commit

docs/ccxt/examples/js/error-handling.js

@@ -0,0 +1,89 @@
+
+
+import ccxt from '../../js/ccxt.js';
+
+const verbose   = process.argv.includes ('--verbose');
+
+//-----------------------------------------------------------------------------
+
+const printSupportedExchanges = () => console.log ('Supported exchanges:', ccxt.exchanges.join (', '))
+
+const printUsage = () => {
+    console.log ('Usage: node', process.argv[1], 'id'.green)
+    printSupportedExchanges ()
+}
+
+const run = async (id) => {
+
+    // check if the exchange is supported by ccxt
+    const exchangeFound = ccxt.exchanges.indexOf (id) > -1
+
+    if (exchangeFound) {
+
+        console.log ('Instantiating', id, 'exchange')
+
+        // instantiate the exchange by id
+        const exchange = new ccxt[id] ({ verbose })
+
+        // try to load markets and catch the errors if any
+        try {
+
+            await exchange.loadMarkets ()
+
+        } catch (e) {
+
+            if (e instanceof ccxt.NetworkError) {
+                console.log (exchange.id, 'loadMarkets failed due to a network error:', e.message)
+            } else if (e instanceof ccxt.ExchangeError) {
+                console.log (exchange.id, 'loadMarkets failed due to exchange error:', e.message)
+            } else {
+                console.log (exchange.id, 'loadMarkets failed with:', e.message)
+            }
+
+            // rethrow the error "higher up" the call chain
+            throw e
+        }
+
+        // try to fetch a ticker and catch the errors if any
+        try {
+
+            const symbol = 'ETH/BTC'
+            const response = await exchange.fetchTicker (symbol)
+            console.log (response)
+
+        } catch (e) {
+
+            if (e instanceof ccxt.NetworkError) {
+                console.log (exchange.id, 'fetchTicker failed due to a network error:', e.message)
+            } else if (e instanceof ccxt.ExchangeError) {
+                console.log (exchange.id, 'fetchTicker failed due to exchange error:', e.message)
+            } else {
+                console.log (exchange.id, 'fetchTicker failed with:', e.message)
+            }
+
+            // rethrow the error "higher up" the call chain
+            throw e
+        }
+
+    } else {
+
+        console.log ('Exchange', id, 'not found')
+        printSupportedExchanges ()
+    }
+}
+
+;(async function main () {
+
+    if (process.argv.length > 2) {
+
+        let id = process.argv[2]
+        await run (id)
+
+    } else {
+
+        printUsage ()
+    }
+
+    process.exit ()
+
+}) ()