res_levis_backend/internal/pkg/controller/parser_controller.go

package controller

import (
	"context"
	"encoding/json"
	"fmt"
	"log/slog"
	"net/http"

	"github.com/AFASystems/presence/internal/pkg/model"
	"github.com/AFASystems/presence/internal/pkg/service"
	"github.com/gorilla/mux"
	"github.com/segmentio/kafka-go"
	"gorm.io/gorm"
)

func ParserAddController(db *gorm.DB, writer *kafka.Writer, ctx context.Context) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		decoder := json.NewDecoder(r.Body)
		var config model.Config

		if err := decoder.Decode(&config); err != nil {
			http.Error(w, err.Error(), 400)
			return
		}

		db.Create(&config)

		kp := model.KafkaParser{
			ID:     "add",
			Config: config,
		}

		if err := service.SendParserConfig(kp, writer, ctx); err != nil {
			http.Error(w, "Unable to send parser config to kafka broker", 400)
			msg := fmt.Sprintf("Unable to send parser config to kafka broker %v", err)
			slog.Error(msg)
			return
		}

		w.Write([]byte("ok"))
	}
}

func ParserListController(db *gorm.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var configs []model.Config
		db.Find(&configs)
		res, err := json.Marshal(configs)
		if err != nil {
			http.Error(w, err.Error(), 400)
			return
		}

		w.Write(res)
	}
}

func ParserDeleteController(db *gorm.DB, writer *kafka.Writer, ctx context.Context) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		id := mux.Vars(r)["id"]
		if res := db.Delete(&model.Config{}, "name = ?", id); res.RowsAffected == 0 {
			http.Error(w, "no parser config with such name found", 400)
			return
		}

		kp := model.KafkaParser{
			ID:   "delete",
			Name: id,
		}

		if err := service.SendParserConfig(kp, writer, ctx); err != nil {
			http.Error(w, "Unable to send parser config to kafka broker", 400)
			msg := fmt.Sprintf("Unable to send parser config to kafka broker %v", err)
			slog.Error(msg)
			return
		}

		w.Write([]byte("ok"))
	}
}

func ParserUpdateController(db *gorm.DB, writer *kafka.Writer, ctx context.Context) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		id := mux.Vars(r)["id"]

		if err := db.First(&model.Config{}, "name = ?", id).Error; err != nil {
			http.Error(w, err.Error(), 400)
			return
		}

		decoder := json.NewDecoder(r.Body)
		var config model.Config

		if err := decoder.Decode(&config); err != nil {
			http.Error(w, err.Error(), 400)
			return
		}

		kp := model.KafkaParser{
			ID:     "update",
			Name:   config.Name,
			Config: config,
		}

		db.Save(&config)
		if err := service.SendParserConfig(kp, writer, ctx); err != nil {
			http.Error(w, "Unable to send parser config to kafka broker", 400)
			msg := fmt.Sprintf("Unable to send parser config to kafka broker %v", err)
			slog.Error(msg)
			return
		}

		w.Write([]byte("ok"))
	}
}