Sending a registry entry from C# to C

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Threading;
namespace CODE
{
    public unsafe class Connector
    {
        private string PathKey = "Path";
        // needs to be constant...
        private const string PathToCDLL = @"C:\path\to\c\dll"; 
        public void InitPath()
        {
            string Path = new Globals().getRegistryEntry(this.PathKey);
            // string characters are 2 bytes long in C#, C needs 1 byte chars:
            System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
            Byte[] path = encoding.GetBytes( Path );
            init_path_c(path);
        }
        [DllImport(PathToCDLL, EntryPoint = "init_path", ExactSpelling = true, CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
        private static extern void init_path_c([MarshalAs(UnmanagedType.LPArray)] byte[] Path );
    }
}

char* global_path;
void init_path( char* path )
{
  global_path = path;
}

Receicing a string in C# from C

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;
using System.Threading;
namespace CODE
{
    public unsafe class Connector
    {
        public string getCString()
        {
            IntPtr strPtr = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(int)));
            get_c_string(strPtr);
            return Marshal.PtrToStringAnsi(strPtr);
        }
        [DllImport(PathToCDLL, EntryPoint = "c_string", ExactSpelling = true, CharSet = CharSet.Ansi, CallingConvention = CallingConvention.Cdecl)]
        private static extern void get_c_string( IntPtr Path );
    }
}

#include <string.h>
void c_string( char* path )
{
  char* str = "This is a test string";
  strcpy ( path, str );
}

Visit the post at String interchange between C# to and ANSI C DLL

But time has passed and unfortunately, Mint 10 was not a long term support version and it’s official lifespan has ended. Also, it’s quite impossible to install the freshly released Gimp 2.8 on a 1,5 old system – which is actually ridiculous and sad, but true – so I needed to change. Ubuntu 11.04 and 11.10 was a total mess, mostly with the premature Unity and the forced kernel updates. Between 2.6.36 and 3.2 there shouldn’t have been any update in my opinion.

Mint 12 – based on Ubuntu 11.10 – was near to useable with Cinnamon: lots of version problems, PPA not recognizing the version, etc., so right after the release of the next long-term-support Ubuntu, I decided to move back AND have the Mint desktop Cinnamon on it.

12.04 LTS ( Precise Pangolin ) comes with Unity. Unity is progressive and has a lot of ideas in it, unfortunately most of them just renders things unuseable for everyday work. It’s fun, yes, it’s nice and pretty and everything, but for someone using a linux desktop professionally, it’s simply ineffective.

Fail at install: encrypt home without swap partition

I have 4 GB memory in my notebook; it has been enough for years without swap. Even if I’m in the need of swap, I would not add it as partition just a simple file using `swapon` command. But… 12.04 requires a swap partition if you want your home folder encrypted – otherwise the whole install process will fail. Isn’t that nice from a version that’s planned for 5 years?! I’ve installed the system without encrypted home, and followed Danny Stieben‘s guide how to encrypt it on an installed system.

Yes, it’s already been reported.

Conquer your desktop once again

Two possibilities to get a desktop like the good’ol Gnome2: `gnome-panel` ( a rearranged Gnome3 fallback mode) or Cinnamon. Both provides conventional desktops, meaning you do have a window list, screen is not jumpig on the move of your mouse, you can actually find the close button for a software ( Not app. Program or software.)

gnome-panel

Gnome2 layout based on GTK3. Most of the functions are backward-compatible, meaning you can have applets again. For more information, see the OMG! Ubuntu! article on gnome-panel. It’s simple to install:

apt-get install gnome-panel

Cinnamon desktop

Cinnamon is the Linux Mint way to enlightenment: a GTK3, especiall Gnome Shell based desktop environment with traditional layout. It’s at version 1.4, lacks a lot of features, but it’s nice, fast, responsive and suprisingly low on CPU & memory usage. It’s not the part of Ubuntu, so you’re going to need to add an additional repository.

add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-stable
apt-get update
apt-get install cinnamon

I needed a dock in order to get this fully functional ( the lack of CPU applet for example ), my choose was Avant Window Navigator.

apt-get install avant-window-navigator

The for people who use their machine both day and night

I hate high contrast themes. Really. They are for vanilla people, using their pretty little machine only by day. For Gnome2 the choice was Shiki Colors, especially Shiki Brave – a more-or-less replacement for GTK3 is Zukitwo.

ThinkPad users: tp-smapi-dkms

Even in 11.04, tp-smapi install was plain simple, working right after the apt-get install command. Not from 11.10; tp-smapi-dkms moved from version 0.40 to version 0.41 and thus not working anymore. Get the package from Natty, and install it by hand. Extract it to `/usr/src/` ( as `/usr/src/tp-smapi-0.40` ), and use the following:

dkms add -m tp-smapi -v 0.40
dkms build -m tp-smapi -v 0.40
dkms install -m tp-smapi -v 0.40

Regain aircrack-ng

These are my favourite ones: a slight but, it’s not maintaned, so it gets dropped. And oh, no alternatives. Anyway, Riyaz Ahemed Walikar has written a post on gettin aircrack work in Precise Pangolin.

apt-get install build-essential libssl-dev
wget http://download.aircrack-ng.org/aircrack-ng-1.1.tar.gz
tar -zxvf aircrack-ng-1.1.tar.gz
cd aircrack-ng-1.1

Replace the line

CFLAGS ?= -g -W -Wall -Werror -O3

CFLAGS ?= -g -W -Wall -O3

in `common.mak`. Then

make && make install

From now on…

I’m going to extend this post whenever I encounter something strange.

“Loggin in…” freeze in lightdm

Caused by disabling the login sound with Ubuntu Tweak. Either replace lightdm with gdm or don’t disable the logon sound.

Wireless semi-disconnecting

The connection itself stays but no data flows in any direction. Solution by Sam Armstrong:

sudo iwconfig wlan0 power off

Visit the post at How to make Ubuntu 12.04 LTS ( Precise Pangolin) usable

Only do this if you have TIME , PATIENCE and another phone with you.
Also… this is not a tutorial. This is only a collection of links, tweaks troubleshoot methods, mostly for myself.
I don’t say this is going to work. If you do anything to your phone, you’re on your own, no one to be blamed, so be aware.

Why?

1 GHz, 576 MB RAM, has more RAM than a usual laptop 5 years ago, but 512MB flash and 150 MB for user is bloat.

Also there are no official, recommended, stable updates for HTC Desire GSM (Bravo) after Android 2.2. They released a semi-official  2.3 update: only for experienced
users – I’ve tried it after a custom ROM, it did not connect to wireless networks, I could not even start a call.

Another reason is that you want to replace the shipped apps, like I did. Sometimes there are far better applications out there than the stock ones – sometimes.

Why not?

Because something will definately go wrong, no exception. For me, it seems I cannot connect USB Mass Storage anymore, no idea why. ( I’ve tried it both in linux and Windows.)

Do not forget to make backups. Always.
And always verify them; belief is not enough.
ClockwordMod backups DO CAN FAIL. 

What you need to understand

The system of an Android phone is made up of a lot .img files. These are byte-by-byte copies of the affs2 filesystems used in embedded devices. My HTC – and probably your device too – has the following parts:

bootloader

Don’t touch this by hand. If you make a bad move, the phone can only be restored by hardware hacks, and you really don’t want to do this. Use  Revolutionary, this will unlock the features of the bootloader (S-OFF), for example, fastboot via USB.

recovery (recovery.img) 

This the “backup” system; an alternative small system you can boot into  to save the day and modify the base system. This system is usually replaced with Amon_Ra or ClockworkMod. Revolutionary installs ClockworkMod automatically.

boot (boot.img)

Loads the main kernel and the system itself. Do not confuse with bootloader: bootloader loads the boot image.

system (system.img)

This is your system, the root partition if it sounds better. Clockwordmod says it makes a yaffs2 backup, but that’s not fully true: it dd-s the filesystem, while it should be cat-ed.

data (data.img)

User data; something between /var and /home.

cache (cache.img)

Cache. Not important.

Tools & resources

• Revolutionary
  Makes things possible.
• HTC developer portal
  You can access the kernel source, but that’s only for really hardcore fans.
• shipped-roms.com
  When you reach the point of crying, this is really handy: they are collecting the original stock roms and installers.
• original HTC Desire system rooted as .zip update ( 2.10.405.5 )
  Origins from a german forum.

Custom ROMs

• cyanogen
  One of the most commonly used custom ROMs: fast, easy to use, quite stable, but has some serious bugs, like the Sleep of Death. Anyway, their wiki is a life-saver.
• LeeDroid
  Some say the best ROM in the jungle; for me, it only threw errors over errors.

Lifesavers

• adb
  This is part of all android systems: imagine it as a backdoor telnet to Android core. It can be used with USB ( default ) or via WLAN, this probably needs a rooted phone and a Terminal Emulator installed. adb can be installed as part of Android SDK.
  Also: http://jonwestfall.com/2009/08/backup-restore-android-apps-using-adb/
• fastboot
  In short, fastboot is the interface to connect your computer to the bootloader via USB. It can re-flash any part of the system except the bootloader itself.
  To see all fastboot oem commands type: `fastboot oem ?`

Hacking

Step 1: Revolutionary

This is the only step without any danger, except you will lose warranty. Do as the site says; no tricks.

Step 2: Backup

Boot into recovery: hold vol down + power, wait, press vol down, wait, press vol down twice, press power, wait for boot.

This was the step that went partly wrong in my case, therefore I’m currently unable to restore the stock system. The thing is that I did do the backup in Clockworkmod but after reboot, it constantly says md5 mismatch. Later I’ve found that it says this for all backups but while most of them is correct ( and can be solved by regenerating md5 hashed, as described here ), though my system.img really went wrong: I’m unable to re-flash it even with fastboot.

Step 3: Flash your custom ROM

This is really easy. Copy the .zip file to the sdcard, boot into recovery, wipe data, wipe cache, wipe dalvik cache, and install zip. That’s all.

Step 4: Wait

First boot takes a long time. The Dalvik ( imagine as JVM for android ) compiles what needs to be compiled. This is stored in /data/dalvik-cache.

Troubles and solvings

Recovery claims: unable to mount sdcard

Get into fastboot and send the following command:

fastboot oem enableqxdm 0

No USB Mass storage

Something happens, but the storage doesn’t show up.

Get into fastboot and try:

fastboot oem eraseconfig

Reboot, try mounting usb. If it fails: http://forum.xda-developers.com/showthread.php?t=1143252

Tweaks

Remove system apps

http://wiki.cyanogenmod.com/wiki/Barebones

Restore stock ROM

Follow the instructions ( Hungarian, so use G translate :) )

http://pzoley.matraszele.hu/desire.php?p=wiki&i=27

And … don’t forget to sleep. It’s important. 

Visit the post at HTC Desire (Bravo): ROMs, updates, pain and suffering

But how to enable TinyMCE on the frontend? I’ve came across with a blog post from revood.com with a very good tip on this. You need to add the following into your theme’s `functions.php`:

add_filter( 'comment_form_defaults', 'custom_comment_form_defaults' );
function custom_comment_form_defaults( $args ) {
    if ( is_user_logged_in() ) {
        $mce_plugins = 'inlinepopups, fullscreen, wordpress, wplink, wpdialogs';
    } else {
        $mce_plugins = 'fullscreen, wordpress';
    }
    ob_start();
    wp_editor( '', 'comment', array(
        'media_buttons' => true,
        'teeny' => true,
        'textarea_rows' => '7',
        'tinymce' => array( 'plugins' => $mce_plugins )
    ) );
    $args['comment_field'] = ob_get_clean();
    return $args;
}

Visit the post at Rich Text comments for WordPress 3.3

What I have is access to my own server, running web & email services, so there’s no graphical user interface on it. Also, command line makes really small data exchange footprint which is nice when your monthly bandwidth limited to 500MBs.

These two thing got connected when I needed to communicate with someone on Facebook. Just some messages, but it was urgent.

I’ve already known for a while that Facebook chat can be accessed with XMPP protocoll (jabber, if you’d like it more), but is there any command line xmpp chat client which does not hurt? ( Anyone remember talk? )

Yes, and it’s named EKG2.

The needed “configuration” commands after you started ekg2:

session -a xmpp:YOUR_FACEBOOK_USERNAME@chat.facebook.com
session password YOUR_FACEBOOK_PASSWORD
save
connect

Your facebook username is not the e-mail you log in with. You can read about usernames at Facebook Help..

When you want to start chat with someone:

query "His/her name"

To finish a chat, press `ALT+K`, to exit, type `quit`.

I know, it’s kinda pervert.

Visit the post at Facebook chat from linux command line

Optimize images

Properly formatting and compressing images can save many bytes of data.
Learn more

It was all over, jpg, png files mixed, all that could be reduced significantly in size! This was something I should definately had to take a look at. The jpg files were created with either imagemagick or by WordPress, so I needed an image optimization tool for both command line and as a WordPress plugin as well.

The solution came easily with a search, named CW Image Optimizer. This is a special plugin, that requires two things:

1. a command line tool package, named `littleutils`
2. PHP access to command line (exec, passthru, etc.) in this case, `exec` is needed (although in a special case, you can replace exec to something else in the plugin’s code)

The plugin is capable of bulk optimization on images already uploaded to the blog and also doing and optimization on all images uploaded from now on.

Littleutils gives you command line utilities, named `opt-*`, where `*` means the image type. Therefore `opt-png`, `opt-jpg`, `opt-gif` are the utils to optimize the images from command line.

As an example:

user@host:/wordpress-themes-dir/twentyeleven/images$ opt-png *.png
comment-arrow-bypostauthor-dark.png: unchanged
comment-arrow-bypostauthor-dark-rtl.png: unchanged
comment-arrow-bypostauthor.png: unchanged
comment-arrow-bypostauthor-rtl.png: unchanged
comment-arrow-dark.png: unchanged
comment-arrow-dark-rtl.png: unchanged
comment-arrow.png: unchanged
comment-arrow-rtl.png: unchanged
comment-bubble-dark.png: 965 vs. 762
comment-bubble-dark-rtl.png: 1868 vs. 728
comment-bubble.png: 925 vs. 775
comment-bubble-rtl.png: 1782 vs. 779
search.png: 441 vs. 436
wordpress.png: unchanged

It has a pretty nice install documentation, which includes the install of littleutils as well. I did not find any PPA repositories for this very software, therefore you need to make & install it by hand.

The outcome

And the suprising thing: this can dramatically boost both your site speed and your result at Google PageSpeed. Don’t believe me? See this.

Visit the post at Google PageSpeed says: optimize your WordPress images!

There were some discussions lately at LinkedIn mostly on the topic of choosing a VPS (virtual private server) over a shared hosting provides any benefits.
My opinion: a VPS can clearly outnumber a shared host in performance and freedom, but not in pricing. Price can only be matched when the VPS is an unmanaged one, meaning you (or someone you hire) has to take care of all the configurations, the server management, the monitoring – even the operating system install itself.

For most people this looks horrible and finding a cheap but good system operator is a nightmare for anybody. The problem is, that on a shared host you are limited to the system services. There are really few hosting providers how allow switching between web servers, or even switching PHP versions, and what’s worts: you clearly not allowed to tweak any of the services.

I know there are really few WordPress users who want – and are able – to fine tune the backend of the install, but there are tiny things which can make incredible difference.

I decided to make a little test to show how little is enough for, in this case a WordPress Network, to brutally gain on performace.
Originally I wanted to show only the power of WP-FFPC, a full page cache plugin written by me. The problem was that I left APC object cache plugin active, so I decided to show the importance of APC instead.

Test setup

• KVM VPS V1 plan from cheapVPS
• Ubuntu server 11.10
  • kernel 3.0.0-16-server
• nginx 1.0.11
  • gzip compression enabled at level 1
• PHP 5.3.6-13ubuntu3.6 with Suhosin-Patch
• Percona server (MySQL replacement) 5.5.20
• opcode cache: APC-3.1.9*
• WordPress Network 3.3.1, sunrine (domain mapping) enabled
  • WordPress cache enabled
  • APC object cache plugin*
  • WP-FFPC full page cache for APC plugin*

* APC cache was only enabled for the first test

The page I was testing is a category archive page. It shows 4 special post: all posts include numerous small pictures, some larger ones, loading jQuery with some extensions and listing some CSS files as well. It’s also a domain mapped sub-blog of the site.

I have to add that I have a little trick made on my server config. Normally all sub-site content is server by PHP in a WordPress Network. This was change by my when I added some extra into my nginx setup. If this test had been done with the default WordPress Network setup, I’m fairly sure my result would be pretty awful, please take this into your count.

The address of the tested page: http://petermolnar.eu/photoblog/

What is opcode caching?

PHP Opcode cache can store compiled variables, pages and parts of the code. By default PHP always recompile everything which is really not neccessery at most times. The opcode cache therefore uplifts a lot of uneeded compilation, speeds up the program and saves CPU time.

Load test setup

I’ve used loadimpact.com for making a stress test on my server. I have so low traffic on this very server that the stress test should make a clearly visible difference.

The test setup: 20 minutes total runtime splitted into 5 minute parts. All parts have limited maximum simultaneous users.

Users geographical dispersion

Load test results

User experience

Meanwhile on the server

These are munin the graphs taken from the server while the tests were running. There are two highlited spikes, the first time was with APC on, the second (~1 day later) is without APC cache.

Conclusions

CheapVPS performance

The performance and the capacity of the smallest – and probably one of the cheapest KVM based virtual servers – suprised me again. It could handle 100 simultaneous connections per second without opcode cache!
For calculation: if this would keep up for a day, it would result 8 640 000 hist on that day, which is way over a normal site’s traffic.
For 14.40 £ (with taxes!), this is the best buy ever.

The results

Aggregated 5 seconds page load time is not really a bad result, but the system could only handle it just for limited number of requests/second. With cache enabled the load time went down by 2 seconds, which is really much (~40%) and also, I could not reach the limit of the server.
For calculation: keeping 220 requests/second rate for a day would result 19 008 000 hits per day, and the server is still serving all the content with the same speed.

The munin graphs show another important thing: without cache, the server load can be measured at lest 3 times multiplied. This also results that the ethernet traffic and the handled nginx requests per second will fall off.

Overall conclusion

• CheapVPS worths every penny
• PHP opcode cache should be implemented in it by default, without the need if installing additions
• always install PHP opcode on a server
• tweaking the backend can bring out true performance even with WordPress

Visit the post at Testing WordPress: the importance of PHP opcode cache

]]> http://petermolnar.eu/linux-tech-coding/testing-wordpress-the-importance-of-php-opcode-cache/feed/ 0 http://petermolnar.eu/linux-tech-coding/ubuntu-11-10-disable-waiting-up-to-60-more-seconds-for-network-configuration/ http://petermolnar.eu/linux-tech-coding/ubuntu-11-10-disable-waiting-up-to-60-more-seconds-for-network-configuration/#comments Wed, 29 Feb 2012 19:34:18 +0000 petermolnar http://petermolnar.eu/?p=2592 After upgrading from Ubuntu 11.04 to 11.10 boot hangs for more than one minute, waiting for network. Here's how to solve it the correct way.

Visit the post at Ubuntu 11.10 disable “Waiting up to 60 more seconds for network configuration”

]]>

This post is made of copy-pasted parts from a blog post on CodeWhirl, from author Wrostek. I only placed it here to make Google show better results for the correct solution instead of the symlink one.

The original post can be visited here: http://www.codewhirl.com/2011/10/ubuntu-11-10-waiting-up-to-60-more-seconds-for-network-configuration/

---

 

So, the only other solution must be to edit ‘Waiting for network configuration…’ script. This script is actually located here: `/etc/init/failsafe.conf`

Around 25 lines down in the file you will see a section:

# Plymouth errors should not stop the script because we *must* reach
# the end of this script to avoid letting the system spin forever
# waiting on it to start.
$PLYMOUTH message –text=”Waiting for network configuration…” || :
sleep 40
$PLYMOUTH message –text=”Waiting up to 60 more seconds for network configuration…” || :
sleep 59
$PLYMOUTH message –text=”Booting system without full network configuration…” || :

To solve the problem, you can just remove the calls to sleep, by commenting the out ( or at least reduce the wait time if your network really does need to wait )

# Plymouth errors should not stop the script because we *must* reach
# the end of this script to avoid letting the system spin forever
# waiting on it to start.
$PLYMOUTH message –text=”Waiting for network configuration…” || :
#sleep 40
$PLYMOUTH message –text=”Waiting up to 60 more seconds for network configuration…” || :
#sleep 59
$PLYMOUTH message –text=”Booting system without full network configuration…” || :

Visit the post at Ubuntu 11.10 disable “Waiting up to 60 more seconds for network configuration”

]]> http://petermolnar.eu/linux-tech-coding/ubuntu-11-10-disable-waiting-up-to-60-more-seconds-for-network-configuration/feed/ 0 http://petermolnar.eu/linux-tech-coding/conky-with-ical/ http://petermolnar.eu/linux-tech-coding/conky-with-ical/#comments Mon, 20 Feb 2012 09:45:15 +0000 petermolnar http://petermolnar.eu/?p=2519 Make conky display ical calendars from the web with the help of calcurse.

Visit the post at conky with ical

]]> I encountered a simple problem: how to display ical calendar events with conky without writing an ical parser.
The solution came in the form of a suprising tool: calcurse. This is a command-line, text-based, slightly graphical-like interface for ical handling.

So: download the calendar, import it into calcurse, show it in conky. But how to manage possible remote update? Do this every 30 minutes.

load_calendars.sh

#!/bin/bash
# clear calcurse data
rm ~/.calcurse/apts
# array for remote calendars
calendars=( ‘http://link-to-first-cal.ics’ ‘http://link-to-second-cal.ics’ ‘and so on’ );
# temp file to save a calendar
TMPCAL=/tmp/temp.ics
# run through the calendars
for ical in “${calendars[@]}”
do
	# download ical file
	wget -q “$ical” -O $TMPCAL
	# import into calcurse, error & output silenced
	calcurse -i $TMPCAL >/dev/null 2>&1
	# clear the temp calendar file
	rm $TMPCAL
done
# display current & next 6 days (7 altogether)
calcurse -r7

conky script to show elements

Update interval is one hour, window placed to left top corner + 20 px left & top gap.


use_xft yes
xftfont DejaVu Sans:size=8
xftalpha 0.8
text_buffer_size 2048
total_run_times 0
no_buffers yes
uppercase no
cpu_avg_samples 1
net_avg_samples 1
override_utf8_locale yes
double_buffer yes
use_spacer none
own_window yes
own_window_transparent yes
own_window_type normal
own_window_hints undecorated,below,sticky,skip_taskbar,skip_pager
minimum_size 420 0
maximum_width 420
draw_shades no
draw_outline no
draw_borders no
stippled_borders 0
border_width 0
default_color grey
own_window_colour grey
alignment top_left
update_interval 3600
gap_x 20
gap_y 20
TEXT
${font DejaVu Sans:style=Bold:size=10}EVENTS${font}
${font DejaVu Sans:size=9}${exec /path/to/load_calendars.sh}${font}

Visit the post at conky with ical

]]> http://petermolnar.eu/linux-tech-coding/conky-with-ical/feed/ 0 http://petermolnar.eu/linux-tech-coding/reduced-functionality-switch-case-in-nginx-map-module/ http://petermolnar.eu/linux-tech-coding/reduced-functionality-switch-case-in-nginx-map-module/#comments Sat, 11 Feb 2012 06:55:33 +0000 petermolnar http://petermolnar.eu/?p=2490 There's no switch-case in nginx, though map is available for similar but reduced functionality cases.

Visit the post at reduced functionality switch – case in nginx: map module

]]> I was searching for a switch-case possibility in nginx without success. Although a module named “map” can do something similar but only for setting a variable.

Like the following:


map $host $dirnum {
		default				0;
		domain1.com			1;
		domain2.com			2;
	}

This has to be placed outside the `server` part but inside `http`.

Afterwards the variable becomes useable, in, for example rewrite rules:


# if domain is mapped
if ($dirnum != 0 )
{
	rewrite ^/files/(.*)$ /wp-content/blogs.dir/$dirnum/files/$1 last;
}
# otherwise fall back to "normal" rule
if ($dirnum = 0 )
{
	rewrite ^(.*)/files/(.*)$ /wp-includes/ms-files.php?file=$2 last;
}

Visit the post at reduced functionality switch – case in nginx: map module

]]> http://petermolnar.eu/linux-tech-coding/reduced-functionality-switch-case-in-nginx-map-module/feed/ 0