Struct risc0_steel::host::EvmEnvBuilder

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pub struct EvmEnvBuilder<P, H, B> { /* private fields */ }
Available on crate feature host only.
Expand description

Builder for constructing an EvmEnv instance on the host.

The EvmEnvBuilder is used to configure and create an EvmEnv, which is the environment in which the Ethereum Virtual Machine (EVM) operates. This builder provides flexibility in setting up the EVM environment by allowing configuration of RPC endpoints, block numbers, and other parameters.

§Usage

The builder can be created using EvmEnv::builder(). Various configurations can be chained to customize the environment before calling the build function to create the final EvmEnv.

§Type Parameters

  • P: The type of the RPC provider that interacts with the blockchain.
  • H: The type of the block header.
  • B: The type of the configuration to access the Beacon API.

Implementations§

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impl EvmEnvBuilder<(), EthBlockHeader, ()>

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pub fn rpc( self, url: Url, ) -> EvmEnvBuilder<RootProvider<Ethereum>, EthBlockHeader, ()>

Sets the Ethereum HTTP RPC endpoint that will be used by the EvmEnv.

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impl<H: EvmBlockHeader> EvmEnvBuilder<(), H, ()>

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pub fn provider<N, P>(self, provider: P) -> EvmEnvBuilder<P, H, ()>
where N: Network, P: Provider<N>, H: EvmBlockHeader + TryFrom<<N as Network>::HeaderResponse>, <H as TryFrom<<N as Network>::HeaderResponse>>::Error: Display,

Sets a custom [Provider] that will be used by the EvmEnv.

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impl<P> EvmEnvBuilder<P, EthBlockHeader, ()>

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pub fn beacon_api(self, url: Url) -> EvmEnvBuilder<P, EthBlockHeader, Url>

Sets the Beacon API URL for retrieving Ethereum Beacon block root commitments.

This function configures the EvmEnv to interact with an Ethereum Beacon chain. It assumes the use of the mainnet preset for consensus specs.

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impl<P, H, B> EvmEnvBuilder<P, H, B>

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pub fn block_number(self, number: u64) -> Self

Sets the block number to be used for the EVM execution.

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pub fn block_number_or_tag(self, block: BlockNumberOrTag) -> Self

Sets the block number or block tag (“latest”, “earliest”, “pending”) to be used for the EVM execution.

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pub fn block_hash(self, hash: B256) -> Self

Sets the block hash to be used for the EVM execution.

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pub fn eip1186_proof_chunk_size(self, chunk_size: usize) -> Self

Sets the chunk size for eth_getProof calls (EIP-1186).

This configures the number of storage keys to request in a single call. The default is 1000, but this can be adjusted based on the RPC node configuration.

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impl<P, H> EvmEnvBuilder<P, H, ()>

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pub async fn build<N>( self, ) -> Result<EvmEnv<ProofDb<ProviderDb<N, P>>, H, HostCommit<()>>>
where N: Network, P: Provider<N>, H: EvmBlockHeader + TryFrom<<N as Network>::HeaderResponse>, <H as TryFrom<<N as Network>::HeaderResponse>>::Error: Display,

Builds and returns an EvmEnv with the configured settings that commits to a block hash.

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impl<P> EvmEnvBuilder<P, EthBlockHeader, Url>

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pub fn commitment_block_hash( self, hash: BlockHash, ) -> EvmEnvBuilder<P, EthBlockHeader, History>

Available on crate feature unstable-history only.

Sets the block hash for the commitment block, which can be different from the execution block.

This allows for historical state execution while maintaining security through a more recent commitment. The commitment block must be more recent than the execution block.

Note that this feature requires a Beacon chain RPC provider, as it relies on EIP-4788.

§Example
let commitment_hash = B256::from_str("0x1234...")?;
let builder = EthEvmEnv::builder()
    .rpc(Url::parse("https://ethereum-rpc.publicnode.com")?)
    .beacon_api(Url::parse("https://ethereum-beacon-api.publicnode.com")?)
    .block_number(1_000_000);  // execute against historical state
let builder = builder.commitment_block_hash(commitment_hash); // commit to recent block
let env = builder.build().await?;
§Availability

This API is marked as unstable and is only available when the unstable-history crate feature is enabled. This comes with no stability guarantees, and could be changed or removed at any time.

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pub fn commitment_block_number_or_tag( self, block: BlockNumberOrTag, ) -> EvmEnvBuilder<P, EthBlockHeader, History>

Available on crate feature unstable-history only.

Sets the block number or block tag (“latest”, “earliest”, “pending”) for the commitment.

See EvmEnvBuilder::commitment_block_hash for detailed documentation.

§Availability

This API is marked as unstable and is only available when the unstable-history crate feature is enabled. This comes with no stability guarantees, and could be changed or removed at any time.

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pub fn commitment_block_number( self, number: BlockNumber, ) -> EvmEnvBuilder<P, EthBlockHeader, History>

Available on crate feature unstable-history only.

Sets the block number for the commitment.

See EvmEnvBuilder::commitment_block_hash for detailed documentation.

§Availability

This API is marked as unstable and is only available when the unstable-history crate feature is enabled. This comes with no stability guarantees, and could be changed or removed at any time.

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pub async fn build( self, ) -> Result<EthEvmEnv<ProofDb<ProviderDb<Ethereum, P>>, HostCommit<BeaconCommit>>>
where P: Provider<Ethereum>,

Builds and returns an EvmEnv with the configured settings that commits to a beacon root.

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impl<P> EvmEnvBuilder<P, EthBlockHeader, History>

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pub async fn build( self, ) -> Result<EthEvmEnv<ProofDb<ProviderDb<Ethereum, P>>, HostCommit<HistoryCommit>>>
where P: Provider<Ethereum>,

Available on crate feature unstable-history only.

Builds and returns an EvmEnv with the configured settings, using a dedicated commitment block that is different from the execution block.

§Availability

This API is marked as unstable and is only available when the unstable-history crate feature is enabled. This comes with no stability guarantees, and could be changed or removed at any time.

Trait Implementations§

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impl<P: Clone, H: Clone, B: Clone> Clone for EvmEnvBuilder<P, H, B>

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fn clone(&self) -> EvmEnvBuilder<P, H, B>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<P: Debug, H: Debug, B: Debug> Debug for EvmEnvBuilder<P, H, B>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<P, H, B> Freeze for EvmEnvBuilder<P, H, B>
where P: Freeze, B: Freeze,

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impl<P, H, B> RefUnwindSafe for EvmEnvBuilder<P, H, B>
where P: RefUnwindSafe, B: RefUnwindSafe, H: RefUnwindSafe,

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impl<P, H, B> Send for EvmEnvBuilder<P, H, B>
where P: Send, B: Send, H: Send,

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impl<P, H, B> Sync for EvmEnvBuilder<P, H, B>
where P: Sync, B: Sync, H: Sync,

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impl<P, H, B> Unpin for EvmEnvBuilder<P, H, B>
where P: Unpin, B: Unpin, H: Unpin,

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impl<P, H, B> UnwindSafe for EvmEnvBuilder<P, H, B>
where P: UnwindSafe, B: UnwindSafe, H: UnwindSafe,

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