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process.go
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process.go
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// Copyright 2023 LiveKit, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package service
import (
"context"
"net/http"
"os/exec"
"sync"
"syscall"
"time"
"github.com/frostbyte73/core"
"github.com/prometheus/client_golang/prometheus"
dto "github.com/prometheus/client_model/go"
"github.com/livekit/egress/pkg/errors"
"github.com/livekit/egress/pkg/ipc"
"github.com/livekit/protocol/livekit"
"github.com/livekit/protocol/logger"
"github.com/livekit/protocol/rpc"
)
const launchTimeout = 10 * time.Second
type ProcessManager struct {
mu sync.RWMutex
activeHandlers map[string]*Process
}
func NewProcessManager() *ProcessManager {
return &ProcessManager{
activeHandlers: make(map[string]*Process),
}
}
func (pm *ProcessManager) Launch(
ctx context.Context,
handlerID string,
req *rpc.StartEgressRequest,
info *livekit.EgressInfo,
cmd *exec.Cmd,
tmpDir string,
) error {
ipcClient, err := ipc.NewHandlerClient(tmpDir)
if err != nil {
return err
}
p := &Process{
ctx: ctx,
handlerID: handlerID,
req: req,
info: info,
cmd: cmd,
ipcHandlerClient: ipcClient,
ready: make(chan struct{}),
}
pm.mu.Lock()
pm.activeHandlers[info.EgressId] = p
pm.mu.Unlock()
if err = cmd.Start(); err != nil {
logger.Errorw("could not launch process", err)
return err
}
select {
case <-p.ready:
return nil
case <-time.After(launchTimeout):
logger.Warnw("no response from handler", nil, "egressID", info.EgressId)
_ = cmd.Process.Kill()
_ = cmd.Wait()
return errors.ErrEgressNotFound
}
}
func (pm *ProcessManager) GetContext(egressID string) context.Context {
pm.mu.RLock()
defer pm.mu.RUnlock()
if p, ok := pm.activeHandlers[egressID]; ok {
return p.ctx
}
return context.Background()
}
func (pm *ProcessManager) HandlerStarted(egressID string) error {
pm.mu.RLock()
defer pm.mu.RUnlock()
if p, ok := pm.activeHandlers[egressID]; ok {
close(p.ready)
return nil
}
return errors.ErrEgressNotFound
}
func (pm *ProcessManager) GetActiveEgressIDs() []string {
pm.mu.RLock()
defer pm.mu.RUnlock()
egressIDs := make([]string, 0, len(pm.activeHandlers))
for egressID := range pm.activeHandlers {
egressIDs = append(egressIDs, egressID)
}
return egressIDs
}
func (pm *ProcessManager) GetStatus(info map[string]interface{}) {
pm.mu.RLock()
defer pm.mu.RUnlock()
for _, h := range pm.activeHandlers {
info[h.req.EgressId] = h.req.Request
}
}
func (pm *ProcessManager) GetGatherers() []prometheus.Gatherer {
pm.mu.RLock()
defer pm.mu.RUnlock()
handlers := make([]prometheus.Gatherer, 0, len(pm.activeHandlers))
for _, p := range pm.activeHandlers {
handlers = append(handlers, p)
}
return handlers
}
func (pm *ProcessManager) GetGRPCClient(egressID string) (ipc.EgressHandlerClient, error) {
pm.mu.RLock()
defer pm.mu.RUnlock()
h, ok := pm.activeHandlers[egressID]
if !ok {
return nil, errors.ErrEgressNotFound
}
return h.ipcHandlerClient, nil
}
func (pm *ProcessManager) KillAll() {
pm.mu.RLock()
defer pm.mu.RUnlock()
for _, h := range pm.activeHandlers {
h.kill()
}
}
func (pm *ProcessManager) KillProcess(egressID string, maxUsage float64) {
pm.mu.RLock()
defer pm.mu.RUnlock()
if h, ok := pm.activeHandlers[egressID]; ok {
err := errors.ErrCPUExhausted(maxUsage)
logger.Errorw("killing egress", err, "egressID", egressID)
now := time.Now().UnixNano()
h.info.Status = livekit.EgressStatus_EGRESS_FAILED
h.info.Error = err.Error()
h.info.ErrorCode = int32(http.StatusForbidden)
h.info.UpdatedAt = now
h.info.EndedAt = now
h.kill()
}
}
func (pm *ProcessManager) ProcessFinished(egressID string) {
pm.mu.Lock()
defer pm.mu.Unlock()
p, ok := pm.activeHandlers[egressID]
if ok {
p.closed.Break()
}
delete(pm.activeHandlers, egressID)
}
type Process struct {
ctx context.Context
handlerID string
req *rpc.StartEgressRequest
info *livekit.EgressInfo
cmd *exec.Cmd
ipcHandlerClient ipc.EgressHandlerClient
ready chan struct{}
closed core.Fuse
}
// Gather implements the prometheus.Gatherer interface on server-side to allow aggregation of handler ms
func (p *Process) Gather() ([]*dto.MetricFamily, error) {
// Get the ms from the handler via IPC
metricsResponse, err := p.ipcHandlerClient.GetMetrics(context.Background(), &ipc.MetricsRequest{})
if err != nil {
logger.Warnw("failed to obtain ms from handler", err, "egressID", p.req.EgressId)
return make([]*dto.MetricFamily, 0), nil // don't return an error, just skip this handler
}
// Parse the result to match the Gatherer interface
return deserializeMetrics(p.info.EgressId, metricsResponse.Metrics)
}
func (p *Process) kill() {
p.closed.Once(func() {
if err := p.cmd.Process.Signal(syscall.SIGINT); err != nil {
logger.Errorw("failed to kill Process", err, "egressID", p.req.EgressId)
}
})
}