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metrics.go
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metrics.go
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package metrics
import (
"context"
"fmt"
"log/slog"
"net/http"
"strconv"
"sync"
"time"
"github.com/anycable/anycable-go/server"
)
const DefaultRotateInterval = 15
// IntervalHandler describe a periodical metrics writer interface
type IntervalWriter interface {
Run(interval int) error
Stop()
Write(m *Metrics) error
}
//go:generate mockery --name Instrumenter --output "../mocks" --outpkg mocks
type Instrumenter interface {
CounterIncrement(name string)
CounterAdd(name string, val uint64)
GaugeIncrement(name string)
GaugeDecrement(name string)
GaugeSet(name string, val uint64)
RegisterCounter(name string, desc string)
RegisterGauge(name string, desc string)
}
// Metrics stores some useful stats about node
type Metrics struct {
mu sync.RWMutex
writers []IntervalWriter
server *server.HTTPServer
httpPath string
rotateInterval time.Duration
tags map[string]string
counters map[string]*Counter
gauges map[string]*Gauge
shutdownCh chan struct{}
closed bool
log *slog.Logger
}
var _ Instrumenter = (*Metrics)(nil)
// NewFromConfig creates a new metrics instance from the prodived configuration
func NewFromConfig(config *Config, l *slog.Logger) (*Metrics, error) {
var metricsPrinter IntervalWriter
writers := []IntervalWriter{}
if config.LogEnabled() {
if config.LogFormatterEnabled() {
customPrinter, err := NewCustomPrinter(config.LogFormatter, l)
if err == nil {
metricsPrinter = customPrinter
} else {
return nil, err
}
} else {
metricsPrinter = NewBasePrinter(config.LogFilter, l)
}
writers = append(writers, metricsPrinter)
}
instance := NewMetrics(writers, config.RotateInterval, l)
if config.Tags != nil {
instance.tags = config.Tags
}
if config.HTTPEnabled() {
if config.Host != "" && config.Host != server.Host {
srv, err := server.NewServer(config.Host, strconv.Itoa(config.Port), server.SSL, 0)
if err != nil {
return nil, err
}
instance.server = srv
} else {
srv, err := server.ForPort(strconv.Itoa(config.Port))
if err != nil {
return nil, err
}
instance.server = srv
}
instance.httpPath = config.HTTP
instance.server.SetupHandler(instance.httpPath, http.HandlerFunc(instance.PrometheusHandler))
}
return instance, nil
}
// NewMetrics build new metrics struct
func NewMetrics(writers []IntervalWriter, rotateIntervalSeconds int, l *slog.Logger) *Metrics {
rotateInterval := time.Duration(rotateIntervalSeconds) * time.Second
return &Metrics{
writers: writers,
rotateInterval: rotateInterval,
counters: make(map[string]*Counter),
gauges: make(map[string]*Gauge),
shutdownCh: make(chan struct{}),
log: l.With("context", "metrics"),
}
}
func (m *Metrics) DefaultTags(tags map[string]string) {
m.tags = tags
}
func (m *Metrics) RegisterWriter(w IntervalWriter) {
m.writers = append(m.writers, w)
}
// Run periodically updates counters delta (and logs metrics if necessary)
func (m *Metrics) Run() error {
if m.server != nil {
m.log.Info(fmt.Sprintf("Serve metrics at %s%s", m.server.Address(), m.httpPath))
if err := m.server.StartAndAnnounce("Metrics server"); err != nil {
if !m.server.Stopped() {
return fmt.Errorf("metrics HTTP server at %s stopped: %v", m.server.Address(), err)
}
}
}
if len(m.writers) == 0 {
m.log.Debug("no metrics writers, disabling metrics rotation")
return nil
}
if m.rotateInterval == 0 {
m.rotateInterval = DefaultRotateInterval * time.Second
}
for _, writer := range m.writers {
if err := writer.Run(int(m.rotateInterval.Seconds())); err != nil {
return err
}
}
for {
select {
case <-m.shutdownCh:
return nil
case <-time.After(m.rotateInterval):
m.log.Debug("rotate metrics", "interval", m.rotateInterval)
m.rotate()
for _, writer := range m.writers {
if err := writer.Write(m); err != nil {
m.log.Error("metrics writer failed to write", "error", err)
}
}
}
}
}
// Shutdown stops metrics updates
func (m *Metrics) Shutdown(ctx context.Context) (err error) {
m.mu.Lock()
defer m.mu.Unlock()
if m.closed {
return
}
m.closed = true
close(m.shutdownCh)
if m.server != nil {
m.server.Shutdown(ctx) //nolint:errcheck
}
for _, writer := range m.writers {
writer.Stop()
}
return
}
// RegisterCounter adds new counter to the registry
func (m *Metrics) RegisterCounter(name string, desc string) {
m.mu.Lock()
defer m.mu.Unlock()
m.counters[name] = NewCounter(name, desc)
}
// RegisterGauge adds new gauge to the registry
func (m *Metrics) RegisterGauge(name string, desc string) {
m.mu.Lock()
defer m.mu.Unlock()
m.gauges[name] = NewGauge(name, desc)
}
// GaugeIncrement increments the given gauge
func (m *Metrics) GaugeIncrement(name string) {
m.gauges[name].Inc()
}
// GaugeDecrement increments the given gauge
func (m *Metrics) GaugeDecrement(name string) {
m.gauges[name].Dec()
}
// GaugeSet sets the given gauge
func (m *Metrics) GaugeSet(name string, val uint64) {
m.gauges[name].Set64(val)
}
// Counter returns counter by name
func (m *Metrics) Counter(name string) *Counter {
return m.counters[name]
}
// CounterIncrement increments the given counter
func (m *Metrics) CounterIncrement(name string) {
m.counters[name].Inc()
}
// CounterAdd adds a value to the given counter
func (m *Metrics) CounterAdd(name string, val uint64) {
m.counters[name].Add(val)
}
// EachCounter applies function f(*Gauge) to each gauge in a set
func (m *Metrics) EachCounter(f func(c *Counter)) {
m.mu.RLock()
defer m.mu.RUnlock()
for _, counter := range m.counters {
f(counter)
}
}
// Gauge returns gauge by name
func (m *Metrics) Gauge(name string) *Gauge {
return m.gauges[name]
}
// EachGauge applies function f(*Gauge) to each gauge in a set
func (m *Metrics) EachGauge(f func(g *Gauge)) {
m.mu.RLock()
defer m.mu.RUnlock()
for _, gauge := range m.gauges {
f(gauge)
}
}
// IntervalSnapshot returns recorded interval metrics snapshot
func (m *Metrics) IntervalSnapshot() map[string]uint64 {
m.mu.RLock()
defer m.mu.RUnlock()
snapshot := make(map[string]uint64)
for name, c := range m.counters {
snapshot[name] = c.IntervalValue()
}
for name, g := range m.gauges {
snapshot[name] = g.Value()
}
return snapshot
}
func (m *Metrics) rotate() {
m.mu.Lock()
defer m.mu.Unlock()
for _, c := range m.counters {
c.UpdateDelta()
}
}