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() {
var (
transport = flag.String("transport", "httpjson", "httpjson, grpc, netrpc, thrift")
httpAddrs = flag.String("http.addrs", "localhost:8001", "Comma-separated list of addresses for HTTP (JSON) servers")
grpcAddrs = flag.String("grpc.addrs", "localhost:8002", "Comma-separated list of addresses for gRPC servers")
netrpcAddrs = flag.String("netrpc.addrs", "localhost:8003", "Comma-separated list of addresses for net/rpc servers")
thriftAddrs = flag.String("thrift.addrs", "localhost:8004", "Comma-separated list of addresses for Thrift servers")
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")
// Two OpenTracing backends (to demonstrate how they can be interchanged):
appdashAddr = flag.String("appdash.addr", "", "Enable Appdash tracing via an Appdash server host:port")
lightstepAccessToken = flag.String("lightstep.token", "", "Enable LightStep tracing via a LightStep access token")
)
flag.Parse()
if len(os.Args) < 4 {
fmt.Fprintf(os.Stderr, "\n%s [flags] method arg1 arg2\n\n", filepath.Base(os.Args[0]))
flag.Usage()
os.Exit(1)
}
randomSeed := time.Now().UnixNano()
root := context.Background()
method, s1, s2 := flag.Arg(0), flag.Arg(1), flag.Arg(2)
var logger log.Logger
logger = log.NewLogfmtLogger(os.Stdout)
logger = log.NewContext(logger).With("caller", log.DefaultCaller)
logger = log.NewContext(logger).With("transport", *transport)
tracingLogger := log.NewContext(logger).With("component", "tracing")
// Set up OpenTracing
var tracer opentracing.Tracer
{
switch {
case *appdashAddr != "" && *lightstepAccessToken == "":
tracer = appdashot.NewTracer(appdash.NewRemoteCollector(*appdashAddr))
case *appdashAddr == "" && *lightstepAccessToken != "":
tracer = lightstep.NewTracer(lightstep.Options{
AccessToken: *lightstepAccessToken,
})
defer lightstep.FlushLightStepTracer(tracer)
case *appdashAddr == "" && *lightstepAccessToken == "":
tracer = opentracing.GlobalTracer() // no-op
default:
panic("specify either -appdash.addr or -lightstep.access.token, not both")
}
}
var (
instances []string
sumFactory, concatFactory loadbalancer.Factory
)
switch *transport {
case "grpc":
instances = strings.Split(*grpcAddrs, ",")
sumFactory = grpcclient.MakeSumEndpointFactory(tracer, tracingLogger)
concatFactory = grpcclient.MakeConcatEndpointFactory(tracer, tracingLogger)
case "httpjson":
instances = strings.Split(*httpAddrs, ",")
for i, rawurl := range instances {
if !strings.HasPrefix("http", rawurl) {
instances[i] = "http://" + rawurl
}
}
sumFactory = httpjsonclient.MakeSumEndpointFactory(tracer, tracingLogger)
concatFactory = httpjsonclient.MakeConcatEndpointFactory(tracer, tracingLogger)
case "netrpc":
instances = strings.Split(*netrpcAddrs, ",")
sumFactory = netrpcclient.SumEndpointFactory
concatFactory = netrpcclient.ConcatEndpointFactory
case "thrift":
instances = strings.Split(*thriftAddrs, ",")
thriftClient := thriftclient.New(*thriftProtocol, *thriftBufferSize, *thriftFramed, logger)
sumFactory = thriftClient.SumEndpoint
concatFactory = thriftClient.ConcatEndpoint
default:
logger.Log("err", "invalid transport")
os.Exit(1)
}
sum := buildEndpoint(tracer, "sum", instances, sumFactory, randomSeed, logger)
concat := buildEndpoint(tracer, "concat", instances, concatFactory, randomSeed, logger)
svc := newClient(root, sum, concat, logger)
begin := time.Now()
switch method {
case "sum":
a, _ := strconv.Atoi(s1)
b, _ := strconv.Atoi(s2)
v := svc.Sum(a, b)
logger.Log("method", "sum", "a", a, "b", b, "v", v, "took", time.Since(begin))
case "concat":
a, b := s1, s2
v := svc.Concat(a, b)
logger.Log("method", "concat", "a", a, "b", b, "v", v, "took", time.Since(begin))
default:
logger.Log("err", "invalid method "+method)
os.Exit(1)
}
}
func main() {
// The addcli presumes no service discovery system, and expects users to
// provide the direct address of an addsvc. This presumption is reflected in
// the addcli binary and the the client packages: the -transport.addr flags
// and various client constructors both expect host:port strings. For an
// example service with a client built on top of a service discovery system,
// see profilesvc.
var (
httpAddr = flag.String("http.addr", "", "HTTP address of addsvc")
grpcAddr = flag.String("grpc.addr", "", "gRPC (HTTP) address of addsvc")
thriftAddr = flag.String("thrift.addr", "", "Thrift address of addsvc")
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 Collector 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")
method = flag.String("method", "sum", "sum, concat")
)
flag.Parse()
if len(flag.Args()) != 2 {
fmt.Fprintf(os.Stderr, "usage: addcli [flags] <a> <b>\n")
os.Exit(1)
}
// This is a demonstration client, which supports multiple tracers.
// Your clients will probably just use one tracer.
var tracer stdopentracing.Tracer
{
if *zipkinAddr != "" {
collector, err := zipkin.NewKafkaCollector(
strings.Split(*zipkinAddr, ","),
zipkin.KafkaLogger(log.NewNopLogger()),
)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
tracer, err = zipkin.NewTracer(
zipkin.NewRecorder(collector, false, "localhost:8000", "addcli"),
)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
} else if *appdashAddr != "" {
tracer = appdashot.NewTracer(appdash.NewRemoteCollector(*appdashAddr))
} else if *lightstepToken != "" {
tracer = lightstep.NewTracer(lightstep.Options{
AccessToken: *lightstepToken,
})
defer lightstep.FlushLightStepTracer(tracer)
} else {
tracer = stdopentracing.GlobalTracer() // no-op
}
}
// This is a demonstration client, which supports multiple transports.
// Your clients will probably just define and stick with 1 transport.
var (
service addsvc.Service
err error
)
if *httpAddr != "" {
service, err = httpclient.New(*httpAddr, tracer, log.NewNopLogger())
} else if *grpcAddr != "" {
conn, err := grpc.Dial(*grpcAddr, grpc.WithInsecure(), grpc.WithTimeout(time.Second))
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v", err)
os.Exit(1)
}
defer conn.Close()
service = grpcclient.New(conn, tracer, log.NewNopLogger())
} else if *thriftAddr != "" {
// It's necessary to do all of this construction in the func main,
// because (among other reasons) we need to control the lifecycle of the
// Thrift transport, i.e. close it eventually.
var protocolFactory thrift.TProtocolFactory
switch *thriftProtocol {
case "compact":
protocolFactory = thrift.NewTCompactProtocolFactory()
case "simplejson":
protocolFactory = thrift.NewTSimpleJSONProtocolFactory()
case "json":
protocolFactory = thrift.NewTJSONProtocolFactory()
case "binary", "":
protocolFactory = thrift.NewTBinaryProtocolFactoryDefault()
default:
fmt.Fprintf(os.Stderr, "error: invalid protocol %q\n", *thriftProtocol)
os.Exit(1)
}
var transportFactory thrift.TTransportFactory
if *thriftBufferSize > 0 {
transportFactory = thrift.NewTBufferedTransportFactory(*thriftBufferSize)
} else {
transportFactory = thrift.NewTTransportFactory()
}
if *thriftFramed {
transportFactory = thrift.NewTFramedTransportFactory(transportFactory)
}
transportSocket, err := thrift.NewTSocket(*thriftAddr)
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
os.Exit(1)
}
transport := transportFactory.GetTransport(transportSocket)
if err := transport.Open(); err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
os.Exit(1)
}
defer transport.Close()
client := thriftadd.NewAddServiceClientFactory(transport, protocolFactory)
service = thriftclient.New(client)
} else {
fmt.Fprintf(os.Stderr, "error: no remote address specified\n")
os.Exit(1)
}
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
os.Exit(1)
}
switch *method {
case "sum":
a, _ := strconv.ParseInt(flag.Args()[0], 10, 64)
b, _ := strconv.ParseInt(flag.Args()[1], 10, 64)
v, err := service.Sum(context.Background(), int(a), int(b))
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
os.Exit(1)
}
fmt.Fprintf(os.Stdout, "%d + %d = %d\n", a, b, v)
case "concat":
a := flag.Args()[0]
b := flag.Args()[1]
v, err := service.Concat(context.Background(), a, b)
if err != nil {
fmt.Fprintf(os.Stderr, "error: %v\n", err)
os.Exit(1)
}
fmt.Fprintf(os.Stdout, "%q + %q = %q\n", a, b, v)
default:
fmt.Fprintf(os.Stderr, "error: invalid method %q\n", method)
os.Exit(1)
}
}