ping endpoint before connecting to see if available

Author: jrainville

lib/tests/test.js

@@ -7,6 +7,7 @@ const Events = require('../core/events');
 const cloneDeep = require('clone-deep');
 const AccountParser = require('../contracts/accountParser');
 const Provider = require('../contracts/provider');
+const utils = require('../utils/utils');
 
 const EmbarkJS = require('../../js/embark_node');
 
@@ -44,18 +45,29 @@ class Test {
 
   initWeb3Provider(callback) {
     if (this.simOptions.host) {
-      const protocol = (this.simOptions.type === "rpc") ? 'http' : 'ws';
+      let {host, port, type, protocol, accounts}  = this.simOptions;
+      if (!protocol) {
+        protocol = (this.simOptions.type === "rpc") ? 'http' : 'ws';
+      }
+      const endpoint = `${protocol}://${host}:${port}`;
       const providerOptions = {
         web3: this.web3,
-        type: this.simOptions.type,
-        accountsConfig: this.simOptions.accounts,
+        type,
+        accountsConfig: accounts,
         blockchainConfig: this.engine.config.blockchainConfig,
         logger: this.engine.logger,
         isDev: false,
-        web3Endpoint: `${protocol}://${this.simOptions.host}:${this.simOptions.port}`
+        web3Endpoint: endpoint
       };
-      this.provider = new Provider(providerOptions);
-      return this.provider.startWeb3Provider(callback);
+      console.info(`Connecting to node at ${endpoint}`.cyan);
+      return utils.pingEndpoint(host, port, type, protocol, this.engine.config.blockchainConfig.wsOrigins.split(',')[0], (err) => {
+        if (err) {
+          console.error(`Error connecting to the node, there might be an error in ${endpoint}`.red);
+          return callback(err);
+        }
+        this.provider = new Provider(providerOptions);
+        return this.provider.startWeb3Provider(callback);
+      });
     }
 
     if (this.simOptions.accounts) {
@@ -214,7 +226,12 @@ class Test {
           next(null, accounts);
         });
       }
-    ], callback);
+    ], (err, accounts) => {
+      if (err) {
+        process.exit(1);
+      }
+      callback(null, accounts);
+    });
   }
 
   _deploy(config, callback) {

lib/utils/utils.js

@@ -73,8 +73,7 @@ function httpsGetJson(url, callback) {
   });
 }
 
-function pingEndpoint(host, port, type, protocol, wsOrigins, callback) {
-  const origin = wsOrigins.split(',')[0];
+function pingEndpoint(host, port, type, protocol, origin, callback) {
   const options = {
     protocolVersion: 13,
     perMessageDeflate: true,
@@ -93,10 +92,10 @@ function pingEndpoint(host, port, type, protocol, wsOrigins, callback) {
   }
   let req;
   // remove trailing api key from infura, ie rinkeby.infura.io/nmY8WtT4QfEwz2S7wTbl
-  if(options.host.indexOf('/') > -1){
+  if (options.host.indexOf('/') > -1){
     options.host = options.host.split('/')[0];
   }
-  if(protocol === 'https') {
+  if (protocol === 'https') {
     req = require('https').get(options);
   } else {
     req = require('http').get(options);