/
sqs.go
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/
sqs.go
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package sqs
import (
"context"
"reflect"
"strconv"
"sync"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/config"
"github.com/aws/aws-sdk-go-v2/service/sqs"
sqstypes "github.com/aws/aws-sdk-go-v2/service/sqs/types"
awsutils "github.com/berachain/offchain-sdk/types/aws"
"github.com/berachain/offchain-sdk/types/queue/types"
)
// awsMaxBatchSize is the max batch size for AWS.
const awsMaxBatchSize = 10
// SQSClient is an interface that defines the necessary methods for interacting
// with the SQS service.
type Client interface {
SendMessage(ctx context.Context,
params *sqs.SendMessageInput, optFns ...func(*sqs.Options)) (*sqs.SendMessageOutput, 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)
GetQueueAttributes(ctx context.Context, params *sqs.GetQueueAttributesInput,
optFns ...func(*sqs.Options)) (*sqs.GetQueueAttributesOutput, error)
}
// Queue is a wrapper struct around the SQS API.
type Queue[T types.Marshallable] struct {
svc Client
queueURL string
inProcessMu *sync.RWMutex
inProcess map[string]string
}
// NewQueueFromAWSConfig creates a new SQS object with the specified AWS config & queue URL.
func NewQueueFromAWSConfig[T types.Marshallable](
cfg aws.Config, queueURL string,
) (*Queue[T], error) {
return &Queue[T]{
svc: sqs.NewFromConfig(cfg),
queueURL: queueURL,
inProcessMu: new(sync.RWMutex),
inProcess: make(map[string]string),
}, nil
}
// NewQueueFromConfig creates a new SQS object with the specified config & queue URL.
func NewQueueFromConfig[T types.Marshallable](cfg Config) (*Queue[T], error) {
awsCfg, _ := config.LoadDefaultConfig(
context.Background(), func(acfg *config.LoadOptions) error {
// Set the AWS region.
acfg.Region = cfg.Region
// Set the AWS credentials.
acfg.Credentials = awsutils.NewCredentialsProvider(cfg.AccessKeyID, cfg.SecretKey)
// Return nil since no error occurred.
return nil
})
return NewQueueFromAWSConfig[T](awsCfg, cfg.QueueURL)
}
// Push adds an item to the SQS queue.
func (q *Queue[T]) Push(item T) (string, error) {
// Marshal the item
bz, err := item.Marshal()
if err != nil {
return "", err
}
// Send the message to the SQS queue with the provided context
str := string(bz)
output, err := q.svc.SendMessage(context.TODO(), &sqs.SendMessageInput{
QueueUrl: &q.queueURL,
MessageBody: &str,
})
if err != nil || output == nil || output.MessageId == nil {
return "", err
}
return *output.MessageId, nil
}
// Pop retrieves an item from the SQS queue.
func (q *Queue[T]) Receive() (string, T, bool) {
var t2 T
t1 := reflect.TypeOf(t2).Elem()
newInstance := reflect.New(t1).Interface()
t, _ := newInstance.(T)
// Receive a message from the SQS queue
resp, err := q.svc.ReceiveMessage(context.TODO(), &sqs.ReceiveMessageInput{
QueueUrl: &q.queueURL,
MaxNumberOfMessages: 1,
})
if err != nil {
return "", t, false
}
// Check if a message was received
if len(resp.Messages) == 0 {
return "", t, false
}
// Unmarshal the message into a new instance of type T
if err = t.Unmarshal([]byte(*resp.Messages[0].Body)); err != nil {
return "", t, false
}
// Add to the inProcess MessageID queue, mark the Message as in Process.
// TODO memory growth atm.
q.inProcess[*resp.Messages[0].MessageId] = *resp.Messages[0].ReceiptHandle
return *resp.Messages[0].MessageId, t, true
}
func (q *Queue[T]) ReceiveMany(num int32) ([]string, []T, error) {
if num > awsMaxBatchSize {
num = awsMaxBatchSize
}
// Receive a message from the SQS queue
resp, err := q.svc.ReceiveMessage(context.TODO(), &sqs.ReceiveMessageInput{
QueueUrl: &q.queueURL,
MaxNumberOfMessages: num,
})
if err != nil {
return nil, nil, err
}
// Check if a message was received
if len(resp.Messages) == 0 {
return nil, nil, err
}
msgIDs := make([]string, len(resp.Messages))
ts := make([]T, len(resp.Messages))
for i, m := range resp.Messages {
var t2 T
t1 := reflect.TypeOf(t2).Elem()
newInstance := reflect.New(t1).Interface()
t, _ := newInstance.(T)
// Unmarshal the message into a new instance of type T
if err = t.Unmarshal([]byte(*m.Body)); err != nil {
return nil, nil, err
}
// Add to the inProcess MessageID queue, mark the Message as in Process.
// TODO memory growth atm.
q.inProcessMu.Lock()
q.inProcess[*m.MessageId] = *m.ReceiptHandle
q.inProcessMu.Unlock()
msgIDs[i] = *m.MessageId
ts[i] = t
}
return msgIDs, ts, nil
}
func (q *Queue[T]) Len() int {
// Delete from the queue to mark as complete.
resp, err := q.svc.GetQueueAttributes(context.TODO(), &sqs.GetQueueAttributesInput{
QueueUrl: &q.queueURL,
AttributeNames: []sqstypes.QueueAttributeName{
"ApproximateNumberOfMessages",
},
})
if err != nil {
return 0
}
anm := resp.Attributes["ApproximateNumberOfMessages"]
val, _ := strconv.ParseInt(anm, 10, 64)
return int(val)
}
func (q *Queue[T]) Delete(messageID string) error {
return q.deleteMessage(messageID)
}
func (q *Queue[T]) deleteMessage(messageID string) error {
// Grab the latest receipt handle by the messageID.
q.inProcessMu.RLock()
receiptHandle := q.inProcess[messageID]
q.inProcessMu.RUnlock()
// Delete from the queue to mark as complete.
_, err := q.svc.DeleteMessage(context.TODO(), &sqs.DeleteMessageInput{
QueueUrl: &q.queueURL,
ReceiptHandle: &receiptHandle,
})
if err != nil {
return err
}
// remove the messageID from the inProcess map.
q.inProcessMu.Lock()
defer q.inProcessMu.Unlock()
delete(q.inProcess, messageID)
return nil
}