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[英]How to upload a file to S3 from the /tmp folder in AWS Lambda using Node.js
[英]How to read CSV data from S3 using Node.js AWS Lambda function
我有一個 Node.js AWS Lambda function 並且我正在嘗試從 ZCC8D68C551C4A9A6D5313E 中的 ZCC8D68C551C4A9A6D5313E 文件中讀取記錄並打印其內容。
下面是我實現相同的代碼,但是我得到 Null 為 output。
代碼:
const AWS = require('aws-sdk');
const s3 = new AWS.S3();
const csv = require('csv-parser');
const bucket = 'awslambdabuckets';
const objectkey = 'record.csv';
const params = { Bucket: bucket, Key: objectkey };
const results = [];
exports.handler = async function (event, ctx, callback) {
try {
const file = s3.getObject(params).createReadStream();
file
.pipe(csv())
.on('data', function (data) {
results.push;
})
.on('end', () => {
console.log(results);
callback(null, results);
});
} catch (err) {
console.log(err);
callback(Error(err));
}
};
有人可以幫我指出問題所在以及如何解決。
您沒有將數據推送到結果,請查看並進行如下更改
exports.handler = async function (event, ctx, callback) {
try {
const file = s3.getObject(params).createReadStream();
file
.pipe(csv())
.on('data', function (data) {
results.push(data);
})
.on('end', () => {
console.log(results);
callback(null, results);
});
} catch (err) {
console.log(err);
callback(Error(err));
}
};
您沒有將數據推送到數組:
const AWS = require('aws-sdk');
const s3 = new AWS.S3();
const csv = require('csv-parser');
const bucket = 'awslambdabuckets';
const objectkey = 'record.csv';
const params = { Bucket: bucket, Key: objectkey };
const results = [];
exports.handler = function (event, ctx, callback) {
try {
const file = s3.getObject(params).createReadStream();
file
.pipe(csv())
.on('data', function (data) {
results.push(data); // --> here
})
.on('end', () => {
console.log(results);
callback(null, results);
});
} catch (err) {
console.log(err);
callback(Error(err));
}
};
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