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pdf.go
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pdf.go
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package pdf
import (
"context"
"sync"
"github.com/chromedp/cdproto/page"
"github.com/chromedp/chromedp"
)
type ServiceInterface interface {
HTMLToPdf(html string) []byte
}
type PDFService struct {
chromeWebSocketURL string
}
func NewPDFService(chromeWebSocketURL string) *PDFService {
return &PDFService{
chromeWebSocketURL: chromeWebSocketURL,
}
}
func (c *PDFService) HTMLToPdf(html string) []byte {
allocatorContext, cancel := chromedp.NewRemoteAllocator(context.Background(), c.chromeWebSocketURL)
defer cancel()
ctx, cancel := chromedp.NewContext(allocatorContext)
defer cancel()
// do this first so that its page.EventLoadEventFired event won't be caught
if err := chromedp.Run(ctx,
chromedp.Navigate("about:blank"),
); err != nil {
panic(err)
}
var buf []byte
var wg sync.WaitGroup
wg.Add(1)
// waiting to page load event
chromedp.ListenTarget(ctx, func(ev interface{}) {
switch ev.(type) {
case *page.EventLoadEventFired:
go func() {
if err := chromedp.Run(ctx, printToPDF(&buf)); err != nil {
panic(err)
}
wg.Done()
}()
}
})
if err := chromedp.Run(ctx,
chromedp.PollFunction(
"(html) => {document.open();document.write(html);document.close();return true;}",
nil,
chromedp.WithPollingArgs(html),
),
); err != nil {
panic(err)
}
wg.Wait()
page.Close()
return buf
}
func printToPDF(res *[]byte) chromedp.Tasks {
return chromedp.Tasks{
chromedp.ActionFunc(func(ctx context.Context) error {
buf, _, err := page.PrintToPDF().WithPrintBackground(false).Do(ctx)
if err != nil {
return err
}
*res = buf
return nil
}),
}
}