github.com/insionng/yougam@v0.0.0-20170714101924-2bc18d833463/libraries/pingcap/tidb/store/tikv/pd_codec.go (about)

     1  // Copyright 2016 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package tikv
    15  
    16  import (
    17  	"github.com/insionng/yougam/libraries/juju/errors"
    18  	"github.com/insionng/yougam/libraries/pingcap/kvproto/pkg/metapb"
    19  	"github.com/insionng/yougam/libraries/pingcap/pd/pd-client"
    20  	"github.com/insionng/yougam/libraries/pingcap/tidb/util/codec"
    21  )
    22  
    23  type codecPDClient struct {
    24  	pd.Client
    25  }
    26  
    27  // GetRegion encodes the key before send requests to pd-server and decodes the
    28  // returned StartKey && EndKey from pd-server.
    29  func (c *codecPDClient) GetRegion(key []byte) (*metapb.Region, error) {
    30  	encodedKey := codec.EncodeBytes([]byte(nil), key)
    31  	region, err := c.Client.GetRegion(encodedKey)
    32  	if err != nil {
    33  		return nil, errors.Trace(err)
    34  	}
    35  	if len(region.StartKey) != 0 {
    36  		_, decoded, err := codec.DecodeBytes(region.StartKey)
    37  		if err != nil {
    38  			return nil, errors.Trace(err)
    39  		}
    40  		region.StartKey = decoded
    41  	}
    42  	if len(region.EndKey) != 0 {
    43  		_, decoded, err := codec.DecodeBytes(region.EndKey)
    44  		if err != nil {
    45  			return nil, errors.Trace(err)
    46  		}
    47  		region.EndKey = decoded
    48  	}
    49  	return region, nil
    50  }