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metrics.go
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metrics.go
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package metrics
import (
"context"
"net"
"net/http"
"strings"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"go.opencensus.io/zpages"
errors "github.com/insolar/assured-ledger/ledger-core/vanilla/throw"
"github.com/insolar/assured-ledger/ledger-core/configuration"
"github.com/insolar/assured-ledger/ledger-core/instrumentation/inslogger"
"github.com/insolar/assured-ledger/ledger-core/instrumentation/insmetrics"
"github.com/insolar/assured-ledger/ledger-core/instrumentation/pprof"
"github.com/insolar/assured-ledger/ledger-core/log"
)
const insolarNamespace = "insolar"
// Metrics is a component which serve metrics data to Prometheus.
type Metrics struct {
config configuration.Metrics
registry *prometheus.Registry
nodeRole string
handler http.Handler
server *http.Server
listener net.Listener
}
// NewMetrics creates new Metrics instance.
func NewMetrics(
cfg configuration.Metrics,
registry *prometheus.Registry,
nodeRole string,
) *Metrics {
m := &Metrics{
config: cfg,
registry: registry,
nodeRole: nodeRole,
}
return m
}
// Init inits metrics instance. Creates and registers all handlers.
func (m *Metrics) Init(ctx context.Context) error {
mux := http.NewServeMux()
errLogger := &errorLogger{inslogger.FromContext(ctx)}
promHandler := promhttp.HandlerFor(m.registry, promhttp.HandlerOpts{ErrorLog: errLogger})
mux.Handle("/metrics", promHandler)
mux.Handle("/_status", newProcStatus())
mux.Handle("/debug/loglevel", inslogger.NewLoglevelChangeHandler())
pprof.Handle(mux)
if m.config.ZpagesEnabled {
// https://opencensus.io/zpages/
zpages.Handle(mux, "/debug")
}
_, err := insmetrics.RegisterPrometheus(
m.config.Namespace,
m.registry,
m.config.ReportingPeriod,
errLogger,
m.nodeRole,
)
if err != nil {
errLogger.Error(err.Error())
return err
}
m.handler = mux
return nil
}
// Handler returns http handler, created on initialization stage.
func (m *Metrics) Handler() http.Handler {
return m.handler
}
// ErrBind special case for Start method.
// We can use it for easier check in metrics creation code.
var ErrBind = errors.New("Failed to bind")
// Start is implementation of insolar.Component interface.
func (m *Metrics) Start(ctx context.Context) error {
inslog := inslogger.FromContext(ctx)
m.server = &http.Server{
Addr: m.config.ListenAddress,
Handler: m.handler,
}
listener, err := net.Listen("tcp", m.server.Addr)
if err != nil {
if opErr, ok := err.(*net.OpError); ok {
if opErr.Op == "listen" && IsAddrInUse(opErr) {
return errors.Wrapf(ErrBind, "addr=%v", m.server.Addr)
}
}
return errors.W(err, "Failed to listen at address")
}
m.listener = listener
inslog.Info("Started metrics server: ", m.listener.Addr().String())
go func() {
inslog.Debug("Metrics server starting on ", m.server.Addr)
if err := m.server.Serve(listener); err != http.ErrServerClosed {
inslog.Error("Failed to start metrics server ", err)
}
}()
return nil
}
// Stop is implementation of insolar.Component interface.
func (m *Metrics) Stop(ctx context.Context) error {
if m.server == nil {
return nil
}
const timeOut = 3
inslogger.FromContext(ctx).Info("Shutting down metrics server")
ctxWithTimeout, cancel := context.WithTimeout(ctx, time.Duration(timeOut)*time.Second)
defer cancel()
err := m.server.Shutdown(ctxWithTimeout)
return errors.W(err, "Can't gracefully stop metrics server")
}
// errorLogger wrapper for error logs.
type errorLogger struct {
log.Logger
}
// Println is wrapper method for Error method.
func (e *errorLogger) Println(v ...interface{}) {
e.Error(v)
}
// IsAddrInUse checks error text for well known phrase.
func IsAddrInUse(err error) bool {
return strings.Contains(err.Error(), "address already in use")
}