/
worker.go
171 lines (146 loc) · 4.83 KB
/
worker.go
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package worker
import (
"context"
"fmt"
"github.com/aws/aws-sdk-go-v2/service/sqs"
"github.com/aws/aws-sdk-go-v2/service/sqs/types"
"sync"
)
type ResponseStatus string
const (
KeepMessage ResponseStatus = "KeepMessage"
DeleteMessage ResponseStatus = "DeleteMessage"
ChangeMessageVisibility ResponseStatus = "ChangeMessageVisibility"
)
type HandlerFuncResponse struct {
Status ResponseStatus
VisibilityTimeout *int32
}
// HandlerFunc is used to define the Handler that is run on for each message
type HandlerFunc func(msg types.Message) HandlerFuncResponse
type SqsConsumeApi interface {
GetQueueUrl(ctx context.Context,
params *sqs.GetQueueUrlInput,
optFns ...func(*sqs.Options)) (*sqs.GetQueueUrlOutput, error)
ReceiveMessage(ctx context.Context,
params *sqs.ReceiveMessageInput,
optFns ...func(*sqs.Options)) (*sqs.ReceiveMessageOutput, error)
DeleteMessage(ctx context.Context,
params *sqs.DeleteMessageInput,
optFns ...func(*sqs.Options)) (*sqs.DeleteMessageOutput, error)
ChangeMessageVisibility(ctx context.Context,
params *sqs.ChangeMessageVisibilityInput,
optFns ...func(*sqs.Options)) (*sqs.ChangeMessageVisibilityOutput, error)
}
// Worker struct
type Worker struct {
Config *Config
Log LoggerIFace
SqsClient SqsConsumeApi
}
// Config struct
type Config struct {
MaxNumberOfMessage int32
QueueName *string
QueueURL *string
WaitTimeSecond int32
}
// New sets up a new Worker
func New(client SqsConsumeApi, config *Config, logger LoggerIFace) *Worker {
config.populateDefaultValues()
if config.QueueURL == nil {
queueURL, err := getQueueURL(client, config.QueueName)
if err != nil {
panic(err)
}
config.QueueURL = queueURL
}
return &Worker{
Config: config,
Log: logger,
SqsClient: client,
}
}
// Start starts the polling and will continue polling till the application is forcibly stopped
func (worker *Worker) Start(ctx context.Context, fn HandlerFunc) {
worker.Log.Info("sqs worker: starting polling")
for {
select {
case <-ctx.Done():
worker.Log.Info("sqs worker: stopping polling because a context kill signal was sent")
return
default:
params := &sqs.ReceiveMessageInput{
QueueUrl: worker.Config.QueueURL, // Required
MaxNumberOfMessages: worker.Config.MaxNumberOfMessage,
AttributeNames: []types.QueueAttributeName{
types.QueueAttributeNameAll, // Required
},
MessageAttributeNames: []string{
string(types.QueueAttributeNameAll),
},
WaitTimeSeconds: worker.Config.WaitTimeSecond,
}
resp, err := worker.SqsClient.ReceiveMessage(ctx, params)
if err != nil {
worker.Log.Error(fmt.Sprintf("sqs worker: receive message error: %s", err.Error()))
continue
}
if len(resp.Messages) > 0 {
worker.run(ctx, fn, resp.Messages)
}
}
}
}
// poll launches goroutine per received message and wait for all message to be processed
func (worker *Worker) run(ctx context.Context, fn HandlerFunc, messages []types.Message) {
numMessages := len(messages)
worker.Log.Debug(fmt.Sprintf("sqs worker: received %d messages", numMessages))
var wg sync.WaitGroup
wg.Add(numMessages)
for i := range messages {
go func(m types.Message) {
// launch goroutine
defer wg.Done()
worker.handleMessage(ctx, m, fn)
}(messages[i])
}
wg.Wait()
}
func (worker *Worker) handleMessage(ctx context.Context, m types.Message, fn HandlerFunc) {
switch resp := fn(m); resp.Status {
case DeleteMessage:
worker.deleteMessage(ctx, m)
case ChangeMessageVisibility:
worker.changeMessageVisibility(ctx, m, *resp.VisibilityTimeout)
case KeepMessage:
worker.Log.Debug(fmt.Sprintf("sqs worker: keep message in queue: %s", *m.MessageId))
default:
worker.Log.Error(fmt.Sprintf("sqs worker: unknown handler function response status: %s", resp.Status))
}
}
func (worker *Worker) changeMessageVisibility(ctx context.Context, m types.Message, visibility int32) {
params := &sqs.ChangeMessageVisibilityInput{
QueueUrl: worker.Config.QueueURL,
ReceiptHandle: m.ReceiptHandle,
VisibilityTimeout: visibility,
}
_, err := worker.SqsClient.ChangeMessageVisibility(ctx, params)
if err != nil {
worker.Log.Error(fmt.Sprintf("sqs worker: message id %s change visibility error: %s", *m.MessageId, err.Error()))
return
}
worker.Log.Debug(fmt.Sprintf("sqs worker: changed message visibility: %s", *m.ReceiptHandle))
}
func (worker *Worker) deleteMessage(ctx context.Context, m types.Message) {
params := &sqs.DeleteMessageInput{
QueueUrl: worker.Config.QueueURL,
ReceiptHandle: m.ReceiptHandle,
}
_, err := worker.SqsClient.DeleteMessage(ctx, params)
if err != nil {
worker.Log.Error(fmt.Sprintf("sqs worker: message id %s delete error: %s", *m.MessageId, err.Error()))
return
}
worker.Log.Debug(fmt.Sprintf("sqs worker: deleted message from queue: %s", *m.ReceiptHandle))
}