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adapter.go
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adapter.go
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/*
Copyright 2020 The Knative Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package rabbitmq
import (
"context"
"fmt"
nethttp "net/http"
"sync"
"go.uber.org/zap"
amqp "github.com/rabbitmq/amqp091-go"
"knative.dev/eventing-rabbitmq/pkg/rabbit"
"knative.dev/eventing-rabbitmq/pkg/utils"
"knative.dev/eventing/pkg/adapter/v2"
v1 "knative.dev/eventing/pkg/apis/duck/v1"
"knative.dev/eventing/pkg/kncloudevents"
"knative.dev/eventing/pkg/metrics/source"
"knative.dev/pkg/logging"
)
const resourceGroup = "rabbitmqsources.sources.knative.dev"
type adapterConfig struct {
adapter.EnvConfig
RabbitURL string `envconfig:"RABBIT_URL" required:"true"`
Vhost string `envconfig:"RABBITMQ_VHOST" required:"false"`
Predeclared bool `envconfig:"RABBITMQ_PREDECLARED" required:"false"`
Retry int `envconfig:"HTTP_SENDER_RETRY" required:"false"`
BackoffPolicy string `envconfig:"HTTP_SENDER_BACKOFF_POLICY" required:"false"`
BackoffDelay string `envconfig:"HTTP_SENDER_BACKOFF_DELAY" default:"PT0.2S" required:"false"`
Parallelism int `envconfig:"RABBITMQ_CHANNEL_PARALLELISM" default:"1" required:"false"`
ExchangeName string `envconfig:"RABBITMQ_EXCHANGE_NAME" required:"false"`
QueueName string `envconfig:"RABBITMQ_QUEUE_NAME" required:"true"`
}
func NewEnvConfig() adapter.EnvConfigAccessor {
return &adapterConfig{}
}
type Adapter struct {
config *adapterConfig
httpMessageSender *kncloudevents.HTTPMessageSender
reporter source.StatsReporter
logger *zap.Logger
context context.Context
rmqHelper rabbit.RabbitMQHelperInterface
connection rabbit.RabbitMQConnectionInterface
channel rabbit.RabbitMQChannelInterface
}
var _ adapter.MessageAdapter = (*Adapter)(nil)
var _ adapter.MessageAdapterConstructor = NewAdapter
var (
retryConfig *kncloudevents.RetryConfig
retriesInt32 int32 = 0
)
func NewAdapter(ctx context.Context, processed adapter.EnvConfigAccessor, httpMessageSender *kncloudevents.HTTPMessageSender, reporter source.StatsReporter) adapter.MessageAdapter {
logger := logging.FromContext(ctx).Desugar()
config := processed.(*adapterConfig)
return &Adapter{
config: config,
httpMessageSender: httpMessageSender,
reporter: reporter,
logger: logger,
context: ctx,
}
}
func (a *Adapter) Start(ctx context.Context) error {
return a.start(ctx.Done())
}
func (a *Adapter) start(stopCh <-chan struct{}) error {
logger := a.logger.Sugar()
logger.Info("Starting with config: ",
zap.String("Name", a.config.Name),
zap.String("Namespace", a.config.Namespace),
zap.String("QueueName", a.config.QueueName),
zap.String("SinkURI", a.config.Sink))
if a.rmqHelper == nil {
a.rmqHelper = rabbit.NewRabbitMQHelper(1, make(chan bool), rabbit.DialWrapper)
}
return a.PollForMessages(stopCh)
}
func (a *Adapter) ConsumeMessages(queue *amqp.Queue, logger *zap.SugaredLogger) (<-chan amqp.Delivery, error) {
msgs, err := a.channel.Consume(
queue.Name,
"",
false,
false,
false,
false,
amqp.Table{})
if err != nil {
logger.Error(err.Error())
}
return msgs, err
}
func (a *Adapter) PollForMessages(stopCh <-chan struct{}) error {
logger := a.logger.Sugar()
var err error
var queue amqp.Queue
var msgs <-chan (amqp.Delivery)
auxRetryConfig := kncloudevents.NoRetries()
if a.config.BackoffDelay != "" {
retriesInt32 = int32(a.config.Retry)
backoffPolicy := utils.SetBackoffPolicy(a.context, a.config.BackoffPolicy)
if backoffPolicy == "" {
a.logger.Sugar().Fatalf("Invalid BACKOFF_POLICY specified: must be %q or %q", v1.BackoffPolicyExponential, v1.BackoffPolicyLinear)
}
auxRetryConfig, err = kncloudevents.RetryConfigFromDeliverySpec(v1.DeliverySpec{
BackoffPolicy: &backoffPolicy,
BackoffDelay: &a.config.BackoffDelay,
Retry: &retriesInt32,
})
if err != nil {
a.logger.Error("error retrieving retryConfig from deliverySpec", zap.Error(err))
}
}
retryConfig = &auxRetryConfig
wg := &sync.WaitGroup{}
workerCount := a.config.Parallelism
wg.Add(workerCount)
workerQueue := make(chan amqp.Delivery, workerCount)
logger.Info("Starting GoRoutines Workers: ", zap.Int("WorkerCount", workerCount))
for i := 0; i < workerCount; i++ {
go a.processMessages(wg, workerQueue)
}
retryChan := make(chan bool)
defer a.rmqHelper.CleanupRabbitMQ(a.connection, logger)
for {
a.connection, a.channel, err = a.rmqHelper.SetupRabbitMQ(rabbit.VHostHandler(a.config.RabbitURL, a.config.Vhost), rabbit.ChannelQoS, logger)
if err != nil {
logger.Errorf("error creating RabbitMQ connections: %s, waiting for a retry", err)
} else {
queue, err = a.channel.QueueInspect(a.config.QueueName)
if err != nil {
logger.Error(err.Error())
continue
}
msgs, _ = a.ConsumeMessages(&queue, logger)
go PollCycle(retryChan, stopCh, workerQueue, wg, msgs, a.rmqHelper, logger)
}
if retry := a.rmqHelper.WaitForRetrySignal(); !retry {
logger.Warn("stopped listenning for RabbitMQ resources retries")
return nil
}
if err != nil {
retryChan <- true
}
logger.Warn("recreating RabbitMQ resources")
}
}
func PollCycle(
retryChan chan bool,
stopCh <-chan struct{},
workerQueue chan amqp.Delivery,
wg *sync.WaitGroup,
msgs <-chan amqp.Delivery,
rmqHelper rabbit.RabbitMQHelperInterface,
logger *zap.SugaredLogger) {
for {
select {
case <-stopCh:
close(workerQueue)
wg.Wait()
logger.Info("Shutting down...")
rmqHelper.SignalRetry(false)
return
case msg, ok := <-msgs:
if !ok {
return
}
workerQueue <- msg
case <-retryChan:
return
}
}
}
func (a *Adapter) processMessages(wg *sync.WaitGroup, queue <-chan amqp.Delivery) {
defer wg.Done()
for msg := range queue {
a.logger.Info("Received: ", zap.String("MessageId", msg.MessageId))
if err := a.postMessage(&msg); err == nil {
a.logger.Info("Successfully sent event to sink")
err = msg.Ack(false)
if err != nil {
a.logger.Error("sending Ack failed with Delivery Tag")
}
} else {
a.logger.Error("sending event to sink failed: ", zap.Error(err))
err = msg.Nack(false, false)
if err != nil {
a.logger.Error("sending Nack failed with Delivery Tag")
}
}
}
}
func (a *Adapter) postMessage(msg *amqp.Delivery) error {
a.logger.Info("target: " + a.httpMessageSender.Target)
req, err := a.httpMessageSender.NewCloudEventRequest(a.context)
if err != nil {
return err
}
err = rabbit.ConvertMessageToHTTPRequest(
a.context,
a.config.Name,
a.config.Namespace,
a.config.QueueName,
msg,
req,
a.logger)
if err != nil {
a.logger.Error("error writing event to http", zap.Error(err))
return err
}
res, err := a.httpMessageSender.SendWithRetries(req, retryConfig)
if err != nil {
a.logger.Error("error while sending the message", zap.Error(err))
return err
}
if res.StatusCode/100 != 2 {
a.logger.Error("unexpected status code", zap.Int("status code", res.StatusCode))
return fmt.Errorf("%d %s", res.StatusCode, nethttp.StatusText(res.StatusCode))
}
reportArgs := &source.ReportArgs{
Namespace: a.config.Namespace,
Name: a.config.Name,
ResourceGroup: resourceGroup,
}
_ = a.reporter.ReportEventCount(reportArgs, res.StatusCode)
return nil
}