mirror of https://github.com/tikv/client-go.git
64 lines
2.1 KiB
Go
64 lines
2.1 KiB
Go
// Copyright 2018 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 locate
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import (
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"context"
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"github.com/pingcap/kvproto/pkg/metapb"
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pd "github.com/pingcap/pd/client"
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"github.com/tikv/client-go/codec"
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)
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// CodecPDClient wraps a PD Client to decode the encoded keys in region meta.
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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(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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// GetPrevRegion 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) GetPrevRegion(ctx context.Context, key []byte) (*metapb.Region, *metapb.Peer, error) {
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encodedKey := codec.EncodeBytes(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 decodes the 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 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, 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 = codec.DecodeRegionMetaKey(region)
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if err != nil {
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return nil, nil, err
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}
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return region, peer, nil
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}
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