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| if err != nil { | ||
| worker.span.LogFields(slog.String("grabbit", "failed processing duplicate")) | ||
| worker.log().WithError(err).Error("failed checking for existing message") | ||
| return true, err |
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why returning true if you don't know the message really is a duplicate?
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you can't return nil for a bool value so I return true and an error
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@vladshub I would return the default value of a bool in go which is false
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@rhinof this way I'm more conservative since I'd rather have this message rejected as a duplicate and go to DLQ or through the error flow then to have processed it twice if I can't ensure deduplication.
| return | ||
| } | ||
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| isDuplicate, err := worker.handleDuplicates(bm, delivery, msgSpecificLogEntry) |
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wouldnt you want to "handle duplicates" in case of global handlers/ dead letter handlers invocation as well?
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the deduplication is on the GbusMessage level in dlq/global we don't yet have the gbusMessage yet
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| // | ||
| func (d *deduper) StoreMessageID(tx *sql.Tx, id string) error { |
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did you consider to store the message in another storage mechanism? like redis etc.
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I didn't want to introduce another infrastructure dependency but we can have different storages that would implement the same interface.
@rhinof we can but if we do that we can't guarantee that a service will receive only one since issues with the connection to rabbitmq might create additional duplications and also the time a message is in-flight might provide for additional duplications. |
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| var _ deduplicator.Store = &deduper{} | ||
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| type deduper struct { |
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nitpicking, the struct is named deduper which is the main struct here yet the file name is tx.go
gbus/worker.go
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| if worker.delicatePolicy == DeduplicationPolicyNone { | ||
| return false, nil | ||
| } | ||
| duplicate, err := worker.duplicateStore.MessageExists(message.IdempotencyKey) |
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shouldn't we be passing in the active transaction ?
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For message exists there is no real need, we can and we pass in the StoreMessage but here it brings no to little value
…ay to close the deduplicator
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@rhinof & @adiweiss can you please re-review? |
3 participants
A way to manage message de-duplication in grabbit.
Implementation details:
This PR closes issue #33