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GH-34031: [Python][DRAFT] Experiment with PyCapsule for communicating C Data Interface pointers #35739

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GH-34031: [Python][DRAFT] Experiment with PyCapsule for communicating C Data Interface pointers #35739

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25 changes: 24 additions & 1 deletion python/pyarrow/ipc.pxi
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@

from collections import namedtuple
import warnings

cimport cpython

cpdef enum MetadataVersion:
V1 = <char> CMetadataVersion_V1
Expand Down Expand Up @@ -814,6 +814,29 @@ cdef class RecordBatchReader(_Weakrefable):
self.reader = c_reader
return self

@staticmethod
def _import_from_c_capsule(stream):
cdef:
ArrowArrayStream* c_stream
shared_ptr[CRecordBatchReader] c_reader
RecordBatchReader self

# sanity checks
if not cpython.PyCapsule_IsValid(stream, 'arrowarraystream'):
raise ValueError(
"Not an ArrayArrayStream object"
)
c_stream = <ArrowArrayStream*>cpython.PyCapsule_GetPointer(
stream, 'arrowarraystream'
)

with nogil:
c_reader = GetResultValue(ImportRecordBatchReader(c_stream))

self = RecordBatchReader.__new__(RecordBatchReader)
self.reader = c_reader
return self

@staticmethod
def from_batches(Schema schema not None, batches):
"""
Expand Down