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<title>RFC-0013: Prepare Core runtime API for MBMs - Polkadot Fellowship RFCs</title>
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<ol class="chapter"><li class="chapter-item expanded affix "><a href="../introduction.html">Introduction</a></li><li class="spacer"></li><li class="chapter-item expanded affix "><li class="part-title">Newly Proposed</li><li class="chapter-item expanded "><a href="../new/0126-introduce-xcq.html">RFC-0126: Introduce XCQ(Cross Consensus Query)</a></li><li class="spacer"></li><li class="chapter-item expanded affix "><li class="part-title">Proposed</li><li class="chapter-item expanded "><a href="../proposed/0102-offchain-parachain-runtime-upgrades.html">RFC-0000: Feature Name Here</a></li><li class="chapter-item expanded "><a href="../proposed/0111-pure-proxy-replication.html">RFC-0111: Pure Proxy Replication</a></li><li class="chapter-item expanded "><a href="../proposed/0114-secp256r1-hostfunction.html">RFC-0114: Introduce secp256r1_ecdsa_verify_prehashed Host Function to verify NIST-P256 elliptic curve signatures</a></li><li class="chapter-item expanded "><a href="../proposed/0117-unbrick-collective.html">RFC-0117: The Unbrick Collective</a></li><li class="chapter-item expanded "><a href="../proposed/0121-iterable-referenda-tracks.html">RFC-0121: Iterable Referenda Tracks</a></li><li class="chapter-item expanded "><a href="../proposed/0123-pending-code-as-storage-location-for-runtime-upgrades.html">RFC-0123: Introduce :pending_code as intermediate storage key for the runtime code</a></li><li class="chapter-item expanded "><a href="../proposed/0124-extrinsic-version-5.html">RFC-0124: Extrinsic version 5</a></li><li class="chapter-item expanded "><a href="../proposed/0125-xcm-asset-metadata.html">RFC-0125: XCM Asset Metadata</a></li><li class="chapter-item expanded "><a href="../proposed/RFC-114 Adjust Tipper Track Confirmation Periods.html">RFC-114: Adjust Tipper Track Confirmation Periods</a></li><li class="spacer"></li><li class="chapter-item expanded affix "><li class="part-title">Approved</li><li class="chapter-item expanded "><a href="../approved/0001-agile-coretime.html">RFC-1: Agile Coretime</a></li><li class="chapter-item expanded "><a href="../approved/0005-coretime-interface.html">RFC-5: Coretime Interface</a></li><li class="chapter-item expanded "><a href="../approved/0007-system-collator-selection.html">RFC-0007: System Collator Selection</a></li><li class="chapter-item expanded "><a href="../approved/0008-parachain-bootnodes-dht.html">RFC-0008: Store parachain bootnodes in relay chain DHT</a></li><li class="chapter-item expanded "><a href="../approved/0010-burn-coretime-revenue.html">RFC-0010: Burn Coretime Revenue</a></li><li class="chapter-item expanded "><a href="../approved/0012-process-for-adding-new-collectives.html">RFC-0012: Process for Adding New System Collectives</a></li><li class="chapter-item expanded "><a href="../approved/0013-prepare-blockbuilder-and-core-runtime-apis-for-mbms.html" class="active">RFC-0013: Prepare Core runtime API for MBMs</a></li><li class="chapter-item expanded "><a href="../approved/0014-improve-locking-mechanism-for-parachains.html">RFC-0014: Improve locking mechanism for parachains</a></li><li class="chapter-item expanded "><a href="../approved/0022-adopt-encointer-runtime.html">RFC-0022: Adopt Encointer Runtime</a></li><li class="chapter-item expanded "><a href="../approved/0026-sassafras-consensus.html">RFC-0026: Sassafras Consensus Protocol</a></li><li class="chapter-item expanded "><a href="../approved/0032-minimal-relay.html">RFC-0032: Minimal Relay</a></li><li class="chapter-item expanded "><a href="../approved/0042-extrinsics-state-version.html">RFC-0042: Add System version that replaces StateVersion on RuntimeVersion</a></li><li class="chapter-item expanded "><a href="../approved/0043-storage-proof-size-hostfunction.html">RFC-0043: Introduce storage_proof_size Host Function for Improved Parachain Block Utilization</a></li><li class="chapter-item expanded "><a href="../approved/0045-nft-deposits-asset-hub.html">RFC-0045: Lowering NFT Deposits on Asset Hub</a></li><li class="chapter-item expanded "><a href="../approved/0047-assignment-of-availability-chunks.html">RFC-0047: Assignment of availability chunks to validators</a></li><li class="chapter-item expanded "><a href="../approved/0048-session-keys-runtime-api.html">RFC-0048: Generate ownership proof for SessionKeys</a></li><li class="chapter-item expanded "><a href="../approved/0050-fellowship-salaries.html">RFC-0050: Fellowship Salaries</a></li><li class="chapter-item expanded "><a href="../approved/0056-one-transaction-per-notification.html">RFC-0056: Enforce only one transaction per notification</a></li><li class="chapter-item expanded "><a href="../approved/0059-nodes-capabilities-discovery.html">RFC-0059: Add a discovery mechanism for nodes based on their capabilities</a></li><li class="chapter-item expanded "><a href="../approved/0078-merkleized-metadata.html">RFC-0078: Merkleized Metadata</a></li><li class="chapter-item expanded "><a href="../approved/0084-general-transaction-extrinsic-format.html">RFC-0084: General transactions in extrinsic format</a></li><li class="chapter-item expanded "><a href="../approved/0091-dht-record-creation-time.html">RFC-0091: DHT Authority discovery record creation time</a></li><li class="chapter-item expanded "><a href="../approved/0097-unbonding_queue.html">RFC-0097: Unbonding Queue</a></li><li class="chapter-item expanded "><a href="../approved/0099-transaction-extension-version.html">RFC-0099: Introduce a transaction extension version</a></li><li class="chapter-item expanded "><a href="../approved/0100-xcm-multi-type-asset-transfer.html">RFC-0100: New XCM instruction: InitiateAssetsTransfer</a></li><li class="chapter-item expanded "><a href="../approved/0101-xcm-transact-remove-max-weight-param.html">RFC-0101: XCM Transact remove require_weight_at_most parameter</a></li><li class="chapter-item expanded "><a href="../approved/0103-introduce-core-index-commitment.html">RFC-0103: Introduce a CoreIndex commitment and a SessionIndex field in candidate receipts</a></li><li class="chapter-item expanded "><a href="../approved/0105-xcm-improved-fee-mechanism.html">RFC-0105: XCM improved fee mechanism</a></li><li class="chapter-item expanded "><a href="../approved/0107-xcm-execution-hints.html">RFC-0107: XCM Execution hints</a></li><li class="chapter-item expanded "><a href="../approved/0108-xcm-remove-testnet-ids.html">RFC-0108: Remove XCM testnet NetworkIds</a></li><li class="chapter-item expanded "><a href="../approved/0122-alias-origin-on-asset-transfers.html">RFC-0122: Asset transfers can alias XCM origin on destination to original origin</a></li><li class="spacer"></li><li class="chapter-item expanded affix "><li class="part-title">Stale</li><li class="chapter-item expanded "><a href="../stale/0000-rewards.html">RFC-0000: Validator Rewards</a></li><li class="chapter-item expanded "><a href="../stale/0004-remove-unnecessary-allocator-usage.html">RFC-0004: Remove the host-side runtime memory allocator</a></li><li class="chapter-item expanded "><a href="../stale/0006-dynamic-pricing-for-bulk-coretime-sales.html">RFC-0006: Dynamic Pricing for Bulk Coretime Sales</a></li><li class="chapter-item expanded "><a href="../stale/0009-improved-net-light-client-requests.html">RFC-0009: Improved light client requests networking protocol</a></li><li class="chapter-item expanded "><a href="../stale/0015-market-design-revisit.html">RFC-0015: Market Design Revisit</a></li><li class="chapter-item expanded "><a href="../stale/0034-xcm-absolute-location-account-derivation.html">RFC-34: XCM Absolute Location Account Derivation</a></li><li class="chapter-item expanded "><a href="../stale/0035-conviction-voting-delegation-modifications.html"> RFC-0035: Conviction Voting Delegation Modifications</a></li><li class="chapter-item expanded "><a href="../stale/0044-rent-based-registration.html">RFC-0044: Rent based registration model</a></li><li class="chapter-item expanded "><a href="../stale/0054-remove-heap-pages.html">RFC-0054: Remove the concept of "heap pages" from the client</a></li><li class="chapter-item expanded "><a href="../stale/0070-x-track-kusamanetwork.html">RFC-0070: X Track for @kusamanetwork</a></li><li class="chapter-item expanded "><a href="../stale/0073-referedum-deposit-track.html">RFC-0073: Decision Deposit Referendum Track</a></li><li class="chapter-item expanded "><a href="../stale/0074-stateful-multisig-pallet.html">RFC-0074: Stateful Multisig Pallet</a></li><li class="chapter-item expanded "><a href="../stale/0077-increase-max-length-of-identity-pgp-fingerprint-value.html">RFC-0077: Increase maximum length of identity PGP fingerprint values from 20 bytes</a></li><li class="chapter-item expanded "><a href="../stale/0088-broker-pallet-slashable-deposit-purchaser-reputation-reserved-cores.html">RFC-0088: Add slashable locked deposit, purchaser reputation, and reserved cores for on-chain identities to broker pallet</a></li><li class="chapter-item expanded "><a href="../stale/0089-flexible-inflation.html">RFC-0089: Flexible Inflation</a></li><li class="chapter-item expanded "><a href="../stale/00xx-secondary-marketplace-for-regions.html">RFC-0001: Secondary Market for Regions</a></li><li class="chapter-item expanded "><a href="../stale/00xx-smart-contracts-coretime-chain.html">RFC-0002: Smart Contracts on the Coretime Chain</a></li><li class="chapter-item expanded "><a href="../stale/0106-xcm-remove-fees-mode.html">RFC-0106: Remove XCM fees mode</a></li><li class="chapter-item expanded "><a href="../stale/0112-compress-state-response-message-in-state-sync.html">RFC-0112: Compress the State Response Message in State Sync</a></li><li class="chapter-item expanded "><a href="../stale/0120-referenda-confirmation-by-candle-mechanism.html">RFC-0120: Referenda Confirmation by Candle Mechanism</a></li><li class="chapter-item expanded "><a href="../stale/TODO-stale-nomination-reward-curve.html">RFC-TODO: Stale Nomination Reward Curve</a></li></ol>
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<p><a href="https://github.com/polkadot-fellows/RFCs/blob/main/text/0013-prepare-blockbuilder-and-core-runtime-apis-for-mbms.md">(source)</a></p>
<p><strong>Table of Contents</strong></p>
<ul>
<li><a href="#rfc-0013-prepare-core-runtime-api-for-mbms">RFC-0013: Prepare <code>Core</code> runtime API for MBMs</a>
<ul>
<li><a href="#summary">Summary</a></li>
<li><a href="#motivation">Motivation</a></li>
<li><a href="#stakeholders">Stakeholders</a></li>
<li><a href="#explanation">Explanation</a>
<ul>
<li><a href="#coreinitialize_block"><code>Core::initialize_block</code></a></li>
</ul>
</li>
<li><a href="#drawbacks">Drawbacks</a></li>
<li><a href="#testing-security-and-privacy">Testing, Security, and Privacy</a></li>
<li><a href="#performance-ergonomics-and-compatibility">Performance, Ergonomics, and Compatibility</a>
<ul>
<li><a href="#performance">Performance</a></li>
<li><a href="#ergonomics">Ergonomics</a></li>
<li><a href="#compatibility">Compatibility</a></li>
</ul>
</li>
<li><a href="#prior-art-and-references">Prior Art and References</a></li>
<li><a href="#unresolved-questions">Unresolved Questions</a></li>
<li><a href="#future-directions-and-related-material">Future Directions and Related Material</a></li>
</ul>
</li>
</ul>
<h1 id="rfc-0013-prepare-core-runtime-api-for-mbms"><a class="header" href="#rfc-0013-prepare-core-runtime-api-for-mbms">RFC-0013: Prepare <code>Core</code> runtime API for MBMs</a></h1>
<div class="table-wrapper"><table><thead><tr><th></th><th></th></tr></thead><tbody>
<tr><td><strong>Start Date</strong></td><td>July 24, 2023</td></tr>
<tr><td><strong>Description</strong></td><td>Prepare the <code>Core</code> Runtime API for Multi-Block-Migrations</td></tr>
<tr><td><strong>Authors</strong></td><td>Oliver Tale-Yazdi</td></tr>
</tbody></table>
</div>
<h2 id="summary"><a class="header" href="#summary">Summary</a></h2>
<p>Introduces breaking changes to the <code>Core</code> runtime API by letting <code>Core::initialize_block</code> return an enum. The versions of <code>Core</code> is bumped from 4 to 5.</p>
<h2 id="motivation"><a class="header" href="#motivation">Motivation</a></h2>
<p>The main feature that motivates this RFC are Multi-Block-Migrations (MBM); these make it possible to split a migration over multiple blocks.<br />
Further it would be nice to not hinder the possibility of implementing a new hook <code>poll</code>, that runs at the beginning of the block when there are no MBMs and has access to <code>AllPalletsWithSystem</code>. This hook can then be used to replace the use of <code>on_initialize</code> and <code>on_finalize</code> for non-deadline critical logic.<br />
In a similar fashion, it should not hinder the future addition of a <code>System::PostInherents</code> callback that always runs after all inherents were applied.</p>
<h2 id="stakeholders"><a class="header" href="#stakeholders">Stakeholders</a></h2>
<ul>
<li>Substrate Maintainers: They have to implement this, including tests, audit and
maintenance burden.</li>
<li>Polkadot Runtime developers: They will have to adapt the runtime files to this breaking change.</li>
<li>Polkadot Parachain Teams: They have to adapt to the breaking changes but then eventually have
multi-block migrations available.</li>
</ul>
<h2 id="explanation"><a class="header" href="#explanation">Explanation</a></h2>
<h3 id="coreinitialize_block"><a class="header" href="#coreinitialize_block"><code>Core::initialize_block</code></a></h3>
<p>This runtime API function is changed from returning <code>()</code> to <code>ExtrinsicInclusionMode</code>:</p>
<pre><code class="language-patch">fn initialize_block(header: &amp;&lt;Block as BlockT&gt;::Header)
+ -&gt; ExtrinsicInclusionMode;
</code></pre>
<p>With <code>ExtrinsicInclusionMode</code> is defined as:</p>
<pre><pre class="playground"><code class="language-rust"><span class="boring">#![allow(unused)]
</span><span class="boring">fn main() {
</span>enum ExtrinsicInclusionMode {
/// All extrinsics are allowed in this block.
AllExtrinsics,
/// Only inherents are allowed in this block.
OnlyInherents,
}
<span class="boring">}</span></code></pre></pre>
<p>A block author MUST respect the <code>ExtrinsicInclusionMode</code> that is returned by <code>initialize_block</code>. The runtime MUST reject blocks that have non-inherent extrinsics in them while <code>OnlyInherents</code> was returned.</p>
<p>Coming back to the motivations and how they can be implemented with this runtime API change:</p>
<p><strong>1. Multi-Block-Migrations</strong>: The runtime is being put into lock-down mode for the duration of the migration process by returning <code>OnlyInherents</code> from <code>initialize_block</code>. This ensures that no user provided transaction can interfere with the migration process. It is absolutely necessary to ensure this, otherwise a transaction could call into un-migrated storage and violate storage invariants.</p>
<p><strong>2. <code>poll</code></strong> is possible by using <code>apply_extrinsic</code> as entry-point and not hindered by this approach. It would not be possible to use a pallet inherent like <code>System::last_inherent</code> to achieve this for two reasons: First is that pallets do not have access to <code>AllPalletsWithSystem</code> which is required to invoke the <code>poll</code> hook on all pallets. Second is that the runtime does currently not enforce an order of inherents. </p>
<p><strong>3. <code>System::PostInherents</code></strong> can be done in the same manner as <code>poll</code>.</p>
<h2 id="drawbacks"><a class="header" href="#drawbacks">Drawbacks</a></h2>
<p>The previous drawback of cementing the order of inherents has been addressed and removed by redesigning the approach. No further drawbacks have been identified thus far.</p>
<h2 id="testing-security-and-privacy"><a class="header" href="#testing-security-and-privacy">Testing, Security, and Privacy</a></h2>
<p>The new logic of <code>initialize_block</code> can be tested by checking that the block-builder will skip transactions when <code>OnlyInherents</code> is returned.</p>
<p>Security: n/a</p>
<p>Privacy: n/a</p>
<h2 id="performance-ergonomics-and-compatibility"><a class="header" href="#performance-ergonomics-and-compatibility">Performance, Ergonomics, and Compatibility</a></h2>
<h3 id="performance"><a class="header" href="#performance">Performance</a></h3>
<p>The performance overhead is minimal in the sense that no clutter was added after fulfilling the
requirements. The only performance difference is that <code>initialize_block</code> also returns an enum that needs to be passed through the WASM boundary. This should be negligible.</p>
<h3 id="ergonomics"><a class="header" href="#ergonomics">Ergonomics</a></h3>
<p>The new interface allows for more extensible runtime logic. In the future, this will be utilized for
multi-block-migrations which should be a huge ergonomic advantage for parachain developers.</p>
<h3 id="compatibility"><a class="header" href="#compatibility">Compatibility</a></h3>
<p>The advice here is OPTIONAL and outside of the RFC. To not degrade
user experience, it is recommended to ensure that an updated node can still import historic blocks.</p>
<h2 id="prior-art-and-references"><a class="header" href="#prior-art-and-references">Prior Art and References</a></h2>
<p>The RFC is currently being implemented in <a href="https://github.com/paritytech/polkadot-sdk/pull/1781">polkadot-sdk#1781</a> (formerly <a href="https://github.com/paritytech/substrate/pull/14275">substrate#14275</a>). Related issues and merge
requests:</p>
<ul>
<li><a href="https://github.com/paritytech/substrate/pull/14275">Simple multi block migrations</a></li>
<li><a href="https://github.com/paritytech/substrate/issues/9210">Execute a hook after inherent but before
transactions</a></li>
<li><a href="https://github.com/paritytech/substrate/issues/5757">There is no module hook after inherents and before
transactions</a></li>
</ul>
<h2 id="unresolved-questions"><a class="header" href="#unresolved-questions">Unresolved Questions</a></h2>
<p><del>Please suggest a better name for <code>BlockExecutiveMode</code>. We already tried: <code>RuntimeExecutiveMode</code>,
<code>ExtrinsicInclusionMode</code>. The names of the modes <code>Normal</code> and <code>Minimal</code> were also called
<code>AllExtrinsics</code> and <code>OnlyInherents</code>, so if you have naming preferences; please post them.</del><br />
=&gt; renamed to <code>ExtrinsicInclusionMode</code></p>
<p><del>Is <code>post_inherents</code> more consistent instead of <code>last_inherent</code>? Then we should change it.</del><br />
<del>=&gt; renamed to <code>last_inherent</code></del></p>
<h2 id="future-directions-and-related-material"><a class="header" href="#future-directions-and-related-material">Future Directions and Related Material</a></h2>
<p>The long-term future here is to move the block building logic into the runtime. Currently there is a tight dance between the block author and the runtime; the author has to call into different runtime functions in quick succession and exact order. Any misstep causes the block to be invalid.<br />
This can be unified and simplified by moving both parts into the runtime.</p>
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