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Make lottie_convert work on platforms without /dev/stdout (#1424)

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Fixes #1423.
This commit is contained in:
Ben Wiederhake 2021-03-20 22:42:41 +01:00 committed by GitHub
parent ee5d9b43b5
commit 0450482e6e
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1 changed files with 26 additions and 9 deletions
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35
bridge/helper/helper.go
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@ -248,35 +248,52 @@ func CanConvertTgsToX() error {
// 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:
tmpFile, err := ioutil.TempFile(os.TempDir(), "matterbridge-lottie-*.tgs")
tmpInFile, err := ioutil.TempFile(os.TempDir(), "matterbridge-lottie-input-*.tgs")
if err != nil {
return err
}
tmpFileName := tmpFile.Name()
tmpInFileName := tmpInFile.Name()
defer func() {
if removeErr := os.Remove(tmpFileName); removeErr != nil {
logger.Errorf("Could not delete temporary file %s: %v", tmpFileName, removeErr)
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 := tmpFile.Write(*data); writeErr != nil {
if _, writeErr := tmpInFile.Write(*data); writeErr != nil {
return writeErr
}
// Must close before calling lottie to avoid data races:
if closeErr := tmpFile.Close(); closeErr != nil {
if closeErr := tmpInFile.Close(); closeErr != nil {
return closeErr
}
// Call lottie to transform:
cmd := exec.Command("lottie_convert.py", "--input-format", "lottie", "--output-format", outputFormat, tmpFileName, "/dev/stdout")
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.
stdout, stderr := cmd.Output()
_, 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 = stdout
*data = dataContents
return nil
}