Moved new postgres implementation to v2 folder, also added nil check for db object in postgres config

postgres/v2/config.go

@@ -0,0 +1,55 @@
+package v2
+
+import (
+	"github.com/jackc/pgx/pgxpool"
+	"time"
+)
+
+// Config defines the config for storage.
+type Config struct {
+	// Db pgxpool.Pool object
+	//
+	// Required
+	Db pgxpool.Pool
+
+	// Table name
+	//
+	// Optional. Default is "fiber_storage"
+	Table string
+
+	// Reset clears any existing keys in existing Table
+	//
+	// Optional. Default is false
+	Reset bool
+
+	// Time before deleting expired keys
+	//
+	// Optional. Default is 10 * time.Second
+	GCInterval time.Duration
+}
+
+// ConfigDefault is the default config
+var ConfigDefault = Config{
+	Table:      "fiber_storage",
+	Reset:      false,
+	GCInterval: 10 * time.Second,
+}
+
+// Helper function to set default values
+func configDefault(config ...Config) Config {
+	// Return default config if nothing provided
+	if len(config) < 1 {
+		return ConfigDefault
+	}
+	// Override default config
+	cfg := config[0]
+
+	// Set default values
+	if cfg.Table == "" {
+		cfg.Table = ConfigDefault.Table
+	}
+	if int(cfg.GCInterval.Seconds()) <= 0 {
+		cfg.GCInterval = ConfigDefault.GCInterval
+	}
+	return cfg
+}