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http_handler.go
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http_handler.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 server
import (
"bytes"
"encoding/base64"
"encoding/hex"
"encoding/json"
"fmt"
"math"
"net/http"
"net/url"
"strconv"
"strings"
"sync/atomic"
"time"
"github.com/gorilla/mux"
"github.com/juju/errors"
"github.com/pingcap/kvproto/pkg/kvrpcpb"
"github.com/pingcap/kvproto/pkg/metapb"
"github.com/pingcap/tidb/config"
"github.com/pingcap/tidb/domain"
"github.com/pingcap/tidb/infoschema"
"github.com/pingcap/tidb/kv"
"github.com/pingcap/tidb/meta"
"github.com/pingcap/tidb/model"
"github.com/pingcap/tidb/session"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/sessionctx/binloginfo"
"github.com/pingcap/tidb/sessionctx/stmtctx"
"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/types"
"github.com/pingcap/tidb/util/codec"
log "github.com/sirupsen/logrus"
"golang.org/x/net/context"
)
const (
pDBName = "db"
pHexKey = "hexKey"
pIndexName = "index"
pHandle = "handle"
pRegionID = "regionID"
pStartTS = "startTS"
pTableName = "table"
pColumnID = "colID"
pColumnTp = "colTp"
pColumnFlag = "colFlag"
pColumnLen = "colLen"
pRowBin = "rowBin"
)
// For query string
const qTableID = "table_id"
const qLimit = "limit"
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)
}
func writeError(w http.ResponseWriter, err error) {
w.WriteHeader(http.StatusBadRequest)
_, err = w.Write([]byte(err.Error()))
terror.Log(errors.Trace(err))
}
func writeData(w http.ResponseWriter, data interface{}) {
js, err := json.Marshal(data)
if err != nil {
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))
}
type tikvHandlerTool struct {
regionCache *tikv.RegionCache
store kvStore
}
// newTikvHandlerTool checks and prepares for tikv handler.
// It would panic when any error happens.
func (s *Server) newTikvHandlerTool() *tikvHandlerTool {
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()
return &tikvHandlerTool{
regionCache: regionCache,
store: tikvStore,
}
}
func (t *tikvHandlerTool) getMvccByEncodedKey(encodedKey kv.Key) (*kvrpcpb.MvccGetByKeyResponse, error) {
keyLocation, err := t.regionCache.LocateKey(tikv.NewBackoffer(context.Background(), 500), 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(tikv.NewBackoffer(context.Background(), 500), 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 *tikvHandlerTool) getMvccByHandle(tableID, handle int64) (*kvrpcpb.MvccGetByKeyResponse, error) {
encodedKey := tablecodec.EncodeRowKeyWithHandle(tableID, handle)
return t.getMvccByEncodedKey(encodedKey)
}
func (t *tikvHandlerTool) getMvccByStartTs(startTS uint64, startKey, endKey []byte) (*kvrpcpb.MvccGetByStartTsResponse, error) {
bo := tikv.NewBackoffer(context.Background(), 5000)
for {
curRegion, err := t.regionCache.LocateKey(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(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 *tikvHandlerTool) getMvccByIdxValue(idx table.Index, values url.Values, idxCols []*model.ColumnInfo, handleStr string) (*kvrpcpb.MvccGetByKeyResponse, error) {
sc := new(stmtctx.StatementContext)
// HTTP request is not a database session, set timezone to UTC directly here.
// See https://github.com/pingcap/tidb/blob/master/docs/tidb_http_api.md for more details.
sc.TimeZone = time.UTC
idxRow, err := t.formValue2DatumRow(sc, 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(sc, idxRow, handle, nil)
if err != nil {
return nil, errors.Trace(err)
}
return t.getMvccByEncodedKey(encodedKey)
}
// formValue2DatumRow converts URL query string to a Datum Row.
func (t *tikvHandlerTool) formValue2DatumRow(sc *stmtctx.StatementContext, values url.Values, idxCols []*model.ColumnInfo) ([]types.Datum, error) {
data := make([]types.Datum, len(idxCols))
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 *tikvHandlerTool) getTableID(dbName, tableName string) (int64, error) {
schema, err := t.schema()
if err != nil {
return 0, errors.Trace(err)
}
tableVal, err := schema.TableByName(model.NewCIStr(dbName), model.NewCIStr(tableName))
if err != nil {
return 0, errors.Trace(err)
}
return tableVal.Meta().ID, nil
}
func (t *tikvHandlerTool) schema() (infoschema.InfoSchema, error) {
session, err := session.CreateSession(t.store.(kv.Storage))
if err != nil {
return nil, errors.Trace(err)
}
return domain.GetDomain(session.(sessionctx.Context)).InfoSchema(), nil
}
func (t *tikvHandlerTool) 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)
}
func (t *tikvHandlerTool) getAllHistoryDDL() ([]*model.Job, error) {
s, err := session.CreateSession(t.store.(kv.Storage))
if err != nil {
return nil, errors.Trace(err)
}
if s != nil {
defer s.Close()
}
store := domain.GetDomain(s.(sessionctx.Context)).Store()
txn, err := store.Begin()
if err != nil {
return nil, errors.Trace(err)
}
txnMeta := meta.NewMeta(txn)
jobs, err := txnMeta.GetAllHistoryDDLJobs()
if err != nil {
return nil, errors.Trace(err)
}
return jobs, nil
}
// settingsHandler is the handler for list tidb server settings.
type settingsHandler struct {
}
// binlogRecover is used to recover binlog service.
// When config binlog IgnoreError, binlog service will stop after meeting the first error.
// It can be recovered using HTTP API.
type binlogRecover struct{}
// schemaHandler is the handler for list database or table schemas.
type schemaHandler struct {
*tikvHandlerTool
}
// regionHandler is the common field for http handler. It contains
// some common functions for all handlers.
type regionHandler struct {
*tikvHandlerTool
}
// tableHandler is the handler for list table's regions.
type tableHandler struct {
*tikvHandlerTool
op string
}
// ddlHistoryJobHandler is the handler for list job history.
type ddlHistoryJobHandler struct {
*tikvHandlerTool
}
// valueHandle is the handler for get value.
type valueHandler struct {
}
const (
opTableRegions = "regions"
opTableDiskUsage = "disk-usage"
opTableScatter = "scatter-table"
opStopTableScatter = "stop-scatter-table"
)
// mvccTxnHandler is the handler for txn debugger
type mvccTxnHandler struct {
*tikvHandlerTool
op string
}
const (
opMvccGetByHex = "hex"
opMvccGetByKey = "key"
opMvccGetByIdx = "idx"
opMvccGetByTxn = "txn"
)
// ServeHTTP handles request of list a database or table's schemas.
func (vh valueHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
// parse params
params := mux.Vars(req)
colID, err := strconv.ParseInt(params[pColumnID], 0, 64)
if err != nil {
writeError(w, err)
return
}
colTp, err := strconv.ParseInt(params[pColumnTp], 0, 64)
if err != nil {
writeError(w, err)
return
}
colFlag, err := strconv.ParseUint(params[pColumnFlag], 0, 64)
if err != nil {
writeError(w, err)
return
}
colLen, err := strconv.ParseInt(params[pColumnLen], 0, 64)
if err != nil {
writeError(w, err)
return
}
// Get the unchanged binary.
if req.URL == nil {
err = errors.BadRequestf("Invalid URL")
writeError(w, err)
return
}
values := make(url.Values)
shouldUnescape := false
err = parseQuery(req.URL.RawQuery, values, shouldUnescape)
if err != nil {
writeError(w, err)
return
}
if len(values[pRowBin]) != 1 {
err = errors.BadRequestf("Invalid Query:%v", values[pRowBin])
writeError(w, err)
return
}
bin := values[pRowBin][0]
valData, err := base64.StdEncoding.DecodeString(bin)
if err != nil {
writeError(w, err)
return
}
// Construct field type.
defaultDecimal := 6
ft := &types.FieldType{
Tp: byte(colTp),
Flag: uint(colFlag),
Flen: int(colLen),
Decimal: defaultDecimal,
}
// Decode a column.
m := make(map[int64]*types.FieldType, 1)
m[int64(colID)] = ft
loc := time.UTC
vals, err := tablecodec.DecodeRow(valData, m, loc)
if err != nil {
writeError(w, err)
return
}
v := vals[int64(colID)]
val, err := v.ToString()
if err != nil {
writeError(w, err)
return
}
writeData(w, val)
return
}
// 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"`
}
// addTableInRange insert a table into RegionDetail
// with index's id or record in the range if r.
func (rt *RegionDetail) addTableInRange(dbName string, curTable *model.TableInfo, r *RegionFrameRange) {
tName := curTable.Name.String()
tID := curTable.ID
for _, index := range curTable.Indices {
if f := r.getIndexFrame(tID, index.ID, dbName, tName, index.Name.String()); f != nil {
rt.Frames = append(rt.Frames, f)
}
}
if f := r.getRecordFrame(tID, dbName, tName); f != nil {
rt.Frames = append(rt.Frames, f)
}
}
// 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"`
RecordID int64 `json:"record_id,omitempty"`
IndexName string `json:"index_name,omitempty"`
IndexID int64 `json:"index_id,omitempty"`
IndexValues []string `json:"index_values,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 *tikvHandlerTool) getRegionsMeta(regionIDs []uint64) ([]RegionMeta, error) {
regions := make([]RegionMeta, len(regionIDs))
for i, regionID := range regionIDs {
meta, leader, err := t.regionCache.PDClient().GetRegionByID(context.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 tidb server settings.
func (h settingsHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
if req.Method == "POST" {
err := req.ParseForm()
if err != nil {
writeError(w, err)
return
}
if levelStr := req.Form.Get("log_level"); levelStr != "" {
l, err1 := log.ParseLevel(levelStr)
if err1 != nil {
writeError(w, err1)
return
}
log.SetLevel(l)
config.GetGlobalConfig().Log.Level = levelStr
}
if generalLog := req.Form.Get("tidb_general_log"); generalLog != "" {
switch generalLog {
case "0":
atomic.StoreUint32(&variable.ProcessGeneralLog, 0)
case "1":
atomic.StoreUint32(&variable.ProcessGeneralLog, 1)
default:
writeError(w, errors.New("illegal argument"))
return
}
}
} else {
writeData(w, config.GetGlobalConfig())
}
return
}
// ServeHTTP recovers binlog service.
func (h binlogRecover) ServeHTTP(w http.ResponseWriter, req *http.Request) {
binloginfo.DisableSkipBinlogFlag()
}
// ServeHTTP handles request of list a database or table's schemas.
func (h schemaHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
schema, err := h.schema()
if err != nil {
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 {
writeError(w, err)
return
}
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()
}
writeData(w, tbsInfo)
return
}
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 {
writeError(w, err)
return
}
if tid < 0 {
writeError(w, infoschema.ErrTableNotExists.Gen("Table which ID = %s does not exist.", tableID))
return
}
if data, ok := schema.TableByID(int64(tid)); ok {
writeData(w, data.Meta())
return
}
writeError(w, infoschema.ErrTableNotExists.Gen("Table which ID = %s does not exist.", tableID))
return
}
// all databases' schemas
writeData(w, schema.AllSchemas())
return
}
// ServeHTTP handles table related requests, such as table's region information, disk usage.
func (h tableHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
// parse params
params := mux.Vars(req)
dbName := params[pDBName]
tableName := params[pTableName]
schema, err := h.schema()
if err != nil {
writeError(w, err)
return
}
// get table's schema.
tableVal, err := schema.TableByName(model.NewCIStr(dbName), model.NewCIStr(tableName))
if err != nil {
writeError(w, err)
return
}
switch h.op {
case opTableRegions:
h.handleRegionRequest(schema, tableVal, w, req)
case opTableDiskUsage:
h.handleDiskUsageRequest(schema, tableVal, w, req)
case opTableScatter:
h.handleScatterTableRequest(schema, tableVal, w, req)
case opStopTableScatter:
h.handleStopScatterTableRequest(schema, tableVal, w, req)
default:
writeError(w, errors.New("method not found"))
}
}
// ServeHTTP handles request of ddl jobs history.
func (h ddlHistoryJobHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
if limitID := req.FormValue(qLimit); len(limitID) > 0 {
lid, err := strconv.Atoi(limitID)
if err != nil {
writeError(w, err)
return
}
if lid < 1 {
writeError(w, errors.New("ddl history limit must be greater than 1"))
return
}
jobs, err := h.getAllHistoryDDL()
if err != nil {
writeError(w, errors.New("ddl history not found"))
return
}
jobsLen := len(jobs)
if jobsLen > lid {
start := jobsLen - lid
jobs = jobs[start:]
}
writeData(w, jobs)
return
}
jobs, err := h.getAllHistoryDDL()
if err != nil {
writeError(w, errors.New("ddl history not found"))
return
}
writeData(w, jobs)
return
}
func (h tableHandler) getPDAddr() ([]string, error) {
var pdAddrs []string
etcd, ok := h.store.(domain.EtcdBackend)
if !ok {
return nil, errors.New("not implemented")
}
pdAddrs = etcd.EtcdAddrs()
if len(pdAddrs) < 0 {
return nil, errors.New("pd unavailable")
}
return pdAddrs, nil
}
func (h tableHandler) addScatterSchedule(startKey, endKey []byte, name string) error {
pdAddrs, err := h.getPDAddr()
if err != nil {
return err
}
input := map[string]string{
"name": "scatter-range",
"start_key": url.QueryEscape(string(startKey)),
"end_key": url.QueryEscape(string(endKey)),
"range_name": name,
}
v, err := json.Marshal(input)
if err != nil {
return err
}
scheduleURL := fmt.Sprintf("http://%s/pd/api/v1/schedulers", pdAddrs[0])
resp, err := http.Post(scheduleURL, "application/json", bytes.NewBuffer(v))
if err != nil {
return err
}
if err := resp.Body.Close(); err != nil {
log.Error(err)
}
return nil
}
func (h tableHandler) deleteScatterSchedule(name string) error {
pdAddrs, err := h.getPDAddr()
if err != nil {
return err
}
scheduleURL := fmt.Sprintf("http://%s/pd/api/v1/schedulers/scatter-range-%s", pdAddrs[0], name)
req, err := http.NewRequest(http.MethodDelete, scheduleURL, nil)
if err != nil {
return err
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
if err := resp.Body.Close(); err != nil {
log.Error(err)
}
return nil
}
func (h tableHandler) handleScatterTableRequest(schema infoschema.InfoSchema, tbl table.Table, w http.ResponseWriter, req *http.Request) {
// for record
tableID := tbl.Meta().ID
startKey, endKey := tablecodec.GetTableHandleKeyRange(tableID)
startKey = codec.EncodeBytes([]byte{}, startKey)
endKey = codec.EncodeBytes([]byte{}, endKey)
tableName := tbl.Meta().Name.String()
err := h.addScatterSchedule(startKey, endKey, tableName)
if err != nil {
writeError(w, errors.Annotate(err, "scatter record error"))
return
}
// for indices
for _, index := range tbl.Indices() {
indexID := index.Meta().ID
indexName := index.Meta().Name.String()
startKey, endKey := tablecodec.GetTableIndexKeyRange(tableID, indexID)
startKey = codec.EncodeBytes([]byte{}, startKey)
endKey = codec.EncodeBytes([]byte{}, endKey)
name := tableName + "-" + indexName
err := h.addScatterSchedule(startKey, endKey, name)
if err != nil {
writeError(w, errors.Annotatef(err, "scatter index(%s) error", name))
return
}
}
writeData(w, "success!")
}
func (h tableHandler) handleStopScatterTableRequest(schema infoschema.InfoSchema, tbl table.Table, w http.ResponseWriter, req *http.Request) {
// for record
tableName := tbl.Meta().Name.String()
err := h.deleteScatterSchedule(tableName)
if err != nil {
writeError(w, errors.Annotate(err, "stop scatter record error"))
return
}
// for indices
for _, index := range tbl.Indices() {
indexName := index.Meta().Name.String()
name := tableName + "-" + indexName
err := h.deleteScatterSchedule(name)
if err != nil {
writeError(w, errors.Annotatef(err, "delete scatter index(%s) error", name))
return
}
}
writeData(w, "success!")
}
func (h tableHandler) handleRegionRequest(schema infoschema.InfoSchema, tbl table.Table, w http.ResponseWriter, req *http.Request) {
tableID := tbl.Meta().ID
// for record
startKey, endKey := tablecodec.GetTableHandleKeyRange(tableID)
recordRegionIDs, err := h.regionCache.ListRegionIDsInKeyRange(tikv.NewBackoffer(context.Background(), 500), startKey, endKey)
if err != nil {
writeError(w, err)
return
}
recordRegions, err := h.getRegionsMeta(recordRegionIDs)
if err != nil {
writeError(w, err)
return
}
// for indices
indices := make([]IndexRegions, len(tbl.Indices()))
for i, index := range tbl.Indices() {
indexID := index.Meta().ID
indices[i].Name = index.Meta().Name.String()
indices[i].ID = indexID
startKey, endKey := tablecodec.GetTableIndexKeyRange(tableID, indexID)
rIDs, err := h.regionCache.ListRegionIDsInKeyRange(tikv.NewBackoffer(context.Background(), 500), startKey, endKey)
if err != nil {
writeError(w, err)
return
}
indices[i].Regions, err = h.getRegionsMeta(rIDs)
if err != nil {
writeError(w, err)
return
}
}
tableRegions := &TableRegions{
TableName: tbl.Meta().Name.O,
TableID: tableID,
Indices: indices,
RecordRegions: recordRegions,
}
writeData(w, tableRegions)
}
// pdRegionStats is the json response from PD.
type pdRegionStats struct {
Count int `json:"count"`
EmptyCount int `json:"empty_count"`
StorageSize int64 `json:"storage_size"`
StoreLeaderCount map[uint64]int `json:"store_leader_count"`
StorePeerCount map[uint64]int `json:"store_peer_count"`
StoreLeaderSize map[uint64]int64 `json:"store_leader_size"`
StorePeerSize map[uint64]int64 `json:"store_peer_size"`
}
func (h tableHandler) handleDiskUsageRequest(schema infoschema.InfoSchema, tbl table.Table, w http.ResponseWriter, req *http.Request) {
tableID := tbl.Meta().ID
pdAddrs, err := h.getPDAddr()
if err != nil {
writeError(w, err)
return
}
// Include table and index data, because their range located in tableID_i tableID_r
startKey := tablecodec.EncodeTablePrefix(tableID)
endKey := tablecodec.EncodeTablePrefix(tableID + 1)
startKey = codec.EncodeBytes([]byte{}, startKey)
endKey = codec.EncodeBytes([]byte{}, endKey)
statURL := fmt.Sprintf("http://%s/pd/api/v1/stats/region?start_key=%s&end_key=%s",
pdAddrs[0],
url.QueryEscape(string(startKey)),
url.QueryEscape(string(endKey)))
resp, err := http.Get(statURL)
if err != nil {
writeError(w, err)
return
}
defer func() {
if err := resp.Body.Close(); err != nil {
log.Error(err)
}
}()
var stats pdRegionStats
dec := json.NewDecoder(resp.Body)
if err := dec.Decode(&stats); err != nil {
writeError(w, err)
return
}
writeData(w, stats.StorageSize)
}
// ServeHTTP handles request of get region by ID.
func (h 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 := h.regionCache.ListRegionIDsInKeyRange(tikv.NewBackoffer(context.Background(), 500), startKey, endKey)
if err != nil {
writeError(w, err)
return
}
recordRegions, err := h.getRegionsMeta(recordRegionIDs)
if err != nil {
writeError(w, err)
return
}
writeData(w, recordRegions)
return
}
regionIDInt, err := strconv.ParseInt(params[pRegionID], 0, 64)
if err != nil {
writeError(w, err)
return
}
regionID := uint64(regionIDInt)
// locate region
region, err := h.regionCache.LocateRegionByID(tikv.NewBackoffer(context.Background(), 500), regionID)
if err != nil {
writeError(w, err)
return
}
frameRange, err := NewRegionFrameRange(region)
if err != nil {
writeError(w, err)
return
}
// create RegionDetail from RegionFrameRange
regionDetail := &RegionDetail{
RegionID: regionID,
StartKey: region.StartKey,
EndKey: region.EndKey,
}
schema, err := h.schema()
if err != nil {
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 _, tableVal := range db.Tables {
regionDetail.addTableInRange(db.Name.String(), tableVal, frameRange)
}
}
writeData(w, regionDetail)
}
// NewFrameItemFromRegionKey creates a FrameItem with region's startKey or endKey,
// returns err when key is illegal.
func NewFrameItemFromRegionKey(key []byte) (frame *FrameItem, err error) {
frame = &FrameItem{}
frame.TableID, frame.IndexID, frame.IsRecord, err = tablecodec.DecodeKeyHead(key)
if err == nil {
if frame.IsRecord {
_, frame.RecordID, err = tablecodec.DecodeRecordKey(key)
} else {
_, _, frame.IndexValues, err = tablecodec.DecodeIndexKey(key)
}
log.Warnf("decode region key %q fail: %v", key, err)
// Ignore decode errors.
err = nil
return
}
if bytes.HasPrefix(key, tablecodec.TablePrefix()) {
// If SplitTable is enabled, the key may be `t{id}`.
if len(key) == tablecodec.TableSplitKeyLen {
frame.TableID = tablecodec.DecodeTableID(key)
return frame, nil
}
return nil, errors.Trace(err)
}
// 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