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client.go
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client.go
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package fh
import (
"context"
"sync"
"sync/atomic"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/firehose"
"github.com/gallir/smart-relayer/lib"
"github.com/gallir/smart-relayer/redis"
)
const (
recordsTimeout = 15 * time.Second
maxRecordSize = 1000 * 1024 // The maximum size of a record sent to Kinesis Firehose, before base64-encoding, is 1000 KB
maxBatchRecords = 500 // The PutRecordBatch operation can take up to 500 records per call or 4 MB per call, whichever is smaller. This limit cannot be changed.
maxBatchSize = 4 * 1024 * 1024 // 4 MB per call
)
var (
clientCount int64 = 0
newLine = []byte("\n")
)
var pool = sync.Pool{
New: func() interface{} {
return make([]byte, 0)
},
}
// Client is the thread that connect to the remote redis server
type Client struct {
sync.Mutex
srv *Server
mode int
buff []byte
count int
batch []*firehose.Record
batchSize int
status int
finish chan bool
done chan bool
ID int
tick *time.Ticker
lastFlushed time.Time
}
// NewClient creates a new client that connect to a Redis server
func NewClient(srv *Server) *Client {
n := atomic.AddInt64(&clientCount, 1)
clt := &Client{
done: make(chan bool),
finish: make(chan bool),
status: 0,
srv: srv,
ID: int(n),
tick: time.NewTicker(recordsTimeout),
}
if err := clt.Reload(); err != nil {
lib.Debugf("Firehose client %d ERROR: reload %s", clt.ID, err)
return nil
}
lib.Debugf("Firehose client %d ready", clt.ID)
return clt
}
// Reload finish the listener and run it again
func (clt *Client) Reload() error {
clt.Lock()
defer clt.Unlock()
if clt.status > 0 {
clt.Exit()
}
go clt.listen()
return nil
}
func (clt *Client) listen() {
defer lib.Debugf("Firehose client %d: Closed listener", clt.ID)
clt.status = 1
clt.buff = pool.Get().([]byte)
for {
select {
case r := <-clt.srv.recordsCh:
recordSize := r.Len()
if recordSize <= 0 {
continue
}
var content []byte
if clt.srv.config.Compress {
// All the message will be compress. This will work with raw and json messages.
content = compress.Bytes(r.Bytes())
// Update the record size using the compression []byte result
recordSize = len(content)
} else {
// Just store the bytes
content = r.Bytes()
}
if recordSize+1 >= maxBatchSize {
lib.Debugf("Firehose client %d: EFRROR: one record is over the limit %d/%d", clt.ID, recordSize, maxBatchSize)
continue
}
// The PutRecordBatch operation can take up to 500 records per call or 4 MB per call, whichever is smaller. This limit cannot be changed.
if clt.count >= clt.srv.config.MaxRecords || len(clt.batch)+1 >= maxBatchRecords || clt.batchSize+recordSize+1 >= maxBatchSize {
// lib.Debugf("flush: count %d/%d | batch %d/%d | size [%d] %d/%d",
// clt.count, clt.srv.config.MaxRecords, len(clt.batch), maxBatchRecords, recordSize, (clt.batchSize+recordSize+1)/1024, maxBatchSize/1024)
// Force flush
clt.flush()
}
// The maximum size of a record sent to Kinesis Firehose, before base64-encoding, is 1000 KB.
if len(clt.buff)+recordSize+1 >= maxRecordSize || clt.count+1 >= clt.srv.config.MaxRecords {
// Save in new record
clt.appendRecord(clt.buff)
clt.buff = pool.Get().([]byte)
}
clt.buff = append(clt.buff, content...)
clt.buff = append(clt.buff, newLine...)
clt.count++
clt.batchSize += len(clt.buff)
case <-clt.tick.C:
if time.Since(clt.lastFlushed) >= recordsTimeout && (len(clt.buff) > 0 || len(clt.batch) > 0) {
if len(clt.buff) > 0 {
clt.appendRecord(clt.buff)
clt.buff = pool.Get().([]byte)
}
clt.flush()
}
case <-clt.done:
lib.Debugf("Firehose client %d: closing..", clt.ID)
clt.finish <- true
return
}
}
}
// appendRecord store the current buffer in a new record and append it to the batch
func (clt *Client) appendRecord(buff []byte) {
if len(buff) <= 0 {
// Don't create empty records
return
}
clt.batch = append(clt.batch, &firehose.Record{Data: buff})
}
// flush build the last record if need and send the records slice to AWS Firehose
func (clt *Client) flush() {
clt.lastFlushed = time.Now()
// Don't send empty batch
if len(clt.batch) == 0 {
return
}
// Send the batch to AWS Firehose
clt.putRecordBatch(clt.batch)
// Put slice in the pull after sent to AWS Firehose
for _, r := range clt.batch {
r.Data = r.Data[:0]
pool.Put(r.Data)
}
clt.batchSize = 0
clt.batch = nil
clt.count = 0
}
// putRecordBatch is the client connection to AWS Firehose
func (clt *Client) putRecordBatch(records []*firehose.Record) {
req, _ := clt.srv.awsSvc.PutRecordBatchRequest(&firehose.PutRecordBatchInput{
DeliveryStreamName: aws.String(clt.srv.config.StreamName),
Records: records,
})
ctx, cancel := context.WithTimeout(context.Background(), connectTimeout)
defer cancel()
req.SetContext(ctx)
err := req.Send()
if err != nil {
if req.IsErrorThrottle() {
lib.Debugf("Firehose client %d: ERROR IsErrorThrottle: %s", clt.ID, err)
} else {
lib.Debugf("Firehose client %d: ERROR PutRecordBatch->Send: %s", clt.ID, err)
}
clt.srv.failure()
return
}
lib.Debugf("Firehose client %d: sent batch with %d records, %d lines, %d bytes", clt.ID, len(records), clt.count, clt.batchSize)
}
// Exit finish the go routine of the client
func (clt *Client) Exit() {
defer lib.Debugf("Firehose client %d: Exit, %d records lost", clt.ID, len(clt.batch))
clt.done <- true
<-clt.finish
if len(clt.buff) > 0 {
clt.appendRecord(clt.buff)
}
clt.flush()
}