Update dependencies

- uses newer version of go-ethereum required for go1.11

vendor/github.com/ethereum/go-ethereum/rpc/websocket.go

@@ -17,8 +17,10 @@
 package rpc
 
 import (
+	"bytes"
 	"context"
 	"crypto/tls"
+	"encoding/json"
 	"fmt"
 	"net"
 	"net/http"
@@ -27,11 +29,28 @@ import (
 	"strings"
 	"time"
 
+	mapset "github.com/deckarep/golang-set"
 	"github.com/ethereum/go-ethereum/log"
 	"golang.org/x/net/websocket"
-	"gopkg.in/fatih/set.v0"
 )
 
+// websocketJSONCodec is a custom JSON codec with payload size enforcement and
+// special number parsing.
+var websocketJSONCodec = websocket.Codec{
+	// Marshal is the stock JSON marshaller used by the websocket library too.
+	Marshal: func(v interface{}) ([]byte, byte, error) {
+		msg, err := json.Marshal(v)
+		return msg, websocket.TextFrame, err
+	},
+	// Unmarshal is a specialized unmarshaller to properly convert numbers.
+	Unmarshal: func(msg []byte, payloadType byte, v interface{}) error {
+		dec := json.NewDecoder(bytes.NewReader(msg))
+		dec.UseNumber()
+
+		return dec.Decode(v)
+	},
+}
+
 // WebsocketHandler returns a handler that serves JSON-RPC to WebSocket connections.
 //
 // allowedOrigins should be a comma-separated list of allowed origin URLs.
@@ -40,7 +59,16 @@ func (srv *Server) WebsocketHandler(allowedOrigins []string) http.Handler {
 	return websocket.Server{
 		Handshake: wsHandshakeValidator(allowedOrigins),
 		Handler: func(conn *websocket.Conn) {
-			srv.ServeCodec(NewJSONCodec(conn), OptionMethodInvocation|OptionSubscriptions)
+			// Create a custom encode/decode pair to enforce payload size and number encoding
+			conn.MaxPayloadBytes = maxRequestContentLength
+
+			encoder := func(v interface{}) error {
+				return websocketJSONCodec.Send(conn, v)
+			}
+			decoder := func(v interface{}) error {
+				return websocketJSONCodec.Receive(conn, v)
+			}
+			srv.ServeCodec(NewCodec(conn, encoder, decoder), OptionMethodInvocation|OptionSubscriptions)
 		},
 	}
 }
@@ -56,7 +84,7 @@ func NewWSServer(allowedOrigins []string, srv *Server) *http.Server {
 // websocket upgrade process. When a '*' is specified as an allowed origins all
 // connections are accepted.
 func wsHandshakeValidator(allowedOrigins []string) func(*websocket.Config, *http.Request) error {
-	origins := set.New()
+	origins := mapset.NewSet()
 	allowAllOrigins := false
 
 	for _, origin := range allowedOrigins {
@@ -69,18 +97,18 @@ func wsHandshakeValidator(allowedOrigins []string) func(*websocket.Config, *http
 	}
 
 	// allow localhost if no allowedOrigins are specified.
-	if len(origins.List()) == 0 {
+	if len(origins.ToSlice()) == 0 {
 		origins.Add("http://localhost")
 		if hostname, err := os.Hostname(); err == nil {
 			origins.Add("http://" + strings.ToLower(hostname))
 		}
 	}
 
-	log.Debug(fmt.Sprintf("Allowed origin(s) for WS RPC interface %v\n", origins.List()))
+	log.Debug(fmt.Sprintf("Allowed origin(s) for WS RPC interface %v\n", origins.ToSlice()))
 
 	f := func(cfg *websocket.Config, req *http.Request) error {
 		origin := strings.ToLower(req.Header.Get("Origin"))
-		if allowAllOrigins || origins.Has(origin) {
+		if allowAllOrigins || origins.Contains(origin) {
 			return nil
 		}
 		log.Warn(fmt.Sprintf("origin '%s' not allowed on WS-RPC interface\n", origin))