feat: call action before starting the blockchain node

dapps/templates/demo/config/contracts.js

@@ -3,6 +3,7 @@ module.exports = {
   default: {
     // order of connections the dapp should connect to
     dappConnection: [
+      "$EMBARK",
       "$WEB3",  // uses pre existing web3 object if available (e.g in Mist)
       "ws://localhost:8546",
       "http://localhost:8545"

packages/embark/src/lib/modules/blockchain/index.js

@@ -6,7 +6,7 @@ const Web3RequestManager = require('web3-core-requestmanager');
 import BlockchainAPI from "./api";
 class Blockchain {
 
-  constructor(embark) {
+  constructor(embark, options) {
     this.embarkConfig = embark.config.embarkConfig;
     this.logger = embark.logger;
     this.events = embark.events;
@@ -14,6 +14,7 @@ class Blockchain {
     this.contractConfig = embark.config.contractConfig;
     this.blockchainApi = new BlockchainAPI(embark);
     this.startedClient = null;
+    this.plugins = options.plugins;
 
     embark.registerActionForEvent("pipeline:generateAll:before", this.addArtifactFile.bind(this));
 
@@ -22,7 +23,12 @@ class Blockchain {
       this.blockchainNodes[clientName] = startCb;
     });
 
-    this.events.setCommandHandler("blockchain:node:start", async (blockchainConfig, cb) => {
+    this.events.setCommandHandler("blockchain:node:start", async (initialBlockchainConfig, cb) => {
+      this.plugins.emitAndRunActionsForEvent("blockchain:config:modify", initialBlockchainConfig, (err, blockchainConfig) => {
+        if (err) {
+          this.logger.error(__('Error getting modified blockchain config: %s', err.message || err));
+          blockchainConfig = initialBlockchainConfig;
+        }
         const self = this;
         const clientName = blockchainConfig.client;
         function started() {
@@ -63,6 +69,8 @@ class Blockchain {
 
           this.startedClient = clientName;
           clientFunctions.launchFn.apply(clientFunctions, [onStart]);
+
+        });
       });
     });
 

packages/embark/src/lib/modules/ethereum-blockchain-client/index.js

@@ -60,7 +60,8 @@ class EthereumBlockchainClient {
     const web3 = await this.web3;
     const [account] = await web3.eth.getAccounts();
     const contractObj = new web3.eth.Contract(contract.abiDefinition, contract.address);
-    const contractObject = contractObj.deploy({arguments: (contract.args || []), data: ("0x" + contract.code)});
+    const code = contract.code.substring(0, 2) === '0x' ? contract.code : "0x" + contract.code;
+    const contractObject = contractObj.deploy({arguments: (contract.args || []), data: code});
 
     if (contract.gas === 'auto' || !contract.gas) {
       const gasValue = await contractObject.estimateGas();

packages/embark/src/lib/modules/geth/blockchain.js

@@ -59,7 +59,8 @@ var Blockchain = function(userConfig, clientClass, communicationConfig) {
     vmdebug: this.userConfig.vmdebug || false,
     targetGasLimit: this.userConfig.targetGasLimit || false,
     syncMode: this.userConfig.syncMode || this.userConfig.syncmode,
-    verbosity: this.userConfig.verbosity
+    verbosity: this.userConfig.verbosity,
+    customOptions: this.userConfig.customOptions
   };
 
   this.devFunds = null;

packages/embark/src/lib/modules/geth/gethClient.js

@@ -381,6 +381,16 @@ class GethClient {
           return callback(null, '--dev');
         }
         callback(null, '');
+      },
+      function customOptions(callback) {
+        if (config.customOptions) {
+          if (Array.isArray(config.customOptions)) {
+            config.customOptions = config.customOptions.join(' ');
+          }
+          args.push(config.customOptions);
+          return callback(null, config.customOptions);
+        }
+        callback(null, '');
       }
     ], function(err) {
       if (err) {

packages/embark/src/lib/modules/parity/blockchain.js

@@ -61,7 +61,8 @@ var Blockchain = function (userConfig, clientClass) {
     targetGasLimit: this.userConfig.targetGasLimit || false,
     syncMode: this.userConfig.syncMode || this.userConfig.syncmode,
     verbosity: this.userConfig.verbosity,
-    proxy: this.userConfig.proxy
+    proxy: this.userConfig.proxy,
+    customOptions: this.userConfig.customOptions
   };
 
   this.devFunds = null;

packages/embark/src/lib/modules/parity/parityClient.js

@@ -394,6 +394,16 @@ class ParityClient {
         // Default Parity gas limit is 4700000: let's set to the geth default
         args.push("--gas-floor-target=" + DEFAULTS.TARGET_GAS_LIMIT);
         return callback(null, "--gas-floor-target=" + DEFAULTS.TARGET_GAS_LIMIT);
+      },
+      function customOptions(callback) {
+        if (config.customOptions) {
+          if (Array.isArray(config.customOptions)) {
+            config.customOptions = config.customOptions.join(' ');
+          }
+          args.push(config.customOptions);
+          return callback(null, config.customOptions);
+        }
+        callback(null, '');
       }
     ], function (err) {
       if (err) {

packages/plugins/web3/src/index.js

@@ -44,7 +44,9 @@ class EmbarkWeb3 {
     const web3 = new Web3(provider);
     await this.events.request2("runcode:register", 'web3', web3);
     const accounts = await web3.eth.getAccounts();
+    if (accounts.length) {
       await this.events.request2('runcode:eval', `web3.eth.defaultAccount = '${accounts[0]}'`);
+    }
 
     await this.events.request2('console:register:helpCmd', {
       cmdName: "web3",

packages/stack/proxy/src/proxy.js

@@ -75,7 +75,7 @@ export class Proxy {
           // Send the possibly modified request to the Node
           requestManager.send(resp.reqData, (err, result) => {
             if (err) {
-              res.status(500).send(err.message || err);
+              return res.status(500).send(err.message || err);
             }
             this.emitActionsForResponse(resp.reqData, {jsonrpc: "2.0", id: resp.reqData.id, result}, (_err, resp) => {
               // Send back to the caller (web3)