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main.go
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/
main.go
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/*************************************************************************
* Copyright 2018 Gravwell, Inc. All rights reserved.
* Contact: <legal@gravwell.io>
*
* This software may be modified and distributed under the terms of the
* BSD 2-clause license. See the LICENSE file for details.
**************************************************************************/
package main
import (
"context"
"encoding/json"
"fmt"
"net"
"os"
"sync"
"time"
"github.com/gravwell/gravwell/v3/ingest/entry"
"github.com/gravwell/gravwell/v3/ingest/log"
"github.com/gravwell/gravwell/v3/ingesters/base"
"github.com/gravwell/gravwell/v3/ingesters/utils"
"github.com/gravwell/gravwell/v3/sqs_common"
"github.com/gravwell/gravwell/v3/timegrinder"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/awserr"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/kinesis"
)
const (
defaultConfigLoc = `/opt/gravwell/etc/kinesis_ingest.conf`
defaultConfigDLoc = `/opt/gravwell/etc/kinesis_ingest.conf.d`
appName string = `kinesis`
)
var (
lg *log.Logger
debugOn bool
)
func main() {
var wg sync.WaitGroup
var cfg *cfgType
running := true
ibc := base.IngesterBaseConfig{
IngesterName: appName,
AppName: appName,
DefaultConfigLocation: defaultConfigLoc,
DefaultConfigOverlayLocation: defaultConfigDLoc,
GetConfigFunc: GetConfig,
}
ib, err := base.Init(ibc)
if err != nil {
fmt.Fprintf(os.Stderr, "failed to get configuration %v\n", err)
return
} else if err = ib.AssignConfig(&cfg); err != nil || cfg == nil {
fmt.Fprintf(os.Stderr, "failed to assign configuration %v %v\n", err, cfg == nil)
return
}
debugOn = ib.Verbose
lg = ib.Logger
igst, err := ib.GetMuxer()
if err != nil {
ib.Logger.FatalCode(0, "failed to get ingest connection", log.KVErr(err))
return
}
defer igst.Close()
ib.AnnounceStartup()
debugout("Started ingester muxer\n")
// Get the state file
stateFile, err := utils.NewState(cfg.Global.State_Store_Location, 0600)
if err != nil {
lg.Fatal("failed to open state file", log.KV("path", cfg.Global.State_Store_Location), log.KVErr(err))
}
stateMan := NewStateman(stateFile)
stateMan.Start()
defer stateMan.Close()
c, err := sqs_common.GetCredentials(cfg.Global.Credentials_Type, cfg.Global.AWS_Access_Key_ID, cfg.Global.AWS_Secret_Access_Key)
if err != nil {
lg.Fatal("obtaining credentials", log.KVErr(err))
}
dieChan := make(chan bool)
ctx, cancel := context.WithCancel(context.Background())
for _, stream := range cfg.KinesisStream {
tagid, err := igst.GetTag(stream.Tag_Name)
if err != nil {
lg.Fatal("failed to resolve tag", log.KV("tag", stream.Tag_Name), log.KV("stream", stream.Stream_Name), log.KVErr(err))
}
// make an aws session
sess, err := session.NewSession(&aws.Config{
Credentials: c,
Region: aws.String(stream.Region),
})
if err != nil {
lg.Fatal("creating session", log.KVErr(err))
}
// get a handle on kinesis
svc := kinesis.New(sess, aws.NewConfig().WithRegion(stream.Region))
// Get the list of shards
shards := []*kinesis.Shard{}
dsi := &kinesis.DescribeStreamInput{}
dsi.SetStreamName(stream.Stream_Name)
count := 0
for {
streamdesc, err := svc.DescribeStream(dsi)
if err != nil {
count++
lg.Error("failed to get stream description", log.KV("stream", stream.Stream_Name), log.KVErr(err))
if count >= 5 {
// give up and LOUDLY quit
lg.Fatal("giving up fetch stream description for stream after 5 attempts, exiting.", log.KV("stream", stream.Stream_Name))
}
time.Sleep(1 * time.Second)
continue
}
newshards := streamdesc.StreamDescription.Shards
shards = append(shards, newshards...)
if *streamdesc.StreamDescription.HasMoreShards {
dsi.SetExclusiveStartShardId(*(newshards[len(newshards)-1].ShardId))
} else {
break
}
}
debugout("Read %d shards from stream %s\n", len(shards), stream.Stream_Name)
// Now start up the metrics reporter
var metricsTrackers []*shardMetrics
if stream.Metrics_Interval > 0 {
go func(stream streamDef) {
for {
select {
case <-dieChan:
return
case <-time.After(time.Duration(stream.Metrics_Interval) * time.Second):
report := metricsReport{StreamName: stream.Stream_Name, ShardCount: len(shards)}
for i := range metricsTrackers {
l, b, e, r := metricsTrackers[i].ReadAndReset()
report.AverageLag += l
report.CompressedDataSize += b
report.EntryDataSize += e
report.KinesisRequests += r
}
report.AverageLag = report.AverageLag / int64(len(metricsTrackers))
if stream.JSON_Metrics {
jr, err := json.Marshal(report)
if err == nil {
lg.Infof("%v", string(jr))
}
} else {
lg.Info("stream stats",
log.KV("stream", stream.Stream_Name),
log.KV("shards", len(shards)),
log.KV("delay", report.AverageLag),
log.KV("compressedsize", report.CompressedDataSize),
log.KV("requestcount", report.KinesisRequests),
log.KV("size", report.EntryDataSize))
}
}
}
}(*stream)
}
for i, shard := range shards {
// Detect and skip closed shards
if shard.SequenceNumberRange != nil && shard.SequenceNumberRange.EndingSequenceNumber != nil {
lg.Info("shard appears closed, skipping", log.KV("shard", *shard.ShardId), log.KV("stream", stream.Stream_Name))
continue
}
//get timegrinder stood up
tcfg := timegrinder.Config{
EnableLeftMostSeed: true,
}
tgr, err := timegrinder.NewTimeGrinder(tcfg)
if err != nil {
lg.FatalCode(0, "failed to create timegrinder", log.KVErr(err))
return
} else if err := cfg.TimeFormat.LoadFormats(tgr); err != nil {
lg.FatalCode(0, "failed to load custom time formats", log.KVErr(err))
return
}
if stream.Assume_Local_Timezone {
tgr.SetLocalTime()
}
if stream.Timezone_Override != `` {
if err = tgr.SetTimezone(stream.Timezone_Override); err != nil {
lg.FatalCode(0, "failed to set timezone", log.KV("timezone", stream.Timezone_Override), log.KVErr(err))
return
}
}
go func(stream streamDef, shard kinesis.Shard, tagid entry.EntryTag, shardid int, tg *timegrinder.TimeGrinder) {
wg.Add(1)
defer wg.Done()
// set up timegrinder and other long-lived stuff
var src net.IP
if cfg.Global.Source_Override != `` {
// global override
src = net.ParseIP(cfg.Global.Source_Override)
if src == nil {
lg.Fatal("Global Source-Override is invalid")
}
}
// one processor set per shard
procset, err := cfg.Preprocessor.ProcessorSet(igst, stream.Preprocessor)
if err != nil {
lg.Fatal("preprocessor construction error", log.KVErr(err))
}
// make the shardMetrics and add it to the array
tracker := shardMetrics{}
metricsTrackers = append(metricsTrackers, &tracker)
if stream.Metrics_Interval == 0 {
// disable it
tracker.Disabled = true
}
reconnectLoop:
for {
gsii := &kinesis.GetShardIteratorInput{}
gsii.SetShardId(*shard.ShardId)
gsii.SetStreamName(stream.Stream_Name)
seqnum := stateMan.GetSequenceNum(stream.Stream_Name, *shard.ShardId)
if seqnum == `` {
// we don't have a previous state
debugout("No previous sequence number for stream %v shard %v, defaulting to %v\n", stream.Stream_Name, *shard.ShardId, stream.Iterator_Type)
gsii.SetShardIteratorType(stream.Iterator_Type)
} else {
gsii.SetShardIteratorType(`AFTER_SEQUENCE_NUMBER`)
gsii.SetStartingSequenceNumber(seqnum)
}
output, err := svc.GetShardIterator(gsii)
if err != nil {
lg.Error("error on shard", log.KV("number", shardid), log.KV("stream", stream.Stream_Name), log.KV("shard", *shard.ShardId), log.KVErr(err))
time.Sleep(5 * time.Second)
continue
}
if output.ShardIterator == nil {
// this is weird, we are going to bail out
lg.Error("got nil initial shard iterator, sleeping and retrying")
time.Sleep(5 * time.Second)
continue
}
iter := *output.ShardIterator
var lastSeqNum string
for running {
gri := &kinesis.GetRecordsInput{}
gri.SetLimit(5000)
gri.SetShardIterator(iter)
var res *kinesis.GetRecordsOutput
var err error
for {
res, err = svc.GetRecords(gri)
if res != nil {
if res.NextShardIterator != nil {
iter = *res.NextShardIterator
}
}
if err != nil {
if awsErr, ok := err.(awserr.Error); ok {
// process SDK error
if awsErr.Code() == kinesis.ErrCodeProvisionedThroughputExceededException {
lg.Warn("throughput exceeded, trying again", log.KV("shard", *shard.ShardId), log.KV("stream", stream.Stream_Name))
time.Sleep(500 * time.Millisecond)
} else if awsErr.Code() == kinesis.ErrCodeExpiredIteratorException {
lg.Info("Iterator expired, re-initializing", log.KV("shard", *shard.ShardId), log.KV("stream", stream.Stream_Name))
time.Sleep(100 * time.Millisecond)
continue reconnectLoop
} else {
lg.Error("answer error", log.KV("code", awsErr.Code()), log.KV("message", awsErr.Message()), log.KV("shard", *shard.ShardId), log.KV("stream", stream.Stream_Name))
time.Sleep(500 * time.Millisecond)
}
} else {
lg.Error("unknown error", log.KVErr(err))
}
} else {
// if we got no records, chill for a sec before we hit it again
if len(res.Records) == 0 {
time.Sleep(100 * time.Millisecond)
}
break
}
}
var entrySize int
for _, r := range res.Records {
lastSeqNum = *r.SequenceNumber
ent := &entry.Entry{
Tag: tagid,
SRC: src,
Data: r.Data,
}
if stream.Parse_Time == false {
ent.TS = entry.FromStandard(*r.ApproximateArrivalTimestamp)
} else {
ts, ok, err := tg.Extract(ent.Data)
if !ok || err != nil {
// something went wrong, switch to using kinesis timestamps
stream.Parse_Time = false
ent.TS = entry.FromStandard(*r.ApproximateArrivalTimestamp)
} else {
ent.TS = entry.FromStandard(ts)
}
}
if err = procset.ProcessContext(ent, ctx); err != nil {
lg.Error("Failed to handle entry", log.KVErr(err))
}
entrySize += int(ent.Size())
}
tracker.Update(res, entrySize)
// Now update the most recent sequence number
if lastSeqNum != `` {
stateMan.UpdateSequenceNum(stream.Stream_Name, *shard.ShardId, lastSeqNum)
}
}
if err = procset.Close(); err != nil {
lg.Error("Failed to close processor set", log.KVErr(err))
}
// if we get to this point, exit the for loop
break
}
}(*stream, *shard, tagid, i, tgr)
}
}
utils.WaitForQuit()
ib.AnnounceShutdown()
running = false
close(dieChan)
go func() {
time.Sleep(time.Second)
cancel()
}()
wg.Wait()
}
func debugout(format string, args ...interface{}) {
if debugOn {
fmt.Printf(format, args...)
}
}
type metricsReport struct {
StreamName string
ShardCount int
AverageLag int64
CompressedDataSize uint64
EntryDataSize uint64
KinesisRequests uint64
}
type shardMetrics struct {
sync.Mutex
Disabled bool
millisbehind int64
datasize uint64
entrysize uint64
requests uint64
}
func (s *shardMetrics) Update(res *kinesis.GetRecordsOutput, entrySize int) {
s.Lock()
defer s.Unlock()
if s.Disabled {
return
}
s.millisbehind = *res.MillisBehindLatest
s.requests++
var dsize int
for i := range res.Records {
dsize += len(res.Records[i].Data)
}
s.datasize += uint64(dsize)
s.entrysize += uint64(entrySize)
}
func (s *shardMetrics) ReadAndReset() (millis int64, datasize uint64, entrysize uint64, requests uint64) {
s.Lock()
defer s.Unlock()
millis = s.millisbehind
datasize = s.datasize
s.datasize = 0
entrysize = s.entrysize
s.entrysize = 0
requests = s.requests
s.requests = 0
return
}
type stateman struct {
sync.Mutex
states map[string]map[string]string // map of stream name to shard name to sequence number
stateFile *utils.State
}
func NewStateman(stateFile *utils.State) *stateman {
sm := stateman{
states: make(map[string]map[string]string),
stateFile: stateFile,
}
stateFile.Read(&sm.states)
return &sm
}
func (s *stateman) Start() {
go func() {
for {
select {
case <-time.After(15 * time.Second):
s.Flush()
}
}
}()
}
func (s *stateman) Close() {
s.Flush()
}
func (s *stateman) Flush() {
s.Lock()
defer s.Unlock()
s.stateFile.Write(s.states)
}
func (s *stateman) UpdateSequenceNum(stream, shard, seq string) {
s.Lock()
defer s.Unlock()
_, ok := s.states[stream]
if !ok {
// initialize the stream
s.states[stream] = make(map[string]string)
}
s.states[stream][shard] = seq
}
func (s *stateman) GetSequenceNum(stream, shard string) string {
s.Lock()
defer s.Unlock()
_, ok := s.states[stream]
if !ok {
// initialize the stream
s.states[stream] = make(map[string]string)
}
return s.states[stream][shard]
}