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|
package metrics
// todo: declare metric at runtime
import (
"context"
"crypto/tls"
"fmt"
"net/http"
"sync"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/sirupsen/logrus"
"github.com/spiral/roadrunner/service/rpc"
"golang.org/x/sys/cpu"
)
const (
// ID declares public service name.
ID = "metrics"
// maxHeaderSize declares max header size for prometheus server
maxHeaderSize = 1024 * 1024 * 100 // 104MB
)
// Service to manage application metrics using Prometheus.
type Service struct {
cfg *Config
log *logrus.Logger
mu sync.Mutex
http *http.Server
collectors sync.Map
registry *prometheus.Registry
}
// Init service.
func (s *Service) Init(cfg *Config, r *rpc.Service, log *logrus.Logger) (bool, error) {
s.cfg = cfg
s.log = log
s.registry = prometheus.NewRegistry()
s.registry.MustRegister(prometheus.NewProcessCollector(prometheus.ProcessCollectorOpts{}))
s.registry.MustRegister(prometheus.NewGoCollector())
if r != nil {
if err := r.Register(ID, &rpcServer{s}); err != nil {
return false, err
}
}
return true, nil
}
// Enabled indicates that server is able to collect metrics.
func (s *Service) Enabled() bool {
return s.cfg != nil
}
// Register new prometheus collector.
func (s *Service) Register(c prometheus.Collector) error {
return s.registry.Register(c)
}
// MustRegister registers new collector or fails with panic.
func (s *Service) MustRegister(c prometheus.Collector) {
s.registry.MustRegister(c)
}
// Serve prometheus metrics service.
func (s *Service) Serve() error {
// register application specific metrics
collectors, err := s.cfg.getCollectors()
if err != nil {
return err
}
for name, collector := range collectors {
if err := s.registry.Register(collector); err != nil {
return err
}
s.collectors.Store(name, collector)
}
s.mu.Lock()
var topCipherSuites []uint16
var defaultCipherSuitesTLS13 []uint16
hasGCMAsmAMD64 := cpu.X86.HasAES && cpu.X86.HasPCLMULQDQ
hasGCMAsmARM64 := cpu.ARM64.HasAES && cpu.ARM64.HasPMULL
// Keep in sync with crypto/aes/cipher_s390x.go.
hasGCMAsmS390X := cpu.S390X.HasAES && cpu.S390X.HasAESCBC && cpu.S390X.HasAESCTR && (cpu.S390X.HasGHASH || cpu.S390X.HasAESGCM)
hasGCMAsm := hasGCMAsmAMD64 || hasGCMAsmARM64 || hasGCMAsmS390X
if hasGCMAsm {
// If AES-GCM hardware is provided then prioritise AES-GCM
// cipher suites.
topCipherSuites = []uint16{
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
}
defaultCipherSuitesTLS13 = []uint16{
tls.TLS_AES_128_GCM_SHA256,
tls.TLS_CHACHA20_POLY1305_SHA256,
tls.TLS_AES_256_GCM_SHA384,
}
} else {
// Without AES-GCM hardware, we put the ChaCha20-Poly1305
// cipher suites first.
topCipherSuites = []uint16{
tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
}
defaultCipherSuitesTLS13 = []uint16{
tls.TLS_CHACHA20_POLY1305_SHA256,
tls.TLS_AES_128_GCM_SHA256,
tls.TLS_AES_256_GCM_SHA384,
}
}
DefaultCipherSuites := make([]uint16, 0, 22)
DefaultCipherSuites = append(DefaultCipherSuites, topCipherSuites...)
DefaultCipherSuites = append(DefaultCipherSuites, defaultCipherSuitesTLS13...)
s.http = &http.Server{
Addr: s.cfg.Address,
Handler: promhttp.HandlerFor(s.registry, promhttp.HandlerOpts{}),
IdleTimeout: time.Hour * 24,
ReadTimeout: time.Minute * 60,
MaxHeaderBytes: maxHeaderSize,
ReadHeaderTimeout: time.Minute * 60,
WriteTimeout: time.Minute * 60,
TLSConfig: &tls.Config{
CurvePreferences: []tls.CurveID{
tls.CurveP256,
tls.CurveP384,
tls.CurveP521,
tls.X25519,
},
CipherSuites: DefaultCipherSuites,
MinVersion: tls.VersionTLS12,
PreferServerCipherSuites: true,
},
}
s.mu.Unlock()
err = s.http.ListenAndServe()
if err != nil && err != http.ErrServerClosed {
return err
}
return nil
}
// Stop prometheus metrics service.
func (s *Service) Stop() {
s.mu.Lock()
defer s.mu.Unlock()
if s.http != nil {
// gracefully stop server
go func() {
err := s.http.Shutdown(context.Background())
if err != nil {
// Function should be Stop() error
s.log.Error(fmt.Errorf("error shutting down the metrics server: error %v", err))
}
}()
}
}
// Collector returns application specific collector by name or nil if collector not found.
func (s *Service) Collector(name string) prometheus.Collector {
collector, ok := s.collectors.Load(name)
if !ok {
return nil
}
return collector.(prometheus.Collector)
}
|
