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use promises

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This commit is contained in:
Thomas Ruoff
2017-02-24 21:17:10 +01:00
parent 722accbe5d
commit f51daddc65
3 changed files with 48 additions and 58 deletions
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23
server/index.js
View File

@@ -10,28 +10,19 @@ app.use(bodyParser.json());
app.options('/api/pdf/generate/:template');
app.post('/api/pdf/generate/:template', (req, res) => {
const templateName = req.params.template;
const options = req.body;
templates.get(templateName, options, (err, texDocument) => {
if (err) {
console.error('Error:', err.code, 'for', req.url);
res.sendStatus(500).end('Something went wrong while generating Tex source');
return;
}
renderer(texDocument, (err, pdfFilePath) => {
if (err) {
console.error('Error:', err.code, 'for', req.url);
res.sendStatus(500).end('Something went wrong while baking the PDF');
return;
}
const id = pdfFilePath.replace('/tmp/', '');
templates.get(templateName, options)
.then(renderer)
.then(id => {
res.send({id: id});
res.end();
})
.catch((err) => {
console.error('Error:', err, 'for', req.url);
res.sendStatus(500).end(err);
});
});
});
app.options('/api/pdf/:id');

63
server/renderer.js
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@@ -5,48 +5,47 @@ const uuid = require('uuid');
const {getDirPath, getDocPath} = require('./utils');
function copyToTemp(id, texDocument, callback) {
const dirPath = getDirPath(id);
function copyToTemp(id, texDocument) {
return new Promise((resolve, reject) => {
const dirPath = getDirPath(id);
fs.mkdir(dirPath, (err) => {
if (err) {
callback(err);
return;
}
const docPath = getDocPath(id);
fs.writeFile(docPath, texDocument, (err) => {
fs.mkdir(dirPath, (err) => {
if (err) {
callback(err);
reject(err);
return;
}
callback(null);
const docPath = getDocPath(id);
fs.writeFile(docPath, texDocument, (err) => {
if (err) {
reject(err);
}
resolve(id);
});
});
});
}
function generateDoc(id, callback) {
const pdflatex = spawn('pdflatex', [getDocPath(id), '-interaction', 'nonstopmode'], {cwd: getDirPath(id)});
pdflatex.stderr.on('data', (data) => {
console.error('onData', data);
});
function generateDoc(id) {
return new Promise((resolve, reject) => {
const pdflatex = spawn('pdflatex', ['-interaction', 'nonstopmode', getDocPath(id)], {cwd: getDirPath(id)});
pdflatex.stderr.on('data', (data) => {
console.error('onData', data);
});
pdflatex.on('close', (code) => {
if (code > 0) {
callback(`pdflatex returned with code ${code}`);
return;
}
console.log(`PDF ${id} generated`);
callback(null, id);
pdflatex.on('close', (code) => {
if (code > 0) {
reject(`pdflatex returned with code ${code}`);
return;
}
console.log(`PDF ${id} generated`);
resolve(id);
});
});
}
module.exports = (texDocument, callback) => {
module.exports = function(texDocument, callback) {
const id = uuid.v1();
copyToTemp(id, texDocument, (err) => {
if (err) {
callback(err);
return;
}
generateDoc(id, callback);
});
return copyToTemp(id, texDocument)
.then(generateDoc);
};

20
server/templates.js
View File

@@ -1,13 +1,13 @@
const path = require('path');
module.exports.get = (templateName, options, callback) => {
const modulePath = path.join(__dirname, 'templates', templateName);
let template;
try {
template = require(modulePath);
callback(null, template(options));
} catch (e) {
callback(`${templateName} not found!`);
}
module.exports.get = function(templateName, options) {
return new Promise((resolve, reject) => {
const modulePath = path.join(__dirname, 'templates', templateName);
try {
const template = require(modulePath);
resolve(template(options));
} catch (e) {
reject(`${templateName} not found!`);
}
});
};