# pollenviz
The purpose of the application is store and visualise pollen data. 

## PLEASE NOTE
This branch (master) is under development and will frequently change.  
Please use the v1.0 tag to install pollenviz.  

## Features
* Simple data import with csv files via gui or api
* GUI for editing data
* View and compare data


## Requirements
The following is required to install and run the application:
* Postgres 9.5+ (https://www.postgresql.org/download/)
* Postgis extension (https://postgis.net/install/)
* Python 3 (https://www.python.org/downloads/)
* Yarn/NPM
* WSGI complient server
* See requirements.txt for external python libraries used

## Configuration
Add a file in the web folder called config.ini.   
Look at config.example.ini to see what needs to be inside.

## Database
Setup postgres database with the postgis extension.  
Import the schema.sql file from the db_scripts folder.  

## Running the app
Install all required python libraries with:  
```powershell
pip install -r requirements.txt
```   

Navigate to the web/client folder and build the gui with the command: 
```powershell
yarn install
yarn build
```  

Run the python server with the the following command:  
**Linux**
```powershell
export FLASK_APP=web
flask run
```  

**Windows**
```powershell
$env:FLASK_APP = "web" 
flask run
```  
See https://flask.palletsprojects.com/en/1.1.x/quickstart/ for more information.


## Development
Make sure you have all javascript packages installed by running `yarn` in the web/client folder.  
Run `yarn build` once so the python server has the required files.  
Start the web server as described in "running the app"  
Start the client side server by running the command `yarn serve`

## Linux web server

On the webserver we have to start with a configuration for apache2. Write a custom configuration file, /etc/apache2/sites-available/pollenviz.conf.

The ServerName settings in pollenviz.conf has to be registered as a CNAME, pointing to the A-record for the webserver, in the DNS-servers.

Make ssl-certs for https://someurl.com, and put the key and crt file into /etc/apache2/ssl.

Make a DocumentRoot directory under /var/www/html, call it pollenviz. Give it sufficient permissions for apache2 to be able to read it.

Copy all of the files in the web folder to there.

Make a pollenviz.wsgi file, to start the application. Here we source the virtual environment and starts the application.

Next is to make a virtual environment for python, and then installing all the modules from requirement.txt from that. psycopg2 is dependent on libpq-dev and python-dev. 


## IIS  
Please follow this article to install the application on IIS:
http://netdot.co/2015/03/09/flask-on-iis/

Make sure the Python folder has IIS_IUSRS rights.  
Install all dependencies from requirements.txt globally or with virtualenv.  
To do this globally run the following line in the python script folder:  
```pip install -r requirements.txt```    
It is highly recommended that you set up your server with **https**  


## Importing data
Importing data is done by uploading sensors and observations as csv files. See csv_examples.  
Use [Curl](https://curl.haxx.se/), [Postman](https://chrome.google.com/webstore/detail/postman/fhbjgbiflinjbdggehcddcbncdddomop) or similar tools for this.   
Set Content-Type to "multipart/form-data" and use the form name "csv".  
Example uploading networks with curl  
```
curl -X POST -u usr:psw --form "csv=@path/to/sensors.csv" https://someurl.com/imports/sensors
```
If you upload a content with id's that exists, it will be updated.  
  
There are dependencies between the csv files, so the import order is important.  
Start with sensors and observations

### Security  
This application uses basic authentication.  
The default user:password combination is admin:admin  
It is recommended to change the default password immediately.   
You can do this with the user management module on pollenviz web site.