错误处理概述 - try/catch

ccxt采用各种语言中原生的异常机制进行错误处理。

要处理错误，你需要使用try代码块来保护调用ccxt统一API的代码， 然后使用catch代码块捕捉异常。示例代码如下。

JavaScript：

// try to call a unified method
try {
    const response = await exchange.fetchTicker ('ETH/BTC')
    console.log (response)
} catch (e) {
    // if the exception is thrown, it is "caught" and can be handled here
    // the handling reaction depends on the type of the exception
    // and on the purpose or business logic of your application
    if (e instanceof ccxt.NetworkError) {
        console.log (exchange.id, 'fetchTicker failed due to a network error:', e.message)
        // retry or whatever
        // ...
    } else if (e instanceof ccxt.ExchangeError) {
        console.log (exchange.id, 'fetchTicker failed due to exchange error:', e.message)
        // retry or whatever
        // ...
    } else {
        console.log (exchange.id, 'fetchTicker failed with:', e.message)
        // retry or whatever
        // ...
    }
}

Python：

try:
    response = await exchange.fetch_order_book('ETH/BTC')
    print(response)
except ccxt.NetworkError as e:
    print(exchange.id, 'fetch_order_book failed due to a network error:', str(e))
    # retry or whatever
    # ...
except ccxt.ExchangeError as e:
    print(exchange.id, 'fetch_order_book failed due to exchange error:', str(e))
    # retry or whatever
    # ...
except Exception as e:
    print(exchange.id, 'fetch_order_book failed with:', str(e))
    # retry or whatever
    # ...

PHP：

// try to call a unified method
try {
    $response = $exchange->fetch_trades('ETH/BTC');
    print_r($response);
} catch (\ccxt\NetworkError $e) {
    echo $exchange->id . ' fetch_trades failed due to a network error: ' . $e->getMessage () . "\n";
    // retry or whatever
    // ...
} catch (\ccxt\ExchangeError $e) {
    echo $exchange->id . ' fetch_trades failed due to exchange error: ' . $e->getMessage () . "\n";
    // retry or whatever
    // ...
} catch (Exception $e) {
    echo $exchange->id . ' fetch_trades failed with: ' . $e->getMessage () . "\n";
    // retry or whatever
    // ...
}