openfaas-sqs-connector

An OpenFaaS connector for AWS SQS.

Goals

• Allow OpenFaaS functions to be invoked as a result of messages being sent to an AWS SQS queue.
• Allow for multiplexing different topics over a single AWS SQS queue.

Installing

Helm (Experimental)

To install openfaas-sqs-connector using Helm, run

$ helm repo add openfaas-sqs-connector https://form3tech-oss.github.io/openfaas-sqs-connector

$ helm repo update

$ helm upgrade --install openfaas-sqs-connector openfaas-sqs-connector/openfaas-sqs-connector \
  --namespace openfaas \
  --set queueUrl=<queue-url> \
  --set region=<region>

Please check values.yaml for details on how to tweak the installation.

kubectl

To install openfaas-sqs-connector using kubectl, edit ./deploy/kubernetes/openfaas-sqs-connector-dep.yaml as required in order to set appropriate values for each flag:

Flag	Description	Default
--endpoint	The AWS SQS endpoint to use. Useful when using elasticmq for local development.	""
--log-level	The log level to use.	info
--max-number-of-messages	The maximum number of messages to return from the AWS SQS queue per iteration.	1
--max-wait-time	The maximum amount of time (in seconds) to wait for messages to be returned from the AWS SQS queue per iteration.	1
--openfaas-gateway-url	The URL at which the OpenFaaS gateway can be reached.	http://gateway.openfaas.svc:8080
--queue-url	The name of the AWS SQS queue to pop messages from.	N/A
--region	The AWS region to which the AWS SQS queue belongs.	N/A
--topic-refresh-interval	The interval (in seconds) at which to rebuild the topic map.	15
--visibility-timeout	The amount of time (in seconds) during which received messages are unavailable to other consumers.	30

Then, run

$ kubectl create -f ./deploy/kubernetes/openfaas-sqs-connector-dep.yaml

Permissions

You will need to make sure your Kubernetes worker nodes on which the SQS Connector will be deployed have a role with the following IAM permissions to interact with your SQS queues:

• sqs:DeleteMessage
• sqs:ChangeMessageVisibility
• sqs:ReceiveMessage

Testing

Kubernetes

To test openfaas-sqs-connector, start by deploying two functions:

$ faas store deploy figlet --annotation topic="figlet"
Deployed. 202 Accepted.
URL: https://openfaas.example.com/function/figlet

$ faas store deploy nslookup --annotation topic="nslookup"
Deployed. 202 Accepted.
URL: https://openfaas.example.com/function/nslookup

Now, send two messages to the AWS SQS queue from which openfaas-sqs-connector is consuming messages:

$ aws sqs send-message \
    --queue-url https://sqs.eu-west-1.amazonaws.com/<id>/openfaas-sqs-connector \
    --message-attributes '{"Topic":{"DataType":"String","StringValue":"figlet"}}' \
    --message-body "openfaas"
{
    "MD5OfMessageBody": "f6650c4b9f5c1c7c627a9d150da3461b",
    "MD5OfMessageAttributes": "dc49cdc863571fa19ce0f748008752ba",
    "MessageId": "daad6027-9503-4952-b1de-4b29314f2048"
}

$ aws sqs send-message \
    --queue-url https://sqs.eu-west-1.amazonaws.com/<id>/openfaas-sqs-connector \
    --message-attributes '{"Topic":{"DataType":"String","StringValue":"nslookup"}}' \
    --message-body "github.com"
{
    "MD5OfMessageBody": "99cd2175108d157588c04758296d1cfc",
    "MD5OfMessageAttributes": "b1badaf4137a97afea1027b635e3ac70",
    "MessageId": "5f24f4a4-ae41-4654-9ab5-acdd2fe5ac28"
}

Note that we're using different values for the Topic message attribute⸺figlet and nslookup⸺, and that these correspond to the value of the topic annotation we've used above.

Finally, check the logs for openfaas-sqs-connector in order to make sure the corresponding functions were invoked:

$ kubectl -n openfaas logs -l app=openfaas-sqs-connector
(...)
time="2019-09-06T10:36:53Z" level=trace msg="Processing message with id \"daad6027-9503-4952-b1de-4b29314f2048\""
2019/09/06 10:36:53 Invoke function: figlet
2019/09/06 10:36:53 connector-sdk got result: [200] figlet => figlet (270) bytes
[200] figlet => figlet
                         __
  ___  _ __   ___ _ __  / _| __ _  __ _ ___
 / _ \| '_ \ / _ \ '_ \| |_ / _` |/ _` / __|
| (_) | |_) |  __/ | | |  _| (_| | (_| \__ \
 \___/| .__/ \___|_| |_|_|  \__,_|\__,_|___/
      |_|
[openfaas-sqs-connector-5f564d8-mk9h6 openfaas-sqs-connector]
time="2019-09-06T10:36:53Z" level=trace msg="Message successfully processed" message_id=daad6027-9503-4952-b1de-4b29314f2048
time="2019-09-06T10:36:53Z" level=trace msg="Message successfully deleted from the queue" message_id=daad6027-9503-4952-b1de-4b29314f2048
(...)
time="2019-09-06T10:37:11Z" level=trace msg="Processing message with id \"5f24f4a4-ae41-4654-9ab5-acdd2fe5ac28\""
2019/09/06 10:37:11 Invoke function: nslookup
2019/09/06 10:37:11 connector-sdk got result: [200] nslookup => nslookup (78) bytes
[200] nslookup => nslookup
[openfaas-sqs-connector-5f564d8-mk9h6 openfaas-sqs-connector]
Name:      github.com
Address 1: 140.82.118.4 lb-140-82-118-4-ams.github.com
[openfaas-sqs-connector-5f564d8-mk9h6 openfaas-sqs-connector]
time="2019-09-06T10:37:11Z" level=trace msg="Message successfully processed" message_id=5f24f4a4-ae41-4654-9ab5-acdd2fe5ac28
time="2019-09-06T10:37:11Z" level=trace msg="Message successfully deleted from the queue" message_id=5f24f4a4-ae41-4654-9ab5-acdd2fe5ac28