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api.js
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api.js
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const AWS = require("aws-sdk");
const dynamodb = new AWS.DynamoDB.DocumentClient();
const getAllData = async (params, allData = []) => {
const data = await dynamodb.query(params).promise();
if (data['Items'].length > 0) {
allData = [...allData, ...data['Items']];
}
if (data.LastEvaluatedKey) {
params.ExclusiveStartKey = data.LastEvaluatedKey;
return await getAllData(params, allData);
} else {
return allData;
}
};
exports.handler = async(event) => {
const response = {
statusCode: 200,
body: JSON.stringify({ "Items": [] }),
headers: {
"Content-Type": "application/json",
"Access-Control-Allow-Headers": "Content-Type",
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Methods": "OPTIONS,POST,GET"
}
};
const { device, startDate, endDate } = event.queryStringParameters;
switch (event.requestContext.http.method) {
case 'GET':
const dateExp = startDate && endDate ? ` and server_time between :st and :et` : '';
const exp = "dev_eui = :v1" + dateExp;
const params = {
ExpressionAttributeValues: {
":v1": device,
":st": startDate,
":et": endDate
},
KeyConditionExpression: exp,
TableName: "safetrack-data"
};
try {
const data = await getAllData(params);
response.body = JSON.stringify(data);
}
catch (error) {
response.body = JSON.stringify({ "status": error });
response.statusCode = 400;
console.log('An error occured querying DynamoDB: ', error);
}
return response;
default:
return response;
}
};