modify node sample for cth selftx

Author: makevoid

eth-keychain-example-node.js

@@ -1,15 +1,28 @@
+// force example on cTH network
+
+process.env.CTH = "1"
+
 const { Keychain } = require('./ethereum-keychain')
 
 const { readFileSync } = require('fs')
 const pvtKey = readFileSync('./.private-key.txt').toString().trim()
+
+if (!pvtKey) {
+  console.error("private key is empty - generate, backup and load a private key first")
+  process.exit(1)
+}
+
 wallet = new Keychain({ store: { "__ethereum-keychain_": pvtKey } })
 
 wallet.info()
 
 ;(async () => {
 
   await wallet.netInfo()
+
+  console.log("sending transaction to self")
   await wallet.sendTXSelf()
+
   await wallet.netInfo()
   const process = require('process')
   process.exit()

eth-keychain-lib.js

@@ -1,6 +1,7 @@
 const { gasPriceDefault } = require("./eth-keychain-env")
 
-const txAttrsXDai = ({ to, value }) => ({
+// tx attrs with 21k gas and 1 gwei gasprice (good for xdai, cheapeth, etc...)
+const txAttrsCheapEthChains = ({ to, value }) => ({
   // gasPrice: 0, // for testnets
   gasPrice: gasPriceDefault() || "1000000000", // 1 gwei
   gas:      "21000",
@@ -19,6 +20,6 @@ const resolveTxHash = (txHashPromise) => (
 )
 
 module.exports = {
-  txAttrsXDai:   txAttrsXDai,
-  resolveTxHash: resolveTxHash,
+  txAttrsCheapEthChains:  txAttrsCheapEthChains,
+  resolveTxHash:          resolveTxHash,
 }