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config.go
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config.go
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// Config is put into a different package to prevent cyclic imports in case
// it is needed in several locations
package config
import (
"github.com/apache/pulsar-client-go/pulsar"
"github.com/pkg/errors"
"strconv"
"time"
)
type Config struct {
Client pulsarClientOptions `config:"client"`
Consumer pulsarConsumerOptions `config:"consumer"`
}
type pulsarClientOptions struct {
URL string `config:"url" validate:"required"`
ConnectionTimeout time.Duration `config:"connection_timeout" validate:"min=0"`
OperationTimeout time.Duration `config:"operation_timeout" validate:"min=0"`
AuthenticationTLS authenticationTLS `config:"authentication_tls"`
AuthenticationAthenz map[string]string `config:"authentication_athenz"`
TLSTrustCertsFilePath string `config:"tls_trust_certs_file_path"`
TLSAllowInsecureConnection bool `config:"tls_allow_insecure_connection"`
TLSValidateHostname bool `config:"tls_validate_hostname"`
MaxConnectionsPerBroker int `config:"max_connections_per_broker"`
}
type authenticationTLS struct {
CertificatePath string `config:"certificate_path"`
PrivateKeyPath string `config:"private_key_path"`
}
type pulsarConsumerOptions struct {
Topic string `config:"topic"`
Topics []string `config:"topics"`
TopicsPattern string `config:"topics_pattern"`
AutoDiscoveryPeriod time.Duration `config:"auto_discovery_period" validate:"min=0"`
SubscriptionName string `config:"subscription_name" validate:"required"`
Properties map[string]string `config:"properties"`
Type string `config:"subscription_type"`
SubscriptionInitialPosition string `config:"subscription_initial_position"`
ReceiverQueueSize int `config:"receiver_queue_size"`
NackRedeliveryDelay time.Duration `config:"nack_redelivery_delay" validate:"min=0"`
Name string `config:"name"`
ReadCompacted bool `config:"read_compacted"`
ReplicateSubscriptionState bool `config:"replicate_subscription_state"`
NumWorkers int `config:"num_workers" validate:"min=1"`
}
type authProvider int
const (
authProviderNone authProvider = iota
authProviderTLS
authProviderAthenz
)
var DefaultConfig = Config{
Client: pulsarClientOptions{
URL: "pulsar://localhost:6650",
ConnectionTimeout: 20 * time.Second,
},
Consumer: pulsarConsumerOptions{
Topic: "my-topic",
SubscriptionName: "my-sub",
NumWorkers: 1,
},
}
func (c *pulsarClientOptions) authValidate() (authProvider, error) {
if len(c.AuthenticationAthenz) == 0 &&
c.AuthenticationTLS.CertificatePath == "" && c.AuthenticationTLS.PrivateKeyPath == "" {
return authProviderNone, nil
}
var ok bool
if len(c.AuthenticationAthenz) != 0 {
_, ok = c.AuthenticationAthenz["providerDomain"]
if !ok {
return authProviderAthenz, errors.New("Athenz providerDomain is not configured")
}
_, ok = c.AuthenticationAthenz["tenantDomain"]
if !ok {
return authProviderAthenz, errors.New("Athenz tenantDomain is not configured")
}
_, ok = c.AuthenticationAthenz["tenantService"]
if !ok {
return authProviderAthenz, errors.New("Athenz tenantService is not configured")
}
_, ok = c.AuthenticationAthenz["privateKey"]
if !ok {
return authProviderAthenz, errors.New("Athenz privateKey is not configured")
}
_, ok = c.AuthenticationAthenz["keyId"]
if !ok {
return authProviderAthenz, errors.New("Athenz keyId is not configured")
}
_, ok = c.AuthenticationAthenz["ztsUrl"]
if !ok {
return authProviderAthenz, errors.New("Athenz ztsUrl is not configured")
}
if c.AuthenticationTLS.CertificatePath != "" || c.AuthenticationTLS.PrivateKeyPath != "" {
return authProviderNone, errors.New("Multiple authentication settings are configured")
}
return authProviderAthenz, nil
} else {
if c.AuthenticationTLS.CertificatePath == "" {
return authProviderTLS, errors.New("TLS certificatePath is not configured")
}
if c.AuthenticationTLS.PrivateKeyPath == "" {
return authProviderTLS, errors.New("TLS privateKeyPath is not configured")
}
return authProviderTLS, nil
}
}
func NewPulsarClient(clientOptions pulsarClientOptions) (*pulsar.Client, error) {
var clientConfig pulsar.ClientOptions
clientConfig.URL = clientOptions.URL
clientConfig.ConnectionTimeout = clientOptions.ConnectionTimeout
clientConfig.OperationTimeout = clientOptions.OperationTimeout
clientConfig.TLSTrustCertsFilePath = clientOptions.TLSTrustCertsFilePath
clientConfig.TLSAllowInsecureConnection = clientOptions.TLSAllowInsecureConnection
clientConfig.TLSValidateHostname = clientOptions.TLSValidateHostname
clientConfig.MaxConnectionsPerBroker = clientOptions.MaxConnectionsPerBroker
auth, err := clientOptions.authValidate()
if err != nil {
return nil, errors.Wrap(err, "Invalid Authentication Settings")
}
switch auth {
case authProviderAthenz:
clientConfig.Authentication = pulsar.NewAuthenticationAthenz(clientOptions.AuthenticationAthenz)
case authProviderTLS:
clientConfig.Authentication = pulsar.NewAuthenticationTLS(clientOptions.AuthenticationTLS.CertificatePath,
clientOptions.AuthenticationTLS.PrivateKeyPath)
default:
}
client, err := pulsar.NewClient(clientConfig)
if err != nil {
return nil, errors.Wrap(err, "Initializing pulsar client")
}
return &client, nil
}
func NewPulsarConsumer(client *pulsar.Client, consumerOptions pulsarConsumerOptions) (*[]pulsar.Consumer, error) {
var consumerConfig pulsar.ConsumerOptions
consumerConfig.Topic = consumerOptions.Topic
consumerConfig.AutoDiscoveryPeriod = consumerOptions.AutoDiscoveryPeriod
consumerConfig.SubscriptionName = consumerOptions.SubscriptionName
consumerConfig.Properties = consumerOptions.Properties
switch consumerOptions.Type {
case "Shared":
consumerConfig.Type = pulsar.Shared
case "Failover":
consumerConfig.Type = pulsar.Failover
case "KeyShared":
consumerConfig.Type = pulsar.KeyShared
default:
consumerConfig.Type = pulsar.Exclusive
}
if consumerOptions.SubscriptionInitialPosition == "Earliest" {
consumerConfig.SubscriptionInitialPosition = pulsar.SubscriptionPositionEarliest
} else {
consumerConfig.SubscriptionInitialPosition = pulsar.SubscriptionPositionLatest
}
consumerConfig.ReceiverQueueSize = consumerOptions.ReceiverQueueSize
consumerConfig.NackRedeliveryDelay = consumerOptions.NackRedeliveryDelay
consumerConfig.ReadCompacted = consumerOptions.ReadCompacted
consumerConfig.ReplicateSubscriptionState = consumerOptions.ReplicateSubscriptionState
var consumers []pulsar.Consumer
for i := 1; i <= consumerOptions.NumWorkers; i++ {
consumerConfig.Name = consumerOptions.Name + "-" + strconv.Itoa(i)
consumer, err := (*client).Subscribe(consumerConfig)
if err != nil {
return nil, errors.Wrap(err, "Initializing pulsar consumer")
}
consumers = append(consumers, consumer)
}
return &consumers, nil
}