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connection.go
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connection.go
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package superstream
import (
"encoding/json"
"fmt"
"strings"
"time"
"github.com/IBM/sarama"
"github.com/nats-io/nats.go"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protodesc"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/types/descriptorpb"
)
const (
clientReconnectionUpdateSubject = "internal.clientReconnectionUpdate"
clientTypeUpdateSubject = "internal.clientTypeUpdate"
clientRegisterSubject = "internal.registerClient"
superstreamLearningSubject = "internal.schema.learnSchema.%v"
superstreamRegisterSchemaSubject = "internal_tasks.schema.registerSchema.%v"
superstreamClientUpdatesSubject = "internal.updates.%v"
superstreamGetSchemaSubject = "internal.schema.getSchema.%v"
superstreamErrorSubject = "internal.clientErrors"
superstreamClientsUpdateSubject = "internal_tasks.clientsUpdate.%v.%v"
superstreamInternalUsername = "superstream_internal"
)
type Option func(*Options) error
type Options struct {
Host string
LearningFactor int
ConsumerGroup string
Servers string
}
type RegisterResp struct {
ClientID int `json:"client_id"`
AccountName string `json:"account_name"`
LearningFactor int `json:"learning_factor"`
}
type RegisterReq struct {
NatsConnectionID string `json:"nats_connection_id"`
Language string `json:"language"`
Version string `json:"version"`
LearningFactor int `json:"learning_factor"`
Config ClientConfig `json:"config"`
}
type ClientReconnectionUpdateReq struct {
NewNatsConnectionID string `json:"new_nats_connection_id"`
ClientID int `json:"client_id"`
}
type ClientTypeUpdateReq struct {
ClientID int `json:"client_id"`
Type string `json:"type"`
}
type ClientUpdateSub struct {
ClientID int
Subscription *nats.Subscription
UpdateCahn chan Update
}
type Update struct {
Type string
Payload []byte
}
type SchemaUpdateReq struct {
MasterMsgName string `json:"master_msg_name"`
FileName string `json:"file_name"`
SchemaID string `json:"schema_id"`
Desc []byte `json:"desc"`
}
type GetSchemaReq struct {
SchemaID string `json:"schema_id"`
}
type ClientConfig struct {
ClientType string `json:"client_type"`
ProducerMaxMessageBytes int `json:"producer_max_messages_bytes"`
ProducerRequiredAcks string `json:"producer_required_acks"`
ProducerTimeout time.Duration `json:"producer_timeout"`
ProducerRetryMax int `json:"producer_retry_max"`
ProducerRetryBackoff time.Duration `json:"producer_retry_backoff"`
ProducerReturnErrors bool `json:"producer_return_errors"`
ProducerReturnSuccesses bool `json:"producer_return_successes"`
ProducerFlushMaxMessages int `json:"producer_flush_max_messages"`
ProducerCompressionLevel string `json:"producer_compression_level"`
ConsumerFetchMin int32 `json:"consumer_fetch_min"`
ConsumerFetchDefault int32 `json:"consumer_fetch_default"`
ConsumerRetryBackOff time.Duration `json:"consumer_retry_backoff"`
ConsumerMaxWaitTime time.Duration `json:"consumer_max_wait_time"`
ConsumerMaxProcessingTime time.Duration `json:"consumer_mex_processing_time"`
ConsumerReturnErrors bool `json:"consumer_return_errors"`
ConsumerOffsetAutoCommitEnable bool `json:"consumer_offset_auto_commit_enable"`
ConsumerOffsetAutoCommintInterval time.Duration `json:"consumer_offset_auto_commit_interval"`
ConsumerOffsetsInitial int `json:"consumer_offsets_initial"`
ConsumerOffsetsRetryMax int `json:"consumer_offsets_retry_max"`
ConsumerGroupSessionTimeout time.Duration `json:"consumer_group_session_timeout"`
ConsumerGroupHeartBeatInterval time.Duration `json:"consumer_group_heart_beat_interval"`
ConsumerGroupRebalanceTimeout time.Duration `json:"consumer_group_rebalance_timeout"`
ConsumerGroupRebalanceRetryMax int `json:"consumer_group_rebalance_retry_max"`
ConsumerGroupRebalanceRetryBackOff time.Duration `json:"consumer_group_rebalance_retry_back_off"`
ConsumerGroupRebalanceResetInvalidOffsets bool `json:"consumer_group_rebalance_reset_invalid_offsets"`
ConsumerGroupId string `json:"consumer_group_id"`
Servers string `json:"servers"`
ProducerTopicsPartitions map[string][]int32 `json:"producer_topics_partitions"`
ConsumerTopicsPartitions map[string][]int32 `json:"consumer_group_topics_partitions"`
}
type TopicsPartitionsPerProducerConsumer struct {
ProducerTopicsPartitions map[string][]int32 `json:"producer_topics_partitions"`
ConsumerTopicsPartitions map[string][]int32 `json:"consumer_group_topics_partitions"`
}
type Client struct {
ClientID int
AccountName string
NatsConnectionID string
IsConsumer bool
IsProducer bool
LearningFactor int
LearningFactorCounter int
LearningRequestSent bool
GetSchemaRequestSent bool
ProducerProtoDesc protoreflect.MessageDescriptor
ProducerSchemaID string
ConsumerProtoDescMap map[string]protoreflect.MessageDescriptor
Counters ClientCounters
Config ClientConfig
}
var BrokerConnection *nats.Conn
var JSContext nats.JetStreamContext
var NatsConnectionID string
type ClientCounters struct {
TotalBytesBeforeReduction int64 `json:"total_bytes_before_reduction"`
TotalBytesAfterReduction int64 `json:"total_bytes_after_reduction"`
TotalMessagesSuccessfullyProduce int `json:"total_messages_successfully_produce"`
TotalMessagesSuccessfullyConsumed int `json:"total_messages_successfully_consumed"`
TotalMessagesFailedProduce int `json:"total_messages_failed_produce"`
TotalMessagesFailedConsume int `json:"total_messages_failed_consume"`
}
var Clients map[int]*Client
func ConfigHandler(clientType string, config *sarama.Config) ClientConfig {
producerConfig := config.Producer
consumerConfig := config.Consumer
var requiredAcks string
switch config.Producer.RequiredAcks {
case 0:
requiredAcks = "NoResponse"
case 1:
requiredAcks = "WaitForLocal"
case -1:
requiredAcks = "WaitForAll"
}
var compressionLevel string
switch config.Producer.CompressionLevel {
case 0:
compressionLevel = "CompressionNone"
case 1:
compressionLevel = "CompressionGZIP"
case 2:
compressionLevel = "CompressionSnappy"
case 3:
compressionLevel = "CompressionZSTD"
case 0x08:
compressionLevel = "compressionCodecMask"
case 5:
compressionLevel = "timestampTypeMask"
case -1000:
compressionLevel = "CompressionLevelDefault"
default:
compressionLevel = "CompressionLevelDefault"
}
conf := ClientConfig{
ClientType: clientType,
ProducerMaxMessageBytes: producerConfig.MaxMessageBytes,
ProducerRequiredAcks: requiredAcks,
ProducerTimeout: producerConfig.Timeout,
ProducerRetryMax: producerConfig.Retry.Max,
ProducerRetryBackoff: producerConfig.Retry.Backoff,
ProducerReturnErrors: producerConfig.Return.Errors,
ProducerReturnSuccesses: producerConfig.Return.Successes,
ProducerFlushMaxMessages: producerConfig.Flush.MaxMessages,
ProducerCompressionLevel: compressionLevel,
ConsumerFetchMin: consumerConfig.Fetch.Min,
ConsumerFetchDefault: consumerConfig.Fetch.Default,
ConsumerRetryBackOff: consumerConfig.Retry.Backoff,
ConsumerMaxWaitTime: consumerConfig.MaxWaitTime,
ConsumerMaxProcessingTime: consumerConfig.MaxProcessingTime,
ConsumerReturnErrors: consumerConfig.Return.Errors,
ConsumerOffsetAutoCommitEnable: consumerConfig.Offsets.AutoCommit.Enable,
ConsumerOffsetAutoCommintInterval: consumerConfig.Offsets.AutoCommit.Interval,
ConsumerOffsetsInitial: int(consumerConfig.Offsets.Initial),
ConsumerOffsetsRetryMax: consumerConfig.Offsets.Retry.Max,
ConsumerGroupSessionTimeout: consumerConfig.Group.Session.Timeout,
ConsumerGroupHeartBeatInterval: consumerConfig.Group.Heartbeat.Interval,
ConsumerGroupRebalanceTimeout: consumerConfig.Group.Rebalance.Timeout,
ConsumerGroupRebalanceRetryMax: consumerConfig.Group.Rebalance.Retry.Max,
ConsumerGroupRebalanceRetryBackOff: consumerConfig.Group.Rebalance.Retry.Backoff,
ConsumerGroupRebalanceResetInvalidOffsets: consumerConfig.Group.ResetInvalidOffsets,
}
return conf
}
func Init(token, host string, config interface{}, options ...Option) *sarama.Config {
sconfig := config.(*sarama.Config)
newConfig := *sconfig
if Clients == nil {
Clients = make(map[int]*Client)
}
opts := GetDefaultOptions()
for _, opt := range options {
if opt != nil {
if err := opt(&opts); err != nil {
fmt.Printf("superstream: error initializing Wrong option: %s", err.Error())
return &newConfig
}
}
}
var clientType string
if _, ok := config.(*sarama.Config); ok {
clientType = "kafka"
}
conf := ConfigHandler(clientType, config.(*sarama.Config))
newClient := &Client{Config: conf}
if BrokerConnection == nil {
err := InitializeNatsConnection(token, host)
if err != nil {
fmt.Println("superstream: ", err.Error())
return &newConfig
}
}
newClient.LearningFactor = opts.LearningFactor
newClient.Config.Servers = opts.Servers
newClient.Config.ConsumerGroupId = opts.ConsumerGroup
err := newClient.RegisterClient()
if err != nil {
fmt.Println("superstream: ", err.Error())
return &newConfig
}
Clients[newClient.ClientID] = newClient
err = newClient.SubscribeUpdates()
if err != nil {
fmt.Println("superstream: ", err.Error())
return &newConfig
}
go newClient.reportClientsUpdate()
startInterceptors(&newConfig, newClient)
return &newConfig
}
func Close() {
BrokerConnection.Close()
}
func ConsumerGroup(consumerGroup string) Option {
return func(o *Options) error {
o.ConsumerGroup = consumerGroup
return nil
}
}
func Servers(servers []string) Option {
return func(o *Options) error {
o.Servers = strings.Join(servers, ",")
return nil
}
}
func LearningFactor(learningFactor int) Option {
return func(o *Options) error {
if learningFactor >= 0 && learningFactor <= 10000 {
o.LearningFactor = learningFactor
return nil
} else {
return fmt.Errorf("learning factor should be in range of 0 to 10000")
}
}
}
func GetDefaultOptions() Options {
return Options{
Host: "",
}
}
func InitializeNatsConnection(token, host string) error {
opts := []nats.Option{
nats.MaxReconnects(-1),
nats.Timeout(30 * time.Second),
nats.ReconnectWait(1 * time.Second),
nats.UserInfo(
superstreamInternalUsername,
token,
),
nats.ReconnectHandler(
func(nc *nats.Conn) {
var natsConnectionID string
for _, c := range Clients {
natsConnectionID, err := generateNatsConnectionID()
if err != nil {
c.handleError(fmt.Sprintf("InitializeNatsConnection at generateNatsConnectionID: %v", err.Error()))
return
}
clientReconnectionUpdateReq := ClientReconnectionUpdateReq{
NewNatsConnectionID: natsConnectionID,
ClientID: c.ClientID,
}
clientReconnectionUpdateReqBytes, err := json.Marshal(clientReconnectionUpdateReq)
if err != nil {
c.handleError(fmt.Sprintf("InitializeNatsConnection at Marshal %v", err.Error()))
return
}
_, err = nc.Request(clientReconnectionUpdateSubject, clientReconnectionUpdateReqBytes, 30*time.Second)
if err != nil {
c.handleError(fmt.Sprintf("InitializeNatsConnection at nc.Request %v", err.Error()))
return
}
}
NatsConnectionID = natsConnectionID
},
),
}
nc, err := nats.Connect(host, opts...)
if err != nil {
if strings.Contains(err.Error(), "nats: maximum account") {
return fmt.Errorf("can not connect with superstream since you have reached the maximum amount of connected clients")
} else if strings.Contains(err.Error(), "invalid checksum") {
return fmt.Errorf("error connecting with superstream: unauthorized")
} else {
return fmt.Errorf("error connecting with superstream: %v", err)
}
}
js, err := nc.JetStream()
if err != nil {
return fmt.Errorf("error connecting with superstream: %v", err)
}
BrokerConnection = nc
JSContext = js
natsConnectionID, err := generateNatsConnectionID()
if err != nil {
return fmt.Errorf("error connecting with superstream: %v", err)
}
NatsConnectionID = natsConnectionID
return nil
}
func (c *Client) RegisterClient() error {
registerReq := RegisterReq{
NatsConnectionID: NatsConnectionID,
Language: "go",
Version: sdkVersion,
LearningFactor: c.LearningFactor,
Config: c.Config,
}
registerReqBytes, err := json.Marshal(registerReq)
if err != nil {
return fmt.Errorf("error registering client: %v", err)
}
resp, err := BrokerConnection.Request(clientRegisterSubject, registerReqBytes, 30*time.Second)
if err != nil {
return fmt.Errorf("error registering client: %v", err)
}
var registerResp RegisterResp
err = json.Unmarshal(resp.Data, ®isterResp)
if err != nil {
return fmt.Errorf("error registering client: %v", err)
}
c.ClientID = registerResp.ClientID
c.AccountName = registerResp.AccountName
c.LearningFactor = registerResp.LearningFactor
c.LearningFactorCounter = 0
c.LearningRequestSent = false
c.GetSchemaRequestSent = false
c.ConsumerProtoDescMap = make(map[string]protoreflect.MessageDescriptor)
c.IsConsumer = false
c.IsProducer = false
c.Counters = ClientCounters{
TotalBytesBeforeReduction: 0,
TotalBytesAfterReduction: 0,
TotalMessagesSuccessfullyProduce: 0,
TotalMessagesSuccessfullyConsumed: 0,
TotalMessagesFailedProduce: 0,
TotalMessagesFailedConsume: 0,
}
return nil
}
func (c *Client) SubscribeUpdates() error {
cus := ClientUpdateSub{
ClientID: c.ClientID,
UpdateCahn: make(chan Update),
}
go cus.UpdatesHandler()
var err error
cus.Subscription, err = BrokerConnection.Subscribe(fmt.Sprintf(superstreamClientUpdatesSubject, c.ClientID), cus.SubscriptionHandler())
if err != nil {
return fmt.Errorf("error connecting with superstream %v", err)
}
return nil
}
func (c *ClientUpdateSub) UpdatesHandler() {
for {
msg := <-c.UpdateCahn
switch msg.Type {
case "LearnedSchema":
if client, ok := Clients[c.ClientID]; ok {
var schemaUpdateReq SchemaUpdateReq
err := json.Unmarshal(msg.Payload, &schemaUpdateReq)
if err != nil {
client.handleError(fmt.Sprintf("UpdatesHandler at json.Unmarshal: %v", err.Error()))
}
desc := client.compileMsgDescriptor(schemaUpdateReq.Desc, schemaUpdateReq.MasterMsgName, schemaUpdateReq.FileName)
if desc != nil {
client.ProducerProtoDesc = desc
client.ProducerSchemaID = schemaUpdateReq.SchemaID
} else {
client.handleError("UpdatesHandler: error compiling schema")
}
}
}
}
}
func (c *ClientUpdateSub) SubscriptionHandler() nats.MsgHandler {
return func(msg *nats.Msg) {
var update Update
err := json.Unmarshal(msg.Data, &update)
if err != nil {
Clients[c.ClientID].handleError(fmt.Sprintf("SubscriptionHandler at json.Unmarshal: %v", err.Error()))
}
c.UpdateCahn <- update
}
}
func (c *Client) SendLearningMessage(msg []byte) {
_, err := JSContext.Publish(fmt.Sprintf(superstreamLearningSubject, c.ClientID), msg)
if err != nil {
c.handleError(fmt.Sprintf("SendLearningMessage at Publish %v", err.Error()))
}
}
func (c *Client) SendRegisterSchemaReq() {
if c.LearningRequestSent {
return
}
_, err := JSContext.Publish(fmt.Sprintf(superstreamRegisterSchemaSubject, c.ClientID), []byte(""))
if err != nil {
c.handleError(fmt.Sprintf("SendRegisterSchemaReq at Publish %v", err.Error()))
} else {
c.LearningRequestSent = true
}
}
func (c *Client) compileMsgDescriptor(desc []byte, MasterMsgName, fileName string) protoreflect.MessageDescriptor {
descriptorSet := descriptorpb.FileDescriptorSet{}
err := proto.Unmarshal(desc, &descriptorSet)
if err != nil {
c.handleError(fmt.Sprintf("compileMsgDescriptor at proto.Unmarshal %v", err.Error()))
return nil
}
localRegistry, err := protodesc.NewFiles(&descriptorSet)
if err != nil {
c.handleError(fmt.Sprintf("compileMsgDescriptor at protodesc.NewFiles %v", err.Error()))
return nil
}
fileDesc, err := localRegistry.FindFileByPath(fileName)
if err != nil {
c.handleError(fmt.Sprintf("compileMsgDescriptor at FindFileByPath %v", err.Error()))
return nil
}
msgsDesc := fileDesc.Messages()
return msgsDesc.ByName(protoreflect.Name(MasterMsgName))
}
func (c *Client) SentGetSchemaRequest(schemaID string) error {
c.GetSchemaRequestSent = true
req := GetSchemaReq{
SchemaID: schemaID,
}
reqBytes, err := json.Marshal(req)
if err != nil {
c.handleError(fmt.Sprintf("compileMsgDescriptor at json.Marshal %v", err.Error()))
c.GetSchemaRequestSent = false
return err
}
msg, err := BrokerConnection.Request(fmt.Sprintf(superstreamGetSchemaSubject, c.ClientID), reqBytes, 30*time.Second)
if err != nil {
c.handleError(fmt.Sprintf("compileMsgDescriptor at Request %v", err.Error()))
c.GetSchemaRequestSent = false
return err
}
var resp SchemaUpdateReq
err = json.Unmarshal(msg.Data, &resp)
if err != nil {
c.handleError(fmt.Sprintf("compileMsgDescriptor at json.Unmarshal %v", err.Error()))
c.GetSchemaRequestSent = false
return err
}
desc := c.compileMsgDescriptor(resp.Desc, resp.MasterMsgName, resp.FileName)
if desc != nil {
c.ConsumerProtoDescMap[resp.SchemaID] = desc
} else {
c.handleError("compileMsgDescriptor: error compiling schema")
c.GetSchemaRequestSent = false
return fmt.Errorf("superstream: error compiling schema")
}
return nil
}
func (c *Client) SendClientTypeUpdateReq(clientType string) {
switch clientType {
case "consumer":
c.IsConsumer = true
case "producer":
c.IsProducer = true
}
clientTypeUpdateReq := ClientTypeUpdateReq{
ClientID: c.ClientID,
Type: clientType,
}
clientTypeUpdateReqBytes, err := json.Marshal(clientTypeUpdateReq)
if err != nil {
c.handleError(fmt.Sprintf("SendClientTypeUpdateReq at json.Marshal %v", err.Error()))
}
err = BrokerConnection.Publish(clientTypeUpdateSubject, clientTypeUpdateReqBytes)
if err != nil {
c.handleError(fmt.Sprintf("SendClientTypeUpdateReq at Publish %v", err.Error()))
}
}
func generateNatsConnectionID() (string, error) {
natsConnectionId, err := BrokerConnection.GetClientID()
if err != nil {
return "", err
}
serverName := BrokerConnection.ConnectedServerName()
return fmt.Sprintf("%v:%v", serverName, natsConnectionId), nil
}
func sendClientErrorsToBE(errMsg string) {
BrokerConnection.Publish(superstreamErrorSubject, []byte(errMsg))
}
func (c *Client) reportClientsUpdate() {
ticker := time.NewTicker(30 * time.Second)
for {
select {
case <-ticker.C:
byteCounters, err := json.Marshal(c.Counters)
if err != nil {
c.handleError(fmt.Sprintf("reportClientsUpdate at json.Marshal %v", err.Error()))
}
if c.Config.ConsumerTopicsPartitions == nil {
c.Config.ConsumerTopicsPartitions = map[string][]int32{}
}
topicPartitionConfig := TopicsPartitionsPerProducerConsumer{
ProducerTopicsPartitions: c.Config.ProducerTopicsPartitions,
ConsumerTopicsPartitions: c.Config.ConsumerTopicsPartitions,
}
byteConfig, err := json.Marshal(topicPartitionConfig)
if err != nil {
c.handleError(fmt.Sprintf("reportClientsUpdate at json.Marshal %v", err.Error()))
}
err = BrokerConnection.Publish(fmt.Sprintf(superstreamClientsUpdateSubject, "counters", c.ClientID), byteCounters)
if err != nil {
c.handleError(fmt.Sprintf("reportClientsUpdate at Publish %v to counters subject", err.Error()))
}
err = BrokerConnection.Publish(fmt.Sprintf(superstreamClientsUpdateSubject, "config", c.ClientID), byteConfig)
if err != nil {
c.handleError(fmt.Sprintf("reportClientsUpdate at Publish to config subject %v", err.Error()))
}
}
}
}