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kafka.go
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kafka.go
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// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kafka
import (
"crypto/tls"
"crypto/x509"
"encoding/json"
"flag"
"io/ioutil"
"log"
"os"
"strings"
"time"
info "github.com/google/cadvisor/info/v1"
"github.com/google/cadvisor/storage"
"github.com/google/cadvisor/utils/container"
kafka "github.com/Shopify/sarama"
"k8s.io/klog"
)
func init() {
storage.RegisterStorageDriver("kafka", new)
kafka.Logger = log.New(os.Stderr, "[kafka]", log.LstdFlags)
}
var (
brokers = flag.String("storage_driver_kafka_broker_list", "localhost:9092", "kafka broker(s) csv")
topic = flag.String("storage_driver_kafka_topic", "stats", "kafka topic")
certFile = flag.String("storage_driver_kafka_ssl_cert", "", "optional certificate file for TLS client authentication")
keyFile = flag.String("storage_driver_kafka_ssl_key", "", "optional key file for TLS client authentication")
caFile = flag.String("storage_driver_kafka_ssl_ca", "", "optional certificate authority file for TLS client authentication")
verifySSL = flag.Bool("storage_driver_kafka_ssl_verify", true, "verify ssl certificate chain")
)
type kafkaStorage struct {
producer kafka.AsyncProducer
topic string
machineName string
}
type detailSpec struct {
Timestamp time.Time `json:"timestamp"`
MachineName string `json:"machine_name,omitempty"`
ContainerName string `json:"container_Name,omitempty"`
ContainerID string `json:"container_Id,omitempty"`
ContainerLabels map[string]string `json:"container_labels,omitempty"`
ContainerStats *info.ContainerStats `json:"container_stats,omitempty"`
}
func (driver *kafkaStorage) infoToDetailSpec(cInfo *info.ContainerInfo, stats *info.ContainerStats) *detailSpec {
timestamp := time.Now()
containerID := cInfo.ContainerReference.Id
containerLabels := cInfo.Spec.Labels
containerName := container.GetPreferredName(cInfo.ContainerReference)
detail := &detailSpec{
Timestamp: timestamp,
MachineName: driver.machineName,
ContainerName: containerName,
ContainerID: containerID,
ContainerLabels: containerLabels,
ContainerStats: stats,
}
return detail
}
func (driver *kafkaStorage) AddStats(cInfo *info.ContainerInfo, stats *info.ContainerStats) error {
detail := driver.infoToDetailSpec(cInfo, stats)
b, err := json.Marshal(detail)
driver.producer.Input() <- &kafka.ProducerMessage{
Topic: driver.topic,
Value: kafka.StringEncoder(b),
}
return err
}
func (self *kafkaStorage) Close() error {
return self.producer.Close()
}
func new() (storage.StorageDriver, error) {
machineName, err := os.Hostname()
if err != nil {
return nil, err
}
return newStorage(machineName)
}
func generateTLSConfig() (*tls.Config, error) {
if *certFile != "" && *keyFile != "" && *caFile != "" {
cert, err := tls.LoadX509KeyPair(*certFile, *keyFile)
if err != nil {
return nil, err
}
caCert, err := ioutil.ReadFile(*caFile)
if err != nil {
return nil, err
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
return &tls.Config{
Certificates: []tls.Certificate{cert},
RootCAs: caCertPool,
InsecureSkipVerify: *verifySSL,
}, nil
}
return nil, nil
}
func newStorage(machineName string) (storage.StorageDriver, error) {
config := kafka.NewConfig()
tlsConfig, err := generateTLSConfig()
if err != nil {
return nil, err
}
if tlsConfig != nil {
config.Net.TLS.Enable = true
config.Net.TLS.Config = tlsConfig
}
config.Producer.RequiredAcks = kafka.WaitForAll
brokerList := strings.Split(*brokers, ",")
klog.V(4).Infof("Kafka brokers:%q", *brokers)
producer, err := kafka.NewAsyncProducer(brokerList, config)
if err != nil {
return nil, err
}
ret := &kafkaStorage{
producer: producer,
topic: *topic,
machineName: machineName,
}
return ret, nil
}