feat(init): First commit

pkg/database/db.go

@@ -0,0 +1,74 @@
+package database
+
+import (
+	"fmt"
+
+	"git.maurice.fr/thomas/mailout/pkg/config"
+	"git.maurice.fr/thomas/mailout/pkg/models"
+	"gorm.io/driver/postgres"
+	"gorm.io/gorm"
+)
+
+const (
+	createViewRawSQL = `
+/*
+    This view basically returns to you the most recent key for
+    each known domain, so that when opendkim performs a where
+    filter on the result only one result will be returned.
+    Hence avoiding to make it confused and upset
+*/
+CREATE OR REPLACE VIEW signing_table AS
+    SELECT
+        k1.id,
+        k1.domain_name,
+        k1.created_at
+    FROM
+        dkimkeys AS k1
+    INNER JOIN
+        dkimkeys AS k2
+            ON
+                k1.created_at = (
+                    SELECT
+                        max(created_at)
+                    FROM
+                        dkimkeys
+                    WHERE
+                        domain_name = k1.domain_name
+                        AND k1.active   = true
+                )
+            WHERE k1.domain_name = k2.domain_name
+            AND k1.created_at    = k2.created_at;
+`
+)
+
+func NewDB(cfg *config.Config) (*gorm.DB, error) {
+	db, err := gorm.Open(
+		postgres.Open(
+			fmt.Sprintf(
+				"host=%s port=%d user=%s password=%s dbname=%s sslmode=%s",
+				cfg.Postgres.Hostname,
+				cfg.Postgres.Port,
+				cfg.Postgres.User,
+				cfg.Postgres.Password,
+				cfg.Postgres.Database,
+				cfg.Postgres.SSLMode,
+			),
+		),
+		&gorm.Config{})
+
+	return db, err
+}
+
+func InitMigrate(db *gorm.DB) error {
+	err := db.AutoMigrate(&models.User{}, &models.DKIMKey{})
+	if err != nil {
+		return fmt.Errorf("could not auto migrate database: %w", err)
+	}
+
+	err = db.Exec(createViewRawSQL).Error
+	if err != nil {
+		return fmt.Errorf("could not create the view: %w", err)
+	}
+
+	return nil
+}