/
kinesis.go
135 lines (116 loc) · 3.19 KB
/
kinesis.go
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package outputlog
import (
"bytes"
"compress/gzip"
"encoding/json"
"io/ioutil"
"log"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/service/kinesis"
"github.com/ryotarai/paramedic/awsclient"
)
const kinesisStreamName = "paramedic-logs" // TODO: configurable
type KinesisReader struct {
Kinesis awsclient.Kinesis
StartTimestamp time.Time
LogGroup string
LogStreamPrefix string
shardIterator map[string]string // map[shard ID]iterator
}
type kinesisRecord struct {
MessageType string `json:"messageType"`
Owner string `json:"owner"`
LogGroup string `json:"logGroup"`
LogStream string `json:"logStream"`
SubscriptionFilters []string `json:"subscriptionFilters"`
LogEvents []kinesisLogEvent `json:"logEvents"`
}
type kinesisLogEvent struct {
ID string `json:"id"`
Timestamp int64 `json:"timestamp"`
Message string `json:"message"`
}
func (r *KinesisReader) Read() ([]*Event, error) {
if r.shardIterator == nil {
err := r.initShardIterator()
if err != nil {
return nil, err
}
}
events := []*Event{}
for shardID, iter := range r.shardIterator {
log.Printf("[DEBUG] Getting records from Kinesis Streams (shard ID: %s, iterator: %s)", shardID, iter)
resp, err := r.Kinesis.GetRecords(&kinesis.GetRecordsInput{
ShardIterator: aws.String(iter),
})
if err != nil {
return nil, err
}
r.shardIterator[shardID] = *resp.NextShardIterator
ev, err := r.recordsToEvents(resp.Records)
if err != nil {
return nil, err
}
events = append(events, ev...)
}
SortEventsByTimestamp(events)
return events, nil
}
func (r *KinesisReader) recordsToEvents(records []*kinesis.Record) ([]*Event, error) {
events := []*Event{}
for _, r1 := range records {
reader, err := gzip.NewReader(bytes.NewReader(r1.Data))
if err != nil {
return nil, err
}
b, err := ioutil.ReadAll(reader)
if err != nil {
return nil, err
}
r2 := kinesisRecord{}
err = json.Unmarshal(b, &r2)
if err != nil {
return nil, err
}
if r2.MessageType != "DATA_MESSAGE" {
continue // ignore
}
if r2.LogGroup != r.LogGroup || !strings.HasPrefix(r2.LogStream, r.LogStreamPrefix) {
continue // ignore
}
for _, e := range r2.LogEvents {
events = append(events, &Event{
Message: e.Message,
Timestamp: time.Unix(0, e.Timestamp*1000*1000),
LogStream: r2.LogStream,
})
}
}
return events, nil
}
func (r *KinesisReader) initShardIterator() error {
log.Printf("[DEBUG] Getting initial shart iterator")
r.shardIterator = map[string]string{}
resp, err := r.Kinesis.DescribeStream(&kinesis.DescribeStreamInput{
StreamName: aws.String(kinesisStreamName),
})
if err != nil {
return err
}
for _, s := range resp.StreamDescription.Shards {
id := *s.ShardId
resp, err := r.Kinesis.GetShardIterator(&kinesis.GetShardIteratorInput{
StreamName: aws.String(kinesisStreamName),
ShardId: aws.String(id),
ShardIteratorType: aws.String("AT_TIMESTAMP"),
Timestamp: aws.Time(r.StartTimestamp),
})
if err != nil {
return err
}
r.shardIterator[id] = *resp.ShardIterator
}
return nil
}