mirror of
https://github.com/42wim/matterbridge.git
synced 2024-12-11 19:52:04 -08:00
91 lines
2.6 KiB
Go
91 lines
2.6 KiB
Go
//go:build !cgolottie
|
|
|
|
package helper
|
|
|
|
import (
|
|
"io/ioutil"
|
|
"os"
|
|
"os/exec"
|
|
|
|
"github.com/sirupsen/logrus"
|
|
)
|
|
|
|
// CanConvertTgsToX Checks whether the external command necessary for ConvertTgsToX works.
|
|
func CanConvertTgsToX() error {
|
|
// We depend on the fact that `lottie_convert.py --help` has exit status 0.
|
|
// Hyrum's Law predicted this, and Murphy's Law predicts that this will break eventually.
|
|
// However, there is no alternative like `lottie_convert.py --is-properly-installed`
|
|
cmd := exec.Command("lottie_convert.py", "--help")
|
|
return cmd.Run()
|
|
}
|
|
|
|
// ConvertTgsToWebP convert input data (which should be tgs format) to WebP format
|
|
// This relies on an external command, which is ugly, but works.
|
|
func ConvertTgsToX(data *[]byte, outputFormat string, logger *logrus.Entry) error {
|
|
// lottie can't handle input from a pipe, so write to a temporary file:
|
|
tmpInFile, err := ioutil.TempFile(os.TempDir(), "matterbridge-lottie-input-*.tgs")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
tmpInFileName := tmpInFile.Name()
|
|
defer func() {
|
|
if removeErr := os.Remove(tmpInFileName); removeErr != nil {
|
|
logger.Errorf("Could not delete temporary (input) file %s: %v", tmpInFileName, removeErr)
|
|
}
|
|
}()
|
|
// lottie can handle writing to a pipe, but there is no way to do that platform-independently.
|
|
// "/dev/stdout" won't work on Windows, and "-" upsets Cairo for some reason. So we need another file:
|
|
tmpOutFile, err := ioutil.TempFile(os.TempDir(), "matterbridge-lottie-output-*.data")
|
|
if err != nil {
|
|
return err
|
|
}
|
|
tmpOutFileName := tmpOutFile.Name()
|
|
defer func() {
|
|
if removeErr := os.Remove(tmpOutFileName); removeErr != nil {
|
|
logger.Errorf("Could not delete temporary (output) file %s: %v", tmpOutFileName, removeErr)
|
|
}
|
|
}()
|
|
|
|
if _, writeErr := tmpInFile.Write(*data); writeErr != nil {
|
|
return writeErr
|
|
}
|
|
// Must close before calling lottie to avoid data races:
|
|
if closeErr := tmpInFile.Close(); closeErr != nil {
|
|
return closeErr
|
|
}
|
|
|
|
// Call lottie to transform:
|
|
cmd := exec.Command("lottie_convert.py", "--input-format", "lottie", "--output-format", outputFormat, tmpInFileName, tmpOutFileName)
|
|
cmd.Stdout = nil
|
|
cmd.Stderr = nil
|
|
// NB: lottie writes progress into to stderr in all cases.
|
|
_, stderr := cmd.Output()
|
|
if stderr != nil {
|
|
// 'stderr' already contains some parts of Stderr, because it was set to 'nil'.
|
|
return stderr
|
|
}
|
|
dataContents, err := ioutil.ReadFile(tmpOutFileName)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
*data = dataContents
|
|
return nil
|
|
}
|
|
|
|
func SupportsFormat(format string) bool {
|
|
switch format {
|
|
case "png":
|
|
fallthrough
|
|
case "webp":
|
|
return true
|
|
default:
|
|
return false
|
|
}
|
|
return false
|
|
}
|
|
|
|
func LottieBackend() string {
|
|
return "lottie_convert.py"
|
|
}
|