net/http: use net/http/internal/http2 rather than h2_bundle.go

Rework net/http/internal/http2 to use internally-defined types
rather than net/http types (to avoid an import cycle).

Remove h2_bundle.go, and replace it with calls into
net/http/internal/http2 instead.

For #67810

Change-Id: I56a1b28dbd0e302ab15a30f819dd46256a6a6964
Reviewed-on: https://go-review.googlesource.com/c/go/+/751304
Reviewed-by: Nicholas Husin <nsh@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Damien Neil <dneil@google.com>
Reviewed-by: Nicholas Husin <husin@google.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/src/net/http/internal/http2/errors.go b/src/net/http/internal/http2/errors.go
index f2067dabc5..35c34b7ba5 100644
--- a/src/net/http/internal/http2/errors.go
+++ b/src/net/http/internal/http2/errors.go
@@ -7,6 +7,7 @@ package http2
 import (
 	"errors"
 	"fmt"
+	"reflect"
 )
 
 // An ErrCode is an unsigned 32-bit error code as defined in the HTTP/2 spec.
@@ -90,6 +91,33 @@ func (e StreamError) Error() string {
 	return fmt.Sprintf("stream error: stream ID %d; %v", e.StreamID, e.Code)
 }
 
+// This As function permits converting a StreamError into a x/net/http2.StreamError.
+func (e StreamError) As(target any) bool {
+	dst := reflect.ValueOf(target).Elem()
+	dstType := dst.Type()
+	if dstType.Kind() != reflect.Struct {
+		return false
+	}
+	src := reflect.ValueOf(e)
+	srcType := src.Type()
+	numField := srcType.NumField()
+	if dstType.NumField() != numField {
+		return false
+	}
+	for i := 0; i < numField; i++ {
+		sf := srcType.Field(i)
+		df := dstType.Field(i)
+		if sf.Name != df.Name || !sf.Type.ConvertibleTo(df.Type) {
+			return false
+		}
+	}
+	for i := 0; i < numField; i++ {
+		df := dst.Field(i)
+		df.Set(src.Field(i).Convert(df.Type()))
+	}
+	return true
+}
+
 // 6.9.1 The Flow Control Window
 // "If a sender receives a WINDOW_UPDATE that causes a flow control
 // window to exceed this maximum it MUST terminate either the stream