func NewHandler(s api.FluxService, r *mux.Router, logger log.Logger, h metrics.Histogram) http.Handler {
for method, handlerFunc := range map[string]func(api.FluxService) http.Handler{
"ListServices": handleListServices,
"ListImages": handleListImages,
"PostRelease": handlePostRelease,
"GetRelease": handleGetRelease,
"Automate": handleAutomate,
"Deautomate": handleDeautomate,
"Lock": handleLock,
"Unlock": handleUnlock,
"History": handleHistory,
"GetConfig": handleGetConfig,
"SetConfig": handleSetConfig,
"RegisterDaemon": handleRegister,
"IsConnected": handleIsConnected,
} {
var handler http.Handler
handler = handlerFunc(s)
handler = logging(handler, log.NewContext(logger).With("method", method))
handler = observing(handler, h.With("method", method))
r.Get(method).Handler(handler)
}
return r
}
func observing(next http.Handler, h metrics.Histogram) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
begin := time.Now()
cw := &codeWriter{w, http.StatusOK}
next.ServeHTTP(cw, r)
h.With("status_code", strconv.Itoa(cw.code)).Observe(time.Since(begin).Seconds())
})
}
// EndpointInstrumentingMiddleware returns an endpoint middleware that records
// the duration of each invocation to the passed histogram. The middleware adds
// a single field: "success", which is "true" if no error is returned, and
// "false" otherwise.
func EndpointInstrumentingMiddleware(duration metrics.Histogram) endpoint.Middleware {
return func(next endpoint.Endpoint) endpoint.Endpoint {
return func(ctx context.Context, request interface{}) (response interface{}, err error) {
defer func(begin time.Time) {
duration.With("success", fmt.Sprint(err == nil)).Observe(time.Since(begin).Seconds())
}(time.Now())
return next(ctx, request)
}
}
}
func TestScaledHistogram(t *testing.T) {
var (
quantiles = []int{50, 90, 99}
scale = int64(10)
metricName = "test_scaled_histogram"
)
var h metrics.Histogram
h = expvar.NewHistogram(metricName, 0, 1000, 3, quantiles...)
h = metrics.NewScaledHistogram(h, scale)
h = h.With(metrics.Field{Key: "a", Value: "b"})
const seed, mean, stdev = 333, 500, 100 // input values
teststat.PopulateNormalHistogram(t, h, seed, mean, stdev) // will be scaled down
assertExpvarNormalHistogram(t, metricName, mean/scale, stdev/scale, quantiles)
}
func main() {
var (
debugAddr = flag.String("debug.addr", ":8080", "Debug and metrics listen address")
grpcAddr = flag.String("grpc.addr", ":8082", "gRPC (HTTP) listen address")
appdashAddr = flag.String("appdash.addr", "", "Enable Appdash tracing via an Appdash server host:port")
ircNick = flag.String("irc.nick", "gogrpctest", "IRC nickname")
ircSecret = flag.String("irc.secret", "", "IRC password")
ircHost = flag.String("irc.addr", "irc.freenode.net:6667", "IRC host system")
)
flag.Parse()
// Logging domain.
var logger log.Logger
{
logger = log.NewLogfmtLogger(os.Stdout)
logger = log.NewContext(logger).With("ts", log.DefaultTimestampUTC)
logger = log.NewContext(logger).With("caller", log.DefaultCaller)
}
logger.Log("msg", "hello")
defer logger.Log("msg", "goodbye")
// Metrics domain.
var cx, cxerr, joins metrics.Counter
{
// Business level metrics.
cx = prometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "relay",
Name: "connect_succeeded",
Help: "Total count of connects via the Connect method.",
}, []string{})
cxerr = prometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "relay",
Name: "connect_failed",
Help: "Total count of connect errors via the Connect method.",
}, []string{})
joins = prometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "relay",
Name: "channels_joined",
Help: "Total count of channels joined via the Join method.",
}, []string{})
}
var duration metrics.Histogram
{
// Transport level metrics.
duration = prometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
Namespace: "relay",
Name: "request_duration_ns",
Help: "Request duration in nanoseconds.",
}, []string{"method", "success"})
}
// Tracing domain.
var tracer stdopentracing.Tracer
{
if *appdashAddr != "" {
logger := log.NewContext(logger).With("tracer", "Appdash")
logger.Log("addr", *appdashAddr)
tracer = appdashot.NewTracer(appdash.NewRemoteCollector(*appdashAddr))
} else {
logger := log.NewContext(logger).With("tracer", "none")
logger.Log()
tracer = stdopentracing.GlobalTracer() // no-op
}
}
// Business domain.
var service relay.Service
{
service = relay.NewBasicService(*ircNick, *ircHost, *ircSecret)
service = relay.ServiceLoggingMiddleware(logger)(service)
service = relay.ServiceInstrumentingMiddleware(cx, cxerr, joins)(service)
}
// Endpoint domain.
var connectEndpoint endpoint.Endpoint
{
connectDuration := duration.With("method", "Connect")
connectLogger := log.NewContext(logger).With("method", "Connect")
connectEndpoint = relay.MakeConnectEndpoint(service)
connectEndpoint = opentracing.TraceServer(tracer, "Connect")(connectEndpoint)
connectEndpoint = relay.EndpointInstrumentingMiddleware(connectDuration)(connectEndpoint)
connectEndpoint = relay.EndpointLoggingMiddleware(connectLogger)(connectEndpoint)
}
var joinEndpoint endpoint.Endpoint
{
joinDuration := duration.With("method", "Join")
joinLogger := log.NewContext(logger).With("method", "Join")
joinEndpoint = relay.MakeJoinEndpoint(service)
joinEndpoint = opentracing.TraceServer(tracer, "Join")(joinEndpoint)
joinEndpoint = relay.EndpointInstrumentingMiddleware(joinDuration)(joinEndpoint)
joinEndpoint = relay.EndpointLoggingMiddleware(joinLogger)(joinEndpoint)
}
endpoints := relay.Endpoints{
ConnectEndpoint: connectEndpoint,
JoinEndpoint: joinEndpoint,
}
// Mechanical domain.
errc := make(chan error)
ctx := context.Background()
// Interrupt handler.
go func() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
errc <- fmt.Errorf("%s", <-c)
}()
// Debug listener.
go func() {
logger := log.NewContext(logger).With("transport", "debug")
m := http.NewServeMux()
m.Handle("/debug/pprof/", http.HandlerFunc(pprof.Index))
m.Handle("/debug/pprof/cmdline", http.HandlerFunc(pprof.Cmdline))
m.Handle("/debug/pprof/profile", http.HandlerFunc(pprof.Profile))
m.Handle("/debug/pprof/symbol", http.HandlerFunc(pprof.Symbol))
m.Handle("/debug/pprof/trace", http.HandlerFunc(pprof.Trace))
m.Handle("/metrics", stdprometheus.Handler())
logger.Log("addr", *debugAddr)
errc <- http.ListenAndServe(*debugAddr, m)
}()
// gRPC transport.
go func() {
logger := log.NewContext(logger).With("transport", "gRPC")
ln, err := net.Listen("tcp", *grpcAddr)
if err != nil {
errc <- err
return
}
srv := relay.MakeGRPCServer(ctx, endpoints, tracer, logger)
s := grpc.NewServer()
pb.RegisterRelayServer(s, srv)
logger.Log("addr", *grpcAddr)
errc <- s.Serve(ln)
}()
// Run!
logger.Log("exit", <-errc)
}
func main() {
var (
debugAddr = flag.String("debug.addr", ":8080", "Debug and metrics listen address")
httpAddr = flag.String("http.addr", ":8081", "HTTP listen address")
grpcAddr = flag.String("grpc.addr", ":8082", "gRPC (HTTP) listen address")
thriftAddr = flag.String("thrift.addr", ":8083", "Thrift listen address")
thriftProtocol = flag.String("thrift.protocol", "binary", "binary, compact, json, simplejson")
thriftBufferSize = flag.Int("thrift.buffer.size", 0, "0 for unbuffered")
thriftFramed = flag.Bool("thrift.framed", false, "true to enable framing")
zipkinAddr = flag.String("zipkin.addr", "", "Enable Zipkin tracing via a Kafka server host:port")
appdashAddr = flag.String("appdash.addr", "", "Enable Appdash tracing via an Appdash server host:port")
lightstepToken = flag.String("lightstep.token", "", "Enable LightStep tracing via a LightStep access token")
)
flag.Parse()
// Logging domain.
var logger log.Logger
{
logger = log.NewLogfmtLogger(os.Stdout)
logger = log.NewContext(logger).With("ts", log.DefaultTimestampUTC)
logger = log.NewContext(logger).With("caller", log.DefaultCaller)
}
logger.Log("msg", "hello")
defer logger.Log("msg", "goodbye")
// Metrics domain.
var ints, chars metrics.Counter
{
// Business level metrics.
ints = prometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "addsvc",
Name: "integers_summed",
Help: "Total count of integers summed via the Sum method.",
}, []string{})
chars = prometheus.NewCounterFrom(stdprometheus.CounterOpts{
Namespace: "addsvc",
Name: "characters_concatenated",
Help: "Total count of characters concatenated via the Concat method.",
}, []string{})
}
var duration metrics.Histogram
{
// Transport level metrics.
duration = prometheus.NewSummaryFrom(stdprometheus.SummaryOpts{
Namespace: "addsvc",
Name: "request_duration_ns",
Help: "Request duration in nanoseconds.",
}, []string{"method", "success"})
}
// Tracing domain.
var tracer stdopentracing.Tracer
{
if *zipkinAddr != "" {
logger := log.NewContext(logger).With("tracer", "Zipkin")
logger.Log("addr", *zipkinAddr)
collector, err := zipkin.NewKafkaCollector(
strings.Split(*zipkinAddr, ","),
zipkin.KafkaLogger(logger),
)
if err != nil {
logger.Log("err", err)
os.Exit(1)
}
tracer, err = zipkin.NewTracer(
zipkin.NewRecorder(collector, false, "localhost:80", "addsvc"),
)
if err != nil {
logger.Log("err", err)
os.Exit(1)
}
} else if *appdashAddr != "" {
logger := log.NewContext(logger).With("tracer", "Appdash")
logger.Log("addr", *appdashAddr)
tracer = appdashot.NewTracer(appdash.NewRemoteCollector(*appdashAddr))
} else if *lightstepToken != "" {
logger := log.NewContext(logger).With("tracer", "LightStep")
logger.Log() // probably don't want to print out the token :)
tracer = lightstep.NewTracer(lightstep.Options{
AccessToken: *lightstepToken,
})
defer lightstep.FlushLightStepTracer(tracer)
} else {
logger := log.NewContext(logger).With("tracer", "none")
logger.Log()
tracer = stdopentracing.GlobalTracer() // no-op
}
}
// Business domain.
var service addsvc.Service
{
service = addsvc.NewBasicService()
service = addsvc.ServiceLoggingMiddleware(logger)(service)
service = addsvc.ServiceInstrumentingMiddleware(ints, chars)(service)
}
// Endpoint domain.
var sumEndpoint endpoint.Endpoint
{
sumDuration := duration.With("method", "Sum")
sumLogger := log.NewContext(logger).With("method", "Sum")
sumEndpoint = addsvc.MakeSumEndpoint(service)
sumEndpoint = opentracing.TraceServer(tracer, "Sum")(sumEndpoint)
sumEndpoint = addsvc.EndpointInstrumentingMiddleware(sumDuration)(sumEndpoint)
sumEndpoint = addsvc.EndpointLoggingMiddleware(sumLogger)(sumEndpoint)
}
var concatEndpoint endpoint.Endpoint
{
concatDuration := duration.With("method", "Concat")
concatLogger := log.NewContext(logger).With("method", "Concat")
concatEndpoint = addsvc.MakeConcatEndpoint(service)
concatEndpoint = opentracing.TraceServer(tracer, "Concat")(concatEndpoint)
concatEndpoint = addsvc.EndpointInstrumentingMiddleware(concatDuration)(concatEndpoint)
concatEndpoint = addsvc.EndpointLoggingMiddleware(concatLogger)(concatEndpoint)
}
endpoints := addsvc.Endpoints{
SumEndpoint: sumEndpoint,
ConcatEndpoint: concatEndpoint,
}
// Mechanical domain.
errc := make(chan error)
ctx := context.Background()
// Interrupt handler.
go func() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
errc <- fmt.Errorf("%s", <-c)
}()
// Debug listener.
go func() {
logger := log.NewContext(logger).With("transport", "debug")
m := http.NewServeMux()
m.Handle("/debug/pprof/", http.HandlerFunc(pprof.Index))
m.Handle("/debug/pprof/cmdline", http.HandlerFunc(pprof.Cmdline))
m.Handle("/debug/pprof/profile", http.HandlerFunc(pprof.Profile))
m.Handle("/debug/pprof/symbol", http.HandlerFunc(pprof.Symbol))
m.Handle("/debug/pprof/trace", http.HandlerFunc(pprof.Trace))
m.Handle("/metrics", stdprometheus.Handler())
logger.Log("addr", *debugAddr)
errc <- http.ListenAndServe(*debugAddr, m)
}()
// HTTP transport.
go func() {
logger := log.NewContext(logger).With("transport", "HTTP")
h := addsvc.MakeHTTPHandler(ctx, endpoints, tracer, logger)
logger.Log("addr", *httpAddr)
errc <- http.ListenAndServe(*httpAddr, h)
}()
// gRPC transport.
go func() {
logger := log.NewContext(logger).With("transport", "gRPC")
ln, err := net.Listen("tcp", *grpcAddr)
if err != nil {
errc <- err
return
}
srv := addsvc.MakeGRPCServer(ctx, endpoints, tracer, logger)
s := grpc.NewServer()
pb.RegisterAddServer(s, srv)
logger.Log("addr", *grpcAddr)
errc <- s.Serve(ln)
}()
// Thrift transport.
go func() {
logger := log.NewContext(logger).With("transport", "Thrift")
var protocolFactory thrift.TProtocolFactory
switch *thriftProtocol {
case "binary":
protocolFactory = thrift.NewTBinaryProtocolFactoryDefault()
case "compact":
protocolFactory = thrift.NewTCompactProtocolFactory()
case "json":
protocolFactory = thrift.NewTJSONProtocolFactory()
case "simplejson":
protocolFactory = thrift.NewTSimpleJSONProtocolFactory()
default:
errc <- fmt.Errorf("invalid Thrift protocol %q", *thriftProtocol)
return
}
var transportFactory thrift.TTransportFactory
if *thriftBufferSize > 0 {
transportFactory = thrift.NewTBufferedTransportFactory(*thriftBufferSize)
} else {
transportFactory = thrift.NewTTransportFactory()
}
if *thriftFramed {
transportFactory = thrift.NewTFramedTransportFactory(transportFactory)
}
transport, err := thrift.NewTServerSocket(*thriftAddr)
if err != nil {
errc <- err
return
}
logger.Log("addr", *thriftAddr)
errc <- thrift.NewTSimpleServer4(
thriftadd.NewAddServiceProcessor(addsvc.MakeThriftHandler(ctx, endpoints)),
transport,
transportFactory,
protocolFactory,
).Serve()
}()
// Run!
logger.Log("exit", <-errc)
}