rename backend to pkg

pkg/components/phantom_renderer.go

@@ -0,0 +1,67 @@
+package components
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"io"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"time"
+
+	log "github.com/alecthomas/log4go"
+)
+
+type PhantomRenderer struct {
+	ImagesDir  string
+	PhantomDir string
+}
+
+func (self *PhantomRenderer) RenderToPng(url string) (string, error) {
+	log.Info("PhantomRenderer::renderToPng url %v", url)
+	binPath, _ := filepath.Abs(filepath.Join(self.PhantomDir, "phantomjs"))
+	scriptPath, _ := filepath.Abs(filepath.Join(self.PhantomDir, "render.js"))
+	pngPath, _ := filepath.Abs(filepath.Join(self.ImagesDir, getHash(url)))
+	pngPath = pngPath + ".png"
+
+	cmd := exec.Command(binPath, scriptPath, "url="+url, "width=100", "height=100", "png="+pngPath)
+	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("failed to kill: %v", err)
+		}
+	case <-done:
+	}
+
+	return pngPath, nil
+}
+
+func getHash(text string) string {
+	hasher := md5.New()
+	hasher.Write([]byte(text))
+	return hex.EncodeToString(hasher.Sum(nil))
+}

pkg/components/phantom_renderer_test.go

@@ -0,0 +1,35 @@
+package components
+
+import (
+	"io/ioutil"
+	"os"
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestPhantomRender(t *testing.T) {
+
+	Convey("Can render url", t, func() {
+		tempDir, _ := ioutil.TempDir("", "img")
+		renderer := &PhantomRenderer{ImagesDir: tempDir, PhantomDir: "../../_vendor/phantomjs/"}
+		png, err := renderer.RenderToPng("http://www.google.com")
+		So(err, ShouldBeNil)
+		So(exists(png), ShouldEqual, true)
+
+		//_, err = os.Stat(store.getFilePathForDashboard("hello"))
+		//So(err, ShouldBeNil)
+	})
+
+}
+
+func exists(path string) bool {
+	_, err := os.Stat(path)
+	if err == nil {
+		return true
+	}
+	if os.IsNotExist(err) {
+		return false
+	}
+	return false
+}