walterlife commented on code in PR #2303: URL: https://github.com/apache/incubator-eventmesh/pull/2303#discussion_r1038671401
########## eventmesh-workflow-go/internal/metrics/metrics.go: ########## @@ -0,0 +1,177 @@ +// Licensed to the Apache Software Foundation (ASF) under one or more +// contributor license agreements. See the NOTICE file distributed with +// this work for additional information regarding copyright ownership. +// The ASF licenses this file to You 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, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package metrics + +import ( + "fmt" + "github.com/apache/incubator-eventmesh/eventmesh-server-go/log" + conf "github.com/apache/incubator-eventmesh/eventmesh-workflow-go/config" + "github.com/prometheus/client_golang/prometheus" + "github.com/prometheus/client_golang/prometheus/promhttp" + "net/http" + "sync" +) + +func init() { + prometheusMetrics = getPrometheusMetricsByConfig() +} + +var prometheusMetrics *Metrics + +func Inc(name string, label string) { + collector := prometheusMetrics.loadCollector(name, gauge).(*prometheus.GaugeVec) + collector.With(prometheus.Labels{"label": label}).Inc() +} + +func Add(name string, label string, val float64) { + collector := prometheusMetrics.loadCollector(name, gauge).(*prometheus.GaugeVec) + collector.With(prometheus.Labels{"label": label}).Add(val) +} + +func Sub(name string, label string, val float64) { + collector := prometheusMetrics.loadCollector(name, gauge).(*prometheus.GaugeVec) + collector.With(prometheus.Labels{"label": label}).Sub(val) +} + +func Dec(name string, label string) { + collector := prometheusMetrics.loadCollector(name, gauge).(*prometheus.GaugeVec) + collector.With(prometheus.Labels{"label": label}).Dec() +} + +func RecordLatency(name string, label string, latency float64) { + collector := prometheusMetrics.loadCollector(name, histogram).(*prometheus.HistogramVec) + collector.With(prometheus.Labels{"label": label}).Observe(latency) +} + +func getPrometheusMetricsByConfig() *Metrics { + config := conf.Get() + + port := "" + if !checkMetricsConfig(config) { + port = defaultEndPoint + } else { + port = config.Metrics.EndpointPort + } + + m := &Metrics{ + counters: make(map[string]prometheus.Collector), + histograms: make(map[string]prometheus.Collector), + port: port, + } + m.Init() + return m +} + +func checkMetricsConfig(config *conf.Config) bool { + if config == nil || len(config.Metrics.EndpointPort) == 0 { + return false + } + return true +} + +type Metrics struct { + counters map[string]prometheus.Collector + histograms map[string]prometheus.Collector + gauges map[string]prometheus.Collector + lock sync.Mutex + once sync.Once + port string +} + +const ( + nameSpace = "eventmesh" + subSystem = "workflow" + defaultEndPoint = "19090" +) + +const ( + histogram = iota + gauge +) + +// Init try to init metrics, include exposing http endpoint +func (p *Metrics) Init() { + p.once.Do(func() { + p.exposeEndpoint() + }) +} + +// exposeEndpoint expose http endpoint +func (p *Metrics) exposeEndpoint() { + go func() { + http.Handle("/metrics", promhttp.Handler()) + err := http.ListenAndServe(fmt.Sprintf(":%s", p.port), nil) + if err != nil { + log.Errorf("fail to listen prometheus endpoint port %s, err=%v", p.port, err) + } + }() +} + +// loadCollector load collector by name and collectorType +func (p *Metrics) loadCollector(name string, collectorType int) prometheus.Collector { + if collector := p.getCollectorByNameAndType(name, collectorType); collector != nil { + return collector + } + return p.registerNewCollector(name, collectorType) +} + +func (p *Metrics) getCollectorByNameAndType(name string, collectorType int) prometheus.Collector { + switch collectorType { + case histogram: + return p.histograms[name] + case gauge: + return p.histograms[name] + default: + panic("prometheus metrics get collector error, illegal collector type") Review Comment: try to use error return instead of panic @horoc ########## eventmesh-workflow-go/internal/constants/constants.go: ########## @@ -68,3 +68,23 @@ const ( EventPropsWorkflowInstanceID = "workflowinstanceid" EventPropsWorkflowTaskInstanceID = "workflowtaskinstanceid" ) + +// Metrics Related constants +const ( + MetricsEventTask = "event_task" + MetricsOperationTask = "operation_task" + MetricsSwitchTask = "switch_task" + MetricsScheduler = "scheduler" + MetricsEngine = "engine" + MetricsTaskQueue = "task_queue" + + MetricsTotal = "total" + MetricsSwitchReject = "reject" + MetricsSwitchPass = "pass" + + MetricsStartRequest = "start_request" Review Comment: Is it possible to initialize the metric collector first? @horoc -- This is an automated message from the Apache Git Service. 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