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broadcast.go
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package server
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"math"
"math/big"
"math/rand"
"net/url"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
ethcommon "github.com/ethereum/go-ethereum/common"
"github.com/livepeer/go-livepeer/clog"
"github.com/livepeer/go-livepeer/common"
"github.com/livepeer/go-livepeer/core"
"github.com/livepeer/go-livepeer/drivers"
"github.com/livepeer/go-livepeer/monitor"
"github.com/livepeer/go-livepeer/net"
"github.com/livepeer/go-livepeer/pm"
"github.com/livepeer/go-livepeer/verification"
"github.com/livepeer/livepeer-data/pkg/data"
"github.com/livepeer/livepeer-data/pkg/event"
"github.com/livepeer/lpms/ffmpeg"
"github.com/livepeer/lpms/stream"
)
var refreshTimeout = 2500 * time.Millisecond
var maxDurationSec = common.MaxDuration.Seconds()
// Max threshold for # of broadcast sessions under which we will refresh the session list
var maxRefreshSessionsThreshold = 8.0
var Policy *verification.Policy
var BroadcastCfg = &BroadcastConfig{}
var MaxAttempts = 3
var MetadataQueue event.Producer
var MetadataPublishTimeout = 1 * time.Second
var getOrchestratorInfoRPC = GetOrchestratorInfo
var downloadSeg = drivers.GetSegmentData
type BroadcastConfig struct {
maxPrice *big.Rat
mu sync.RWMutex
}
type SegFlightMetadata struct {
startTime time.Time
segDur time.Duration
}
func (cfg *BroadcastConfig) MaxPrice() *big.Rat {
cfg.mu.RLock()
defer cfg.mu.RUnlock()
return cfg.maxPrice
}
func (cfg *BroadcastConfig) SetMaxPrice(price *big.Rat) {
cfg.mu.Lock()
defer cfg.mu.Unlock()
cfg.maxPrice = price
if monitor.Enabled {
monitor.MaxTranscodingPrice(price)
}
}
type sessionsCreator func() ([]*BroadcastSession, error)
type SessionPool struct {
mid core.ManifestID
// Accessing or changing any of the below requires ownership of this mutex
lock sync.Mutex
sel BroadcastSessionsSelector
lastSess []*BroadcastSession
sessMap map[string]*BroadcastSession
numOrchs int // how many orchs to request at once
poolSize int
refreshing bool // only allow one refresh in-flight
finished bool // set at stream end
createSessions sessionsCreator
sus *suspender
}
func NewSessionPool(mid core.ManifestID, poolSize, numOrchs int, sus *suspender, createSession sessionsCreator,
sel BroadcastSessionsSelector) *SessionPool {
return &SessionPool{
mid: mid,
numOrchs: numOrchs,
poolSize: poolSize,
sessMap: make(map[string]*BroadcastSession),
sel: sel,
createSessions: createSession,
sus: sus,
}
}
func (sp *SessionPool) suspend(orch string) {
poolSize := math.Max(1, float64(sp.poolSize))
numOrchs := math.Max(1, float64(sp.numOrchs))
penalty := int(math.Ceil(poolSize / numOrchs))
sp.sus.suspend(orch, penalty)
}
func (sp *SessionPool) refreshSessions(ctx context.Context) {
started := time.Now()
clog.V(common.DEBUG).Infof(ctx, "Starting session refresh")
defer func() {
sp.lock.Lock()
clog.V(common.DEBUG).Infof(ctx, "Ending session refresh dur=%s orchs=%d", time.Since(started),
sp.sel.Size())
sp.lock.Unlock()
}()
sp.lock.Lock()
if sp.finished || sp.refreshing {
sp.lock.Unlock()
return
}
sp.refreshing = true
sp.lock.Unlock()
sp.sus.signalRefresh()
newBroadcastSessions, err := sp.createSessions()
if err != nil {
sp.lock.Lock()
sp.refreshing = false
sp.lock.Unlock()
return
}
// if newBroadcastSessions is empty, exit without refreshing list
if len(newBroadcastSessions) <= 0 {
sp.lock.Lock()
sp.refreshing = false
sp.lock.Unlock()
return
}
uniqueSessions := make([]*BroadcastSession, 0, len(newBroadcastSessions))
sp.lock.Lock()
defer sp.lock.Unlock()
sp.refreshing = false
if sp.finished {
return
}
for _, sess := range newBroadcastSessions {
if _, ok := sp.sessMap[sess.OrchestratorInfo.Transcoder]; ok {
continue
}
uniqueSessions = append(uniqueSessions, sess)
sp.sessMap[sess.OrchestratorInfo.Transcoder] = sess
}
sp.sel.Add(uniqueSessions)
}
func includesSession(sessions []*BroadcastSession, session *BroadcastSession) bool {
for _, sess := range sessions {
if sess == session {
return true
}
}
return false
}
func getOrchs(sessions []*BroadcastSession) []string {
res := make([]string, len(sessions))
for i, sess := range sessions {
res[i] = sess.Transcoder()
}
return res
}
func removeSessionFromList(sessions []*BroadcastSession, sess *BroadcastSession) []*BroadcastSession {
var res []*BroadcastSession
for _, ls := range sessions {
if ls != sess {
res = append(res, ls)
}
}
return res
}
func selectSession(sessions []*BroadcastSession, exclude []*BroadcastSession, durMult int) *BroadcastSession {
for _, session := range sessions {
if len(session.SegsInFlight) > 0 &&
time.Since(session.SegsInFlight[0].startTime) < time.Duration(durMult)*session.SegsInFlight[0].segDur &&
!includesSession(exclude, session) {
// Re-use last session if oldest segment is in-flight for < durMult * segDur
return session
}
}
return nil
}
func (sp *SessionPool) selectSessions(ctx context.Context, sessionsNum int) []*BroadcastSession {
sp.lock.Lock()
defer sp.lock.Unlock()
if sp.poolSize == 0 {
return nil
}
checkSessions := func(m *SessionPool) bool {
numSess := m.sel.Size()
if numSess < int(math.Min(maxRefreshSessionsThreshold, math.Ceil(float64(m.numOrchs)/2.0))) {
go m.refreshSessions(ctx)
}
return (numSess > 0 || len(sp.lastSess) > 0)
}
var selectedSessions []*BroadcastSession
for checkSessions(sp) {
var sess *BroadcastSession
// Re-use last session if oldest segment is in-flight for < segDur
gotFromLast := false
sess = selectSession(sp.lastSess, selectedSessions, 1)
if sess == nil {
// Or try a new session from the available ones
sess = sp.sel.Select(ctx)
} else {
gotFromLast = true
}
if sess == nil {
// If no new sessions are available, re-use last session when oldest segment is in-flight for < 2 * segDur
sess = selectSession(sp.lastSess, selectedSessions, 2)
if sess != nil {
gotFromLast = true
clog.V(common.DEBUG).Infof(ctx, "No sessions in the selector for manifestID=%v re-using orch=%v with acceptable in-flight time",
sp.mid, sess.Transcoder())
}
}
// No session found, return nil
if sess == nil {
break
}
/*
Don't select sessions no longer in the map.
Retry if the first selected session has been removed from the map.
This may occur if the session is removed while still in the list.
To avoid a runtime search of the session list under lock, simply
fixup the session list at selection time by retrying the selection.
*/
if _, ok := sp.sessMap[sess.Transcoder()]; ok {
selectedSessions = append(selectedSessions, sess)
if len(selectedSessions) == sessionsNum {
break
}
} else {
if gotFromLast {
// Last session got removed from map (possibly due to a failure) so stop tracking its in-flight segments
sess.SegsInFlight = nil
sp.lastSess = removeSessionFromList(sp.lastSess, sess)
clog.V(common.DEBUG).Infof(ctx, "Removing orch=%v from manifestID=%s session list", sess.Transcoder(), sp.mid)
if monitor.Enabled {
monitor.OrchestratorSwapped(ctx)
}
}
}
}
if len(selectedSessions) == 0 {
// No session found, return nil
sp.lastSess = nil
} else {
for _, ls := range sp.lastSess {
if !includesSession(selectedSessions, ls) {
clog.V(common.DEBUG).Infof(ctx, "Swapping from orch=%v to orch=%+v for manifestID=%s", ls.Transcoder(),
getOrchs(selectedSessions), sp.mid)
if monitor.Enabled {
monitor.OrchestratorSwapped(ctx)
}
}
}
sp.lastSess = append([]*BroadcastSession{}, selectedSessions...)
}
return selectedSessions
}
func (sp *SessionPool) removeSession(session *BroadcastSession) {
sp.lock.Lock()
defer sp.lock.Unlock()
delete(sp.sessMap, session.Transcoder())
}
func (sp *SessionPool) cleanup() {
sp.lock.Lock()
defer sp.lock.Unlock()
sp.finished = true
sp.lastSess = nil
sp.sel.Clear()
sp.sessMap = make(map[string]*BroadcastSession) // prevent segfaults
}
func (sp *SessionPool) completeSession(sess *BroadcastSession) {
sp.lock.Lock()
defer sp.lock.Unlock()
if existingSess, ok := sp.sessMap[sess.Transcoder()]; ok {
if existingSess != sess {
// that means that sess object was removed from pool and then same
// Orchestrator was added to the pool again
return
}
sess.lock.Lock()
defer sess.lock.Unlock()
if len(sess.SegsInFlight) == 1 {
sess.SegsInFlight = nil
} else if len(sess.SegsInFlight) > 1 {
sess.SegsInFlight = sess.SegsInFlight[1:]
// skip returning this session back to the selector
// we will return it later in transcodeSegment() once all in-flight segs downloaded
return
}
sp.sel.Complete(sess)
}
}
type BroadcastSessionsManager struct {
mid core.ManifestID
VerificationFreq uint
// Accessing or changing any of the below requires ownership of this mutex
sessLock sync.Mutex
finished bool // set at stream end
trustedPool *SessionPool
untrustedPool *SessionPool
verifiedSession *BroadcastSession
}
func NewSessionManager(ctx context.Context, node *core.LivepeerNode, params *core.StreamParameters, sel BroadcastSessionsSelectorFactory) *BroadcastSessionsManager {
var trustedPoolSize, untrustedPoolSize float64
if node.OrchestratorPool != nil {
trustedPoolSize = float64(node.OrchestratorPool.SizeWith(common.ScoreAtLeast(common.Score_Trusted)))
untrustedPoolSize = float64(node.OrchestratorPool.SizeWith(common.ScoreEqualTo(common.Score_Untrusted)))
}
maxInflight := common.HTTPTimeout.Seconds() / SegLen.Seconds()
trustedNumOrchs := int(math.Min(trustedPoolSize, maxInflight*2))
untrustedNumOrchs := int(untrustedPoolSize)
susTrusted := newSuspender()
susUntrusted := newSuspender()
createSessionsTrusted := func() ([]*BroadcastSession, error) {
return selectOrchestrator(ctx, node, params, trustedNumOrchs, susTrusted, common.ScoreAtLeast(common.Score_Trusted))
}
createSessionsUntrusted := func() ([]*BroadcastSession, error) {
return selectOrchestrator(ctx, node, params, untrustedNumOrchs, susUntrusted, common.ScoreEqualTo(common.Score_Untrusted))
}
var stakeRdr stakeReader
if node.Eth != nil {
stakeRdr = &storeStakeReader{store: node.Database}
}
bsm := &BroadcastSessionsManager{
mid: params.ManifestID,
VerificationFreq: params.VerificationFreq,
trustedPool: NewSessionPool(params.ManifestID, int(trustedPoolSize), trustedNumOrchs, susTrusted, createSessionsTrusted, NewMinLSSelector(stakeRdr, 1.0)),
untrustedPool: NewSessionPool(params.ManifestID, int(untrustedPoolSize), untrustedNumOrchs, susUntrusted, createSessionsUntrusted, NewMinLSSelectorWithRandFreq(stakeRdr, 1.0, SelectRandFreq)),
}
bsm.trustedPool.refreshSessions(ctx)
bsm.untrustedPool.refreshSessions(ctx)
return bsm
}
func (bsm *BroadcastSessionsManager) suspendAndRemoveOrch(sess *BroadcastSession) {
if sess.OrchestratorScore == common.Score_Untrusted {
bsm.untrustedPool.suspend(sess.OrchestratorInfo.GetTranscoder())
bsm.untrustedPool.removeSession(sess)
} else {
bsm.trustedPool.suspend(sess.OrchestratorInfo.GetTranscoder())
bsm.trustedPool.removeSession(sess)
}
}
func (bsm *BroadcastSessionsManager) removeSession(session *BroadcastSession) {
bsm.sessLock.Lock()
defer bsm.sessLock.Unlock()
if session.OrchestratorScore == common.Score_Untrusted {
bsm.untrustedPool.removeSession(session)
} else {
bsm.trustedPool.removeSession(session)
}
}
func (bs *BroadcastSession) pushSegInFlight(seg *stream.HLSSegment) {
bs.lock.Lock()
bs.SegsInFlight = append(bs.SegsInFlight,
SegFlightMetadata{
startTime: time.Now(),
segDur: time.Duration(seg.Duration * float64(time.Second)),
})
bs.lock.Unlock()
}
// selects number of sessions to use according to current algorithm
func (bsm *BroadcastSessionsManager) selectSessions(ctx context.Context) ([]*BroadcastSession, bool, bool) {
bsm.sessLock.Lock()
defer bsm.sessLock.Unlock()
var verified bool
if bsm.VerificationFreq > 0 {
// Select 1 trusted O and 2 untrusted Os
sessions := bsm.trustedPool.selectSessions(ctx, 1)
untrustedSessions := bsm.untrustedPool.selectSessions(ctx, 2)
sessions = append(sessions, untrustedSessions...)
// Only return the last verified session if:
// - It is present in the 3 sessions returned by the selector
// - With probability 1 - 1/VerificationFrequency
if bsm.verifiedSession != nil && includesSession(sessions, bsm.verifiedSession) &&
common.RandomUintUnder(bsm.VerificationFreq) > 0 {
clog.V(common.DEBUG).Infof(ctx, "Reusing verified orch=%v", bsm.verifiedSession.OrchestratorInfo.Transcoder)
verified = true
// Mark remaining unused sessions returned by selector as complete
remaining := removeSessionFromList(sessions, bsm.verifiedSession)
for _, sess := range remaining {
bsm.completeSessionUnsafe(sess)
}
sessions = []*BroadcastSession{bsm.verifiedSession}
} else if bsm.verifiedSession != nil && !includesSession(sessions, bsm.verifiedSession) {
bsm.verifiedSession = nil
}
// Return selected sessions
return sessions, true, verified
}
// Default to selecting from untrusted pool
sessions := bsm.untrustedPool.selectSessions(ctx, 1)
if len(sessions) == 0 {
sessions = bsm.trustedPool.selectSessions(ctx, 1)
}
return sessions, false, verified
}
func (bsm *BroadcastSessionsManager) cleanup() {
bsm.sessLock.Lock()
defer bsm.sessLock.Unlock()
bsm.finished = true
bsm.trustedPool.cleanup()
bsm.untrustedPool.cleanup()
}
func (bsm *BroadcastSessionsManager) chooseResults(ctx context.Context, submitResultsCh chan *SubmitResult,
submittedCount int) (*BroadcastSession, *ReceivedTranscodeResult, error) {
trustedResult, untrustedResults, err := bsm.collectResults(submitResultsCh, submittedCount)
if trustedResult == nil {
// no results from trusted orch, using anything
if len(untrustedResults) == 0 {
// no results at all
return nil, nil, fmt.Errorf("error transcoding: no results at all err=%w", err)
}
return untrustedResults[0].Session, untrustedResults[0].TranscodeResult, untrustedResults[0].Err
}
if len(untrustedResults) == 0 {
// no results from untrusted orch, just using trusted ones
return trustedResult.Session, trustedResult.TranscodeResult, trustedResult.Err
}
segmToCheckIndex := rand.Intn(len(trustedResult.TranscodeResult.Segments))
// download trusted hashes
trustedHash, err := drivers.GetSegmentData(ctx, trustedResult.TranscodeResult.Segments[segmToCheckIndex].PerceptualHashUrl)
if err != nil {
err = fmt.Errorf("error downloading perceptual hash from url=%s err=%w",
trustedResult.TranscodeResult.Segments[segmToCheckIndex].PerceptualHashUrl, err)
return nil, nil, err
}
// verify untrusted hashes
var sessionsToSuspend []*BroadcastSession
for _, untrustedResult := range untrustedResults {
untrustedHash, err := drivers.GetSegmentData(ctx, untrustedResult.TranscodeResult.Segments[segmToCheckIndex].PerceptualHashUrl)
if err != nil {
err = fmt.Errorf("error downloading perceptual hash from url=%s err=%w",
untrustedResult.TranscodeResult.Segments[segmToCheckIndex].PerceptualHashUrl, err)
return nil, nil, err
}
equal, err := ffmpeg.CompareSignatureByBuffer(trustedHash, untrustedHash)
if monitor.Enabled {
monitor.FastVerificationDone(ctx)
}
if err != nil {
clog.Errorf(ctx, "error comparing perceptual hashes from url=%s err=%q",
untrustedResult.TranscodeResult.Segments[segmToCheckIndex].PerceptualHashUrl, err)
}
clog.Infof(ctx, "Hashes from url=%s and url=%s are equal=%v",
trustedResult.TranscodeResult.Segments[segmToCheckIndex].PerceptualHashUrl,
untrustedResult.TranscodeResult.Segments[segmToCheckIndex].PerceptualHashUrl, equal)
if equal {
// stick to this verified orchestrator for further segments.
if untrustedResult.Err == nil {
bsm.sessionVerified(untrustedResult.Session)
}
// suspend sessions which returned incorrect results
for _, s := range sessionsToSuspend {
bsm.suspendAndRemoveOrch(s)
}
return untrustedResult.Session, untrustedResult.TranscodeResult, untrustedResult.Err
} else {
sessionsToSuspend = append(sessionsToSuspend, untrustedResult.Session)
if monitor.Enabled {
monitor.FastVerificationFailed(ctx)
}
}
}
return trustedResult.Session, trustedResult.TranscodeResult, trustedResult.Err
}
func (bsm *BroadcastSessionsManager) collectResults(submitResultsCh chan *SubmitResult, submittedCount int) (*SubmitResult, []*SubmitResult, error) {
submitResults := make([]*SubmitResult, submittedCount)
// can have different strategies - for example, just use first one
// and ignore everything else
// for now wait for all the results
for i := 0; i < submittedCount; i++ {
submitResults[i] = <-submitResultsCh
}
// we're here because we're doing verification
var trustedResults *SubmitResult
var untrustedResults []*SubmitResult
var err error
for _, res := range submitResults {
if res.Err == nil && res.TranscodeResult != nil {
if res.Session.OrchestratorScore == common.Score_Trusted {
trustedResults = res
} else if res.Session == bsm.verifiedSession {
// verified result should always come first and therefore take the priority
untrustedResults = append([]*SubmitResult{res}, untrustedResults...)
} else {
untrustedResults = append(untrustedResults, res)
}
}
if res.Err != nil {
err = res.Err
if isNonRetryableError(err) {
bsm.completeSession(res.Session)
} else {
bsm.suspendAndRemoveOrch(res.Session)
}
}
}
return trustedResults, untrustedResults, err
}
// the caller needs to ensure bsm.sessLock is acquired before calling this.
func (bsm *BroadcastSessionsManager) completeSessionUnsafe(sess *BroadcastSession) {
if sess.OrchestratorScore == common.Score_Untrusted {
bsm.untrustedPool.completeSession(sess)
} else if sess.OrchestratorScore == common.Score_Trusted {
bsm.trustedPool.completeSession(sess)
} else {
panic("shouldn't happen")
}
}
func (bsm *BroadcastSessionsManager) completeSession(sess *BroadcastSession) {
bsm.sessLock.Lock()
defer bsm.sessLock.Unlock()
bsm.completeSessionUnsafe(sess)
}
func (bsm *BroadcastSessionsManager) sessionVerified(sess *BroadcastSession) {
bsm.sessLock.Lock()
defer bsm.sessLock.Unlock()
bsm.verifiedSession = sess
}
func (bsm *BroadcastSessionsManager) usingVerified() bool {
bsm.sessLock.Lock()
defer bsm.sessLock.Unlock()
return bsm.verifiedSession != nil
}
func selectOrchestrator(ctx context.Context, n *core.LivepeerNode, params *core.StreamParameters, count int, sus *suspender,
scorePred common.ScorePred) ([]*BroadcastSession, error) {
if n.OrchestratorPool == nil {
clog.Infof(ctx, "No orchestrators specified; not transcoding")
return nil, errDiscovery
}
tinfos, err := n.OrchestratorPool.GetOrchestrators(ctx, count, sus, params.Capabilities, scorePred)
if len(tinfos) <= 0 {
clog.InfofErr(ctx, "No orchestrators found; not transcoding", err)
return nil, errNoOrchs
}
if err != nil {
return nil, err
}
var sessions []*BroadcastSession
for _, tinfo := range tinfos {
var (
sessionID string
balance Balance
ticketParams *pm.TicketParams
)
if tinfo.AuthToken == nil {
clog.Errorf(ctx, "Missing auth token orch=%v", tinfo.Transcoder)
continue
}
if n.Sender != nil {
if tinfo.TicketParams == nil {
clog.Errorf(ctx, "Missing ticket params orch=%v", tinfo.Transcoder)
continue
}
ticketParams = pmTicketParams(tinfo.TicketParams)
sessionID = n.Sender.StartSession(*ticketParams)
if n.Balances != nil {
balance = core.NewBalance(ticketParams.Recipient, core.ManifestID(tinfo.AuthToken.SessionId), n.Balances)
}
}
var orchOS drivers.OSSession
if len(tinfo.Storage) > 0 {
orchOS = drivers.NewSession(tinfo.Storage[0])
}
bcastOS := params.OS
if bcastOS.IsExternal() {
// Give each O its own OS session to prevent front running uploads
pfx := fmt.Sprintf("%v/%v", params.ManifestID, tinfo.AuthToken.SessionId)
bcastOS = bcastOS.OS().NewSession(pfx)
}
session := &BroadcastSession{
Broadcaster: core.NewBroadcaster(n),
Params: params,
OrchestratorInfo: tinfo,
OrchestratorOS: orchOS,
BroadcasterOS: bcastOS,
Sender: n.Sender,
PMSessionID: sessionID,
Balances: n.Balances,
Balance: balance,
lock: &sync.RWMutex{},
OrchestratorScore: n.OrchestratorPool.GetInfo(tinfo.Transcoder).Score, // todo: use score from OrchestratorLocalInfo
}
sessions = append(sessions, session)
}
return sessions, nil
}
func processSegment(ctx context.Context, cxn *rtmpConnection, seg *stream.HLSSegment) ([]string, error) {
rtmpStrm := cxn.stream
nonce := cxn.nonce
cpl := cxn.pl
mid := cxn.mid
vProfile := cxn.profile
if seg.Duration > maxDurationSec || seg.Duration < 0 {
clog.Errorf(ctx, "Invalid duration seqNo=%d dur=%v", seg.SeqNo, seg.Duration)
return nil, fmt.Errorf("invalid duration %v", seg.Duration)
}
clog.V(common.DEBUG).Infof(ctx, "Processing segment dur=%v bytes=%v", seg.Duration, len(seg.Data))
if monitor.Enabled {
monitor.SegmentEmerged(ctx, nonce, seg.SeqNo, len(BroadcastJobVideoProfiles), seg.Duration)
}
atomic.AddUint64(&cxn.sourceBytes, uint64(len(seg.Data)))
seg.Name = "" // hijack seg.Name to convey the uploaded URI
ext, err := common.ProfileFormatExtension(vProfile.Format)
if err != nil {
clog.Errorf(ctx, "Unknown format extension err=%s", err)
return nil, err
}
name := fmt.Sprintf("%s/%d%s", vProfile.Name, seg.SeqNo, ext)
ros := cpl.GetRecordOSSession()
segDurMs := getSegDurMsString(seg)
hasZeroVideoFrame := seg.IsZeroFrame
if ros != nil && !hasZeroVideoFrame {
go func() {
now := time.Now()
uri, err := drivers.SaveRetried(ctx, ros, name, seg.Data, map[string]string{"duration": segDurMs}, 2)
took := time.Since(now)
if err != nil {
clog.Errorf(ctx, "Error saving name=%s bytes=%d to record store err=%q",
name, len(seg.Data), err)
} else {
cpl.InsertHLSSegmentJSON(vProfile, seg.SeqNo, uri, seg.Duration)
clog.Infof(ctx, "Successfully saved name=%s bytes=%d to record store took=%s",
name, len(seg.Data), took)
cpl.FlushRecord()
}
if monitor.Enabled {
monitor.RecordingSegmentSaved(took, err)
}
}()
}
uri, err := cpl.GetOSSession().SaveData(ctx, name, seg.Data, nil, 0)
if err != nil {
clog.Errorf(ctx, "Error saving segment err=%q", err)
if monitor.Enabled {
monitor.SegmentUploadFailed(ctx, nonce, seg.SeqNo, monitor.SegmentUploadErrorUnknown, err, true, "")
}
return nil, err
}
if cpl.GetOSSession().IsExternal() {
seg.Name = uri // hijack seg.Name to convey the uploaded URI
}
err = cpl.InsertHLSSegment(vProfile, seg.SeqNo, uri, seg.Duration)
if monitor.Enabled {
monitor.SourceSegmentAppeared(ctx, nonce, seg.SeqNo, string(mid), vProfile.Name, ros != nil)
}
if err != nil {
clog.Errorf(ctx, "Error inserting segment err=%q", err)
if monitor.Enabled {
monitor.SegmentUploadFailed(ctx, nonce, seg.SeqNo, monitor.SegmentUploadErrorDuplicateSegment, err, false, "")
}
}
if hasZeroVideoFrame {
var urls []string
for _, profile := range cxn.params.Profiles {
ext, err := common.ProfileFormatExtension(profile.Format)
if err != nil {
clog.Errorf(ctx, "Error getting extension for profile=%v with segment err=%q",
profile.Format, err)
return nil, err
}
name := fmt.Sprintf("%s/%d%s", profile.Name, seg.SeqNo, ext)
uri, err := cpl.GetOSSession().SaveData(ctx, name, seg.Data, nil, 0)
if err != nil {
clog.Errorf(ctx, "Error saving segment err=%q", err)
if monitor.Enabled {
monitor.SegmentUploadFailed(ctx, nonce, seg.SeqNo, monitor.SegmentUploadErrorUnknown, err, true, "")
}
return nil, err
}
urls = append(urls, uri)
err = cpl.InsertHLSSegment(&profile, seg.SeqNo, uri, seg.Duration)
if err != nil {
clog.Errorf(ctx, "Error inserting segment err=%q", err)
if monitor.Enabled {
monitor.SegmentUploadFailed(ctx, nonce, seg.SeqNo, monitor.SegmentUploadErrorDuplicateSegment, err, false, "")
}
}
}
return urls, nil
}
var sv *verification.SegmentVerifier
if Policy != nil {
sv = verification.NewSegmentVerifier(Policy)
}
var (
startTime = time.Now()
attempts []data.TranscodeAttemptInfo
urls []string
)
for len(attempts) < MaxAttempts {
// if transcodeSegment fails, retry; rudimentary
var info *data.TranscodeAttemptInfo
urls, info, err = transcodeSegment(ctx, cxn, seg, name, sv)
attempts = append(attempts, *info)
if err == nil {
break
}
if shouldStopStream(err) {
clog.Warningf(ctx, "Stopping current stream due to err=%q", err)
rtmpStrm.Close()
break
}
if isNonRetryableError(err) {
clog.Warningf(ctx, "Not retrying current segment due to non-retryable error err=%q", err)
break
}
if ctxErr := ctx.Err(); ctxErr != nil {
err = ctxErr
clog.Warningf(ctx, "Not retrying current segment due to context cancellation err=%q", err)
break
}
// recoverable error, retry
}
if MetadataQueue != nil {
success := err == nil && len(urls) > 0
streamID := string(mid)
if cxn.params != nil && cxn.params.ExternalStreamID != "" {
streamID = cxn.params.ExternalStreamID
}
key := newTranscodeEventKey(mid, streamID)
evt := newTranscodeEvent(streamID, seg, startTime, success, attempts)
go func() {
ctx, cancel := context.WithTimeout(context.Background(), MetadataPublishTimeout)
defer cancel()
if err := MetadataQueue.Publish(ctx, key, evt, false); err != nil {
clog.Errorf(ctx, "Error publishing stream transcode event: err=%q key=%q event=%+v", err, key, evt)
}
}()
}
if len(attempts) == MaxAttempts && err != nil {
err = fmt.Errorf("Hit max transcode attempts: %w", err)
}
return urls, err
}
func transcodeSegment(ctx context.Context, cxn *rtmpConnection, seg *stream.HLSSegment, name string,
verifier *verification.SegmentVerifier) ([]string, *data.TranscodeAttemptInfo, error) {
var urls []string
info := &data.TranscodeAttemptInfo{}
var err error
defer func(startTime time.Time) {
info.LatencyMs = time.Since(startTime).Milliseconds()
if err != nil {
errStr := err.Error()
info.Error = &errStr
}
}(time.Now())
nonce := cxn.nonce
sessions, calcPerceptualHash, verified := cxn.sessManager.selectSessions(ctx)
// Return early under a few circumstances:
// View-only (non-transcoded) streams or no sessions available
if len(sessions) == 0 {
if monitor.Enabled {
monitor.SegmentTranscodeFailed(ctx, monitor.SegmentTranscodeErrorNoOrchestrators, nonce, seg.SeqNo, errNoOrchs, true)
}
clog.Infof(ctx, "No sessions available for segment")
// We may want to introduce a "non-retryable" error type here
// would help error propagation for live ingest.
// similar to the orchestrator's RemoteTranscoderFatalError
return nil, info, nil
}
info.Orchestrator = data.OrchestratorMetadata{
TranscoderUri: sessions[0].Transcoder(),
Address: sessions[0].Address(),
}
clog.Infof(ctx, "Trying to transcode segment using sessions=%d", len(sessions))
if monitor.Enabled {
monitor.TranscodeTry(ctx, nonce, seg.SeqNo)
}
if len(sessions) == 1 {
// shortcut for most common path
sess := sessions[0]
if seg, err = prepareForTranscoding(ctx, cxn, sess, seg, name); err != nil {
return nil, info, err
}
// cxn.sessManager.pushSegInFlight(sess, seg)
sess.pushSegInFlight(seg)
var res *ReceivedTranscodeResult
res, err = SubmitSegment(ctx, sess.Clone(), seg, nonce, calcPerceptualHash, verified)
if err != nil || res == nil {
if isNonRetryableError(err) {
cxn.sessManager.completeSession(sess)
return nil, info, err
}
cxn.sessManager.suspendAndRemoveOrch(sess)
if res == nil && err == nil {
err = errors.New("empty response")
}
return nil, info, err
}
// [EXPERIMENTAL] send content detection results to callback webhook
// for now use detection only in common path
if DetectionWebhookURL != nil && len(res.Detections) > 0 {
clog.V(common.DEBUG).Infof(ctx, "Got detection result %v", res.Detections)
go func(mid core.ManifestID, config core.DetectionConfig, seqNo uint64, detections []*net.DetectData) {
req := common.DetectionWebhookRequest{ManifestID: string(mid), SeqNo: seqNo}
for _, detection := range detections {
switch x := detection.Value.(type) {
case *net.DetectData_SceneClassification:
probs := x.SceneClassification.ClassProbs
// match returned probs (key: class id) with one of the user-selected class names
for _, name := range config.SelectedClassNames {
if id, ok := ffmpeg.DetectorClassIDLookup[name]; ok {
if prob, ok := probs[uint32(id)]; ok {
req.SceneClassification = append(req.SceneClassification,
common.SceneClassificationResult{
Name: name,
Probability: prob,
})
}
}
}
}
}
jsonValue, err := json.Marshal(req)
if err != nil {
clog.Errorf(ctx, "Unable to marshal detection result into JSON ")
return
}
resp, err := DetectionWhClient.Post(DetectionWebhookURL.String(), "application/json", bytes.NewBuffer(jsonValue))
if err != nil {
clog.Errorf(ctx, "Unable to POST detection result on webhook url=%v err=%q",
DetectionWebhookURL.Redacted(), err)
} else if resp.StatusCode < 200 || resp.StatusCode >= 300 {
rbody, rerr := ioutil.ReadAll(resp.Body)
resp.Body.Close()
if rerr != nil {
clog.Errorf(ctx, "Detection webhook returned error status=%v with unreadable body err=%q",
resp.StatusCode, rerr)
} else {
clog.Errorf(ctx, "Detection webhook returned error status=%v err=%q",
resp.StatusCode, string(rbody))
}
}
}(cxn.mid, cxn.params.Detection, seg.SeqNo, res.Detections)
}
// Ensure perceptual hash is generated if we ask for it
if calcPerceptualHash {
segmToCheckIndex := rand.Intn(len(res.Segments))
segHash, err := drivers.GetSegmentData(ctx, res.Segments[segmToCheckIndex].PerceptualHashUrl)
if err != nil || len(segHash) <= 0 {
err = fmt.Errorf("error downloading perceptual hash from url=%s err=%w",
res.Segments[segmToCheckIndex].PerceptualHashUrl, err)
return nil, info, err
}
}
urls, err = downloadResults(ctx, cxn, seg, sess, res, verifier)
return urls, info, err
} else {
resc := make(chan *SubmitResult, len(sessions))
submittedCount := 0
for _, sess := range sessions {
// todo: run it in own goroutine (move to submitSegment?)
seg2, err := prepareForTranscoding(ctx, cxn, sess, seg, name)
if err != nil || seg2 == nil {
continue
}
// cxn.sessManager.pushSegInFlight(sess, seg)
sess.pushSegInFlight(seg2)
go submitSegment(ctx, sess, seg2, nonce, calcPerceptualHash, resc)
submittedCount++
}
if submittedCount == 0 {
return nil, info, fmt.Errorf("error: not submitted anything")
}
sess, results, err := cxn.sessManager.chooseResults(ctx, resc, submittedCount)
if err != nil {
clog.Errorf(ctx, "Error choosing results: err=%q", err)
return nil, info, err
}
for _, usedSession := range sessions {
if usedSession != sess {
// return session that we're not using
cxn.sessManager.completeSession(usedSession)
}
}
urls, err = downloadResults(ctx, cxn, seg, sess, results, verifier)
return urls, info, err
}
}
type SubmitResult struct {
Session *BroadcastSession
TranscodeResult *ReceivedTranscodeResult
Err error
}
func submitSegment(ctx context.Context, sess *BroadcastSession, seg *stream.HLSSegment, nonce uint64, calcPerceptualHash bool, resc chan *SubmitResult) {
res, err := SubmitSegment(ctx, sess.Clone(), seg, nonce, calcPerceptualHash, false)
resc <- &SubmitResult{
Session: sess,
TranscodeResult: res,