chore(@embark/stack/blockchain-client): re-add missing file (#1973)

packages/stack/blockchain-client/src/index.js

@@ -0,0 +1,41 @@
+const Web3 = require('web3');
+
+class BlockchainClient {
+
+  constructor(embark, _options) {
+    this.embark = embark;
+    this.events = embark.events;
+
+    this.blockchainClients = {};
+    this.client = null;
+    this.events.setCommandHandler("blockchain:client:register", (clientName, blockchainClient) => {
+      this.blockchainClients[clientName] = blockchainClient;
+      this.client = blockchainClient;
+    });
+
+    // TODO: unclear currently if this belongs here so it's a bit hardcoded for now
+    this.events.setCommandHandler("blockchain:client:provider", (clientName, cb) => {
+      this.events.request("proxy:endpoint:get", (err, endpoint) => {
+        if (err) {
+          return cb(err);
+        }
+        const web3 = new Web3(endpoint);
+        cb(null, web3.currentProvider);
+      });
+    });
+
+    // TODO: maybe not the ideal event to listen to?
+    // for e.g, could wait for all stack components to be ready
+    // TODO: probably better to have 2 stages in engine, services start, then connections, etc..
+    this.events.on("blockchain:started", (_clientName) => {
+      // make connections
+      // this.client.initAndConnect(); // and config options
+      // should do stuff like
+      // connect to endpoint given
+      // set default account
+    });
+  }
+
+}
+
+module.exports = BlockchainClient;