// Aula 12 - Criando uma HTTP Service Discovery

# dnf install python3-pip

# pip install flask

# vim httpsd.py

from flask import Flask, jsonify, request

app = Flask(__name__)

servicos = [
    {
        "targets": ["10.0.10.2:9100", "10.0.10.3:9100", "10.0.10.4:9100", "10.0.10.5:9100"],
        "labels": {
            "__meta_datacenter": "sao paulo",
            "__meta_prometheus_job": "node"
        }
    },
    {
        "targets": ["10.0.40.2:9100", "10.0.40.3:9100"],
        "labels": {
            "__meta_datacenter": "campinas",
            "__meta_prometheus_job": "alertmanager"
        }
    },
    {
        "targets": ["10.0.40.2:9093", "10.0.40.3:9093"],
        "labels": {
            "__meta_datacenter": "fortaleza",
            "__meta_prometheus_job": "alertmanager"
        }
    }
]

@app.route('/servicos', methods=['GET'])
def listar_servicos():
    return jsonify(servicos)

@app.route('/servicos', methods=['POST'])
def adicionar_servico():
    novo_servico = request.json
    servicos.append(novo_servico)
    return jsonify(novo_servico)

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8080)

# firewall-cmd --add-port=8080/tcp --permanent

# firewall-cmd --reload

# vim /etc/systemd/system/servidorsd.service

[Unit]
Description=Servidor Flask para SD HTTP

[Service]
User=root
WorkingDirectory=/root/
ExecStart=/usr/bin/python3 /root/httpsd.py
Restart=always

[Install]
WantedBy=multi-user.target

# sudo systemctl daemon-reload

# systemctl enable --now servidorsd

# sudo systemctl status servidorsd

# ss -altnp | grep 8080

# vim /etc/prometheus/prometheus.yml

  - job_name: httpsd
    metrics_path: /servicos
    http_sd_configs:
      - url: http://192.168.15.141:8080/servicos

# systemctl restart prometheus