API Request returns 400 error - Render cycle detected

Lukerayn3r

Hi I am trying to make an API request to one of my reports. Whenever I make the request I receive the following error

message: Render cycle detected. Template at /Intelli-Sense/Geo-Sense/Monthly/Headline/template was rendered previously in this render request (hierarchy: /Intelli-Sense/Geo-Sense/Monthly/Headline/template -> /Intelli-Sense/Geo-Sense/Monthly/Headline/template). Please verify that reporter.render is not causing cycle

stack: Error: Render cycle detected. Template at /Intelli-Sense/Geo-Sense/Monthly/Headline/template was rendered previously in this render request (hierarchy: /Intelli-Sense/Geo-Sense/Monthly/Headline/template -> /Intelli-Sense/Geo-Sense/Monthly/Headline/template). Please verify that reporter.render is not causing cycle    at Object.callbackRequests.(anonymous function) (/var/www/html/jsreportapp/node_modules/script-manager/lib/worker-servers.js:250:31)    at process.<anonymous> (/var/www/html/jsreportapp/node_modules/script-manager/lib/worker-servers.js:195:30)    at process.emit (events.js:198:15)    at process.EventEmitter.emit (domain.js:481:20)    at emit (internal/child_process.js:848:12)    at processTicksAndRejections (internal/process/task_queues.js:81:17)

When I make the API call before the POST request is made an OPTIONS request is made which returns 204 not sure if this helps.

Here is the code I wrote to use the API

$('#headline_report_now_btn').click(function() {
    var request = new XMLHttpRequest();
    request.open('POST', 'https://{url}/api/report', true);
    request.setRequestHeader('Content-Type', 'application/json');
    request.setRequestHeader('Authorization', 'Basic {token}');
    request.responseType = 'blob';

    request.send(JSON.stringify({
        "template": {
            "shortid": "H1xtsYmyWI"
        },
        "data": {
            "user_id": "{{ current_user['id'] }}",
        }
    }));

    $('#confirmation_modal').modal('show');
});

Here is my script code

const jsreport = require('jsreport-proxy');
const axios = require('axios');

async function beforeRender(req, res) {
    if (req.context.isChildRequest) {
      return
    }

    var user_id;
    if(req.data.user_id > 0) {
        user_id = req.data.user_id;
    }
    else {
        user_id = 'null';
    }

    var nodemailer = require("nodemailer");
    var sesTransport = require('nodemailer-ses-transport');

    var transporter = nodemailer.createTransport(sesTransport({
        accessKeyId: "{token}",
        secretAccessKey: "{token}",
        region: 'eu-west-1',
        rateLimit: 5
    }));

    // Perform an API request to get the JWT token needed to verify future requests
    const API_LOGIN = await axios.get({url}, {
        headers: {
            'Authorization': 'Bearer {token}'
        }
    });

    // Perform an API request to get all the veue data needed for the reports
    const API_VENUES_DATA = await axios.get({url} + user_id, {
        headers: {
            'Authorization': 'Bearer ' + API_LOGIN.data.JWT
        }
    });

    for (let venue of API_VENUES_DATA.data) {        
        const result = await jsreport.render({ 
            template: { 
                shortid: 'H1xtsYmyWI'
            },
            data: venue
        });

        // Upload and email the report
        var fileName = venue.name + '_report_' + Date.now() + '.pdf'
        fileName = fileName.replace(/ /g,"_");

        sendEmail(fileName, transporter, venue.emails, result);
    }

    async function sendEmail(fileName, transporter, emails, result) {
        emails.forEach(function(email) {
            var mail = {
                from: "{email}",
                to: email,
                subject: "{subject}",
                text: "See the attached report",
                html: `{text}`,
                attachments: [
                {  
                    filename: fileName,
                    content: result.content
                }],
            }

            transporter.sendMail(mail, function(error, response){
                transporter.close();
                if(error){
                    return done(error);
                }
            });
        });
    }
}

Thanks for any help in advance

Lukerayn3r

Same error is happening when I try and run the report from jsreport

Error: Render cycle detected. Template at /Intelli-Sense/Geo-Sense/Monthly/Headline/template was rendered previously in this render request (hierarchy: /Intelli-Sense/Geo-Sense/Monthly/Headline/template -> /Intelli-Sense/Geo-Sense/Monthly/Headline/template). Please verify that reporter.render is not causing cycle
    at Object.callbackRequests.(anonymous function) (/var/www/html/jsreportapp/node_modules/script-manager/lib/worker-servers.js:250:31)
    at process.<anonymous> (/var/www/html/jsreportapp/node_modules/script-manager/lib/worker-servers.js:195:30)
    at process.emit (events.js:198:15)
    at process.EventEmitter.emit (domain.js:481:20)
    at emit (internal/child_process.js:848:12)
    at processTicksAndRejections (internal/process/task_queues.js:81:17)

Lukerayn3r

I recently switched servers and had to re-download everything, I rememeber having to alter some code which allowed me to do multiple render cycles. Could you let me know where this piece of code is located? :)

Lukerayn3r

I managed to fix it, I had to change this code - https://github.com/jsreport/jsreport-templates/commit/4e86708087bd07e771a06d5a213e00923be77969

jan_blaha

Hi,

would you be able to modify this example so it replicates your error?
I think it is similar to yours but I can't make it failing on loop error.
https://playground.jsreport.net/w/anon/bFBeNeuV

We would love to fix this if its an actual issue.
Thank you

Lukerayn3r

I think I must be using an older version, this might have been fixed because for some reason I cant seem to replicate the error I was having either. I'll let you know if I do come across anything though.

Lukerayn3r

I managed to replicate the issue, it was my fault I believe. I was attached the script to the template so it was trying to render the template twice which then caused this issue. I can't think of a reason why I need to attached the script to the template either.

jan_blaha

Ah ok, that could cause it. Thank you for info.