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routing-middlewarenhooks.go
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routing-middlewarenhooks.go
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package mvp
import (
"fmt"
"net/http"
"reflect"
)
const (
MwSlotRateLimitAdjustment = "ratelimitconf"
MwSlotRateLimiter = "ratelimit"
)
func (app *App) addBuiltinMiddleware(b *RouteBuilder) {
b.UseIn(MwSlotRateLimitAdjustment, nil)
b.UseIn(MwSlotRateLimiter, app.enforceRateLimit)
}
type middlewareFunc = func(rc *RC) (any, error)
type middlewareSlot struct {
name string
f middlewareFunc
}
type middlewareSlotList []middlewareSlot
func (mwlist middlewareSlotList) Index(name string) int {
if name == "" {
return -1
}
for i, mw := range mwlist {
if mw.name == name {
return i
}
}
return -1
}
func (mwlist middlewareSlotList) Clone() middlewareSlotList {
return append(middlewareSlotList(nil), mwlist...)
}
func (mwlist *middlewareSlotList) Add(name string, f middlewareFunc) {
i := mwlist.Index(name)
if i >= 0 {
(*mwlist)[i].f = f
} else {
*mwlist = append(*mwlist, middlewareSlot{name: name, f: f})
}
}
func adaptMiddleware(f any) func(rc *RC) (any, error) {
switch f := f.(type) {
case nil:
return nil
case func(rc *RC) (any, error):
return f
case func(rc *RC) error:
return func(rc *RC) (any, error) {
err := f(rc)
return nil, err
}
case func(rc *RC):
return func(rc *RC) (any, error) {
f(rc)
return nil, nil
}
case func(w http.ResponseWriter, r *http.Request) bool:
return func(rc *RC) (any, error) {
if f(rc.RespWriter, rc.Request.Request) {
return ResponseHandled{}, nil
}
return nil, nil
}
default:
fv := reflect.ValueOf(f)
if fv.Kind() != reflect.Func {
panic(fmt.Errorf("unsupported middleware type %T", f))
}
ft := fv.Type()
if ft.NumIn() == 1 && ft.NumOut() == 2 && ft.Out(1) == errorType {
if rcf := BaseRC.FacetByPtrType(ft.In(0)); rcf != nil {
return func(rc *RC) (any, error) {
out := fv.Call([]reflect.Value{
reflect.ValueOf(rcf.AnyFrom(rc)),
})
return out[0].Interface(), errFromAny(out[1].Interface())
}
}
} else if ft.NumIn() == 1 && ft.NumOut() == 1 && ft.Out(0) == errorType {
if rcf := BaseRC.FacetByPtrType(ft.In(0)); rcf != nil {
return func(rc *RC) (any, error) {
out := fv.Call([]reflect.Value{
reflect.ValueOf(rcf.AnyFrom(rc)),
})
return nil, errFromAny(out[0].Interface())
}
}
} else if ft.NumIn() == 1 && ft.NumOut() == 0 {
if rcf := BaseRC.FacetByPtrType(ft.In(0)); rcf != nil {
return func(rc *RC) (any, error) {
fv.Call([]reflect.Value{
reflect.ValueOf(rcf.AnyFrom(rc)),
})
return nil, nil
}
}
}
panic(fmt.Errorf("unknown middleware signature %T", f))
}
}