mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-05 01:52:46 +00:00
248 lines
7.3 KiB
Go
248 lines
7.3 KiB
Go
package runtime
|
|
|
|
import (
|
|
"context"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"net/http"
|
|
"net/textproto"
|
|
"strconv"
|
|
"strings"
|
|
|
|
"google.golang.org/genproto/googleapis/api/httpbody"
|
|
"google.golang.org/grpc/codes"
|
|
"google.golang.org/grpc/grpclog"
|
|
"google.golang.org/grpc/status"
|
|
"google.golang.org/protobuf/proto"
|
|
)
|
|
|
|
// ForwardResponseStream forwards the stream from gRPC server to REST client.
|
|
func ForwardResponseStream(ctx context.Context, mux *ServeMux, marshaler Marshaler, w http.ResponseWriter, req *http.Request, recv func() (proto.Message, error), opts ...func(context.Context, http.ResponseWriter, proto.Message) error) {
|
|
rc := http.NewResponseController(w)
|
|
md, ok := ServerMetadataFromContext(ctx)
|
|
if !ok {
|
|
grpclog.Error("Failed to extract ServerMetadata from context")
|
|
http.Error(w, "unexpected error", http.StatusInternalServerError)
|
|
return
|
|
}
|
|
handleForwardResponseServerMetadata(w, mux, md)
|
|
|
|
w.Header().Set("Transfer-Encoding", "chunked")
|
|
if err := handleForwardResponseOptions(ctx, w, nil, opts); err != nil {
|
|
HTTPError(ctx, mux, marshaler, w, req, err)
|
|
return
|
|
}
|
|
|
|
var delimiter []byte
|
|
if d, ok := marshaler.(Delimited); ok {
|
|
delimiter = d.Delimiter()
|
|
} else {
|
|
delimiter = []byte("\n")
|
|
}
|
|
|
|
var wroteHeader bool
|
|
for {
|
|
resp, err := recv()
|
|
if errors.Is(err, io.EOF) {
|
|
return
|
|
}
|
|
if err != nil {
|
|
handleForwardResponseStreamError(ctx, wroteHeader, marshaler, w, req, mux, err, delimiter)
|
|
return
|
|
}
|
|
if err := handleForwardResponseOptions(ctx, w, resp, opts); err != nil {
|
|
handleForwardResponseStreamError(ctx, wroteHeader, marshaler, w, req, mux, err, delimiter)
|
|
return
|
|
}
|
|
|
|
respRw, err := mux.forwardResponseRewriter(ctx, resp)
|
|
if err != nil {
|
|
grpclog.Errorf("Rewrite error: %v", err)
|
|
handleForwardResponseStreamError(ctx, wroteHeader, marshaler, w, req, mux, err, delimiter)
|
|
return
|
|
}
|
|
|
|
if !wroteHeader {
|
|
w.Header().Set("Content-Type", marshaler.ContentType(respRw))
|
|
}
|
|
|
|
var buf []byte
|
|
httpBody, isHTTPBody := respRw.(*httpbody.HttpBody)
|
|
switch {
|
|
case respRw == nil:
|
|
buf, err = marshaler.Marshal(errorChunk(status.New(codes.Internal, "empty response")))
|
|
case isHTTPBody:
|
|
buf = httpBody.GetData()
|
|
default:
|
|
result := map[string]interface{}{"result": respRw}
|
|
if rb, ok := respRw.(responseBody); ok {
|
|
result["result"] = rb.XXX_ResponseBody()
|
|
}
|
|
|
|
buf, err = marshaler.Marshal(result)
|
|
}
|
|
|
|
if err != nil {
|
|
grpclog.Errorf("Failed to marshal response chunk: %v", err)
|
|
handleForwardResponseStreamError(ctx, wroteHeader, marshaler, w, req, mux, err, delimiter)
|
|
return
|
|
}
|
|
if _, err := w.Write(buf); err != nil {
|
|
grpclog.Errorf("Failed to send response chunk: %v", err)
|
|
return
|
|
}
|
|
wroteHeader = true
|
|
if _, err := w.Write(delimiter); err != nil {
|
|
grpclog.Errorf("Failed to send delimiter chunk: %v", err)
|
|
return
|
|
}
|
|
err = rc.Flush()
|
|
if err != nil {
|
|
if errors.Is(err, http.ErrNotSupported) {
|
|
grpclog.Errorf("Flush not supported in %T", w)
|
|
http.Error(w, "unexpected type of web server", http.StatusInternalServerError)
|
|
return
|
|
}
|
|
grpclog.Errorf("Failed to flush response to client: %v", err)
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func handleForwardResponseServerMetadata(w http.ResponseWriter, mux *ServeMux, md ServerMetadata) {
|
|
for k, vs := range md.HeaderMD {
|
|
if h, ok := mux.outgoingHeaderMatcher(k); ok {
|
|
for _, v := range vs {
|
|
w.Header().Add(h, v)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func handleForwardResponseTrailerHeader(w http.ResponseWriter, mux *ServeMux, md ServerMetadata) {
|
|
for k := range md.TrailerMD {
|
|
if h, ok := mux.outgoingTrailerMatcher(k); ok {
|
|
w.Header().Add("Trailer", textproto.CanonicalMIMEHeaderKey(h))
|
|
}
|
|
}
|
|
}
|
|
|
|
func handleForwardResponseTrailer(w http.ResponseWriter, mux *ServeMux, md ServerMetadata) {
|
|
for k, vs := range md.TrailerMD {
|
|
if h, ok := mux.outgoingTrailerMatcher(k); ok {
|
|
for _, v := range vs {
|
|
w.Header().Add(h, v)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// responseBody interface contains method for getting field for marshaling to the response body
|
|
// this method is generated for response struct from the value of `response_body` in the `google.api.HttpRule`
|
|
type responseBody interface {
|
|
XXX_ResponseBody() interface{}
|
|
}
|
|
|
|
// ForwardResponseMessage forwards the message "resp" from gRPC server to REST client.
|
|
func ForwardResponseMessage(ctx context.Context, mux *ServeMux, marshaler Marshaler, w http.ResponseWriter, req *http.Request, resp proto.Message, opts ...func(context.Context, http.ResponseWriter, proto.Message) error) {
|
|
md, ok := ServerMetadataFromContext(ctx)
|
|
if !ok {
|
|
grpclog.Error("Failed to extract ServerMetadata from context")
|
|
}
|
|
|
|
handleForwardResponseServerMetadata(w, mux, md)
|
|
|
|
// RFC 7230 https://tools.ietf.org/html/rfc7230#section-4.1.2
|
|
// Unless the request includes a TE header field indicating "trailers"
|
|
// is acceptable, as described in Section 4.3, a server SHOULD NOT
|
|
// generate trailer fields that it believes are necessary for the user
|
|
// agent to receive.
|
|
doForwardTrailers := requestAcceptsTrailers(req)
|
|
|
|
if doForwardTrailers {
|
|
handleForwardResponseTrailerHeader(w, mux, md)
|
|
w.Header().Set("Transfer-Encoding", "chunked")
|
|
}
|
|
|
|
contentType := marshaler.ContentType(resp)
|
|
w.Header().Set("Content-Type", contentType)
|
|
|
|
if err := handleForwardResponseOptions(ctx, w, resp, opts); err != nil {
|
|
HTTPError(ctx, mux, marshaler, w, req, err)
|
|
return
|
|
}
|
|
respRw, err := mux.forwardResponseRewriter(ctx, resp)
|
|
if err != nil {
|
|
grpclog.Errorf("Rewrite error: %v", err)
|
|
HTTPError(ctx, mux, marshaler, w, req, err)
|
|
return
|
|
}
|
|
var buf []byte
|
|
if rb, ok := respRw.(responseBody); ok {
|
|
buf, err = marshaler.Marshal(rb.XXX_ResponseBody())
|
|
} else {
|
|
buf, err = marshaler.Marshal(respRw)
|
|
}
|
|
if err != nil {
|
|
grpclog.Errorf("Marshal error: %v", err)
|
|
HTTPError(ctx, mux, marshaler, w, req, err)
|
|
return
|
|
}
|
|
|
|
if !doForwardTrailers {
|
|
w.Header().Set("Content-Length", strconv.Itoa(len(buf)))
|
|
}
|
|
|
|
if _, err = w.Write(buf); err != nil {
|
|
grpclog.Errorf("Failed to write response: %v", err)
|
|
}
|
|
|
|
if doForwardTrailers {
|
|
handleForwardResponseTrailer(w, mux, md)
|
|
}
|
|
}
|
|
|
|
func requestAcceptsTrailers(req *http.Request) bool {
|
|
te := req.Header.Get("TE")
|
|
return strings.Contains(strings.ToLower(te), "trailers")
|
|
}
|
|
|
|
func handleForwardResponseOptions(ctx context.Context, w http.ResponseWriter, resp proto.Message, opts []func(context.Context, http.ResponseWriter, proto.Message) error) error {
|
|
if len(opts) == 0 {
|
|
return nil
|
|
}
|
|
for _, opt := range opts {
|
|
if err := opt(ctx, w, resp); err != nil {
|
|
return fmt.Errorf("error handling ForwardResponseOptions: %w", err)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func handleForwardResponseStreamError(ctx context.Context, wroteHeader bool, marshaler Marshaler, w http.ResponseWriter, req *http.Request, mux *ServeMux, err error, delimiter []byte) {
|
|
st := mux.streamErrorHandler(ctx, err)
|
|
msg := errorChunk(st)
|
|
if !wroteHeader {
|
|
w.Header().Set("Content-Type", marshaler.ContentType(msg))
|
|
w.WriteHeader(HTTPStatusFromCode(st.Code()))
|
|
}
|
|
buf, err := marshaler.Marshal(msg)
|
|
if err != nil {
|
|
grpclog.Errorf("Failed to marshal an error: %v", err)
|
|
return
|
|
}
|
|
if _, err := w.Write(buf); err != nil {
|
|
grpclog.Errorf("Failed to notify error to client: %v", err)
|
|
return
|
|
}
|
|
if _, err := w.Write(delimiter); err != nil {
|
|
grpclog.Errorf("Failed to send delimiter chunk: %v", err)
|
|
return
|
|
}
|
|
}
|
|
|
|
func errorChunk(st *status.Status) map[string]proto.Message {
|
|
return map[string]proto.Message{"error": st.Proto()}
|
|
}
|