go-shuttle serves as a wrapper around the azure service-bus go SDK to facilitate the implementation of a pub-sub pattern on Azure using service bus.
NOTE: This library is in early development and should be considered experimental. The api is still moving and can change. We do have breaking changes in v0.*. Use at your own risks.
We are assuming that both the publisher and the listener are using go-shuttle
The processor handles the message pump and feeds your message handler. It allows concurrent message handling and provides a message handler middleware pipeline to compose message handling behavior
MaxConcurrency and ReceiveInterval configures the concurrent message handling for the processor.
StartMaxAttempt and StartRetryDelayStrategy configures the retry behaviour for the processor.
// ProcessorOptions configures the processor
// MaxConcurrency defaults to 1. Not setting MaxConcurrency, or setting it to 0 or a negative value will fallback to the default.
// ReceiveInterval defaults to 2 seconds if not set.
// StartMaxAttempt defaults to 1 if not set (no retries). Not setting StartMaxAttempt, or setting it to non-positive value will fallback to the default.
// StartRetryDelayStrategy defaults to a fixed 5-second delay if not set.
type ProcessorOptions struct {
MaxConcurrency int
ReceiveInterval *time.Duration
StartMaxAttempt int
StartRetryDelayStrategy RetryDelayStrategy
}NewMultiProcessor takes in a list of receivers and a message handler. It creates a processor for each receiver and starts them concurrently.
see Processor and MultiProcessor examples
GoSHuttle provides a few middleware to simplify the implementation of the message handler in the application code
Forces the application handler implementation to return a Settlement. This prevents 2 common mistakes:
- Exit the handler without settling the message.
- Settling the message, but not exiting the handler (forgetting to return after calling abandon, for example)
Allows your handler implementation to just return error. the ManagedSettlingHandler settles the message based on your handler return value.
- nil = CompleteMessage
- error -> Abandon or Deadletter, depending on your configuration of the handler.
This middleware will renew the lock on each message every 30 seconds until the message is Completed or Abandoned.
renewInterval := 30 * time.Second
shuttle.NewRenewLockHandler(&shuttle.LockRenewalOptions{Interval: &renewInterval}, handler)see setup in Processor example
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