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getSpecs.js
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getSpecs.js
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const pdf = require("pdf-parse");
const fetch = require("node-fetch");
const mongoose = require("mongoose");
const model = require("./api/models/cullModel");
const config = require("./config");
const dbURI = process.env.dbURI || config.dbURI;
mongoose.Promise = global.Promise;
mongoose.connect(dbURI, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
async function getPdfBuffer(pdfURI) {
try {
const response = await fetch(pdfURI);
const buffer = await response.buffer();
return buffer;
} catch (error) {
console.log(error);
}
}
async function getPdfAsString(pdfBuffer) {
try {
const pdfData = await pdf(pdfBuffer);
return pdfData.text;
} catch (error) {
console.log(error);
}
}
function getBacDatafromString(inputString) {
const inputLines = inputString.split("\n");
let BacData = [];
let BacString = "";
let reading = false;
for (const line of inputLines) {
let result = /BAC[0-9,-]+[A-Z]+/.test(line);
let result_end = /[0-9]+-[A-Z]+-[0-9]+/.test(line);
if (result) {
reading = true;
}
if (reading) {
BacString += line;
}
if (reading && result_end) {
BacData.push(BacString.replace(/\s+/g, " ").trim());
BacString = "";
reading = false;
}
}
return BacData;
}
function getBacJsonFromList(inputList) {
let BacJSON = {};
for (const spec of inputList) {
let specObject = getSpecAsJSON(spec);
BacJSON[specObject["specification"]] = specObject;
}
return BacJSON;
}
function getSpecAsJSON(spec) {
const specArray = spec.split(" ");
const specArrayLength = specArray.length;
const specName = specArray[0].match(/BAC[0-9-]+/)[0];
const specRev = specArray[0].match(/[A-Z]+$/)[0];
const specDate = specArray[specArrayLength - 1];
let specTitle = "";
for (let i = 1; i < specArrayLength - 1; i++) {
specTitle += specArray[i] + " ";
}
specTitle = specTitle.slice(0, -1);
specTitle = specTitle.replace(/'"'/g, "'");
const output = {
specification: specName,
revision: specRev,
title: specTitle,
date: specDate,
};
return output;
}
async function getSpecs(keepAlive = true) {
const attempts = 3;
for (let i = 0; i < attempts; i++) {
try {
const json = await getBacJson();
const updates = await pushJsonToDatabase(json);
const closeDB = await closeDatabaseConnection(updates, keepAlive);
return closeDB;
} catch {}
}
}
async function getBacJson() {
try {
const specURI =
"http://active.boeing.com/doingbiz/d14426/bac_specrev.pdf";
console.log("Downloading PDF...");
const stream = await getPdfBuffer(specURI);
console.log("Converting PDF to string...");
const dataString = await getPdfAsString(stream);
console.log("Removing unwanted data from string...");
const BacSpecsList = getBacDatafromString(dataString);
console.log("Converting string to JSON...");
return getBacJsonFromList(BacSpecsList);
} catch (e) {
console.log(e);
}
}
async function pushJsonToDatabase(json) {
try {
const BacSpecs = Object.keys(json);
console.log(`Found ${BacSpecs.length} specs...`);
let updates = { error: 0, new: 0, update: 0, "no action": 0 };
for (const BacSpec of BacSpecs) {
const currentSpec = json[BacSpec];
let output = await processSpec(currentSpec);
updates[output]++;
}
return updates;
} catch (error) {
console.log(error);
}
}
async function processSpec(spec) {
const specName = spec["specification"];
let response = "no action";
const query = await model
.find({ specification: specName }, (err, data) => {
if (err) {
console.log(err);
response = "error";
}
let dbSpec = data.filter(
(specObject) => specObject["specification"] === specName
);
// If database doesn't have the spec, create it.
if (dbSpec.length == 0) {
response = "new";
model.create(spec);
}
// If database doesn't have the latest data, update it.
else if (dbSpec["revision"] != spec["revision"]) {
response = "update";
model
.findByIdAndUpdate(
dbSpec._id,
{ ...dbSpec, revision: spec["revision"] },
(error, data) => {
if (error) {
console.log(error);
}
}
)
.clone();
}
})
.clone();
return response;
}
async function closeDatabaseConnection(updates, keepAlive = true) {
let errors_count = updates["error"];
let new_specs_count = updates["new"];
let updated_specs_count = updates["update"];
new_specs_count &&
console.log(
`Added ${new_specs_count} new specifications to the database...`
);
updated_specs_count &&
console.log(
`Updated ${updated_specs_count} specifications in the database...`
);
errors_count && console.log(`Found ${errors_count} errors...`);
await Promise.all(
mongoose
.modelNames()
.map((model) => mongoose.model(model).ensureIndexes())
).then(() => (keepAlive ? null : mongoose.disconnect()));
}
module.exports = getSpecs;