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pre and post dispatch weights of OnDeliveryConfirmed callback (#1040)

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* pre and post dispatch weights of OnDeliveryConfirmed callback

* Update modules/messages/README.md

Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>

* clippy + compilation

* fix test issue from parallel PR

Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
This commit is contained in:
Svyatoslav Nikolsky
2021-07-02 12:30:08 +03:00
committed by Bastian Köcher
parent 166b5309e6
commit dfdd541bc9
8 changed files with 228 additions and 25 deletions
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bridges/modules/messages/README.md
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@@ -354,7 +354,7 @@ Both conditions are verified by `pallet_bridge_messages::ensure_weights_are_corr
`pallet_bridge_messages::ensure_able_to_receive_messages` functions, which must be called from every
runtime's tests.
### Post-dispatch weight refunds of the `receive_messages_proof` call
#### Post-dispatch weight refunds of the `receive_messages_proof` call
Weight formula of the `receive_messages_proof` call assumes that the dispatch fee of every message is
paid at the target chain (where call is executed), that every message will be dispatched and that
@@ -388,6 +388,7 @@ The weight formula is:
Weight = BaseWeight + MessagesCount * MessageConfirmationWeight
+ RelayersCount * RelayerRewardWeight
+ Max(0, ActualProofSize - ExpectedProofSize) * ProofByteDeliveryWeight
+ MessagesCount * (DbReadWeight + DbWriteWeight)
```
Where:
@@ -403,6 +404,15 @@ Where:
| `ExpectedProofSize` | `EXTRA_STORAGE_PROOF_SIZE` | Size of proof that we are expecting |
| `ProofByteDeliveryWeight` | `(receive_single_message_proof_16_kb - receive_single_message_proof_1_kb) / (15 * 1024)` | Weight of processing every additional proof byte over `ExpectedProofSize` limit. We're using the same formula, as for message delivery, because proof mechanism is assumed to be the same in both cases |
#### Post-dispatch weight refunds of the `receive_messages_delivery_proof` call
Weight formula of the `receive_messages_delivery_proof` call assumes that all messages in the proof
are actually delivered (so there are no already confirmed messages) and every messages is processed
by the `OnDeliveryConfirmed` callback. This means that for every message, we're adding single db read
weight and single db write weight. If, by some reason, messages are not processed by the
`OnDeliveryConfirmed` callback, or their processing is faster than that additional weight, the
difference is refunded to the submitter.
#### Why we're always able to craft `receive_messages_delivery_proof` transaction?
There can be at most `<PeerRuntime as pallet_bridge_messages::Config>::MaxUnconfirmedMessagesAtInboundLane`