So at the moment i;m trying to generate a PDF (using Node.js, PDFKit and GCF) from a number of data within my Firebase Database. One of those items is an image URL but PDF kit requires this in a base64 format. At the moment the PDF is being created but i'm getting around 6 calls of "Ignoring exception from a finished function".
I think this is to do with the base64 function but i can't seem to nail down where the issue is... the function is returning its results after the onCreate is triggered but i thought "await" is meant to stop this? Any help / thoughts?
exports.onAppComplete = functions.database.ref("users/{appId}").onCreate((snapshot, context) =>{
var appId = context.params.appId;
var appDb = admin.database().ref(`Applications/${appId}`);
return Promise.all([appDb.once('value'),appId]).then(([applicationDb, appId])=>{
var application = {
appId:appId,
dogId:applicationDb.child("dogId").val(),
userId: applicationDb.child("appWith").val(),
};
const Logo = admin.database().ref(`users/logouri`);
return Promise.all([Logo.once('value')]).then(([Logo])=>{
const PDFDocument = require('pdfkit');
let doc = new PDFDocument({ margin: 72 });
doc.size = [595.28, 841.89];
doc
.image('./images/logo.png', 50, 45, { width: 100 })
.fillColor("#444444")
.moveDown(1);
var logoUri = Logo.val();
console.log("pictureURL",logoUri);
toBase64(logoUri,50,50,doc);
const myPdfFile = admin.storage().bucket().file('/test/Arbeitsvertrag.pdf');
const stream = doc.pipe(myPdfFile.createWriteStream());
doc.end();
return console.log('Successfully made App PDF:', "OK");
})
});
});
function toBase64(url, x, y, pdfdoc) {
return new Promise(async (resolve, reject)=>{
var https = require('https');
var req = await https.get(url, (res) => {
res.setEncoding('base64');
let body = "data:" + res.headers["content-type"] + ";base64,";
console.log("BODY", body)
res.on('data', (d) => {
body += d;
});
res.on('end', () => {
console.log("END", body)
pdfdoc.image(body, x, y);
resolve(res);
});
});
req.on('error', err => {
console.error('error!');
reject(err);
});
});
}
I'm using Node.js 8 and there is a seperate logo that is loaded locally.
after some prompting by doug...here's the code that answers this, it turns out that a Promise.all is key:
exports.onAppComplete = functions.database.ref("users/{appId}").onCreate((snapshot, context) =>{
var appId = context.params.appId;
var appDb = admin.database().ref(`Applications/${appId}`);
return Promise.all([appDb.once('value'),appId]).then(([applicationDb, appId])=>{
var application = {
appId:appId,
dogId:applicationDb.child("dogId").val(),
userId: applicationDb.child("appWith").val(),
};
const Logo = admin.database().ref(`users/logouri`);
return Promise.all([Logo.once('value')]).then(([Logo])=>{
const PDFDocument = require('pdfkit');
let doc = new PDFDocument({ margin: 72 });
doc.size = [595.28, 841.89];
doc
.image('./images/logo.png', 50, 45, { width: 100 })
.fillColor("#444444")
.moveDown(1);
var logoUri = Logo.val();
console.log("pictureURL",logoUri);
return Promise.all([toBase64(logoUri),doc,application]).then(([logoURIBase64, doc, application])=>{
doc.rect(0,0,590,70,40).fillAndStroke("#339999");
doc.image(logoURIBase64,50,50,{width:100});
const myPdfFile = admin.storage().bucket().file('/test/Arbeitsvertrag.pdf');
const stream = doc.pipe(myPdfFile.createWriteStream());
doc.end();
return console.log('Successfully made App PDF:', "OK");
});
const myPdfFile = admin.storage().bucket().file('/test/Arbeitsvertrag.pdf');
const stream = doc.pipe(myPdfFile.createWriteStream());
doc.end();
return console.log('Successfully made App PDF:', "OK");
})
});
});
function toBase64(url) {
return new Promise(async (resolve, reject)=>{
var https = require('https');
var req = await https.get(url, (res) => {
res.setEncoding('base64');
let body = "data:" + res.headers["content-type"] + ";base64,";
console.log("BODY", body)
res.on('data', (d) => {
body += d;
});
res.on('end', () => {
console.log("END", body)
pdfdoc.image(body, x, y);
resolve(body);
});
});
req.on('error', err => {
console.error('error!');
reject(err);
});
});
}