package rpc import ( "net" "github.com/ethereum/go-ethereum/rpc" log "github.com/sirupsen/logrus" "github.com/vulcanize/ipld-eth-server/pkg/prom" ) // StartWSEndpoint starts a websocket endpoint. func StartWSEndpoint(endpoint string, apis []rpc.API, modules []string, wsOrigins []string, exposeAll bool) (net.Listener, *rpc.Server, error) { if bad, available := checkModuleAvailability(modules, apis); len(bad) > 0 { log.Error("Unavailable modules in WS API list", "unavailable", bad, "available", available) } // Generate the whitelist based on the allowed modules whitelist := make(map[string]bool) for _, module := range modules { whitelist[module] = true } // Register all the APIs exposed by the services handler := rpc.NewServer() for _, api := range apis { if exposeAll || whitelist[api.Namespace] || (len(whitelist) == 0 && api.Public) { if err := handler.RegisterName(api.Namespace, api.Service); err != nil { return nil, nil, err } log.Debug("WebSocket registered", "service", api.Service, "namespace", api.Namespace) } } // All APIs registered, start the HTTP listener var ( listener net.Listener err error ) if listener, err = net.Listen("tcp", endpoint); err != nil { return nil, nil, err } wsServer := rpc.NewWSServer(wsOrigins, handler) wsServer.Handler = prom.WSMiddleware(wsServer.Handler) go wsServer.Serve(listener) return listener, handler, err }