Publish Nerbus source snapshot and build documentation

lib/apis/coingecko.js

@@ -0,0 +1,116 @@
+const request = require('postman-request');
+const base_url = 'https://api.coingecko.com/api/v3/';
+const Decimal = require('decimal.js');
+
+function get_coin_list(api_key, cb) {
+  request({ uri: base_url + 'coins/list?include_platform=false' + (api_key == null || api_key == '' ? '' : '&x_cg_demo_api_key=' + api_key), json: true}, function (error, response, body) {
+    if (error)
+      return cb(error, []);
+    else if (body == null || body == '' || typeof body !== 'object')
+      return cb('No data returned', []);
+    else if (body['status'] != null && body['status']['error_message'] != null && body['status']['error_message'] != '')
+      return cb(body['status']['error_message'], []);
+    else
+      return cb(null, body);
+  });
+}
+
+function get_simple_price(id, currency, market_array, api_key, cb) {
+  request({ uri: base_url + `simple/price?ids=${id.toLowerCase()}&vs_currencies=usd${currency == null || currency == '' ? '' : `,${currency}`}` + (api_key == null || api_key == '' ? '' : '&x_cg_demo_api_key=' + api_key), json: true}, function (error, response, body) {
+    if (error)
+      return cb(error, new Decimal('0'), new Decimal('0'));
+    else if (body == null || body == '' || typeof body !== 'object')
+      return cb('No data returned', new Decimal('0'), new Decimal('0'));
+    else if (body['status'] != null && body['status']['error_message'] != null && body['status']['error_message'] != '')
+      return cb(body['status']['error_message'], new Decimal('0'), new Decimal('0'));
+    else {
+      try {
+        if (market_array != null) {
+          // multiple currencies need to be combined before return
+          let last_price = new Decimal('0');
+          let last_usd_price = new Decimal('0');
+          let counter = 0;
+          let api_market = null;
+
+          // check if the currency variable is set
+          if (currency != null && currency != '') {
+            // find the market currency in the market_array
+            const base_index = market_array.findIndex(p => p.currency.toLowerCase() == currency.toLowerCase());
+
+            // check if the currency is found in the market_array
+            if (base_index > -1) {
+              // find the api market data row
+              api_market = body[market_array[base_index].coingecko_id.toLowerCase()];
+            }
+          }
+
+          // loop through all api object keys
+          Object.keys(body).forEach(function(key, index, map) {
+            const market_index = market_array.findIndex(p => p.coingecko_id.toLowerCase() == key.toLowerCase());
+
+            // check if the currency is found in the market_array
+            if (market_index > -1) {
+              // determine if the api already returned the market price
+              if (currency != null && currency != '' && body[key][currency.toLowerCase()] != null) {
+                // calculate the market price
+                last_price = last_price.add(new Decimal(market_array[market_index].last_price.toString()).mul(new Decimal((currency == null || currency == '' ? new Decimal('0') : new Decimal(body[key][currency.toLowerCase()].toString())))));
+              } else {
+                // check if the market currency exists in the api data
+                if (api_market != null) {
+                  // calculate the currency ratio
+                  const ratio = new Decimal(api_market['usd'].toString()).div(body[key]['usd'].toString());
+
+                  // calculate the market price
+                  last_price = last_price.add(new Decimal(market_array[market_index].last_price.toString()).div(ratio));
+                }
+              }
+
+              // calculate the usd price
+              last_usd_price = last_usd_price.add(new Decimal(market_array[market_index].last_price.toString()).mul(body[key]['usd'].toString()));
+
+              counter++;
+            }
+          });
+
+          // check if the counter is greater than 0
+          if (counter > 0) {
+            // average the market and usd prices
+            last_price = last_price.div(counter.toString());
+            last_usd_price = last_usd_price.div(counter.toString());
+          }
+
+          return cb(null, last_price, last_usd_price);
+        } else {
+          // single currency
+          return cb(null, (currency == null || currency == '' ? new Decimal('0') : new Decimal(body[id.toLowerCase()][currency.toLowerCase()].toString())), new Decimal(body[id.toLowerCase()]['usd'].toString()));
+        }
+      } catch(err) {
+        return cb('Received unexpected API data response', new Decimal('0'), new Decimal('0'));
+      }
+    }
+  });
+}
+
+module.exports = {
+  get_coin_data: function (api_key, cb) {
+    get_coin_list(api_key, function (err, coin_list) {
+      return cb(err, coin_list);
+    });
+  },
+  get_market_prices: function (id, currency, api_key, cb) {
+    get_simple_price(id, currency, null, api_key, function (err, last_price, last_usd) {
+      if (last_price == null)
+        console.log(`Error: "${currency}" is not a valid coingecko api currency`);
+
+      return cb(err, last_price, last_usd);
+    });
+  },
+  get_avg_market_prices: function (id, currency, market_array, api_key, cb) {
+    get_simple_price(id, currency, market_array, api_key, function (err, last_price, last_usd) {
+      if (last_price == null)
+        console.log(`Error: "${currency}" is not a valid coingecko api currency`);
+
+      return cb(err, last_price, last_usd);
+    });
+  }
+};