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kaf.go
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kaf.go
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package main
import (
"fmt"
"io"
"crypto/tls"
"crypto/x509"
"io/ioutil"
"log"
"os"
"github.com/Shopify/sarama"
"github.com/mattn/go-colorable"
"github.com/spf13/cobra"
"github.com/birdayz/kaf/pkg/avro"
"github.com/birdayz/kaf/pkg/config"
"github.com/birdayz/kaf/pkg/proto"
)
var cfgFile string
func getConfig() (saramaConfig *sarama.Config) {
saramaConfig = sarama.NewConfig()
saramaConfig.Version = sarama.V1_1_0_0
saramaConfig.Producer.Return.Successes = true
cluster := currentCluster
if cluster.Version != "" {
parsedVersion, err := sarama.ParseKafkaVersion(cluster.Version)
if err != nil {
errorExit("Unable to parse Kafka version: %v\n", err)
}
saramaConfig.Version = parsedVersion
}
if cluster.SASL != nil {
saramaConfig.Net.SASL.Enable = true
saramaConfig.Net.SASL.User = cluster.SASL.Username
saramaConfig.Net.SASL.Password = cluster.SASL.Password
}
if cluster.TLS != nil && cluster.SecurityProtocol != "SASL_SSL" {
saramaConfig.Net.TLS.Enable = true
tlsConfig := &tls.Config{
InsecureSkipVerify: cluster.TLS.Insecure,
}
if cluster.TLS.Cafile != "" {
caCert, err := ioutil.ReadFile(cluster.TLS.Cafile)
if err != nil {
errorExit("Unable to read Cafile :%v\n", err)
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
tlsConfig.RootCAs = caCertPool
}
if cluster.TLS.Clientfile != "" && cluster.TLS.Clientkeyfile != "" {
clientCert, err := ioutil.ReadFile(cluster.TLS.Clientfile)
if err != nil {
errorExit("Unable to read Clientfile :%v\n", err)
}
clientKey, err := ioutil.ReadFile(cluster.TLS.Clientkeyfile)
if err != nil {
errorExit("Unable to read Clientkeyfile :%v\n", err)
}
cert, err := tls.X509KeyPair([]byte(clientCert), []byte(clientKey))
if err != nil {
errorExit("Unable to create KeyPair: %v\n", err)
}
tlsConfig.Certificates = []tls.Certificate{cert}
// nolint
tlsConfig.BuildNameToCertificate()
}
saramaConfig.Net.TLS.Config = tlsConfig
}
if cluster.SecurityProtocol == "SASL_SSL" {
saramaConfig.Net.TLS.Enable = true
if cluster.TLS != nil {
tlsConfig := &tls.Config{
InsecureSkipVerify: cluster.TLS.Insecure,
}
if cluster.TLS.Cafile != "" {
caCert, err := ioutil.ReadFile(cluster.TLS.Cafile)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
caCertPool := x509.NewCertPool()
caCertPool.AppendCertsFromPEM(caCert)
tlsConfig.RootCAs = caCertPool
}
saramaConfig.Net.TLS.Config = tlsConfig
} else {
saramaConfig.Net.TLS.Config = &tls.Config{InsecureSkipVerify: false}
}
if cluster.SASL.Mechanism == "SCRAM-SHA-512" {
saramaConfig.Net.SASL.SCRAMClientGeneratorFunc = func() sarama.SCRAMClient { return &XDGSCRAMClient{HashGeneratorFcn: SHA512} }
saramaConfig.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypeSCRAMSHA512)
} else if cluster.SASL.Mechanism == "SCRAM-SHA-256" {
saramaConfig.Net.SASL.SCRAMClientGeneratorFunc = func() sarama.SCRAMClient { return &XDGSCRAMClient{HashGeneratorFcn: SHA256} }
saramaConfig.Net.SASL.Mechanism = sarama.SASLMechanism(sarama.SASLTypeSCRAMSHA256)
}
}
return saramaConfig
}
var (
outWriter io.Writer = os.Stdout
errWriter io.Writer = os.Stderr
inReader io.Reader = os.Stdin
colorableOut io.Writer = colorable.NewColorableStdout()
)
var rootCmd = &cobra.Command{
Use: "kaf",
Short: "Kafka Command Line utility for cluster management",
PersistentPreRun: func(cmd *cobra.Command, args []string) {
outWriter = cmd.OutOrStdout()
errWriter = cmd.ErrOrStderr()
inReader = cmd.InOrStdin()
if outWriter != os.Stdout {
colorableOut = outWriter
}
},
}
func main() {
if err := rootCmd.Execute(); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
var cfg config.Config
var currentCluster *config.Cluster
var (
brokersFlag []string
schemaRegistryURL string
protoFiles []string
protoExclude []string
verbose bool
clusterOverride string
)
func init() {
rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.kaf/config)")
rootCmd.PersistentFlags().StringSliceVarP(&brokersFlag, "brokers", "b", nil, "Comma separated list of broker ip:port pairs")
rootCmd.PersistentFlags().StringVar(&schemaRegistryURL, "schema-registry", "", "URL to a Confluent schema registry. Used for attempting to decode Avro-encoded messages")
rootCmd.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "Whether to turn on sarama logging")
rootCmd.PersistentFlags().StringVarP(&clusterOverride, "cluster", "c", "", "set a temporary current cluster")
cobra.OnInitialize(onInit)
}
var setupProtoDescriptorRegistry = func(cmd *cobra.Command, args []string) {
if protoType != "" {
r, err := proto.NewDescriptorRegistry(protoFiles, protoExclude)
if err != nil {
errorExit("Failed to load protobuf files: %v\n", err)
}
reg = r
}
}
func onInit() {
var err error
cfg, err = config.ReadConfig(cfgFile)
if err != nil {
errorExit("Invalid config: %v", err)
}
cfg.ClusterOverride = clusterOverride
cluster := cfg.ActiveCluster()
if cluster != nil {
// Use active cluster from config
currentCluster = cluster
} else {
// Create sane default if not configured
currentCluster = &config.Cluster{
Brokers: []string{"localhost:9092"},
}
}
// Any set flags override the configuration
if schemaRegistryURL != "" {
currentCluster.SchemaRegistryURL = schemaRegistryURL
}
if brokersFlag != nil {
currentCluster.Brokers = brokersFlag
}
if verbose {
sarama.Logger = log.New(errWriter, "[sarama] ", log.Lshortfile|log.LstdFlags)
}
}
func getClusterAdmin() (admin sarama.ClusterAdmin) {
clusterAdmin, err := sarama.NewClusterAdmin(currentCluster.Brokers, getConfig())
if err != nil {
errorExit("Unable to get cluster admin: %v\n", err)
}
return clusterAdmin
}
func getClient() (client sarama.Client) {
client, err := sarama.NewClient(currentCluster.Brokers, getConfig())
if err != nil {
errorExit("Unable to get client: %v\n", err)
}
return client
}
func getClientFromConfig(config *sarama.Config) (client sarama.Client) {
client, err := sarama.NewClient(currentCluster.Brokers, config)
if err != nil {
errorExit("Unable to get client: %v\n", err)
}
return client
}
func getSchemaCache() (cache *avro.SchemaCache) {
if currentCluster.SchemaRegistryURL == "" {
return nil
}
cache, err := avro.NewSchemaCache(currentCluster.SchemaRegistryURL)
if err != nil {
errorExit("Unable to get schema cache :%v\n", err)
}
return cache
}
func errorExit(format string, a ...interface{}) {
fmt.Fprintf(errWriter, format+"\n", a...)
os.Exit(1)
}