58 lines
1.5 KiB
Go
58 lines
1.5 KiB
Go
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package server
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import (
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"flag"
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"golang.org/x/net/context"
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"github.com/grpc-ecosystem/grpc-gateway/runtime"
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"google.golang.org/grpc"
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pb "git.loafle.net/overflow/overflow_api_service/grpc"
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"net/http"
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"strings"
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"github.com/golang/glog"
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)
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var (
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overflowEndpoint = flag.String("echo_endpoint", ":9090", "/v1/overflow/services")
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)
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func RunGwRpc() (err error) {
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ctx := context.Background()
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ctx, cancel := context.WithCancel(ctx)
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defer cancel()
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mux := runtime.NewServeMux()
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opts := []grpc.DialOption{grpc.WithInsecure()}
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err = pb.RegisterOverflowGatewayHandlerFromEndpoint(ctx, mux, *overflowEndpoint, opts)
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if err != nil {
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return err
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}
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return http.ListenAndServe(":8080", allowCORS(mux))
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}
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//https://github.com/grpc-ecosystem/grpc-gateway/blob/master/examples/main.go
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func allowCORS(h http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if origin := r.Header.Get("Origin"); origin != "" {
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w.Header().Set("Access-Control-Allow-Origin", origin)
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if r.Method == "OPTIONS" && r.Header.Get("Access-Control-Request-Method") != "" {
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preflightHandler(w, r)
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return
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}
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}
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h.ServeHTTP(w, r)
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})
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}
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func preflightHandler(w http.ResponseWriter, r *http.Request) {
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headers := []string{"Content-Type", "Accept"}
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w.Header().Set("Access-Control-Allow-Headers", strings.Join(headers, ","))
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methods := []string{"GET", "HEAD", "POST", "PUT", "DELETE"}
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w.Header().Set("Access-Control-Allow-Methods", strings.Join(methods, ","))
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glog.Infof("preflight request for %s", r.URL.Path)
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return
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}
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