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UnemploymentClaims.js
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UnemploymentClaims.js
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const https = require('https');
const fs = require('fs');
const lineByLine = require('n-readlines');
// Checking if a file exists or not
const doFileExist = ( fileName ) => {
try {
fs.accessSync(fileName, fs.F_OK);
return true;
} catch (error) {
return false;
}
}
// Saving claim data
const save = (rawData, fileName) => {
try {
const parseData = JSON.parse(rawData);
// For column names
const columnsParsed = parseData.meta.view.columns;
var columns = columnsParsed.map( row => {
return row['id'] != '-1' ? row['name'] : '';
});
const totalLength = columns.length;
columns = columns.filter(item => item !== '');
const startIndex = totalLength - columns.length;
// For actual data
const dataParsed = parseData.data;
const data = dataParsed.map( row => {
return row.map((column, index) => {
if (index >= startIndex) {
return column;
} else {
return '';
}
}).filter(item => item !== '').join();
});
// Sorting data records
data.sort();
// Filtering out duplucated records
var dataUniq = [...new Set(data)];
// Combining with column names
dataUniq.unshift(columns.join(','));
// Saving to a file
fs.writeFileSync(fileName, dataUniq.join('\r\n'));
} catch (e) {
console.error(e.message);
}
}
// Downloading claims
const GetUnemploymentClaims = async ( url, fileName ) => {
return new Promise((resolve) => {
https.get(url, (res) => {
const { statusCode } = res;
const contentType = res.headers['content-type'];
let error;
if (statusCode !== 200) {
error = new Error('Request Failed.\n' +
`Status Code: ${statusCode}`);
} else if (!/^application\/json/.test(contentType)) {
error = new Error('Invalid claims-type.\n' +
`Expected application/json but received ${contentType}`);
}
if (error) {
console.error(error.message);
// Consume response data to free up memory
res.resume();
return;
}
res.setEncoding('utf8');
let rawData = '';
res.on('data', (chunk) => { rawData += chunk; });
res.on('end', () => {
// Saving claim data
resolve(save(rawData, fileName));
});
}).on('error', (e) => {
console.error(`Got error: ${e.message}`);
});
})
}
// Creating a file containg Record ID and Date as a key
const CreateKeys = ( inputFile, keyFile ) => {
let isExisted = doFileExist(keyFile);
if (isExisted) {
const liner = new lineByLine(inputFile);
const keyLiner = new lineByLine(keyFile);
let line;
let keyLine;
// Skip a line having column names
liner.next();
let keyData = [];
while (keyLine = keyLiner.next()) {
keyLine = keyLine.toString().replace( /[\r\n]+/gm, "" );
line = liner.next();
line = line.toString();
if (keyLine === line.substring(0,28)) {
keyData.push(keyLine);
} else if (keyLine > line.substring(0,28)) {
keyData.push(line.substring(0,28));
keyData.push(keyLine);
} else {
keyData.push(keyLine);
keyData.push(line.substring(0,28));
}
}
// Sorting records
keyData.sort();
// Removing duplucated records
keyDataUniq = [...new Set(keyData)];
const tempKeyFile = "tempKeyFile.txt";
fs.writeFileSync(tempKeyFile, keyDataUniq.join('\r\n'));
// Replacing the key file with the temp key file
fs.unlinkSync(keyFile);
fs.renameSync(tempKeyFile, keyFile, function(err) {
if ( err ) {
console.log('ERROR: ' + err);
}
});
} else {
const liner = new lineByLine(inputFile);
var fd = fs.openSync(keyFile, 'w');
let line;
// Skip a line having column names
liner.next();
while (line = liner.next()) {
line = line.toString();
fs.writeSync(fd, line.substring(0,28) + '\r\n');
}
// close the file
fs.closeSync(fd);
}
}
// Merging claim files using the key records
const MergeFiles = ( keyFile, inputFile, dataFile ) => {
let isExisted = doFileExist(dataFile);
if (isExisted) {
const keyData = fs.readFileSync(keyFile,{encoding:'utf8', flag:'r'}).split('\r\n');
const numberOfLines = keyData.length;
const inputData = fs.readFileSync(inputFile,{encoding:'utf8', flag:'r'}).split('\r\n');
const numberOfColumns = inputData[0].split(",").length - 2; // Computing number of columns excluding Record ID and Data columns
const dataLiner = new lineByLine(dataFile);
const tempFile = "temp.csv";
var fd = fs.openSync(tempFile, 'w');
let newLine;
let dataLine;
let isFound;
let count = 0;
while (dataLine = dataLiner.next()) {
dataLine = dataLine.toString().replace( /[\r\n]+/gm, "" );
isFound = false;
for (const inputLine of inputData) {
if (!inputLine.startsWith("Record")) {
if (keyData[count] === inputLine.substring(0,28)) {
newLine = dataLine + inputLine.substring(28);
isFound = true;
break;
}
}
}
if (!isFound) {
newLine = dataLine;
for (let i=0; i < numberOfColumns; ++i ) {
newLine = newLine + ',0';
}
}
count++;
if (count < numberOfLines) {
fs.writeSync(fd, newLine + '\r\n');
} else {
fs.writeSync(fd, newLine);
}
}
// close the file
fs.closeSync(fd);
fs.unlinkSync(dataFile);
fs.renameSync(tempFile, dataFile, function(err) {
if ( err ) {
console.log('ERROR: ' + err);
}
});
} else {
const keyData = fs.readFileSync(keyFile,{encoding:'utf8', flag:'r'}).split('\r\n');
const inputData = fs.readFileSync(inputFile,{encoding:'utf8', flag:'r'}).split('\r\n');
// Computing number of columns
const numberOfColumns = inputData[0].split(",").length;
let newLine;
let isFound;
let data = keyData.map(keyLine => {
isFound = false;
for (const inputLine of inputData) {
if (!inputLine.startsWith("Record")) {
if (keyLine === inputLine.substring(0,28)) {
newLine = keyLine.replace(",","") + inputLine.substring(28);
isFound = true;
break;
}
}
}
if (!isFound) {
newLine = keyLine.replace(",","");
for (let i=0; i < numberOfColumns - 2; ++i ) {
newLine = newLine + ',0';
}
}
return newLine;
});
fs.writeFileSync(dataFile, data.join('\r\n'));
}
}
module.exports = {
GetUnemploymentClaims,
MergeFiles,
CreateKeys
}