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fix: remove erc20 metadata stubbing #885

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Merged
owen-eth merged 1 commit into from
Feb 9, 2026
Merged

fix: remove erc20 metadata stubbing #885

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40 changes: 0 additions & 40 deletions tools/preconf-rpc/rpcserver/rpcserver.go
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Original file line number Diff line number Diff line change
Expand Up @@ -182,12 +182,6 @@ func (s *JSONRPCServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
start := time.Now()

if cacheMethods[req.Method] {
if stubbed, resp := maybeStubERC20Meta(req.Method, req.Params); stubbed {
s.writeResponse(w, req.ID, &resp)
s.metrics.methodSuccessCounts.WithLabelValues(req.Method).Inc()
s.metrics.methodSuccessDurations.WithLabelValues(req.Method).Observe(float64(time.Since(start).Milliseconds()))
return
}
key := cacheKey(req.Method, req.Params)
if entry, ok := s.cache.Get(key); ok && time.Now().Before(entry.until) {
s.logger.Debug("Cache hit", "method", req.Method, "id", req.ID)
Expand Down Expand Up @@ -340,40 +334,6 @@ func setCorsHeaders(w http.ResponseWriter) {
w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
}

// short-circuit a few very common ERC-20 metadata calls
// selectors: symbol 0x95d89b41, decimals 0x313ce567, name 0x06fdde03
func maybeStubERC20Meta(method string, params []any) (stubbed bool, resp json.RawMessage) {
if method != "eth_call" || len(params) == 0 {
return false, nil
}
// parse minimal: [{"to":"0x..","data":"0x...."}, <blockTag?>]
callObj, ok := params[0].(map[string]any)
if !ok {
return false, nil
}
data, _ := callObj["data"].(string)
switch strings.ToLower(data) {
case "0x95d89b41": // symbol()
// return ABI-encoded string "TOKEN"
enc := "0x" +
"0000000000000000000000000000000000000000000000000000000000000020" + // offset
"0000000000000000000000000000000000000000000000000000000000000005" + // len
"544f4b454e000000000000000000000000000000000000000000000000000000" // "TOKEN"
return true, json.RawMessage(`"` + enc + `"`)
case "0x313ce567": // decimals()
enc := "0x" + "0000000000000000000000000000000000000000000000000000000000000012" // 18
return true, json.RawMessage(`"` + enc + `"`)
case "0x06fdde03": // name()
enc := "0x" +
"0000000000000000000000000000000000000000000000000000000000000020" +
"0000000000000000000000000000000000000000000000000000000000000005" +
"546f6b656e000000000000000000000000000000000000000000000000000000"
return true, json.RawMessage(`"` + enc + `"`)
default:
return false, nil
}
}

func pickTTL(method string, params json.RawMessage) time.Duration {
switch method {
case "net_version":
Expand Down
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