RanchiMall/exchangemarket
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Update market.js

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- Added get rates function
- Added interval for match buy n sell function
- Added checks for buy and sell order placement
- Fixed minor bugs
This commit is contained in:
sairajzero 2021-09-02 04:57:55 +05:30
parent 0d84962b8a
commit 3eb9499713
1 changed files with 71 additions and 5 deletions
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76
src/market.js
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@ -1,10 +1,55 @@
var net_FLO_price; //container for FLO price (from API or by model)
var DB; //container for database
const REFRESH_INTERVAL = 60 * 1000; //1 min
function getRates() {
return new Promise((resolve, reject) => {
getRates.FLO_USD().then(FLO_rate => {
getRates.USD_INR().then(INR_rate => {
net_FLO_price = FLO_rate * INR_rate;
console.debug('Rates:', FLO_rate, INR_rate, net_FLO_price);
resolve(net_FLO_price);
}).catch(error => reject(error))
}).catch(error => reject(error))
})
}
getRates.FLO_USD = function() {
return new Promise((resolve, reject) => {
fetch('https://api.coinlore.net/api/ticker/?id=67').then(response => {
if (response.ok) {
response.json()
.then(result => resolve(result[0].price_usd))
.catch(error => reject(error));
} else
reject(response.status);
}).catch(error => reject(error));
});
}
getRates.USD_INR = function() {
return new Promise((resolve, reject) => {
fetch('https://api.exchangerate-api.com/v4/latest/usd').then(response => {
if (response.ok) {
response.json()
.then(result => resolve(result.rates['INR']))
.catch(error => reject(error));
} else
reject(response.status);
}).catch(error => reject(error));
});
}
function addSellOrder(floID, quantity, min_price) {
return new Promise((resolve, reject) => {
if (!floID || !floCrypto.validateAddr(floID))
return reject(INVALID("Invalid FLO ID"));
else if (typeof quantity !== "number" || quantity <= 0)
return reject(INVALID(`Invalid quantity (${quantity})`));
else if (typeof min_price !== "number" || min_price <= 0)
return reject(INVALID(`Invalid min_price (${min_price})`));
DB.query("SELECT SUM(quantity) as total FROM Vault WHERE floID=?", [floID]).then(result => {
let total = result.pop()["total"];
let total = result.pop()["total"] || 0;
if (total < quantity)
return reject(INVALID("Insufficient FLO"));
DB.query("SELECT SUM(quantity) as locked FROM SellOrder WHERE floID=?", [floID]).then(result => {
@ -49,7 +94,15 @@ function addSellOrder(floID, quantity, min_price) {
function addBuyOrder(floID, quantity, max_price) {
return new Promise((resolve, reject) => {
if (!floID || !floCrypto.validateAddr(floID))
return reject(INVALID("Invalid FLO ID"));
else if (typeof quantity !== "number" || quantity <= 0)
return reject(INVALID(`Invalid quantity (${quantity})`));
else if (typeof max_price !== "number" || max_price <= 0)
return reject(INVALID(`Invalid max_price (${max_price})`));
DB.query("SELECT rupeeBalance FROM Users WHERE floID=?", [floID]).then(result => {
if (result.length < 1)
return reject(INVALID("FLO ID not registered"));
let total = result.pop()["rupeeBalance"];
if (total < quantity * max_price)
return reject(INVALID("Insufficient Rupee balance"));
@ -75,6 +128,8 @@ function matchBuyAndSell() {
getBestSeller(buyer_best.quantity, cur_price).then(result => {
let seller_best = result.sellOrder,
txQueries = result.txQueries;
console.debug("Sell:", seller_best.id, "Buy:", buyer_best.id);
//process the Txn
var tx_quantity;
if (seller_best.quantity > buyer_best.quantity)
@ -96,7 +151,7 @@ function matchBuyAndSell() {
function getBestBuyer(cur_price, n = 0) {
return new Promise((resolve, reject) => {
DB.query("SELECT * FROM BuyOrder WHERE maxPrice >= ? ORDER BY time_placed LIMIT=?,1", [cur_price, n]).then(result => {
DB.query("SELECT * FROM BuyOrder WHERE maxPrice >= ? ORDER BY time_placed LIMIT ?,1", [cur_price, n]).then(result => {
let buyOrder = result.shift();
if (!buyOrder)
return reject("No valid buyers available");
@ -117,7 +172,7 @@ function getBestBuyer(cur_price, n = 0) {
function getBestSeller(maxQuantity, cur_price, n = 0) {
return new Promise((resolve, reject) => {
//TODO: Add order conditions for priority.
DB.query("SELECT * FROM SellOrder WHERE minPrice <=? ORDER BY time_placed LIMIT=?,1", [cur_price, n]).then(result => {
DB.query("SELECT * FROM SellOrder WHERE minPrice <=? ORDER BY time_placed LIMIT ?,1", [cur_price, n]).then(result => {
let sellOrder = result.shift();
if (!sellOrder)
return reject("No valid sellers available");
@ -171,7 +226,7 @@ function processBuyOrder(seller_best, buyer_best, txQueries) {
}
function processSellOrder(seller_best, buyer_best, txQueries) {
let quantity = buyer_best.quantity;
let quantity = seller_best.quantity;
//Sell order is completed, buy order is partially done.
txQueries.push(["DELETE FROM SellOrder WHERE id=?", [seller_best.id]]);
txQueries.push(["UPDATE BuyOrder SET quantity=quantity-? WHERE id=?", [quantity, buyer_best.id]]);
@ -193,7 +248,7 @@ function updateBalance(seller_best, buyer_best, txQueries, cur_price, quantity)
//Add coins to Buyer
txQueries.push(["INSERT INTO Vault(floID, base, quantity) VALUES (?, ?, ?)", [buyer_best.floID, cur_price, quantity]])
//Record transaction
txQueries.push(["INSERT INTO Transactions (seller, buyer, quantity, unitValue) VALUES (?, ?, ?)", [seller_best.floID, buyer_best.floID, quantity, cur_price]]);
txQueries.push(["INSERT INTO Transactions (seller, buyer, quantity, unitValue) VALUES (?, ?, ?, ?)", [seller_best.floID, buyer_best.floID, quantity, cur_price]]);
return;
}
@ -237,6 +292,17 @@ function getAccountDetails(floID) {
});
}
function intervalFunction() {
let old_rate = net_FLO_price;
getRates().then(cur_rate => {
matchBuyAndSell();
}).catch(error => console.error(error));
}
intervalFunction();
let refresher = setInterval(intervalFunction, REFRESH_INTERVAL);
module.exports = {
addBuyOrder,
addSellOrder,