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Server hangs on PDF generation
See original GitHub issueTrying to generate a PDF, this call never returns:
GET /api/method/frappe.utils.print_format.download_pdf?doctype=User&name=Administrator&format=Standard&no_letterhead=0&_lang=en
This sequence of commands, executed by the webserver, hangs it up:
import pdfkit
html = """
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta content="width=device-width, initial-scale=1.0" name="viewport" />
<title>Administrator</title>
<meta content="frappe" name="generator" />
<link href="http://localhost:8000/assets/css/printview.css" rel="stylesheet" type="text/css" />
<style>
@media screen {
.print-format-gutter {
background-color: #d1d8dd;
padding: 30px 0px;
}
.print-format {
background-color: white;
box-shadow: 0px 0px 9px rgba(0, 0, 0, 0.5);
max-width: 8.3in;
min-height: 11.69in;
padding: 0.75in;
margin: auto;
}
.print-format.landscape {
max-width: 11.69in;
padding: 0.2in;
}
.page-break {
padding: 30px 0px;
border-bottom: 1px dashed #888;
}
.page-break:first-child {
padding-top: 0px;
}
.page-break:last-child {
border-bottom: 0px;
}
/* mozilla hack for images in table */
body:last-child .print-format td img {
width: 100% !important;
}
@media(max-width: 767px) {
.print-format {
padding: 0.2in;
}
}
}
@media print {
.print-format p {
margin-left: 1px;
margin-right: 1px;
}
}
.disabled-check {
color: #eee;
}
.data-field {
margin-top: 5px;
margin-bottom: 5px;
}
.data-field .value {
word-wrap: break-word;
}
.important .value {
font-size: 120%;
font-weight: bold;
}
.important label {
line-height: 1.8;
margin: 0px;
}
.table {
margin: 20px 0px;
}
.square-image {
width: 100%;
height: 0;
padding: 50% 0;
background-size: contain;
/*background-size: cover;*/
background-repeat: no-repeat !important;
background-position: center center;
border-radius: 4px;
}
.print-item-image {
object-fit: contain;
}
.pdf-variables,
.pdf-variable,
.visible-pdf {
display: none !important;
}
.print-format {
font-size: 9pt;
font-family: "Helvetica Neue", Helvetica, Arial, "Open Sans", sans-serif;
-webkit-print-color-adjust: exact;
}
.page-break {
page-break-after: always;
}
.print-heading {
border-bottom: 1px solid #aaa;
margin-bottom: 10px;
}
.print-heading h2 {
margin: 0px;
}
.print-heading h4 {
margin-top: 5px;
}
table.no-border,
table.no-border td {
border: 0px;
}
.print-format label {
/* wkhtmltopdf breaks label into multiple lines when it is inline-block */
display: block;
}
.print-format img {
max-width: 100%;
}
.print-format table td>.primary:first-child {
font-weight: bold;
}
.print-format td,
.print-format th {
vertical-align: top !important;
padding: 6px !important;
}
.print-format p {
margin: 3px 0px 3px;
}
.print-format table td pre {
white-space: normal;
word-break: normal;
}
table td div {
/* needed to avoid partial cutting of text between page break in wkhtmltopdf */
page-break-inside: avoid !important;
}
/* hack for webkit specific browser */
@media (-webkit-min-device-pixel-ratio:0) {
thead,
tfoot {
display: table-header-group;
}
}
[document-status] {
margin-bottom: 5mm;
}
.signature-img {
background: #fff;
border-radius: 3px;
margin-top: 5px;
max-height: 150px;
}
.print-preview [data-fieldtype="Table"] {
overflow: auto;
}
.print-heading {
text-align: right;
text-transform: uppercase;
color: #666;
padding-bottom: 20px;
margin-bottom: 20px;
border-bottom: 1px solid #d1d8dd;
}
.print-heading h2 {
font-size: 24px;
}
.print-format th {
background-color: #eee !important;
border-bottom: 0px !important;
}
/* modern format: for-test */
</style>
</head>
<body>
<div class="print-format-gutter">
<div class="print-format">
<div class="page-break">
<div class="row section-break">
<div class="col-xs-12 column-break">
<div class="row data-field" data-fieldname="enabled" data-fieldtype="Check">
<div class="col-xs-9"><label>Enabled</label></div>
<div class="col-xs-3 text-right value"><i class="fa fa-check"></i></div>
</div>
</div>
</div>
<div class="row section-break">
<div class="col-xs-6 column-break">
<div class="row data-field" data-fieldname="email" data-fieldtype="Data">
<div class="col-xs-5"><label>Email</label></div>
<div class="col-xs-7 value">admin@example.com</div>
</div>
<div class="row data-field" data-fieldname="first_name" data-fieldtype="Data">
<div class="col-xs-5"><label>First Name</label></div>
<div class="col-xs-7 value">Administrator</div>
</div>
<div class="row data-field" data-fieldname="full_name" data-fieldtype="Data">
<div class="col-xs-5"><label>Full Name</label></div>
<div class="col-xs-7 value">Administrator</div>
</div>
<div class="row important data-field" data-fieldname="send_welcome_email"
data-fieldtype="Check">
<div class="col-xs-9"><label>Send Welcome Email</label></div>
<div class="col-xs-3 text-right value"><i class="fa fa-check"></i></div>
</div>
<div class="row data-field" data-fieldname="unsubscribed" data-fieldtype="Check">
<div class="col-xs-9"></div>
<div class="col-xs-3 text-right value"><i
class="{{undefined value printed: the inline if-expression on line 127 in 'templates/print_formats/standard_macros.html' evaluated to false and no else section was defined.}}"></i>
</div>
</div>
</div>
<div class="col-xs-6 column-break">
<div class="row data-field" data-fieldname="username" data-fieldtype="Data">
<div class="col-xs-5"><label>Username</label></div>
<div class="col-xs-7 value">administrator</div>
</div>
</div>
</div>
<div class="row section-break">
<div class="col-xs-6 column-break"> </div>
<div class="col-xs-6 column-break">
<div class="row data-field" data-fieldname="mute_sounds" data-fieldtype="Check">
<div class="col-xs-9"></div>
<div class="col-xs-3 text-right value"><i
class="{{undefined value printed: the inline if-expression on line 127 in 'templates/print_formats/standard_macros.html' evaluated to false and no else section was defined.}}"></i>
</div>
</div>
</div>
</div>
<div class="row section-break">
<div class="col-xs-12 column-break">
<div class="row data-field" data-fieldname="logout_all_sessions" data-fieldtype="Check">
<div class="col-xs-9"></div>
<div class="col-xs-3 text-right value"><i
class="{{undefined value printed: the inline if-expression on line 127 in 'templates/print_formats/standard_macros.html' evaluated to false and no else section was defined.}}"></i>
</div>
</div>
</div>
</div>
<div class="row section-break">
<div class="col-xs-12 column-break">
<div class="row data-field" data-fieldname="document_follow_notify" data-fieldtype="Check">
<div class="col-xs-9"></div>
<div class="col-xs-3 text-right value"><i
class="{{undefined value printed: the inline if-expression on line 127 in 'templates/print_formats/standard_macros.html' evaluated to false and no else section was defined.}}"></i>
</div>
</div>
<div class="row data-field" data-fieldname="document_follow_frequency" data-fieldtype="Select">
<div class="col-xs-5"><label>Frequency</label></div>
<div class="col-xs-7 value">Daily</div>
</div>
</div>
</div>
<div class="row section-break">
<div class="col-xs-12 column-break">
<div class="row data-field" data-fieldname="thread_notify" data-fieldtype="Check">
<div class="col-xs-9"></div>
<div class="col-xs-3 text-right value"><i
class="{{undefined value printed: the inline if-expression on line 127 in 'templates/print_formats/standard_macros.html' evaluated to false and no else section was defined.}}"></i>
</div>
</div>
<div class="row data-field" data-fieldname="send_me_a_copy" data-fieldtype="Check">
<div class="col-xs-9"></div>
<div class="col-xs-3 text-right value"><i
class="{{undefined value printed: the inline if-expression on line 127 in 'templates/print_formats/standard_macros.html' evaluated to false and no else section was defined.}}"></i>
</div>
</div>
<div class="row data-field" data-fieldname="allowed_in_mentions" data-fieldtype="Check">
<div class="col-xs-9"><label>Allowed In Mentions</label></div>
<div class="col-xs-3 text-right value"><i class="fa fa-check"></i></div>
</div>
</div>
</div>
<div class="row section-break">
<div class="col-xs-6 column-break">
<div class="row data-field" data-fieldname="simultaneous_sessions" data-fieldtype="Int">
<div class="col-xs-5"><label>Simultaneous Sessions</label></div>
<div class="col-xs-7 text-right value">1</div>
</div>
<div class="row data-field" data-fieldname="user_type" data-fieldtype="Select">
<div class="col-xs-5"><label>User Type</label></div>
<div class="col-xs-7 value">System User</div>
</div>
<div class="row data-field" data-fieldname="login_after" data-fieldtype="Int">
<div class="col-xs-5"><label>Login After</label></div>
<div class="col-xs-7 text-right value">0</div>
</div>
<div class="row data-field" data-fieldname="login_before" data-fieldtype="Int">
<div class="col-xs-5"><label>Login Before</label></div>
<div class="col-xs-7 text-right value">0</div>
</div>
<div class="row data-field" data-fieldname="bypass_restrict_ip_check_if_2fa_enabled"
data-fieldtype="Check">
<div class="col-xs-9"></div>
<div class="col-xs-3 text-right value"><i
class="{{undefined value printed: the inline if-expression on line 127 in 'templates/print_formats/standard_macros.html' evaluated to false and no else section was defined.}}"></i>
</div>
</div>
</div>
<div class="col-xs-6 column-break">
<div class="row data-field" data-fieldname="last_login" data-fieldtype="Read Only">
<div class="col-xs-5"><label>Last Login</label></div>
<div class="col-xs-7 value">2020-10-15 14:02:42.473169</div>
</div>
<div class="row data-field" data-fieldname="last_ip" data-fieldtype="Read Only">
<div class="col-xs-5"><label>Last IP</label></div>
<div class="col-xs-7 value">127.0.0.1</div>
</div>
<div class="row data-field" data-fieldname="last_active" data-fieldtype="Datetime">
<div class="col-xs-5"><label>Last Active</label></div>
<div class="col-xs-7 value">15-10-2020 16:10:04</div>
</div>
<div data-fieldname="last_known_versions" data-fieldtype="Text" style="padding: 10px 0px">
<label>Last Known Versions</label>{"frappe":{"title": "Frappe Framework", "description":
"Full stack web framework with Python, Javascript, MariaDB, Redis, Node", "branch":
"version-12", "version": "12.10.2"}, "erpnext":{"title": "ERPNext", "description": "ERP made
simple", "branch": "version-12", "version": "12.12.1"}}</div>
</div>
</div>
<div class="row section-break">
<div class="col-xs-6 column-break"> </div>
<div class="col-xs-6 column-break"> </div>
</div>
</div>
</div>
</div>
<script>document.addEventListener('DOMContentLoaded', () => { const page_div = document.querySelector('.page-break'); page_div.style.display = 'flex'; page_div.style.flexDirection = 'column'; const footer_html = document.getElementById('footer-html'); footer_html.classList.add('hidden-pdf'); footer_html.classList.remove('visible-pdf'); footer_html.style.order = 1; footer_html.style.marginTop = '20px'; });</script>
</body>
</html>
"""
options = {
"print-media-type": None,
"background": None,
"images": None,
"quiet": None,
"encoding": "UTF-8",
"margin-right": "15mm",
"margin-left": "15mm",
"header-html": "/tmp/frappe-pdf-RANDOM_STRING.html",
"footer-html": "/tmp/frappe-pdf-RANDOM_STRING.html",
"cookie": [
[
"sid",
"MY_SID_HERE"
]
],
"page-size": "A4",
"disable-javascript": "",
"disable-local-file-access": "",
"disable-smart-shrinking": ""
}
filedata = pdfkit.from_string(html, False, options=options or {}) # this call never returns
After this, the server stops to answer any other requests.
Trying to reproduce the issue with the same inputs from above in bench console gives me this error:
filedata = pdfkit.from_string(html, False, options=options or {})
---------------------------------------------------------------------------
OSError Traceback (most recent call last)
~/frappe-bench-develop/apps/frappe/frappe/commands/utils.py in <module>
----> 1 filedata = pdfkit.from_string(html, False, options=options or {})
~/frappe-bench-develop/env/lib/python3.6/site-packages/pdfkit/api.py in from_string(input, output_path, options, toc, cover, css, configuration, cover_first)
70 configuration=configuration, cover_first=cover_first)
71
---> 72 return r.to_pdf(output_path)
73
74
~/frappe-bench-develop/env/lib/python3.6/site-packages/pdfkit/pdfkit.py in to_pdf(self, path)
154
155 if 'Error' in stderr:
--> 156 raise IOError('wkhtmltopdf reported an error:\n' + stderr)
157
158 if exit_code != 0:
OSError: wkhtmltopdf reported an error:
Exit with code 1 due to network error: HostNotFoundError
Wkhtmltopdf works, in priciple:
> bench console
In [1]: import pdfkit
In [2]: filedata = pdfkit.from_string('<h1>Test</h1>', False)
Loading pages (1/6)
Counting pages (2/6)
Resolving links (4/6)
Loading headers and footers (5/6)
Printing pages (6/6)
Done
Environment
Development setup, bench started via bench start.
> bench --version
5.0.0
> bench version
erpnext 12.12.1
frappe 12.10.2
> wkhtmltopdf --version
wkhtmltopdf 0.12.5 (with patched qt)
> lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Codename: bionic
Seems to be something wrong with my setup. Any hints what it could be?
Issue Analytics
- State:
- Created 3 years ago
- Comments:7 (2 by maintainers)
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@barredterra Also, is it possible that you’re running a single threaded web server? I could replicate this by setting
in https://github.com/frappe/frappe/blob/develop/frappe/app.py#L272
Also, If the PDF generation works after removing
from printview.html (and maybe other assets), (you’ll get an unstyled print though) then single threaded server is the problem.
Ok, maybe not a minute for rendering. This is the time taken for the initial response in one of the formats (49 pages) on a very high performance production server:
Perhaps this could be configurable or should raise an error immediately if single threaded can never work…