/
main.go
124 lines (106 loc) · 3.16 KB
/
main.go
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package main // import "github.com/pinterb/infosvc"
import (
"flag"
"fmt"
stdlog "log"
"math/rand"
"net/http"
"os"
"os/signal"
"syscall"
"time"
stdprometheus "github.com/prometheus/client_golang/prometheus"
"golang.org/x/net/context"
"github.com/go-kit/kit/endpoint"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/metrics"
"github.com/go-kit/kit/metrics/expvar"
"github.com/go-kit/kit/metrics/prometheus"
httptransport "github.com/go-kit/kit/transport/http"
"github.com/pinterb/infosvc/server"
)
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 interrupt() error {
c := make(chan os.Signal)
signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
return fmt.Errorf("%s", <-c)
}