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store/tikv: add raw kv api. (pingcap#2101)
* store/tikv: add raw kv api.
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_vendor/src/github.com/pingcap/kvproto/pkg/kvrpcpb/kvrpcpb.pb.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| // Copyright 2016 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 tikv | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| "github.com/juju/errors" | ||
| "github.com/pingcap/kvproto/pkg/kvrpcpb" | ||
| "github.com/pingcap/pd/pd-client" | ||
| ) | ||
|
|
||
| // RawKVClient is a client of TiKV server which is used as a key-value storage, | ||
| // only GET/PUT/DELETE commands are supported. | ||
| type RawKVClient struct { | ||
| clusterID uint64 | ||
| regionCache *RegionCache | ||
| rpcClient Client | ||
| } | ||
|
|
||
| // NewRawKVClient creates a client with PD cluster addrs. | ||
| func NewRawKVClient(pdAddrs []string) (*RawKVClient, error) { | ||
| pdCli, err := pd.NewClient(pdAddrs) | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| return &RawKVClient{ | ||
| clusterID: pdCli.GetClusterID(), | ||
| regionCache: NewRegionCache(pdCli), | ||
| rpcClient: newRPCClient(), | ||
| }, nil | ||
| } | ||
|
|
||
| // ClusterID returns the TiKV cluster ID. | ||
| func (c *RawKVClient) ClusterID() uint64 { | ||
| return c.clusterID | ||
| } | ||
|
|
||
| // Get queries value with the key. When the key does not exist, it returns | ||
| // `nil, nil`, while `[]byte{}, nil` means an empty value. | ||
| func (c *RawKVClient) Get(key []byte) ([]byte, error) { | ||
| req := &kvrpcpb.Request{ | ||
| Type: kvrpcpb.MessageType_CmdRawGet, | ||
| CmdRawGetReq: &kvrpcpb.CmdRawGetRequest{ | ||
| Key: key, | ||
| }, | ||
| } | ||
| resp, err := c.sendKVReq(key, req) | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| cmdResp := resp.GetCmdRawGetResp() | ||
| if cmdResp == nil { | ||
| return nil, errors.Trace(errBodyMissing) | ||
| } | ||
| if cmdResp.GetError() != "" { | ||
| return nil, errors.New(cmdResp.GetError()) | ||
| } | ||
| return cmdResp.Value, nil | ||
| } | ||
|
|
||
| // Put stores a key-value pair to TiKV. | ||
| func (c *RawKVClient) Put(key, value []byte) error { | ||
| req := &kvrpcpb.Request{ | ||
| Type: kvrpcpb.MessageType_CmdRawPut, | ||
| CmdRawPutReq: &kvrpcpb.CmdRawPutRequest{ | ||
| Key: key, | ||
| Value: value, | ||
| }, | ||
| } | ||
| resp, err := c.sendKVReq(key, req) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| cmdResp := resp.GetCmdRawPutResp() | ||
| if cmdResp == nil { | ||
| return errors.Trace(errBodyMissing) | ||
| } | ||
| if cmdResp.GetError() != "" { | ||
| return errors.New(cmdResp.GetError()) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // Delete deletes a key-value pair from TiKV. | ||
| func (c *RawKVClient) Delete(key []byte) error { | ||
| req := &kvrpcpb.Request{ | ||
| Type: kvrpcpb.MessageType_CmdRawDelete, | ||
| CmdRawDeleteReq: &kvrpcpb.CmdRawDeleteRequest{ | ||
| Key: key, | ||
| }, | ||
| } | ||
| resp, err := c.sendKVReq(key, req) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| cmdResp := resp.GetCmdRawDeleteResp() | ||
| if cmdResp == nil { | ||
| return errors.Trace(errBodyMissing) | ||
| } | ||
| if cmdResp.GetError() != "" { | ||
| return errors.New(cmdResp.GetError()) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (c *RawKVClient) sendKVReq(key []byte, req *kvrpcpb.Request) (*kvrpcpb.Response, error) { | ||
| bo := NewBackoffer(rawkvMaxBackoff, context.Background()) | ||
| for { | ||
| region, err := c.regionCache.GetRegion(bo, key) | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| resp, err := sendKVReq(c.regionCache, c.rpcClient, bo, req, region.VerID(), readTimeoutShort) | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| if regionErr := resp.GetRegionError(); regionErr != nil { | ||
| err := bo.Backoff(boRegionMiss, errors.New(regionErr.String())) | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| continue | ||
| } | ||
| return resp, nil | ||
| } | ||
| } |
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