Archive for category development

Extracting amenity tag info from OSM database in 3 simple steps

Step 1. Download the needed OSM database in PBF format from here: planet.openstreetmap.org (be careful, it has huge size, many GBs)

Step 2. Install golang package for for decoding osm pdf files: github.com/qedus/osmpbf

Step 3. Use simple golang program below to decode whatever you need (let’s say you need to find all petrol stations)

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Creating ubuntu service for go app

Step 1

Install go program with go install in the app folder

Step 2

Download service script file from here: Service for go app

Step 3

Change {{USERNAME}} in the script to the user you use in ubuntu to run your app and change  {{APPNAME}}  to binary name in your $GOPATH/bin/, if needed fix the path in cmd variable to point to your own $GOPATH folder

Step 4

Rename the service remove ending ‘.sh’ and copy the service file in the folder  /etc/init.d/

Step 5

Run in the terminal chmod 700 /etc/init.d/goappservice

Step 6

Run sudo update-rc.d goappservice defaults

Step 7

Run sudo update-rc.d goappservice enable

Done!

Use usual service commands to work with your new service.

sudo service goappservice start|stop|restart|status

If there is a new version of the app then just run go install in the app folder and restart the service.

Enjoy

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Sending mail using TLS with Go

As I did not find any example of go program which is sending UTF-8 mail with TLS, I decided to create my own go package with this functionality + example, find more details here: https://github.com/bykovme/tlsmailgo-mascot-mail

 

Mail message can be sent this easy:

 

mail := tlsmail.TLSMail{
	Host:     "mail.your_favorite_hosting_provider.here",  
	Port:     "465",                           
	Sender:   "noreply@mail_from.here",        
	Password: "123456",                        
	TO:       []string{"mail1@mail_to.here"},
	Subject:  subject,                       
	Body:     body,                          
}

err := mail.Send()

if err != nil {
	log.Println("Mail send failure: " + err.Error())
} else {
	log.Println("Mail sent successfully")
}

Enjoy!

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Fixing not working auto-completion for golang in Visual Studio Code

gophervsMy favorite code editor for GO  (Visual Studio Code with Go extenstion from lukehoban) on my Mac sometimes loses its intelligent behavior when suddenly code completion stops to work.

Usually just couple of commands in terminal recovers auto-completion back to life:

  1. Close Visual Studio Code
  2. Open terminal and stop gocode with gocode close
  3. Update gocode with the command `go get -u github.com/nsf/gocode`
  4. Start Visual Studio Code again and enjoy.

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Configure Ubuntu to work as GO web server

Картинки по запросуI’m often creating go apps or services using Digital Ocean droplets with Ubuntu, that’s why I decided to create a script to automate configuration process.

 

The script is doing following:

  1. Installs and configures firewall (ufw, allows only ports 80, 443 & 22)
  2. Installs git (required by go)
  3. Installs mysql and secures it with mysql_install_db
  4. Installs the latest version of GO (1.7.5), configures go environment (PATH, GOPATH)
  5. Installs go application from public git repository, yours or my demo (development for private is in progress) with ‘go get’
  6. Configures go app to work as a service (add config into /etc/init.d), starts the service
  7. Installs and configures nginx to work as proxy for go app

Script can be started directly from github:

bash <(curl -s https://raw.githubusercontent.com/bykovme/webgolangdo/master/preparegolangapp.sh)

Check the script and find more information here: https://github.com/bykovme/webgolangdo

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Create ipa file for iPhone without signing to Apple (command line)

terminal-iconExporting to ipa file from XCode requires to login to Apple before doing that while you can have already all signing prerequisites locally on your Mac.

You can avoid login if you run the command below from in terminal (you can find the the path to your archive  by right clicking on it in XCode after archiving and “reveal in Finder”):

 

xcodebuild -exportArchive -archivePath "ArchiveName.xcarchive" -exportPath "ExportedIpaFileName" -exportFormat ipa -exportProvisioningProfile "YourProvisionProfile" ENABLE_BITCODE=YES

 

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Config library for golang

Publishing config library to be used with go, it stores/loads structure as JSON file, so you can use it to keep options of your app: github.com/bykovme/goconfig

Example of using: github.com/bykovme/goconfig/blob/master/example/load_config.go

There are only 5 functions:

  • SaveConfig – saving configuration from structure into the file
  • LoadConfig – loading configuration from file into the structure
  • SearchForConfigFile – search for config file in different locations
  • GetLocalPath – get current path where executable app is running
  • GetUserPath – get user home folder

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