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output.go
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output.go
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package main
import (
"bytes"
"fmt"
"math/rand"
"sync"
"sync/atomic"
"time"
rpb "github.com/blind-oracle/riemann-relay/riemannpb"
hhash "github.com/minio/highwayhash"
)
const (
ringIntervals = 1024
)
var (
hashKey = []byte{
0xf7, 0x74, 0x6b, 0xd7, 0xc2, 0x19, 0xe4, 0xa8,
0xc4, 0x8d, 0xc3, 0xd5, 0x0f, 0x7b, 0x1f, 0x54,
0x46, 0xa5, 0xdf, 0x7c, 0x64, 0x55, 0x1c, 0x8d,
0x77, 0x94, 0xbb, 0x5d, 0x9f, 0x63, 0x54, 0x63,
}
)
type output struct {
name string
typ outputType
algo outputAlgo
algoFailover bool
hashFields []riemannFieldName
riemannFields []riemannFieldName
riemannValue riemannValue
tgts []*target
tgtsAlive []*target
tgtsAliveMap map[int]*target
tgtsAliveRing []*target
tgtsAliveCnt int
tgtsRingIntervals uint64
tgtCnt int
tgtNext int
tgtMtx sync.Mutex
tgtsPool sync.Pool
wg sync.WaitGroup
getTargets func([]*target, []byte) int
stats struct {
received uint64
droppedNoTargetsAlive uint64
droppedBufferOverflow uint64
}
chanShutdown chan struct{}
rnd *rand.Rand
*logger
sync.RWMutex
}
func makeTargetsRing(tgts []*target) []*target {
rounded := (ringIntervals / len(tgts)) * len(tgts)
ring := make([]*target, rounded)
tgtCnt := len(tgts)
for i, j := 0, 0; i < rounded; i++ {
ring[i] = tgts[j]
if j++; j >= tgtCnt {
j = 0
}
}
return ring
}
func newOutput(c *outputCfg) (o *output, err error) {
typ, ok := outputTypeMap[c.Type]
if !ok {
return nil, fmt.Errorf("Unknown output type '%s'", c.Type)
}
algo, ok := outputAlgoMap[c.Algo]
if !ok {
return nil, fmt.Errorf("Unknown algorithm '%s'", c.Algo)
}
o = &output{
name: c.Name,
typ: typ,
algo: algo,
algoFailover: c.AlgoFailover,
tgtCnt: len(c.Targets),
tgtsAliveMap: map[int]*target{},
chanShutdown: make(chan struct{}),
rnd: rand.New(rand.NewSource(time.Now().UnixNano())),
logger: &logger{fmt.Sprintf("Output %s", c.Name)},
}
o.tgtsPool = sync.Pool{
New: func() interface{} {
return make([]*target, o.tgtCnt)
},
}
switch algo {
case outputAlgoFailover:
o.getTargets = o.getTargetsAlive
o.algoFailover = true
case outputAlgoRoundRobin:
o.getTargets = o.getTargetsRoundRobin
case outputAlgoHash:
o.getTargets = o.getTargetsHash
case outputAlgoBroadcast:
o.getTargets = o.getTargetsAlive
default:
return nil, fmt.Errorf("Unknown algo: %s", algo)
}
o.Infof("Starting output (type '%s', algo '%s')", typ, algo)
if algo == outputAlgoHash {
if o.hashFields, err = parseRiemannFields(c.HashFields, true); err != nil {
return
}
if len(o.hashFields) == 0 {
return nil, fmt.Errorf("You need to specify 'hash_fields'")
}
o.Infof("Hash fields: %v", o.hashFields)
}
switch typ {
case outputTypeCarbon, outputTypeClickhouse:
onlyStrings := true
if typ == outputTypeClickhouse {
onlyStrings = false
}
if o.riemannFields, err = parseRiemannFields(c.RiemannFields, onlyStrings); err != nil {
return
}
if len(o.riemannFields) == 0 {
return nil, fmt.Errorf("You need to specify 'riemann_fields' for this output type")
}
if o.riemannValue, ok = riemannValueMap[c.RiemannValue]; !ok {
return nil, fmt.Errorf("Unknown 'riemann_value': %s", c.RiemannValue)
}
o.Infof("Riemann fields: %v, value: %s", o.riemannFields, o.riemannValue)
}
for id, h := range c.Targets {
tgt, err := newOutputTgt(h, c, o)
if err != nil {
return nil, fmt.Errorf("Unable to create target '%s': %s", h, err)
}
tgt.id = id
o.tgts = append(o.tgts, tgt)
switch typ {
case outputTypeClickhouse, outputTypeFlatbuf:
for _, conn := range tgt.conns {
tgt.setConnAlive(conn.id, true)
}
}
}
if cfg.StatsInterval.Duration > 0 {
o.wg.Add(1)
go o.statsTicker()
}
o.Infof("Running")
return o, nil
}
func (o *output) pushBatch(batch []*rpb.Event) {
var (
key *bytes.Buffer
tgts = o.tgtsPool.Get().([]*target)
n int
droppedBufferOverflow uint64
)
if o.algo == outputAlgoHash {
key = bufferPoolSmall.Get().(*bytes.Buffer)
}
l := len(batch)
atomic.AddUint64(&o.stats.received, uint64(l))
promOutReceived.WithLabelValues(o.name).Add(float64(l))
o.RLock()
if o.tgtsAliveCnt == 0 {
atomic.AddUint64(&o.stats.droppedNoTargetsAlive, uint64(l))
promOutDroppedNoTargetsAlive.WithLabelValues(o.name).Add(float64(l))
o.RUnlock()
return
}
for _, e := range batch {
// Compute a list of targets to send
if key != nil {
eventWriteCompileFields(key, e, o.hashFields, '.')
n = o.getTargets(tgts, key.Bytes())
key.Reset()
} else {
n = o.getTargets(tgts, nil)
}
// Push the event to all selected targets
ok := false
for _, t := range tgts[:n] {
if t.push(e) {
ok = true
if o.algo != outputAlgoBroadcast {
break
}
} else {
if !o.algoFailover {
break
}
}
}
if !ok {
droppedBufferOverflow++
}
}
atomic.AddUint64(&o.stats.droppedBufferOverflow, droppedBufferOverflow)
promOutDroppedBufferFull.WithLabelValues(o.name).Add(float64(droppedBufferOverflow))
o.tgtsPool.Put(tgts)
if key != nil {
bufferPoolSmall.Put(key)
}
o.RUnlock()
}
func (o *output) setTgtAlive(id int, s bool) {
o.Lock()
if s {
o.tgtsAliveMap[id] = o.tgts[id]
} else {
delete(o.tgtsAliveMap, id)
}
o.tgtsAliveCnt = len(o.tgtsAliveMap)
o.tgtsAlive = make([]*target, o.tgtsAliveCnt)
i := 0
for _, v := range o.tgtsAliveMap {
o.tgtsAlive[i] = v
i++
}
if o.tgtsAliveCnt > 0 && o.algo == outputAlgoHash {
o.tgtsAliveRing = makeTargetsRing(o.tgtsAlive)
o.tgtsRingIntervals = uint64(len(o.tgtsAliveRing))
} else {
o.tgtsRingIntervals = 0
}
o.Unlock()
}
func (o *output) close() {
close(o.chanShutdown)
o.wg.Wait()
o.Warnf("Closing targets...")
for _, t := range o.tgts {
t.close()
}
o.Warnf("All targets closed")
}
func (o *output) getTargetsAlive(tgts []*target, key []byte) int {
return copy(tgts, o.tgtsAlive)
}
func (o *output) getTargetsRoundRobin(tgts []*target, key []byte) (n int) {
o.tgtMtx.Lock()
i := o.tgtNext
if o.tgtNext++; o.tgtNext >= o.tgtCnt {
o.tgtNext = 0
}
o.tgtMtx.Unlock()
j := 0
for j < o.tgtsAliveCnt {
tgts[j] = o.tgtsAlive[i]
j++
if i++; i >= o.tgtsAliveCnt {
i = 0
}
}
n = o.tgtsAliveCnt
return
}
func (o *output) getTargetsHash(tgts []*target, key []byte) (n int) {
i := hhash.Sum64(key, hashKey) % o.tgtsRingIntervals
j := 0
for j < o.tgtsAliveCnt {
tgts[j] = o.tgtsAliveRing[i]
j++
if i++; i >= o.tgtsRingIntervals {
i = 0
}
}
n = o.tgtsAliveCnt
return
}
func (o *output) statsTicker() {
tick := time.NewTicker(cfg.StatsInterval.Duration)
defer func() {
tick.Stop()
o.wg.Done()
}()
for {
select {
case <-o.chanShutdown:
return
case <-tick.C:
for _, r := range o.getStats() {
o.Infof(r)
}
}
}
}
func (o *output) getStats() (s []string) {
s = append(s, fmt.Sprintf("received %d droppedNoTargetsAlive %d droppedBufferOverflow %d",
atomic.LoadUint64(&o.stats.received),
atomic.LoadUint64(&o.stats.droppedNoTargetsAlive),
atomic.LoadUint64(&o.stats.droppedBufferOverflow),
))
o.RLock()
for _, t := range o.tgts {
s = append(s, fmt.Sprintf(" %s:", t.host))
s = append(s, t.getStats()...)
}
o.RUnlock()
return
}