> It's recommended to fix security vulnerabilities in dependencies using the command.
```sh
$ npm audit fix
```
It is necessary to have installed mongodb locally in case of making a connection to another server modify the connection url of mongodb.
> Once the installation is done, it is necessary to create a database with three collections with the following names:
```sh
$ mongo
use DecaGraphics
db.createCollection("decaPrice")
db.createCollection("decaGeth")
db.createCollection("decaCCTS")
```
> After that it is necessary to set the environment variables in an .env file as in the example .envSample file.
```sh
APIKEY=
USERDB=
PASSDB=
DBNAME=
INFURAKEY=
CONTRACTADDRS=
```
In both scripts it is necessary to set the variable 'dates' to the following date in unixtime from there the script will start to run the calculations automatically.
**Once everything is configured it is necessary to have ipfs running as a service the configuration can be found in [carboncreditsbacklog](https://gitlab.com/deca-currency/carboncreditsbacklog) as well connecting to the nodes mentioned there in order to replicate the orbitdb carbon credits database bd.**
> The scripts can be tested using node as well the service rest which will take the data from mongodb and expose it in a json format in order to do the calculations on the web page
```sh
$ node scriptMainNode.js
$ node index.js
```
To verify the data can be done from a browser taking into account the use of cors or from a bash.
```sh
$ curl localhost:5000/decaPrice
$ curl localhost:5000/decaGeth
$ curl localhost:5000/decaCCTS
```
## Development
* The dependencies are already in the package.json
* Ethereum Node
* Bitcoinaverage Api
The rest service was made in express.js and cors was applied to accept only requests coming from deca.eco as well as helmet.js was used to give a better security to the application and the good practices of [express](https://expressjs.com/es/advanced/best-practice-security.html).
The main script is scriptMainNode.js performs the calculations found in the document [DECAAnalyticsETHPrice](./pdf/DECAAnalyticsETHPrice.pdf) the other script is backup and is used on another node in case the main one fails.
## Deploy
### Prerequisites
* Nginx >= 1.14.0
* Certbot >= 1.6
Install Nginx
```sh
$ sudo apt update
$ sudo apt install nginx
```
Install Certbot
```sh
$ sudo add-apt-repository ppa:certbot/certbot
```
> The script is configured as a service to be able to perform the calculations automatically. The configuration file is located in the service folder.
```sh
$ sudo vim /etc/systemd/system/decaGraphics.service
**NOTE: in this example user that runs ipfs, node and orbitdb instance is nodemaster, also the node location is at /usr/local/bin/node**
**NOTE1: set WorkingDirectory where is the repository, for this example /home/nodemaster/decagraphics/**
**NOTE2: set where is index.js mostly in the repository as follow path to node path, for this example /home/nodemaster/decagraphics/scriptMainNode.js**
> Enable the service
```sh
$ sudo systemctl daemon-reload
$ sudo systemctl enable decaGraphics.service
$ sudo systemctl start decaGraphics.service
$ sudo systemctl status decaGraphics.service
```
**NOTE: service must be set as active (running), if not please verify the preview steps**
> It is possible to check in the service logs if any error occurred in the service.
Once the service is working properly it is necessary to configure the service subtract to be able to access the data from [deca.eco](https://deca.eco/).
In the nginx config add the proxy pass
```sh
$ vim /etc/nginx/conf.d/example.com.conf
server {
listen 80 default_server;
listen [::]:80 default_server;
server_name example.com www.example.com;
root /var/www/example.com;
index index.html;
try_files $uri /index.html;
location / {
proxy_pass http://localhost:5000;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection 'upgrade';
proxy_set_header Host $host;
proxy_cache_bypass $http_upgrade;
}
}
```
**Remember to open the port in the firewall**
**Remember to leave the rest service running in a tmux session and check the port.**
**Now restart up Nginx!**
### Add SSL Certificate
```sh
$ sudo certbot --nginx -d api.deca.eco
```
**It is recommended to redirect all http traffic to https**
Finally renew the certificate with the following command and restart nginx
