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http_server.go
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http_server.go
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package rpc
import (
"net/http"
"github.com/improbable-eng/grpc-web/go/grpcweb"
"google.golang.org/grpc"
)
type HTTPHeader struct {
Key string
Value string
}
var defaultHTTPHeaders = []HTTPHeader{
{
Key: "Access-Control-Allow-Origin",
Value: "*",
},
{
Key: "Access-Control-Allow-Methods",
Value: "POST, GET, OPTIONS, PUT, DELETE",
},
{
Key: "Access-Control-Allow-Headers",
Value: "*",
},
}
// NewHTTPServer creates and intializes a new HTTP GRPC proxy server
func NewHTTPServer(
grpcServer *grpc.Server,
address string,
) *http.Server {
wrappedServer := grpcweb.WrapServer(
grpcServer,
grpcweb.WithOriginFunc(func(origin string) bool { return true }),
)
mux := http.NewServeMux()
// register gRPC HTTP proxy
mux.Handle("/", wrappedHandler(wrappedServer, defaultHTTPHeaders))
httpServer := &http.Server{
Addr: address,
Handler: mux,
}
return httpServer
}
func wrappedHandler(wrappedServer *grpcweb.WrappedGrpcServer, headers []HTTPHeader) http.HandlerFunc {
return func(res http.ResponseWriter, req *http.Request) {
setResponseHeaders(res, headers)
if req.Method == "OPTIONS" {
return
}
wrappedServer.ServeHTTP(res, req)
}
}
func setResponseHeaders(w http.ResponseWriter, headers []HTTPHeader) {
for _, header := range headers {
w.Header().Set(header.Key, header.Value)
}
}