add new instance and provide multiple converting files close #2

converter/converter.go

@@ -2,40 +2,29 @@ package converter
 
 import (
 	"context"
+	"fmt"
 	"os"
 	"path/filepath"
 	"runtime"
+	"strings"
 	"time"
 
+	"gitea.tecamino.com/paadi/html2pdf/models"
 	"github.com/chromedp/cdproto/page"
 	"github.com/chromedp/chromedp"
 )
 
+// html to pdf converter structure for
 type Converter struct {
 	chromePath string
+	ctx        context.Context
+	cancel     context.CancelFunc
 }
 
+// NewConverter starts a new converter instance with a chrome headless shell executable
 func NewConverter(chromePath string) *Converter {
-	return &Converter{chromePath: chromePath}
-}
-
-func (c *Converter) Convert(imputFile, outputFile string) error {
-
-	chromePath := c.getChromePath()
-	htmlURL := "file://"
-
-	switch runtime.GOOS {
-	case "windows":
-		htmlURL += "/"
-	}
-
-	// Convert to absolute path
-	absPath, err := filepath.Abs(imputFile)
-	if err != nil {
-		return err
-	}
-
-	htmlURL += filepath.ToSlash(absPath)
+	c := &Converter{chromePath: chromePath}
+	chromePath = c.getChromePath()
 
 	opts := append(chromedp.DefaultExecAllocatorOptions[:],
 		chromedp.ExecPath(chromePath),
@@ -44,38 +33,65 @@ func (c *Converter) Convert(imputFile, outputFile string) error {
 		chromedp.DisableGPU,
 	)
 
-	allocCtx, cancel := chromedp.NewExecAllocator(context.Background(), opts...)
-	defer cancel()
-	ctx, cancel := chromedp.NewContext(allocCtx)
-	defer cancel()
+	var allocCtx context.Context
+	allocCtx, c.cancel = chromedp.NewExecAllocator(context.Background(), opts...)
+	c.ctx, c.cancel = chromedp.NewContext(allocCtx)
+	return c
+}
 
-	ctx, cancel = context.WithTimeout(ctx, 60*time.Second)
-	defer cancel()
+// Convert converts all given input files
+func (c *Converter) Convert(files ...models.File) error {
+	for _, f := range files {
+		if f.Input == "" || filepath.Ext(f.Input) != ".html" {
+			return fmt.Errorf("no .html input file path provided: %s", f.Input)
+		} else if f.Output == "" || filepath.Ext(f.Output) != ".pdf" {
+			return fmt.Errorf("no .pdf output file path provided: %s", f.Output)
+		}
 
-	var pdf []byte
-	err = chromedp.Run(ctx,
-		chromedp.Navigate(htmlURL),
-		chromedp.WaitReady("body", chromedp.ByQuery),
-		chromedp.ActionFunc(func(ctx context.Context) error {
-			buf, _, err := page.PrintToPDF().
-				WithPrintBackground(true).
-				WithPaperWidth(8.27).
-				WithPaperHeight(11.69).
-				Do(ctx)
-			if err != nil {
-				return err
-			}
-			pdf = buf
-			return nil
-		}),
-	)
-	if err != nil {
-		return err
-	}
+		var htmlURL strings.Builder
+		htmlURL.WriteString("file://")
 
-	// Save PDF to file
-	if err := os.WriteFile(outputFile, pdf, 0644); err != nil {
-		return err
+		switch runtime.GOOS {
+		case "windows":
+			htmlURL.WriteString("/")
+		}
+
+		// Convert to absolute path
+		absPath, err := filepath.Abs(f.Input)
+		if err != nil {
+			return err
+		}
+
+		htmlURL.WriteString(filepath.ToSlash(absPath))
+
+		c.ctx, c.cancel = context.WithTimeout(c.ctx, 60*time.Second)
+		defer c.cancel()
+
+		var pdfData []byte
+		err = chromedp.Run(c.ctx,
+			chromedp.Navigate(htmlURL.String()),
+			chromedp.WaitReady("body", chromedp.ByQuery),
+			chromedp.ActionFunc(func(ctx context.Context) error {
+				buf, _, err := page.PrintToPDF().
+					WithPrintBackground(true).
+					WithPaperWidth(8.27).
+					WithPaperHeight(11.69).
+					Do(ctx)
+				if err != nil {
+					return err
+				}
+				pdfData = buf
+				return nil
+			}),
+		)
+		if err != nil {
+			return err
+		}
+
+		// Save PDF to file
+		if err := os.WriteFile(f.Output, pdfData, 0644); err != nil {
+			return err
+		}
 	}
 	return nil
 }