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package storageproviders
import (
"bufio"
"fmt"
"os"
"path/filepath"
"github.com/owncast/owncast/core/data"
"github.com/owncast/owncast/core/playlist"
"github.com/owncast/owncast/utils"
log "github.com/sirupsen/logrus"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3/s3manager"
"github.com/owncast/owncast/config"
"github.com/grafov/m3u8"
)
// If we try to upload a playlist but it is not yet on disk
// then keep a reference to it here.
var _queuedPlaylistUpdates = make(map[string]string)
// S3Storage is the s3 implementation of a storage provider.
type S3Storage struct {
sess *session.Session
host string
s3Endpoint string
s3ServingEndpoint string
s3Region string
s3Bucket string
s3AccessKey string
s3Secret string
s3ACL string
}
var _uploader *s3manager.Uploader
// Setup sets up the s3 storage for saving the video to s3.
func (s *S3Storage) Setup() error {
log.Trace("Setting up S3 for external storage of video...")
s3Config := data.GetS3Config()
if s3Config.ServingEndpoint != "" {
s.host = s3Config.ServingEndpoint
} else {
s.host = fmt.Sprintf("%s/%s", s3Config.Endpoint, s3Config.Bucket)
}
s.s3Endpoint = s3Config.Endpoint
s.s3ServingEndpoint = s3Config.ServingEndpoint
s.s3Region = s3Config.Region
s.s3Bucket = s3Config.Bucket
s.s3AccessKey = s3Config.AccessKey
s.s3Secret = s3Config.Secret
s.s3ACL = s3Config.ACL
s.sess = s.connectAWS()
_uploader = s3manager.NewUploader(s.sess)
return nil
}
// SegmentWritten is called when a single segment of video is written.
func (s *S3Storage) SegmentWritten(localFilePath string) {
index := utils.GetIndexFromFilePath(localFilePath)
performanceMonitorKey := "s3upload-" + index
utils.StartPerformanceMonitor(performanceMonitorKey)
// Upload the segment
if _, err := s.Save(localFilePath, 0); err != nil {
log.Errorln(err)
return
}
averagePerformance := utils.GetAveragePerformance(performanceMonitorKey)
// Warn the user about long-running save operations
if averagePerformance != 0 {
if averagePerformance > float64(data.GetStreamLatencyLevel().SecondsPerSegment)*0.9 {
log.Warnln("Possible slow uploads: average upload S3 save duration", averagePerformance, "s. troubleshoot this issue by visiting https://owncast.online/docs/troubleshooting/")
}
}
// Upload the variant playlist for this segment
// so the segments and the HLS playlist referencing
// them are in sync.
playlistPath := filepath.Join(filepath.Dir(localFilePath), "stream.m3u8")
if _, err := s.Save(playlistPath, 0); err != nil {
_queuedPlaylistUpdates[playlistPath] = playlistPath
if pErr, ok := err.(*os.PathError); ok {
log.Debugln(pErr.Path, "does not yet exist locally when trying to upload to S3 storage.")
return
}
}
}
// VariantPlaylistWritten is called when a variant hls playlist is written.
func (s *S3Storage) VariantPlaylistWritten(localFilePath string) {
// We are uploading the variant playlist after uploading the segment
// to make sure we're not referring to files in a playlist that don't
// yet exist. See SegmentWritten.
if _, ok := _queuedPlaylistUpdates[localFilePath]; ok {
if _, err := s.Save(localFilePath, 0); err != nil {
log.Errorln(err)
_queuedPlaylistUpdates[localFilePath] = localFilePath
}
delete(_queuedPlaylistUpdates, localFilePath)
}
}
// MasterPlaylistWritten is called when the master hls playlist is written.
func (s *S3Storage) MasterPlaylistWritten(localFilePath string) {
// Rewrite the playlist to use absolute remote S3 URLs
if err := s.rewriteRemotePlaylist(localFilePath); err != nil {
log.Warnln(err)
}
}
// Save saves the file to the s3 bucket.
func (s *S3Storage) Save(filePath string, retryCount int) (string, error) {
file, err := os.Open(filePath) // nolint
if err != nil {
return "", err
}
defer file.Close()
maxAgeSeconds := utils.GetCacheDurationSecondsForPath(filePath)
cacheControlHeader := fmt.Sprintf("max-age=%d", maxAgeSeconds)
uploadInput := &s3manager.UploadInput{
Bucket: aws.String(s.s3Bucket), // Bucket to be used
Key: aws.String(filePath), // Name of the file to be saved
Body: file, // File
CacheControl: &cacheControlHeader,
}
if s.s3ACL != "" {
uploadInput.ACL = aws.String(s.s3ACL)
} else {
// Default ACL
uploadInput.ACL = aws.String("public-read")
}
response, err := _uploader.Upload(uploadInput)
if err != nil {
log.Traceln("error uploading:", filePath, err.Error())
if retryCount < 4 {
log.Traceln("Retrying...")
return s.Save(filePath, retryCount+1)
}
log.Warnln("Giving up on", filePath, err)
return "", fmt.Errorf("Giving up on %s", filePath)
}
return response.Location, nil
}
func (s *S3Storage) connectAWS() *session.Session {
creds := credentials.NewStaticCredentials(s.s3AccessKey, s.s3Secret, "")
_, err := creds.Get()
if err != nil {
log.Panicln(err)
}
sess, err := session.NewSession(
&aws.Config{
Region: aws.String(s.s3Region),
Credentials: creds,
Endpoint: aws.String(s.s3Endpoint),
},
)
if err != nil {
log.Panicln(err)
}
return sess
}
// rewriteRemotePlaylist will take a local playlist and rewrite it to have absolute URLs to remote locations.
func (s *S3Storage) rewriteRemotePlaylist(filePath string) error {
f, err := os.Open(filePath) // nolint
if err != nil {
panic(err)
}
p := m3u8.NewMasterPlaylist()
if err := p.DecodeFrom(bufio.NewReader(f), false); err != nil {
log.Warnln(err)
}
for _, item := range p.Variants {
item.URI = s.host + filepath.Join("/hls", item.URI)
}
publicPath := filepath.Join(config.HLSStoragePath, filepath.Base(filePath))
newPlaylist := p.String()
return playlist.WritePlaylist(newPlaylist, publicPath)
}
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