Update ethers.js to latest version v4

The main change is how ethers loads the networkId which is now async.
Thus the init process had to change a bit

lib/contracts/base.js

@@ -17,11 +17,7 @@ class Base {
   }
 
   on(type, callback) {
-    let eventMethod = `on${type.toLowerCase()}`;
+    return this.contract.on(type, callback);
-    // Don't use this.contract.events here. Seems to be a bug in ethers.js
-    this.contract[eventMethod] = callback;
-
-    return this;
   }
 }
 module.exports = Base;

lib/contracts/kernel.js

@@ -12,7 +12,9 @@ class Kernel extends Base {
   }
 
   appNamehash(appName) {
-    return AppIds[this.contract.provider.chainId.toString()][appName];
+    // actually provider.network is an asynchronous property.
+    // but when we call this function kredits is already initialized and the network is already loaded
+    return AppIds[this.contract.provider.network.chainId.toString()][appName];
   }
 }
 

lib/kredits.js

@@ -36,9 +36,7 @@ class Kredits {
 
     this.provider = provider;
     this.signer = signer;
-    // by default we only need the DAO/Kernel address.
+    this.addresses = addresses || {};
-    // the rest is loaded from there in the init() function
-    this.addresses = addresses || { Kernel: DaoAddresses[this.provider.chainId.toString()] }; // chainID must be a string
     this.abis = abis || ABIS;
     this.ipfs = new IPFS(ipfsConfig);
     this.contracts = {};
@@ -46,6 +44,8 @@ class Kredits {
 
   init(names) {
     let contractsToLoad = names || APP_CONTRACTS;
+    return this.provider.getNetwork().then(network => {
+      this.addresses['Kernel'] = this.addresses['Kernel'] || DaoAddresses[network.chainId.toString()];
       let addressPromises = contractsToLoad.map((contractName) => {
         return this.Kernel.getApp(contractName).then((address) => {
           this.addresses[contractName] = address;
@@ -57,6 +57,7 @@ class Kredits {
         });
       });
       return RSVP.all(addressPromises).then(() => { return this });
+    });
   }
 
   static setup(provider, signer, ipfsConfig = null) {
@@ -82,7 +83,7 @@ class Kredits {
   }
 
   get Operator() {
-    return this.Proposal();
+    return this.Proposal;
   }
 
   get Token() {

package.json

@@ -42,7 +42,7 @@
   },
   "dependencies": {
     "eth-ens-namehash": "^2.0.8",
-    "ethers": "3.0.15",
+    "ethers": "^4.0.27",
     "ipfs-api": "^19.0.0",
     "rsvp": "^4.8.2"
   },

scripts/helpers/init_kredits.js

@@ -4,22 +4,22 @@ const Kredits = require('../../lib/kredits');
 
 module.exports = async function(web3) {
   return new Promise((resolve, reject) => {
-    getNetworkId(web3).then(networkId => {
+    const provider = new ethers.providers.Web3Provider(web3.currentProvider);
-      const provider = new ethers.providers.Web3Provider(
-        web3.currentProvider, { chainId: parseInt(networkId) }
-      );
     let signer = provider.getSigner();
     // checking if siner supports signing transactions
     signer.getAddress().then(_ => {
       new Kredits(provider, signer).init().then(kredits => {
         resolve(kredits);
-        })
+      }).catch(e => {
+        reject(e);
+      });
     }).catch(e => {
       console.log(`Signer account not available; readonly connection (${e.message}`);
       new Kredits(provider, null).init().then(kredits => {
         resolve(kredits);
-        })
+      }).catch(e => {
-      })
+        reject(e);
+      });
     })
   });
 }