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docs/ccxt/examples/js/load-markets-to-files.js

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+
+
+import ccxt from '../../js/ccxt.js';
+import path from 'path';
+import fs from 'fs';
+
+const enableRateLimit = true,
+      // exchange defaults
+      // ------------------------------------------------------------------------
+      // path to your folder, for example '/myproject/markets' or 'C:/myproject/markets'
+      options = { enableRateLimit },
+      // writes to current working directory if left empty
+      // ------------------------------------------------------------------------
+      // use a reasonable value for maxConcurrency to avoid network congestion
+      // a burst of requests in a short period of time will cause
+      // excessive competition for networking resources within the application
+      folder = '',
+      maxConcurrency = 7;
+
+async function main () {
+
+    const allExchanges = ccxt.exchanges.map (id => {
+            try {
+                return new ccxt[id] (options)
+            } catch (e) {
+                console.log ('Failed to initialize', id, e.constructor.name)
+            }
+        }).filter (x => x)
+        , allExchangesByIds = ccxt.indexBy (allExchanges, 'id')
+        , exchangeIds = Object.keys (allExchangesByIds)
+
+    const load = async () => {
+        while (exchangeIds.length > 0) {
+            const id = exchangeIds.pop ()
+            const exchange = allExchangesByIds[id]
+            const file = path.join (folder, `saved-markets-${exchange.id}.json`)
+            try {
+                await exchange.loadMarkets ()
+                const { id, markets } = exchange
+                await writeFile (file, JSON.stringify ({ id, markets }))
+                console.log ('Loaded markets from', id, 'to', file)
+            } catch (e) {
+                console.log ('Failed to load markets from', id, 'to', file, e.constructor.name)
+            }
+        }
+    }
+
+    const started = ccxt.milliseconds ()
+    const loaders = Array (maxConcurrency).fill ().map (x => load ())
+    await Promise.all (loaders)
+    const stopped  = ccxt.milliseconds ()
+    console.log ('Done loading', allExchanges.length, 'exchanges in', ((stopped - started) / 1000).toFixed (2), 'seconds')
+
+    // other code...
+}
+
+main ()