feat: add tracing logs after process is complete (#8680)

- Add the written HTTP status after completing the HTTP response. This makes it easier to find that one request that returns a different status code (ref. https://codeberg.org/Codeberg/Community/issues/2049#issue-1972600)
- Add the affected amount of rows and last insert ID after the SQL query is done, I have not yet a concrete use-case but this might help with debugging which ID corresponds to some SQL query that someone might want to take a closer look at and if some SQL query affects more than necessary amount of rows.

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/8680
Reviewed-by: Earl Warren <earl-warren@noreply.codeberg.org>
Co-authored-by: Gusted <postmaster@gusted.xyz>
Co-committed-by: Gusted <postmaster@gusted.xyz>

models/db/engine.go

@@ -386,6 +386,15 @@ func (TracingHook) BeforeProcess(c *contexts.ContextHook) (context.Context, erro
 }
 
 func (TracingHook) AfterProcess(c *contexts.ContextHook) error {
+	if c.Result != nil {
+		if rowsAffected, err := c.Result.RowsAffected(); err == nil {
+			trace.Logf(c.Ctx, "rows affected", "%d", rowsAffected)
+		}
+		if lastID, err := c.Result.LastInsertId(); err == nil {
+			trace.Logf(c.Ctx, "last insert id", "%d", lastID)
+		}
+	}
+
 	c.Ctx.Value(sqlTask{}).(*trace.Task).End()
 	return nil
 }

routers/common/middleware.go

@@ -46,7 +46,11 @@ func ProtocolMiddlewares() (handlers []any) {
 			defer finished()
 			trace.Log(ctx, "method", req.Method)
 			trace.Log(ctx, "url", req.RequestURI)
-			next.ServeHTTP(context.WrapResponseWriter(resp), req.WithContext(cache.WithCacheContext(ctx)))
+
+			respWriter := context.WrapResponseWriter(resp)
+			next.ServeHTTP(respWriter, req.WithContext(cache.WithCacheContext(ctx)))
+
+			trace.Logf(ctx, "status", "%d", respWriter.WrittenStatus())
 		})
 	})