Code, Explained
by shkhan
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Apache Python3 Gunicorn

My journey to install Gunicorn to server Python project is not pleasant because of old Ubuntu system where Python version 3.5 installed but default Gunicorn not compatible with this version.

So, as suggested from gunicorn.org I need to install Gunicorn version 3 for Python 3 … The point is, I need to install this Gunicorn 3 at outside of my virtual environment.

First of all we need to change wsgi.py file in Python project in my case – “<project root>/helloworld/wsgi.py”

import os, sys
# add the hellodjango project path into the sys.path
sys.path.append('/home/django-helloworld/helloworld')

# add the virtualenv site-packages path to the sys.path
sys.path.append('/home/django-helloworld/myvenv/lib/python3.5/site-packages')

from django.core.wsgi import get_wsgi_application
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'helloworld.settings')
application = get_wsgi_application()

Above file I added two lines because while executing from gunicorn 3 (which installed outside of virtual environment i.e. into OS) Python can’t find Django or other project related package.

Posted in apache, linux, PythonTagged , , , ,
by shkhan
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Changing ZF2 core

Following file I need to change for PHP latest version compatibility.

Zend/View/Model/ViewModel.php
Zend/View/Helper/HeadLink.php
Zend/Db/ResultSet/AbstractResultSet.php

I’m maintaining a repository of ZF2 that I made change here https://github.com/razonklnbd/zf2

Posted in php, zf2
by shkhan
Posted on

Execute React JS in ntfs partition

I do development in mounted hard drive which is different than OS partition, also I like to use that mounted drive within different OS like windows and linux simultaneously. Which allow me portability of my code backup in different system.

Challenge is, I have to use such file system for that mounted drive which can accessible in most of the OS like windows, linux or iOS. And in this case NTFS is the best file system which is really portable. Problem for this FS is, it can’t support executable bit of linux which lead to raise many problem in React development. Like if you put any React project into that mounted drive, you can’t execute that code.

To solve this problem I take Docker as a solution. Simply, I create docker image of React project and execute that image. Here is the simple Dockerfile for React project –

FROM node:18
WORKDIR /app
COPY package.json ./
RUN npm install
RUN npm install -g npm@9.7.2
COPY . ./
EXPOSE 3000
CMD ["npm", "start"]

You just need to build this docker image and need to run. You can see docker log for any output for your React project.

Posted in ubuntu, windowsTagged , , , ,
by shkhan
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Changing ZF2 core 2.4.13 \Zend\Stdlib\Hydrator\AbstractHydrator::hasStrategy

class: Zend\Stdlib\Hydrator\AbstractHydrator
function: hasStrategy
php version: 7.4

public function hasStrategy($name)
{
if(is_array($this->strategies))
return array_key_exists($name, $this->strategies)
|| array_key_exists(‘*’, $this->strategies);
if(is_object($this->strategies)) return property_exists($this->strategies, $name);
return false;
}

new change / new code

Deprecated: array_key_exists(): Using array_key_exists() on objects is deprecated. Use isset() or property_exists() instead in /media/shkr-home-wifi/works/workspace/vendor/ZF2/library/ Zend\Stdlib\Hydrator\AbstractHydrator on line 87

reason of change

public function hasStrategy($name)
{
return array_key_exists($name, $this->strategies)
|| array_key_exists(‘*’, $this->strategies);
}

previous code
Posted in php, zf2Tagged , , , , ,
by shkhan
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Changing ZF2 Core 2.4.13 /Zend/I18n/Translator/Loader/Gettext::load

class: Zend\I18n/Translator/Loader/Gettext
function: load
php version: 7.4

Last portion change …….

if ($textDomain->offsetExists(”)) {
$rawHeaders = explode(“\n”, trim($textDomain->offsetGet(”)));
foreach ($rawHeaders as $rawHeader) {
list($header, $content) = explode(‘:’, $rawHeader, 2);
if (trim(strtolower($header)) === ‘plural-forms’) {
$textDomain->setPluralRule(PluralRule::fromString($content));
}
}
$textDomain->offsetUnset(”);
}

………….. end of change ………………..

Reason to change: Deprecated: array_key_exists(): Using array_key_exists() on objects is deprecated. Use isset() or property_exists() instead in …/Zend/I18n/Translator/Loader/Gettext.php on line 142

///////// previous code ///////////////////

if (array_key_exists(”, $textDomain)) {
$rawHeaders = explode(“\n”, trim($textDomain[”]));
foreach ($rawHeaders as $rawHeader) {
list($header, $content) = explode(‘:’, $rawHeader, 2);
if (trim(strtolower($header)) === ‘plural-forms’) {
$textDomain->setPluralRule(PluralRule::fromString($content));
}
}
unset($textDomain[”]);
}

Posted in php, zf2Tagged , , , ,
by shkhan
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Copy large amount of file to remote server using nohup tar and ssh

This command will copy large amount of file to remote server by compressing and decompressing on the fly. It saves time and bandwidth. It will execute in background, so you can detach current login session.

nohup sh -c “tar -c /any/directory/at/source/server/ | gzip -2 | ssh server-alias ‘cat | tar xz -C /target/directory/of/target/server/'” > /dev/null 2>&1 &

here nohup output sent to /dev/null that means i don’t want any nohup output. you can adjust its behavior.

I use the command for millions of file that occupied more than 500 GB.

Posted in linuxTagged , , ,
by shkhan
Posted on

add new hard disk into ubuntu more than 2TB size

lsblk

will list available device

parted /dev/sdd

considered device “sdd” from lsblk output

(parted) mklabel gpt
(parted) mkpart primary ext3 0 100%
(parted) print
(parted) quit

mkfs.ext3 /dev/sdd1

this command will format this hard disk into ext3 file system as we instruct by parted command

mkdir /home/data

mounting point directory creating

mount -t ext3 /dev/sdd1 /home/data

mounting formatted hard disk into target directory

blkid

try to find ID of new hard disk to write into fstab so that after restart our hard disk will mount automatically

sample output of blkid

/dev/sdd1: UUID="20e4b16b-4d4c-4053-b6f4-a2c103f2db2f" TYPE="ext3" PARTLABEL="primary" PARTUUID="33658d68-726f-4398-992f-2aaafebe17ff"

vi /etc/fstab

give an entry for our new hard disk at the end of this file

example entry

UUID=20e4b16b-4d4c-4053-b6f4-a2c103f2db2f /home/data ext3 nofail 0 0
Posted in linux, ubuntuTagged , , , ,
by shkhan
Posted on

recursive change group and file mode in linux and detach active login session

change group

nohup sh -c “find /any/path/that/need/to/change/* -group mygroup -exec chgrp www-data {} \;” > /dev/null 2>&1 &

traditional way

nohup sh -c “chgrp -R www-data /any/path/that/need/to/change” > /dev/null 2>&1 &

change mode

nohup sh -c “find /any/path/that/need/to/change/* -perm u=rw,g=r,o=r -execdir chmod g+w {} \;” > /dev/null 2>&1 &

traditional way

nohup sh -c “chmod -R g+w /any/path/that/need/to/change” > /dev/null 2>&1 &

Posted in linux, ubuntuTagged , , , , , ,
by shkhan
Posted on

Changing ZF2 Core 2.4.13 Zend\View\Helper\HeadLink::createDataStylesheet

class: Zend\View\Helper\HeadLink
function: createDataStylesheet
php version: 7.3

public function createDataStylesheet(array $args)
{
$rel = ‘stylesheet’;
$type = ‘text/css’;
$media = ‘screen’;
$conditionalStylesheet = false;
$href = array_shift($args);
if ($this->isDuplicateStylesheet($href)) { return false; } if (0 < count($args)) { $media = array_shift($args); if (is_array($media)) { $media = implode(',', $media); } else { $media = (string) $media; } } if (0 < count($args)) { $conditionalStylesheet = array_shift($args); if (!empty($conditionalStylesheet) && is_string($conditionalStylesheet)) { $conditionalStylesheet = (string) $conditionalStylesheet; } else { $conditionalStylesheet = null; } } $attributes = compact('rel', 'type', 'href', 'media', 'conditionalStylesheet'); if (0 < count($args) && is_array($args[0])) { $extras = array_shift($args); $attributes['extras'] = (array) $extras; } return $this->createData($attributes); }

new/modified/final/current code

public function createDataStylesheet(array $args)
{
$rel = ‘stylesheet’;
$type = ‘text/css’;
$media = ‘screen’;
$conditionalStylesheet = false;
$href = array_shift($args);
if ($this->isDuplicateStylesheet($href)) { return false; } if (0 < count($args)) { $media = array_shift($args); if (is_array($media)) { $media = implode(',', $media); } else { $media = (string) $media; } } if (0 < count($args)) { $conditionalStylesheet = array_shift($args); if (!empty($conditionalStylesheet) && is_string($conditionalStylesheet)) { $conditionalStylesheet = (string) $conditionalStylesheet; } else { $conditionalStylesheet = null; } } if (0 < count($args) && is_array($args[0])) { $extras = array_shift($args); $extras = (array) $extras; } $attributes = compact('rel', 'type', 'href', 'media', 'conditionalStylesheet', 'extras'); return $this->createData($attributes); }

previous/original/old code
Posted in php, zf2Tagged , , , ,