腾讯COS例程实践之云函数列举COS文件

云函数列举COS文件

COS的操作文档以及API请看网页:https://cloud.tencent.com/document/product/436/64982
从云函数例子中选择这个模板创建工程:

创建步骤这里不细说,但是有一点很关键,就是云函数和cos的域必须一样,也就是所在地要一样:

这里主要是因为本例程使用到了触发器的缘故,如果没有触发器,那就不需要同区域了!
云函数代码修改如下:

/**************************************************
Nodejs8.9 - GetCosObject
TIPS:
1. cos-nodejs-sdk-v5 do not support the use of promise and async/awaitREFERENCE:
1. https://cloud.tencent.com/document/product/436/12264 - COS-NODE-SDK documents
***************************************************/const COS = require('cos-nodejs-sdk-v5')
const fs = require('fs')// The cos authentication information
// 使用 cos 所需的鉴权/配置信息
const APPID = '13XXXX8232' // Replace it with your Appid, 请替换为您的腾讯云Appid
const SECRET_ID = 'AKIXXXXn7AxWt0sSlnZ4IHzRcW9WcRzHH0Sd' // Replace it with your SecretId, 请替换为您的 SecretId
const SECRET_KEY = 'wbz6XXXXc7LIyOXP0KNAgvta091cMp2y' // Replace it with your SecretKey, 请替换为您的 SecretKey
const REGION = 'ap-guangzhou' // Replace it with your bucket's region, 请替换为您bucket所在的地域// Initialize cosSDK
const cosInst = new COS({SecretId: SECRET_ID,SecretKey: SECRET_KEY
})
// This part is used to solve cosSDK-getObjec do not support promise
// 暂时解决cosSDK-getObject不支持promise的问题
cosInst.getObjectPromise = function(params) {return new Promise((resolve, reject) => {cosInst.getObject(params, function(err, data) {if (err) {reject(err)} else {resolve(data)}})})
}
cosInst.getBuckets = function(params) {return new Promise((resolve, reject) => {cosInst.getBucket(params, function(err, data) {if (err) {reject(err)} else {resolve(data)}})})
}exports.main_handler = async (event, context, callback) => {console.log('Start main handler')let promiseArr = []promiseArr.push(cosInst.getBuckets({Bucket: 'syXXXXXXXXvice-13XXXXXXXX2',  /* 填入您自己的存储桶，必须字段 */Region: 'ap-guangzhou',  /* 存储桶所在地域，例如ap-beijing，必须字段 *///Prefix: '*'           /* Prefix表示列出的object的key以prefix开始，非必须 */}).then(res => {console.log('getBuckets success1: ', res)}).catch(e => {throw (`Error getting object from bucket ${bucket}. Error message: ${JSON.stringify(e)}`)}))// /**//  * Ger original data from uploaded pictures and write them into temporary directory /tmp///  * 从cos上传的图片中，获取元数据，并写入到临时目录/tmp/中//  */// for (let record of event['Records']) {//   const bucket = `${record['cos']['cosBucket']['name']}-${APPID}`//   let key = record['cos']['cosObject']['key']//   key = key.replace(`/${APPID}/${record['cos']['cosBucket']['name']}/`, '') // Ectract the name of picture, 抽取出图片的名称//   console.log('Key is: ', key)//   const downloadPath = `/tmp/${key}`//   promiseArr.push(//     cosInst//       .getObjectPromise({//         Bucket: bucket,//         Region: REGION,//         Key: key//       })//       .then(res => {//         fs.writeFileSync(downloadPath, res['Body'])//         console.log('Download file success: ', key)//       })//       .catch(e => {//         throw (//           `Error getting object ${key} from bucket ${bucket}. Error message: ${JSON.stringify(//             e//           )}`//         )//       })//   )//  }try {await Promise.all(promiseArr)return 'Success'} catch(e) {console.log(e)return 'Fail'}

这时候如果在COS上传一个图片,可以看到云函数这里有如下日志:

START RequestId: e1651c55-2d82-4d3b-9c49-9eb744dec6eeInit Report RequestId: e1651c55-2d82-4d3b-9c49-9eb744dec6ee Coldstart: 440ms (PullCode: 93ms InitRuntime: 6ms InitFunction: 341ms) Memory: 128MB MemUsage: 28.12MB2022-03-11T09:26:31.867Z e1651c55-2d82-4d3b-9c49-9eb744dec6ee Start main handler
2022-03-11T09:26:31.942Z e1651c55-2d82-4d3b-9c49-9eb744dec6ee getBuckets success1: { Name: ‘XXXXXXXX’,
Prefix: ‘’,
Marker: ‘’,
MaxKeys: ‘1000’,
IsTruncated: ‘false’,
Contents:
[ { Key: ‘bom - 副本 (2).png’,
LastModified: ‘2022-03-11T08:42:28.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom - 副本 (3).png’,
LastModified: ‘2022-03-11T08:44:29.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom - 副本 (4).png’,
LastModified: ‘2022-03-11T08:46:03.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom - 副本 (5).png’,
LastModified: ‘2022-03-11T08:53:04.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom - 副本 (6).png’,
LastModified: ‘2022-03-11T09:01:17.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom - 副本 (7).png’,
LastModified: ‘2022-03-11T09:03:08.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom - 副本 (8).png’,
LastModified: ‘2022-03-11T09:05:11.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom - 副本 (9).png’,
LastModified: ‘2022-03-11T09:26:30.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom.png’,
LastModified: ‘2022-03-11T08:35:03.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘子板BOM确定清单.png’,
LastModified: ‘2022-03-11T08:40:34.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ } ],
CommonPrefixes: [],
statusCode: 200,
headers:
{ ‘content-type’: ‘application/xml’,
‘content-length’: ‘3423’,
connection: ‘close’,
date: ‘Fri, 11 Mar 2022 09:26:31 GMT’,
server: ‘tencent-cos’,
‘x-cos-bucket-region’: ‘ap-guangzhou’,
‘x-cos-request-id’: ‘NjIyYjE1YzdfYzcyZjJjMGJfNGYxYV9mNzdkNGEy’ } }
Response RequestId:e1651c55-2d82-4d3b-9c49-9eb744dec6ee RetMsg:“Success”
END RequestId:e1651c55-2d82-4d3b-9c49-9eb744dec6ee
Report RequestId:e1651c55-2d82-4d3b-9c49-9eb744dec6ee Duration:80ms Memory:128MB MemUsage:30.275459MB
其实经过上面代码的修改,并不需要触发器就可以直接测试运行代码了,测试运行代码打印的log如下:

Invoke function GetCOSObject-1646965787 [RequestId:b269d9b3-b886-47d9-a01b-6e14a0910557]
Response:
“Success”
Output:
START RequestId: b269d9b3-b886-47d9-a01b-6e14a0910557
Event RequestId: b269d9b3-b886-47d9-a01b-6e14a0910557
2022-03-11T09:37:45.822Z b269d9b3-b886-47d9-a01b-6e14a0910557 Start main handler
2022-03-11T09:37:45.896Z b269d9b3-b886-47d9-a01b-6e14a0910557 getBuckets success1: { Name: ‘XXXXXXXX’,
Prefix: ‘’,
Marker: ‘’,
MaxKeys: ‘1000’,
IsTruncated: ‘false’,
Contents:
[ { Key: ‘bom - 副本 (2).png’,
LastModified: ‘2022-03-11T08:42:28.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom - 副本 (3).png’,
LastModified: ‘2022-03-11T08:44:29.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom - 副本 (4).png’,
LastModified: ‘2022-03-11T08:46:03.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom - 副本 (5).png’,
LastModified: ‘2022-03-11T08:53:04.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom - 副本 (6).png’,
LastModified: ‘2022-03-11T09:01:17.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom - 副本 (7).png’,
LastModified: ‘2022-03-11T09:03:08.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom - 副本 (8).png’,
LastModified: ‘2022-03-11T09:05:11.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom - 副本 (9).png’,
LastModified: ‘2022-03-11T09:26:30.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘bom.png’,
LastModified: ‘2022-03-11T08:35:03.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ },
{ Key: ‘子板BOM确定清单.png’,
LastModified: ‘2022-03-11T08:40:34.000Z’,
ETag: ‘“8d84c71801e6fb4b6dba4de0759f5bce”’,
Size: ‘4101709’,
Owner: [Object],
StorageClass: ‘STANDARD’ } ],
CommonPrefixes: [],
statusCode: 200,
headers:
{ ‘content-type’: ‘application/xml’,
‘content-length’: ‘3423’,
connection: ‘close’,
date: ‘Fri, 11 Mar 2022 09:37:45 GMT’,
server: ‘tencent-cos’,
‘x-cos-bucket-region’: ‘ap-guangzhou’,
‘x-cos-request-id’: ‘NjIyYjE4NjlfZDcyZjI3MGJfZjUzYl9kYjlhZWEz’ } }

END RequestId: b269d9b3-b886-47d9-a01b-6e14a0910557
Report RequestId: b269d9b3-b886-47d9-a01b-6e14a0910557 Duration:79ms Memory:128MB MemUsage:30.8274MB
Summary:
Request ID: b269d9b3-b886-47d9-a01b-6e14a0910557
Run Duration: 79
Bill Duration: 79
Usage Memory: 30.827438354492188
Invoke Result: 0
效果和触发器触发的一样!

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