101 lines
2.8 KiB
Go
101 lines
2.8 KiB
Go
// Copyright 2017 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 perfschema
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import (
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"fmt"
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log "github.com/Sirupsen/logrus"
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"github.com/juju/errors"
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"github.com/pingcap/tidb/context"
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"github.com/pingcap/tidb/model"
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"github.com/pingcap/tidb/sessionctx/variable"
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"github.com/pingcap/tidb/table"
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"github.com/pingcap/tidb/table/tables"
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"github.com/pingcap/tidb/types"
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)
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// session/global status decided by scope.
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type statusDataSource struct {
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meta *model.TableInfo
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cols []*table.Column
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globalScope bool
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}
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// GetRows implements the interface of VirtualDataSource.
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func (ds *statusDataSource) GetRows(ctx context.Context) (fullRows [][]types.Datum,
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err error) {
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sessionVars := ctx.GetSessionVars()
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statusVars, err := variable.GetStatusVars(sessionVars)
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if err != nil {
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return nil, errors.Trace(err)
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}
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rows := [][]types.Datum{}
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for status, v := range statusVars {
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if ds.globalScope && v.Scope == variable.ScopeSession {
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continue
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}
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switch v.Value.(type) {
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case []interface{}, nil:
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v.Value = fmt.Sprintf("%v", v.Value)
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}
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value, err := types.ToString(v.Value)
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if err != nil {
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return nil, errors.Trace(err)
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}
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row := types.MakeDatums(status, value)
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rows = append(rows, row)
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}
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return rows, nil
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}
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// Meta implements the interface of VirtualDataSource.
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func (ds *statusDataSource) Meta() *model.TableInfo {
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return ds.meta
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}
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// Cols implements the interface of VirtualDataSource.
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func (ds *statusDataSource) Cols() []*table.Column {
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return ds.cols
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}
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// CreateVirtualDataSource is only used for test.
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func CreateVirtualDataSource(tableName string, meta *model.TableInfo) (tables.VirtualDataSource, error) {
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columns := make([]*table.Column, 0, len(meta.Columns))
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for _, colInfo := range meta.Columns {
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col := table.ToColumn(colInfo)
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columns = append(columns, col)
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}
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switch tableName {
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case TableSessionStatus:
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return &statusDataSource{meta: meta, cols: columns, globalScope: false}, nil
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case TableGlobalStatus:
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return &statusDataSource{meta: meta, cols: columns, globalScope: true}, nil
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default:
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return nil, errors.New("can't find table named by " + tableName)
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}
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}
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func createVirtualTable(meta *model.TableInfo, tableName string) table.Table {
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dataSource, err := CreateVirtualDataSource(tableName, meta)
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if err != nil {
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log.Fatal(err.Error())
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}
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return tables.CreateVirtualTable(dataSource)
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}
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