start: add a first db in golang

Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>

cmd/db/main.go

@@ -0,0 +1,184 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"git.g3e.fr/syonad/two/pkg/db/kv"
+	"github.com/dgraph-io/badger/v4"
+)
+
+var DB *badger.DB
+
+func CheckInDB(dbName, id string) int {
+	prefix := []byte(dbName + "/bash/")
+	key := []byte(dbName + "/bash/" + id)
+
+	// vérifier si DB contient au moins une entrée avec ce préfixe
+	hasPrefix := false
+
+	DB.View(func(txn *badger.Txn) error {
+		it := txn.NewIterator(badger.DefaultIteratorOptions)
+		defer it.Close()
+		it.Seek(prefix)
+		if it.ValidForPrefix(prefix) {
+			hasPrefix = true
+		}
+		return nil
+	})
+
+	if !hasPrefix {
+		return 1
+	}
+
+	// vérifier si la clé existe
+	err := DB.View(func(txn *badger.Txn) error {
+		_, err := txn.Get(key)
+		return err
+	})
+
+	if err == badger.ErrKeyNotFound {
+		return 2
+	}
+
+	return 0
+}
+
+func AddInDB(dbName string, line string) error {
+	// ID = partie avant le premier ';'
+	id := strings.Split(line, ";")[0]
+	key := []byte(dbName + "/bash/" + id)
+
+	return DB.Update(func(txn *badger.Txn) error {
+		return txn.Set(key, []byte(line))
+	})
+}
+
+func DeleteInDB(dbName, id string) error {
+	key := []byte(dbName + "/bash/" + id)
+
+	return DB.Update(func(txn *badger.Txn) error {
+		return txn.Delete(key)
+	})
+}
+
+func CountInDB(dbName, id string) int {
+	prefix := []byte(dbName + "/bash/" + id)
+	count := 0
+
+	DB.View(func(txn *badger.Txn) error {
+		it := txn.NewIterator(badger.DefaultIteratorOptions)
+		defer it.Close()
+
+		for it.Seek(prefix); it.ValidForPrefix(prefix); it.Next() {
+			count++
+		}
+		return nil
+	})
+
+	return count
+}
+
+func GetFromDB(dbName, id string) (string, error) {
+	key := []byte(dbName + "/bash/" + id)
+
+	var result string
+
+	err := DB.View(func(txn *badger.Txn) error {
+		item, err := txn.Get(key)
+		if err != nil {
+			return err
+		}
+		return item.Value(func(val []byte) error {
+			result = string(val)
+			return nil
+		})
+	})
+
+	return result, err
+}
+
+func printDB() {
+	err := DB.View(func(txn *badger.Txn) error {
+		it := txn.NewIterator(badger.DefaultIteratorOptions)
+		defer it.Close()
+
+		for it.Rewind(); it.Valid(); it.Next() {
+			item := it.Item()
+			key := item.Key()
+			err := item.Value(func(val []byte) error {
+				fmt.Printf("%s:%s\n", string(key), string(val))
+				return nil
+			})
+			if err != nil {
+				return err
+			}
+		}
+		return nil
+	})
+
+	if err != nil {
+		fmt.Println("Error reading DB:", err)
+	}
+}
+
+func main() {
+	DB = kv.InitDB()
+	defer DB.Close()
+
+	printDB()
+
+	if len(os.Args) < 2 {
+		fmt.Println("Usage: db <cmd> [args...]")
+		return
+	}
+
+	cmd := os.Args[1]
+
+	switch cmd {
+	case "check_in_db":
+		if len(os.Args) != 4 {
+			fmt.Println("Usage: check_in_db <db_name> <id>")
+			os.Exit(1)
+		}
+		ret := CheckInDB(os.Args[2], os.Args[3])
+		os.Exit(ret)
+	case "add_in_db":
+		if len(os.Args) < 4 {
+			fmt.Println("Usage: add_in_db <db_name> <line...>")
+			os.Exit(1)
+		}
+		line := strings.Join(os.Args[3:], ";")
+		if err := AddInDB(os.Args[2], line); err != nil {
+			fmt.Println("Error:", err)
+			os.Exit(1)
+		}
+	case "delete_in_db":
+		if len(os.Args) != 4 {
+			fmt.Println("Usage: delete_in_db <db_name> <id>")
+			os.Exit(1)
+		}
+		if err := DeleteInDB(os.Args[2], os.Args[3]); err != nil {
+			fmt.Println("Error:", err)
+			os.Exit(1)
+		}
+	case "count_in_db":
+		if len(os.Args) != 4 {
+			fmt.Println("Usage: count_in_db <db_name> <id>")
+			os.Exit(1)
+		}
+		count := CountInDB(os.Args[2], os.Args[3])
+		fmt.Println(count)
+	case "get_from_db":
+		if len(os.Args) != 4 {
+			fmt.Println("Usage: get_from_db <db_name> <id>")
+			os.Exit(1)
+		}
+		line, _ := GetFromDB(os.Args[2], os.Args[3])
+		fmt.Println(line)
+	default:
+		fmt.Println("Unknown command:", cmd)
+		os.Exit(1)
+	}
+}

go.mod

@@ -1,3 +1,21 @@
 module git.g3e.fr/syonad/two
 
 go 1.23.8
+
+require (
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/dgraph-io/badger/v4 v4.8.0 // indirect
+	github.com/dgraph-io/ristretto/v2 v2.2.0 // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
+	github.com/go-logr/logr v1.4.3 // indirect
+	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/google/flatbuffers v25.2.10+incompatible // indirect
+	github.com/klauspost/compress v1.18.0 // indirect
+	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
+	go.opentelemetry.io/otel v1.37.0 // indirect
+	go.opentelemetry.io/otel/metric v1.37.0 // indirect
+	go.opentelemetry.io/otel/trace v1.37.0 // indirect
+	golang.org/x/net v0.41.0 // indirect
+	golang.org/x/sys v0.34.0 // indirect
+	google.golang.org/protobuf v1.36.6 // indirect
+)

pkg/db/kv/init.go

@@ -0,0 +1,19 @@
+package kv
+
+import (
+	"github.com/dgraph-io/badger/v4"
+)
+
+func InitDB() *badger.DB {
+	opts := badger.DefaultOptions("./data")
+	opts.Logger = nil
+	opts.ValueLogFileSize = 10 << 20 // 10 Mo par fichier vlog
+	opts.NumMemtables = 1
+	opts.NumLevelZeroTables = 1
+	opts.NumLevelZeroTablesStall = 2
+	db, err := badger.Open(opts)
+	if err != nil {
+		panic(err)
+	}
+	return db
+}