/
service.go
163 lines (150 loc) · 4.13 KB
/
service.go
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package kafka
import (
"fmt"
"github.com/aacfactory/errors"
"github.com/aacfactory/fns-contrib/message-queues/kafka/configs"
"github.com/aacfactory/fns/context"
"github.com/aacfactory/fns/services"
"time"
)
var (
endpointName = []byte("kafka")
)
type Options struct {
consumeHandlers map[string]ConsumeHandler
consumeErrHandler ConsumeErrorHandler
}
type Option func(options *Options)
func WithConsumeHandler(name string, handler ConsumeHandler) Option {
return func(options *Options) {
options.consumeHandlers[name] = handler
}
}
func WithConsumeErrorHandler(handler ConsumeErrorHandler) Option {
return func(options *Options) {
options.consumeErrHandler = handler
}
}
func New(options ...Option) services.Listenable {
opt := Options{
consumeHandlers: make(map[string]ConsumeHandler),
}
for _, option := range options {
option(&opt)
}
return &service{
Abstract: services.NewAbstract(string(endpointName), true),
consumeHandlers: opt.consumeHandlers,
consumeErrHandler: opt.consumeErrHandler,
producer: nil,
consumers: make(map[string]Consumer),
}
}
type service struct {
services.Abstract
consumeHandlers map[string]ConsumeHandler
consumeErrHandler ConsumeErrorHandler
producer *Producer
consumers map[string]Consumer
}
func (svc *service) Construct(options services.Options) (err error) {
err = svc.Abstract.Construct(options)
if err != nil {
err = errors.Warning("kafka: construct failed").WithCause(err)
return
}
config := configs.Config{}
configErr := options.Config.As(&config)
if configErr != nil {
err = errors.Warning("kafka: construct failed").WithCause(configErr)
return
}
opts, optsErr := config.Options(options.Id, options.Version, svc.Log())
if optsErr != nil {
err = errors.Warning("kafka: construct failed").WithCause(optsErr)
return
}
if config.Producers.Enable {
producerOpts, producerOptsErr := config.Producers.Options()
if producerOptsErr != nil {
err = errors.Warning("kafka: construct failed").WithCause(producerOptsErr)
return
}
producerOpts = append(opts, producerOpts...)
svc.producer, err = NewProducer(svc.Log().With("component", "producer"), config.Producers.Num, producerOpts)
if err != nil {
err = errors.Warning("kafka: construct failed").WithCause(err)
return
}
}
if config.Consumers != nil {
for name, consumerConfig := range config.Consumers {
handler, has := svc.consumeHandlers[name]
if !has {
err = errors.Warning("kafka: construct failed").WithCause(fmt.Errorf("%s consumer hander is not found", name))
return
}
consumerOpts, consumerOptsErr := consumerConfig.Options()
if consumerOptsErr != nil {
err = errors.Warning("kafka: construct failed").WithCause(consumerOptsErr)
return
}
consumerOpts = append(opts, consumerOpts...)
consumerLog := svc.Log().With("component", "consumer").With("consumer", name)
consumer, consumerErr := NewGroupConsumer(consumerLog, consumerConfig.MaxPollRecords, consumerConfig.PartitionBuffer, consumerOpts, handler, svc.consumeErrHandler)
if consumerErr != nil {
err = errors.Warning("kafka: construct failed").WithCause(consumerErr).WithMeta("consumer", name)
return
}
svc.consumers[name] = consumer
}
}
svc.addFns()
return
}
func (svc *service) Listen(ctx context.Context) (err error) {
if svc.consumers == nil || len(svc.consumers) == 0 {
return
}
for _, consumer := range svc.consumers {
errCn := make(chan error, 1)
go func(ctx context.Context, consumer Consumer, errCh chan error) {
lnErr := consumer.Listen(ctx)
if lnErr != nil {
errCn <- lnErr
}
}(ctx, consumer, errCn)
select {
case <-ctx.Done():
break
case err = <-errCn:
break
case <-time.After(3 * time.Second):
break
}
if err != nil {
break
}
}
if err != nil {
svc.Shutdown(ctx)
}
return
}
func (svc *service) Shutdown(ctx context.Context) {
if svc.producer != nil {
svc.producer.Shutdown(ctx)
}
if svc.consumers != nil {
for _, consumer := range svc.consumers {
consumer.Shutdown(ctx)
}
return
}
return
}
func (svc *service) addFns() {
svc.AddFunction(&publishFn{
producer: svc.producer,
})
}