/
metrics.go
176 lines (159 loc) · 3.37 KB
/
metrics.go
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package metrics
import (
"errors"
"sync"
"time"
"github.com/shirou/gopsutil/process"
)
type Metric struct {
Name string
Description string
Format string
Unit string
InitialValue interface{}
}
// Metrics struct
type Metrics struct {
sync.Map
collectInterval time.Duration
metrics []Metric
procPIDs []int32
procMetrics []Metric
}
// NewMetrics returns *Metrics
func NewMetrics(interval time.Duration) *Metrics {
m := &Metrics{
collectInterval: interval,
}
m.InitializeMetrics()
return m
}
func (m *Metrics) InitializeMetrics() {
m.metrics = AvailableMetrics()
for _, metric := range m.metrics {
m.Store(metric.Name, metric.InitialValue)
}
}
func (m *Metrics) InitializeProcMetrics() {
m.procMetrics = AvailableProcMetrics()
for _, metric := range m.procMetrics {
m.Store(metric.Name, metric.InitialValue)
}
}
func (m *Metrics) SetProcPIDs(pids []int32) error {
for _, pid := range pids {
if pid <= 0 {
return errors.New("PID should be >= 0")
}
m.procPIDs = append(m.procPIDs, pid)
}
return nil
}
func (m *Metrics) Format(key string) string {
for _, metric := range m.metrics {
if metric.Name == key {
return metric.Format
}
}
return "%v"
}
// Raw returns raw metrics map
func (m *Metrics) Raw() map[string]interface{} {
metrics := map[string]interface{}{}
// process metrics
for _, metric := range m.procMetrics {
if value, ok := m.Load(metric.Name); ok {
metrics[metric.Name] = value
} else {
metrics[metric.Name] = 0
}
}
// system metrics
for _, metric := range m.metrics {
if value, ok := m.Load(metric.Name); ok {
metrics[metric.Name] = value
} else {
metrics[metric.Name] = 0
}
}
return metrics
}
// Each returns ordered metrics
func (m *Metrics) Each(f func(metric Metric, value interface{})) {
// process metrics
for _, metric := range m.procMetrics {
if value, ok := m.Load(metric.Name); ok {
f(metric, value)
} else {
f(metric, 0)
}
}
// system metrics
for _, metric := range m.metrics {
if value, ok := m.Load(metric.Name); ok {
f(metric, value)
} else {
f(metric, 0)
}
}
}
// GetMetrics returns metrics
func GetMetrics(interval time.Duration, pids ...int32) (*Metrics, error) {
if len(pids) > 0 && !(len(pids) == 1 && pids[0] == 0) {
return GetMetricsByPIDs(interval, pids)
}
m := NewMetrics(interval)
err := m.Collect()
if err != nil {
return nil, err
}
return m, nil
}
// GetMetricsByPIDs returns metrics
func GetMetricsByPIDs(interval time.Duration, pids []int32) (*Metrics, error) {
if len(pids) == 0 {
return nil, errors.New("empty pids")
}
m := NewMetrics(interval)
m.InitializeProcMetrics()
err := m.SetProcPIDs(pids)
if err != nil {
return nil, err
}
err = m.Collect()
if err != nil {
return nil, err
}
return m, nil
}
// GetMetricsByName returns metrics
func GetMetricsByName(interval time.Duration, name string) (*Metrics, error) {
if name == "" {
return nil, errors.New("empty name")
}
m := NewMetrics(interval)
m.InitializeProcMetrics()
processes, err := process.Processes()
if err != nil {
return nil, err
}
pids := []int32{}
for _, p := range processes {
pname, err := p.Name()
if err != nil {
continue
}
if pname == name {
pids = append(pids, p.Pid)
}
}
err = m.SetProcPIDs(pids)
if err != nil {
return nil, err
}
err = m.Collect()
if err != nil {
return nil, err
}
return m, nil
}