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amazon_sqs.go
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amazon_sqs.go
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// Copyright (c) 2018 Ashley Jeffs
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package reader
import (
"time"
"github.com/Jeffail/benthos/lib/log"
"github.com/Jeffail/benthos/lib/message"
"github.com/Jeffail/benthos/lib/metrics"
"github.com/Jeffail/benthos/lib/types"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/credentials/stscreds"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/sqs"
)
//------------------------------------------------------------------------------
// AmazonSQSConfig contains configuration values for the input type.
type AmazonSQSConfig struct {
Region string `json:"region" yaml:"region"`
URL string `json:"url" yaml:"url"`
Credentials AmazonAWSCredentialsConfig `json:"credentials" yaml:"credentials"`
TimeoutS int64 `json:"timeout_s" yaml:"timeout_s"`
}
// NewAmazonSQSConfig creates a new Config with default values.
func NewAmazonSQSConfig() AmazonSQSConfig {
return AmazonSQSConfig{
Region: "eu-west-1",
URL: "",
Credentials: AmazonAWSCredentialsConfig{
ID: "",
Secret: "",
Token: "",
Role: "",
},
TimeoutS: 5,
}
}
//------------------------------------------------------------------------------
// AmazonSQS is a benthos reader.Type implementation that reads messages from an
// Amazon SQS queue.
type AmazonSQS struct {
conf AmazonSQSConfig
pendingHandles []*sqs.DeleteMessageBatchRequestEntry
session *session.Session
sqs *sqs.SQS
log log.Modular
stats metrics.Type
}
// NewAmazonSQS creates a new Amazon SQS reader.Type.
func NewAmazonSQS(
conf AmazonSQSConfig,
log log.Modular,
stats metrics.Type,
) *AmazonSQS {
return &AmazonSQS{
conf: conf,
log: log.NewModule(".input.amazon_sqs"),
stats: stats,
}
}
// Connect attempts to establish a connection to the target SQS queue.
func (a *AmazonSQS) Connect() error {
if a.session != nil {
return nil
}
awsConf := aws.NewConfig()
if len(a.conf.Region) > 0 {
awsConf = awsConf.WithRegion(a.conf.Region)
}
if len(a.conf.Credentials.ID) > 0 {
awsConf = awsConf.WithCredentials(credentials.NewStaticCredentials(
a.conf.Credentials.ID,
a.conf.Credentials.Secret,
a.conf.Credentials.Token,
))
}
sess, err := session.NewSession(awsConf)
if err != nil {
return err
}
if len(a.conf.Credentials.Role) > 0 {
sess.Config = sess.Config.WithCredentials(
stscreds.NewCredentials(sess, a.conf.Credentials.Role),
)
}
a.sqs = sqs.New(sess)
a.session = sess
a.log.Infof("Receiving Amazon SQS messages from URL: %v\n", a.conf.URL)
return nil
}
// Read attempts to read a new message from the target SQS.
func (a *AmazonSQS) Read() (types.Message, error) {
if a.session == nil {
return nil, types.ErrNotConnected
}
output, err := a.sqs.ReceiveMessage(&sqs.ReceiveMessageInput{
QueueUrl: aws.String(a.conf.URL),
MaxNumberOfMessages: aws.Int64(1),
WaitTimeSeconds: aws.Int64(a.conf.TimeoutS),
})
if err != nil {
return nil, err
}
msg := message.New(nil)
if len(output.Messages) == 0 {
return nil, types.ErrTimeout
}
for _, sqsMsg := range output.Messages {
if sqsMsg.ReceiptHandle != nil {
a.pendingHandles = append(a.pendingHandles, &sqs.DeleteMessageBatchRequestEntry{
Id: sqsMsg.MessageId,
ReceiptHandle: sqsMsg.ReceiptHandle,
})
}
if sqsMsg.Body != nil {
msg.Append(message.NewPart([]byte(*sqsMsg.Body)))
}
}
if msg.Len() == 0 {
return nil, types.ErrTimeout
}
return msg, nil
}
// Acknowledge confirms whether or not our unacknowledged messages have been
// successfully propagated or not.
func (a *AmazonSQS) Acknowledge(err error) error {
if _, err := a.sqs.DeleteMessageBatch(&sqs.DeleteMessageBatchInput{
QueueUrl: aws.String(a.conf.URL),
Entries: a.pendingHandles,
}); err != nil {
return err
}
a.pendingHandles = nil
return nil
}
// CloseAsync begins cleaning up resources used by this reader asynchronously.
func (a *AmazonSQS) CloseAsync() {
}
// WaitForClose will block until either the reader is closed or a specified
// timeout occurs.
func (a *AmazonSQS) WaitForClose(time.Duration) error {
return nil
}
//------------------------------------------------------------------------------