zeroshade commented on code in PR #169:
URL: https://github.com/apache/arrow-go/pull/169#discussion_r1821330703
##########
arrow/cdata/exports.go:
##########
@@ -155,3 +190,229 @@ func exportStream(rdr array.RecordReader, out
*CArrowArrayStream) {
h := cgo.NewHandle(cRecordReader{rdr: rdr, err: nil})
out.private_data = createHandle(h)
}
+
+type cAsyncState struct {
+ ch chan AsyncRecordBatchStream
+ queueSize uint64
+ ctx context.Context
+}
+
+type taskState struct {
+ task CArrowAsyncTask
+ meta arrow.Metadata
+ err error
+}
+
+//export asyncStreamOnSchema
+func asyncStreamOnSchema(self *CArrowAsyncDeviceStreamHandler, schema
*CArrowSchema, addlMetadata *C.char) C.int {
+ h := getHandle(self.private_data)
+ handler := h.Value().(cAsyncState)
+ defer close(handler.ch)
+
+ if self.producer.device_type != C.ARROW_DEVICE_CPU {
+ handler.ch <- AsyncRecordBatchStream{Err:
fmt.Errorf("unsupported device type")}
+ return C.EINVAL
+ }
+
+ sc, err := ImportCArrowSchema(schema)
+ if err != nil {
+ handler.ch <- AsyncRecordBatchStream{Err: err}
+ return C.EINVAL
+ }
+
+ var meta arrow.Metadata
+ if addlMetadata != nil {
+ meta = decodeCMetadata(addlMetadata)
+ }
+
+ recordStream := make(chan RecordMessage, handler.queueSize)
+ taskQueue := make(chan taskState, handler.queueSize)
+ handler.ch <- AsyncRecordBatchStream{Schema: sc,
+ AdditionalMetadata: meta, Stream: recordStream}
Review Comment:
yup
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