progrium

import gevent
import gevent.pool

class GroupWithExceptionCatching(gevent.pool.Group):
    def __init__(self, *args):
        super(GroupWithExceptionCatching, self).__init__(*args)
        self._error_handlers = {}
    
    def _wrap_errors(self, func):
        """Wrap a callable for triggering error handlers

lbolla

Asynchronous programming with Tornado

Asynchronous programming can be tricky for beginners, therefore I think it's useful to iron some basic concepts to avoid common pitfalls.

For an explanation about generic asynchronous programming, I recommend you one of the [many][2] [resources][3] [online][4].

I will focus on solely on asynchronous programming in [Tornado][1]. From Tornado's homepage:

MihailJP

function clone (t) -- deep-copy a table
    if type(t) ~= "table" then return t end
    local meta = getmetatable(t)
    local target = {}
    for k, v in pairs(t) do
        if type(v) == "table" then
            target[k] = clone(v)
        else
            target[k] = v
        end

border

 ~ ✗ diff -ruN mutex.go mutexv2.go
--- mutex.go	2012-10-25 11:30:04.170656858 +0800
+++ mutexv2.go	2012-10-25 11:30:04.174656858 +0800
@@ -9,8 +9,9 @@
 )
 
 type Msg struct {
-	mutex sync.Mutex
-	count map[int64]string
+	rmutex sync.RWMutex

epicserve

#!/usr/bin/env bash

# This script prints out all of your Redis keys and their size in a human readable format
# Copyright 2013 Brent O'Connor
# License: http://www.apache.org/licenses/LICENSE-2.0

human_size() {
        awk -v sum="$1" ' BEGIN {hum[1024^3]="Gb"; hum[1024^2]="Mb"; hum[1024]="Kb"; for (x=1024^3; x>=1024; x/=1024) { if (sum>=x) { printf "%.2f %s\n",sum/x,hum[x]; break; } } if (sum<1024) print "1kb"; } '
}

mikesmullin

#!/usr/bin/env bash
# script:  watch
# author:  Mike Smullin <[email protected]>
# license: GPLv3
# description:
#   watches the given path for changes
#   and executes a given command when changes occur
# usage:
#   watch <path> <cmd...>
#

plentz

# to generate your dhparam.pem file, run in the terminal
openssl dhparam -out /etc/nginx/ssl/dhparam.pem 2048

jpsim

1. Plain Strings (207): foo
2. Anchors (208): k$
3. Ranges (202): ^[a-f]*$
4. Backrefs (201): (...).*\1
5. Abba (169): ^(.(?!(ll|ss|mm|rr|tt|ff|cc|bb)))*$|^n|ef
6. A man, a plan (177): ^(.)[^p].*\1$
7. Prime (286): ^(?!(..+)\1+$)
8. Four (199): (.)(.\1){3}
9. Order (198): ^[^o].....?$
10. Triples (507): (^39|^44)|(^([0369]|([147][0369]*[258])|(([258]|[147][0369]*[147])([0369]*|[258][0369]*[147])([147]|[258][0369]*[258])))*$)

dbehnke

"""
client.py - AsyncIO Server using StreamReader and StreamWriter

This will create 200 client connections to a server running server.py

It will handshake and run similar to this:

Server: HELLO
Client: WORLD

christopher-hopper

Resize a Hard Disk for a Virtual Machine

Our Virtual Machines are provisioned using Vagrant from a Linux base box to run using VirutalBox. If the Hard Disk space runs out and you cannot remove files to free-up space, you can resize the Hard Disk using some VirtualBox and Linux commands.

Some assumptions

The following steps assume you've got a set-up like mine, where: