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region_handler.go
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region_handler.go
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// Copyright 2017 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 server
import (
"bytes"
"encoding/hex"
"encoding/json"
"math"
"net/http"
"net/url"
"strconv"
"strings"
"time"
log "github.com/Sirupsen/logrus"
"github.com/gorilla/mux"
"github.com/juju/errors"
"github.com/pingcap/kvproto/pkg/kvrpcpb"
"github.com/pingcap/kvproto/pkg/metapb"
"github.com/pingcap/tidb"
"github.com/pingcap/tidb/context"
"github.com/pingcap/tidb/infoschema"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/model"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/store/tikv"
"github.com/pingcap/tidb/store/tikv/tikvrpc"
"github.com/pingcap/tidb/table"
"github.com/pingcap/tidb/tablecodec"
"github.com/pingcap/tidb/terror"
"github.com/pingcap/tidb/util/codec"
"github.com/pingcap/tidb/util/types"
goctx "golang.org/x/net/context"
)
const (
pDBName = "db"
pHexKey = "hexKey"
pIndexName = "index"
pHandle = "handle"
pRegionID = "regionID"
pStartTS = "startTS"
pTableName = "table"
)
// For query string
const qTableID = "table_id"
const (
headerContentType = "Content-Type"
contentTypeJSON = "application/json"
)
type kvStore interface {
GetRegionCache() *tikv.RegionCache
SendReq(bo *tikv.Backoffer, req *tikvrpc.Request, regionID tikv.RegionVerID, timeout time.Duration) (*tikvrpc.Response, error)
}
type regionHandlerTool struct {
bo *tikv.Backoffer
regionCache *tikv.RegionCache
store kvStore
}
// RegionHandler is the common field for http region handler. It contains
// some common functions for all handlers.
type regionHandler struct {
*regionHandlerTool
}
// schemaHandler is the handler for list database or table schemas.
type schemaHandler struct {
*regionHandler
}
// tableRegionsHandler is the handler for list table's regions.
type tableRegionsHandler struct {
*regionHandler
}
// MvccTxnHandler is the handler for txn debugger
type mvccTxnHandler struct {
*regionHandler
op string
}
const (
opMvccGetByHex = "hex"
opMvccGetByKey = "key"
opMvccGetByIdx = "idx"
opMvccGetByTxn = "txn"
)
// newRegionHandler checks and prepares for region handler.
// It would panic when any error happens.
func (s *Server) newRegionHandler() (hanler *regionHandler) {
var tikvStore kvStore
store, ok := s.driver.(*TiDBDriver)
if !ok {
panic("Invalid KvStore with illegal driver")
}
if tikvStore, ok = store.store.(kvStore); !ok {
panic("Invalid KvStore with illegal store")
}
regionCache := tikvStore.GetRegionCache()
// init backOffer && infoSchema.
backOffer := tikv.NewBackoffer(500, goctx.Background())
tool := ®ionHandlerTool{
regionCache: regionCache,
bo: backOffer,
store: tikvStore,
}
return ®ionHandler{tool}
}
// TableRegions is the response data for list table's regions.
// It contains regions list for record and indices.
type TableRegions struct {
TableName string `json:"name"`
TableID int64 `json:"id"`
RecordRegions []RegionMeta `json:"record_regions"`
Indices []IndexRegions `json:"indices"`
}
// RegionMeta contains a region's peer detail
type RegionMeta struct {
ID uint64 `json:"region_id"`
Leader *metapb.Peer `json:"leader"`
Peers []*metapb.Peer `json:"peers"`
RegionEpoch *metapb.RegionEpoch `json:"region_epoch"`
}
// IndexRegions is the region info for one index.
type IndexRegions struct {
Name string `json:"name"`
ID int64 `json:"id"`
Regions []RegionMeta `json:"regions"`
}
// RegionDetail is the response data for get region by ID
// it includes indices and records detail in current region.
type RegionDetail struct {
RegionID uint64 `json:"region_id"`
StartKey []byte `json:"start_key"`
EndKey []byte `json:"end_key"`
Frames []FrameItem `json:"frames"`
}
// addIndex insert a index into RegionDetail.
func (rt *RegionDetail) addIndex(dbName, tName string, tID int64, indexName string, indexID int64) {
rt.Frames = append(rt.Frames, FrameItem{
DBName: dbName,
TableName: tName,
TableID: tID,
IndexName: indexName,
IndexID: indexID,
IsRecord: false,
})
}
// addRecord insert a table's record into RegionDetail.
func (rt *RegionDetail) addRecord(dbName, tName string, tID int64) {
rt.Frames = append(rt.Frames, FrameItem{
DBName: dbName,
TableName: tName,
TableID: tID,
IsRecord: true,
})
}
// addTableInRange insert a table into RegionDetail
// with index's id in range [startID,endID]. Table's
// record would be included when endID is MaxInt64.
func (rt *RegionDetail) addTableInRange(dbName string, curTable *model.TableInfo, startID, endID int64) {
tName := curTable.Name.String()
tID := curTable.ID
for _, index := range curTable.Indices {
if index.ID >= startID && index.ID <= endID {
rt.addIndex(
dbName,
tName,
tID,
index.Name.String(),
index.ID)
}
}
if endID == math.MaxInt64 {
rt.addRecord(dbName, tName, tID)
}
}
// FrameItem includes a index's or record's meta data with table's info.
type FrameItem struct {
DBName string `json:"db_name"`
TableName string `json:"table_name"`
TableID int64 `json:"table_id"`
IsRecord bool `json:"is_record"`
IndexName string `json:"index_name,omitempty"`
IndexID int64 `json:"index_id,omitempty"`
}
// RegionFrameRange contains a frame range info which the region covered.
type RegionFrameRange struct {
first *FrameItem // start frame of the region
last *FrameItem // end frame of the region
region *tikv.KeyLocation // the region
}
func (t *regionHandlerTool) getRegionsMeta(regionIDs []uint64) ([]RegionMeta, error) {
regions := make([]RegionMeta, len(regionIDs))
for i, regionID := range regionIDs {
meta, leader, err := t.regionCache.PDClient().GetRegionByID(goctx.TODO(), regionID)
if err != nil {
return nil, errors.Trace(err)
}
regions[i] = RegionMeta{
ID: regionID,
Leader: leader,
Peers: meta.Peers,
RegionEpoch: meta.RegionEpoch,
}
}
return regions, nil
}
// ServeHTTP handles request of list a database or table's schemas.
func (rh schemaHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
schema, err := rh.schema()
if err != nil {
rh.writeError(w, err)
return
}
// parse params
params := mux.Vars(req)
if dbName, ok := params[pDBName]; ok {
cDBName := model.NewCIStr(dbName)
if tableName, ok := params[pTableName]; ok {
// table schema of a specified table name
cTableName := model.NewCIStr(tableName)
data, err := schema.TableByName(cDBName, cTableName)
if err != nil {
rh.writeError(w, err)
return
}
rh.writeData(w, data.Meta())
return
}
// all table schemas in a specified database
if schema.SchemaExists(cDBName) {
tbs := schema.SchemaTables(cDBName)
tbsInfo := make([]*model.TableInfo, len(tbs))
for i := range tbsInfo {
tbsInfo[i] = tbs[i].Meta()
}
rh.writeData(w, tbsInfo)
return
}
rh.writeError(w, infoschema.ErrDatabaseNotExists.GenByArgs(dbName))
return
}
if tableID := req.FormValue(qTableID); len(tableID) > 0 {
// table schema of a specified tableID
tid, err := strconv.Atoi(tableID)
if err != nil {
rh.writeError(w, err)
return
}
if tid < 0 {
rh.writeError(w, infoschema.ErrTableNotExists.Gen("Table which ID = %s does not exist.", tableID))
return
}
if data, ok := schema.TableByID(int64(tid)); ok {
rh.writeData(w, data.Meta())
return
}
rh.writeError(w, infoschema.ErrTableNotExists.Gen("Table which ID = %s does not exist.", tableID))
return
}
// all databases' schemas
rh.writeData(w, schema.AllSchemas())
return
}
// ServeHTTP handles request of list a table's regions.
func (rh tableRegionsHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
// parse params
params := mux.Vars(req)
dbName := params[pDBName]
tableName := params[pTableName]
schema, err := rh.schema()
if err != nil {
rh.writeError(w, err)
return
}
// get table's schema.
table, err := schema.TableByName(model.NewCIStr(dbName), model.NewCIStr(tableName))
if err != nil {
rh.writeError(w, err)
return
}
tableID := table.Meta().ID
// for record
startKey, endKey := tablecodec.GetTableHandleKeyRange(tableID)
recordRegionIDs, err := rh.regionCache.ListRegionIDsInKeyRange(rh.bo, startKey, endKey)
if err != nil {
rh.writeError(w, err)
return
}
recordRegions, err := rh.getRegionsMeta(recordRegionIDs)
if err != nil {
rh.writeError(w, err)
return
}
// for indices
indices := make([]IndexRegions, len(table.Indices()))
for i, index := range table.Indices() {
indexID := index.Meta().ID
indices[i].Name = index.Meta().Name.String()
indices[i].ID = indexID
startKey, endKey := tablecodec.GetTableIndexKeyRange(tableID, indexID)
rIDs, err := rh.regionCache.ListRegionIDsInKeyRange(rh.bo, startKey, endKey)
if err != nil {
rh.writeError(w, err)
return
}
indices[i].Regions, err = rh.getRegionsMeta(rIDs)
if err != nil {
rh.writeError(w, err)
return
}
}
tableRegions := &TableRegions{
TableName: tableName,
TableID: tableID,
Indices: indices,
RecordRegions: recordRegions,
}
rh.writeData(w, tableRegions)
}
// ServeHTTP handles request of get region by ID.
func (rh regionHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
// parse and check params
params := mux.Vars(req)
if _, ok := params[pRegionID]; !ok {
startKey := []byte{'m'}
endKey := []byte{'n'}
recordRegionIDs, err := rh.regionCache.ListRegionIDsInKeyRange(rh.bo, startKey, endKey)
if err != nil {
rh.writeError(w, err)
return
}
recordRegions, err := rh.getRegionsMeta(recordRegionIDs)
if err != nil {
rh.writeError(w, err)
return
}
rh.writeData(w, recordRegions)
return
}
regionIDInt, err := strconv.ParseInt(params[pRegionID], 0, 64)
if err != nil {
rh.writeError(w, err)
return
}
regionID := uint64(regionIDInt)
// locate region
region, err := rh.regionCache.LocateRegionByID(rh.bo, regionID)
if err != nil {
rh.writeError(w, err)
return
}
frameRange, err := NewRegionFrameRange(region)
if err != nil {
rh.writeError(w, err)
return
}
// create RegionDetail from RegionFrameRange
regionDetail := &RegionDetail{
RegionID: regionID,
StartKey: region.StartKey,
EndKey: region.EndKey,
}
schema, err := rh.schema()
if err != nil {
rh.writeError(w, err)
return
}
// Since we need a database's name for each frame, and a table's database name can not
// get from table's ID directly. Above all, here do dot process like
// `for id in [frameRange.firstTableID,frameRange.endTableID]`
// on [frameRange.firstTableID,frameRange.endTableID] is small enough.
for _, db := range schema.AllSchemas() {
for _, table := range db.Tables {
start, end := frameRange.getIndexRangeForTable(table.ID)
regionDetail.addTableInRange(db.Name.String(), table, start, end)
}
}
rh.writeData(w, regionDetail)
}
func (rh *regionHandler) writeError(w http.ResponseWriter, err error) {
w.WriteHeader(http.StatusBadRequest)
_, err = w.Write([]byte(err.Error()))
terror.Log(errors.Trace(err))
}
func (rh *regionHandler) writeData(w http.ResponseWriter, data interface{}) {
js, err := json.Marshal(data)
if err != nil {
rh.writeError(w, err)
return
}
log.Info(string(js))
// write response
w.Header().Set(headerContentType, contentTypeJSON)
w.WriteHeader(http.StatusOK)
_, err = w.Write(js)
terror.Log(errors.Trace(err))
}
// NewFrameItemFromRegionKey creates a FrameItem with region's startKey or endKey,
// returns err when key is illegal.
func NewFrameItemFromRegionKey(key []byte) (frame *FrameItem, err error) {
_, key, err = codec.DecodeBytes(key)
if err != nil {
return
}
frame = &FrameItem{}
frame.TableID, frame.IndexID, frame.IsRecord, err = tablecodec.DecodeKeyHead(key)
if err == nil || bytes.HasPrefix(key, tablecodec.TablePrefix()) {
return
}
// key start with tablePrefix must be either record key or index key
// That's means table's record key and index key are always together
// in the continuous interval. And for key with prefix smaller than
// tablePrefix, is smaller than all tables. While for key with prefix
// bigger than tablePrefix, means is bigger than all tables.
err = nil
if bytes.Compare(key, tablecodec.TablePrefix()) < 0 {
frame.TableID = math.MinInt64
frame.IndexID = math.MinInt64
frame.IsRecord = false
return
}
// bigger than tablePrefix, means is bigger than all tables.
frame.TableID = math.MaxInt64
frame.TableID = math.MaxInt64
frame.IsRecord = true
return
}
// NewRegionFrameRange init a NewRegionFrameRange with region info.
func NewRegionFrameRange(region *tikv.KeyLocation) (idxRange *RegionFrameRange, err error) {
var first, last *FrameItem
// check and init first frame
if len(region.StartKey) > 0 {
first, err = NewFrameItemFromRegionKey(region.StartKey)
if err != nil {
return
}
} else { // empty startKey means start with -infinite
first = &FrameItem{
IndexID: int64(math.MinInt64),
IsRecord: false,
TableID: int64(math.MinInt64),
}
}
// check and init last frame
if len(region.EndKey) > 0 {
last, err = NewFrameItemFromRegionKey(region.EndKey)
if err != nil {
return
}
} else { // empty endKey means end with +infinite
last = &FrameItem{
TableID: int64(math.MaxInt64),
IndexID: int64(math.MaxInt64),
IsRecord: true,
}
}
idxRange = &RegionFrameRange{
region: region,
first: first,
last: last,
}
return idxRange, nil
}
// getFirstIdxIdRange return the first table's index range.
// 1. [start,end] means index id in [start,end] are needed,while record key is not in.
// 2. [start,~) means index's id in [start,~) are needed including record key index.
// 3. (~,~) means only record key index is needed
func (ir *RegionFrameRange) getFirstIdxIDRange() (start, end int64) {
start = int64(math.MinInt64)
end = int64(math.MaxInt64)
if ir.first.IsRecord {
start = end // need record key only,
return
}
start = ir.first.IndexID
if ir.first.TableID != ir.last.TableID || ir.last.IsRecord {
return // [start,~)
}
end = ir.last.IndexID // [start,end]
return
}
// getLastInxIdRange return the last table's index range.
// (~,end] means index's id in (~,end] are legal, record key index not included.
// (~,~) means all indexes are legal include record key index.
func (ir *RegionFrameRange) getLastInxIDRange() (start, end int64) {
start = int64(math.MinInt64)
end = int64(math.MaxInt64)
if ir.last.IsRecord {
return
}
end = ir.last.IndexID
return
}
// getIndexRangeForTable return the legal index range for table with tableID.
// end=math.MaxInt64 means record key index is included.
func (ir *RegionFrameRange) getIndexRangeForTable(tableID int64) (start, end int64) {
switch tableID {
case ir.firstTableID():
return ir.getFirstIdxIDRange()
case ir.lastTableID():
return ir.getLastInxIDRange()
default:
if tableID < ir.lastTableID() && tableID > ir.firstTableID() {
return int64(math.MinInt64), int64(math.MaxInt64)
}
}
return int64(math.MaxInt64), int64(math.MinInt64)
}
func (ir RegionFrameRange) firstTableID() int64 {
return ir.first.TableID
}
func (ir RegionFrameRange) lastTableID() int64 {
return ir.last.TableID
}
// parseQuery is used to parse query string in URL, due to golang http package can not distinguish
// query like "?a=" and "?a". We rewrite it to separate these two queries. e.g.
// "?a=" which means that a is an empty string "";
// "?a" which means that a is null.
func parseQuery(query string, m url.Values) error {
var err error
for query != "" {
key := query
if i := strings.IndexAny(key, "&;"); i >= 0 {
key, query = key[:i], key[i+1:]
} else {
query = ""
}
if key == "" {
continue
}
if i := strings.Index(key, "="); i >= 0 {
value := ""
key, value = key[:i], key[i+1:]
key, err = url.QueryUnescape(key)
if err != nil {
return errors.Trace(err)
}
value, err = url.QueryUnescape(value)
if err != nil {
return errors.Trace(err)
}
m[key] = append(m[key], value)
} else {
key, err = url.QueryUnescape(key)
if err != nil {
return errors.Trace(err)
}
if _, ok := m[key]; !ok {
m[key] = nil
}
}
}
return errors.Trace(err)
}
// ServeHTTP handles request of list a table's regions.
func (rh mvccTxnHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
var data interface{}
params := mux.Vars(req)
var err error
switch rh.op {
case opMvccGetByHex:
data, err = rh.handleMvccGetByHex(params)
case opMvccGetByIdx:
if req.URL == nil {
err = errors.BadRequestf("Invalid URL")
break
}
values := make(url.Values)
err = parseQuery(req.URL.RawQuery, values)
if err == nil {
data, err = rh.handleMvccGetByIdx(params, values)
}
case opMvccGetByKey:
data, err = rh.handleMvccGetByKey(params)
case opMvccGetByTxn:
data, err = rh.handleMvccGetByTxn(params)
default:
err = errors.NotSupportedf("Operation not supported.")
}
if err != nil {
rh.writeError(w, err)
} else {
rh.writeData(w, data)
}
}
// handleMvccGetByIdx gets MVCC info by an index key.
func (rh mvccTxnHandler) handleMvccGetByIdx(params map[string]string, values url.Values) (interface{}, error) {
dbName := params[pDBName]
tableName := params[pTableName]
handleStr := params[pHandle]
schema, err := rh.schema()
if err != nil {
return nil, errors.Trace(err)
}
// get table's schema.
t, err := schema.TableByName(model.NewCIStr(dbName), model.NewCIStr(tableName))
if err != nil {
return nil, errors.Trace(err)
}
var idxCols []*model.ColumnInfo
var idx table.Index
for _, v := range t.Indices() {
if strings.EqualFold(v.Meta().Name.String(), params[pIndexName]) {
for _, c := range v.Meta().Columns {
idxCols = append(idxCols, t.Meta().Columns[c.Offset])
}
idx = v
break
}
}
if idx == nil {
return nil, errors.NotFoundf("Index %s not found!", params[pIndexName])
}
return rh.getMvccByIdxValue(idx, values, idxCols, handleStr)
}
func (rh mvccTxnHandler) handleMvccGetByKey(params map[string]string) (interface{}, error) {
handle, err := strconv.ParseInt(params[pHandle], 0, 64)
if err != nil {
return nil, errors.Trace(err)
}
tableID, err := rh.getTableID(params[pDBName], params[pTableName])
if err != nil {
return nil, errors.Trace(err)
}
return rh.getMvccByHandle(tableID, handle)
}
func (rh *mvccTxnHandler) handleMvccGetByTxn(params map[string]string) (interface{}, error) {
startTS, err := strconv.ParseInt(params[pStartTS], 0, 64)
if err != nil {
return nil, errors.Trace(err)
}
startKey := []byte("")
endKey := []byte("")
dbName := params[pDBName]
if len(dbName) > 0 {
tableID, err := rh.getTableID(params[pDBName], params[pTableName])
if err != nil {
return nil, errors.Trace(err)
}
startKey = tablecodec.EncodeTablePrefix(tableID)
endKey = tablecodec.EncodeRowKeyWithHandle(tableID, math.MaxInt64)
}
return rh.getMvccByStartTs(uint64(startTS), startKey, endKey)
}
func (t *regionHandlerTool) getMvccByEncodedKey(encodedKey kv.Key) (*kvrpcpb.MvccGetByKeyResponse, error) {
keyLocation, err := t.regionCache.LocateKey(t.bo, encodedKey)
if err != nil {
return nil, errors.Trace(err)
}
tikvReq := &tikvrpc.Request{
Type: tikvrpc.CmdMvccGetByKey,
MvccGetByKey: &kvrpcpb.MvccGetByKeyRequest{
Key: encodedKey,
},
}
kvResp, err := t.store.SendReq(t.bo, tikvReq, keyLocation.Region, time.Minute)
log.Info(string(encodedKey), keyLocation.Region, string(keyLocation.StartKey), string(keyLocation.EndKey), kvResp, err)
if err != nil {
return nil, errors.Trace(err)
}
return kvResp.MvccGetByKey, nil
}
func (t *regionHandlerTool) getMvccByHandle(tableID, handle int64) (*kvrpcpb.MvccGetByKeyResponse, error) {
encodedKey := tablecodec.EncodeRowKeyWithHandle(tableID, handle)
return t.getMvccByEncodedKey(encodedKey)
}
func (t *regionHandlerTool) getMvccByStartTs(startTS uint64, startKey, endKey []byte) (*kvrpcpb.MvccGetByStartTsResponse, error) {
for {
curRegion, err := t.regionCache.LocateKey(t.bo, startKey)
if err != nil {
log.Error(startTS, startKey, err)
return nil, errors.Trace(err)
}
tikvReq := &tikvrpc.Request{
Type: tikvrpc.CmdMvccGetByStartTs,
MvccGetByStartTs: &kvrpcpb.MvccGetByStartTsRequest{
StartTs: startTS,
},
}
tikvReq.Context.Priority = kvrpcpb.CommandPri_Low
kvResp, err := t.store.SendReq(t.bo, tikvReq, curRegion.Region, time.Hour)
log.Info(startTS, string(startKey), curRegion.Region, string(curRegion.StartKey), string(curRegion.EndKey), kvResp)
if err != nil {
log.Error(startTS, string(startKey), curRegion.Region, string(curRegion.StartKey), string(curRegion.EndKey), err)
return nil, errors.Trace(err)
}
data := kvResp.MvccGetByStartTS
if err := data.GetRegionError(); err != nil {
log.Warn(startTS, string(startKey), curRegion.Region, string(curRegion.StartKey), string(curRegion.EndKey), err)
continue
}
if len(data.GetError()) > 0 {
log.Error(startTS, string(startKey), curRegion.Region, string(curRegion.StartKey), string(curRegion.EndKey), data.GetError())
return nil, errors.New(data.GetError())
}
key := data.GetKey()
if len(key) > 0 {
return data, nil
}
if len(endKey) > 0 && curRegion.Contains(endKey) {
return nil, nil
}
if len(curRegion.EndKey) == 0 {
return nil, nil
}
startKey = curRegion.EndKey
}
}
func (t *regionHandlerTool) getMvccByIdxValue(idx table.Index, values url.Values, idxCols []*model.ColumnInfo, handleStr string) (*kvrpcpb.MvccGetByKeyResponse, error) {
idxRow, err := t.formValue2DatumRow(values, idxCols)
if err != nil {
return nil, errors.Trace(err)
}
handle, err := strconv.ParseInt(handleStr, 10, 64)
if err != nil {
return nil, errors.Trace(err)
}
encodedKey, _, err := idx.GenIndexKey(idxRow, handle)
if err != nil {
return nil, errors.Trace(err)
}
return t.getMvccByEncodedKey(encodedKey)
}
// formValue2DatumRow converts URL query string to a Datum Row.
func (t *regionHandlerTool) formValue2DatumRow(values url.Values, idxCols []*model.ColumnInfo) ([]types.Datum, error) {
data := make([]types.Datum, len(idxCols))
sc := new(variable.StatementContext)
sc.TimeZone = time.UTC
for i, col := range idxCols {
colName := col.Name.String()
vals, ok := values[colName]
if !ok {
return nil, errors.BadRequestf("Missing value for index column %s.", colName)
}
switch len(vals) {
case 0:
data[i].SetNull()
case 1:
bDatum := types.NewStringDatum(vals[0])
cDatum, err := bDatum.ConvertTo(sc, &col.FieldType)
if err != nil {
return nil, errors.Trace(err)
}
data[i] = cDatum
default:
return nil, errors.BadRequestf("Invalid query form for column '%s', it's values are %v."+
" Column value should be unique for one index record.", colName, vals)
}
}
return data, nil
}
func (t *regionHandlerTool) getTableID(dbName, tableName string) (int64, error) {
schema, err := t.schema()
if err != nil {
return 0, errors.Trace(err)
}
table, err := schema.TableByName(model.NewCIStr(dbName), model.NewCIStr(tableName))
if err != nil {
return 0, errors.Trace(err)
}
return table.Meta().ID, nil
}
func (t *regionHandlerTool) schema() (infoschema.InfoSchema, error) {
session, err := tidb.CreateSession(t.store.(kv.Storage))
if err != nil {
return nil, errors.Trace(err)
}
return sessionctx.GetDomain(session.(context.Context)).InfoSchema(), nil
}
func (t *regionHandlerTool) handleMvccGetByHex(params map[string]string) (interface{}, error) {
encodedKey, err := hex.DecodeString(params[pHexKey])
if err != nil {
return nil, errors.Trace(err)
}
return t.getMvccByEncodedKey(encodedKey)
}