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transport.go
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transport.go
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package httptransport
import (
"context"
"fmt"
"net/http"
"os"
"os/signal"
"sort"
"syscall"
"time"
"github.com/julienschmidt/httprouter"
"github.com/pkg/errors"
"github.com/machinefi/w3bstream/pkg/depends/conf/log"
"github.com/machinefi/w3bstream/pkg/depends/kit/httptransport/handlers"
"github.com/machinefi/w3bstream/pkg/depends/kit/httptransport/transformer"
"github.com/machinefi/w3bstream/pkg/depends/kit/kit"
"github.com/machinefi/w3bstream/pkg/depends/kit/validator"
_ "github.com/machinefi/w3bstream/pkg/depends/kit/validator/strfmt"
)
func MiddlewareChain(mw ...HttpMiddleware) HttpMiddleware {
return func(final http.Handler) http.Handler {
last := final
for i := len(mw) - 1; i >= 0; i-- {
last = mw[i](last)
}
return last
}
}
type HttpMiddleware func(http.Handler) http.Handler
func NewHttpTransport(modifiers ...ServerModifier) *HttpTransport {
return &HttpTransport{Modifiers: modifiers}
}
type HttpTransport struct {
ServiceMeta
Port int
Modifiers []ServerModifier // for modifying http.Server
Middlewares []HttpMiddleware // Middlewares https://github.com/gorilla/handlers
Vldt validator.Factory // Vldt validator factory
Tsfm transformer.Factory // transformer mgr for parameter transforming
CertFile string
KeyFile string
httpRouter *httprouter.Router
}
type ServerModifier func(server *http.Server) error
func (t *HttpTransport) SetDefault() {
t.ServiceMeta.SetDefault()
if t.Vldt == nil {
t.Vldt = validator.DefaultFactory
}
if t.Tsfm == nil {
t.Tsfm = transformer.DefaultFactory
}
if t.Middlewares == nil {
t.Middlewares = []HttpMiddleware{handlers.LogHandler()}
}
if t.Port == 0 {
t.Port = 80
}
}
func (t *HttpTransport) ServeHTTP(w http.ResponseWriter, req *http.Request) {
t.httpRouter.ServeHTTP(w, req)
}
func (t *HttpTransport) Serve(router *kit.Router) error {
return t.ServeContext(context.Background(), router)
}
func (t *HttpTransport) ServeContext(ctx context.Context, router *kit.Router) error {
t.SetDefault()
logger := log.FromContext(ctx)
t.httpRouter = t.toHttpRouter(router)
srv := &http.Server{
Addr: fmt.Sprintf(":%d", t.Port),
Handler: MiddlewareChain(t.Middlewares...)(t),
}
for i := range t.Modifiers {
if err := t.Modifiers[i](srv); err != nil {
logger.Fatal(err)
}
}
go func() {
outputln("%s listen on %s", t.ServiceMeta, srv.Addr)
if t.CertFile != "" && t.KeyFile != "" {
if err := srv.ListenAndServeTLS(t.CertFile, t.KeyFile); err != nil {
if err == http.ErrServerClosed {
logger.Error(err)
} else {
logger.Fatal(err)
}
}
return
}
if err := srv.ListenAndServe(); err != nil {
if err == http.ErrServerClosed {
logger.Error(err)
} else {
logger.Fatal(err)
}
}
}()
stopCh := make(chan os.Signal, 1)
signal.Notify(stopCh, os.Interrupt, syscall.SIGTERM)
<-stopCh
timeout := 10 * time.Second
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
logger.Info("shutdowning in %s", timeout)
return srv.Shutdown(ctx)
}
func (t *HttpTransport) toHttpRouter(rt *kit.Router) *httprouter.Router {
routes := rt.Routes()
if len(routes) == 0 {
panic(errors.Errorf(
"need to register Operator to Router %#v before serve", rt,
))
}
metas := make([]*HttpRouteMeta, len(routes))
for i := range routes {
metas[i] = NewHttpRouteMeta(routes[i])
}
router := httprouter.New()
sort.Slice(metas, func(i, j int) bool {
return metas[i].Key() < metas[j].Key()
})
for i := range metas {
route := metas[i]
route.Log()
if err := tryCatch(func() {
router.HandlerFunc(
route.Method(),
route.Path(),
NewRouteHandler(
&t.ServiceMeta,
route,
NewRequestTsfmFactory(t.Tsfm, t.Vldt),
).ServeHTTP,
)
}); err != nil {
panic(errors.Errorf("register http route `%s` failed: %s", route, err))
}
}
return router
}