Support zero rate and below one message/second rate

[johanrhodin]

Is your feature request related to a problem? Please describe.

Running omq amqp-amqp --publisher-uri $TARGET --consumer-uri $TARGET -y 1 -x 1 --rate 0 results in the following:

Log with "panic"

time=2024-05-06T17:25:55.988Z level=INFO msg="consumer started" protocol=amqp-1.0 consumerId=1 terminus=/topic/omq
time=2024-05-06T17:25:55.988Z level=INFO msg="Waiting for all publishers and consumers to complete"
time=2024-05-06T17:25:56.227Z level=INFO msg="publisher started" protocol=AMQP-1.0 publisherId=1 rate=0 destination=/topic/omq
panic: non-positive interval for NewTicker

goroutine 28 [running]:
time.NewTicker(0xc0000a40d0?)
	/usr/local/go/src/time/tick.go:22 +0xe5
github.com/rabbitmq/omq/pkg/amqp10_client.Amqp10Publisher.StartRateLimited({0x1, 0xc00019e0f0, 0xc00047c000, {0xa37a71, 0xa}, {{0x7fffbf1e2c89, 0x64}, {0x7fffbf1e2cfd, 0x64}, 0x1, ...}, ...}, ...)
	/home/ubuntu/go/pkg/mod/github.com/rabbitmq/omq@v0.4.6-0.20240506131709-8bad78b9f771/pkg/amqp10_client/publisher.go:106 +0x1b9
github.com/rabbitmq/omq/pkg/amqp10_client.Amqp10Publisher.Start({0x1, 0xc00019e0f0, 0xc00047c000, {0xa37a71, 0xa}, {{0x7fffbf1e2c89, 0x64}, {0x7fffbf1e2cfd, 0x64}, 0x1, ...}, ...}, ...)
	/home/ubuntu/go/pkg/mod/github.com/rabbitmq/omq@v0.4.6-0.20240506131709-8bad78b9f771/pkg/amqp10_client/publisher.go:86 +0x12b
github.com/rabbitmq/omq/cmd.start.func3()
	/home/ubuntu/go/pkg/mod/github.com/rabbitmq/omq@v0.4.6-0.20240506131709-8bad78b9f771/cmd/root.go:282 +0x18f
created by github.com/rabbitmq/omq/cmd.start in goroutine 1
	/home/ubuntu/go/pkg/mod/github.com/rabbitmq/omq@v0.4.6-0.20240506131709-8bad78b9f771/cmd/root.go:275 +0x3b0

Setting the rate to a low number as as 0.01 is not accepted as input.

Describe the solution you'd like

Support zero rate and below 1 messages per second.

Describe alternatives you've considered

No response

Additional context

Both of them (zero-rate, and below 1/s) are useful for many clients with few messages scenarios ("IoT").

[annieblomgren]

I have a local branch for adding this but don't have access to push a new branch.
Is it possible to get access?

[lukebakken]

@annieblomgren - please see GitHub's documentation for creating a pull request:

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/creating-a-pull-request

Thank you for your contribution!

[mkuratczyk]

version 0.5.0 supports --rate 0. It just starts an idle publisher (if you don't want a publisher, use -x 0)