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prometheus.go
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prometheus.go
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package main
import (
"fmt"
"net/http"
"time"
"github.com/alitto/pond"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
func main() {
// Create a worker pool
pool := pond.New(10, 100)
// Register pool metrics collectors
// Worker pool metrics
prometheus.MustRegister(prometheus.NewGaugeFunc(
prometheus.GaugeOpts{
Name: "pool_workers_running",
Help: "Number of running worker goroutines",
},
func() float64 {
return float64(pool.RunningWorkers())
}))
prometheus.MustRegister(prometheus.NewGaugeFunc(
prometheus.GaugeOpts{
Name: "pool_workers_idle",
Help: "Number of idle worker goroutines",
},
func() float64 {
return float64(pool.IdleWorkers())
}))
// Task metrics
prometheus.MustRegister(prometheus.NewCounterFunc(
prometheus.CounterOpts{
Name: "pool_tasks_submitted_total",
Help: "Number of tasks submitted",
},
func() float64 {
return float64(pool.SubmittedTasks())
}))
prometheus.MustRegister(prometheus.NewGaugeFunc(
prometheus.GaugeOpts{
Name: "pool_tasks_waiting_total",
Help: "Number of tasks waiting in the queue",
},
func() float64 {
return float64(pool.WaitingTasks())
}))
prometheus.MustRegister(prometheus.NewCounterFunc(
prometheus.CounterOpts{
Name: "pool_tasks_successful_total",
Help: "Number of tasks that completed successfully",
},
func() float64 {
return float64(pool.SuccessfulTasks())
}))
prometheus.MustRegister(prometheus.NewCounterFunc(
prometheus.CounterOpts{
Name: "pool_tasks_failed_total",
Help: "Number of tasks that completed with panic",
},
func() float64 {
return float64(pool.FailedTasks())
}))
prometheus.MustRegister(prometheus.NewCounterFunc(
prometheus.CounterOpts{
Name: "pool_tasks_completed_total",
Help: "Number of tasks that completed either successfully or with panic",
},
func() float64 {
return float64(pool.CompletedTasks())
}))
// Expose the registered metrics via HTTP
http.Handle("/metrics", promhttp.Handler())
go submitTasks(pool)
// Start the server
http.ListenAndServe(":8080", nil)
}
func submitTasks(pool *pond.WorkerPool) {
// Submit 1000 tasks
for i := 0; i < 1000; i++ {
n := i
pool.Submit(func() {
fmt.Printf("Running task #%d\n", n)
time.Sleep(500 * time.Millisecond)
})
}
}