mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-12 10:00:46 +01:00
248 lines
7.3 KiB
Go
248 lines
7.3 KiB
Go
package runtime
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"net/http"
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"net/textproto"
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"strconv"
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"strings"
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"google.golang.org/genproto/googleapis/api/httpbody"
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/grpclog"
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"google.golang.org/grpc/status"
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"google.golang.org/protobuf/proto"
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)
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// ForwardResponseStream forwards the stream from gRPC server to REST client.
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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) {
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rc := http.NewResponseController(w)
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md, ok := ServerMetadataFromContext(ctx)
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if !ok {
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grpclog.Error("Failed to extract ServerMetadata from context")
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http.Error(w, "unexpected error", http.StatusInternalServerError)
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return
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}
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handleForwardResponseServerMetadata(w, mux, md)
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w.Header().Set("Transfer-Encoding", "chunked")
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if err := handleForwardResponseOptions(ctx, w, nil, opts); err != nil {
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HTTPError(ctx, mux, marshaler, w, req, err)
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return
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}
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var delimiter []byte
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if d, ok := marshaler.(Delimited); ok {
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delimiter = d.Delimiter()
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} else {
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delimiter = []byte("\n")
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}
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var wroteHeader bool
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for {
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resp, err := recv()
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if errors.Is(err, io.EOF) {
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return
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}
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if err != nil {
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handleForwardResponseStreamError(ctx, wroteHeader, marshaler, w, req, mux, err, delimiter)
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return
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}
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if err := handleForwardResponseOptions(ctx, w, resp, opts); err != nil {
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handleForwardResponseStreamError(ctx, wroteHeader, marshaler, w, req, mux, err, delimiter)
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return
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}
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respRw, err := mux.forwardResponseRewriter(ctx, resp)
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if err != nil {
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grpclog.Errorf("Rewrite error: %v", err)
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handleForwardResponseStreamError(ctx, wroteHeader, marshaler, w, req, mux, err, delimiter)
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return
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}
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if !wroteHeader {
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w.Header().Set("Content-Type", marshaler.ContentType(respRw))
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}
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var buf []byte
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httpBody, isHTTPBody := respRw.(*httpbody.HttpBody)
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switch {
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case respRw == nil:
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buf, err = marshaler.Marshal(errorChunk(status.New(codes.Internal, "empty response")))
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case isHTTPBody:
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buf = httpBody.GetData()
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default:
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result := map[string]interface{}{"result": respRw}
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if rb, ok := respRw.(responseBody); ok {
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result["result"] = rb.XXX_ResponseBody()
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}
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buf, err = marshaler.Marshal(result)
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}
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if err != nil {
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grpclog.Errorf("Failed to marshal response chunk: %v", err)
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handleForwardResponseStreamError(ctx, wroteHeader, marshaler, w, req, mux, err, delimiter)
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return
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}
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if _, err := w.Write(buf); err != nil {
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grpclog.Errorf("Failed to send response chunk: %v", err)
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return
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}
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wroteHeader = true
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if _, err := w.Write(delimiter); err != nil {
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grpclog.Errorf("Failed to send delimiter chunk: %v", err)
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return
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}
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err = rc.Flush()
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if err != nil {
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if errors.Is(err, http.ErrNotSupported) {
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grpclog.Errorf("Flush not supported in %T", w)
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http.Error(w, "unexpected type of web server", http.StatusInternalServerError)
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return
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}
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grpclog.Errorf("Failed to flush response to client: %v", err)
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return
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}
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}
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}
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func handleForwardResponseServerMetadata(w http.ResponseWriter, mux *ServeMux, md ServerMetadata) {
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for k, vs := range md.HeaderMD {
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if h, ok := mux.outgoingHeaderMatcher(k); ok {
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for _, v := range vs {
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w.Header().Add(h, v)
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}
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}
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}
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}
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func handleForwardResponseTrailerHeader(w http.ResponseWriter, mux *ServeMux, md ServerMetadata) {
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for k := range md.TrailerMD {
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if h, ok := mux.outgoingTrailerMatcher(k); ok {
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w.Header().Add("Trailer", textproto.CanonicalMIMEHeaderKey(h))
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}
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}
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}
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func handleForwardResponseTrailer(w http.ResponseWriter, mux *ServeMux, md ServerMetadata) {
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for k, vs := range md.TrailerMD {
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if h, ok := mux.outgoingTrailerMatcher(k); ok {
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for _, v := range vs {
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w.Header().Add(h, v)
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}
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}
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}
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}
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// responseBody interface contains method for getting field for marshaling to the response body
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// this method is generated for response struct from the value of `response_body` in the `google.api.HttpRule`
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type responseBody interface {
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XXX_ResponseBody() interface{}
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}
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// ForwardResponseMessage forwards the message "resp" from gRPC server to REST client.
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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) {
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md, ok := ServerMetadataFromContext(ctx)
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if !ok {
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grpclog.Error("Failed to extract ServerMetadata from context")
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}
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handleForwardResponseServerMetadata(w, mux, md)
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// RFC 7230 https://tools.ietf.org/html/rfc7230#section-4.1.2
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// Unless the request includes a TE header field indicating "trailers"
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// is acceptable, as described in Section 4.3, a server SHOULD NOT
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// generate trailer fields that it believes are necessary for the user
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// agent to receive.
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doForwardTrailers := requestAcceptsTrailers(req)
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if doForwardTrailers {
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handleForwardResponseTrailerHeader(w, mux, md)
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w.Header().Set("Transfer-Encoding", "chunked")
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}
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contentType := marshaler.ContentType(resp)
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w.Header().Set("Content-Type", contentType)
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if err := handleForwardResponseOptions(ctx, w, resp, opts); err != nil {
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HTTPError(ctx, mux, marshaler, w, req, err)
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return
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}
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respRw, err := mux.forwardResponseRewriter(ctx, resp)
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if err != nil {
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grpclog.Errorf("Rewrite error: %v", err)
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HTTPError(ctx, mux, marshaler, w, req, err)
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return
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}
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var buf []byte
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if rb, ok := respRw.(responseBody); ok {
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buf, err = marshaler.Marshal(rb.XXX_ResponseBody())
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} else {
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buf, err = marshaler.Marshal(respRw)
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}
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if err != nil {
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grpclog.Errorf("Marshal error: %v", err)
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HTTPError(ctx, mux, marshaler, w, req, err)
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return
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}
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if !doForwardTrailers {
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w.Header().Set("Content-Length", strconv.Itoa(len(buf)))
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}
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if _, err = w.Write(buf); err != nil {
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grpclog.Errorf("Failed to write response: %v", err)
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}
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if doForwardTrailers {
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handleForwardResponseTrailer(w, mux, md)
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}
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}
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func requestAcceptsTrailers(req *http.Request) bool {
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te := req.Header.Get("TE")
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return strings.Contains(strings.ToLower(te), "trailers")
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}
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func handleForwardResponseOptions(ctx context.Context, w http.ResponseWriter, resp proto.Message, opts []func(context.Context, http.ResponseWriter, proto.Message) error) error {
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if len(opts) == 0 {
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return nil
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}
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for _, opt := range opts {
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if err := opt(ctx, w, resp); err != nil {
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return fmt.Errorf("error handling ForwardResponseOptions: %w", err)
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}
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}
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return nil
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}
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func handleForwardResponseStreamError(ctx context.Context, wroteHeader bool, marshaler Marshaler, w http.ResponseWriter, req *http.Request, mux *ServeMux, err error, delimiter []byte) {
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st := mux.streamErrorHandler(ctx, err)
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msg := errorChunk(st)
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if !wroteHeader {
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w.Header().Set("Content-Type", marshaler.ContentType(msg))
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w.WriteHeader(HTTPStatusFromCode(st.Code()))
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}
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buf, err := marshaler.Marshal(msg)
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if err != nil {
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grpclog.Errorf("Failed to marshal an error: %v", err)
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return
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}
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if _, err := w.Write(buf); err != nil {
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grpclog.Errorf("Failed to notify error to client: %v", err)
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return
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}
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if _, err := w.Write(delimiter); err != nil {
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grpclog.Errorf("Failed to send delimiter chunk: %v", err)
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return
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}
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}
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func errorChunk(st *status.Status) map[string]proto.Message {
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return map[string]proto.Message{"error": st.Proto()}
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}
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