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cluster_client_get.go
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/
cluster_client_get.go
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package vs
import (
"errors"
"fmt"
"github.com/chrislusf/vasto/pb"
)
var (
// ErrorNotFound error when no matching records are found
ErrorNotFound = errors.New("not found")
// ErrorWrongDataFormat error when data type is unexpected
ErrorWrongDataFormat = errors.New("wrong data format")
)
// Get gets the value bytes by the key
func (c *ClusterClient) Get(key *KeyObject) ([]byte, pb.OpAndDataType, error) {
request := &pb.Request{
Get: &pb.GetRequest{
Key: key.GetKey(),
PartitionHash: key.GetPartitionHash(),
},
}
var response *pb.Response
err := c.BatchProcess([]*pb.Request{request}, func(responses []*pb.Response, err error) error {
if err != nil {
return err
}
if len(responses) == 0 {
return ErrorNotFound
}
response = responses[0]
return nil
})
if err != nil {
return nil, pb.OpAndDataType_BYTES, fmt.Errorf("get error: %v", err)
}
if response.Get.Status != "" {
return nil, pb.OpAndDataType_BYTES, fmt.Errorf(response.Get.Status)
}
kv := response.Get.KeyValue
if kv == nil {
return nil, pb.OpAndDataType_BYTES, ErrorNotFound
}
return kv.Value, kv.DataType, nil
}