Request retry and idempotence control suggestions in PHP Huawei Cloud API interface docking

Request retry and idempotence control suggestions in PHP Huawei Cloud API interface docking

In the process of using Huawei Cloud API interface for development, we often encounter some network request failures. . This could be due to network errors, server errors, or other reasons. In order to ensure the reliability and stability of interface calls, we need to retry the request and consider the idempotence control of the interface. In this article, I will introduce you to some request retry and idempotence control suggestions in PHP when connecting to Huawei Cloud API, and give corresponding code examples.

Request retry suggestions:

1. Set the maximum number of retries: When making an API interface request, we can set the maximum number of retries. If the request fails, it is retried until the maximum number of retries is reached.
2. Set the retry interval: When retrying, we should set an appropriate time interval to avoid excessive pressure on the interface and server caused by high-frequency requests in a short period of time. You can set an exponential growth interval so that the time interval between each retry gradually increases to reduce the load on the interface and server.

The following is a sample code that demonstrates how to retry requests when connecting to Huawei Cloud API in PHP:

function sendRequest($url, $data){
    $maxRetries = 3; // 最大重试次数
    $retryInterval = 1000; // 重试间隔，单位为毫秒

    $retryCount = 0; // 当前重试次数
    $response = null;

    while($retryCount < $maxRetries){
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_POST, true);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

        $response = curl_exec($ch);
        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

        if($httpCode == 200){
            break; // 请求成功，跳出重试循环
        }

        $retryCount++;
        usleep($retryInterval * $retryCount); // 增加重试时间间隔

        curl_close($ch);
    }

    return $response;
}

Impotent control suggestions:
In order to avoid To avoid side effects caused by repeated requests during the retry process, we need to ensure the idempotence of the interface. Idempotence means that executing the same operation multiple times produces the same result or has the same effect as executing it once. For interfaces with side effects (such as creating resources, updating resources, etc.), idempotent control needs to be considered in the interface design.

The following are some common idempotence control methods:

1. Use unique identification: When making an interface request, you can generate a unique identification (such as UUID) as an interface request a part of. The server can avoid processing duplicate requests by determining this identifier.
2. Use version numbers: For resource update operations, you can use version numbers to control the atomicity of updates. During each update operation, you need to check whether the current version number is consistent with the version number in the request. If they are consistent, the update operation is performed; if they are inconsistent, an error message is returned.

The following is a sample code that demonstrates how to control idempotence when connecting to Huawei Cloud API in PHP:

function createResource($data){
    $url = 'https://api.example.com/resource';
    $idempotencyKey = generateIdempotencyKey(); // 生成幂等性键

    $ch = curl_init($url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Idempotency-Key: '.$idempotencyKey));

    $response = curl_exec($ch);
    $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);

    curl_close($ch);

    return $response;
}

In the above code, we add a custom HTTP header Idempotency-Key to specify the idempotency key.

Summary:
Through reasonable settings of request retry and idempotence control, we can improve the reliability and stability of the interface when connecting to Huawei Cloud API interfaces. Reasonable use of request retry and implementation of idempotent control can avoid problems caused by interface call failure due to network failures or other reasons. I hope the suggestions and examples in this article can help you with request retry and idempotence control when connecting to Huawei Cloud API in PHP.

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