get-rates API improved

- get-rates API will now give a countDown timer
- this will be time at which next price update will happen unless a trade occurs
- Update: _constants.js for previous update

src/_constants.js

@@ -1,7 +1,6 @@
 module.exports = {
     app: {
         BLOCKCHAIN_REFRESH_INTERVAL: 1 * 60 * 60 * 1000, //1 hr
-        PERIOD_INTERVAL: 15 * 60 * 1000 // 15 min
     },
     request: {
         SIGN_EXPIRE_TIME: 5 * 60 * 1000, //5 mins
@@ -9,6 +8,9 @@ module.exports = {
         INVALID_SERVER_MSG: "INCORRECT_SERVER_ERROR" //Should be reflected in public backend script
     },
     market: {
+        PERIOD_INTERVAL: 5 * 60 * 1000, //5 min,
+        WAIT_TIME: 2 * 60 * 1000, //2 mins,
+        LAUNCH_SELLER_TAG: "launch-seller",
         MAXIMUM_LAUNCH_SELL_CHIPS: 250000,
         TRADE_HASH_PREFIX: "z1",
         TRANSFER_HASH_PREFIX: "z0"

src/market.js

@@ -695,6 +695,9 @@ module.exports = {
     get rates() {
         return coupling.price.currentRates;
     },
+    get priceCountDown() {
+        return coupling.price.lastTimes;
+    },
     addBuyOrder,
     addSellOrder,
     cancelOrder,

src/price.js

@@ -207,5 +207,11 @@ module.exports = {
     },
     get currentRates() {
         return Object.assign({}, currentRate);
+    },
+    get lastTimes() {
+        let countDown = {};
+        for (let asset in lastTime)
+            countDown[asset] = lastTime[asset] + MIN_TIME;
+        return countDown;
     }
 }

src/request.js

@@ -400,16 +400,23 @@ function GetRates(req, res) {
         res.status(INVALID.e_code).send(INVALID_SERVER_MSG);
     else {
         let asset = req.query.asset,
-            rates = market.rates;
+            rates = market.rates,
+            countDown = market.priceCountDown;
         if (asset) {
             if (asset in rates)
-                res.send(rates[asset].toString());
+                res.send({
+                    asset: asset,
+                    rate: rates[asset],
+                    countDown: countDown[asset]
+                });
             else
                 res.status(INVALID.e_code).send("Invalid asset parameter");
         } else
-            res.send(rates);
+            res.send({
+                rates,
+                countDown
+            });
     }
-
 }
 
 function GetRateHistory(req, res) {