feat: adds host simulation to block build #167

dylanlott · 2025-11-05T03:34:15Z

feat: adds host simulation to block build

This PR adds host simulation to the block build loop.

Note: Requires the signet-sdk release of 0.13.0 in order to pass CI.

bumps bin-base to 0.15.1
deprecates the BuilderHelper wrapper contract submission in favor of the raw Zenith contract
wires up the HostProvider into the Simulator for host transaction simulation

dylanlott · 2025-11-05T03:34:29Z

feat: adds host simulation to block build #167 : 2 dependent PRs (#169 , #171 ) 👈 (View in Graphite)
chore: remove builder helper in favor of flashbots #166
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src/tasks/block/sim.rs

Cargo.toml

src/tasks/submit/prep.rs

anna-carroll

nits

src/tasks/block/sim.rs

graphite-app · 2025-11-07T18:57:27Z

Merge activity

Nov 7, 6:57 PM UTC: Graphite rebased this pull request, because this pull request is set to merge when ready.
Nov 12, 7:14 PM UTC: @dylanlott merged this pull request with Graphite.

- properly builds a cfg env and block env from prev host header - makes max host gas a configurable property - cleans up the build prep in the sim loop

* fix: move block env creation for host to sim task * rename vars to clearly distinguish between rollup and host (#170) * comment --------- Co-authored-by: Anna Carroll <[email protected]> Co-authored-by: Anna Carroll <[email protected]>

…tion

…lder Helper

Evalir · 2025-11-12T10:04:56Z

src/config.rs

+    #[from_env(
+        var = "MAX_HOST_GAS_COEFFICIENT",
+        desc = "Optional maximum host gas coefficient, as a percentage, to use when building blocks",
+        default = 80


should we make this number a constant?

if this is a percentage, it should be f64, and explicitly capped to 99.9% (due to eth consensus rules on limit changes

Evalir · 2025-11-12T10:05:21Z

src/config.rs

+    /// Returns the maximum host gas to use for block building based on the configured max host gas coefficient.
+    pub fn max_host_gas(&self, gas_limit: u64) -> u64 {
+        // Set max host gas to a percentage of the host block gas limit
+        ((gas_limit as u128 * (self.max_host_gas_coefficient.unwrap_or(80) as u128)) / 100u128)


ditto, this should be a constant so there's only 1 place that needs to change if we decide to change the coefficient

honestly, I think that this should not be configurable right now. instead of having this be a config struct prop, we could just make it a constant 80%. we can make it configurable later if we want to

yeah i'm happy with that, I think it's safer that way and makes other builders understand that changing this means you're running modified software

Evalir · 2025-11-12T10:05:28Z

src/test_utils.rs

            1740681556, // pecorino start timestamp as sane default
            0, 1,
        ),
+        max_host_gas_coefficient: Some(80),


anna-carroll · 2025-11-12T15:42:23Z

src/tasks/env.rs

            let host_block_opt = res_unwrap_or_continue!(
                self.host_provider.get_block_by_number(host_block_number.into()).await,
                span,
                error!("error fetching previous host block - skipping block submission")


would love someone to check my logic here:

it’s occurring to me that if the Builder is configured to use a Host RPC served by a different Node than is running the Rollup ExEx and serving the Rollup RPC, then they are more likely to be out of sync which would cause reliability issues in the Env task

in testnet this is impossible to configure incorrectly because there is only one Host RPC and it’s the exact same Node as is running the ExEx for the Rollup RPC, but in mainnet it would be easy to configure incorrectly

if i'm right we should document this configuration need for Builders.

also, possibly add some retry logic for the Host RPC call

dylanlott mentioned this pull request Nov 5, 2025

chore: remove builder helper in favor of flashbots #166

Merged

dylanlott force-pushed the dylan/host-simulation branch from a2adc44 to 9b8137b Compare November 5, 2025 04:04

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dylanlott force-pushed the dylan/remove-builder-helper branch from 59afcac to cf31bc9 Compare November 5, 2025 19:38

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dylanlott force-pushed the dylan/host-simulation branch from 0c07c93 to eb5a2f7 Compare November 5, 2025 22:33

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dylanlott mentioned this pull request Nov 7, 2025

fix: move block env creation for host to env task #169

Merged

dylanlott marked this pull request as ready for review November 7, 2025 18:12

dylanlott requested a review from Evalir as a code owner November 7, 2025 18:12

dylanlott requested a review from prestwich November 7, 2025 18:55

dylanlott changed the base branch from dylan/remove-builder-helper to graphite-base/167 November 7, 2025 18:56

dylanlott force-pushed the dylan/host-simulation branch from 84b510e to 6166fcb Compare November 7, 2025 18:56

dylanlott force-pushed the graphite-base/167 branch from cf31bc9 to 7600937 Compare November 7, 2025 18:56

graphite-app bot changed the base branch from graphite-base/167 to main November 7, 2025 18:57

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dylanlott and others added 24 commits November 11, 2025 14:21

comment the patch deps for CI

5b347e8

wip: building with bin-base @ 0.16.0

6c020a2

fix block number handling in sim

4ef89d6

bump bin-base to 0.16 and remove git patch

6ddb7f6

fix cfg env

bbd2ad9

host env and rollup env fixes

87d3e25

- properly builds a cfg env and block env from prev host header - makes max host gas a configurable property - cleans up the build prep in the sim loop

fmt + clippy

3556288

fix: make calldata empty bytes array

2aa5cef

fix: use latest instead of specific block number for host sim db crea…

03a7b8b

…tion

logging for environment setup

809af49

moar logging around db and block heights

ea8d4a7

debug loggin for header comparison

6b672d9

logging

3365c39

fix: instantiate DB on previous block state

2bd05ad

refactor: DRY

8f61131

refactor: remove chain ids from config, use constants

281592e

fix: bug: submit to Zenith instead of Builder Helper. also remove Bui…

7c19009

…lder Helper

chore: remove some unnecessary arguments

78732db

refactor: remove zenith address from config, use constants

49c9846

lint: fmt

9b206ca

testing out host block number n + 1

31db020

refactor: DRY up the env construction function

e03d5e0

put it back

9c61587

anna-carroll force-pushed the dylan/host-simulation branch from b6d52e8 to 9c61587 Compare November 11, 2025 19:29

Evalir reviewed Nov 12, 2025

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anna-carroll reviewed Nov 12, 2025

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prestwich approved these changes Nov 12, 2025

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dylanlott merged commit 14a7e35 into main Nov 12, 2025
6 checks passed

dylanlott deleted the dylan/host-simulation branch November 12, 2025 19:14

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