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codec.go
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codec.go
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// Copyright 2018 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package locate
import (
"context"
"github.com/yiyanwannian/client-go/codec"
pd "github.com/tikv/pd/client"
)
// CodecPDClient wraps a PD Client to decode the encoded keys in region meta.
type CodecPDClient struct {
pd.Client
}
// GetRegion encodes the key before send requests to pd-server and decodes the
// returned StartKey && EndKey from pd-server.
func (c *CodecPDClient) GetRegion(ctx context.Context, key []byte) (*pd.Region, error) {
encodedKey := codec.EncodeBytes(key)
region, err := c.Client.GetRegion(ctx, encodedKey)
return processRegionResult(region, err)
}
// GetPrevRegion encodes the key before send requests to pd-server and decodes the
// returned StartKey && EndKey from pd-server.
func (c *CodecPDClient) GetPrevRegion(ctx context.Context, key []byte) (*pd.Region, error) {
encodedKey := codec.EncodeBytes(key)
region, err := c.Client.GetPrevRegion(ctx, encodedKey)
return processRegionResult(region, err)
}
// GetRegionByID decodes the returned StartKey && EndKey from pd-server.
func (c *CodecPDClient) GetRegionByID(ctx context.Context, regionID uint64) (*pd.Region, error) {
region, err := c.Client.GetRegionByID(ctx, regionID)
return processRegionResult(region, err)
}
func processRegionResult(region *pd.Region, err error) (*pd.Region, error) {
if err != nil {
return nil, err
}
if region == nil {
return nil, nil
}
err = codec.DecodeRegionMetaKey(region.Meta)
if err != nil {
return nil, err
}
return region, nil
}