fix(@embark/ganache): fix connection to other nodes from Ganache

Using tests with a custom --node didn't work, because Ganache always
used it's own provider. Now, it actually checks before if there is
not another node started before using its own provider (+1 squashed commits)

Author: jrainville

packages/plugins/ganache/package.json

@@ -48,6 +48,7 @@
     "core-js": "3.4.3",
     "embark-core": "^5.2.0-nightly.4",
     "embark-i18n": "^5.1.1",
+    "embark-utils": "^5.2.0-nightly.3",
     "ganache-cli": "6.8.2"
   },
   "devDependencies": {

packages/plugins/ganache/src/index.js

@@ -1,4 +1,5 @@
 import {__} from 'embark-i18n';
+const {testRpcWithEndpoint, testWsEndpoint} = require('embark-utils');
 const constants = require('embark-core/constants');
 
 class Ganache {
@@ -8,7 +9,12 @@ class Ganache {
 
     this.embark.events.request("blockchain:node:register", constants.blockchain.clients.ganache, {
       isStartedFn: (cb) => {
-        cb(null, !!this.currentProvider); // Always assume it's started, because it's just a provider (nothing to start)
+        if (this.currentProvider) {
+          return cb(null, true);
+        }
+        this._doCheck((err, started) => {
+          cb(err,started);
+        });
       },
       launchFn: (cb) => {
         this._getProvider(); // No need to return anything, we just want to populate currentProvider
@@ -19,8 +25,18 @@ class Ganache {
         this.currentProvider = null;
         cb();
       },
-      provider: async (_endpoint) => {
-        return this._getProvider();
+      provider: (_endpoint) => {
+        if (this.currentProvider) {
+          return this.currentProvider;
+        }
+        return new Promise(resolve => {
+          this._doCheck(async (_err, started) => {
+            if (_err || !started) {
+              return resolve(this._getProvider());
+            }
+            resolve(await this.embark.events.request2('blockchain:node:provider:template'));
+          });
+        });
       }
     });
 
@@ -77,6 +93,17 @@ class Ganache {
         });
     });
   }
+
+  _doCheck(cb) {
+    const endpoint = this.embark.config.blockchainConfig.endpoint;
+    if (!endpoint) {
+      return cb(null, false);
+    }
+    if (endpoint.startsWith('ws')) {
+      return testWsEndpoint(endpoint, (err) => cb(null, !err));
+    }
+    testRpcWithEndpoint(endpoint, (err) => cb(null, !err));
+  }
 }
 
 module.exports = Ganache;

packages/stack/blockchain/src/index.js

@@ -45,13 +45,7 @@ export default class Blockchain {
       if (!provider) {
         // Set default provider function
         clientFunctions.provider = async () => {
-          if (this.blockchainConfig.endpoint.startsWith('ws')) {
-            return new Web3.providers.WebsocketProvider(this.blockchainConfig.endpoint, {
-              headers: { Origin: constants.embarkResourceOrigin }
-            });
-          }
-          const web3 = new Web3(this.blockchainConfig.endpoint);
-          return web3.currentProvider;
+          return this.getProviderFromTemplate(this.blockchainConfig.endpoint);
         };
       }
 
@@ -137,6 +131,10 @@ export default class Blockchain {
       }
     });
 
+    this.events.setCommandHandler('blockchain:node:provider:template', (cb) => {
+      cb(null, this.getProviderFromTemplate(this.blockchainConfig.endpoint));
+    });
+
     this.events.setCommandHandler("blockchain:client:register", (clientName, getProviderFunction) => {
       this.blockchainClients[clientName] = getProviderFunction;
     });
@@ -164,6 +162,16 @@ export default class Blockchain {
     }
   }
 
+  getProviderFromTemplate(endpoint) {
+    if (endpoint.startsWith('ws')) {
+      return new Web3.providers.WebsocketProvider(endpoint, {
+        headers: { Origin: constants.embarkResourceOrigin }
+      });
+    }
+    const web3 = new Web3(endpoint);
+    return web3.currentProvider;
+  }
+
   addArtifactFile(_params, cb) {
     if (!this.blockchainConfig.enabled) {
       cb();