问题现象

有个生成pdf的接口，到处pdf为空；docker环境必现，但是本地环境无法复现

1、代码增加各处错误判断，发现docker环境调用接口出现

Loading pages (1/6)
[>                                                           ] 0%
[======>                                                     ] 10%
[======================>                                     ] 37%
[========================>                                   ] 41%
[==============================>                             ] 50%
[====================================>                       ] 61%
[======================================================>     ] 90%
signal: killed

2、查看docker系统日志

dmesg|grep "kill"

发现oom

查看资料后显示wkhtmltopdf创建pdf会造成高内存分配

优化pdf参数，问题得到解决

// Configure PDF generator with memory-saving optionspdfg, err := wkhtmltopdf.NewPDFGenerator()if err != nil {return nil, fmt.Errorf("PDF generator initialization failed: %w", err)}pdfg.PageSize.Set(wkhtmltopdf.PageSizeA4)pdfg.Dpi.Set(96) // 1、设置dpi，降低内存使用pdfg.NoCollate.Set(true)  // Disable collation to reduce memorypdfg.Grayscale.Set(false)// Configure page with memory optimization settingspage := wkhtmltopdf.NewPageReader(r)page.LoadErrorHandling.Set("ignore")page.JavascriptDelay.Set(2000) // Allow time for JS to executepdfg.AddPage(page)// Set environment variables for memory constraintsos.Setenv("QTWEBKIT_SETTINGS", "MaximumPages=1") //2、限制同时处理的页数，避免内存峰值os.Setenv("QTWEBKIT_MAX_MEMORY", "256M") // Limit WebKit memory usage// Create PDF with timeout// 3、增加超时判断pdfCtx, pdfCancel := context.WithTimeout(context.Background(), 5*time.Minute)defer pdfCancel()errChan := make(chan error, 1)go func() {defer close(errChan)errChan <- pdfg.Create()}()select {case err := <-errChan:if err != nil {return nil, fmt.Errorf("PDF generation failed: %w", err)}case <-pdfCtx.Done():return nil, fmt.Errorf("PDF generation timed out")}// Return the generated PDFreturn pdfg.Bytes(), nil