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renderer.go
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/
renderer.go
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package renderer
import (
"io"
"os"
"os/exec"
"path/filepath"
"time"
"github.com/grafana/grafana/pkg/log"
"github.com/grafana/grafana/pkg/setting"
"github.com/grafana/grafana/pkg/util"
)
type RenderOpts struct {
Url string
Width string
Height string
SessionId string
}
func RenderToPng(params *RenderOpts) (string, error) {
log.Info("PhantomRenderer::renderToPng url %v", params.Url)
binPath, _ := filepath.Abs(filepath.Join(setting.PhantomDir, "phantomjs"))
scriptPath, _ := filepath.Abs(filepath.Join(setting.PhantomDir, "render.js"))
pngPath, _ := filepath.Abs(filepath.Join(setting.ImagesDir, util.GetRandomString(20)))
pngPath = pngPath + ".png"
cmd := exec.Command(binPath, "--ignore-ssl-errors=true", scriptPath, "url="+params.Url, "width="+params.Width,
"height="+params.Height, "png="+pngPath, "cookiename="+setting.SessionOptions.CookieName,
"domain="+setting.Domain, "sessionid="+params.SessionId)
stdout, err := cmd.StdoutPipe()
if err != nil {
return "", err
}
stderr, err := cmd.StderrPipe()
if err != nil {
return "", err
}
err = cmd.Start()
if err != nil {
return "", err
}
go io.Copy(os.Stdout, stdout)
go io.Copy(os.Stdout, stderr)
done := make(chan error)
go func() {
cmd.Wait()
close(done)
}()
select {
case <-time.After(10 * time.Second):
if err := cmd.Process.Kill(); err != nil {
log.Error(4, "failed to kill: %v", err)
}
case <-done:
}
return pngPath, nil
}