update

consul/discovery.go

@@ -0,0 +1,132 @@
+package consul
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+	"time"
+
+	consul "github.com/hashicorp/consul/api"
+)
+
+type Service struct {
+	AppID       string
+	Name        string
+	Address     string
+	IP          string
+	Port        int
+	TTL         time.Duration
+	ConsulAgent *consul.Agent
+}
+
+var ErrServiceUnavailable = fmt.Errorf("Service is unavailable")
+
+func NewService(serverAddr, appID, appName, ip, domain string, appPort int) (*Service, error) {
+	s := new(Service)
+	s.AppID = appID
+	s.Name = appName
+	s.Address = domain
+	s.IP = ip
+	s.Port = appPort
+	s.TTL = time.Second * 15
+
+	client, err := consul.NewClient(newClientConfig(serverAddr))
+	if err != nil {
+		return nil, err
+	}
+	s.ConsulAgent = client.Agent()
+
+	return s, nil
+}
+
+func newClientConfig(serverAddr string) *consul.Config {
+	conf := consul.DefaultConfig()
+	conf.Address = serverAddr
+
+	return conf
+}
+
+func (s *Service) Register() error {
+	def := &consul.AgentServiceRegistration{
+		ID:      s.Name + "_" + s.AppID,
+		Name:    s.Name,
+		Address: s.IP,
+		Port:    s.Port,
+		Tags:    s.getTags(),
+		Check: &consul.AgentServiceCheck{
+			TTL: s.TTL.String(),
+		},
+	}
+
+	if err := s.ConsulAgent.ServiceRegister(def); err != nil {
+		return err
+	}
+	go s.UpdateTTL(def)
+
+	return nil
+}
+func (s *Service) Unregister() error {
+	return s.ConsulAgent.ServiceDeregister(s.Name + "_" + s.AppID)
+}
+
+func (s *Service) UpdateTTL(service *consul.AgentServiceRegistration) {
+	ticker := time.NewTicker(s.TTL / 2)
+	for range ticker.C {
+		ok, err := s.check()
+		if !ok {
+			if err := s.ConsulAgent.FailTTL("service:"+s.Name+"_"+s.AppID, err.Error()); err != nil {
+				log.Println(err)
+			}
+		} else {
+			if err := s.ConsulAgent.PassTTL("service:"+s.AppID, "OK"); err != nil {
+				log.Println(err)
+			}
+		}
+	}
+}
+
+func (s *Service) check() (bool, error) {
+	client := &http.Client{}
+	healthUrl := fmt.Sprintf("http://%s:%d/health", s.IP, s.Port)
+	req, err := http.NewRequest(http.MethodGet, healthUrl, nil)
+	if err != nil {
+		return false, ErrServiceUnavailable
+	}
+	req.Header.Set("User-Agent", "Health Check")
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return false, ErrServiceUnavailable
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == http.StatusOK {
+		return true, nil
+	}
+
+	return false, ErrServiceUnavailable
+}
+
+func (s *Service) getTags() []string {
+	fullName := fmt.Sprintf("%s-%s", s.Name, s.AppID)
+	bFullAddr := fmt.Sprintf("http://%s:%d/", s.IP, s.Port) // FIXME: declare one once - dont need to refresh....
+
+	tags := []string{
+		"traefik.enable=true",
+		"traefik.http.routers." + s.Name + ".rule=Host(`" + s.Address + "`)",
+		"traefik.http.routers." + s.Name + ".entryPoints=https",
+		"traefik.http.routers." + s.Name + ".service=" + s.Name,
+		"traefik.http.routers." + s.Name + ".middlewares=compress,requestid",
+		"traefik.http.routers." + s.Name + ".tls=true",
+		// "traefik.http.services." + s.Name + ".loadbalancer.server.scheme=http",
+		// "traefik.http.services." + s.Name + ".loadbalancer.server.port=" + port,
+		"traefik.http.services." + s.Name + ".loadbalancer.passhostheader=false",
+		"traefik.http.services." + s.Name + ".loadbalancer.servers." + fullName + ".url=" + bFullAddr,
+		"traefik.http.middlewares.compress.compress=true",
+		"traefik.http.middlewares.requestid.plugin.requestid.headerName=X-Request-ID",
+		// "traefik.http.services." + fullName + ".loadbalancer.healthcheck.path=/health",
+		// "traefik.http.services." + fullName + ".loadbalancer.healthcheck.interval=10s",
+	}
+
+	return tags
+}

fluentd/config.go

@@ -0,0 +1,14 @@
+package fluentd
+
+import (
+	"strconv"
+	"strings"
+)
+
+func ParseAddr(addr string) (string, int) {
+	p := strings.Split(addr, ":")
+	fHost := p[0]
+	fPort, _ := strconv.Atoi(p[1])
+
+	return fHost, fPort
+}

fluentd/logger.go

@@ -0,0 +1,41 @@
+package fluentd
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/fluent/fluent-logger-golang/fluent"
+)
+
+type Logger struct {
+	fluent  *fluent.Fluent
+	appName string
+}
+
+func NewLogger(appName, fHost string, fPort int) *Logger {
+	config := fluent.Config{
+		FluentHost: fHost,
+		FluentPort: fPort,
+		// WriteTimeout: -1,
+	}
+	fluent, err := fluent.New(config)
+	if err != nil {
+		log.Panicf("Error connecting to %s: %v", fHost, err)
+	}
+
+	return &Logger{fluent, appName}
+}
+
+func (l *Logger) Log(format string, v ...any) {
+	mapData := map[string]string{
+		"message": fmt.Sprintf(format, v...),
+	}
+	err := l.fluent.Post(l.appName, mapData)
+	if err != nil {
+		log.Println("Error sending log: ", err)
+	}
+}
+
+func (l *Logger) Close() error {
+	return l.fluent.Close()
+}

rabbitmq/queue.go

@@ -0,0 +1,85 @@
+package rabbitmq
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"log"
+
+	"github.com/streadway/amqp"
+)
+
+type Message map[string]interface{}
+
+func Serialize(msg any) (string, error) {
+	var b bytes.Buffer
+	encoder := json.NewEncoder(&b)
+	err := encoder.Encode(msg)
+
+	return b.String(), err
+}
+
+func Deserialize(b []byte) (Message, error) {
+	var msg Message
+	buf := bytes.NewBuffer(b)
+	decoder := json.NewDecoder(buf)
+	err := decoder.Decode(&msg)
+
+	return msg, err
+}
+
+func NewExchange(chn *amqp.Channel, name string) error {
+	err := chn.ExchangeDeclare(
+		name,
+		"direct", // type
+		true,     // durable
+		false,    // auto-deleted
+		false,    // internal
+		false,    // no-wait
+		nil,      // arguments
+	)
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func Publish(chn *amqp.Channel, name, routingKey string, msg any) error {
+	jsonData, err := Serialize(msg)
+	if err != nil {
+		return err
+	}
+
+	msgBody := fmt.Sprintf(`{"event":"%T","data":%s}`, msg, jsonData)
+	chn.Publish(
+		name,       // exchange name
+		routingKey, // routing key
+		false,      // mandatory
+		false,      // immediate
+		amqp.Publishing{
+			ContentType: "application/json",
+			Body:        []byte(msgBody),
+		},
+	)
+
+	return nil
+}
+
+func BindQueueToExchange(chn *amqp.Channel, queueName, exchName, routingKey string) error {
+	err := chn.QueueBind(
+		queueName,  // queue name
+		routingKey, // routing key
+		exchName,   // exchange name
+		false,
+		nil,
+	)
+	if err != nil {
+		log.Printf("Failed to bind a queue: %s\n", queueName)
+
+		return err
+	}
+
+	return nil
+}