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handler.go
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handler.go
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package kafka
import (
"context"
"errors"
"fmt"
"sync"
"time"
"github.com/IBM/sarama"
"github.com/spf13/viper"
"go.uber.org/zap"
)
type Handler struct {
topics []string
group sarama.ConsumerGroup
wg *sync.WaitGroup
ctx context.Context
cancel context.CancelFunc
handle Handle
logger *zap.Logger
}
type Handle func(msg *sarama.ConsumerMessage)
func NewHandler(ctx context.Context, group sarama.ConsumerGroup, topics []string) (
handler *Handler) {
handler = &Handler{
topics: topics,
group: group,
wg: new(sync.WaitGroup),
}
handler.ctx, handler.cancel = context.WithCancel(ctx)
return handler
}
func HandlerFromConfig(ctx context.Context, vp *viper.Viper, field string) (
handler *Handler, err error) {
var (
config *Config
scfg *sarama.Config
group sarama.ConsumerGroup
)
if config, scfg, err = NewConfigFromViper(vp, field); err != nil {
return nil, err
}
if group, err = sarama.NewConsumerGroup(config.Addrs, config.GroupId, scfg); err != nil {
return nil, err
}
handler = NewHandler(ctx, group, []string{config.Topic})
// alter handler.Logger later
return handler, nil
}
func (handler *Handler) WithHandle(handle Handle) *Handler {
handler.handle = handle
return handler
}
func (handler *Handler) WithLogger(logger *zap.Logger) *Handler {
handler.logger = logger
return handler
}
func (handler *Handler) Ok() (err error) {
if handler.handle == nil {
return fmt.Errorf("hanlder is unset")
}
if handler.logger == nil {
return fmt.Errorf("logger is unset")
}
return nil
}
func (handler *Handler) Consume() {
go handler.consume()
}
// maxRetries: 5, wait: 3 * time.Second
func (handler *Handler) consume() {
var (
err error
n int
maxRetries int
wait time.Duration
)
n, maxRetries = 0, 5
wait = 3 * time.Second
handler.logger.Info("Consume start")
for {
err = handler.group.Consume(handler.ctx, handler.topics, handler)
if err != nil {
if errors.Is(sarama.ErrClosedConsumerGroup, err) {
handler.logger.Warn(fmt.Sprintf("Consume closed: %v", err))
return
}
handler.logger.Error(fmt.Sprintf("Consume error: %v", err))
} else {
handler.logger.Info("Consume end") // occurs when reset offset
}
if n++; n > maxRetries {
handler.logger.Warn(
fmt.Sprintf("Consume exceeds max retries limit: %d", maxRetries),
)
return
}
// if err = handler.ctx.Err(); err != nil {
// handler.logger.Error("!!! Handler.Consume ctx.Err(): %v", err)
// return
// }
select {
case <-handler.ctx.Done():
return
default:
}
time.Sleep(wait)
}
}
func (handler *Handler) Close() error {
handler.cancel()
handler.wg.Wait()
return handler.group.Close()
}
func (handler *Handler) Setup(sess sarama.ConsumerGroupSession) (err error) {
handler.logger.Info("Setup run")
go func() {
var err error
for {
select {
case err = <-handler.group.Errors():
if errors.Is(sarama.ErrClosedConsumerGroup, err) {
handler.logger.Warn("Setup closed")
return
}
handler.logger.Error(fmt.Sprintf("Setup error: %v", err))
case <-handler.ctx.Done():
handler.logger.Info("Setup done")
return
}
}
}()
return nil
}
func (handler *Handler) Cleanup(sess sarama.ConsumerGroupSession) (err error) {
// TODO
handler.logger.Info("Cleanup run")
return nil
}
func (handler *Handler) ConsumeClaim(sess sarama.ConsumerGroupSession,
claim sarama.ConsumerGroupClaim) error {
handler.wg.Add(1)
defer handler.wg.Done()
for {
select {
case msg := <-claim.Messages():
if msg == nil {
return nil
}
handler.handle(msg)
// sess.MarkOffset(msg.Topic, msg.Partition, msg.Offset, "some-metadata")
sess.MarkMessage(msg, "consumed")
case <-handler.ctx.Done():
handler.logger.Warn("ConsumeClaim canceled")
return nil
}
}
}