milvus/internal/querynode/cgo_helper.go

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// Copyright (C) 2019-2020 Zilliz. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License
// is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
// or implied. See the License for the specific language governing permissions and limitations under the License.
package querynode
/*
#cgo CFLAGS: -I${SRCDIR}/../core/output/include
#cgo LDFLAGS: -L${SRCDIR}/../core/output/lib -lmilvus_segcore -Wl,-rpath=${SRCDIR}/../core/output/lib
#include "segcore/collection_c.h"
#include "common/type_c.h"
#include "segcore/segment_c.h"
*/
import "C"
import (
"errors"
"fmt"
"github.com/golang/protobuf/proto"
"github.com/milvus-io/milvus/internal/log"
"github.com/milvus-io/milvus/internal/proto/commonpb"
"github.com/milvus-io/milvus/internal/proto/schemapb"
"unsafe"
)
// ProtoCGo is protobuf created by go side,
// passed to c side
// memory is managed by go GC
type ProtoCGo struct {
CProto C.CProto
blob []byte
}
func MarshalForCGo(msg proto.Message) (*ProtoCGo, error) {
blob, err := proto.Marshal(msg)
if err != nil {
return nil, err
}
protoCGo := &ProtoCGo{
blob: blob,
CProto: C.CProto{
proto_size: (C.int64_t)(len(blob)),
proto_blob: unsafe.Pointer(&blob[0]),
},
}
return protoCGo, nil
}
func (protoCGo *ProtoCGo) destruct() {
// NOTE: at ProtoCGo, blob is go heap memory, no need to destruct
protoCGo.blob = nil
}
func HandleCStatus(status *C.CStatus, extraInfo string) error {
if status.error_code == 0 {
return nil
}
errorCode := status.error_code
errorName, ok := commonpb.ErrorCode_name[int32(errorCode)]
if !ok {
errorName = "UnknownError"
}
errorMsg := C.GoString(status.error_msg)
defer C.free(unsafe.Pointer(status.error_msg))
finalMsg := fmt.Sprintf("[%s] %s", errorName, errorMsg)
logMsg := fmt.Sprintf("%s, C Runtime Exception: %s\n", extraInfo, finalMsg)
log.Error(logMsg)
return errors.New(finalMsg)
}
func HandleCProtoResult(cRes *C.CProtoResult, msg proto.Message) error {
// Standalone CProto is protobuf created by C side,
// Passed from c side
// memory is managed manually
err := HandleCStatus(&cRes.status, "")
if err != nil {
return err
}
cpro := cRes.proto
blob := C.GoBytes(unsafe.Pointer(cpro.proto_blob), C.int32_t(cpro.proto_size))
defer C.free(cpro.proto_blob)
return proto.Unmarshal(blob, msg)
}
// TestBoolArray this function will accept a BoolArray input,
// and return a BoolArray output
// which negates all elements of the input
func TestBoolArray(cpb *ProtoCGo) (*schemapb.BoolArray, error) {
res := C.CTestBoolArrayPb(cpb.CProto)
ba := new(schemapb.BoolArray)
err := HandleCProtoResult(&res, ba)
return ba, err
}