func doFinish(call rpc.ClientCall, numResults int) (C.SwiftByteArrayArray, error) {
// Have all the results be decoded into *vdl.Value.
resultPtrs := make([]interface{}, numResults)
for i := 0; i < numResults; i++ {
value := new(vdl.Value)
resultPtrs[i] = &value
}
if err := call.Finish(resultPtrs...); err != nil {
// Invocation error.
return EmptySwiftByteArrayArray(), err
}
// VOM-encode the results. Note in the future we'll want a pathway where we can get the original VOM results
// from finish so we don't end up wasting CPU & memory here.
// Prepare the byte array array that can be accessed from Swift via C.malloc
vomResultsMemory := C.malloc(C.size_t(numResults * int(C.sizeofSwiftByteArray)))
// Make that malloc'd memory available as a slice to Go.
vomResultsPtrsHdr := reflect.SliceHeader{
Data: uintptr(vomResultsMemory),
Len: numResults,
Cap: numResults,
}
vomResults := *(*[]C.SwiftByteArray)(unsafe.Pointer(&vomResultsPtrsHdr))
// Create the C Struct to return that encapsulates our byte array array
var cVomResults C.SwiftByteArrayArray
cVomResults.length = C._GoUint64(numResults)
cVomResults.data = (*C.SwiftByteArray)(vomResultsMemory)
// For each result, VOM encode into a byte array that we stick into the returned struct
for i, resultPtr := range resultPtrs {
// Remove the pointer from the result. Simply *resultPtr doesn't work
// as resultPtr is of type interface{}.
result := interface{}(sutil.DerefOrDie(resultPtr))
var vomResult []byte
var err error
if vomResult, err = vom.Encode(result); err != nil {
return EmptySwiftByteArrayArray(), err
}
cVomResultCopy := C.malloc(C.size_t(len(vomResult)))
C.memcpy(cVomResultCopy, unsafe.Pointer(&vomResult[0]), C.size_t(len(vomResult)))
var cVomResult C.SwiftByteArray
cVomResult.length = C._GoUint64(len(vomResult))
cVomResult.data = cVomResultCopy
vomResults[i] = cVomResult
}
return cVomResults, nil
}
func EmptySwiftByteArrayArray() C.SwiftByteArrayArray {
var empty C.SwiftByteArrayArray
empty.length = 0
empty.data = nil
return empty
}