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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| package middlewares | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "github.com/labstack/echo/v4" | ||
| "golang.org/x/net/context" | ||
| "gorm.io/gorm" | ||
| "net/http" | ||
| "strings" | ||
| ) | ||
|
|
||
| var DbContext = "db" | ||
| var TxContext = "tx" | ||
|
|
||
| type GraphQLRequest struct { | ||
| Query string `json:"query"` | ||
| } | ||
|
|
||
| func TransactionMiddleware() echo.MiddlewareFunc { | ||
| return func(next echo.HandlerFunc) echo.HandlerFunc { | ||
| return func(c echo.Context) error { | ||
| db, ok := c.Get(DbContext).(*gorm.DB) | ||
| if !ok { | ||
| return echo.NewHTTPError(http.StatusInternalServerError, "Database connection not found") | ||
| } | ||
|
|
||
| var gqlReq GraphQLRequest | ||
| if err := json.NewDecoder(c.Request().Body).Decode(&gqlReq); err != nil { | ||
| return echo.NewHTTPError(http.StatusBadRequest, "Invalid request payload") | ||
| } | ||
|
|
||
| // Check if the operation is a mutation | ||
| if strings.HasPrefix(strings.TrimSpace(gqlReq.Query), "mutation") { | ||
| tx := db.Begin() | ||
| if tx.Error != nil { | ||
| return echo.NewHTTPError(http.StatusInternalServerError, "Failed to start transaction") | ||
| } | ||
|
|
||
| defer func() { | ||
| if r := recover(); r != nil { | ||
| tx.Rollback() | ||
| panic(r) | ||
| } else if c.Response().Status >= http.StatusBadRequest { | ||
| if err := tx.Rollback().Error; err != nil { | ||
| c.Logger().Error("Failed to rollback transaction: ", err) | ||
| } | ||
| } else { | ||
| if err := tx.Commit().Error; err != nil { | ||
| c.Logger().Error("Failed to commit transaction: ", err) | ||
| } | ||
| } | ||
| }() | ||
|
|
||
| ctx := context.WithValue(c.Request().Context(), TxContext, tx) | ||
| c.SetRequest(c.Request().WithContext(ctx)) | ||
| } | ||
|
|
||
| return next(c) | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // GetDBFromContext retrieves the GORM DB transaction from the context | ||
| func GetDBFromContext(ctx context.Context) *gorm.DB { | ||
| tx, _ := ctx.Value(TxContext).(*gorm.DB) | ||
| if tx != nil { | ||
| return tx | ||
| } | ||
| // Fallback to the main DB connection if no transaction is found | ||
| return ctx.Value(DbContext).(*gorm.DB) | ||
| } |