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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" class='height100'>
<head>
<meta charset="UTF-8">
<title>Server installation</title>
<!-- Google font:, also related: -->
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<style type='text/css'>
.note{
color: #666;
}
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font-family: 'Lato', sans-serif;
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</head>
<body>
<div id='toc'>
<!-- this TOC will be populated later with all H1,2,3 found in this document.
See javascript code at the page bottom.
Everything you write here will be overridden -->
</div>
<p style='font-weight:bold;font-size:200%'>eGSIM deployment (Django and wsgi)</p>
<p>
The following cheatsheet covers two main aspect: Maintenance and Deployment.
It assumes that you already have access to a remote
machine. The following instructions have been tested on Ubuntu 18.04 MATE.
The procedure to obtain or update an SSL certificate (in order to have
a http<b>s</b> address) is not covered here
</p>
<p>
Set the following variables to see meaningful paths (the document will update
automatically):
</p>
<table>
<tr>
<td>
<input type='text' id='DOMAIN' /> <!-- see bottom of the page to set the startup var -->
</td>
<td>
The domain name of the computer, i.e. the internet address it is assigned to,
e.g.: rz-vm183d.gfz-potsdam.de, www.example.com
</td>
</tr>
<tr>
<td>
<input type='text' id='DJANGO_PROJECT' />
</td>
<td>
The eGSIM Django project name where all Python packages will be placed
(including the eGSIM git repository) <b>usually egsim followed by some numeric version,
but note that this also is the name of the Gunicorn
service file, so please provide only alphanumeric or underscore characters</b>
</td>
</tr>
<tr>
<td>
<input type='text' id='DJANGO_USER' />
</td>
<td>
The Django user (can be the same as <code>$DJANGO_PROJECT</code>)
</td>
</tr>
<tr>
<td>
<input type='text' id='PYTHON_VERSION' />
</td>
<td>
the Python version of the virtual environment (major.medium or major.medium.minor).
The relative Python virtual environment should be created by convention
under $VENV_PATH
(see below)
</td>
</tr>
</table>
<h1>Maintenance</h1>
This section covers information for an already installed program. To perform a
server installation, scroll down
<h2>Important files</h2>
<table>
<tr>
<td><i class="fa fa-folder-o"></i></td>
<td><span class="token important">$EGSIM_CWD</span><br>
where the cloned eGSIM project and (usually) the Python virtual environment resides.
This is the place to go to perform <code>git</code> operations and
activate the virtual environment</td>
</tr>
<tr>
<td><i class="fa fa-folder-o"></i></td>
<td><span class="token important">$VENV_PATH</span><br>
The Python path (virtual environment)</td>
</tr>
<tr>
<td><i class="fa fa-file-o"></i></td>
<td><span class="token important">$EGSIM_CONFIG_DIR/settings.py</span><br>
the settings, keep confidential, root access needed</td>
</tr>
<tr>
<td><i class="fa fa-file-o"></i></td>
<td><span class="token important">/etc/systemd/system/$DJANGO_PROJECT.service</span><br>
the Gunicorn script to start the django production server</td>
</tr>
<tr>
<td><i class="fa fa-file-o"></i></td>
<td><span class="token important">$EGSIM_LOG_DIR/gunicorn.log</span><br>
inspects the django server log<br>
Example: sudo tail -30 $EGSIM_LOG_DIR/gunicorn.log</td>
</tr>
<tr>
<td><i class="fa fa-file-o"></i></td>
<td><span class="token important">/etc/nginx/sites-available/$DJANGO_PROJECT</span><br>
the nginx config for the egsim site</td>
</tr>
<tr>
<td><i class="fa fa-file-o"></i></td>
<td><span class="token important">/var/log/nginx/access.log</span><br>
inspects the nginx log (access info).<br>
Example: sudo tail -30 /var/log/nginx/access.log</td>
</tr>
<tr>
<td><i class="fa fa-file-o"></i></td>
<td><span class="token important">/var/log/nginx/error.log</span><br>
inspects the nginx log (error info)<br>
Example: sudo tail -30 /var/log/nginx/error.log</td>
</tr>
<tr>
<td><i class="fa fa-file-o"></i></td>
<td><span class="token important">/etc/nginx/sites-available/default</span><br>
the default nginx config. It should be the "fallback" when all
other configs are not used. We saved the original not-modified config
in <code>default.backup</code> in the same directory
</td>
</tr>
<tr>
<td><i class="fa fa-file-o"></i></td>
<td><span class="token important">/etc/nginx/nginx.conf</span><br>
the main nginx configuration (should not be modified frequently
and only in rare cases)
</td>
</tr>
<tr>
<td><i class="fa fa-file-o"></i></td>
<td><span class="token important">/etc/hosts</span><br>
where the matching hosts are written: should not be modified
frequently, we did it only once to add the domain name
(line "127.0.0.1 $DOMAIN", without quotes)
</td>
</tr>
</table>
<h2>Common operations</h2>
<h3>Update the package</h3>
<b>Warning: this assumes there are: NO changes to
(=migrations to be performed on) the eGSIM database, NO Python libraries
to be updated or newly installed, NO static files
(e.g., images, css, javascript) to be updated</b>
<p>Inside $EGSIM_CWD, as root user:</p>
<pre><code class="language-bash">
(cd $EGSIM_CWD && git pull)
service $DJANGO_PROJECT restart
service nginx restart
</code></pre>
<h3>Update the package and the static files</h3>
<b>Warning: this assumes there are: NO changes to
(=migrations to be performed on) the eGSIM database, NO Python libraries
to be updated or newly installed</b>
<p>Same as above but we need to run Django collectstatic in the activated virtualenv</p>
<pre><code class="language-bash">
source $VENV_ACTIVATE
(cd $EGSIM_CWD && git pull)
(cd $EGSIM_CWD; export PYTHONPATH=$EGSIM_CONFIG_DIR DJANGO_SETTINGS_MODULE=settings; python manage.py collectstatic)
service $DJANGO_PROJECT restart
service nginx restart
deactivate
</code></pre>
<h3>Update the db schema</h3>
This assumes that we created a new migration file with Django `makemigration`.
Note: we usually just throw away the old migrations and re-create a new migration file, usually
`api/migrations/0001_initial.py` or something similar. this means that we also delete
the old database for safety.
<p>IMPORTANT: Execute these command as <code>$DJANGO_USER</code>, thus FIRST type:</p>
<pre><code class="language-bash">
su $DJANGO_USER
</code></pre>
<b>You probably need to re-activate the Python virtual env</b>:
<pre><code class="language-bash">
source $VENV_ACTIVATE
</code></pre>
Now update the package,
remove the db (see note above),
(re)create the database (`migrate`) and populate it with eGSIM data (`egsim_init`):
<pre><code class="language-bash">
(cd $EGSIM_CWD && git pull)
rm $EGSIM_DATA_DIR/egsim.db
(cd $EGSIM_CWD; export PYTHONPATH=$EGSIM_CONFIG_DIR DJANGO_SETTINGS_MODULE=settings; python manage.py migrate)
(cd $EGSIM_CWD; export PYTHONPATH=$EGSIM_CONFIG_DIR DJANGO_SETTINGS_MODULE=settings; python manage.py egsim_init)
service $DJANGO_PROJECT restart
service nginx restart
</code></pre>
<h3>Install system fonts (to produce and download the same plots visible on the browser)</h3>
See snippet below (change the font name and the URL in case. The font directory "egsim" should be
already created, otherwise create it with the name you wish):
<pre><code class="language-bash">
cd /usr/share/fonts
mkdir egsim
cd egsim
wget "https://fonts.google.com/download?family=Encode%20Sans%20Semi%20Condensed" -O ./Encode_Sans_Semi_Condensed.zip
unzip -d . ./Encode_Sans_Semi_Condensed.zip
sudo chmod -R --reference=/usr/share/fonts/opentype /usr/share/fonts/egsim
fc-cache -fv
# check if font is installed:
fc-match EncodeSansSemiCondensed
</code></pre>
More details <a target="_blank" href="https://gist.github.com/lightonphiri/5811226a1fba0b3df3be73ff2d5b351c">here (opens in new tab)</a>
<p></p>
To check the font name, type <code>fc-list</code>
(optionally with <code>grep</code>) and check the font name which is
displayed after the first colon ":". E.g.:
<pre><code class="language-bash">
fc-list | grep Encode
</code></pre>
More details <a target="_blank" href="https://unix.stackexchange.com/a/305934">here (opens in new tab)</a>
<h1>Server installation</h1>
<h2>System requirements</h2>
Update and upgrade
<pre><code class="language-bash">
sudo apt-get update && sudo apt-get upgrade
</code></pre>
<p>Install required libraries</p>
<pre><code class="language-bash">
apt install git nginx-light curl libhdf5-dev gcc python3-rtree
</code></pre>
<p class='note'>
(libhdf5-dev gcc required by openquake,
see below. python3-rtree required by gmpe-smtk, see below)
</p>
<p>Optional installations</p>
<pre><code class="language-bash">
apt install vim
</code></pre>
<p>Install Python desired version</p>
Add repository (one time operation):
<pre><code class="language-bash">
sudo add-apt-repository ppa:deadsnakes/ppa
</code></pre>
Install your Python desired version
<b>Please check that
the value of the <input> component on top of this document is a correct Python version
(e.g. "3.11.2" or "3.10") before running the commands below</b>
<pre><code class="language-bash">
sudo apt-get update
sudo apt-get install $CURRENT_PYTHON $CURRENT_PYTHON-dev $CURRENT_PYTHON-distutils $CURRENT_PYTHON-venv
</code></pre>
<details>
<summary>Add Django user if not present yet (click for details)</summary>
[UPDATE 3/2023]: If you keep the same user as previous versions, skip this section
<pre><code class="language-bash">
adduser --system --home=$EGSIM_DATA_DIR --no-create-home --disabled-password --group --shell=/bin/bash $DJANGO_USER
</code></pre>
Optional: to configure $DJANGO_USER terminal sessions
(e.g. colors, completion, history, command aliases):
copy the root bashrc into $DJANGO_USER, i.e. typing as root:
<code>cp $HOME/.bashrc /var/opt/$DJANGO_USER/.bashrc</code>
(where <code>/var/opt/$DJANGO_USER</code> is supposed to be the $HOME variable of
$DJANGO_USER: in case of doubts: <code>su $DJANGO_USER</code> and <code>echo $HOME</code>)
</details>
<p>Final note: as always, proceed installing
Python packages being aware that in case of problems, the solution after googling is to
<code>apt-get install</code> missing packages. For instance, in case of Python 3.9
installation we had to:
<code>sudo apt-get install gfortran libopenblas-dev liblapack-dev libfreetype6-dev libgeos-dev</code>
<h2>Program requirements</h2>
<p>Create project folder</p>
<pre><code class="language-bash">
cd /opt
mkdir $DJANGO_PROJECT
cd $DJANGO_PROJECT
</code></pre>
<p>Clone package(s)</p>
eGSIM:
<pre><code class="language-bash">
git clone https://github.com/rizac/eGSIM.git
</code></pre>
Check that the path of eGSIM repository is: $EGSIM_CWD
<p>Create the virtual environment</p>
[UPDATE 10/2021] IMPORTANT: you need to have python-venv installed
(e.g. <code>apt-get install $CURRENT_PYTHON-venv</code>, see above).
<p>Installation</p>
<pre><code class="language-bash">
$CURRENT_PYTHON -m venv $VENV_PATH
</code></pre>
<p>Activation</p>
<pre><code class="language-bash">
source $VENV_ACTIVATE
</code></pre>
<p><b>IMPORTANT: from now on, every Python-related operation must be performed
within your activated virtual env</b></p>
<p>Check correct path: activate virtualenv and type</p>
<pre><code class="language-bash">
which python
python --version
</code></pre>
<p>the Python path should refer to the newly installed Python in the current
virtual environment (Python version should be 3.7+)</p>
<b>We assume hereafter that you are in $DJANGO_PROJECT</b>
<p>Install the repositories</p>
<p class='note'>For any error in any of the 'pip install' commands below,
the most likely cause is some system package missing: we suggest to google the
error first, then check if anybody suggests to <code>apt install</code>
missing packages and follow the instructions. <b>Ignore at first complicated
suggestions, they are rarely the solution to your problem</b>.
This doc was created precisely following the pattern above.
Eventually, we added in the apt-install command above all packages that we
discovered missing, so hopefully a fresh new installation might work fine
without any new error</p>
<p>Install eGSIM + required packages: activate virtualenv, then</p>
<pre><code class="language-bash">
cd ./eGSIM/
pip install --upgrade pip setuptools && pip install -r ./requirements.txt && pip install gunicorn
</code></pre>
<h2>Create project structure</h2>
<p>Data directory with correct ownership</p>
<pre><code class="language-bash">
mkdir $EGSIM_DATA_DIR
chown $DJANGO_USER $EGSIM_DATA_DIR
</code></pre>
<p>Log directory with correct ownership</p>
<pre><code class="language-bash">
mkdir $EGSIM_LOG_DIR
chown $DJANGO_USER $EGSIM_LOG_DIR
</code></pre>
<p>Config directory. Change group ownership (with the flag --group added to the command adduser
above we created a group with the same name as $DJANGO_USER).
Change also permissions (750 means the current user, i.e. root, can read, write,
and execute while the group and others cannot write)</p>
<pre><code class="language-bash">
mkdir $EGSIM_CONFIG_DIR
chgrp $DJANGO_USER $EGSIM_CONFIG_DIR
chmod 750 $EGSIM_CONFIG_DIR
</code></pre>
<h2>Set up the project</h2>
<p>Create the settings file:
Create (or copy from a previous deployment file):
<p><code>$EGSIM_CONFIG_DIR/settings.py</code></p>
For reference, see the template below, which is automatically
filled according to the variables set in this page:
<pre><code class="language-python">
"""
Django settings for eGSIM project.
Copied from https://djangodeployment.com/wp-content/uploads/2017/03/Django-deployment-cheatsheet.pdf
This file should be copied from previous deployments and modified accordingly
Listed below are the Django variables that are most likely to be edited. Note that this module
inherits from the debug settings under the egsim git repository
"""
from egsim.settings_debug import *
DEBUG = False # DO NOT CHANGE THIS!
ALLOWED_HOSTS = ['$DOMAIN']
# SECRET_KEY SHOULD BE UNIQUE FOR EACH SETTINGS FILE AND CAN BE GENERATED ON THE TERMINAL (WITHIN THE DJANGO VIRTUAL ENV) WITH THE COMMAND:
# python -c "from django.core.management.utils import get_random_secret_key;print(get_random_secret_key())"
# COPY THE OUTPUT STRING HERE BELOW
SECRET_KEY = ''
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.sqlite3',
'NAME': '$EGSIM_DATA_DIR/egsim.db',
}
}
# static files root (path on the server)
STATIC_ROOT = '/var/cache/$DJANGO_PROJECT/static/'
# static files url (already set in settings debug, here for ref.):
# STATIC_URL = '/static/'
# media root (path on the server):
MEDIA_ROOT = '$EGSIM_DATA_DIR/media/'
# static files url (already set in settings debug, here for ref.):
# MEDIA_URL = '/media/'
CSRF_TRUSTED_ORIGINS = ["https://$DOMAIN"] # required in Django 4+. Https or http depends on your SSL certificate
</code></pre>
Then, inside $EGSIM_CWD:
<p>Run collectstatic: copy static files to the new location.
Activate virtualenv and:</p>
<pre><code class="language-bash">
(cd $EGSIM_CWD; export PYTHONPATH=$EGSIM_CONFIG_DIR DJANGO_SETTINGS_MODULE=settings; python manage.py collectstatic)
</code></pre>
<p class='note'>(the PYTHONPATH simply makes the option
<code>--settings=settings</code> to point to the newly created settings.py).
You should see a message like: '175 static files copied to
'/var/cache/$DJANGO_PROJECT/static'
(the number of files might be huge but there are also Django css and so on
</p>
<p>Migration and data initialization scripts</p>
<p>IMPORTANT: Execute these command as <code>$DJANGO_USER</code>, thus FIRST type:</p>
<pre><code class="language-bash">
su $DJANGO_USER
</code></pre>
<b>You probably need to re-activate the Python virtual env</b>:
<pre><code class="language-bash">
source $VENV_ACTIVATE
</code></pre>
With the Python virtualenv activated, execute:
<p>Django migration</p>
<pre><code class="language-bash">
(cd $EGSIM_CWD; export PYTHONPATH=$EGSIM_CONFIG_DIR DJANGO_SETTINGS_MODULE=settings; python manage.py migrate)
<!--export PYTHONPATH=$EGSIM_CONFIG_DIR/;export DJANGO_SETTINGS_MODULE=settings;python manage.py migrate-->
</code></pre>
<p>Initialize our database (OpenQuake GSIMs IMTs and TRTs)</p>
<pre><code class="language-bash">
(cd $EGSIM_CWD; export PYTHONPATH=$EGSIM_CONFIG_DIR DJANGO_SETTINGS_MODULE=settings; python manage.py egsim_init)
<!--export PYTHONPATH=$EGSIM_CONFIG_DIR; export DJANGO_SETTINGS_MODULE=settings;python manage.py egsim_init-->
</code></pre>
<h2>Server configuration</h2>
<p>NGINX is the main application server, however, it delegates Gunicorn for
serving the Python code (everything except static and media files).</p>
In the following, we will configure Gunicorn and Nginx.
<p>IMPORTANT: <b>remember that After any modification to the code or the config below,
before checking the results online, is better to restart the services</b></p>
<pre><code class="language-bash">
service $DJANGO_PROJECT restart
service nginx restart
</code></pre>
<h3>Gunicorn</h3>
<p>
(become root <code class="language-bash">su root</code> and <b>(re)activate virtualenv if necessary</b>)
</p>
Check that gunicorn is installed, i.e. the file <code>$VENV_PATH/bin/gunicorn</code> exists
(otherwise <code>pip install gunicorn</code>)
<details>
<summary>
Start Gunicorn and go to $DOMAIN (from the server or another external computer)
to test:
</summary>
<pre><code class="language-bash">
export PYTHONPATH=$EGSIM_CONFIG_DIR; export DJANGO_SETTINGS_MODULE=settings
gunicorn --workers=4 --log-file=$EGSIM_LOG_DIR/gunicorn.log --bind=127.0.0.1:$GUNICORN_PORT --bind=[::1]:$GUNICORN_PORT egsim.wsgi:application
</code></pre>
<!-- <p>Create the systemd task to start automatically egsim django server</p>
<pre><code class="language-bash">
su $DJANGO_USER
</code></pre> -->
</details>
<p>
Create the so-called service <i>unit file</i> (<code>touch</code> or
<code>cp</code> from a previous unit file, if available.
<i>Remember: not dots in the file name</i>):
</p>
<pre><code class="language-bash">/etc/systemd/system/$DJANGO_PROJECT.service</code></pre>
<p>
with the following content:
</p>
<pre><code class="language-bash">
[Unit]
Description=$DJANGO_PROJECT
[Service]
User=$DJANGO_USER
Group=$DJANGO_USER
Environment="PYTHONPATH=$EGSIM_CONFIG_DIR:$VENV_PATH"
Environment="DJANGO_SETTINGS_MODULE=settings"
WorkingDirectory=$EGSIM_CWD
ExecStart=$VENV_PATH/bin/gunicorn \
--workers=4 \
--log-file=$EGSIM_LOG_DIR/gunicorn.log \
--bind=127.0.0.1:$GUNICORN_PORT --bind=[::1]:$GUNICORN_PORT \
egsim.wsgi:application
[Install]
WantedBy=multi-user.target
</code></pre>
<b>Important notes:</b>
<ul>
<li>--bind argument: it is typed twice to
bind our Django application on localhost both on ipv6 and ipv4 interfaces.
We will then tell Nginx (see below) to proxy each request to localhost
(see <code>proxy_pass</code> argument) delegating Gunicorn for everything that is not a
static file (everything not in media or static directories)
<li>The URL port of the <code>--bind</code> arguments is set as
<input type='number' step="1" id='GUNICORN_PORT' style="width:6rem"/>, you can change
the value in the field to automatically update the templates below. Changing the port
is useful if you want to run several Gunicorn instances from Nginx (e.g., previous
versions alongside the current)
</ul>
<p>Stop all running egsim services</p>
List all running services via:
<pre><code class="language-bash">
systemctl list-units --type=service --state=running
</code></pre>
And then, after identifying the old egsim service:
<pre><code class="language-bash">
service [old_egsim_unit_file] stop
</code></pre>
</p>
<p><b>Important note</b> without this procedure, if the old service is using the same url
and port specified in the unit file above, then our service will not work, as the port is
already in use
</p>
<p>Restart the service</p>
<pre><code class="language-bash">
service $DJANGO_PROJECT stop
systemctl daemon-reload
service $DJANGO_PROJECT start
</code></pre>
<p>Check the status of the service</p>
<pre><code class="language-bash">
sudo systemctl status $DJANGO_PROJECT
</code></pre>
<details>
<summary>command details</summary>
The usual way to restart the service:
<pre><code class="language-bash">
service $DJANGO_PROJECT restart
</code></pre>
works if the service file has not been changed. so for safety we
instruct systemd to reload its configuration files, including unit files and security
profiles, without restarting the system or services (the command is essential after making
changes to any unit file to ensure systemd applies the updates correctly)
</details>
<p>
<details>
<summary>To start the service automatically on boot:</summary>
<pre><code class="language-bash">
systemctl enable $DJANGO_PROJECT
</code></pre>
</details>
</p>
<h3>NGINX</h3>
<p>
(become root <code class="language-bash">su root</code> and <b>(re)activate virtualenv if necessary</b>)
</p>
<p>
Create the config file (<code>touch</code> or
<code>cp</code> from a previous config file, if available):
</p>
<pre><code class="language-bash">
/etc/nginx/sites-available/$DJANGO_PROJECT
</code></pre>
<p>
with the following content (checking <code>proxy_pass</code>, see notes below):
</p>
<pre><code class="language-nginx">
server {
listen 80;
listen [::]:80;
server_name $DOMAIN www.$DOMAIN;
location / {
proxy_pass http://localhost:$GUNICORN_PORT;
}
location /static/ {
alias /var/cache/$DJANGO_PROJECT/static/;
}
location /media/ {
alias $EGSIM_DATA_DIR/media/;
}
}
</code></pre>
<b>Important notes:</b>
<ul>
<li>The line <code>proxy_pass http://localhost:$GUNICORN_PORT;</code>
is the line that forwards to Gunicorn all locations starting with '/' and not
matching '/static/' or '/media/'. As such, <code>proxy_pass</code> must point to the Gunicorn
URL just configured in the service unit file (see above)
</li>
</ul>
<p>Remove the previous egsim link (if present)</p>
<pre><code class="language-bash">
ls -l /etc/nginx/sites-enabled
# then rm ... the link pointing to the previous config
</code></pre>
<p>Create link in sites-enabled</p>
<pre><code class="language-bash">
cd /etc/nginx/sites-enabled
ln -s ../sites-available/$DJANGO_PROJECT .
</code></pre>
<p>
<details>
<summary>Add $DOMAIN to known hosts (one time operation)</summary>
<b>NOTE: This operation should be investigated: it is not mentioned
in any documentation, but we needed to do it once, in order to make the site work
</b>:
open <code>/etc/hosts</code> and add the line:
<pre><code class="language-bash">
127.0.0.1 $DOMAIN
</code></pre>
</p>
</details>
</body>
<script type='text/javascript'>
// customizable global variables:
var $DOMAIN = 'egsim.gfz-potsdam.de';
var $DJANGO_PROJECT = '[DJANGO_PROJECT]';
var $DJANGO_USER = '[DJANGO_USER]';
var $PYTHON_VERSION = '3.11.2';
var $GUNICORN_PORT = '8001';
// all global variables (the vars listed above plus other inferred from them):
var allVars = [
'$DJANGO_USER',
'$DOMAIN',
'$DJANGO_PROJECT',
'$PYTHON_VERSION',
'$VENV_PATH',
'$VENV_ACTIVATE',
'$CURRENT_PYTHON',
'$EGSIM_DATA_DIR',
'$EGSIM_LOG_DIR',
'$EGSIM_CONFIG_DIR',
'$EGSIM_CWD',
'$GUNICORN_PORT'
];
// script for custom code on page load:
window.onload=function(){
// replace variables $... with <span> updated automatically everytime
// we change the content of the $... variable
var body = document.querySelector('body');
var docText = body.innerHTML;
for (var v of allVars){
var reg = new RegExp('\\' + v, "g"); // escape first $
docText = docText.replace(reg, '<span data-key="' + v + '"></span>');
}
body.innerHTML = docText;
// set defaults on input components:
for (let id of ['DJANGO_USER', 'DOMAIN', 'DJANGO_PROJECT', 'PYTHON_VERSION', 'GUNICORN_PORT' ]){
let elm = document.getElementById(id);
// set input value from var:
elm.value = window['$'+id];
// attach listener on input change:
elm.oninput = function(){
window['$'+id] = elm.value;
updatePageVars();
}
}
function updatePageVars(){
// update global variables that depend on other
$EGSIM_CWD = "/opt/" + $DJANGO_PROJECT + "/eGSIM";
$VENV_PATH = '/opt/' + $DJANGO_PROJECT + '/pyenv' + $PYTHON_VERSION;
$VENV_ACTIVATE = $VENV_PATH + "/bin/activate";
var vars = $PYTHON_VERSION.split('.');
var currentPython = 'python' + (vars.length >= 2 ? `${vars[0]}.${vars[1]}` : $PYTHON_VERSION);
$CURRENT_PYTHON = currentPython;
$EGSIM_DATA_DIR = "/var/opt/" + $DJANGO_PROJECT;
$EGSIM_LOG_DIR = "/var/log/" + $DJANGO_PROJECT;
$EGSIM_CONFIG_DIR = "/etc/opt/" + $DJANGO_PROJECT;
//update everything:
for (let v of allVars){
var spans = document.querySelectorAll('span[data-key="' + v + '"]');
for(var span of spans){
span.innerHTML = window[v];
}
}
}
updatePageVars();
// trim code, removing leading and trailing spaces:
var codes = document.querySelectorAll('pre > code');
for(var code of codes){
code.innerHTML = code.innerHTML.trim();
}
// make TOC (table of contents):
var ul = document.createElement('ul');
var toc = document.getElementById('toc');
for (var h of document.querySelectorAll('h1,h2,h3')){
// add to each H* element an id inferred from their inner HTML:
var id = h.innerHTML.replace('/\s/', '_');
h.setAttribute('id', id);
// create an anchor pointing to that H* document section:
var a = document.createElement('a');
a.setAttribute('href', '#'+id);
a.innerHTML = h.innerHTML;
// create a <li> wrapping the anchor above:
var li = document.createElement('li');
// indent the li according to its level (h1, h2 etcetera):
margin = parseInt(h.tagName.substring(1));
li.style.marginLeft = margin + 'rem';
// append all:
li.appendChild(a);
ul.appendChild(li);
}
document.getElementById('toc').innerHTML = ''; // clear
document.getElementById('toc').appendChild(ul);
}
</script>
<!-- scripts for specific syntax highlight in prism (is there a reason we have to put them at the bottom?): -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.16.0/prism.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.16.0/components/prism-bash.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.16.0/components/prism-nginx.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.16.0/components/prism-python.min.js"></script>
</html>