RPC patch with Fast format (#279)

* fast format

* parseInt16

* rpc patch entrypoint

* remove fastFormatter.js; pump version

---------

Co-authored-by: Kang <kangjianhu@conflux-chain.org>

package.json

@@ -1,7 +1,7 @@
 {
   "name": "js-conflux-sdk",
   "description": "JavaScript Conflux Software Development Kit",
-  "version": "2.4.11",
+  "version": "2.4.12",
   "license": "LGPL-3.0",
   "author": "pan.wang@confluxnetwork.org",
   "repository": "https://github.com/Conflux-Chain/js-conflux-sdk.git",

src/rpc/index.js

@@ -1,4 +1,5 @@
 const format = require('../util/format');
+const { rpcPatch } = require('./rpcPatch');
 
 class RPCMethodFactory {
   constructor(conflux, methods = []) {
@@ -8,6 +9,7 @@ class RPCMethodFactory {
 
   addMethods(methods) {
     for (const methodMeta of methods) {
+      rpcPatch(methodMeta);
       const method = methodMeta.method.split('_')[1];
       this[method] = this.createRPCMethod(methodMeta);
       // create method alias

src/rpc/rpcPatch.js

@@ -0,0 +1,19 @@
+/**
+ * Give a chance to change the RPC behavior.
+ * For example, you may want to use a different responseFormatter for traceBlock.
+ * @param rpcDef
+ */
+
+// eslint-disable-next-line no-unused-vars
+function emptyPatchRPCMethod(rpcDef) {
+  // const { method, requestFormatters, responseFormatter } = rpcDef;
+}
+
+let rpcPatch = emptyPatchRPCMethod;
+
+// set it before initializing a new Conflux instance.
+function setPRCMethodPatch(fn) {
+  rpcPatch = fn;
+}
+
+module.exports = { rpcPatch, setPRCMethodPatch };