112 lines
2.1 KiB
Go
112 lines
2.1 KiB
Go
package jsonrpc
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import (
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"context"
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"encoding/json"
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"io"
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"net/http"
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"strings"
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"github.com/gorilla/websocket"
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)
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const (
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rpcParseError = -32700
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rpcMethodNotFound = -32601
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rpcInvalidParams = -32602
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)
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// RPCServer provides a jsonrpc 2.0 http server handler
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type RPCServer struct {
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methods handlers
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}
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// NewServer creates new RPCServer instance
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func NewServer() *RPCServer {
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return &RPCServer{
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methods: map[string]rpcHandler{},
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}
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}
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var upgrader = websocket.Upgrader{
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CheckOrigin: func(r *http.Request) bool {
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return true
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},
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}
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func (s *RPCServer) handleWS(ctx context.Context, w http.ResponseWriter, r *http.Request) {
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// TODO: allow setting
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// (note that we still are mostly covered by jwt tokens)
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w.Header().Set("Access-Control-Allow-Origin", "*")
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if r.Header.Get("Sec-WebSocket-Protocol") != "" {
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w.Header().Set("Sec-WebSocket-Protocol", r.Header.Get("Sec-WebSocket-Protocol"))
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}
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c, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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log.Error(err)
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w.WriteHeader(500)
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return
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}
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(&wsConn{
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conn: c,
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handler: s.methods,
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}).handleWsConn(ctx)
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if err := c.Close(); err != nil {
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log.Error(err)
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return
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}
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}
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// TODO: return errors to clients per spec
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func (s *RPCServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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ctx := r.Context()
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if strings.Contains(r.Header.Get("Connection"), "Upgrade") {
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s.handleWS(ctx, w, r)
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return
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}
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s.methods.handleReader(ctx, r.Body, w, rpcError)
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}
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func rpcError(wf func(func(io.Writer)), req *request, code int, err error) {
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wf(func(w io.Writer) {
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if hw, ok := w.(http.ResponseWriter); ok {
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hw.WriteHeader(500)
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}
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log.Warnf("rpc error: %s", err)
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if req.ID == nil { // notification
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return
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}
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resp := response{
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Jsonrpc: "2.0",
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ID: *req.ID,
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Error: &respError{
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Code: code,
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Message: err.Error(),
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},
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}
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err = json.NewEncoder(w).Encode(resp)
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if err != nil {
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log.Warnf("failed to write rpc error: %s", err)
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return
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}
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})
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}
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// Register registers new RPC handler
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//
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// Handler is any value with methods defined
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func (s *RPCServer) Register(namespace string, handler interface{}) {
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s.methods.register(namespace, handler)
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}
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var _ error = &respError{}
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