70 lines
2.4 KiB
Go
70 lines
2.4 KiB
Go
// Copyright 2021 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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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 metrics
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import (
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"github.com/prometheus/client_golang/prometheus"
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dto "github.com/prometheus/client_model/go"
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)
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// Metrics
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var (
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TelemetrySQLCTECnt = prometheus.NewCounterVec(
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prometheus.CounterOpts{
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Namespace: "tidb",
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Subsystem: "telemetry",
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Name: "non_recursive_cte_usage",
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Help: "Counter of usage of CTE",
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}, []string{LblCTEType})
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)
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// readCounter reads the value of a prometheus.Counter.
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// Returns -1 when failing to read the value.
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func readCounter(m prometheus.Counter) int64 {
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// Actually, it's not recommended to read the value of prometheus metric types directly:
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// https://github.com/prometheus/client_golang/issues/486#issuecomment-433345239
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pb := &dto.Metric{}
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// It's impossible to return an error though.
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if err := m.Write(pb); err != nil {
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return -1
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}
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return int64(pb.GetCounter().GetValue())
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}
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// CTEUsageCounter records the usages of CTE.
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type CTEUsageCounter struct {
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NonRecursiveCTEUsed int64 `json:"nonRecursiveCTEUsed"`
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RecursiveUsed int64 `json:"recursiveUsed"`
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NonCTEUsed int64 `json:"nonCTEUsed"`
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}
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// Sub returns the difference of two counters.
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func (c CTEUsageCounter) Sub(rhs CTEUsageCounter) CTEUsageCounter {
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return CTEUsageCounter{
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NonRecursiveCTEUsed: c.NonRecursiveCTEUsed - rhs.NonRecursiveCTEUsed,
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RecursiveUsed: c.RecursiveUsed - rhs.RecursiveUsed,
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NonCTEUsed: c.NonCTEUsed - rhs.NonCTEUsed,
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}
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}
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// GetCTECounter gets the TxnCommitCounter.
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func GetCTECounter() CTEUsageCounter {
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return CTEUsageCounter{
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NonRecursiveCTEUsed: readCounter(TelemetrySQLCTECnt.With(prometheus.Labels{LblCTEType: "nonRecurCTE"})),
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RecursiveUsed: readCounter(TelemetrySQLCTECnt.With(prometheus.Labels{LblCTEType: "recurCTE"})),
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NonCTEUsed: readCounter(TelemetrySQLCTECnt.With(prometheus.Labels{LblCTEType: "notCTE"})),
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}
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}
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