Add Medianizer deployment

migrations/3_DEV-deploy_price_feed.js

@@ -0,0 +1,44 @@
+/* global artifacts */
+/* eslint no-undef: "error" */
+const contract = require('truffle-contract')
+
+const ETH_USD_PRICE = 500
+const MAGIC_NUMBER_TO_BE_RENAMED = 1516168838 * 2
+
+const PriceFeed = artifacts.require('PriceFeed')
+const Medianizer = artifacts.require('Medianizer')
+const PriceOracleInterface = artifacts.require('PriceOracleInterface')
+
+function getMedianizerAddress () {
+  try {
+    return Medianizer.address 
+  } catch (error) {
+    // Medianizer.address throw an error if there's no config address
+    // As a result, only development should be deploying this contracts
+    return null
+  }  
+}
+
+
+module.exports = function (deployer, network, accounts) {
+  const medianizerAddress = getMedianizerAddress()
+  const account = accounts[0]
+  if (!medianizerAddress) {
+    console.log(`Deploying Maker Dao feed contracts, because they weren published in network "${network}" yet`)
+    // Deployment of PriceFeedInfrastructure
+    deployer.deploy([ PriceFeed, Medianizer ])
+      .then(() => deployer.deploy(PriceOracleInterface, account, Medianizer.address))
+      .then(() => Medianizer.deployed())
+      .then(medianizer => medianizer.set(PriceFeed.address, { from: account }))
+      .then(() => PriceFeed.deployed())
+      .then(priceFeed => priceFeed.post(
+        ETH_USD_PRICE * 1e18,
+        MAGIC_NUMBER_TO_BE_RENAMED,
+        Medianizer.address, {
+          from: account
+        })
+      )
+  } else {    
+    console.log(`No need to deploy theMaker Dao feed contracts. Using ${medianizerAddress} as the Medianizer address`)
+  }
+}