Added helper script for pool algo switch emulation

mt.js

@@ -0,0 +1,107 @@
+#!/usr/bin/env node
+
+// Miner Tester: testing miner algo switch stability
+
+"use strict";
+
+// *****************************************************************************
+// *** DEPENDECIES                                                           ***
+// *****************************************************************************
+
+const net = require('net');
+
+// *****************************************************************************
+// *** CONSTS                                                                ***
+// *****************************************************************************
+
+const algos = [ "cn/1", "cn/xtl", "cn/msr", "cn/xao", "cn/rto", "cn-heavy/0", "cn-heavy/tube", "cn-heavy/xhv", "cn-lite/1" ];
+
+// *****************************************************************************
+// *** WORKING STATE                                                         ***
+// *****************************************************************************
+
+let curr_miner_socket = null;
+
+// *****************************************************************************
+// *** FUNCTIONS                                                             ***
+// *****************************************************************************
+
+// *** Console/log output
+
+function log(msg) {
+  console.log(">>> " + msg);
+}
+
+function err(msg) {
+  console.error("!!! " + msg);
+}
+
+// *** Miner socket processing
+
+const test_blob_str = "7f7ffeeaa0db054f15eca39c843cb82c15e5c5a7743e06536cb541d4e96e90ffd31120b7703aa90000000076a6f6e34a9977c982629d8fe6c8b45024cafca109eef92198784891e0df41bc03";
+
+let miner_server = net.createServer(function (miner_socket) {
+  if (curr_miner_socket) {
+    err("Miner server on localhost:3333 port is already connected (please make sure you do not have other miner running)");
+    return;
+  }
+  log("Miner server on localhost:3333 port connected from " + miner_socket.remoteAddress);
+
+  let miner_data_buff = "";
+
+  miner_socket.on('data', function (msg) {
+    miner_data_buff += msg;
+    if (miner_data_buff.indexOf('\n') === -1) return;
+    let messages = miner_data_buff.split('\n');
+    let incomplete_line = miner_data_buff.slice(-1) === '\n' ? '' : messages.pop();
+    for (let i = 0; i < messages.length; i++) {
+      let message = messages[i];
+      if (message.trim() === '') continue;
+      let json;
+      try {
+        json = JSON.parse(message);
+      } catch (e) {
+        err("Can't parse message from the miner: " + message);
+        continue;
+      }
+      const is_keepalived = "method" in json && json.method === "keepalived";
+      if ("method" in json && json.method === "login") {
+        miner_socket.write(
+          '{"id":1,"jsonrpc":"2.0","error":null,"result":{"id":"benchmark","job":{"blob":"' + test_blob_str +
+          '","algo":"cn/1","job_id":"benchmark1","target":"10000000","id":"benchmark"},"status":"OK"}}\n'
+        );
+        curr_miner_socket = miner_socket;
+      }
+    }
+    miner_data_buff = incomplete_line;
+  });
+  miner_socket.on('end', function() {
+    log("Miner socket was closed");
+    curr_miner_socket = null;
+  });
+  miner_socket.on('error', function() {
+    err("Miner socket error");
+    miner_socket.destroy();
+    curr_miner_socket = null;
+  });
+});
+
+let job_num = 1;
+function change_algo() {
+  if (curr_miner_socket) {
+    const algo = algos[Math.floor(Math.random() * algos.length)];
+    log("Switching to " + algo);
+    curr_miner_socket.write(
+      '{"jsonrpc":"2.0","method":"job","params":{"blob":"' + test_blob_str + '","algo":"' + algo +
+      '","job_id":"benchmark' + ++job_num + '","target":"10000000","id":"benchmark"}}\n'
+    );
+  }
+  const sleep = Math.floor(Math.random() * 5);
+  log("Waiting " + sleep + "s");
+  setTimeout(change_algo, sleep * 1000);
+}
+
+miner_server.listen(3333, "localhost", function() {
+  log("Local miner server on localhost:3333 port started");
+  change_algo();
+});