cast::backend

Struct CowBackend

pub struct CowBackend<'a> {
    pub backend: Cow<'a, Backend>,
    is_initialized: bool,
    spec_id: SpecId,
}
Expand description

A wrapper around Backend that ensures only revm::DatabaseRef functions are called.

Any changes made during its existence that affect the caching layer of the underlying Database will result in a clone of the initial Database. Therefore, this backend type is basically a clone-on-write Backend, where cloning is only necessary if cheatcodes will modify the Backend

Entire purpose of this type is for fuzzing. A test function fuzzer will repeatedly execute the function via immutable raw (no state changes) calls.

N.B.: we’re assuming cheatcodes that alter the state (like multi fork swapping) are niche. If they executed, it will require a clone of the initial input database. This way we can support these cheatcodes cheaply without adding overhead for tests that don’t make use of them. Alternatively each test case would require its own Backend clone, which would add significant overhead for large fuzz sets even if the Database is not big after setup.

Fields§

§backend: Cow<'a, Backend>

The underlying Backend.

No calls on the CowBackend will ever persistently modify the backend’s state.

§is_initialized: bool§spec_id: SpecId

Implementations§

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impl<'a> CowBackend<'a>

pub fn new_borrowed(backend: &'a Backend) -> CowBackend<'a>

Creates a new CowBackend with the given Backend.

pub fn inspect<I>( &mut self, env: &mut EnvWithHandlerCfg, inspector: &mut I, ) -> Result<ResultAndState, Report>
where I: InspectorExt,

Executes the configured transaction of the env without committing state changes

Note: in case there are any cheatcodes executed that modify the environment, this will update the given env with the new values.

pub fn has_state_snapshot_failure(&self) -> bool

Returns whether there was a state snapshot failure in the backend.

This is bubbled up from the underlying Copy-On-Write backend when a revert occurs.

Trait Implementations§

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impl<'a> Clone for CowBackend<'a>

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fn clone(&self) -> CowBackend<'a>

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 Database for CowBackend<'_>

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type Error = DatabaseError

The database error type.
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fn basic( &mut self, address: Address, ) -> Result<Option<AccountInfo>, <CowBackend<'_> as Database>::Error>

Get basic account information.
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fn code_by_hash( &mut self, code_hash: FixedBytes<32>, ) -> Result<Bytecode, <CowBackend<'_> as Database>::Error>

Get account code by its hash.
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fn storage( &mut self, address: Address, index: Uint<256, 4>, ) -> Result<Uint<256, 4>, <CowBackend<'_> as Database>::Error>

Get storage value of address at index.
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fn block_hash( &mut self, number: u64, ) -> Result<FixedBytes<32>, <CowBackend<'_> as Database>::Error>

Get block hash by block number.
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impl DatabaseCommit for CowBackend<'_>

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fn commit(&mut self, changes: HashMap<Address, Account, RandomState>)

Commit changes to the database.
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impl DatabaseExt for CowBackend<'_>

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fn snapshot_state( &mut self, journaled_state: &JournaledState, env: &Env, ) -> Uint<256, 4>

Creates a new state snapshot at the current point of execution. Read more
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fn revert_state( &mut self, id: Uint<256, 4>, journaled_state: &JournaledState, current: &mut Env, action: RevertStateSnapshotAction, ) -> Option<JournaledState>

Reverts the snapshot if it exists Read more
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fn delete_state_snapshot(&mut self, id: Uint<256, 4>) -> bool

Deletes the state snapshot with the given id Read more
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fn delete_state_snapshots(&mut self)

Deletes all state snapshots.
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fn create_fork(&mut self, fork: CreateFork) -> Result<Uint<256, 4>, Report>

Creates a new fork but does not select it
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fn create_fork_at_transaction( &mut self, fork: CreateFork, transaction: FixedBytes<32>, ) -> Result<Uint<256, 4>, Report>

Creates a new fork but does not select it
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fn select_fork( &mut self, id: Uint<256, 4>, env: &mut Env, journaled_state: &mut JournaledState, ) -> Result<(), Report>

Selects the fork’s state Read more
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fn roll_fork( &mut self, id: Option<Uint<256, 4>>, block_number: u64, env: &mut Env, journaled_state: &mut JournaledState, ) -> Result<(), Report>

Updates the fork to given block number. Read more
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fn roll_fork_to_transaction( &mut self, id: Option<Uint<256, 4>>, transaction: FixedBytes<32>, env: &mut Env, journaled_state: &mut JournaledState, ) -> Result<(), Report>

Updates the fork to given transaction hash Read more
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fn transact( &mut self, id: Option<Uint<256, 4>>, transaction: FixedBytes<32>, env: Env, journaled_state: &mut JournaledState, inspector: &mut dyn InspectorExt, ) -> Result<(), Report>

Fetches the given transaction for the fork and executes it, committing the state in the DB
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fn transact_from_tx( &mut self, transaction: &TransactionRequest, env: Env, journaled_state: &mut JournaledState, inspector: &mut dyn InspectorExt, ) -> Result<(), Report>

Executes a given TransactionRequest, commits the new state to the DB
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fn active_fork_id(&self) -> Option<Uint<256, 4>>

Returns the ForkId that’s currently used in the database, if fork mode is on
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fn active_fork_url(&self) -> Option<String>

Returns the Fork url that’s currently used in the database, if fork mode is on
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fn ensure_fork(&self, id: Option<Uint<256, 4>>) -> Result<Uint<256, 4>, Report>

Ensures that an appropriate fork exists Read more
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fn ensure_fork_id(&self, id: Uint<256, 4>) -> Result<&ForkId, Report>

Ensures that a corresponding ForkId exists for the given local id
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fn diagnose_revert( &self, callee: Address, journaled_state: &JournaledState, ) -> Option<RevertDiagnostic>

Handling multiple accounts/new contracts in a multifork environment can be challenging since every fork has its own standalone storage section. So this can be a common error to run into: Read more
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fn load_allocs( &mut self, allocs: &BTreeMap<Address, GenesisAccount>, journaled_state: &mut JournaledState, ) -> Result<(), BackendError>

Loads the account allocs from the given allocs map into the passed JournaledState. Read more
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fn clone_account( &mut self, source: &GenesisAccount, target: &Address, journaled_state: &mut JournaledState, ) -> Result<(), BackendError>

Copies bytecode, storage, nonce and balance from the given genesis account to the target address. Read more
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fn is_persistent(&self, acc: &Address) -> bool

Returns true if the given account is currently marked as persistent.
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fn remove_persistent_account(&mut self, account: &Address) -> bool

Revokes persistent status from the given account.
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fn add_persistent_account(&mut self, account: Address) -> bool

Marks the given account as persistent.
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fn allow_cheatcode_access(&mut self, account: Address) -> bool

Grants cheatcode access for the given account Read more
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fn revoke_cheatcode_access(&mut self, account: &Address) -> bool

Revokes cheatcode access for the given account Read more
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fn has_cheatcode_access(&self, account: &Address) -> bool

Returns true if the given account is allowed to execute cheatcodes
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fn set_blockhash( &mut self, block_number: Uint<256, 4>, block_hash: FixedBytes<32>, )

Set the blockhash for a given block number. Read more
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fn create_select_fork( &mut self, fork: CreateFork, env: &mut Env, journaled_state: &mut JournaledState, ) -> Result<Uint<256, 4>, Report>

Creates and also selects a new fork Read more
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fn create_select_fork_at_transaction( &mut self, fork: CreateFork, env: &mut Env, journaled_state: &mut JournaledState, transaction: FixedBytes<32>, ) -> Result<Uint<256, 4>, Report>

Creates and also selects a new fork Read more
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fn is_forked_mode(&self) -> bool

Whether the database is currently in forked mode.
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fn remove_persistent_accounts( &mut self, accounts: impl IntoIterator<Item = Address>, )
where Self: Sized,

Removes persistent status from all given accounts.
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fn extend_persistent_accounts( &mut self, accounts: impl IntoIterator<Item = Address>, )
where Self: Sized,

Extends the persistent accounts with the accounts the iterator yields.
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fn ensure_cheatcode_access(&self, account: &Address) -> Result<(), BackendError>

Ensures that account is allowed to execute cheatcodes Read more
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fn ensure_cheatcode_access_forking_mode( &self, account: &Address, ) -> Result<(), BackendError>

Same as Self::ensure_cheatcode_access() but only enforces it if the backend is currently in forking mode
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impl DatabaseRef for CowBackend<'_>

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type Error = DatabaseError

The database error type.
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fn basic_ref( &self, address: Address, ) -> Result<Option<AccountInfo>, <CowBackend<'_> as DatabaseRef>::Error>

Get basic account information.
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fn code_by_hash_ref( &self, code_hash: FixedBytes<32>, ) -> Result<Bytecode, <CowBackend<'_> as DatabaseRef>::Error>

Get account code by its hash.
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fn storage_ref( &self, address: Address, index: Uint<256, 4>, ) -> Result<Uint<256, 4>, <CowBackend<'_> as DatabaseRef>::Error>

Get storage value of address at index.
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fn block_hash_ref( &self, number: u64, ) -> Result<FixedBytes<32>, <CowBackend<'_> as DatabaseRef>::Error>

Get block hash by block number.
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impl<'a> Debug for CowBackend<'a>

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

Formats the value using the given formatter. Read more

Auto Trait Implementations§

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impl<'a> Freeze for CowBackend<'a>

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impl<'a> !RefUnwindSafe for CowBackend<'a>

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impl<'a> Send for CowBackend<'a>

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impl<'a> Sync for CowBackend<'a>

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impl<'a> Unpin for CowBackend<'a>

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impl<'a> !UnwindSafe for CowBackend<'a>

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where R: 'a,

Borrows self and passes that borrow into the pipe function. Read more
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fn pipe_ref_mut<'a, R>(&'a mut self, func: impl FnOnce(&'a mut Self) -> R) -> R
where R: 'a,

Mutably borrows self and passes that borrow into the pipe function. Read more
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fn pipe_borrow<'a, B, R>(&'a self, func: impl FnOnce(&'a B) -> R) -> R
where Self: Borrow<B>, B: 'a + ?Sized, R: 'a,

Borrows self, then passes self.borrow() into the pipe function. Read more
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fn pipe_borrow_mut<'a, B, R>( &'a mut self, func: impl FnOnce(&'a mut B) -> R, ) -> R
where Self: BorrowMut<B>, B: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.borrow_mut() into the pipe function. Read more
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fn pipe_as_ref<'a, U, R>(&'a self, func: impl FnOnce(&'a U) -> R) -> R
where Self: AsRef<U>, U: 'a + ?Sized, R: 'a,

Borrows self, then passes self.as_ref() into the pipe function.
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fn pipe_as_mut<'a, U, R>(&'a mut self, func: impl FnOnce(&'a mut U) -> R) -> R
where Self: AsMut<U>, U: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.as_mut() into the pipe function.
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fn pipe_deref<'a, T, R>(&'a self, func: impl FnOnce(&'a T) -> R) -> R
where Self: Deref<Target = T>, T: 'a + ?Sized, R: 'a,

Borrows self, then passes self.deref() into the pipe function.
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fn pipe_deref_mut<'a, T, R>( &'a mut self, func: impl FnOnce(&'a mut T) -> R, ) -> R
where Self: DerefMut<Target = T> + Deref, T: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.deref_mut() into the pipe function.
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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> Same for T

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type Output = T

Should always be Self
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impl<T> Tap for T

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fn tap(self, func: impl FnOnce(&Self)) -> Self

Immutable access to a value. Read more
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fn tap_mut(self, func: impl FnOnce(&mut Self)) -> Self

Mutable access to a value. Read more
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fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Self
where Self: Borrow<B>, B: ?Sized,

Immutable access to the Borrow<B> of a value. Read more
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fn tap_borrow_mut<B>(self, func: impl FnOnce(&mut B)) -> Self
where Self: BorrowMut<B>, B: ?Sized,

Mutable access to the BorrowMut<B> of a value. Read more
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fn tap_ref<R>(self, func: impl FnOnce(&R)) -> Self
where Self: AsRef<R>, R: ?Sized,

Immutable access to the AsRef<R> view of a value. Read more
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fn tap_ref_mut<R>(self, func: impl FnOnce(&mut R)) -> Self
where Self: AsMut<R>, R: ?Sized,

Mutable access to the AsMut<R> view of a value. Read more
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fn tap_deref<T>(self, func: impl FnOnce(&T)) -> Self
where Self: Deref<Target = T>, T: ?Sized,

Immutable access to the Deref::Target of a value. Read more
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fn tap_deref_mut<T>(self, func: impl FnOnce(&mut T)) -> Self
where Self: DerefMut<Target = T> + Deref, T: ?Sized,

Mutable access to the Deref::Target of a value. Read more
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fn tap_dbg(self, func: impl FnOnce(&Self)) -> Self

Calls .tap() only in debug builds, and is erased in release builds.
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fn tap_mut_dbg(self, func: impl FnOnce(&mut Self)) -> Self

Calls .tap_mut() only in debug builds, and is erased in release builds.
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fn tap_borrow_dbg<B>(self, func: impl FnOnce(&B)) -> Self
where Self: Borrow<B>, B: ?Sized,

Calls .tap_borrow() only in debug builds, and is erased in release builds.
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fn tap_borrow_mut_dbg<B>(self, func: impl FnOnce(&mut B)) -> Self
where Self: BorrowMut<B>, B: ?Sized,

Calls .tap_borrow_mut() only in debug builds, and is erased in release builds.
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fn tap_ref_dbg<R>(self, func: impl FnOnce(&R)) -> Self
where Self: AsRef<R>, R: ?Sized,

Calls .tap_ref() only in debug builds, and is erased in release builds.
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fn tap_ref_mut_dbg<R>(self, func: impl FnOnce(&mut R)) -> Self
where Self: AsMut<R>, R: ?Sized,

Calls .tap_ref_mut() only in debug builds, and is erased in release builds.
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fn tap_deref_dbg<T>(self, func: impl FnOnce(&T)) -> Self
where Self: Deref<Target = T>, T: ?Sized,

Calls .tap_deref() only in debug builds, and is erased in release builds.
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fn tap_deref_mut_dbg<T>(self, func: impl FnOnce(&mut T)) -> Self
where Self: DerefMut<Target = T> + Deref, T: ?Sized,

Calls .tap_deref_mut() only in debug builds, and is erased in release builds.
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T> TryClone for T
where T: Clone,

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fn try_clone(&self) -> Result<T, Error>

Clones self, possibly returning an error.
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impl<T> TryConv for T

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fn try_conv<T>(self) -> Result<T, Self::Error>
where Self: TryInto<T>,

Attempts to convert self into T using TryInto<T>. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T

Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 824 bytes