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Contains a metaclass and helper functions used to create
protocol message classes from Descriptor objects at runtime.
Recall that a metaclass is the "type" of a class.
(A class is to a metaclass what an instance is to a class.)
In this case, we use the GeneratedProtocolMessageType metaclass
to inject all the useful functionality into the classes
output by the protocol compiler at compile-time.
The upshot of all this is that the real implementation
details for ALL pure-Python protocol buffers are *here in
this file*.
s# robinson@google.com (Will Robinson)i( t BytesION( t api_implementation( t
containers( t decoder( t encoder( t enum_type_wrapper( t message_listener( t
type_checkers( t well_known_types( t wire_format( t
descriptor( t message( t text_formats google.protobuf.Anyt GeneratedProtocolMessageTypec B s& e Z d Z d Z d Z d Z RS( sQ Metaclass for protocol message classes created at runtime from Descriptors.
We add implementations for all methods described in the Message class. We
also create properties to allow getting/setting all fields in the protocol
message. Finally, we create slots to prevent users from accidentally
"setting" nonexistent fields in the protocol message, which then wouldn't get
serialized / deserialized properly.
The protocol compiler currently uses this metaclass to create protocol
message classes at runtime. Clients can also manually create their own
classes at runtime, as in this example:
mydescriptor = Descriptor(.....)
factory = symbol_database.Default()
factory.pool.AddDescriptor(mydescriptor)
MyProtoClass = factory.GetPrototype(mydescriptor)
myproto_instance = MyProtoClass()
myproto.foo_field = 23
...
t
DESCRIPTORc C s~ | t j } | j t j k r9 | t j | j f 7} n t | | t | | t t | } | j | | | | } | S( s Custom allocation for runtime-generated class types.
We override __new__ because this is apparently the only place
where we can meaningfully set __slots__ on the class we're creating(?).
(The interplay between metaclasses and slots is not very well-documented).
Args:
name: Name of the class (ignored, but required by the
metaclass protocol).
bases: Base classes of the class we're constructing.
(Should be message.Message). We ignore this field, but
it's required by the metaclass protocol
dictionary: The class dictionary of the class we're
constructing. dictionary[_DESCRIPTOR_KEY] must contain
a Descriptor object describing this protocol message
type.
Returns:
Newly-allocated class.
( R
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t | } n% t j | j | j } | | f j | j } | j j d k r0 t | n | j | S( N( R% t _SetListenerR[ R! t _OneofListenerRA ( R t result( R. RK ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt MakeSubMessageDefault s
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c C s t j d } t | j d k rY t | t k rY t d t | | | f } n t j t | | t j d d S( sC Re-raise the currently-handled TypeError with the field name added.i s %s for field %s.%si N( t syst exc_infot lent argsRF t TypeErrort strt sixt reraise( t message_namet
field_namet exc( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt _ReraiseTypeErrorWithFieldName s '"c s: d f d } d | _ d | _ | | _ d S( s Adds an __init__ method to cls.c S sX t | t j rT y | j | j SWqT t k
rP t d | j | f qT Xn | S( s Convert a string or integer enum value to an integer.
If the value is a string, it is converted to the enum value in
enum_type with the same name. If the value is not a string, it's
returned as-is. (No conversion or bounds-checking is done.)
s Enum type %s: unknown label "%s"( R4 R t string_typest values_by_nameRW R6 R R ( R RN ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt _GetIntegerEnumValue s
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= c C s@ y | j | SWn* t k
r; t d | j | f n Xd S( s Returns a field descriptor by field name.
Args:
message_descriptor: A Descriptor describing all fields in message.
field_name: The name of the field to retrieve.
Returns:
The field descriptor associated with the field name.
s& Protocol message %s has no "%s" field.N( RO R6 R R ( RE R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR s
c C sC x | j D] } t | | q
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t | S( N( t _ExtensionDict( R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt / t N( R# t _AddPropertiesForFieldt
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| | n
t | | d S( s# Adds a public property for a protocol message field.
Clients can use this property to get and (in the case
of non-repeated scalar fields) directly set the value
of a protocol message field.
Args:
field: A FieldDescriptor for this field.
cls: The class we're constructing.
t
_FIELD_NUMBERN( R t upperR RW RH R5 Rk t _AddPropertiesForRepeatedFieldRP RQ t* _AddPropertiesForNonRepeatedCompositeFieldt' _AddPropertiesForNonRepeatedScalarField( R. R t
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can use this property to get the value of the field, which will be either a
_RepeatedScalarFieldContainer or _RepeatedCompositeFieldContainer (see
below).
Note that when clients add values to these containers, we perform
type-checking in the case of repeated scalar fields, and we also set any
necessary "has" bits as a side-effect.
Args:
field: A FieldDescriptor for this field.
cls: The class we're constructing.
c sI | j j } | d k rE j | } | j j | } n | S( N( R= t getR! R_ t
setdefault( R R ( R. ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt getter\ s
s Getter for %s.c s t d d S( NsI Assignment not allowed to repeated field "%s" in protocol message object.( t AttributeError( R t new_value( R2 ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt settero s s/ Magic attribute generated for "%s" proto field.t docN( R R3 R! R0 R1 R R ( R. R t
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s Adds a public property for a nonrepeated, scalar protocol message field.
Clients can use this property to get and directly set the value of the field.
Note that when the client sets the value of a field by using this property,
all necessary "has" bits are set as a side-effect, and we also perform
type-checking.
Args:
field: A FieldDescriptor for this field.
cls: The class we're constructing.
t proto3c s | j j S( N( R= R ( R ( R R. ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR s s Getter for %s.c sY j | } r2 | r2 | j j d n
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c s | | | j d S( N( t _UpdateOneofState( R R ( R. R ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR s
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c sv j t } f d } d | _ d | _ f d } d } t | | t | | d | d S( sN Adds a public property for a nonrepeated, composite protocol message field.
A composite field is a "group" or "message" field.
Clients can use this property to get the value of the field, but cannot
assign to the property directly.
Args:
field: A FieldDescriptor for this field.
cls: The class we're constructing.
c sI | j j } | d k rE j | } | j j | } n | S( N( R= R R! R_ R ( R R ( R. ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR s
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c C s | j } x= | j D]/ \ } } | j d } t | | | j q W| j d k r | j j } | j | | _ | j | | _ n d S( s= Adds properties for all fields in this protocol message type.R N(
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FromString s
( t staticmethodR R ( R R R ( ( R sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR* s c C sM | d j t j k r$ t | d S| d j t j k rE | d j St Sd S( s Given a (FieldDescriptor, value) tuple from _fields, return true if the
value should be included in the list returned by ListFields().i i N( RH R5 Rk t boolRP RQ R? R{ ( t item( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt
_IsPresent s
c C s d } | | _ d S( s Helper for _AddMessageMethods().c S sE g | j j D] } t | r | ^ q } | j d d | S( NR c S s | d j S( Ni ( RW ( R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR R ( R= R R t sort( R R t
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ListFields s .N( R ( RE R R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt _AddListFieldsMethod s s: Protocol message has no non-repeated submessage field "%s"s/ Protocol message has no non-repeated field "%s"c s | j d k } | r t n t i x^ | j D]S } | j t j k rO q1 n | rw | j t j k rw | j rw q1 n | | j
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t j | S( N( R t MessageToString( R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt __str__ s N( R ( RE R R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt
_AddStrMethod s c C s d } | | _ d S( s Helper for _AddMessageMethods().c S s
t j | S( N( R R ( R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt __repr__ s N( R ( RE R R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt _AddReprMethod s c C s d } | | _ d S( s Helper for _AddMessageMethods().c S s t j | d t j d S( Nt as_utf8s utf-8( R R R{ t decode( R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt __unicode__ s N( R# ( t unused_message_descriptorR R# ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt _AddUnicodeMethod s c C sI y t j | } | | | SWn$ t k
rD t j d | n Xd S( s Returns the number of bytes needed to serialize a non-repeated element.
The returned byte count includes space for tag information and any
other additional space associated with serializing value.
Args:
value: Value we're serializing.
field_number: Field number of this value. (Since the field number
is stored as part of a varint-encoded tag, this has an impact
on the total bytes required to serialize the value).
field_type: The type of the field. One of the TYPE_* constants
within FieldDescriptor.
s Unrecognized field type: %dN( R t TYPE_TO_BYTE_SIZE_FNR6 R t EncodeError( RN t field_numbert
field_typet fn( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt _BytesForNonRepeatedElement s
c C s d } | | _ d S( s Helper for _AddMessageMethods().c S s | j s | j Sd } | j } | j j rg | j d j | j } | | j d j | j 7} nd x- | j D] \ } } | | j | 7} qt Wx1 | j
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IsInitializedR R' R R t joint FindInitializationErrorst SerializePartialToString( R R t errors( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt SerializeToString s (N( R7 ( RE R R7 ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt _AddSerializeToStringMethod s c C s+ d } | | _ d d } | | _ d S( s Helper for _AddMessageMethods().c [ s& t } | j | j | | j S( N( R t _InternalSerializet writet getvalue( R R t out( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR5 s c S s | d k r t j } n t | } | j } | j j r| | j d j | | j | | j d j | | j
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c se g | j D] } | j t j k r
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d f d } | | _ f d } | | _ d S( s[ Adds the IsInitialized and FindInitializationError methods to the
protocol message class.c s` xf D]^ } | | j k s? | j t j k r | j | j r | d k ra | j | j n t Sq Wx t | j j
D] \ } } | j t j k r | j t j k r| j
j r | j
j j r q n x | D]8 } | j s | d k r| j | j n t Sq WqX| j rX| j rX| d k rQ| j | j n t Sq q Wt S( s Checks if all required fields of a message are set.
Args:
errors: A list which, if provided, will be populated with the field
paths of all missing required fields.
Returns:
True iff the specified message has all required fields set.
N( R= RP R5 RQ R? R! R R4 Rm R R RH Rk RK R R RL R2 R{ ( R R6 R. RN t element( t required_fields( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR2 n s.
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Returns:
A list of strings. Each string is a path to an uninitialized field from
the top-level message, e.g. "foo.bar[5].baz".
s (%s)s %s[%s].s %s[%d].t .( Ro R RK R RP R5 RQ R7 R RM RS R4 RH Rk t rangeR ( R R6 R. RN R R R[ t prefixt
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| } | | | | j | } | d k r| j
| } | | | qT | | j | <| j rT | j | qT qT W| j rv| j s`g | _ n | j j | j n d S( NsL Parameter to MergeFrom() must be instance of same class: expected %s got %s.( R4 R R/ t __class__R R= R RH R R! R_ R RP R? R[ R R> R ( R R R# R. RN R ( RQ Rk R ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR s6
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r4 t d | n X| j j | d } | d k ro | j | j ro | j Sd Sd S( sD Returns the name of the currently set field inside a oneof, or None.s) Protocol message has no oneof "%s" field.N( R R6 R RC R R! Ro R ( R t
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s c C sy g | _ xi | j D][ \ } } | j t j k r | j t j k rd x% | D] } | j qM Wqq | j q q Wd S( N( R> R RP R5 RQ RH Rk t DiscardUnknownFields( R R. RN t sub_message( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt _DiscardUnknownFields s
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| | t | | t | | t
| | t | | t | t | | t | t | _ t | _ t | _ d S( s3 Adds implementations of all Message methods to cls.N( R R R R R R R R R R% R0 R8 RA RZ Rc Re Ri Rl Rm t ClearRp Rn R ( RE R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR+ $ s*
c C s1 d } d } | | _ | | _ | | _ d S( s5 Adds implementation of private helper methods to cls.c S s; | j s7 t | _ t | j _ t | _ | j j n d S( sw Sets the _cached_byte_size_dirty bit to true,
and propagates this to our listener iff this was a state change.
N( R< R{ RA R, R? R@ t Modified( R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyRs A s
c S sE | j j | j | } | | k rA | j | =| | j | j s
R c B s e Z d Z d Z d Z RS( s0 MessageListener implementation that a parent message registers with its
child message.
In order to support semantics like:
foo.bar.baz.qux = 23
assert foo.HasField('bar')
...child objects must have back references to their parents.
This helper class is at the heart of this support.
c C s= t | t j r | | _ n t j | | _ t | _ d S( s Args:
parent_message: The message whose _Modified() method we should call when
we receive Modified() messages.
N( R4 t weakreft ProxyTypet _parent_message_weakreft proxyRm R, ( R t parent_message( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR- n s c C s6 | j r
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r1 n Xd S( N( R, Rx R t ReferenceError( R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyRs s
( R/ R0 R1 R- Rs ( ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR ` s R c B s e Z d Z d Z d Z RS( sC Special listener implementation for setting composite oneof fields.c C s# t t | j | | | _ d S( s Args:
parent_message: The message whose _Modified() method we should call when
we receive Modified() messages.
field: The descriptor of the field being set in the parent message.
N( R R R- t _field( R Rz R. ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR- s c C sB y* | j j | j t t | j Wn t k
r= n Xd S( sE Also updates the state of the containing oneof in the parent message.N( Rx R R| R R Rs R{ ( R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyRs s
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RS( s Dict-like container for supporting an indexable "Extensions"
field on proto instances.
Note that in all cases we expect extension handles to be
FieldDescriptors.
c C s
| | _ d S( sM extended_message: Message instance for which we are the Extensions dict.
N( t _extended_message( R t extended_message( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR- s c C s t | j | | j j j | } | d k r5 | S| j t j k r\ | j | j } nV | j t j
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r q Xn | j S| j j j | | } | S( s8 Returns the current value of the given extension handle.N( R: R} R= R R! RH R5 Rk R_ RP RQ RK R% R RA R{ R R ( R R9 R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt __getitem__ s
c C s t | | j s t S| j j } | j j } g | D] } | j r; | ^ q; } g | D] } | j r] | ^ q] } | | k S( N( R4 Rd Rm R} R R7 ( R R t my_fieldst other_fieldsR. ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR s ""c C s | | k S( N( ( R R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt __ne__ s c C s t d d S( Ns unhashable object( R ( R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt __hash__ s c C s t | j | | j t j k s4 | j t j k rJ t d | j n t j
| } | j | | j j | <| j j
d S( sl If extension_handle specifies a non-repeated, scalar extension
field, sets the value of that field.
sK Cannot assign to extension "%s" because it is a repeated or composite type.N( R: R} RH R5 Rk RP RQ R R R R R R= R ( R R9 RN R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt __setitem__ s c C s | j j j | d S( s Tries to find a known extension with the specified name.
Args:
name: Extension full name.
Returns:
Extension field descriptor.
N( R} R R R! ( R R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt _FindExtensionByName s c C s | j j j | d S( s Tries to find a known extension with the field number.
Args:
number: Extension field number.
Returns:
Extension field descriptor.
N( R} R R R! ( R RW ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt _FindExtensionByNumber s ( R/ R0 R1 R- R R R R R R R ( ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR s !
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