#!/bin/bash
if [[ $(whoami) != 'root' ]]; then
    echo "Please execute this script as root! Exiting...";
    exit 0;
fi

echo "Minimalistic installer for grafana stack v3.0";
echo "New: service files";
echo "";

grafana=10.4.2
node=1.8.0
prometheus=2.51.2
loki=3.0.0
mysqlv=0.15.1

cd /srv
mkdir loki
mkdir exportermysql
mkdir promtail

echo "Downloading mysqld_exporter"
wget -qO- https://github.com/prometheus/mysqld_exporter/releases/download/v$mysqlv/mysqld_exporter-$mysqlv.linux-amd64.tar.gz | tar -xzO mysqld_exporter-$mysqlv.linux-amd64/mysqld_exporter > /srv/exportermysql/mysqld_exporter
echo '[client]
user=mysqlexporter
password=abc123' > /srv/exportermysql/mysqld_exporter.cnf

echo "Downloading prometheus"
wget -qO- https://github.com/prometheus/prometheus/releases/download/v$prometheus/prometheus-$prometheus.linux-amd64.tar.gz | tar -xz
mv prometheus-$prometheus.linux-amd64 prometheus
echo "global:
  scrape_interval:     15s
  evaluation_interval: 15s
scrape_configs:
  - job_name: prometheus
    static_configs:
      - targets: ['127.0.0.1:9090']
  - job_name: grafana
    static_configs:
      - targets: ['127.0.0.1:3000']
  - job_name: linux
    static_configs:
      - targets: ['127.0.0.1:9100']
  - job_name: loki
    static_configs:
      - targets: ['127.0.0.1:3100']" > /srv/prometheus/prometheus.yml

echo "Downloading mysqld_exporter"
cd /srv
wget -qO- https://github.com/prometheus/node_exporter/releases/download/v$node/node_exporter-$node.linux-amd64.tar.gz | tar -xz
mv node_exporter-$node.linux-amd64 exporternode

echo "Downloading loki"
cd /srv/loki
wget -q https://github.com/grafana/loki/releases/download/v$loki/loki-linux-amd64.zip
unzip -q loki-linux-amd64.zip
wget -q https://raw.githubusercontent.com/grafana/loki/main/cmd/loki/loki-local-config.yaml -O loki.yaml
rm loki-linux-amd64.zip

echo "Downloading promtail"
cd /srv/promtail
wget -q https://github.com/grafana/loki/releases/download/v$loki/promtail-linux-amd64.zip
unzip -q promtail-linux-amd64.zip
rm promtail-linux-amd64.zip
echo "server:
  disable: true

clients:
  - url: http://localhost:3100/loki/api/v1/push

positions:
  filename: ./positions.yml

scrape_configs:
- job_name: myapp
  static_configs:
  - targets:
      - localhost
    labels:
      app: myapp
      __path__: /srv/myapp/myapp.log
" > /srv/promtail/promtail_config.yaml

echo "Downloading grafana"
cd /srv
wget -qO- https://dl.grafana.com/enterprise/release/grafana-enterprise-$grafana.linux-amd64.tar.gz | tar -xz
mv grafana-v$grafana grafana

# Setting permissions
chown -R root:root /srv/prometheus /srv/grafana /srv/exportermysql /srv/exporternode /srv/loki /srv/promtail

# Service files
echo "Creating service files"
cd /etc/systemd/system/
wget -q https://shira.at/stash/grafana/exportermysql.service
wget -q https://shira.at/stash/grafana/exporternode.service
wget -q https://shira.at/stash/grafana/grafana.service
wget -q https://shira.at/stash/grafana/loki.service
wget -q https://shira.at/stash/grafana/prometheus.service
wget -q https://shira.at/stash/grafana/promtail.service

systemctl daemon-reload


echo "Starting services node_exporter,grafana,loki,prometheus"
systemctl enable --now exporternode
systemctl enable --now loki
systemctl enable --now prometheus
systemctl enable --now grafana

echo ""

echo "Please change the config of promtail and mysqld_exporter"
echo "Then start them with systemctl start <name>"

cd /srv
wget -q https://shira.at/stash/grafana/_create_default_datasources.sh.txt -O _create_datasources.sh
chmod +x _create_datasources.sh
echo "To create the loki/prometheus datasources use ./_create_datasources.sh"
echo "To import a basic node_exporter dashboard import the ID 1860"