router.go

package server

// Code auto-generated. Do not edit.

import (
	"log"
	"net/http"
	_ "net/http/pprof"
	"os"
	"path"
	"time"

	"github.com/Clever/go-process-metrics/metrics"
	"github.com/gorilla/mux"
	"github.com/kardianos/osext"
	lightstep "github.com/lightstep/lightstep-tracer-go"
	opentracing "github.com/opentracing/opentracing-go"
	"gopkg.in/Clever/kayvee-go.v6/logger"
	kvMiddleware "gopkg.in/Clever/kayvee-go.v6/middleware"
	"gopkg.in/tylerb/graceful.v1"
)

type contextKey struct{}

// Server defines a HTTP server that implements the Controller interface.
type Server struct {
	// Handler should generally not be changed. It exposed to make testing easier.
	Handler http.Handler
	addr    string
	l       logger.KayveeLogger
}

// Serve starts the server. It will return if an error occurs.
func (s *Server) Serve() error {

	go func() {
		metrics.Log("swagger-test", 1*time.Minute)
	}()

	go func() {
		// This should never return. Listen on the pprof port
		log.Printf("PProf server crashed: %s", http.ListenAndServe(":6060", nil))
	}()

	dir, err := osext.ExecutableFolder()
	if err != nil {
		log.Fatal(err)
	}
	if err := logger.SetGlobalRouting(path.Join(dir, "kvconfig.yml")); err != nil {
		s.l.Info("please provide a kvconfig.yml file to enable app log routing")
	}

	if lightstepToken := os.Getenv("LIGHTSTEP_ACCESS_TOKEN"); lightstepToken != "" {
		tags := make(map[string]interface{})
		tags[lightstep.ComponentNameKey] = "swagger-test"
		lightstepTracer := lightstep.NewTracer(lightstep.Options{
			AccessToken: lightstepToken,
			Tags:        tags,
			UseGRPC:     true,
		})
		defer lightstep.FlushLightStepTracer(lightstepTracer)
		opentracing.InitGlobalTracer(lightstepTracer)
	} else {
		s.l.Error("please set LIGHTSTEP_ACCESS_TOKEN to enable tracing")
	}

	s.l.Counter("server-started")

	// Give the sever 30 seconds to shut down
	return graceful.RunWithErr(s.addr, 30*time.Second, s.Handler)
}

type handler struct {
	Controller
}

func withMiddleware(serviceName string, router http.Handler, m []func(http.Handler) http.Handler) http.Handler {
	handler := router

	// Wrap the middleware in the opposite order specified so that when called then run
	// in the order specified
	for i := len(m) - 1; i >= 0; i-- {
		handler = m[i](handler)
	}
	handler = TracingMiddleware(handler)
	handler = PanicMiddleware(handler)
	// Logging middleware comes last, i.e. will be run first.
	// This makes it so that other middleware has access to the logger
	// that kvMiddleware injects into the request context.
	handler = kvMiddleware.New(handler, serviceName)
	return handler
}

// New returns a Server that implements the Controller interface. It will start when "Serve" is called.
func New(c Controller, addr string) *Server {
	return NewWithMiddleware(c, addr, []func(http.Handler) http.Handler{})
}

// NewWithMiddleware returns a Server that implemenets the Controller interface. It runs the
// middleware after the built-in middleware (e.g. logging), but before the controller methods.
// The middleware is executed in the order specified. The server will start when "Serve" is called.
func NewWithMiddleware(c Controller, addr string, m []func(http.Handler) http.Handler) *Server {
	router := mux.NewRouter()
	h := handler{Controller: c}

	l := logger.New("swagger-test")

	router.Methods("GET").Path("/v1/books/{id}").HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		logger.FromContext(r.Context()).AddContext("op", "getBook")
		h.GetBookHandler(r.Context(), w, r)
		ctx := WithTracingOpName(r.Context(), "getBook")
		r = r.WithContext(ctx)
	})

	handler := withMiddleware("swagger-test", router, m)
	return &Server{Handler: handler, addr: addr, l: l}
}