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Diffstat (limited to 'python/google/protobuf/pyext/message.h')
| -rw-r--r-- | python/google/protobuf/pyext/message.h | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/python/google/protobuf/pyext/message.h b/python/google/protobuf/pyext/message.h new file mode 100644 index 0000000..9f4978f --- /dev/null +++ b/python/google/protobuf/pyext/message.h @@ -0,0 +1,305 @@ +// Protocol Buffers - Google's data interchange format +// Copyright 2008 Google Inc. All rights reserved. +// https://developers.google.com/protocol-buffers/ +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions are +// met: +// +// * Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// * Redistributions in binary form must reproduce the above +// copyright notice, this list of conditions and the following disclaimer +// in the documentation and/or other materials provided with the +// distribution. +// * Neither the name of Google Inc. nor the names of its +// contributors may be used to endorse or promote products derived from +// this software without specific prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +// Author: anuraag@google.com (Anuraag Agrawal) +// Author: tibell@google.com (Johan Tibell) + +#ifndef GOOGLE_PROTOBUF_PYTHON_CPP_MESSAGE_H__ +#define GOOGLE_PROTOBUF_PYTHON_CPP_MESSAGE_H__ + +#include <Python.h> + +#include <memory> +#ifndef _SHARED_PTR_H +#include <google/protobuf/stubs/shared_ptr.h> +#endif +#include <string> + + +namespace google { +namespace protobuf { + +class Message; +class Reflection; +class FieldDescriptor; + +using internal::shared_ptr; + +namespace python { + +struct CFieldDescriptor; +struct ExtensionDict; + +typedef struct CMessage { + PyObject_HEAD; + + // This is the top-level C++ Message object that owns the whole + // proto tree. Every Python CMessage holds a reference to it in + // order to keep it alive as long as there's a Python object that + // references any part of the tree. + shared_ptr<Message> owner; + + // Weak reference to a parent CMessage object. This is NULL for any top-level + // message and is set for any child message (i.e. a child submessage or a + // part of a repeated composite field). + // + // Used to make sure all ancestors are also mutable when first modifying + // a child submessage (in other words, turning a default message instance + // into a mutable one). + // + // If a submessage is released (becomes a new top-level message), this field + // MUST be set to NULL. The parent may get deallocated and further attempts + // to use this pointer will result in a crash. + struct CMessage* parent; + + // Weak reference to the parent's descriptor that describes this submessage. + // Used together with the parent's message when making a default message + // instance mutable. + // TODO(anuraag): With a bit of work on the Python/C++ layer, it should be + // possible to make this a direct pointer to a C++ FieldDescriptor, this would + // be easier if this implementation replaces upstream. + CFieldDescriptor* parent_field; + + // Pointer to the C++ Message object for this CMessage. The + // CMessage does not own this pointer. + Message* message; + + // Indicates this submessage is pointing to a default instance of a message. + // Submessages are always first created as read only messages and are then + // made writable, at which point this field is set to false. + bool read_only; + + // A reference to a Python dictionary containing CMessage, + // RepeatedCompositeContainer, and RepeatedScalarContainer + // objects. Used as a cache to make sure we don't have to make a + // Python wrapper for the C++ Message objects on every access, or + // deal with the synchronization nightmare that could create. + PyObject* composite_fields; + + // A reference to the dictionary containing the message's extensions. + // Similar to composite_fields, acting as a cache, but also contains the + // required extension dict logic. + ExtensionDict* extensions; +} CMessage; + +extern PyTypeObject CMessage_Type; + +namespace cmessage { + +// Create a new empty message that can be populated by the parent. +PyObject* NewEmpty(PyObject* type); + +// Release a submessage from its proto tree, making it a new top-level messgae. +// A new message will be created if this is a read-only default instance. +// +// Corresponds to reflection api method ReleaseMessage. +int ReleaseSubMessage(google::protobuf::Message* message, + const google::protobuf::FieldDescriptor* field_descriptor, + CMessage* child_cmessage); + +// Initializes a new CMessage instance for a submessage. Only called once per +// submessage as the result is cached in composite_fields. +// +// Corresponds to reflection api method GetMessage. +PyObject* InternalGetSubMessage(CMessage* self, + CFieldDescriptor* cfield_descriptor); + +// Deletes a range of C++ submessages in a repeated field (following a +// removal in a RepeatedCompositeContainer). +// +// Releases messages to the provided cmessage_list if it is not NULL rather +// than just removing them from the underlying proto. This cmessage_list must +// have a CMessage for each underlying submessage. The CMessages refered to +// by slice will be removed from cmessage_list by this function. +// +// Corresponds to reflection api method RemoveLast. +int InternalDeleteRepeatedField(google::protobuf::Message* message, + const google::protobuf::FieldDescriptor* field_descriptor, + PyObject* slice, PyObject* cmessage_list); + +// Sets the specified scalar value to the message. +int InternalSetScalar(CMessage* self, + const google::protobuf::FieldDescriptor* field_descriptor, + PyObject* value); + +// Retrieves the specified scalar value from the message. +// +// Returns a new python reference. +PyObject* InternalGetScalar(CMessage* self, + const google::protobuf::FieldDescriptor* field_descriptor); + +// Clears the message, removing all contained data. Extension dictionary and +// submessages are released first if there are remaining external references. +// +// Corresponds to message api method Clear. +PyObject* Clear(CMessage* self); + +// Clears the data described by the given descriptor. Used to clear extensions +// (which don't have names). Extension release is handled by ExtensionDict +// class, not this function. +// TODO(anuraag): Try to make this discrepancy in release semantics with +// ClearField less confusing. +// +// Corresponds to reflection api method ClearField. +PyObject* ClearFieldByDescriptor( + CMessage* self, + const google::protobuf::FieldDescriptor* descriptor); + +// Clears the data for the given field name. The message is released if there +// are any external references. +// +// Corresponds to reflection api method ClearField. +PyObject* ClearField(CMessage* self, PyObject* arg); + +// Checks if the message has the field described by the descriptor. Used for +// extensions (which have no name). +// +// Corresponds to reflection api method HasField +PyObject* HasFieldByDescriptor( + CMessage* self, const google::protobuf::FieldDescriptor* field_descriptor); + +// Checks if the message has the named field. +// +// Corresponds to reflection api method HasField. +PyObject* HasField(CMessage* self, PyObject* arg); + +// Initializes constants/enum values on a message. This is called by +// RepeatedCompositeContainer and ExtensionDict after calling the constructor. +// TODO(anuraag): Make it always called from within the constructor since it can +int InitAttributes(CMessage* self, PyObject* descriptor, PyObject* kwargs); + +PyObject* MergeFrom(CMessage* self, PyObject* arg); + +// Retrieves an attribute named 'name' from CMessage 'self'. Returns +// the attribute value on success, or NULL on failure. +// +// Returns a new reference. +PyObject* GetAttr(CMessage* self, PyObject* name); + +// Set the value of the attribute named 'name', for CMessage 'self', +// to the value 'value'. Returns -1 on failure. +int SetAttr(CMessage* self, PyObject* name, PyObject* value); + +PyObject* FindInitializationErrors(CMessage* self); + +// Set the owner field of self and any children of self, recursively. +// Used when self is being released and thus has a new owner (the +// released Message.) +int SetOwner(CMessage* self, const shared_ptr<Message>& new_owner); + +int AssureWritable(CMessage* self); + +} // namespace cmessage + +/* Is 64bit */ +#define IS_64BIT (SIZEOF_LONG == 8) + +#define FIELD_BELONGS_TO_MESSAGE(field_descriptor, message) \ + ((message)->GetDescriptor() == (field_descriptor)->containing_type()) + +#define FIELD_IS_REPEATED(field_descriptor) \ + ((field_descriptor)->label() == google::protobuf::FieldDescriptor::LABEL_REPEATED) + +#define GOOGLE_CHECK_GET_INT32(arg, value, err) \ + int32 value; \ + if (!CheckAndGetInteger(arg, &value, kint32min_py, kint32max_py)) { \ + return err; \ + } + +#define GOOGLE_CHECK_GET_INT64(arg, value, err) \ + int64 value; \ + if (!CheckAndGetInteger(arg, &value, kint64min_py, kint64max_py)) { \ + return err; \ + } + +#define GOOGLE_CHECK_GET_UINT32(arg, value, err) \ + uint32 value; \ + if (!CheckAndGetInteger(arg, &value, kPythonZero, kuint32max_py)) { \ + return err; \ + } + +#define GOOGLE_CHECK_GET_UINT64(arg, value, err) \ + uint64 value; \ + if (!CheckAndGetInteger(arg, &value, kPythonZero, kuint64max_py)) { \ + return err; \ + } + +#define GOOGLE_CHECK_GET_FLOAT(arg, value, err) \ + float value; \ + if (!CheckAndGetFloat(arg, &value)) { \ + return err; \ + } \ + +#define GOOGLE_CHECK_GET_DOUBLE(arg, value, err) \ + double value; \ + if (!CheckAndGetDouble(arg, &value)) { \ + return err; \ + } + +#define GOOGLE_CHECK_GET_BOOL(arg, value, err) \ + bool value; \ + if (!CheckAndGetBool(arg, &value)) { \ + return err; \ + } + + +extern PyObject* kPythonZero; +extern PyObject* kint32min_py; +extern PyObject* kint32max_py; +extern PyObject* kuint32max_py; +extern PyObject* kint64min_py; +extern PyObject* kint64max_py; +extern PyObject* kuint64max_py; + +#define C(str) const_cast<char*>(str) + +void FormatTypeError(PyObject* arg, char* expected_types); +template<class T> +bool CheckAndGetInteger( + PyObject* arg, T* value, PyObject* min, PyObject* max); +bool CheckAndGetDouble(PyObject* arg, double* value); +bool CheckAndGetFloat(PyObject* arg, float* value); +bool CheckAndGetBool(PyObject* arg, bool* value); +bool CheckAndSetString( + PyObject* arg, google::protobuf::Message* message, + const google::protobuf::FieldDescriptor* descriptor, + const google::protobuf::Reflection* reflection, + bool append, + int index); +PyObject* ToStringObject( + const google::protobuf::FieldDescriptor* descriptor, string value); + +extern PyObject* PickleError_class; + +} // namespace python +} // namespace protobuf + +} // namespace google +#endif // GOOGLE_PROTOBUF_PYTHON_CPP_MESSAGE_H__ |