Preimage¶

Calls¶

note_preimage¶

See [Pallet::note_preimage].

Attributes¶

Name	Type
bytes	`Vec<u8>`

Python¶

call = substrate.compose_call(
    'Preimage', 'note_preimage', {'bytes': 'Bytes'}
)

request_preimage¶

See [Pallet::request_preimage].

Attributes¶

Name	Type
hash	`T::Hash`

Python¶

call = substrate.compose_call(
    'Preimage', 'request_preimage', {'hash': 'scale_info::12'}
)

unnote_preimage¶

See [Pallet::unnote_preimage].

Attributes¶

Name	Type
hash	`T::Hash`

Python¶

call = substrate.compose_call(
    'Preimage', 'unnote_preimage', {'hash': 'scale_info::12'}
)

unrequest_preimage¶

See [Pallet::unrequest_preimage].

Attributes¶

Name	Type
hash	`T::Hash`

Python¶

call = substrate.compose_call(
    'Preimage', 'unrequest_preimage', {'hash': 'scale_info::12'}
)

Events¶

Cleared¶

A preimage has ben cleared.

Attributes¶

Name	Type	Composition
hash	`T::Hash`	`scale_info::12`

Noted¶

A preimage has been noted.

Attributes¶

Name	Type	Composition
hash	`T::Hash`	`scale_info::12`

Requested¶

A preimage has been requested.

Attributes¶

Name	Type	Composition
hash	`T::Hash`	`scale_info::12`

Storage functions¶

PreimageFor¶

Python¶

result = substrate.query(
    'Preimage', 'PreimageFor', [('scale_info::12', 'u32')]
)

Return value¶

'Bytes'

StatusFor¶

The request status of a given hash.

Python¶

result = substrate.query(
    'Preimage', 'StatusFor', ['scale_info::12']
)

Return value¶

{
    'Requested': {
        'count': 'u32',
        'deposit': (None, ('[u8; 20]', 'u128')),
        'len': (None, 'u32'),
    },
    'Unrequested': {'deposit': ('[u8; 20]', 'u128'), 'len': 'u32'},
}

Errors¶

AlreadyNoted¶

Preimage has already been noted on-chain.

NotAuthorized¶

The user is not authorized to perform this action.

NotNoted¶

The preimage cannot be removed since it has not yet been noted.

NotRequested¶

The preimage request cannot be removed since no outstanding requests exist.

Requested¶

A preimage may not be removed when there are outstanding requests.

TooBig¶

Preimage is too large to store on-chain.