Initial commit

db/db.go

@@ -0,0 +1,192 @@
+package db
+
+import (
+	"database/sql"
+	"encoding/json"
+	"errors"
+	"log"
+
+	"git.beisel.it/florian/hostname-service/models"
+	"github.com/golang-migrate/migrate/v4"
+	_ "github.com/golang-migrate/migrate/v4/database/sqlite3"
+	_ "github.com/golang-migrate/migrate/v4/source/file"
+	_ "github.com/mattn/go-sqlite3"
+	"golang.org/x/crypto/bcrypt"
+)
+
+var DB *sql.DB
+
+// Initialize the database and create tables if they don't exist
+func Init() {
+	var err error
+	DB, err = sql.Open("sqlite3", "hostname-service.db")
+	if err != nil {
+		log.Fatalf("Error opening database: %v", err)
+	}
+
+	m, err := migrate.New(
+		"file://db/migrations/",
+		"sqlite3://hostname-service.db",
+	)
+
+	if err != nil {
+		log.Fatalf("Migration initialization failed: %v", err)
+	}
+
+	// Apply all up migrations
+	if err := m.Up(); err != nil && err != migrate.ErrNoChange {
+		log.Fatalf("Migration up failed: %v", err)
+	}
+
+	// Check if users table is empty
+	var userCount int
+	err = DB.QueryRow("SELECT COUNT(*) FROM users").Scan(&userCount)
+	if err != nil {
+		log.Fatalf("Error checking users table: %v", err)
+	}
+
+	// If there are no users, create a default admin user
+	if userCount == 0 {
+		hashedPassword, err := bcrypt.GenerateFromPassword([]byte("defaultPassword"), bcrypt.DefaultCost)
+		if err != nil {
+			log.Fatalf("Error hashing password: %v", err)
+		}
+
+		_, err = DB.Exec("INSERT INTO users (username, password) VALUES (?, ?)", "admin", string(hashedPassword))
+		if err != nil {
+			log.Fatalf("Error creating default admin user: %v", err)
+		}
+
+		log.Println("Default admin user created")
+	}
+
+	log.Println("Database migrations applied successfully")
+}
+
+func CreateUser(user *models.User) error {
+	statement, err := DB.Prepare("INSERT INTO users(username, password) VALUES (?, ?)")
+	if err != nil {
+		return err
+	}
+	_, err = statement.Exec(user.Username, user.Password)
+	return err
+}
+
+func InsertHostname(category string, hostname string, paramsJSON []byte) error {
+	_, err := DB.Exec("INSERT INTO hostnames (category, hostname, parameters) VALUES (?, ?, ?)", category, hostname, paramsJSON)
+	if err != nil {
+		log.Printf("Error inserting hostname into DB: %v", err)
+		return err
+	}
+	return nil
+}
+
+func UpdateHostname(category string, oldhostname string, hostname string, paramsJSON []byte) error {
+	_, err := DB.Exec("UPDATE hostnames set category = ?, hostname =?, parameters =? where category = ? and hostname = ?", category, hostname, paramsJSON, category, oldhostname)
+	if err != nil {
+		log.Printf("Error inserting hostname into DB: %v", err)
+		return err
+	}
+	return nil
+}
+
+func DeleteHostname(category string, hostname string) error {
+	log.Printf("Soft-Deleting hostname: %v in category: %v", category, hostname)
+	_, err := DB.Exec("UPDATE hostnames set deleted = true where category = ? and hostname = ?", category, hostname)
+	if err != nil {
+		log.Printf("Error deleting hostname from DB: %v", err)
+		return err
+	}
+	return nil
+}
+
+// HostnameExists checks if a hostname exists within a given category
+func HostnameExists(category string, hostname string) (bool, error) {
+	var exists bool
+
+	query := "SELECT EXISTS(SELECT 1 FROM hostnames WHERE category = ? AND hostname = ?)"
+	err := DB.QueryRow(query, category, hostname).Scan(&exists)
+	if err != nil {
+		if err == sql.ErrNoRows {
+			// No rows found, meaning the hostname does not exist
+			return false, nil
+		}
+		// An actual error occurred
+		return false, err
+	}
+
+	return exists, nil
+}
+
+func GetMaxNumberForCategory(category string) (int, error) {
+	var maxResult sql.NullInt64
+	err := DB.QueryRow("SELECT MAX(CAST(json_extract(parameters, '$.Number') AS INTEGER)) FROM hostnames WHERE category = ?", category).Scan(&maxResult)
+	if err != nil {
+		log.Printf("Error querying max number for category %s: %v", category, err)
+		return 0, err
+	}
+	if !maxResult.Valid {
+		return 0, nil // No rows found, start with 0
+	}
+	return int(maxResult.Int64), nil
+}
+
+func GetHostnamesByCategory(category string) ([]models.Hostname, error) {
+	var hostnames []models.Hostname
+
+	rows, err := DB.Query("SELECT id, category, hostname, parameters, created_at FROM hostnames WHERE category = ? and deleted = false", category)
+	if err != nil {
+		log.Printf("Error querying hostnames: %v", err)
+		return nil, err
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		var h models.Hostname
+		var paramsJSON string
+		err := rows.Scan(&h.ID, &h.Category, &h.Hostname, &paramsJSON, &h.CreatedAt)
+		if err != nil {
+			log.Printf("Error scanning hostname: %v", err)
+			return nil, err
+		}
+		// Unmarshal parameters JSON
+		err = json.Unmarshal([]byte(paramsJSON), &h.Parameters)
+		if err != nil {
+			log.Printf("Error unmarshaling parameters: %v", err)
+			return nil, err
+		}
+		hostnames = append(hostnames, h)
+	}
+
+	return hostnames, nil
+}
+
+func GetHostnameByCategoryAndName(category string, hostname string) (models.Hostname, error) {
+	var host models.Hostname
+	var paramsJSON string
+
+	row, err := DB.Query("SELECT id, category, hostname, parameters, created_at FROM hostnames where category = ? and hostname = ? and deleted = false", category, hostname)
+	if err != nil {
+		log.Printf("Error querying hostname: %v", err)
+		return models.Hostname{}, err
+	}
+	defer row.Close()
+
+	if !row.Next() {
+		log.Printf("no rows found for category %s and hostname %s", category, hostname)
+		return models.Hostname{}, errors.New("no rows found")
+	}
+
+	err = row.Scan(&host.ID, &host.Category, &host.Hostname, &paramsJSON, &host.CreatedAt)
+	if err != nil {
+		log.Printf("Error scanning hostname: %v", err)
+		return models.Hostname{}, err
+	}
+	err = json.Unmarshal([]byte(paramsJSON), &host.Parameters)
+	if err != nil {
+		log.Printf("Error unmarshaling parameters: %v", err)
+		return models.Hostname{}, nil
+	}
+
+	return host, nil
+}

db/migrations/1_create_users_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS users;

db/migrations/1_create_users_table.up.sql

@@ -0,0 +1,5 @@
+CREATE TABLE IF NOT EXISTS users (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    username TEXT NOT NULL UNIQUE,
+    password TEXT NOT NULL
+);

db/migrations/2_create_hostnames_table.down.sql

@@ -0,0 +1 @@
+DROP TABLE IF EXISTS hostnames;

db/migrations/2_create_hostnames_table.up2.sql

@@ -0,0 +1,7 @@
+CREATE TABLE hostnames (
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    category TEXT NOT NULL,
+    hostname TEXT NOT NULL,
+    parameters JSON,  
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);

db/migrations/3_alter_hostnames_add_deleted.down.sql

@@ -0,0 +1,2 @@
+ALTER TABLE hostnames
+DROP COLUMN deleted;

db/migrations/3_alter_hostnames_add_deleted.up.sql

@@ -0,0 +1,2 @@
+ALTER TABLE hostnames
+ADD COLUMN deleted BOOLEAN DEFAULT FALSE;