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renderer.go
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/
renderer.go
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package renderer
import (
"errors"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"runtime"
"time"
"strconv"
"strings"
"github.com/grafana/grafana/pkg/log"
"github.com/grafana/grafana/pkg/middleware"
"github.com/grafana/grafana/pkg/setting"
"github.com/grafana/grafana/pkg/util"
)
type RenderOpts struct {
Path string
Width string
Height string
Timeout string
OrgId int64
Timezone string
}
var ErrTimeout = errors.New("Timeout error. You can set timeout in seconds with &timeout url parameter")
var rendererLog log.Logger = log.New("png-renderer")
func isoTimeOffsetToPosixTz(isoOffset string) string {
// invert offset
if strings.HasPrefix(isoOffset, "UTC+") {
return strings.Replace(isoOffset, "UTC+", "UTC-", 1)
}
if strings.HasPrefix(isoOffset, "UTC-") {
return strings.Replace(isoOffset, "UTC-", "UTC+", 1)
}
return isoOffset
}
func appendEnviron(baseEnviron []string, name string, value string) []string {
results := make([]string, 0)
prefix := fmt.Sprintf("%s=", name)
for _, v := range baseEnviron {
if !strings.HasPrefix(v, prefix) {
results = append(results, v)
}
}
return append(results, fmt.Sprintf("%s=%s", name, value))
}
func RenderToPng(params *RenderOpts) (string, error) {
rendererLog.Info("Rendering", "path", params.Path)
var executable = "phantomjs"
if runtime.GOOS == "windows" {
executable = executable + ".exe"
}
localDomain := "localhost"
if setting.HttpAddr != setting.DEFAULT_HTTP_ADDR {
localDomain = setting.HttpAddr
}
url := fmt.Sprintf("%s://%s:%s/%s", setting.Protocol, localDomain, setting.HttpPort, params.Path)
binPath, _ := filepath.Abs(filepath.Join(setting.PhantomDir, executable))
scriptPath, _ := filepath.Abs(filepath.Join(setting.PhantomDir, "render.js"))
pngPath, _ := filepath.Abs(filepath.Join(setting.ImagesDir, util.GetRandomString(20)))
pngPath = pngPath + ".png"
renderKey := middleware.AddRenderAuthKey(params.OrgId)
defer middleware.RemoveRenderAuthKey(renderKey)
timeout, err := strconv.Atoi(params.Timeout)
if err != nil {
timeout = 15
}
cmdArgs := []string{
"--ignore-ssl-errors=true",
"--web-security=false",
scriptPath,
"url=" + url,
"width=" + params.Width,
"height=" + params.Height,
"png=" + pngPath,
"domain=" + localDomain,
"timeout=" + strconv.Itoa(timeout),
"renderKey=" + renderKey,
}
cmd := exec.Command(binPath, cmdArgs...)
stdout, err := cmd.StdoutPipe()
if err != nil {
return "", err
}
stderr, err := cmd.StderrPipe()
if err != nil {
return "", err
}
if params.Timezone != "" {
baseEnviron := os.Environ()
cmd.Env = appendEnviron(baseEnviron, "TZ", isoTimeOffsetToPosixTz(params.Timezone))
}
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(time.Duration(timeout) * time.Second):
if err := cmd.Process.Kill(); err != nil {
rendererLog.Error("failed to kill", "error", err)
}
return "", ErrTimeout
case <-done:
}
rendererLog.Debug("Image rendered", "path", pngPath)
return pngPath, nil
}