Chinet Block Explorer consists of two parts.

1. Frontend, An angular application, compile and served by nginx
2. Backend, A nodejs express api and websocket server.

---

Obtain the source

git clone https://github.com/chinet-project/chinet-explorer.git && cd chinet-explorer

Install the NodeJS dependencies for the Backend and Frontend

npm install

Frontend

Angular application is compiled into a set of minified js files that reside the build directory, these file should be transfered to your nginx directory for serving.

The following files source/environments.ts and source/environments.prod.ts are configuration file for debug and production builds

export const environment = {
  production: false,
  backend: 'https://api.chinet.io',
  documentionApi: 'https://docs.chinet.io',
  decimalPlaces: 2,
  initialChartLoadDelayMs: 5000,
  frequencyOfChartRefreshingMs: 3600000,
  enableVisibilityInfo: true
};

1. backend FQDN of your backend with the frontEnd_api
2. documentationApi Address used to build documentation explanations
3. decimalPlaces how many decimal places to use when displaying currency
4. initialChartLoadDelayMs how many milliseconds to wait after the app loads before attempting to fill the chart cache
5. frequencyOfChartRefreshingMs how often the chart cache should be refresh, currently 1 hour
6. enableVisibilityInfo show the dev fund wallet information

Once you have adjusted the configuration files to your needs, issue the following command to build the minified js files.

npm run 'build prod'

If you prefer to run the site in developer mode issue the following command.

ng serve -o

---

Backend Server

The following file contains all the configuration setting required to run your Backend, Edit config.json

{
    "api":"http://127.0.0.1:11211",
    "frontEnd_api": "http://127.0.0.1:4200",
    "server_port": "8008",
    "auditable_wallet": {
        "api": "http://127.0.0.1:12233"
    },
    "enableVisibilityInfo": true,
    "database": {
        "user": "chinet_explorer",
        "host": "127.0.0.1",
        "port": 5432,
        "database": "db",
        "password": "123456"
    }

1. "api" The address of your chinet node.
2. "frontEnd_api" The address of the angular uses for CORS. seems to not like 127.0.0.1
3. "server_port" Port of backend API used by angular to obtain data.
4. "auditable_wallet" FDQN of your auditable wallet running as a service.
5. "database" credentials and location of a postgresql database
6. enableVisibilityInfo stop/start websocket emitting dev fund wallet information

Once the postgresql database is installed, schema, tables, stored procedures and permissions configurated on the database, you should begin to synchronize chinet node information to the database. this process takes around 10hrs

Issue the following command to Run the Backend Server.

node server-pg.js

Dependencies Required to run block explorer

Chinet Node

Follow the instructions to clone and build a chinet node and simple wallet

CHN

Run a node

./chinetd

Create a wallet

./simplewallet --generate-new-wallet my_new_wallet

Run simplewallet as a server. blockexplorer dislays wallet balance and staking information.

./simplewallet --wallet-file my_new_wallet --password 123456 --rpc-bind-ip 127.0.0.1 --rpc-bind-port 12233 --daemon-address 127.0.0.1:11211

Create a new Non root User

sudo -u createuser chinet_explorer

Add new User to the sudoers group

sudo usermod -aG sudo chinet_explorer

Postgresql

helpful postgresql commands

1. \q quit the psql shell
2. \l list available databases
3. \c [database] connect to a database
4. \dt list available tables in the database after you connected \c [database]

Update your system and install packages

sudo apt update && sudo apt install postgresql postgresql-contrib \
sudo systemctl start postgresql

Login to database as postgres user and add new user chinet_explorer role for postgres

sudo -u postgres psql
CREATE ROLE chinet_explorer LOGIN SUPERUSER;

Create a new database

CREATE DATABASE db;

Run the database.sql script to create the tables, stored procedures and grant permissions to these database objects for the chinet_explorer user

psql -f database.sql

If you intend to run Backend and postgresql on different servers you will need to configure postgresql for remote access. Once configured for remote access you will also need to install pgAdmin4 to administer your database remotely.

Configure postgresql for remote access.

Edit postgresql.conf

sudo nano /etc/postgresql/13/main/postgresql.config

locate the entry #list_address = 'localhost' uncomment and change to listen_address = '*'. This will configure postgresql to listen on all ports.

---

Edit pg_hba.conf and add a new line to the bottom of the file

NOTE: For Security reasons you should never use 0.0.0.0/0, limit to an IP address or to a Subnet.

# TYPE  DATABASE    USER    ADDRESS       METHOD
host    all         all     10.0.0.15/24     md5

If you use UFW Open the firewall port to allow remote connections to port 5432

sudo ufw allow 5432/tcp

4. Restart Postgresql Service

sudo systemctl restart postgresql

Install pgAdmin4 postgresql tool on client machine [not neccessary if you administer locally]

Update Ubuntu repositories

$ curl https://www.pgadmin.org/static/packages_pgadmin_org.pub | sudo apt-key add
$ sudo sh -c 'echo "deb https://ftp.postgresql.org/pub/pgadmin/pgadmin4/apt/$(lsb_release -cs) pgadmin4 main" > /etc/apt/sources.list.d/pgadmin4.list && apt update'

Install pgAdmin4 on remote machine you intend to administer the database from.

sudo apt install pgadmin4

Start pgAdmin4

1. create a connection to your server, provide a master password
2. connect to your server with the role created previously

username: chinet_explorer

password: 123456

3. Right click Database and select create Database
4. From the toolbar select query tool
5. In the query editor open file and select database.sql
6. Run the query to create the db tables, stored procedures and permissions necessary to run block_explorer

Nginx Setup

Instal nginx >= 1.4 and certbot

sudo apt update && sudo apt install nginx certbot

2. Start Nginx

sudo systemctl nginx start

Create site configuration

sudo nano /etc/nginx/sites-available/api.chinet.io

server {
    server_name api.chinet.io;
    gzip on;
    gzip_types *;
    gzip_min_length 1000;
    
    # Set files location
    root /var/www/block-explorer/dist/;
    index index.html;

    location ~ ^/(.*) {
        proxy_pass http://127.0.0.1:8008/$1$is_args$args;
        proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;

        #wss requires nginx 1.4
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";

    }
}

server {
    listen 80;
    server_name api.chinet.io;
}