From aa3cc0bc6b81fb92b0bf550ee5673bbdc0847b6a Mon Sep 17 00:00:00 2001 From: Smuu <18609909+Smuu@users.noreply.github.com> Date: Thu, 26 Oct 2023 09:33:51 +0200 Subject: [PATCH] feat: add support for handling grpc Signed-off-by: Smuu <18609909+Smuu@users.noreply.github.com> --- go.mod | 14 ++++++ go.sum | 142 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ main.go | 97 +++++++++++++++++++++++++++++++++++++- 3 files changed, 252 insertions(+), 1 deletion(-) create mode 100644 go.sum diff --git a/go.mod b/go.mod index 9999438..2b86e39 100644 --- a/go.mod +++ b/go.mod @@ -1,3 +1,17 @@ module github.com/celestiaorg/autoscale-proxy go 1.21.1 + +require ( + github.com/mwitkow/grpc-proxy v0.0.0-20230212185441-f345521cb9c9 + google.golang.org/grpc v1.59.0 +) + +require ( + github.com/golang/protobuf v1.5.3 // indirect + golang.org/x/net v0.14.0 // indirect + golang.org/x/sys v0.11.0 // indirect + golang.org/x/text v0.12.0 // indirect + google.golang.org/genproto/googleapis/rpc v0.0.0-20230822172742-b8732ec3820d // indirect + google.golang.org/protobuf v1.31.0 // indirect +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..4dd4581 --- /dev/null +++ b/go.sum @@ -0,0 +1,142 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= +github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= +github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk= +github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= +github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4= +github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk= +github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c= +github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q= +github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A= +github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= +github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U= +github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8= +github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA= +github.com/golang/protobuf 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h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= +gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.1.3/go.mod h1:NgwopIslSNH47DimFoV78dnkksY2EFtX0ajyb3K/las= diff --git a/main.go b/main.go index 632183b..1e7238b 100644 --- a/main.go +++ b/main.go @@ -2,11 +2,18 @@ package main import ( "bytes" + "context" + "fmt" + "google.golang.org/grpc/codes" + "google.golang.org/grpc/metadata" + "google.golang.org/grpc/status" "io" "log" "net/http" "os" "strings" + + "google.golang.org/grpc" ) var ( @@ -56,7 +63,49 @@ func proxyRequest(fullSubdomain, path string, buffer *bytes.Buffer, r *http.Requ return resp.StatusCode, headers, nil } -func handleRequest(w http.ResponseWriter, r *http.Request) { +func proxyGrpcRequest(ctx context.Context, fullSubdomain, method string, r *http.Request) (codes.Code, map[string]string, []byte, error) { + target := "https://" + fullSubdomain + ".lunaroasis.net" + method + conn, err := grpc.Dial(target, grpc.WithInsecure()) + if err != nil { + return 0, nil, nil, err + } + defer conn.Close() + + stream, err := conn.NewStream(ctx, &grpc.StreamDesc{ServerStreams: true}, method) + if err != nil { + return 0, nil, nil, err + } + + // Assume r.Body is a io.Reader containing the serialized request message + if err := stream.SendMsg(r.Body); err != nil { + return 0, nil, nil, err + } + + // Create a buffer to hold the serialized response message + buffer := new(bytes.Buffer) + if err := stream.RecvMsg(buffer); err != nil { + return 0, nil, nil, err + } + + headers, _ := metadata.FromIncomingContext(ctx) + headerMap := make(map[string]string) + for key, values := range headers { + for _, value := range values { + headerMap[key] = value + } + } + + if err := stream.RecvMsg(buffer); err != nil { + st, ok := status.FromError(err) + if ok { + return st.Code(), nil, buffer.Bytes(), err + } + return codes.Unknown, nil, nil, err + } + return codes.Unknown, nil, nil, fmt.Errorf("unexpected error") +} + +func handleHttpRequest(w http.ResponseWriter, r *http.Request) { infoLog.Printf("Received request from %s", r.Host) hostParts := strings.Split(r.Host, ".") if len(hostParts) < 3 { @@ -97,6 +146,52 @@ func handleRequest(w http.ResponseWriter, r *http.Request) { io.Copy(w, buffer) } +func handleGrpcRequest(w http.ResponseWriter, r *http.Request) { + infoLog.Printf("Received gRPC request from %s", r.Host) + hostParts := strings.Split(r.Host, ".") + if len(hostParts) < 3 { + errorLog.Printf("Invalid domain: %s", r.Host) + http.Error(w, "Invalid domain", http.StatusBadRequest) + return + } + + // This line signifies the start of the HTTP response with a status code of 200 OK. + // The actual gRPC status will be conveyed in the trailers. + w.WriteHeader(http.StatusOK) + + subdomain := hostParts[0] // Extract original domain + //originalDomain := strings.Join(hostParts[1:], ".") + + statusCode, headers, responseBody, err := proxyGrpcRequest(r.Context(), subdomain+".statescale", r.RequestURI, r) + debugLog.Printf("Received status code %d", statusCode) + if err != nil || statusCode != codes.OK { + debugLog.Printf("Proxying request to %s", subdomain+".snapscale") + backupStatusCode, backupHeaders, backupResponseBody, _ := proxyGrpcRequest(r.Context(), subdomain+".snapscale", r.RequestURI, r) + debugLog.Printf("Received status code %d", backupStatusCode) + + for key, value := range backupHeaders { + w.Header().Set(key, value) + } + w.Write(backupResponseBody) // Write the response body directly + return + } + + for key, value := range headers { + w.Header().Set(key, value) + } + + // Assume response body is in buffer + w.Write(responseBody) // Write the response body directly +} + +func handleRequest(w http.ResponseWriter, r *http.Request) { + if r.Header.Get("Content-Type") == "application/grpc" { + handleGrpcRequest(w, r) + } else { + handleHttpRequest(w, r) + } +} + func main() { infoLog.Println("Starting server on :8080") http.HandleFunc("/", handleRequest)