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168 lines
4.8 KiB
168 lines
4.8 KiB
// Copyright 2019 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 infoschema
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import (
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"bytes"
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"fmt"
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"sort"
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"strconv"
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"strings"
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"github.com/pingcap/errors"
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"github.com/pingcap/parser/model"
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"github.com/pingcap/parser/mysql"
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"github.com/pingcap/tidb/meta/autoid"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/table"
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"github.com/pingcap/tidb/util"
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"github.com/pingcap/tidb/util/set"
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)
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const (
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promQLQuantileKey = "$QUANTILE"
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promQLLabelConditionKey = "$LABEL_CONDITIONS"
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promQRangeDurationKey = "$RANGE_DURATION"
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)
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func init() {
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// Initialize the metric schema database and register the driver to `drivers`.
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dbID := autoid.MetricSchemaDBID
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tableID := dbID + 1
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metricTables := make([]*model.TableInfo, 0, len(MetricTableMap))
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for name, def := range MetricTableMap {
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cols := def.genColumnInfos()
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tableInfo := buildTableMeta(name, cols)
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tableInfo.ID = tableID
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tableInfo.Comment = def.Comment
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tableID++
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metricTables = append(metricTables, tableInfo)
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}
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dbInfo := &model.DBInfo{
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ID: dbID,
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Name: model.NewCIStr(util.MetricSchemaName.O),
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Charset: mysql.DefaultCharset,
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Collate: mysql.DefaultCollationName,
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Tables: metricTables,
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}
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RegisterVirtualTable(dbInfo, tableFromMeta)
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}
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// MetricTableDef is the metric table define.
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type MetricTableDef struct {
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PromQL string
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Labels []string
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Quantile float64
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Comment string
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}
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// IsMetricTable uses to checks whether the table is a metric table.
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func IsMetricTable(lowerTableName string) bool {
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_, ok := MetricTableMap[lowerTableName]
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return ok
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}
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// GetMetricTableDef gets the metric table define.
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func GetMetricTableDef(lowerTableName string) (*MetricTableDef, error) {
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def, ok := MetricTableMap[lowerTableName]
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if !ok {
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return nil, errors.Errorf("can not find metric table: %v", lowerTableName)
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}
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return &def, nil
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}
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func (def *MetricTableDef) genColumnInfos() []columnInfo {
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cols := []columnInfo{
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{name: "time", tp: mysql.TypeDatetime, size: 19, deflt: "CURRENT_TIMESTAMP"},
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}
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for _, label := range def.Labels {
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cols = append(cols, columnInfo{name: label, tp: mysql.TypeVarchar, size: 512})
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}
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if def.Quantile > 0 {
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defaultValue := strconv.FormatFloat(def.Quantile, 'f', -1, 64)
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cols = append(cols, columnInfo{name: "quantile", tp: mysql.TypeDouble, size: 22, deflt: defaultValue})
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}
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cols = append(cols, columnInfo{name: "value", tp: mysql.TypeDouble, size: 22})
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return cols
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}
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// GenPromQL generates the promQL.
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func (def *MetricTableDef) GenPromQL(sctx sessionctx.Context, labels map[string]set.StringSet, quantile float64) string {
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promQL := def.PromQL
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if strings.Contains(promQL, promQLQuantileKey) {
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promQL = strings.Replace(promQL, promQLQuantileKey, strconv.FormatFloat(quantile, 'f', -1, 64), -1)
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}
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if strings.Contains(promQL, promQLLabelConditionKey) {
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promQL = strings.Replace(promQL, promQLLabelConditionKey, def.genLabelCondition(labels), -1)
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}
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if strings.Contains(promQL, promQRangeDurationKey) {
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promQL = strings.Replace(promQL, promQRangeDurationKey, strconv.FormatInt(sctx.GetSessionVars().MetricSchemaRangeDuration, 10)+"s", -1)
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}
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return promQL
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}
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func (def *MetricTableDef) genLabelCondition(labels map[string]set.StringSet) string {
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var buf bytes.Buffer
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index := 0
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for _, label := range def.Labels {
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values := labels[label]
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if len(values) == 0 {
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continue
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}
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if index > 0 {
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buf.WriteByte(',')
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}
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switch len(values) {
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case 1:
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buf.WriteString(fmt.Sprintf("%s=\"%s\"", label, GenLabelConditionValues(values)))
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default:
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buf.WriteString(fmt.Sprintf("%s=~\"%s\"", label, GenLabelConditionValues(values)))
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}
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index++
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}
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return buf.String()
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}
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// GenLabelConditionValues generates the label condition values.
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func GenLabelConditionValues(values set.StringSet) string {
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vs := make([]string, 0, len(values))
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for k := range values {
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vs = append(vs, k)
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}
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sort.Strings(vs)
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return strings.Join(vs, "|")
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}
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// metricSchemaTable stands for the fake table all its data is in the memory.
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type metricSchemaTable struct {
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infoschemaTable
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}
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func tableFromMeta(alloc autoid.Allocators, meta *model.TableInfo) (table.Table, 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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t := &metricSchemaTable{
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infoschemaTable: infoschemaTable{
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meta: meta,
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cols: columns,
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tp: table.VirtualTable,
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},
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}
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return t, nil
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}
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