更新时间:2024-02-05 GMT+08:00
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下载数据

功能介绍

本接口用于从DIS通道中下载数据。

调用方法

请参见如何调用API

URI

GET /v2/{project_id}/records

表1 路径参数

参数

是否必选

参数类型

描述

project_id

String

项目ID。

表2 Query参数

参数

是否必选

参数类型

描述

partition-cursor

String

数据游标,需要先通过获取数据游标的接口获取。

取值范围:1~512个字符。

说明:

数据游标有效期为5分钟。

max_fetch_bytes

Integer

每个请求获取记录的最大字节数。

注意:

该值如果小于分区中单条记录的大小,会导致一直无法获取到记录。

请求参数

表3 请求Header参数

参数

是否必选

参数类型

描述

X-Auth-Token

String

用户Token。

通过调用IAM服务获取用户Token接口获取(响应消息头中X-Subject-Token的值)。

响应参数

状态码: 200

表4 响应Body参数

参数

参数类型

描述

records

Array of Record objects

下载的记录列表。

next_partition_cursor

String

下一个迭代器。

说明:

数据游标有效期为5分钟。

表5 Record

参数

参数类型

描述

partition_key

String

用户上传数据时设置的partition_key。说明:上传数据时,如果传了partition_key参数,则下载数据时可返回此参数。如果上传数据时,未传partition_key参数,而是传入partition_id,则不返回partition_key。

sequence_number

String

该条数据的序列号。

data

String

下载的数据。

下载的数据为序列化之后的二进制数据(Base64编码后的字符串)。

比如下载数据接口返回的数据是“ZGF0YQ==”,“ZGF0YQ==”经过Base64解码之后是“data”。

timestamp

Long

记录写入DIS的时间戳。

timestamp_type

String

时间戳类型。

  • CreateTime:创建时间。

缺省值:CreateTime

请求示例

下载数据

GET https://{Endpoint}/v2/{project_id}/records

响应示例

状态码: 200

正常返回

{
  "records" : [ {
    "partition_key" : "0",
    "sequence_number" : "485",
    "data" : "MTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTEx",
    "timestamp" : 1527577402541,
    "timestamp_type" : "CreateTime"
  } ],
  "next_partition_cursor" : "eyJpdGVyR2VuVGltZSI6MTQ5MDk1MDE1Nzc0NywiU3RyZWFtTmFtZSI6IjY2MCIsIlNoYXJkSWQiOiIwIiwiU2hhcmRJdGVyYXRvclR5cGUiOiJBVF9TRVFVRU5DRV9OVU1CRVIiLCJTdGFydGluZ1NlcXVlbmNlTnVtYmVyIjoiMjIiLCJUaW1lU3RhbXAiOjB9"
}

SDK代码示例

SDK代码示例如下。

Java

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package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.dis.v2.region.disRegion;
import com.huaweicloud.sdk.dis.v2.*;
import com.huaweicloud.sdk.dis.v2.model.*;


public class ConsumeRecordsSolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");

        ICredential auth = new BasicCredentials()
                .withAk(ak)
                .withSk(sk);

        disClient client = disClient.newBuilder()
                .withCredential(auth)
                .withRegion(disRegion.valueOf("<YOUR REGION>"))
                .build();
        ConsumeRecordsRequest request = new ConsumeRecordsRequest();
        request.withPartitionCursor("<partition-cursor>");
        request.withMaxFetchBytes(<max_fetch_bytes>);
        try {
            ConsumeRecordsResponse response = client.consumeRecords(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

Python

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# coding: utf-8

from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkdis.v2.region.dis_region import disRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkdis.v2 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = __import__('os').getenv("CLOUD_SDK_AK")
    sk = __import__('os').getenv("CLOUD_SDK_SK")

    credentials = BasicCredentials(ak, sk) \

    client = disClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(disRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = ConsumeRecordsRequest()
        request.partition_cursor = "<partition-cursor>"
        request.max_fetch_bytes = <max_fetch_bytes>
        response = client.consume_records(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

Go

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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    dis "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dis/v2"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dis/v2/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dis/v2/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        Build()

    client := dis.NewdisClient(
        dis.disClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.ConsumeRecordsRequest{}
	request.PartitionCursor = "<partition-cursor>"
	maxFetchBytesRequest:= int32(<max_fetch_bytes>)
	request.MaxFetchBytes = &maxFetchBytesRequest
	response, err := client.ConsumeRecords(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

更多

更多编程语言的SDK代码示例,请参见API Explorer的代码示例页签,可生成自动对应的SDK代码示例。

状态码

状态码

描述

200

正常返回

错误码

请参见错误码

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