python/message.h

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#ifndef PYPB_MESSAGE_H__
#define PYPB_MESSAGE_H__

#include <stdbool.h>

#include "python/protobuf.h"
#include "upb/reflection.h"

// Removes the wrapper object for this field from the unset subobject cache.
void PyUpb_CMessage_CacheDelete(PyObject* _self, const upb_fielddef* f);

// Sets the field value for `f` to `subobj`, evicting the wrapper object from
// the "unset subobject" cache now that real data exists for it.  The caller
// must also update the wrapper associated with `f` to point to `subobj` also.
void PyUpb_CMessage_SetConcreteSubobj(PyObject* _self, const upb_fielddef* f,
                                      upb_msgval subobj);

// Gets a Python wrapper object for message `u_msg` of type `m`, returning a
// cached wrapper if one was previously created.  If a new object is created,
// it will reference `arena`, which must own `u_msg`.
PyObject* PyUpb_CMessage_Get(upb_msg* u_msg, const upb_msgdef* m,
                             PyObject* arena);

// Verifies that a Python object is a message.  Sets a TypeError exception and
// returns false on failure.
bool PyUpb_CMessage_Check(PyObject* self);

// Gets the upb_msg* for this message object if the message is set/writable.
// Otherwise returns NULL.
upb_msg* PyUpb_CMessage_GetIfWritable(PyObject* _self);

// Returns the `upb_msgdef` for a given CMessage.
const upb_msgdef* PyUpb_CMessage_GetMsgdef(PyObject* self);

// Functions that match the corresponding methods on the message object.
PyObject* PyUpb_CMessage_MergeFrom(PyObject* self, PyObject* arg);
PyObject* PyUpb_CMessage_MergeFromString(PyObject* self, PyObject* arg);
PyObject* PyUpb_CMessage_SerializeToString(PyObject* self, PyObject* args,
                                           PyObject* kwargs);

// Sets fields of the message according to the attribuges in `kwargs`.
int PyUpb_CMessage_InitAttributes(PyObject* _self, PyObject* args,
                                  PyObject* kwargs);

// Clears the ExtensionDict from the message.  The message must have an
// ExtensionDict set.
void PyUpb_CMessage_ClearExtensionDict(PyObject* _self);

// Implements the equivalent of getattr(msg, field), once `field` has
// already been resolved to a `upb_fielddef*`.
PyObject* PyUpb_CMessage_GetFieldValue(PyObject* _self,
                                       const upb_fielddef* field);

// Implements the equivalent of setattr(msg, field, value), once `field` has
// already been resolved to a `upb_fielddef*`.
int PyUpb_CMessage_SetFieldValue(PyObject* _self, const upb_fielddef* field,
                                 PyObject* value);

// Returns the version associated with this message.  The version will be
// incremented when the message changes.
int PyUpb_CMessage_GetVersion(PyObject* _self);

// Module-level init.
bool PyUpb_InitMessage(PyObject* m);

#endif  // PYPB_MESSAGE_H__