add cost method for transacion, update docs

.babelrc

@@ -2,12 +2,13 @@
   "presets": [
     [ "@babel/preset-env", {
       "targets": {
-        "browsers": "> 1%"
+        "browsers": "> 1%",
+        "node": "8"
       }
     }]
   ],
   "plugins": [
     "@babel/plugin-transform-runtime",
     "@babel/plugin-proposal-class-properties"
   ]
-}
+}

cli.js

@@ -33,11 +33,13 @@ function initializeContext(context) {
 }
 
 
-function connect(autoreconnect = true) {
-  let node = process.argv.includes("--testnet") ? "wss://node.testnet.bitshares.eu" : undefined
+function connect(autoreconnect = true) {  
+  let 
+    node = process.argv.includes("--node") 
+              ? process.argv[process.argv.indexOf("--node") + 1] 
+              : (process.argv.includes("--testnet") ? "wss://node.testnet.bitshares.eu" : BitShares.node)
 
-  BitShares.init(node, false, autoreconnect)
-  return BitShares.connect().then(() => console.log(`Connected to API node: ${node}`))
+  return BitShares.connect(node, autoreconnect).then(() => console.log(`Connected to API node: ${node}`))
 }
 
 function showError(error) {

docs/README.md

@@ -144,6 +144,12 @@ tx.add(operation1)
 tx.add(operation2)
 ...
 ```
+If you want to know the cost of the transaction:
+```js
+let cost = await tx.cost()
+console.log(cost) // { BTS: 1.234 }
+```
+
 After broadcast transaction:
 ```js
 await tx.broadcast()
@@ -296,6 +302,11 @@ This command try autoconnect to mainnet BitShares. If you want to connect on tes
 $ btsdex --testnet
 >|
 ```
+or use `--node` key:
+```js
+$ btsdex --node wss://api.bts.blckchnd.com
+>|
+```
 
 It is nodejs REPL with several variables:
 - `BitShares`, main class `BitShares` package

docs/ru/README.md

@@ -144,6 +144,11 @@ tx.add(operation1)
 tx.add(operation2)
 ...
 ```
+Можно узнать стоимость транзакций:
+```js
+let cost = await tx.cost()
+console.log(cost) // { BTS: 1.234 }
+```
 После этого транзакцию можно отправлять:
 ```js
 await tx.broadcast()
@@ -296,6 +301,11 @@ $ btsdex
 $ btsdex --testnet
 >|
 ```
+или воспользуйтесь ключом `--node`:
+```js
+$ btsdex --node wss://api.bts.blckchnd.com
+>|
+```
 
 Данный режим представляет из себя простой nodejs REPL с предустановленными переменными:
 - `BitShares`, главный класс пакета `BitShares`

lib/bitshares.js

@@ -65,6 +65,8 @@ class BitShares {
     this.history = Api.new('history_api');
     this.network = Api.new('network_api');
     //this.crypto = Api.new('crypto_api');
+
+    Transaction.setDB(this.db);
     this.newTx = Transaction.newTx;
 
     this.assets = Asset.init(this.db);

lib/transaction.js

@@ -7,6 +7,10 @@ class Transaction {
     return new Proxy(tx, tx)
   }
 
+  static setDB(db) {
+    Transaction.db = db
+  }
+
   constructor(keys) {
     this.tx = new TransactionBuilder()
     this.keys = keys
@@ -34,6 +38,23 @@ class Transaction {
     )
     return this.tx.broadcast();
   }
+
+  cost = async () => {
+    await this.tx.set_required_fees();
+    let fees = {}
+    this.tx.operations.forEach(op => {
+      fees[op[1].fee.asset_id] = fees[op[1].fee.asset_id] || 0
+      fees[op[1].fee.asset_id] += +op[1].fee.amount
+    })
+
+    let assets = await Transaction.db.get_assets(Object.keys(fees))
+
+    //return assets.map(asset => ({asset, amount: fees[asset.id] / 10 ** asset.precision}))
+    return assets.reduce((obj, asset) => {
+      obj[asset.symbol] = fees[asset.id] / 10 ** asset.precision
+      return obj
+    }, {})
+  }
 }
 
 export default Transaction

package.json

@@ -1,6 +1,6 @@
 {
   "name": "btsdex",
-  "version": "0.5.1",
+  "version": "0.6.0",
   "description": "Package for work with BitShares DEX",
   "main": "index.js",
   "bin": {

test/Transaction.test.js

@@ -0,0 +1,28 @@
+const 
+  assert = require("assert"),
+  //fs = require("fs"),
+  BitShares = require("../index.js");
+
+require("dotenv").config();
+
+describe("Transaction class", () => {
+  before(async () => {
+    await BitShares.connect(process.env.BITSHARES_NODE)
+  })
+
+  describe("#cost()", () => {
+    it.only("get cost", async () => {
+      let acc = await BitShares.login(process.env.BITSHARES_ACCOUNT, process.env.BITSHARES_PASSWORD)
+      let tx = acc.newTx()
+
+      let operation = await acc.transferOperation("trade-bot", "TEST", 1)
+      tx.add(operation)
+
+      operation = await acc.transferOperation("trade-bot", "TEST", 1)
+      tx.add(operation)
+
+      let cost = await tx.cost().catch(console.log)
+      console.log(JSON.stringify(cost,null,2))
+    })
+  })
+})