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worker.go
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worker.go
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package rmqworker
import (
"context"
"errors"
"time"
"github.com/beefsack/go-rate"
"github.com/google/uuid"
"github.com/matrixbotio/constants-lib"
darkmq "github.com/sagleft/darkrmq"
"github.com/streadway/amqp"
"go.uber.org/zap"
"github.com/matrixbotio/rmqworker-lib/pkg/errs"
)
/*
__.-/|
\`o_O' +---------------------------+
=( )= | RMQ Worker |
U| | I accept msgs from queues |
/\ /\ / | +---------------------------+
) /^\) ^\/ _)\ |
) /^\/ _) \ |
) _ / / _) \___|_
/\ )/\/ || | )_)\___,|))
< > |(,,) )__) |
|| / \)___)\
| \____( )___) )____
\______(_______;;;)__;;;)
*/
// NewRMQWorker - create new RMQ worker to receive messages
func (r *RMQHandler) NewRMQWorker(task WorkerTask) (*RMQWorker, errs.APIError) {
// set worker name
if task.WorkerName == "" {
task.WorkerName = "RMQ-W"
}
if task.ConsumersCount == 0 {
task.ConsumersCount = 1
}
// create worker
w := RMQWorker{
data: rmqWorkerData{
Name: task.WorkerName,
CheckResponseErrors: !task.DisableCheckResponseErrors,
ID: task.ID,
},
conn: r.conn,
rmqConsumer: &consumer{ // consumer
Tag: task.WorkerName + "-" + uuid.NewString(),
ManualAck: task.ManualAck,
QueueData: DeclareQueueTask{
Name: task.QueueName,
Durable: task.ISQueueDurable,
AutoDelete: task.ISAutoDelete,
MessagesLifetime: task.MessagesLifetime,
MaxLength: task.QueueLength,
DisableOverflow: task.DisableOverflow,
},
Binding: exchandeBindData{
ExchangeName: task.FromExchange,
ExchangeType: task.ExchangeType,
RoutingKey: task.RoutingKey,
},
},
channels: rmqWorkerChannels{
RMQMessages: make(<-chan amqp.Delivery),
OnFinished: make(chan struct{}, 1),
StopCh: make(chan struct{}, 1),
},
consumersCount: task.ConsumersCount,
deliveryCallback: task.Callback,
timeoutCallback: task.TimeoutCallback,
Logger: r.task.Logger,
}
// setup error handler
w.rmqConsumer.errorCallback = w.handleError
if task.UseErrorCallback {
w.useErrorCallback = true
w.errorCallback = task.ErrorCallback
}
// setup messages handler
w.rmqConsumer.msgHandler = w.handleRMQMessage
w.remakeStopChannel()
if task.EnableRateLimiter && task.MaxEventsPerSecond > 0 {
w.rateLimiter = rate.New(task.MaxEventsPerSecond, time.Second)
}
return &w, nil
}
func (w *RMQWorker) logVerbose(message string) {
w.Logger.Debug(message, zap.String("worker_name", w.data.Name))
}
// SetName - set RMQ worker name for logs
func (w *RMQWorker) SetName(name string) *RMQWorker {
w.data.Name = name
return w
}
// GetName - get worker name
func (w *RMQWorker) GetName() string {
return w.data.Name
}
// SetID - set RMQ worker ID
func (w *RMQWorker) SetID(id string) *RMQWorker {
w.data.ID = id
return w
}
// GetID - get worker ID
func (w *RMQWorker) GetID() string {
return w.data.ID
}
// SetCheckResponseErrors - determines whether the errors in the answers passed to headers will be checked
func (w *RMQWorker) SetCheckResponseErrors(check bool) *RMQWorker {
w.data.CheckResponseErrors = check
return w
}
// Serve - start consumer(s)
func (w *RMQWorker) Serve() errs.APIError {
err := w.conn.StartMultipleConsumers(darkmq.StartConsumersTask{
Ctx: context.Background(),
Consumer: w.rmqConsumer,
Count: w.consumersCount,
Stop: w.stopCh,
})
if err != nil {
return constants.Error(
"SERVICE_REQ_FAILED",
"failed to start consumer(s): "+err.Error(),
)
}
return nil
}
// Stop RMQ messages listen
func (w *RMQWorker) Stop() {
if len(w.stopCh) == 0 {
w.stopCh <- struct{}{}
}
w.Finish()
w.logVerbose("worker stopped")
}
// Finish worker but continue listen messages
func (w *RMQWorker) Finish() {
if len(w.channels.OnFinished) == 0 {
w.channels.OnFinished <- struct{}{}
}
}
// Reset worker channels
func (w *RMQWorker) Reset() {
w.channels.OnFinished = make(chan struct{}, 1)
w.channels.StopCh = make(chan struct{}, 1)
}
func (w *RMQWorker) remakeStopChannel() {
w.stopCh = make(chan struct{}, 1)
}
// SetConsumerTag - set worker unique consumer tag
func (w *RMQWorker) SetConsumerTag(uniqueTag string) *RMQWorker {
w.rmqConsumer.Tag = uniqueTag
return w
}
// SetConsumerTagFromName - assign a consumer tag to the worker based on its name and random ID
func (w *RMQWorker) SetConsumerTagFromName() *RMQWorker {
tag := w.data.Name + "-" + uuid.NewString()
if w.data.Name == "" {
tag = "worker" + w.rmqConsumer.Tag
}
return w.SetConsumerTag(tag)
}
func (w *RMQWorker) handleError(err *constants.APIError) {
if !w.useErrorCallback {
w.Logger.Error("handleError", zap.Error(errors.New(err.Message)))
return
}
w.errorCallback(w, err)
}
func (w *RMQWorker) handleRMQMessage(delivery RMQDeliveryHandler) {
w.logVerbose("new rmq message found")
// check response error
if w.data.CheckResponseErrors {
w.logVerbose("check message errors")
aErr := delivery.CheckResponseError()
if aErr != nil {
w.handleError(aErr)
return
}
}
// callback
w.logVerbose("run callback..")
if w.deliveryCallback == nil {
w.handleError(constants.Error("DATA_HANDLE_ERR", "rmq worker message callback is nil"))
return
}
// run callback
w.deliveryCallback(w, delivery)
}
// AwaitFinish - wait for worker finished
func (w *RMQWorker) AwaitFinish() {
<-w.channels.OnFinished
}