98 lines
2.9 KiB
Go
98 lines
2.9 KiB
Go
// Copyright 2016 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package tikv
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import (
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"context"
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"github.com/pingcap/errors"
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"github.com/pingcap/kvproto/pkg/metapb"
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"github.com/pingcap/pd/client"
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"github.com/pingcap/tidb/util/codec"
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)
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type codecPDClient struct {
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pd.Client
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}
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// GetRegion encodes the key before send requests to pd-server and decodes the
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// returned StartKey && EndKey from pd-server.
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func (c *codecPDClient) GetRegion(ctx context.Context, key []byte) (*metapb.Region, *metapb.Peer, error) {
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encodedKey := codec.EncodeBytes([]byte(nil), key)
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region, peer, err := c.Client.GetRegion(ctx, encodedKey)
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return processRegionResult(region, peer, err)
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}
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func (c *codecPDClient) GetPrevRegion(ctx context.Context, key []byte) (*metapb.Region, *metapb.Peer, error) {
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encodedKey := codec.EncodeBytes([]byte(nil), key)
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region, peer, err := c.Client.GetPrevRegion(ctx, encodedKey)
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return processRegionResult(region, peer, err)
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}
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// GetRegionByID encodes the key before send requests to pd-server and decodes the
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// returned StartKey && EndKey from pd-server.
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func (c *codecPDClient) GetRegionByID(ctx context.Context, regionID uint64) (*metapb.Region, *metapb.Peer, error) {
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region, peer, err := c.Client.GetRegionByID(ctx, regionID)
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return processRegionResult(region, peer, err)
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}
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func (c *codecPDClient) ScanRegions(ctx context.Context, startKey []byte, limit int) ([]*metapb.Region, []*metapb.Peer, error) {
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encodedKey := codec.EncodeBytes([]byte(nil), startKey)
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regions, peers, err := c.Client.ScanRegions(ctx, encodedKey, limit)
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if err != nil {
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return nil, nil, errors.Trace(err)
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}
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for _, region := range regions {
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if region != nil {
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err = decodeRegionMetaKey(region)
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if err != nil {
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return nil, nil, errors.Trace(err)
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}
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}
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}
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return regions, peers, nil
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}
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func processRegionResult(region *metapb.Region, peer *metapb.Peer, err error) (*metapb.Region, *metapb.Peer, error) {
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if err != nil {
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return nil, nil, errors.Trace(err)
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}
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if region == nil {
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return nil, nil, nil
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}
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err = decodeRegionMetaKey(region)
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if err != nil {
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return nil, nil, errors.Trace(err)
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}
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return region, peer, nil
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}
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func decodeRegionMetaKey(r *metapb.Region) error {
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if len(r.StartKey) != 0 {
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_, decoded, err := codec.DecodeBytes(r.StartKey, nil)
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if err != nil {
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return errors.Trace(err)
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}
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r.StartKey = decoded
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}
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if len(r.EndKey) != 0 {
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_, decoded, err := codec.DecodeBytes(r.EndKey, nil)
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if err != nil {
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return errors.Trace(err)
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}
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r.EndKey = decoded
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}
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return nil
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}
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