Editing Heroku

==Installation== 
* [[EDTLaptop1#Heroku|Windows 10 Laptop]]

==Concepts==
* all Heroku applications run in a collection of lightweight Linux containers called '''Dynos'''. To find out the dynos:
 heroku ps
* Procfiles can contain additional process types. For example, you can declare a background worker that processes items off a queue. 
* The set of dynos declared in your Procfile and managed by the dyno manager via heroku ps:scale are known as the '''dyno formation'''. These dynos do the app’s regular business (such as handling web requests and processing background jobs) as it runs. When you wish to do one-off administrative or maintenance tasks for the app, or execute some task periodically using Heroku Scheduler, you can spin up a '''one-off dyno'''.

===Interface===
* [https://id.heroku.com/login Dashboard] login with user, password and Salesforce App on mobile

===Config and Environment Variables===
* config variables are static and available via <code>heroku config</code> or via the Heroku Dashboard
* environment variables are dynamic and are available via <code>heroku run env</code>

==Add Ons==

===Databases===
* [https://devcenter.heroku.com/articles/connecting-to-relational-databases-on-heroku-with-java documentation]
* connection information see config var DATABASE_URL [database type]://[username]:[password]@[host]:[port]/[database name]
====Postgres====
* DB info [https://dashboard.heroku.com/apps dashboard] -> <APPLICATION> -> Resources

==Operation==
===List all Applications===
 heroku apps

===Delete Application===
 heroku apps:destroy uweheuer-capstone

===Show Infos for Apps like Repo Size===
 heroku apps:info

===List all Domains (for Applications)===
 heroku domains

===Logging===
* via dasboard
[[File:heroku1.PNG|400px]]
* or via command line
 heroku logs --tail

==Example==
===Official Tutorial===
* from [https://devcenter.heroku.com/articles/getting-started-with-python official python tutorial]
 PS C:\Temp\python-getting-started> heroku login
* clone example
* create app and push code
* start the app
 PS C:\Temp\python-getting-started> heroku ps:scale web=1
 Scaling dynos... done, now running web at 1:Free
 PS C:\Temp\python-getting-started> heroku open
 // opens https://arcane-peak-78109.herokuapp.com/
* open the [https://dashboard.heroku.com/apps dashboard]
* stop it or scale it down to 0
 heroku ps:scale web=0
* prepare for running locally
 PS C:\Temp\python-getting-started> python -m venv venv
 PS C:\Temp\python-getting-started> .\venv\Scripts\activate
 (venv) PS C:\Temp\python-getting-started> pip install -r .\requirements.txt
* run it locally 
 (venv) PS C:\Temp\python-getting-started> python manage.py collectstatic
 (venv) PS C:\Temp\python-getting-started> heroku local -f .\Procfile.windows
* open it http://localhost:5000/

===Spring Boot Demo===
====Configuration for Heroku====
* steps from [https://devcenter.heroku.com/articles/deploying-spring-boot-apps-to-heroku offical Spring Boot tutorial]
* create demo1 application in <code>C:\Uwes\Programme\eclipse\workspace\demo1</code> and git it
* see SpringBoot.docx
* When deploying an app, Heroku reads <code>pom.xml</code> file and installs the dependencies by running <code>mvn clean install</code>. 
* check DB connection by
 C:\Uwes\Programme\PostgreSQL\12\bin> .\[[Postgres#Operation|psql]] -h ec2-3-230-122-20.compute-1.amazonaws.com -U cepxizounlueue defpfuas3qslld
* set specific configurations for Heroku by adding profile <code>heroku</code> to <code>pom.xml</code> and set config var <code>MAVEN_CUSTOM_OPTS</code> to <code>-P !local_dev,heroku</code>

====Run on Heroku====
 git push heroku master
 heroku open // opens the application https://intense-caverns-96515.herokuapp.com/ in a browser

====Prepare Locally Heroku====
* create Procfile <code>Procfile.windows</code> for running locally with command to start the Spring application <code>java -jar target/demo1-0.0.1-SNAPSHOT.jar</code>
* compile and build a JAR, with dependencies, placing it into your application’s target directory. The <code>spring-boot-maven-plugin</code> in the <code>pom.xml</code> provides this process
 mvn install
* create local DB
 C:\Uwes\Programme\xampp7.2.27\mysql\bin\mysql --user=root --password=mHalloo0@1m
   create database demo1;
* create <code>C:\Uwes\eclipse\workspace_2020-12\SpringBoot\demo1\set_local_dev.bat</code>
* add profile local_dev to <code>pom.xml</code>

====Run Heroku Locally====
* run the application
 set_local_dev.bat
 // start eclipse by start_eclipse.bat from shell and run it or
 heroku local -f Procfile.windows

====Run Eclipse Locally====
* see <code>src\main\resources\application.properties</code> which is not in Git repository
* start eclipse

==Resources==
* [https://devcenter.heroku.com/articles/getting-started-with-python Tutorial]
* [https://dashboard.heroku.com/apps Heroku dashboard]