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router.go
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router.go
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package server
// Code auto-generated. Do not edit.
import (
"fmt"
"io"
"log"
"net/http"
"os"
"path"
"strconv"
"time"
// register pprof listener
_ "net/http/pprof"
"github.com/Clever/go-process-metrics/metrics"
"github.com/gorilla/mux"
"github.com/kardianos/osext"
opentracing "github.com/opentracing/opentracing-go"
jaeger "github.com/uber/jaeger-client-go"
jaegercfg "github.com/uber/jaeger-client-go/config"
"github.com/uber/jaeger-client-go/transport"
"gopkg.in/Clever/kayvee-go.v6/logger"
kvMiddleware "gopkg.in/Clever/kayvee-go.v6/middleware"
"gopkg.in/tylerb/graceful.v1"
)
const (
// lowerBoundRateLimiter determines the lower bound interval that we sample every operation.
// https://godoc.org/github.com/uber/jaeger-client-go#GuaranteedThroughputProbabilisticSampler
lowerBoundRateLimiter = 1.0 / 60 // 1 request/minute/operation
)
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("localhost: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")
}
tracingToken := os.Getenv("TRACING_ACCESS_TOKEN")
ingestURL := os.Getenv("TRACING_INGEST_URL")
isLocal := os.Getenv("_IS_LOCAL") == "true"
if (tracingToken != "" && ingestURL != "") || isLocal {
samplingRate := .01 // 1% of requests
if samplingRateStr := os.Getenv("TRACING_SAMPLING_RATE_PERCENT"); samplingRateStr != "" {
samplingRateP, err := strconv.ParseFloat(samplingRateStr, 64)
if err != nil {
s.l.ErrorD("tracing-sampling-override-failed", logger.M{
"msg": fmt.Sprintf("could not parse '%s' to integer", samplingRateStr),
})
} else {
samplingRate = samplingRateP
}
s.l.InfoD("tracing-sampling-rate", logger.M{
"msg": fmt.Sprintf("sampling rate will be %.3f", samplingRate),
})
}
sampler, err := jaeger.NewGuaranteedThroughputProbabilisticSampler(lowerBoundRateLimiter, samplingRate)
if err != nil {
return fmt.Errorf("failed to build jaeger sampler: %s", err)
}
cfg := &jaegercfg.Configuration{
ServiceName: os.Getenv("_APP_NAME"),
Tags: []opentracing.Tag{
opentracing.Tag{Key: "app_name", Value: os.Getenv("_APP_NAME")},
opentracing.Tag{Key: "build_id", Value: os.Getenv("_BUILD_ID")},
opentracing.Tag{Key: "deploy_env", Value: os.Getenv("_DEPLOY_ENV")},
opentracing.Tag{Key: "team_owner", Value: os.Getenv("_TEAM_OWNER")},
opentracing.Tag{Key: "pod_id", Value: os.Getenv("_POD_ID")},
opentracing.Tag{Key: "pod_account", Value: os.Getenv("_POD_ACCOUNT")},
opentracing.Tag{Key: "pod_region", Value: os.Getenv("_POD_REGION")},
},
}
var tracer opentracing.Tracer
var closer io.Closer
if isLocal {
// when local, send everything and use the default params for the Jaeger collector
cfg.Sampler = &jaegercfg.SamplerConfig{
Type: "const",
Param: 1.0,
}
tracer, closer, err = cfg.NewTracer()
s.l.InfoD("local-tracing", logger.M{"msg": "sending traces to default localhost jaeger address"})
} else {
// Create a Jaeger HTTP Thrift transport
transport := transport.NewHTTPTransport(ingestURL, transport.HTTPBasicAuth("auth", tracingToken))
tracer, closer, err = cfg.NewTracer(
jaegercfg.Reporter(jaeger.NewRemoteReporter(transport)),
jaegercfg.Sampler(sampler))
}
if err != nil {
log.Fatalf("Could not initialize jaeger tracer: %s", err)
}
defer closer.Close()
opentracing.SetGlobalTracer(tracer)
} else {
s.l.Error("please set TRACING_ACCESS_TOKEN & TRACING_INGEST_URL 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{})
}
// NewRouter returns a mux.Router with no middleware. This is so we can attach additional routes to the
// router if necessary
func NewRouter(c Controller) *mux.Router {
return newRouter(c)
}
func newRouter(c Controller) *mux.Router {
router := mux.NewRouter()
h := handler{Controller: c}
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)
})
return router
}
// 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 := newRouter(c)
return AttachMiddleware(router, addr, m)
}
// AttachMiddleware attaches the given middleware to the router; this is to be used in conjunction with
// NewServer. It attaches custom middleware passed as arguments as well as the built-in middleware for
// logging, tracing, and handling panics. It should be noted that the built-in middleware executes first
// followed by the passed in middleware (in the order specified).
func AttachMiddleware(router *mux.Router, addr string, m []func(http.Handler) http.Handler) *Server {
l := logger.New("swagger-test")
handler := withMiddleware("home-auth", router, m)
return &Server{Handler: handler, addr: addr, l: l}
}