func (this *SandboxFilter) Run(fr pipeline.FilterRunner, h pipeline.PluginHelper) (err error) {
inChan := fr.InChan()
ticker := fr.Ticker()
var (
ok = true
terminated = false
sample = true
blocking = false
backpressure = false
pack *pipeline.PipelinePack
retval int
msgLoopCount uint
injectionCount uint
startTime time.Time
slowDuration int64 = int64(this.pConfig.Globals.MaxMsgProcessDuration)
duration int64
capacity = cap(inChan) - 1
)
// We assign to the return value of Run() for errors in the closure so that
// the plugin runner can determine what caused the SandboxFilter to return.
this.sb.InjectMessage(func(payload, payload_type, payload_name string) int {
if injectionCount == 0 {
err = pipeline.TerminatedError("exceeded InjectMessage count")
return 2
}
injectionCount--
pack := h.PipelinePack(msgLoopCount)
if pack == nil {
err = pipeline.TerminatedError(fmt.Sprintf("exceeded MaxMsgLoops = %d",
this.pConfig.Globals.MaxMsgLoops))
return 3
}
if len(payload_type) == 0 { // heka protobuf message
hostname := pack.Message.GetHostname()
err := proto.Unmarshal([]byte(payload), pack.Message)
if err == nil {
// do not allow filters to override the following
pack.Message.SetType("heka.sandbox." + pack.Message.GetType())
pack.Message.SetLogger(fr.Name())
pack.Message.SetHostname(hostname)
} else {
return 1
}
} else {
pack.Message.SetType("heka.sandbox-output")
pack.Message.SetLogger(fr.Name())
pack.Message.SetPayload(payload)
ptype, _ := message.NewField("payload_type", payload_type, "file-extension")
pack.Message.AddField(ptype)
pname, _ := message.NewField("payload_name", payload_name, "")
pack.Message.AddField(pname)
}
if !fr.Inject(pack) {
return 4
}
atomic.AddInt64(&this.injectMessageCount, 1)
return 0
})
for ok {
select {
case pack, ok = <-inChan:
if !ok {
break
}
atomic.AddInt64(&this.processMessageCount, 1)
injectionCount = this.pConfig.Globals.MaxMsgProcessInject
msgLoopCount = pack.MsgLoopCount
if this.manager != nil { // only check for backpressure on dynamic plugins
// reading a channel length is generally fast ~1ns
// we need to check the entire chain back to the router
backpressure = len(inChan) >= capacity ||
fr.MatchRunner().InChanLen() >= capacity ||
len(h.PipelineConfig().Router().InChan()) >= capacity
}
// performing the timing is expensive ~40ns but if we are
// backpressured we need a decent sample set before triggering
// termination
if sample ||
(backpressure && this.processMessageSamples < int64(capacity)) ||
this.sbc.Profile {
startTime = time.Now()
sample = true
}
retval = this.sb.ProcessMessage(pack)
if sample {
duration = time.Since(startTime).Nanoseconds()
this.reportLock.Lock()
this.processMessageDuration += duration
this.processMessageSamples++
if this.sbc.Profile {
this.profileMessageDuration = this.processMessageDuration
this.profileMessageSamples = this.processMessageSamples
if this.profileMessageSamples == int64(capacity)*10 {
this.sbc.Profile = false
// reset the normal sampling so it isn't heavily skewed by the profile values
// i.e. process messages fast during profiling and then switch to malicious code
this.processMessageDuration = this.profileMessageDuration / this.profileMessageSamples
this.processMessageSamples = 1
}
}
this.reportLock.Unlock()
}
if retval <= 0 {
if backpressure && this.processMessageSamples >= int64(capacity) {
if this.processMessageDuration/this.processMessageSamples > slowDuration ||
fr.MatchRunner().GetAvgDuration() > slowDuration/5 {
terminated = true
blocking = true
}
}
if retval < 0 {
atomic.AddInt64(&this.processMessageFailures, 1)
em := this.sb.LastError()
if len(em) > 0 {
fr.LogError(errors.New(em))
}
}
sample = 0 == rand.Intn(this.sampleDenominator)
} else {
terminated = true
}
pack.Recycle()
case t := <-ticker:
injectionCount = this.pConfig.Globals.MaxMsgTimerInject
startTime = time.Now()
if retval = this.sb.TimerEvent(t.UnixNano()); retval != 0 {
terminated = true
}
duration = time.Since(startTime).Nanoseconds()
this.reportLock.Lock()
this.timerEventDuration += duration
this.timerEventSamples++
this.reportLock.Unlock()
}
if terminated {
pack := h.PipelinePack(0)
pack.Message.SetType("heka.sandbox-terminated")
pack.Message.SetLogger(pipeline.HEKA_DAEMON)
message.NewStringField(pack.Message, "plugin", fr.Name())
if blocking {
pack.Message.SetPayload("sandbox is running slowly and blocking the router")
// no lock on the ProcessMessage variables here because there are no active writers
message.NewInt64Field(pack.Message, "ProcessMessageCount", this.processMessageCount, "count")
message.NewInt64Field(pack.Message, "ProcessMessageFailures", this.processMessageFailures, "count")
message.NewInt64Field(pack.Message, "ProcessMessageSamples", this.processMessageSamples, "count")
message.NewInt64Field(pack.Message, "ProcessMessageAvgDuration",
this.processMessageDuration/this.processMessageSamples, "ns")
message.NewInt64Field(pack.Message, "MatchAvgDuration", fr.MatchRunner().GetAvgDuration(), "ns")
message.NewIntField(pack.Message, "FilterChanLength", len(inChan), "count")
message.NewIntField(pack.Message, "MatchChanLength", fr.MatchRunner().InChanLen(), "count")
message.NewIntField(pack.Message, "RouterChanLength", len(h.PipelineConfig().Router().InChan()), "count")
} else {
pack.Message.SetPayload(this.sb.LastError())
}
fr.Inject(pack)
break
}
}
if this.manager != nil {
this.manager.PluginExited()
}
this.reportLock.Lock()
var destroyErr error
if this.sbc.PreserveData {
destroyErr = this.sb.Destroy(this.preservationFile)
} else {
destroyErr = this.sb.Destroy("")
}
if destroyErr != nil {
err = destroyErr
}
this.sb = nil
this.reportLock.Unlock()
return
}
