiting responses.
@param reason: the Failure instance to pass to those errbacks.
N)_failAllReasonr r errback)r ry ORr r ra ra rg r , s
z BoxDispatcher.failAllOutgoingc C s | j d7 _ d| j f S )z
Generate protocol-local serial numbers for _ask keys.
@return: a string that has not yet been used on this connection.
s %x)_counterr ra ra rg _nextTag8 s zBoxDispatcher._nextTagTc C sd | j dur|r t| j S dS ||t< | }|r ||t< || j |r.t }| j|< |S d}|S )a
Send a command across the wire with the given C{amp.Box}.
Mutate the given box to give it any additional keys (_command, _ask)
required for the command and request/response machinery, then send it.
If requiresAnswer is True, returns a C{Deferred} which fires when a
response is received. The C{Deferred} is fired with an C{amp.Box} on
success, or with an C{amp.RemoteAmpError} if an error is received.
If the Deferred fails and the error is not handled by the caller of
this method, the failure will be logged and the connection dropped.
@param command: a C{bytes}, the name of the command to issue.
@param box: an AmpBox with the arguments for the command.
@param requiresAnswer: a boolean. Defaults to True. If True, return a
Deferred which will fire when the other side responds to this command.
If False, return None and do not ask the other side for acknowledgement.
@return: a Deferred which fires the AmpBox that holds the response to
this command, or None, as specified by requiresAnswer.
@raise ProtocolSwitched: if the protocol has been switched.
N) r r r4 r r* r rv r r )r commandrp requiresAnswertagresultra ra rg _sendBoxCommandA s
z BoxDispatcher._sendBoxCommandc K s t |}| |||S )at
This is a low-level API, designed only for optimizing simple messages
for which the overhead of parsing is too great.
@param command: a C{bytes} naming the command.
@param kw: arguments to the amp box.
@param requiresAnswer: a boolean. Defaults to True. If True, return a
Deferred which will fire when the other side responds to this command.
If False, return None and do not ask the other side for acknowledgement.
@return: a Deferred which fires the AmpBox that holds the response to
this command, or None, as specified by requiresAnswer.
)r2 r )r r r r rp ra ra rg callRemoteStringl s z BoxDispatcher.callRemoteStringc O s6 z ||i |}W n t y t Y S w || S )ah
This is the primary high-level API for sending messages via AMP. Invoke it
with a command and appropriate arguments to send a message to this
connection's peer.
@param commandType: a subclass of Command.
@type commandType: L{type}
@param a: Positional (special) parameters taken by the command.
Positional parameters will typically not be sent over the wire. The
only command included with AMP which uses positional parameters is
L{ProtocolSwitchCommand}, which takes the protocol that will be
switched to as its first argument.
@param kw: Keyword arguments taken by the command. These are the
arguments declared in the command's 'arguments' attribute. They will
be encoded and sent to the peer as arguments for the L{commandType}.
@return: If L{commandType} has a C{requiresAnswer} attribute set to
L{False}, then return L{None}. Otherwise, return a L{Deferred} which
fires with a dictionary of objects representing the result of this
call. Additionally, this L{Deferred} may fail with an exception
representing a connection failure, with L{UnknownRemoteError} if the
other end of the connection fails for an unknown reason, or with any
error specified as a key in L{commandType}'s C{errors} dictionary.
)
BaseExceptionr
_doCommand)r commandTypear cora ra rg
callRemote s %
zBoxDispatcher.callRemotec C s | j |S )zy
This is a terminal callback called after application code has had a
chance to quash any errors.
)rv rs r rr ra ra rg rs s z BoxDispatcher.unhandledErrorc C s* | j |t }|| j || dS )z
An AMP box was received that answered a command previously sent with
L{callRemote}.
@param box: an AmpBox with a value for its L{ANSWER} key.
N)r r r)
addErrbackrs callback)r rp questionra ra rg _answerReceived s z BoxDispatcher._answerReceivedc C sv | j |t }|| j |t }|t }t|tr!| dd}|t
v r-t
| ||}nt ||}| t
| dS )z
An AMP box was received that answered a command previously sent with
L{callRemote}, with an error.
@param box: an L{AmpBox} with a value for its L{ERROR}, L{ERROR_CODE},
and L{ERROR_DESCRIPTION} keys.
utf-8replaceN)r r r9 r rs r: r; r r decoderJ rP r r! )r rp r r r excra ra rg _errorReceived s
z BoxDispatcher._errorReceivedc sR fdd} fdd}| }t v r!||| || j || j dS )zc
@param box: an L{AmpBox} with a value for its L{COMMAND} and L{ASK}
keys.
c s t | t< | S r )r* r) ) answerBoxro ra rg formatAnswer s z4BoxDispatcher._commandReceived..formatAnswerc s | tr$| jj}| jj}t|tr|dd}| jjr t }nt
}n t }t | t
}d} t |t< ||t< ||t< |S )Nr r s
Unknown Error)checkrP r r r r r r r rO r+ r errrV r* r9 r; r: )errorcodedescerrorBoxro ra rg formatError s
z3BoxDispatcher._commandReceived..formatErrorN)dispatchCommandr* addCallbacks addCallback _safeEmitr rs )r rp r r deferredra ro rg _commandReceived s
z BoxDispatcher._commandReceivedc C sJ t |v r | | dS t|v r| | dS t|v r!| | dS t|)a
An AmpBox was received, representing a command, or an answer to a
previously issued command (either successful or erroneous). Respond to
it according to its contents.
@param box: an AmpBox
@raise NoEmptyBoxes: when a box is received that does not contain an
'_answer', '_command' / '_ask', or '_error' key; i.e. one which does not
fit into the command / response protocol defined by AMP.
N)r) r r9 r r4 r rH r rp ra ra rg rx s z BoxDispatcher.ampBoxReceivedc C s, z | | j W dS ttfy Y dS w )z
Emit a box, ignoring L{ProtocolSwitched} and L{ConnectionLost} errors
which cannot be usefully handled.
N)r rv rN r )r aBoxra ra rg r
s
zBoxDispatcher._safeEmitc C sJ |t }| j|}|du r d|}ttt|dtt dS t||S )z
A box with a _command key was received.
Dispatch it to a local handler call it.
@param box: an AmpBox to be dispatched.
NzUnhandled Command: Fr ) r4 r r| r rP rU r! rW r )r rp cmd responderr ra ra rg r s
z BoxDispatcher.dispatchCommand)T)rk rl rm rn r r r rv r rw rz r r r r r rs r r r rx r r ra ra ra rg r3 s*
++ %
r3 c @ s& e Zd ZU dZg Zded< dd ZdS )_CommandLocatorMetaa
This metaclass keeps track of all of the Command.responder-decorated
methods defined since the last CommandLocator subclass was defined. It
assumes (usually correctly, but unfortunately not necessarily so) that
those commands responders were all declared as methods of the class
being defined. Note that this list can be incorrect if users use the
Command.responder decorator outside the context of a CommandLocator
class declaration.
Command responders defined on subclasses are given precedence over
those inherited from a base class.
The Command.responder decorator explicitly cooperates with this
metaclass.
z List[Tuple[Command, Callable]]_currentClassCommandsc C s | j d d }g | j d d < i }|d< t| |||}t|jdd }| |D ] }|t|di q+|D ] \} }
| |
f|| j< q9|rT|j t
j krTdd } | |_ |S )N_commandDispatchr c S s t jdtdd | |S )Nz-Override locateResponder, not lookupFunction. category
stacklevel)warningswarnPendingDeprecationWarninglookupFunctionr rc ra ra rg r| K s
z4_CommandLocatorMeta.__new__..locateResponder) r r __new__list__mro__reverser getattr commandNamer r6 r| ) clsrc basesattrscommandscdsubcls ancestorsancestor commandClass
responderFuncr| ra ra rg r > s z_CommandLocatorMeta.__new__N)rk rl rm rn r r r ra ra ra rg r
+ s
r
c @ rt ) r6 z
A L{CommandLocator} is a collection of responders to AMP L{Command}s, with
the help of the L{Command.responder} decorator.
c s fdd}|S )a<
Wrap aCallable with its command's argument de-serialization
and result serialization logic.
@param aCallable: a callable with a 'command' attribute, designed to be
called with keyword arguments.
@param command: the command class whose serialization to use.
@return: a 1-arg callable which, when invoked with an AmpBox, will
deserialize the argument list and invoke appropriate user code for the
callable's command, returning a Deferred which fires with the result or
fails with an error.
c sD | }fdd} fdd}t fi |||S )Nc s: | j j } j| }t| j}tt||| jv | dS )Nr
)trap allErrorsr r r! rP fatalErrors)r r r r )r ra rg checkKnownErrorsq s
zMCommandLocator._wrapWithSerialization..doit..checkKnownErrorsc s8 z | W S ty t }td | f |w )Nz,%r returned %r and %r could not serialize it) makeResponser r! r/ )re originalFailure aCallabler r ra rg makeResponseFory s zLCommandLocator._wrapWithSerialization..doit..makeResponseFor)parseArgumentsr r r )rp r r, r1 r/ ra rg doitn s
z3CommandLocator._wrapWithSerialization..doitra )r r0 r r3 ra r/ rg _wrapWithSerialization^ s z%CommandLocator._wrapWithSerializationc C s4 | j jtjkr
t| |S tjdtdd | |S )zJ
Deprecated synonym for L{CommandLocator.locateResponder}
z)Call locateResponder, not lookupFunction.r r )r r r6 r| r r r r ra ra rg r s
z CommandLocator.lookupFunctionc C s4 | j }||v r|| \}}t|| }| ||S dS )a
Locate a callable to invoke when executing the named command.
@param name: the normalized name (from the wire) of the command.
@type name: C{bytes}
@return: a 1-argument function that takes a Box and returns a box or a
Deferred which fires a Box, for handling the command identified by the
given name, or None, if no appropriate responder can be found.
N)r r r4 )r rc r# r' r( responderMethodra ra rg r| s
z CommandLocator.locateResponderN)rk rl rm rn r4 r r| ra ra ra rg r6 W s
/ r6 ) metaclassc @ s e Zd ZdZdZdd ZdS )rQ z^
Implement the L{AMP.locateResponder} method to do simple, string-based
dispatch.
s amp_c C s t | j| }t| |dS )a
Locate a callable to invoke when executing the named command.
@return: a function with the name C{"amp_" + name} on the same
instance, or None if no such function exists.
This function will then be called with the L{AmpBox} itself as an
argument.
@param name: the normalized name (from the wire) of the command.
@type name: C{bytes}
N)r baseDispatchPrefixupperr )r rc fNamera ra rg r| s z#SimpleStringLocator.locateResponderN)rk rl rm rn r7 r| ra ra ra rg rQ s rQ ) anddelforisraiseasserteliffromlambdar breakelseglobalnottryclassexceptiforwhilecontinueexecimportpassyielddeffinallyinprintc C s$ t | dd}|tv r| S |S )a|
(Private) Normalize an argument name from the wire for use with Python
code. If the return value is going to be a python keyword it will be
capitalized. If it contains any dashes they will be replaced with
underscores.
The rationale behind this method is that AMP should be an inherently
multi-language protocol, so message keys may contain all manner of bizarre
bytes. This is not a complete solution; there are still forms of arguments
that this implementation will be unable to parse. However, Python
identifiers share a huge raft of properties with identifiers from many
other languages, so this is a 'good enough' effort for now. We deal
explicitly with dashes because that is the most likely departure: Lisps
commonly use dashes to separate method names, so protocols initially
implemented in a lisp amp dialect may use dashes in argument or command
names.
@param key: a C{bytes}, looking something like 'foo-bar-baz' or 'from'
@type key: C{bytes}
@return: a native string which is a valid python identifier, looking
something like 'foo_bar_baz' or 'From'.
- _)r r rK title)r lkeyra ra rg _wireNameToPythonIdentifier s rZ c @ sV e Zd ZdZdZdddZdd Zdd Zd d
Zd d Z d
d Z
dd Z dd Z dS )r. a
Base-class of all objects that take values from Amp packets and convert
them into objects for Python functions.
This implementation of L{IArgumentType} provides several higher-level
hooks for subclasses to override. See L{toString} and L{fromString}
which will be used to define the behavior of L{IArgumentType.toBox} and
L{IArgumentType.fromBox}, respectively.
Fc C r )z
Create an Argument.
@param optional: a boolean indicating whether this argument can be
omitted in the protocol.
Noptional)r r\ ra ra rg r r zArgument.__init__c C s0 | j r||}|dur||= |S ||}|S )a/
Retrieve the given key from the given dictionary, removing it if found.
@param d: a dictionary.
@param name: a key in I{d}.
@param proto: an instance of an AMP.
@raise KeyError: if I am not optional and no value was found.
@return: d[name].
N)r\ getr )r drc rf r ra ra rg retrieve s
zArgument.retrievec C sD | |||}t|}| jr|du rd||< dS | ||||< dS )aG
Populate an 'out' dictionary with mapping names to Python values
decoded from an 'in' AmpBox mapping strings to string values.
@param name: the argument name to retrieve
@type name: C{bytes}
@param strings: The AmpBox to read string(s) from, a mapping of
argument names to string values.
@type strings: AmpBox
@param objects: The dictionary to write object(s) to, a mapping of
names to Python objects. Keys will be native strings.
@type objects: dict
@param proto: an AMP instance.
N)r_ rZ r\ fromStringProto)r rc rd re rf stnkra ra rg rh 4 s
zArgument.fromBoxc C s8 | |t||}| jr|du rdS | ||||< dS )a]
Populate an 'out' AmpBox with strings encoded from an 'in' dictionary
mapping names to Python values.
@param name: the argument name to retrieve
@type name: C{bytes}
@param strings: The AmpBox to write string(s) to, a mapping of
argument names to string values.
@type strings: AmpBox
@param objects: The dictionary to read object(s) from, a mapping of
names to Python objects. Keys should be native strings.
@type objects: dict
@param proto: the protocol we are converting for.
@type proto: AMP
N)r_ rZ r\
toStringProto)r rc rd re rf objra ra rg rj M s zArgument.toBoxc C
| |S )z
Convert a string to a Python value.
@param inString: the string to convert.
@type inString: C{bytes}
@param proto: the protocol we are converting for.
@type proto: AMP
@return: a Python object.
)
fromStringr inStringrf ra ra rg r` h s
zArgument.fromStringProtoc C re )z
Convert a Python object to a string.
@param inObject: the object to convert.
@param proto: the protocol we are converting for.
@type proto: AMP
)toStringr inObjectrf ra ra rg rc v s
zArgument.toStringProtoc C r` )z
Convert a string to a Python object. Subclasses must implement this.
@param inString: the string to convert.
@type inString: C{bytes}
@return: the decoded value from C{inString}
Nra r rh ra ra rg rf ri zArgument.fromStringc C r` )a
Convert a Python object into a string for passing over the network.
@param inObject: an object of the type that this Argument is intended
to deal with.
@return: the wire encoding of inObject
@rtype: C{bytes}
Nra r rk ra ra rg ri ri zArgument.toStringNF)
rk rl rm rn r\ r r_ rh rj r` rc rf ri ra ra ra rg r. s
r. c @ e Zd ZdZeZdd ZdS )rB z
Encode any integer values of any size on the wire as the string
representation.
Example: C{123} becomes C{"123"}
c C s
d|f S )Ns %dra rm ra ra rg ri
zInteger.toStringN)rk rl rm rn intrf ri ra ra ra rg rB s rB c @ r_ )rS zB
Don't do any conversion at all; just pass through 'str'.
c C |S r ra rm ra ra rg ri zString.toStringc C rr r ra rl ra ra rg rf rs zString.fromStringNrk rl rm rn ri rf ra ra ra rg rS rS c @ ro )r< zA
Encode floating-point values on the wire as their repr.
c C s& t |ts td|t|dS )NzBad float value r )r float
ValueErrorr r rl ra ra rg ri s
zFloat.toStringN)rk rl rm rn rv rf ri ra ra ra rg r< s r< c @ r_ )r1 z@
Encode True or False as "True" or "False" on the wire.
c C s& |dkrdS |dkr dS t d|)N TrueT FalseFzBad boolean value: )r rl ra ra rg rf s
zBoolean.fromStringc C s |rdS dS )Nrx ry ra rm ra ra rg ri s zBoolean.toStringNrk rl rm rn rf ri ra ra ra rg r1 s r1 c @ r_ )rY z7
Encode a unicode string on the wire as UTF-8.
c C s t | |dS Nr )rS ri r rm ra ra rg ri r zUnicode.toStringc C s t | |dS r{ )rS rf r rl ra ra rg rf r zUnicode.fromStringNrt ra ra ra rg rY ru rY c @ r_ )rL aY
Encode and decode L{filepath.FilePath} instances as paths on the wire.
This is really intended for use with subprocess communication tools:
exchanging pathnames on different machines over a network is not generally
meaningful, but neither is it disallowed; you can use this to communicate
about NFS paths, for example.
c C s t t| |S r )r FilePathrY rf rl ra ra rg rf r zPath.fromStringc C s t | | jS r )rY ri
asTextModepathrm ra ra rg ri r z
Path.toStringNrz ra ra ra rg rL s rL c @ * e Zd ZdZd
ddZdd Zdd Zd S ) rD a
Encode and decode lists of instances of a single other argument type.
For example, if you want to pass::
[3, 7, 9, 15]
You can create an argument like this::
ListOf(Integer())
The serialized form of the entire list is subject to the limit imposed by
L{MAX_VALUE_LENGTH}. List elements are represented as 16-bit length
prefixed strings. The argument type passed to the L{ListOf} initializer is
responsible for producing the serialized form of each element.
@ivar elementType: The L{Argument} instance used to encode and decode list
elements (note, not an arbitrary L{IArgumentType} implementation:
arguments must be implemented using only the C{fromString} and
C{toString} methods, not the C{fromBox} and C{toBox} methods).
@param optional: a boolean indicating whether this argument can be
omitted in the protocol.
@since: 10.0
Fc C s || _ t| | d S r ) elementTyper. r )r r r\ ra ra rg r s zListOf.__init__c s6 g }t }|j|_|| | jj fdd|D S )zn
Convert the serialized form of a list of instances of some type back
into that list.
c s g | ]} |qS ra ra )r stringelementFromStringra rg r s z%ListOf.fromString..)r r stringReceived dataReceivedr rf )r rh rd parserra r rg rf s
zListOf.fromStringc C sB g }|D ]}| j |}|tdt| || qd|S )zI
Serialize the given list of objects to a single string.
r r )r ri r r r r )r rk rd rd
serializedra ra rg ri s
zListOf.toStringNrn )rk rl rm rn r rf ri ra ra ra rg rD s
rD c @ r ) r- aI
Convert a list of dictionaries into a list of AMP boxes on the wire.
For example, if you want to pass::
[{'a': 7, 'b': u'hello'}, {'a': 9, 'b': u'goodbye'}]
You might use an AmpList like this in your arguments or response list::
AmpList([('a', Integer()),
('b', Unicode())])
Fc C s6 t dd |D sJ d|f || _t| | dS )ag
Create an AmpList.
@param subargs: a list of 2-tuples of ('name', argument) describing the
schema of the dictionaries in the sequence of amp boxes.
@type subargs: A C{list} of (C{bytes}, L{Argument}) tuples.
@param optional: a boolean indicating whether this argument can be
omitted in the protocol.
c s s | ]
\}}t |tV qd S r r )r rc _ra ra rg r @ s z#AmpList.__init__..zgAmpList should be defined with a list of (name, argument) tuples where `name' is a byte string, got: %rN)allsubargsr. r )r r r\ ra ra rg r 5 s zAmpList.__init__c s t |} fdd|D }|S )Nc s g | ] }t |j qS ra )_stringsToObjectsr )r rp rf r ra rg r I r z+AmpList.fromStringProto..)r\ )r rh rf boxesvaluesra r rg r` G s zAmpList.fromStringProtoc s d fdd|D S )Nr c s" g | ]
}t |jt qS ra )_objectsToStringsr r2 r )r re r ra rg r N s z)AmpList.toStringProto..)r rj ra r rg rc L s
zAmpList.toStringProtoNrn )rk rl rm rn r r` rc ra ra ra rg r- ' s
r- c @ r_ )r8 aO
Encode and decode file descriptors for exchange over a UNIX domain socket.
This argument type requires an AMP connection set up over an
L{IUNIXTransport} provider (for
example, the kind of connection created by
L{IReactorUNIX.connectUNIX}
and L{UNIXClientEndpoint}).
There is no correspondence between the integer value of the file descriptor
on the sending and receiving sides, therefore an alternate approach is taken
to matching up received descriptors with particular L{Descriptor}
parameters. The argument is encoded to an ordinal (unique per connection)
for inclusion in the AMP command or response box. The descriptor itself is
sent using
L{IUNIXTransport.sendFileDescriptor}.
The receiver uses the order in which file descriptors are received and the
ordinal value to come up with the received copy of the descriptor.
c C s | t|S )a
Take a unique identifier associated with a file descriptor which must
have been received by now and use it to look up that descriptor in a
dictionary where they are kept.
@param inString: The base representation (as a byte string) of an
ordinal indicating which file descriptor corresponds to this usage
of this argument.
@type inString: C{str}
@param proto: The protocol used to receive this descriptor. This
protocol must be connected via a transport providing
L{IUNIXTransport}.
@type proto: L{BinaryBoxProtocol}
@return: The file descriptor represented by C{inString}.
@rtype: C{int}
)_getDescriptorrq rg ra ra rg r` j s zDescriptor.fromStringProtoc C s | |}t| ||}|S )a
Send C{inObject}, an integer file descriptor, over C{proto}'s connection
and return a unique identifier which will allow the receiver to
associate the file descriptor with this argument.
@param inObject: A file descriptor to duplicate over an AMP connection
as the value for this argument.
@type inObject: C{int}
@param proto: The protocol which will be used to send this descriptor.
This protocol must be connected via a transport providing
L{IUNIXTransport}.
@return: A byte string which can be used by the receiver to reconstruct
the file descriptor.
@rtype: C{bytes}
)_sendFileDescriptorrB rc )r rk rf
identifier outStringra ra rg rc s
zDescriptor.toStringProtoN)rk rl rm rn r` rc ra ra ra rg r8 U s r8 c @ r{ ) _CommandMetazh
Metaclass hack to establish reverse-mappings for 'errors' and
'fatalErrors' as class vars.
c C s i }|d< i }|d< d|vr| d|d< t| |||}t|jts-td|j|jD ]\}}t|ts@td|q0|j D ]\}}t|tsTtd|qDi }i } t
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reverseErrorsr* r r z-Command names must be byte strings, got: {!r}z*Argument names must be byte strings, got: z*Response names must be byte strings, got: errorsr+ z'Error names must be byte strings, got: z-Fatal error names must be byte strings, got: )r r r r r r r r argumentsresponser" r r r+ r ) r rc r r! r ernewtyper r r+ r r ra ra rg r sX
z_CommandMeta.__new__N)rk rl rm rn r ra ra ra rg r r} r c @ s e Zd ZU dZg Zeeeef e d< g Z
eeeef e d< g Z ee e d< i Z
eee ef e d< i Zeee ef e d< eZde d< eZee e d < d
Zd d Zed
d Zedd Zedd Zedd Z edd Z dd Z dS )r5 a
Subclass me to specify an AMP Command.
@cvar arguments: A list of 2-tuples of (name, Argument-subclass-instance),
specifying the names and values of the parameters which are required for
this command.
@cvar response: A list like L{arguments}, but instead used for the return
value.
@cvar errors: A mapping of subclasses of L{Exception} to wire-protocol tags
for errors represented as L{str}s. Responders which raise keys from
this dictionary will have the error translated to the corresponding tag
on the wire.
Invokers which receive Deferreds from invoking this command with
L{BoxDispatcher.callRemote} will potentially receive Failures with keys
from this mapping as their value.
This mapping is inherited; if you declare a command which handles
C{FooError} as 'FOO_ERROR', then subclass it and specify C{BarError} as
'BAR_ERROR', responders to the subclass may raise either C{FooError} or
C{BarError}, and invokers must be able to deal with either of those
exceptions.
@cvar fatalErrors: like 'errors', but errors in this list will always
terminate the connection, despite being of a recognizable error type.
@cvar commandType: The type of Box used to issue commands; useful only for
protocol-modifying behavior like startTLS or protocol switching. Defaults
to a plain vanilla L{Box}.
@cvar responseType: The type of Box used to respond to this command; only
useful for protocol-modifying behavior like startTLS or protocol switching.
Defaults to a plain vanilla L{Box}.
@ivar requiresAnswer: a boolean; defaults to True. Set it to False on your
subclass if you want callRemote to return None. Note: this is a hint only
to the client side of the protocol. The return-type of a command responder
method must always be a dictionary adhering to the contract specified by
L{response}, because clients are always free to request a response if they
want one.
r r extrar r+ z Union[Type[Command], Type[Box]]r responseTypeTc K s` || _ g }| jD ]\}}t|}|| j vr |js || q|r,tdd|| jg }dS )a5
Create an instance of this command with specified values for its
parameters.
In Python 3, keyword arguments MUST be Unicode/native strings whereas
in Python 2 they could be either byte strings or Unicode strings.
A L{Command}'s arguments are defined in its schema using C{bytes}
names. The values for those arguments are plucked from the keyword
arguments using the name returned from L{_wireNameToPythonIdentifier}.
In other words, keyword arguments should be named using the
Python-side equivalent of the on-wire (C{bytes}) name.
@param kw: a dict containing an appropriate value for each name
specified in the L{arguments} attribute of my class.
@raise InvalidSignature: if you forgot any required arguments.
zforgot {} for {}z, N)
structuredr rZ r\ r rC r r r )r r forgottenrc arg
pythonNamera ra rg r s
zCommand.__init__c C s6 z| }W n ty t Y S w t|| j||S )a`
Serialize a mapping of arguments using this L{Command}'s
response schema.
@param objects: a dict with keys matching the names specified in
self.response, having values of the types that the Argument objects in
self.response can format.
@param proto: an L{AMP}.
@return: an L{AmpBox}.
)r r r r r )r re rf r ra ra rg r- " s
zCommand.makeResponsec C sX t }| jD ] \}}|t| q|D ]
}||vr!t| dqt|| j| |S )a
Serialize a mapping of arguments using this L{Command}'s
argument schema.
@param objects: a dict with keys similar to the names specified in
self.arguments, having values of the types that the Argument objects in
self.arguments can parse.
@param proto: an L{AMP}.
@return: An instance of this L{Command}'s C{commandType}.
z is not a valid argument)setr addrZ rC r r )r re rf allowedNamesargNameignored intendedArgra ra rg
makeArguments6 s zCommand.makeArgumentsc C t || j|S )aZ
Parse a mapping of serialized arguments using this
L{Command}'s response schema.
@param box: A mapping of response-argument names to the
serialized forms of those arguments.
@param protocol: The L{AMP} protocol.
@return: A mapping of response-argument names to the parsed
forms.
)r r r rp protocolra ra rg
parseResponseM s
zCommand.parseResponsec C r )a?
Parse a mapping of serialized arguments using this
L{Command}'s argument schema.
@param box: A mapping of argument names to the seralized forms
of those arguments.
@param protocol: The L{AMP} protocol.
@return: A mapping of argument names to the parsed forms.
)r r r ra ra rg r2 \ s zCommand.parseArgumentsc C s t j| |f |S )a
Declare a method to be a responder for a particular command.
This is a decorator.
Use like so::
class MyCommand(Command):
arguments = [('a', ...), ('b', ...)]
class MyProto(AMP):
def myFunMethod(self, a, b):
...
MyCommand.responder(myFunMethod)
Notes: Although decorator syntax is not used within Twisted, this
function returns its argument and is therefore safe to use with
decorator syntax.
This is not thread safe. Don't declare AMP subclasses in other
threads. Don't declare responders outside the scope of AMP subclasses;
the behavior is undefined.
@param methodfunc: A function which will later become a method, which
has a keyword signature compatible with this command's L{arguments} list
and returns a dictionary with a set of keys compatible with this
command's L{response} list.
@return: the methodfunc parameter.
)r6 r r )r
methodfuncra ra rg r j s zCommand.responderc sJ fdd}| j j| j} jr#| j| || |S )aL
Encode and send this Command to the given protocol.
@param proto: an AMP, representing the connection to send to.
@return: a Deferred which will fire or error appropriately when the
other side responds to the command (or error if the connection is lost
before it is responded to).
c s. | t | j} j|jt}t||jS r ) r) rP r r r] r rZ r! r )r rje errorTyper ra rg
_massageError s
z)Command._doCommand.._massageError)r r r r r r r r )r rf r r^ ra r rg r s
zCommand._doCommandN) rk rl rm rn r r
r r r. r r r r r r r
Exceptionr+ r2 r r r+ r r classmethodr- r r r2 r r ra ra ra rg r5 s,
*
#r5 c @ r_ )_NoCertificatea
This is for peers which don't want to use a local certificate. Used by
AMP because AMP's internal language is all about certificates and this
duck-types in the appropriate place; this API isn't really stable though,
so it's not exposed anywhere public.
For clients, it will use ephemeral DH keys, or whatever the default is for
certificate-less clients in OpenSSL. For servers, it will generate a
temporary self-signed certificate with garbage values in the DN and use
that.
c C r )aT
Create a _NoCertificate which either is or isn't for the client side of
the connection.
@param client: True if we are a client and should truly have no
certificate and be anonymous, False if we are a server and actually
have to generate a temporary certificate.
@type client: bool
N)client)r r ra ra rg r s
z_NoCertificate.__init__c G s | j s%tdd}t }||}|||dd d}||}|j| S t }|r9| tdddd |D d t
d i |}|S ) zT
Behaves like L{twisted.internet.ssl.PrivateCertificate.options}().
zTEMPORARY CERTIFICATE)CNc S r` NTra )dnra ra rg ri z(_NoCertificate.options..r Tc S s g | ]}|j qS ra )original)r authra ra rg r s z*_NoCertificate.options..)verifyrequireCertificatecaCertsNra ) r r$ r' generatecertificateRequestsignCertificateRequestnewCertificateoptionsr r r& ) r authoritiessharedDNr crsscrdcertr occora ra rg r s$
z_NoCertificate.optionsN)rk rl rm rn r r ra ra ra rg r s
r c @ sJ e Zd ZU dZg Zee ed< dd Ze dd Z
e dd Z d d
Z d S ) _TLSBoxzK
I am an AmpBox that, upon being sent, initiates a TLS connection.
r c C s t d u r tddt| d S )Ns TLS_ERRORzTLS not available)r# rP r+ r r ra ra rg r s
z_TLSBox.__init__c C s | dtdS )N tls_localCertificateF)r] r r ra ra rg certificate s z_TLSBox.certificatec C s | dd S )N tls_verifyAuthorities)r] r ra ra rg r s z_TLSBox.verifyc C s< t | }dD ]}||d q|| || j| j dS )zK
Send my encoded value to the protocol, then initiate TLS.
)r r N)r+ r r _startTLSr r )r rf abr ra ra rg r s
z_TLSBox._sendToN)
rk rl rm rn r r
r r r propertyr r r ra ra ra rg r s
r c @ r{ )_LocalArgumentz
Local arguments are never actually relayed across the wire. This is just a
shim so that StartTLS can pretend to have some arguments: if arguments
acquire documentation properties, replace this with something nicer later.
c C s d S r ra )r rc rd re rf ra ra rg rh
rs z_LocalArgument.fromBoxN)rk rl rm rn rh ra ra ra rg r s r c @ sd e Zd ZdZdeddfdeddfgZdeddfdeddfgZeZddddd Z d
d Z
dS ) rR az
Use, or subclass, me to implement a command that starts TLS.
Callers of StartTLS may pass several special arguments, which affect the
TLS negotiation:
- tls_localCertificate: This is a
twisted.internet.ssl.PrivateCertificate which will be used to secure
the side of the connection it is returned on.
- tls_verifyAuthorities: This is a list of
twisted.internet.ssl.Certificate objects that will be used as the
certificate authorities to verify our peer's certificate.
Each of those special parameters may also be present as a key in the
response dictionary.
r Tr[ r N)tls_localCertificatetls_verifyAuthoritiesc K sB t du rtd|du rtdn|| _|| _tj| fi | dS )a
Create a StartTLS command. (This is private. Use AMP.callRemote.)
@param tls_localCertificate: the PrivateCertificate object to use to
secure the connection. If it's L{None}, or unspecified, an ephemeral DH
key is used instead.
@param tls_verifyAuthorities: a list of Certificate objects which
represent root certificates to verify our peer with.
NzTLS not available.T)r# RuntimeErrorr r r r5 r )r r r r ra ra rg r - s zStartTLS.__init__c s8 t } jj fdd}|| |S )z
When a StartTLS command is sent, prepare to start TLS, but don't actually
do it; wait for the acknowledgement, then initiate the TLS handshake.
c s jj | S r )r r r )r r ra rg
actuallystartK s z*StartTLS._doCommand..actuallystart)r5 r _prepareTLSr r r )r rf r^ r ra r rg r B s
zStartTLS._doCommand) rk rl rm rn r r r r r r r ra ra ra rg rR s rR c s8 e Zd ZdZ fddZedd Z fddZ ZS )rM a
Use this command to switch from something Amp-derived to a different
protocol mid-connection. This can be useful to use amp as the
connection-startup negotiation phase. Since TLS is a different layer
entirely, you can use Amp to negotiate the security parameters of your
connection, then switch to a different protocol, and the connection will
remain secured.
c s || _ t jdi | dS )a
Create a ProtocolSwitchCommand.
@param _protoToSwitchToFactory: a ProtocolFactory which will generate
the Protocol to switch to.
@param kw: Keyword arguments, encoded and handled normally as
L{Command} would.
Nra )protoToSwitchToFactoryr r )r _protoToSwitchToFactoryr r ra rg r ] s z ProtocolSwitchCommand.__init__c C s t |S r )r )r r rf ra ra rg r- k s z"ProtocolSwitchCommand.makeResponsec s< t } fdd} fdd}|||S )z
When we emit a ProtocolSwitchCommand, lock the protocol, but don't actually
switch to the new protocol unless an acknowledgement is received. If
an error is received, switch back.
c s$ j j } |j | S r )r
buildProtocolr getPeerr )ignr r ra rg switchNowx s
z3ProtocolSwitchCommand._doCommand..switchNowc s jd tt | S r )_unlockFromSwitchr clientConnectionFailedr! r )r r ra rg handle s
z0ProtocolSwitchCommand._doCommand..handle)r r r r )r rf r^ r r r r rg r o s
z ProtocolSwitchCommand._doCommand) rk rl rm rn r r r- r r ra ra r rg rM S s
rM c @ rt ) _DescriptorExchangera
L{_DescriptorExchanger} is a mixin for L{BinaryBoxProtocol} which adds
support for receiving file descriptors, a feature offered by
L{IUNIXTransport}.
@ivar _descriptors: Temporary storage for all file descriptors received.
Values in this dictionary are the file descriptors (as integers). Keys
in this dictionary are ordinals giving the order in which each
descriptor was received. The ordering information is used to allow
L{Descriptor} to determine which is the correct descriptor for any
particular usage of that argument type.
@type _descriptors: C{dict}
@ivar _sendingDescriptorCounter: A no-argument callable which returns the
ordinals, starting from 0. This is used to construct values for
C{_sendFileDescriptor}.
@ivar _receivingDescriptorCounter: A no-argument callable which returns the
ordinals, starting from 0. This is used to construct values for
C{fileDescriptorReceived}.
c C s0 i | _ | j j| _ttt | _ttt | _d S r ) _descriptorsr r r nextr _sendingDescriptorCounter_receivingDescriptorCounterr ra ra rg r s
z _DescriptorExchanger.__init__c C s | j | | S )z
Assign and return the next ordinal to the given descriptor after sending
the descriptor over this protocol's transport.
)r sendFileDescriptorr r
descriptorra ra rg r s z(_DescriptorExchanger._sendFileDescriptorc C s || j | < dS )z
Collect received file descriptors to be claimed later by L{Descriptor}.
@param descriptor: The received file descriptor.
@type descriptor: C{int}
N)r r r ra ra rg fileDescriptorReceived s z+_DescriptorExchanger.fileDescriptorReceivedN)rk rl rm rn r r r ra ra ra rg r s
r c @ s e Zd ZU dZdZdZdZdZdZdZ dZ
dZ dZ e
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Zd d Zd
d Zdd ZdZdZeZdd Zdd Zdd Z dd Z dd Z d d Z d d Z d!d" Z!e"d#d$ Z#d%d& Z$d'd( Z%e&'e% dS )*r0 a
A protocol for receiving L{AmpBox}es - key/value pairs - via length-prefixed
strings. A box is composed of:
- any number of key-value pairs, described by:
- a 2-byte network-endian packed key length (of which the first
byte must be null, and the second must be non-null: i.e. the
value of the length must be 1-255)
- a key, comprised of that many bytes
- a 2-byte network-endian unsigned value length (up to the maximum
of 65535)
- a value, comprised of that many bytes
- 2 null bytes
In other words, an even number of strings prefixed with packed unsigned
16-bit integers, and then a 0-length string to indicate the end of the box.
This protocol also implements 2 extra private bits of functionality related
to the byte boundaries between messages; it can start TLS between two given
boxes or switch to an entirely different protocol. However, due to some
tricky elements of the implementation, the public interface to this
functionality is L{ProtocolSwitchCommand} and L{StartTLS}.
@ivar _keyLengthLimitExceeded: A flag which is only true when the
connection is being closed because a key length prefix which was longer
than allowed by the protocol was received.
@ivar boxReceiver: an L{IBoxReceiver} provider, whose
L{IBoxReceiver.ampBoxReceived} method will be invoked for each
L{AmpBox} that is received.
FN
innerProtocolc C s t | || _d S r )r r boxReceiver)r r ra ra rg r s
zBinaryBoxProtocol.__init__c C s: | j }d| _ || _|| _|| j |r|| dS dS )a
Switch this BinaryBoxProtocol's transport to a new protocol. You need
to do this 'simultaneously' on both ends of a connection; the easiest
way to do this is to use a subclass of ProtocolSwitchCommand.
@param newProto: the new protocol instance to switch to.
@param clientFactory: the ClientFactory to send the
L{twisted.internet.protocol.ClientFactory.clientConnectionLost}
notification to.
r N)recvdr innerProtocolClientFactorymakeConnectionr r )r newProto
clientFactory newProtoDatara ra rg r s zBinaryBoxProtocol._switchToc C sL | j rtd| jdu rt | jdur | j| dS | j| dS )a/
Send a amp.Box to my peer.
Note: transport.write is never called outside of this method.
@param box: an AmpBox.
@raise ProtocolSwitched: if the protocol has previously been switched.
@raise ConnectionLost: if the connection has previously been lost.
z5This connection has switched: no AMP traffic allowed.N)_lockedrN r r _startingTLSBufferr writer r ra ra rg rq s
zBinaryBoxProtocol.sendBoxc C s || _ | j| | dS )z
Notify L{boxReceiver} that it is about to receive boxes from this
protocol by invoking L{IBoxReceiver.startReceivingBoxes}.
N)r r rw connectionMader r ra ra rg r " s z BinaryBoxProtocol.makeConnectionc C s2 | j rd| _ | jdur| j| dS t| |S )zg
Either parse incoming data as L{AmpBox}es or relay it to our nested
protocol.
FN)_justStartedTLSr r r )r datara ra rg r + s
z BinaryBoxProtocol.dataReceivedc C sv | j dur| j | | jdur| jd| | jr$ttdddd}n|tr1| j r1t
d}n|}| j | dS )zF
The connection was lost; notify any nested protocol.
NTFz4Peer rejected our certificate for an unknown reason.)
r connectionLostr clientConnectionLost_keyLengthLimitExceededr! rT r r r r r rz )r ry
failReasonra ra rg r 9 s
z BinaryBoxProtocol.connectionLostr] r^ c C s t | _| |S )z6
String received in the 'init' state.
)r+ _currentBox proto_keyr r ra ra rg
proto_initY s
z BinaryBoxProtocol.proto_initc C s. |r || _ | j| _dS | j| j d| _dS )zu
String received in the 'key' state. If the key is empty, a complete
box has been received.
r Ninit) _currentKey_MAX_VALUE_LENGTH
MAX_LENGTHr rx r r ra ra rg r ` s zBinaryBoxProtocol.proto_keyc C s || j | j< d| _| j| _dS )z7
String received in the 'value' state.
Nr )r r _MAX_KEY_LENGTHr r ra ra rg proto_valuen s z BinaryBoxProtocol.proto_valuec C s d| _ | j dS )z
The key length limit was exceeded. Disconnect the transport and make
sure a meaningful exception is reported.
TN)r r r )r lengthra ra rg lengthLimitExceededw s z%BinaryBoxProtocol.lengthLimitExceededc C s
d| _ dS )a
Lock this binary protocol so that no further boxes may be sent. This
is used when sending a request to switch underlying protocols. You
probably want to subclass ProtocolSwitchCommand rather than calling
this directly.
TN)r r ra ra rg r r z BinaryBoxProtocol._lockForSwitchc C s | j dur tdd| _dS )z
Unlock this locked binary protocol so that further boxes may be sent
again. This is used after an attempt to switch protocols has failed
for some reason.
Nz*Protocol already switched. Cannot unlock.F)r rN r r ra ra rg r s
z#BinaryBoxProtocol._unlockFromSwitchc C s. g | _ | jdurtd| j| j||ff dS )z
Used by StartTLSCommand to put us into the state where we don't
actually send things that get sent, instead we buffer them. see
L{_sendBoxCommand}.
NzUPreviously authenticated connection between %s and %s is trying to re-establish as %s)r hostCertificaterI peerCertificate)r r verifyAuthoritiesra ra rg r s
z BinaryBoxProtocol._prepareTLSc C sZ || _ d| _|du r d}| j|j| | j}|dur)d| _|D ] }| | q!dS dS )a<
Used by TLSBox to initiate the SSL handshake.
@param certificate: a L{twisted.internet.ssl.PrivateCertificate} for
use locally.
@param verifyAuthorities: L{twisted.internet.ssl.Certificate} instances
representing certificate authorities which will verify our peer.
TNra )r r r startTLSr r rq )r r r stlsbrp ra ra rg r s
zBinaryBoxProtocol._startTLSc C s | j rd S t| jS r )noPeerCertificater% peerFromTransportr r ra ra rg r s z!BinaryBoxProtocol.peerCertificatec C s( t |d | jdur| j dS dS )zv
The buck stops here. This error was completely unhandled, time to
terminate the connection.
zAmp server or network failure unhandled by client application. Dropping connection! To avoid, add errbacks to ALL remote commands!N)r r r r r ra ra rg rs s
z BinaryBoxProtocol.unhandledErrorc C s i S )aX
The default TLS responder doesn't specify any certificate or anything.
From a security perspective, it's little better than a plain-text
connection - but it is still a *bit* better, so it's included for
convenience.
You probably want to override this by providing your own StartTLS.responder.
ra r ra ra rg _defaultStartTLSResponder s
z+BinaryBoxProtocol._defaultStartTLSResponderr )(rk rl rm rn r r r r r r r r r r r r r r r rq r r r r r r r r r r r r r r r r rs r
rR r ra ra ra rg r0 sD
r0 c @ sD e Zd ZdZdZdddZdd Zdefd d
Zd d Z d
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dS )r( za
This protocol is an AMP connection. See the module docstring for protocol
details.
FNc C s: d| _ |d u r | }|d u r| }t| | t| | d S r )_ampInitializedr3 r r0 )r r r ra ra rg r s z AMP.__init__c C s( t | |}|dur |S t| |}|S )z
Unify the implementations of L{CommandLocator} and
L{SimpleStringLocator} to perform both kinds of dispatch, preferring
L{CommandLocator}.
@type name: C{bytes}
N)r6 r| rQ )r rc firstRespondersecondResponderra ra rg r| s
zAMP.locateResponderr c C s< | j dur d| j }nd}d| jj | dt| ddS )zo
A verbose string representation which gives us information about this
AMP connection.
Nz inner r )r r rk id)r innerReprra ra rg r
s
z AMP.__repr__c C sP | j st| | | _| | _td| j j
| j| jf t | | dS )zI
Emit a helpful log message when the connection is made.
z+%s connection established (HOST:%s PEER:%s)N)
r r( r r _transportPeergetHost_transportHostr msgr rk r0 r r ra ra rg r
s
zAMP.makeConnectionc C s2 t d| jj| j| jf t| | d| _dS )zI
Emit a helpful log message when the connection is lost.
z$%s connection lost (HOST:%s PEER:%s)N) r r r rk r r r0 r r r ra ra rg r
s
zAMP.connectionLost)NN) rk rl rm rn r r r| r r r r ra ra ra rg r( s
r( c @ sT e Zd ZdZdd Zdd Zdd ZdZd d
Zd d Z e
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d Z e
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_ParserHelperz:
A box receiver which records all boxes received.
c C s
g | _ d S r )r r ra ra rg r .
rp z_ParserHelper.__init__c C r` Nr ra r ra ra rg r 1
rs z_ParserHelper.getPeerc C r` r ra r ra ra rg r 4
rs z_ParserHelper.getHostFc C r` )z0
No initialization is required.
Nra )r senderra ra rg rw 9
ri z!_ParserHelper.startReceivingBoxesc C s | j | d S r )r r r ra ra rg rx >
s z _ParserHelper.ampBoxReceivedc C s. | }t |d}|| || |jS )z
Parse some amp data stored in a file.
@param fileObj: a file-like object.
@return: a list of AmpBoxes encoded in the given file.
)r )r0 r r readr )r fileObj parserHelperbbpra ra rg r[ B
s
z_ParserHelper.parsec C s | t|S )z
Parse some amp data stored in a string.
@param data: a str holding some amp-encoded data.
@return: a list of AmpBoxes encoded in the given string.
)r[ r )r r ra ra rg r\ Q
s z_ParserHelper.parseStringN)
rk rl rm rn r r r
disconnectingrw rx r r[ r\ ra ra ra rg r )
s
r c C s. i }| }|D ] \}}||||| q|S )a~
Convert an AmpBox to a dictionary of python objects, converting through a
given arglist.
@param strings: an AmpBox (or dict of strings)
@param arglist: a list of 2-tuples of strings and Argument objects, as
described in L{Command.arguments}.
@param proto: an L{AMP} instance.
@return: the converted dictionary mapping names to argument objects.
)r rh )rd arglistrf re myStringsargname argparserra ra rg r a
s
r c C s* | }|D ] \}}||||| q|S )a-
Convert a dictionary of python objects to an AmpBox, converting through a
given arglist.
@param objects: a dict mapping names to python objects
@param arglist: a list of 2-tuples of strings and Argument objects, as
described in L{Command.arguments}.
@param strings: [OUT PARAMETER] An object providing the L{dict}
interface which will be populated with serialized data.
@param proto: an L{AMP} instance.
@return: The converted dictionary mapping names to encoded argument
strings (identical to C{strings}).
)r rj )re r" rd rf myObjectsr$ r% ra ra rg r v
s r c @ r_ )r7 a
Encodes C{decimal.Decimal} instances.
There are several ways in which a decimal value might be encoded.
Special values are encoded as special strings::
- Positive infinity is encoded as C{"Infinity"}
- Negative infinity is encoded as C{"-Infinity"}
- Quiet not-a-number is encoded as either C{"NaN"} or C{"-NaN"}
- Signalling not-a-number is encoded as either C{"sNaN"} or C{"-sNaN"}
Normal values are encoded using the base ten string representation, using
engineering notation to indicate magnitude without precision, and "normal"
digits to indicate precision. For example::
- C{"1"} represents the value I{1} with precision to one place.
- C{"-1"} represents the value I{-1} with precision to one place.
- C{"1.0"} represents the value I{1} with precision to two places.
- C{"10"} represents the value I{10} with precision to two places.
- C{"1E+2"} represents the value I{10} with precision to one place.
- C{"1E-1"} represents the value I{0.1} with precision to one place.
- C{"1.5E+2"} represents the value I{15} with precision to two places.
U{http://speleotrove.com/decimal/} should be considered the authoritative
specification for the format.
c C s t |}t|S r )r decimalr7 rl ra ra rg rf
s
zDecimal.fromStringc C s" t |tjr
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Serialize a C{decimal.Decimal} instance to the specified wire format.
r z8amp.Decimal can only encode instances of decimal.Decimal)r r' r7 r r rw rm ra ra rg ri
s zDecimal.toStringNrz ra ra ra rg r7
s r7 c @ sl e Zd ZdZeddeddeddedd ed
d ed d
eddeddeddg Zdd Zdd ZdS )DateTimeaO
Encodes C{datetime.datetime} instances.
Wire format: '%04i-%02i-%02iT%02i:%02i:%02i.%06i%s%02i:%02i'. Fields in
order are: year, month, day, hour, minute, second, microsecond, timezone
direction (+ or -), timezone hour, timezone minute. Encoded string is
always exactly 32 characters long. This format is compatible with ISO 8601,
but that does not mean all ISO 8601 dates can be accepted.
Also, note that the datetime module's notion of a "timezone" can be
complex, but the wire format includes only a fixed offset, so the
conversion is not lossless. A lossless transmission of a C{datetime} instance
is not feasible since the receiving end would require a Python interpreter.
@ivar _positions: A sequence of slices giving the positions of various
interesting parts of the wire format.
r
c sp t t dkrtd fdd| jD } d }tj|g|dd R }|g|dd< tj| S )z|
Parse a string containing a date and time in the wire format into a
C{datetime.datetime} instance.
r9 zinvalid date format c s g | ]}t | qS ra )rq )r psra rg r
s z'DateTime.fromString..r5 r+ N)r r rw
_positions_FixedOffsetTZInfofromSignHoursMinutesdatetime)r r< r signtimezonera r; rg rf
s
zDateTime.fromStringc C s | }|du r td|jd |j d }|dkr d}nd}d|j|j|j|j|j|j |j
|t |d t |d f
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zm
Serialize a C{datetime.datetime} instance to a string in the specified
wire format.
NzUamp.DateTime cannot serialize naive datetime instances. You may find amp.utc useful.iQ < r +-z-%04i-%02i-%02iT%02i:%02i:%02i.%06i%s%02i:%02ir )
utcoffsetrw dayssecondsyearmonthdayhourminutesecond microsecondabsr )r r offset
minutesOffsetrA packedra ra rg ri
s,
zDateTime.toStringN)rk rl rm rn slicer= rf ri ra ra ra rg r(
s
r( )rn r@ r' r functoolsr ior itertoolsr structr typesr typingr r r r
r r r
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