func main() {
var (
listen = flag.String("listen", ":8080", "HTTP listen address")
proxy = flag.String("proxy", "", "Optional comma-separated list of URLs to proxy uppercase requests")
)
flag.Parse()
var logger log.Logger
logger = log.NewLogfmtLogger(os.Stderr)
logger = log.NewContext(logger).With("listen", *listen).With("caller", log.DefaultCaller)
ctx := context.Background()
fieldKeys := []string{"method", "error"}
requestCount := kitprometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "my_group",
Subsystem: "string_service",
Name: "request_count",
Help: "Number of requests received.",
}, fieldKeys)
requestLatency := metrics.NewTimeHistogram(time.Microsecond, kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "my_group",
Subsystem: "string_service",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, fieldKeys))
countResult := kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "my_group",
Subsystem: "string_service",
Name: "count_result",
Help: "The result of each count method.",
}, []string{})
var svc StringService
svc = stringService{}
svc = proxyingMiddleware(*proxy, ctx, logger)(svc)
svc = loggingMiddleware(logger)(svc)
svc = instrumentingMiddleware(requestCount, requestLatency, countResult)(svc)
uppercaseHandler := httptransport.NewServer(
ctx,
makeUppercaseEndpoint(svc),
decodeUppercaseRequest,
encodeResponse,
)
countHandler := httptransport.NewServer(
ctx,
makeCountEndpoint(svc),
decodeCountRequest,
encodeResponse,
)
http.Handle("/uppercase", uppercaseHandler)
http.Handle("/count", countHandler)
http.Handle("/metrics", stdprometheus.Handler())
logger.Log("msg", "HTTP", "addr", *listen)
logger.Log("err", http.ListenAndServe(*listen, nil))
}
func main() {
ctx := context.Background()
logger := log.NewLogfmtLogger(os.Stderr)
fieldKeys := []string{"method", "error"}
requestCount := kitprometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "my_group",
Subsystem: "string_service",
Name: "request_count",
Help: "Number of requests received.",
}, fieldKeys)
requestLatency := metrics.NewTimeHistogram(time.Microsecond, kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "my_group",
Subsystem: "string_service",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, fieldKeys))
countResult := kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "my_group",
Subsystem: "string_service",
Name: "count_result",
Help: "The result of each count method.",
}, []string{}) // no fields here
var svc StringService
svc = stringService{}
svc = loggingMiddleware{logger, svc}
svc = instrumentingMiddleware{requestCount, requestLatency, countResult, svc}
var uppercase endpoint.Endpoint
uppercase = makeUppercaseEndpoint(svc)
var count endpoint.Endpoint
count = makeCountEndpoint(svc)
uppercaseHandler := httptransport.Server{
Context: ctx,
Endpoint: uppercase,
DecodeRequestFunc: decodeUppercaseRequest,
EncodeResponseFunc: encodeResponse,
}
countHandler := httptransport.Server{
Context: ctx,
Endpoint: count,
DecodeRequestFunc: decodeCountRequest,
EncodeResponseFunc: encodeResponse,
}
http.Handle("/uppercase", uppercaseHandler)
http.Handle("/count", countHandler)
http.Handle("/metrics", stdprometheus.Handler())
stdlog.Fatal(http.ListenAndServe(":8080", nil))
}
func main() {
ctx := context.Background()
logger := log.NewLogfmtLogger(os.Stderr)
//Define metrics to be collected for this service
fieldKeys := []string{"method", "error"}
requestCount := kitprometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "my_group",
Subsystem: "string_service",
Name: "request_count",
Help: "Number of requests received.",
}, fieldKeys)
requestLatency := metrics.NewTimeHistogram(time.Microsecond, kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "my_group",
Subsystem: "string_service",
Name: "request_latency_microseconds",
Help: "Total duration of requests in Microseconds.",
}, fieldKeys))
countResult := kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "my_group",
Subsystem: "string_service",
Name: "count_result",
Help: "The result of eac count method",
}, []string{})
//Declare the string service
var svc StringService
svc = stringService{}
svc = loggingMiddleware{logger, svc}
svc = instrumentingMiddleware{requestCount, requestLatency, countResult, svc}
//Declare and define a http server that exposes the string service to clients via httptransport
uppercaseHandler := httptransport.NewServer(
ctx,
makeUppercaseEndpoint(svc),
decodeUppercaseRequest,
encodeResponse,
)
countHandler := httptransport.NewServer(
ctx,
makeCountEndpoint(svc),
decodeCountRequest,
encodeResponse,
)
//Define the content routes
http.Handle("/uppercase", uppercaseHandler)
http.Handle("/count", countHandler)
http.Handle("/metrics", stdprometheus.Handler())
logger.Log("msg", "HTTP", "addr", ":8080")
logger.Log("err", http.ListenAndServe(":8080", nil))
}
func TestPrometheusSummary(t *testing.T) {
h := prometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "test",
Subsystem: "prometheus_summary_histogram",
Name: "foobar",
Help: "Qwerty asdf.",
}, []string{})
const mean, stdev int64 = 50, 10
teststat.PopulateNormalHistogram(t, h, 34, mean, stdev)
teststat.AssertPrometheusNormalSummary(t, "test_prometheus_summary_histogram_foobar", mean, stdev)
}
func TestMultiHistogram(t *testing.T) {
quantiles := []int{50, 90, 99}
h := metrics.NewMultiHistogram(
expvar.NewHistogram("omicron", 0, 100, 3, quantiles...),
prometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "test",
Subsystem: "multi_histogram",
Name: "nu",
Help: "Nu histogram.",
}, []string{}),
)
const seed, mean, stdev int64 = 123, 50, 10
populateNormalHistogram(t, h, seed, mean, stdev)
assertExpvarNormalHistogram(t, "omicron", mean, stdev, quantiles)
assertPrometheusNormalHistogram(t, `test_multi_histogram_nu`, mean, stdev)
}
func main() {
var (
listen = flag.String("listen", ":8080", "HTTP listen address")
target = flag.String("proxy", "https://www.marksandspencer.com", "target URL for reverse proxy")
)
flag.Parse()
var logger log.Logger
logger = log.NewLogfmtLogger(os.Stderr)
logger = log.NewContext(logger).With("listen", *listen).With("caller", log.DefaultCaller)
fieldKeys := []string{"method", "error"}
requestCount := kitprometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "my_group",
Subsystem: "string_service",
Name: "request_count",
Help: "Number of requests received.",
}, fieldKeys)
requestLatency := metrics.NewTimeHistogram(time.Microsecond, kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "my_group",
Subsystem: "string_service",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, fieldKeys))
u, err := url.Parse(*target)
if err != nil {
logger.Log(err)
}
var svc http.Handler
svc = newReverseProxy(u)
svc = loggingMiddleware(logger)(svc)
svc = instrumentingMiddleware(requestCount, requestLatency)(svc)
http.Handle("/", svc)
http.Handle("/_metrics", stdprometheus.Handler())
logger.Log("msg", "HTTP", "addr", *listen)
logger.Log("err", http.ListenAndServe(*listen, nil))
}
func Register() {
ctx := context.Background()
fieldKeys := []string{"method", "error"}
requestCount := gkprometheus.NewCounter(prometheus.CounterOpts{
Namespace: "blueplanet",
Subsystem: "bp2_service",
Name: "request_count",
Help: "Number of requests received.",
}, fieldKeys)
requestLatency := gkmetrics.NewTimeHistogram(time.Microsecond, gkprometheus.NewSummary(prometheus.SummaryOpts{
Namespace: "blueplanet",
Subsystem: "bp2_service",
Name: "request_latency_microseconds",
Help: "Total duraction of the requests in microseconds.",
}, fieldKeys))
var svc StringService
svc = stringService{}
svc = instrumentingMiddleware{requestCount, requestLatency, svc}
uppercaseHandler := gkhttptransport.NewServer(
ctx,
makeUppercaseEndpoint(svc),
decodeUppercaseRequest,
encodeResponse,
)
countHandler := gkhttptransport.NewServer(
ctx,
makeCountEndpoint(svc),
decodeCountRequest,
encodeResponse,
)
http.Handle("/string/uppercase", uppercaseHandler)
http.Handle("/string/count", countHandler)
http.Handle("/string/metrics", prometheus.Handler())
}
func prometheusMiddleware() func(http.Handler) http.Handler {
requestDuration := prometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "walkhub",
Subsystem: "main",
Name: "request_duration_nanoseconds_count",
Help: "Total time spent serving requests.",
}, []string{
"method",
"url",
})
return func(next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
defer func(begin time.Time) {
requestDuration.
With(metrics.Field{Key: "method", Value: r.Method}).
With(metrics.Field{Key: "url", Value: r.URL.String()}).
Observe(int64(time.Since(begin)))
}(time.Now())
next.ServeHTTP(w, r)
})
}
}
func makeInstrumentation(namespace, name, helpCounter, helpDuration string) (metrics.Counter, metrics.TimeHistogram) {
counter := metrics.NewMultiCounter(
expvar.NewCounter(fmt.Sprintf("requests_%s", name)),
statsd.NewCounter(ioutil.Discard, fmt.Sprintf("requests_%s_total", name), time.Second),
prometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: namespace,
Subsystem: name,
Name: "requests_total",
Help: helpCounter,
}, []string{}),
)
duration := metrics.NewTimeHistogram(time.Nanosecond, metrics.NewMultiHistogram(
expvar.NewHistogram(fmt.Sprintf("duration_%s_nanoseconds_total", name), 0, 1e9, 3, 50, 95, 99),
statsd.NewHistogram(ioutil.Discard, fmt.Sprintf("duration_%s_nanoseconds_total", name), time.Second),
prometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: namespace,
Subsystem: name,
Name: "duration_nanoseconds_total",
Help: helpDuration,
}, []string{}),
))
return counter, duration
}
func main() {
// Flag domain. Note that gRPC transitively registers flags via its import
// of glog. So, we define a new flag set, to keep those domains distinct.
fs := flag.NewFlagSet("", flag.ExitOnError)
var (
debugAddr = fs.String("debug.addr", ":8000", "Address for HTTP debug/instrumentation server")
httpAddr = fs.String("http.addr", ":8001", "Address for HTTP (JSON) server")
grpcAddr = fs.String("grpc.addr", ":8002", "Address for gRPC server")
netrpcAddr = fs.String("netrpc.addr", ":8003", "Address for net/rpc server")
thriftAddr = fs.String("thrift.addr", ":8004", "Address for Thrift server")
thriftProtocol = fs.String("thrift.protocol", "binary", "binary, compact, json, simplejson")
thriftBufferSize = fs.Int("thrift.buffer.size", 0, "0 for unbuffered")
thriftFramed = fs.Bool("thrift.framed", false, "true to enable framing")
// Supported OpenTracing backends
zipkinAddr = fs.String("zipkin.kafka.addr", "", "Enable Zipkin tracing via a Kafka server host:port")
appdashAddr = fs.String("appdash.addr", "", "Enable Appdash tracing via an Appdash server host:port")
lightstepAccessToken = fs.String("lightstep.token", "", "Enable LightStep tracing via a LightStep access token")
)
flag.Usage = fs.Usage // only show our flags
if err := fs.Parse(os.Args[1:]); err != nil {
fmt.Fprintf(os.Stderr, "%v", err)
os.Exit(1)
}
// package log
var logger log.Logger
{
logger = log.NewLogfmtLogger(os.Stderr)
logger = log.NewContext(logger).With("ts", log.DefaultTimestampUTC).With("caller", log.DefaultCaller)
stdlog.SetFlags(0) // flags are handled by Go kit's logger
stdlog.SetOutput(log.NewStdlibAdapter(logger)) // redirect anything using stdlib log to us
}
// package metrics
var requestDuration metrics.TimeHistogram
{
requestDuration = metrics.NewTimeHistogram(time.Nanosecond, metrics.NewMultiHistogram(
"request_duration_ns",
expvar.NewHistogram("request_duration_ns", 0, 5e9, 1, 50, 95, 99),
prometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "myorg",
Subsystem: "addsvc",
Name: "duration_ns",
Help: "Request duration in nanoseconds.",
}, []string{"method"}),
))
}
// Set up OpenTracing
var tracer opentracing.Tracer
{
switch {
case *appdashAddr != "" && *lightstepAccessToken == "" && *zipkinAddr == "":
tracer = appdashot.NewTracer(appdash.NewRemoteCollector(*appdashAddr))
case *appdashAddr == "" && *lightstepAccessToken != "" && *zipkinAddr == "":
tracer = lightstep.NewTracer(lightstep.Options{
AccessToken: *lightstepAccessToken,
})
defer lightstep.FlushLightStepTracer(tracer)
case *appdashAddr == "" && *lightstepAccessToken == "" && *zipkinAddr != "":
collector, err := zipkin.NewKafkaCollector(
strings.Split(*zipkinAddr, ","),
zipkin.KafkaLogger(logger),
)
if err != nil {
logger.Log("err", "unable to create collector", "fatal", err)
os.Exit(1)
}
tracer, err = zipkin.NewTracer(
zipkin.NewRecorder(collector, false, "localhost:80", "addsvc"),
)
if err != nil {
logger.Log("err", "unable to create zipkin tracer", "fatal", err)
os.Exit(1)
}
case *appdashAddr == "" && *lightstepAccessToken == "" && *zipkinAddr == "":
tracer = opentracing.GlobalTracer() // no-op
default:
logger.Log("fatal", "specify a single -appdash.addr, -lightstep.access.token or -zipkin.kafka.addr")
os.Exit(1)
}
}
// Business domain
var svc server.AddService
{
svc = pureAddService{}
svc = loggingMiddleware{svc, logger}
svc = instrumentingMiddleware{svc, requestDuration}
}
// Mechanical stuff
rand.Seed(time.Now().UnixNano())
root := context.Background()
errc := make(chan error)
go func() {
errc <- interrupt()
}()
// Debug/instrumentation
go func() {
transportLogger := log.NewContext(logger).With("transport", "debug")
transportLogger.Log("addr", *debugAddr)
errc <- http.ListenAndServe(*debugAddr, nil) // DefaultServeMux
}()
// Transport: HTTP/JSON
go func() {
var (
transportLogger = log.NewContext(logger).With("transport", "HTTP/JSON")
tracingLogger = log.NewContext(transportLogger).With("component", "tracing")
mux = http.NewServeMux()
sum, concat endpoint.Endpoint
)
sum = makeSumEndpoint(svc)
sum = kitot.TraceServer(tracer, "sum")(sum)
mux.Handle("/sum", httptransport.NewServer(
root,
sum,
server.DecodeSumRequest,
server.EncodeSumResponse,
httptransport.ServerErrorLogger(transportLogger),
httptransport.ServerBefore(kitot.FromHTTPRequest(tracer, "sum", tracingLogger)),
))
concat = makeConcatEndpoint(svc)
concat = kitot.TraceServer(tracer, "concat")(concat)
mux.Handle("/concat", httptransport.NewServer(
root,
concat,
server.DecodeConcatRequest,
server.EncodeConcatResponse,
httptransport.ServerErrorLogger(transportLogger),
httptransport.ServerBefore(kitot.FromHTTPRequest(tracer, "concat", tracingLogger)),
))
transportLogger.Log("addr", *httpAddr)
errc <- http.ListenAndServe(*httpAddr, mux)
}()
// Transport: gRPC
go func() {
transportLogger := log.NewContext(logger).With("transport", "gRPC")
tracingLogger := log.NewContext(transportLogger).With("component", "tracing")
ln, err := net.Listen("tcp", *grpcAddr)
if err != nil {
errc <- err
return
}
s := grpc.NewServer() // uses its own, internal context
pb.RegisterAddServer(s, newGRPCBinding(root, tracer, svc, tracingLogger))
transportLogger.Log("addr", *grpcAddr)
errc <- s.Serve(ln)
}()
// Transport: net/rpc
go func() {
transportLogger := log.NewContext(logger).With("transport", "net/rpc")
s := rpc.NewServer()
if err := s.RegisterName("addsvc", netrpcBinding{svc}); err != nil {
errc <- err
return
}
s.HandleHTTP(rpc.DefaultRPCPath, rpc.DefaultDebugPath)
transportLogger.Log("addr", *netrpcAddr)
errc <- http.ListenAndServe(*netrpcAddr, s)
}()
// Transport: Thrift
go func() {
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
}
transportLogger := log.NewContext(logger).With("transport", "thrift")
transportLogger.Log("addr", *thriftAddr)
errc <- thrift.NewTSimpleServer4(
thriftadd.NewAddServiceProcessor(thriftBinding{svc}),
transport,
transportFactory,
protocolFactory,
).Serve()
}()
logger.Log("fatal", <-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.NewCounter(stdprometheus.CounterOpts{
Namespace: "addsvc",
Name: "integers_summed",
Help: "Total count of integers summed via the Sum method.",
}, []string{})
chars = prometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "addsvc",
Name: "characters_concatenated",
Help: "Total count of characters concatenated via the Concat method.",
}, []string{})
}
var duration metrics.TimeHistogram
{
// Transport level metrics.
duration = metrics.NewTimeHistogram(time.Nanosecond, prometheus.NewSummary(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(metrics.Field{Key: "method", Value: "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(metrics.Field{Key: "method", Value: "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)
}
func main() {
fieldKeys := []string{"method", "error"}
requestCount := kitprometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "user_srv",
Subsystem: "account_service",
Name: "request_count",
Help: "Number of requests received.",
}, fieldKeys)
requestLatency := metrics.NewTimeHistogram(time.Microsecond, kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "user_srv",
Subsystem: "account_service",
Name: "request_latency",
Help: "Total duration of requests in microseconds.",
}, fieldKeys))
countResult := kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "user_srv",
Subsystem: "account_service",
Name: "count_result",
Help: "The result of each count method.",
}, []string{})
var ctx context.Context
{
ctx = context.Background()
}
var logger log.Logger
{
logger = log.NewLogfmtLogger(os.Stderr)
}
var db batallion.Database
{
db = batallion.Database{
Host: "localhost",
Name: "micro",
}
}
db.Connect()
var svc batallion.AccountService
{
svc = batallion.AccountSvc{Collection: db.Handler.C("accounts")}
svc = batallion.LoggingMiddleware{logger, svc}
svc = batallion.InstrumentingMiddleware{requestCount, requestLatency, countResult, svc}
}
var h http.Handler
{
h = batallion.MakeHTTPHandler(ctx, svc, log.NewContext(logger).With("component", "HTTP"))
}
errs := make(chan error)
go func() {
logger.Log("transport", "HTTP", "addr", "8010")
errs <- http.ListenAndServe(":8010", h)
}()
logger.Log("exit", <-errs)
}
func main() {
// Flag domain. Note that gRPC transitively registers flags via its import
// of glog. So, we define a new flag set, to keep those domains distinct.
fs := flag.NewFlagSet("", flag.ExitOnError)
var (
debugAddr = fs.String("debug.addr", ":8000", "Address for HTTP debug/instrumentation server")
httpAddr = fs.String("http.addr", ":8001", "Address for HTTP (JSON) server")
grpcAddr = fs.String("grpc.addr", ":8002", "Address for gRPC server")
netrpcAddr = fs.String("netrpc.addr", ":8003", "Address for net/rpc server")
thriftAddr = fs.String("thrift.addr", ":8004", "Address for Thrift server")
thriftProtocol = fs.String("thrift.protocol", "binary", "binary, compact, json, simplejson")
thriftBufferSize = fs.Int("thrift.buffer.size", 0, "0 for unbuffered")
thriftFramed = fs.Bool("thrift.framed", false, "true to enable framing")
zipkinHostPort = fs.String("zipkin.host.port", "my.service.domain:12345", "Zipkin host:port")
zipkinServiceName = fs.String("zipkin.service.name", "addsvc", "Zipkin service name")
zipkinCollectorAddr = fs.String("zipkin.collector.addr", "", "Zipkin Scribe collector address (empty will log spans)")
zipkinCollectorTimeout = fs.Duration("zipkin.collector.timeout", time.Second, "Zipkin collector timeout")
zipkinCollectorBatchSize = fs.Int("zipkin.collector.batch.size", 100, "Zipkin collector batch size")
zipkinCollectorBatchInterval = fs.Duration("zipkin.collector.batch.interval", time.Second, "Zipkin collector batch interval")
)
flag.Usage = fs.Usage // only show our flags
if err := fs.Parse(os.Args[1:]); err != nil {
fmt.Fprintf(os.Stderr, "%v", err)
os.Exit(1)
}
// package log
var logger log.Logger
{
logger = log.NewLogfmtLogger(os.Stderr)
logger = log.NewContext(logger).With("ts", log.DefaultTimestampUTC).With("caller", log.DefaultCaller)
stdlog.SetFlags(0) // flags are handled by Go kit's logger
stdlog.SetOutput(log.NewStdlibAdapter(logger)) // redirect anything using stdlib log to us
}
// package metrics
var requestDuration metrics.TimeHistogram
{
requestDuration = metrics.NewTimeHistogram(time.Nanosecond, metrics.NewMultiHistogram(
expvar.NewHistogram("request_duration_ns", 0, 5e9, 1, 50, 95, 99),
prometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "myorg",
Subsystem: "addsvc",
Name: "duration_ns",
Help: "Request duration in nanoseconds.",
}, []string{"method"}),
))
}
// package tracing
var collector zipkin.Collector
{
zipkinLogger := log.NewContext(logger).With("component", "zipkin")
collector = loggingCollector{zipkinLogger} // TODO(pb)
if *zipkinCollectorAddr != "" {
var err error
if collector, err = zipkin.NewScribeCollector(
*zipkinCollectorAddr,
*zipkinCollectorTimeout,
zipkin.ScribeBatchSize(*zipkinCollectorBatchSize),
zipkin.ScribeBatchInterval(*zipkinCollectorBatchInterval),
zipkin.ScribeLogger(zipkinLogger),
); err != nil {
zipkinLogger.Log("err", err)
os.Exit(1)
}
}
}
// Business domain
var svc server.AddService
{
svc = pureAddService{}
svc = loggingMiddleware{svc, logger}
svc = instrumentingMiddleware{svc, requestDuration}
}
// Mechanical stuff
rand.Seed(time.Now().UnixNano())
root := context.Background()
errc := make(chan error)
go func() {
errc <- interrupt()
}()
// Debug/instrumentation
go func() {
transportLogger := log.NewContext(logger).With("transport", "debug")
transportLogger.Log("addr", *debugAddr)
errc <- http.ListenAndServe(*debugAddr, nil) // DefaultServeMux
}()
// Transport: HTTP/JSON
go func() {
var (
transportLogger = log.NewContext(logger).With("transport", "HTTP/JSON")
tracingLogger = log.NewContext(transportLogger).With("component", "tracing")
newSumSpan = zipkin.MakeNewSpanFunc(*zipkinHostPort, *zipkinServiceName, "sum")
newConcatSpan = zipkin.MakeNewSpanFunc(*zipkinHostPort, *zipkinServiceName, "concat")
traceSum = zipkin.ToContext(newSumSpan, tracingLogger)
traceConcat = zipkin.ToContext(newConcatSpan, tracingLogger)
mux = http.NewServeMux()
sum, concat endpoint.Endpoint
)
sum = makeSumEndpoint(svc)
sum = zipkin.AnnotateServer(newSumSpan, collector)(sum)
mux.Handle("/sum", httptransport.NewServer(
root,
sum,
server.DecodeSumRequest,
server.EncodeSumResponse,
httptransport.ServerBefore(traceSum),
httptransport.ServerErrorLogger(transportLogger),
))
concat = makeConcatEndpoint(svc)
concat = zipkin.AnnotateServer(newConcatSpan, collector)(concat)
mux.Handle("/concat", httptransport.NewServer(
root,
concat,
server.DecodeConcatRequest,
server.EncodeConcatResponse,
httptransport.ServerBefore(traceConcat),
httptransport.ServerErrorLogger(transportLogger),
))
transportLogger.Log("addr", *httpAddr)
errc <- http.ListenAndServe(*httpAddr, mux)
}()
// Transport: gRPC
go func() {
transportLogger := log.NewContext(logger).With("transport", "gRPC")
ln, err := net.Listen("tcp", *grpcAddr)
if err != nil {
errc <- err
return
}
s := grpc.NewServer() // uses its own, internal context
pb.RegisterAddServer(s, grpcBinding{svc})
transportLogger.Log("addr", *grpcAddr)
errc <- s.Serve(ln)
}()
// Transport: net/rpc
go func() {
transportLogger := log.NewContext(logger).With("transport", "net/rpc")
s := rpc.NewServer()
if err := s.RegisterName("addsvc", netrpcBinding{svc}); err != nil {
errc <- err
return
}
s.HandleHTTP(rpc.DefaultRPCPath, rpc.DefaultDebugPath)
transportLogger.Log("addr", *netrpcAddr)
errc <- http.ListenAndServe(*netrpcAddr, s)
}()
// Transport: Thrift
go func() {
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
}
transportLogger := log.NewContext(logger).With("transport", "net/rpc")
transportLogger.Log("addr", *thriftAddr)
errc <- thrift.NewTSimpleServer4(
thriftadd.NewAddServiceProcessor(thriftBinding{svc}),
transport,
transportFactory,
protocolFactory,
).Serve()
}()
logger.Log("fatal", <-errc)
}
func main() {
// Flag domain. Note that gRPC transitively registers flags via its import
// of glog. So, we define a new flag set, to keep those domains distinct.
fs := flag.NewFlagSet("", flag.ExitOnError)
var (
debugAddr = fs.String("debug.addr", ":8000", "Address for HTTP debug/instrumentation server")
httpAddr = fs.String("http.addr", ":8001", "Address for HTTP (JSON) server")
netrpcAddr = fs.String("netrpc.addr", ":8003", "Address for net/rpc server")
proxyHTTPAddr = fs.String("proxy.http.url", "", "if set, proxy requests over HTTP to this addsvc")
zipkinServiceName = fs.String("zipkin.service.name", "addsvc", "Zipkin service name")
zipkinCollectorAddr = fs.String("zipkin.collector.addr", "", "Zipkin Scribe collector address (empty will log spans)")
zipkinCollectorTimeout = fs.Duration("zipkin.collector.timeout", time.Second, "Zipkin collector timeout")
zipkinCollectorBatchSize = fs.Int("zipkin.collector.batch.size", 100, "Zipkin collector batch size")
zipkinCollectorBatchInterval = fs.Duration("zipkin.collector.batch.interval", time.Second, "Zipkin collector batch interval")
)
flag.Usage = fs.Usage // only show our flags
fs.Parse(os.Args[1:])
// `package log` domain
var logger kitlog.Logger
logger = kitlog.NewLogfmtLogger(os.Stderr)
logger = kitlog.NewContext(logger).With("ts", kitlog.DefaultTimestampUTC)
stdlog.SetOutput(kitlog.NewStdlibAdapter(logger)) // redirect stdlib logging to us
stdlog.SetFlags(0) // flags are handled in our logger
// `package metrics` domain
requests := metrics.NewMultiCounter(
expvar.NewCounter("requests"),
statsd.NewCounter(ioutil.Discard, "requests_total", time.Second),
prometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "addsvc",
Subsystem: "add",
Name: "requests_total",
Help: "Total number of received requests.",
}, []string{}),
)
duration := metrics.NewTimeHistogram(time.Nanosecond, metrics.NewMultiHistogram(
expvar.NewHistogram("duration_nanoseconds_total", 0, 1e9, 3, 50, 95, 99),
statsd.NewHistogram(ioutil.Discard, "duration_nanoseconds_total", time.Second),
prometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "addsvc",
Subsystem: "add",
Name: "duration_nanoseconds_total",
Help: "Total nanoseconds spend serving requests.",
}, []string{}),
))
_, _ = requests, duration
// `package tracing` domain
zipkinHostPort := "localhost:1234" // TODO Zipkin makes overly simple assumptions about services
var zipkinCollector zipkin.Collector = loggingCollector{logger}
if *zipkinCollectorAddr != "" {
var err error
if zipkinCollector, err = zipkin.NewScribeCollector(
*zipkinCollectorAddr,
*zipkinCollectorTimeout,
zipkin.ScribeBatchSize(*zipkinCollectorBatchSize),
zipkin.ScribeBatchInterval(*zipkinCollectorBatchInterval),
zipkin.ScribeLogger(logger),
); err != nil {
logger.Log("err", err)
os.Exit(1)
}
}
zipkinMethodName := "add"
zipkinSpanFunc := zipkin.MakeNewSpanFunc(zipkinHostPort, *zipkinServiceName, zipkinMethodName)
// Our business and operational domain
var a add.Adder = pureAdd{}
if *proxyHTTPAddr != "" {
var e endpoint.Endpoint
e = add.NewAdderAddHTTPClient("GET", *proxyHTTPAddr, zipkin.ToRequest(zipkinSpanFunc))
e = zipkin.AnnotateClient(zipkinSpanFunc, zipkinCollector)(e)
a = add.MakeAdderClient(func(method string) endpoint.Endpoint {
if method != "Add" {
panic(fmt.Errorf("unknown method %s", method))
}
return e
})
}
// This could happen at endpoint level.
// a = logging(logger)(a)
// a = instrument(requests, duration)(a)
// Server domain
var e endpoint.Endpoint
e = add.MakeAdderEndpoints(a).Add
e = zipkin.AnnotateServer(zipkinSpanFunc, zipkinCollector)(e)
// Mechanical stuff
rand.Seed(time.Now().UnixNano())
root := context.Background()
errc := make(chan error)
go func() {
errc <- interrupt()
}()
// Transport: HTTP (debug/instrumentation)
go func() {
logger.Log("addr", *debugAddr, "transport", "debug")
errc <- http.ListenAndServe(*debugAddr, nil)
}()
// Transport: HTTP (JSON)
go func() {
ctx, cancel := context.WithCancel(root)
defer cancel()
before := []httptransport.RequestFunc{zipkin.ToContext(zipkinSpanFunc, logger)}
after := []httptransport.ResponseFunc{}
handler := add.MakeAdderAddHTTPBinding(ctx, e, before, after)
logger.Log("addr", *httpAddr, "transport", "HTTP/JSON")
errc <- http.ListenAndServe(*httpAddr, handler)
}()
// Transport: net/rpc
go func() {
ctx, cancel := context.WithCancel(root)
defer cancel()
s := rpc.NewServer()
s.RegisterName("Add", add.AdderAddNetrpcBinding{ctx, e})
s.HandleHTTP(rpc.DefaultRPCPath, rpc.DefaultDebugPath)
logger.Log("addr", *netrpcAddr, "transport", "net/rpc")
errc <- http.ListenAndServe(*netrpcAddr, s)
}()
logger.Log("fatal", <-errc)
}
func main() {
// Flag domain. Note that gRPC transitively registers flags via its import
// of glog. So, we define a new flag set, to keep those domains distinct.
fs := flag.NewFlagSet("", flag.ExitOnError)
var (
debugAddr = fs.String("debug.addr", ":8000", "Address for HTTP debug/instrumentation server")
httpAddr = fs.String("http.addr", ":8001", "Address for HTTP (JSON) server")
grpcAddr = fs.String("grpc.addr", ":8002", "Address for gRPC server")
netrpcAddr = fs.String("netrpc.addr", ":8003", "Address for net/rpc server")
thriftAddr = fs.String("thrift.addr", ":8004", "Address for Thrift server")
thriftProtocol = fs.String("thrift.protocol", "binary", "binary, compact, json, simplejson")
thriftBufferSize = fs.Int("thrift.buffer.size", 0, "0 for unbuffered")
thriftFramed = fs.Bool("thrift.framed", false, "true to enable framing")
proxyHTTPAddr = fs.String("proxy.http.url", "", "if set, proxy requests over HTTP to this addsvc")
zipkinServiceName = fs.String("zipkin.service.name", "addsvc", "Zipkin service name")
zipkinCollectorAddr = fs.String("zipkin.collector.addr", "", "Zipkin Scribe collector address (empty will log spans)")
zipkinCollectorTimeout = fs.Duration("zipkin.collector.timeout", time.Second, "Zipkin collector timeout")
zipkinCollectorBatchSize = fs.Int("zipkin.collector.batch.size", 100, "Zipkin collector batch size")
zipkinCollectorBatchInterval = fs.Duration("zipkin.collector.batch.interval", time.Second, "Zipkin collector batch interval")
)
flag.Usage = fs.Usage // only show our flags
fs.Parse(os.Args[1:])
// `package log` domain
var logger kitlog.Logger
logger = kitlog.NewLogfmtLogger(os.Stderr)
logger = kitlog.With(logger, "ts", kitlog.DefaultTimestampUTC)
stdlog.SetOutput(kitlog.NewStdlibAdapter(logger)) // redirect stdlib logging to us
stdlog.SetFlags(0) // flags are handled in our logger
// `package metrics` domain
requests := metrics.NewMultiCounter(
expvar.NewCounter("requests"),
statsd.NewCounter(ioutil.Discard, "requests_total", time.Second),
prometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "addsvc",
Subsystem: "add",
Name: "requests_total",
Help: "Total number of received requests.",
}, []string{}),
)
duration := metrics.NewTimeHistogram(time.Nanosecond, metrics.NewMultiHistogram(
expvar.NewHistogram("duration_nanoseconds_total", 0, 1e9, 3, 50, 95, 99),
statsd.NewHistogram(ioutil.Discard, "duration_nanoseconds_total", time.Second),
prometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "addsvc",
Subsystem: "add",
Name: "duration_nanoseconds_total",
Help: "Total nanoseconds spend serving requests.",
}, []string{}),
))
// `package tracing` domain
zipkinHostPort := "localhost:1234" // TODO Zipkin makes overly simple assumptions about services
var zipkinCollector zipkin.Collector = loggingCollector{logger}
if *zipkinCollectorAddr != "" {
var err error
if zipkinCollector, err = zipkin.NewScribeCollector(
*zipkinCollectorAddr,
*zipkinCollectorTimeout,
*zipkinCollectorBatchSize,
*zipkinCollectorBatchInterval,
); err != nil {
logger.Log("err", err)
os.Exit(1)
}
}
zipkinMethodName := "add"
zipkinSpanFunc := zipkin.MakeNewSpanFunc(zipkinHostPort, *zipkinServiceName, zipkinMethodName)
zipkin.Log.Swap(logger) // log diagnostic/error details
// Our business and operational domain
var a Add = pureAdd
if *proxyHTTPAddr != "" {
var e endpoint.Endpoint
e = httpclient.NewClient("GET", *proxyHTTPAddr, zipkin.ToRequest(zipkinSpanFunc))
e = zipkin.AnnotateClient(zipkinSpanFunc, zipkinCollector)(e)
a = proxyAdd(e, logger)
}
a = logging(logger)(a)
a = instrument(requests, duration)(a)
// Server domain
var e endpoint.Endpoint
e = makeEndpoint(a)
e = zipkin.AnnotateServer(zipkinSpanFunc, zipkinCollector)(e)
// Mechanical stuff
rand.Seed(time.Now().UnixNano())
root := context.Background()
errc := make(chan error)
go func() {
errc <- interrupt()
}()
// Transport: HTTP (debug/instrumentation)
go func() {
logger.Log("addr", *debugAddr, "transport", "debug")
errc <- http.ListenAndServe(*debugAddr, nil)
}()
// Transport: HTTP (JSON)
go func() {
ctx, cancel := context.WithCancel(root)
defer cancel()
before := []httptransport.BeforeFunc{zipkin.ToContext(zipkinSpanFunc)}
after := []httptransport.AfterFunc{}
handler := makeHTTPBinding(ctx, e, before, after)
logger.Log("addr", *httpAddr, "transport", "HTTP/JSON")
errc <- http.ListenAndServe(*httpAddr, handler)
}()
// Transport: gRPC
go func() {
ln, err := net.Listen("tcp", *grpcAddr)
if err != nil {
errc <- err
return
}
s := grpc.NewServer() // uses its own context?
pb.RegisterAddServer(s, grpcBinding{e})
logger.Log("addr", *grpcAddr, "transport", "gRPC")
errc <- s.Serve(ln)
}()
// Transport: net/rpc
go func() {
ctx, cancel := context.WithCancel(root)
defer cancel()
s := rpc.NewServer()
s.RegisterName("addsvc", NetrpcBinding{ctx, e})
s.HandleHTTP(rpc.DefaultRPCPath, rpc.DefaultDebugPath)
logger.Log("addr", *netrpcAddr, "transport", "net/rpc")
errc <- http.ListenAndServe(*netrpcAddr, s)
}()
// Transport: Thrift
go func() {
ctx, cancel := context.WithCancel(root)
defer cancel()
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, "transport", "Thrift")
errc <- thrift.NewTSimpleServer4(
thriftadd.NewAddServiceProcessor(thriftBinding{ctx, e}),
transport,
transportFactory,
protocolFactory,
).Serve()
}()
logger.Log("fatal", <-errc)
}
func main() {
fs := flag.NewFlagSet("", flag.ExitOnError)
var (
debugAddr = fs.String("debug.addr", ":8000", "Address for HTTP debug/instrumentation server")
httpAddr = fs.String("http.addr", ":8001", "Address for HTTP (JSON) server")
)
flag.Usage = fs.Usage // only show our flags
if err := fs.Parse(os.Args[1:]); err != nil {
fmt.Fprintf(os.Stderr, "%v", err)
os.Exit(1)
}
// package log
var logger log.Logger
{
logger = log.NewLogfmtLogger(os.Stderr)
logger = log.NewContext(logger).With("ts", log.DefaultTimestampUTC).With("caller", log.DefaultCaller)
stdlog.SetFlags(0) // flags are handled by Go kit's logger
stdlog.SetOutput(log.NewStdlibAdapter(logger)) // redirect anything using stdlib log to us
}
// package metrics
var requestDuration metrics.TimeHistogram
{
requestDuration = metrics.NewTimeHistogram(time.Nanosecond, metrics.NewMultiHistogram(
expvar.NewHistogram("request_duration_ns", 0, 5e9, 1, 50, 95, 99),
prometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "myorg",
Subsystem: "addsvc",
Name: "duration_ns",
Help: "Request duration in nanoseconds.",
}, []string{"method"}),
))
}
// Business domain
var svc server.InfoService
{
svc = pureInfoService{}
svc = loggingMiddleware{svc, logger}
svc = instrumentingMiddleware{svc, requestDuration}
}
// Mechanical stuff
rand.Seed(time.Now().UnixNano())
root := context.Background()
errc := make(chan error)
go func() {
errc <- interrupt()
}()
// Debug/instrumentation
go func() {
transportLogger := log.NewContext(logger).With("transport", "debug")
_ = transportLogger.Log("addr", *debugAddr)
errc <- http.ListenAndServe(*debugAddr, nil) // DefaultServeMux
}()
// Transport: HTTP/JSON
go func() {
var (
transportLogger = log.NewContext(logger).With("transport", "HTTP/JSON")
mux = http.NewServeMux()
hello, host endpoint.Endpoint
)
hello = makeHelloEndpoint(svc)
mux.Handle("/hello", httptransport.NewServer(
root,
hello,
server.DecodeHelloRequest,
server.EncodeHelloResponse,
httptransport.ServerErrorLogger(transportLogger),
))
host = makeHostEndpoint(svc)
mux.Handle("/host", httptransport.NewServer(
root,
host,
server.DecodeHostRequest,
server.EncodeHostResponse,
httptransport.ServerErrorLogger(transportLogger),
))
_ = transportLogger.Log("addr", *httpAddr)
errc <- http.ListenAndServe(*httpAddr, mux)
}()
_ = logger.Log("fatal", <-errc)
}
func main() {
flag.Parse()
// package log
var logger log.Logger
{
logger = log.NewLogfmtLogger(os.Stderr)
logger = log.NewContext(logger).With("ts", log.DefaultTimestampUTC).With("caller", log.DefaultCaller)
stdlog.SetFlags(0) // flags are handled by Go kit's logger
stdlog.SetOutput(log.NewStdlibAdapter(logger)) // redirect anything using stdlib log to us
}
// package metrics
var (
requestCount metrics.Counter
requestLatency metrics.TimeHistogram
)
{
fieldKeys := []string{"method", "error"}
requestCount = kitprometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "gmuch",
Subsystem: "api",
Name: "request_count",
Help: "Number of requests received.",
}, fieldKeys)
requestLatency = metrics.NewTimeHistogram(time.Nanosecond, metrics.NewMultiHistogram(
expvar.NewHistogram("request_duration_ns", 0, 5e9, 1, 50, 95, 99),
kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "gmuch",
Subsystem: "api",
Name: "duration_ns",
Help: "Request duration in nanoseconds.",
}, fieldKeys),
))
}
// Business domain
var g server.GmuchService
{
g = gmuch.New(*dbPath, logger)
g = server.LoggingMiddleware(logger)(g)
g = server.InstrumentingMiddleware(requestCount, requestLatency)(g)
}
// Mechanical stuff
rand.Seed(time.Now().UnixNano())
root := context.Background()
errc := make(chan error)
go func() {
errc <- interrupt()
}()
// Debug/instrumentation
go func() {
transportLogger := log.NewContext(logger).With("transport", "debug")
_ = transportLogger.Log("addr", *debugAddr)
errc <- http.ListenAndServe(*debugAddr, nil) // DefaultServeMux
}()
// Transport: HTTP/JSON
go func() {
transportLogger := log.NewContext(logger).With("transport", "HTTP/JSON")
mux := http.NewServeMux()
mux.Handle("/query", httptransport.NewServer(
root,
shttp.EndpointenizeQuery(g),
shttp.DecodeQueryRequest,
shttp.EncodeQueryResponse,
httptransport.ServerErrorLogger(transportLogger),
))
mux.Handle("/thread", httptransport.NewServer(
root,
shttp.EndpointenizeThread(g),
shttp.DecodeThreadRequest,
shttp.EncodeThreadResponse,
httptransport.ServerErrorLogger(transportLogger),
))
_ = transportLogger.Log("addr", *httpAddr)
errc <- http.ListenAndServe(*httpAddr, mux)
}()
// Transport: gRPC
go func() {
transportLogger := log.NewContext(logger).With("transport", "gRPC")
ln, err := net.Listen("tcp", *grpcAddr)
if err != nil {
errc <- err
return
}
s := grpc.NewServer() // uses its own, internal context
sgrpc.RegisterGmuchServer(s, sgrpc.Binding{g})
_ = transportLogger.Log("addr", *grpcAddr)
errc <- s.Serve(ln)
}()
_ = logger.Log("fatal", <-errc)
}
self = ""
sortBeforeMerge = false
httpBuckets = []float64{199, 299, 399,
400, 403, 404, 411, 412, 499,
500, 501, 502, 503, 504, 599}
counts = expvar.NewMap("counters")
mReqCount = kitprom.NewCounter(prometheus.CounterOpts{
Namespace: "agostle",
Subsystem: "http",
Name: "requests",
Help: "The HTTP requests accepted",
}, []string{"path"})
mReqSize = kitprom.NewSummary(prometheus.SummaryOpts{
Namespace: "agostle",
Subsystem: "http",
Name: "request_size_bytes",
Help: "The request size in bytes",
}, []string{"path"})
mRespStatus = kitprom.NewHistogram(prometheus.HistogramOpts{
Namespace: "agostle",
Subsystem: "http",
Name: "response_status",
Help: "The response status code",
Buckets: httpBuckets,
}, []string{"path"})
mRespSize = kitprom.NewSummary(prometheus.SummaryOpts{
Namespace: "agostle",
Subsystem: "http",
Name: "response_size_bytes",
Help: "The response size in bytes",
}, []string{"path"})
Fetching = kitprometheus.NewGauge(stdprometheus.GaugeOpts{
Namespace: "glia",
Subsystem: "fetcher",
Name: "fetching",
Help: "Number of fetching operations waiting to be processed.",
}, []string{})
Sending = kitprometheus.NewGauge(stdprometheus.GaugeOpts{
Namespace: "glia",
Subsystem: "sender",
Name: "sending",
Help: "Number of sending operations waiting to be processed.",
}, []string{})
FetchLatency = metrics.NewTimeHistogram(time.Microsecond, kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "glia",
Subsystem: "fetcher",
Name: "fetch_latency_microseconds",
Help: "Total duration of fetching in microseconds.",
}, []string{}))
SendLatency = metrics.NewTimeHistogram(time.Microsecond, kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "glia",
Subsystem: "sender",
Name: "send_latency_microseconds",
Help: "Total duration of sending in microseconds.",
}, []string{}))
FetchErrorCount = kitprometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "glia",
Subsystem: "fetcher",
Name: "error_count",
Help: "Total error count of fetching opertation",
func main() {
ctx := context.Background()
logger := log.NewLogfmtLogger(os.Stderr)
// Instrumentation
fieldKeys := []string{"method", "error"}
requestCount := kitprometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "my_group",
Subsystem: "string_service",
Name: "request_count",
Help: "Number of requests received.",
}, fieldKeys)
requestLatency := metrics.NewTimeHistogram(time.Microsecond, kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "my_group",
Subsystem: "string_service",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, fieldKeys))
countResult := kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "my_group",
Subsystem: "string_service",
Name: "count_result",
Help: "The result of each count method.",
}, fieldKeys)
var svc StringService
svc = stringService{}
svc = appLoggingMiddleware{logger, svc}
svc = instrumentationMiddleware{requestCount, requestLatency, countResult, svc}
// Transport Logging
var uppercase endpoint.Endpoint
uppercase = makeUppercaseEndpoint(svc)
uppercase = loggingMiddleware(log.NewContext(logger).With("method", "uppercase"))(uppercase)
var count endpoint.Endpoint
count = makeCountEndpoint(svc)
count = loggingMiddleware(log.NewContext(logger).With("method", "count"))(count)
uppercaseHandler := httptransport.NewServer(
ctx,
// makeUppercaseEndpoint(svc),
uppercase,
decodeUppercaseRequest,
encodeResponse,
)
countHandler := httptransport.NewServer(
ctx,
count,
// makeCountEndpoint(svc)
decodeCountRequest,
encodeResponse,
)
http.Handle("/uppercase", uppercaseHandler)
http.Handle("/count", countHandler)
http.Handle("/metrics", stdprometheus.Handler())
_ = logger.Log("msg", "HTTP", "addr", ":8080")
_ = logger.Log("err", http.ListenAndServe(":8080", nil))
}
func main() {
var (
addr = envString("PORT", defaultPort)
rsurl = envString("ROUTINGSERVICE_URL", defaultRoutingServiceURL)
httpAddr = flag.String("http.addr", ":"+addr, "HTTP listen address")
routingServiceURL = flag.String("service.routing", rsurl, "routing service URL")
ctx = context.Background()
)
flag.Parse()
var logger log.Logger
logger = log.NewLogfmtLogger(os.Stderr)
logger = &serializedLogger{Logger: logger}
logger = log.NewContext(logger).With("ts", log.DefaultTimestampUTC)
var (
cargos = repository.NewCargo()
locations = repository.NewLocation()
voyages = repository.NewVoyage()
handlingEvents = repository.NewHandlingEvent()
)
// Configure some questionable dependencies.
var (
handlingEventFactory = cargo.HandlingEventFactory{
CargoRepository: cargos,
VoyageRepository: voyages,
LocationRepository: locations,
}
handlingEventHandler = handling.NewEventHandler(
inspection.NewService(cargos, handlingEvents, nil),
)
)
// Facilitate testing by adding some cargos.
storeTestData(cargos)
fieldKeys := []string{"method"}
var rs routing.Service
rs = routing.NewProxyingMiddleware(*routingServiceURL, ctx)(rs)
var bs booking.Service
bs = booking.NewService(cargos, locations, handlingEvents, rs)
bs = booking.NewLoggingService(log.NewContext(logger).With("component", "booking"), bs)
bs = booking.NewInstrumentingService(
kitprometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "api",
Subsystem: "booking_service",
Name: "request_count",
Help: "Number of requests received.",
}, fieldKeys),
metrics.NewTimeHistogram(time.Microsecond, kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "api",
Subsystem: "booking_service",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, fieldKeys)), bs)
var ts tracking.Service
ts = tracking.NewService(cargos, handlingEvents)
ts = tracking.NewLoggingService(log.NewContext(logger).With("component", "tracking"), ts)
ts = tracking.NewInstrumentingService(
kitprometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "api",
Subsystem: "tracking_service",
Name: "request_count",
Help: "Number of requests received.",
}, fieldKeys),
metrics.NewTimeHistogram(time.Microsecond, kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "api",
Subsystem: "tracking_service",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, fieldKeys)), ts)
var hs handling.Service
hs = handling.NewService(handlingEvents, handlingEventFactory, handlingEventHandler)
hs = handling.NewLoggingService(log.NewContext(logger).With("component", "handling"), hs)
hs = handling.NewInstrumentingService(
kitprometheus.NewCounter(stdprometheus.CounterOpts{
Namespace: "api",
Subsystem: "handling_service",
Name: "request_count",
Help: "Number of requests received.",
}, fieldKeys),
metrics.NewTimeHistogram(time.Microsecond, kitprometheus.NewSummary(stdprometheus.SummaryOpts{
Namespace: "api",
Subsystem: "handling_service",
Name: "request_latency_microseconds",
Help: "Total duration of requests in microseconds.",
}, fieldKeys)), hs)
httpLogger := log.NewContext(logger).With("component", "http")
mux := http.NewServeMux()
mux.Handle("/booking/v1/", booking.MakeHandler(ctx, bs, httpLogger))
mux.Handle("/tracking/v1/", tracking.MakeHandler(ctx, ts, httpLogger))
mux.Handle("/handling/v1/", handling.MakeHandler(ctx, hs, httpLogger))
http.Handle("/", accessControl(mux))
http.Handle("/metrics", stdprometheus.Handler())
errs := make(chan error, 2)
go func() {
logger.Log("transport", "http", "address", *httpAddr, "msg", "listening")
errs <- http.ListenAndServe(*httpAddr, nil)
}()
go func() {
c := make(chan os.Signal)
signal.Notify(c, syscall.SIGINT)
errs <- fmt.Errorf("%s", <-c)
}()
logger.Log("terminated", <-errs)
}
