Redirecting From Within Helper Functions - Flask

15 Nov 2014

from flask import Flask, redirect from werkzeug.routing import RoutingException, HTTPException app = Flask(__name__) @app.route('/') def hello_world(): def helper_function(): # Attempt #1 # this obviously won't work: return redirect('www.google.com') # the program would just return 'Hello World!' # Attempt #2 # THIS IS PERMANENT!: raise RequestRedirect('example2') # your browser will cache the status 301 and ALWAYS redirect # explanation: http://stackoverflow.com/a/16371787/1364191 # Attempt #3 class RequestRedirect(HTTPException, RoutingException): """Raise if the map requests a redirect. This is for example the case if `strict_slashes` are activated and an url that requires a trailing slash. The attribute `new_url` contains the absolute destination url. The attribute `code` is returned status code. """ def __init__(self, new_url, code=301): RoutingException.__init__(self, new_url) self.new_url = new_url self.code = code def get_response(self, environ): return redirect(self.new_url, self.code) raise RequestRedirect('example3', code=302) helper_function() return 'Hello World!' @app.route('/example2') def example2(): return 'Example 2' @app.route('/example3') def example3(): return 'Example 3' if __name__ == '__main__': app.run(host="0.0.0.0", port=9999, debug=True)

Reload Enviromental Variables Without Logging Out - Ubuntu

15 Nov 2014 This doesn't actually work: "source /etc/environment"
This did the trick though:

for line in $( cat /etc/environment ) ; do export $line ; done

http://superuser.com/questions/339617/how-to-reload-etc-environment-without-rebooting#comment371112_339617

Open Source Charting Library With Vertical Markers/Annotations

15 Nov 2014 Saw this charting library from the Mozilla Metrics Team on hacker news recently: http://metricsgraphicsjs.org/interactive-demo.htm

Their interactive example is here: http://metricsgraphicsjs.org/interactive-demo.htm

I'm not aware of any other charting libraries besides highcharts that do vertical marker lines this easily.

Python datetime.strftime Cheat Sheet

14 Nov 2014 http://strftime.org/

Using Bootstrap-DateRangePicker As A Timepicker

11 Nov 2014 Here's the jsfiddle: http://jsfiddle.net/d8uomdjv/

It seems like the author is opposed to adding this sort of functionality: https://github.com/dangrossman/bootstrap-daterangepicker/issues/295

re.match vs re.search - Python

11 Nov 2014 http://stackoverflow.com/a/180993/1364191

re.match - If zero or more characters at the beginning of string match the regular expression pattern.
re.search - Scan through string looking for a location where the regular expression pattern produces a match

New Machine Setup For Flask Development On Ubuntu

09 Nov 2014

Here are the commands I use when I bring up a new Ubuntu server for flask development:

sudo apt-get update && time sudo apt-get dist-upgrade sudo timedatectl set-timezone America/Chicago apt-get install git fail2ban htop nano mkdir -p .ssh nano .ssh/authorized_keys eval `ssh-agent -s` ssh-add ~/.ssh/id_rsa apt-get install python-setuptools easy_install pip pip install virtualenvwrapper sudo mkdir ~/virtualenvs sudo sh -c "echo 'WORKON_HOME=~/virtualenvs' >> /etc/environment" for line in $( cat /etc/environment ) ; do export $line ; done mkdir -p $WORKON_HOME sudo sh -c "echo 'source /usr/local/bin/virtualenvwrapper.sh' >> ~/.bashrc" bash mkvirtualenv default apt-get install python-dev

MySQL Performance LXC Container vs Host

23 Oct 2014 I have a linux virtual container (LXC) and the server hosting the container running the same version of MySQL with the same database.

I tried running some select queries on both of the both the virtual container and host for benchmark purposes. My conclusion? MySQL read performance inside and outside the LXC container is the exactly the same.

WHMCS Cronjob Error

22 Oct 2014 If you get the following error while you try to run the WHMCS cronjob from the command line:
Site error: the file <b>/var/www/accounts/admin/cron.php</b> requires the ionCube PHP Loader ioncube_loader_lin_5.3.so to be installed by the website operator. If you are the website operator please use the <a href="http://www.ioncube.com/lw/">ionCube Loader Wizard</a> to assist with installation.

You need to add your the ioncube zend extension to the CLI php.ini too: /etc/php5/cli/php.ini

Sendmail/STARTTLS verify=FAIL

19 Oct 2014

Oct 19 14:04:34 Billing sm-mta[17583]: STARTTLS=client, relay=aspmx.l.google.com., version=TLSv1/SSLv3, verify=FAIL, cipher=ECDHE-RSA-RC4-SHA, bits=128/128

If you see those errors in your mail.log and your emails are failing to send, you need to add your ssl cert from apache to the sendmail config in /etc/mail/sendmail.cf:

# CA directory

O CACertPath=/etc/apache2/ssl

# CA file

O CACertFile=/etc/apache2/ssl/example.ca-bundle

# Server Cert

O ServerCertFile=/etc/apache2/ssl/example.cert

# Server private key

O ServerKeyFile=/etc/apache2/ssl/example.key

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