Trait polkadot_service::AuxStore
source · pub trait AuxStore {
// Required methods
fn insert_aux<'a, 'b, 'c, I, D>(
&self,
insert: I,
delete: D,
) -> Result<(), Error>
where 'b: 'a,
'c: 'a,
I: IntoIterator<Item = &'a (&'c [u8], &'c [u8])>,
D: IntoIterator<Item = &'a &'b [u8]>;
fn get_aux(&self, key: &[u8]) -> Result<Option<Vec<u8>>, Error>;
}
Expand description
Provides access to an auxiliary database.
This is a simple global database not aware of forks. Can be used for storing auxiliary information like total block weight/difficulty for fork resolution purposes as a common use case.
Required Methods§
sourcefn insert_aux<'a, 'b, 'c, I, D>(
&self,
insert: I,
delete: D,
) -> Result<(), Error>where
'b: 'a,
'c: 'a,
I: IntoIterator<Item = &'a (&'c [u8], &'c [u8])>,
D: IntoIterator<Item = &'a &'b [u8]>,
fn insert_aux<'a, 'b, 'c, I, D>(
&self,
insert: I,
delete: D,
) -> Result<(), Error>where
'b: 'a,
'c: 'a,
I: IntoIterator<Item = &'a (&'c [u8], &'c [u8])>,
D: IntoIterator<Item = &'a &'b [u8]>,
Insert auxiliary data into key-value store.
Deletions occur after insertions.
Object Safety§
This trait is not object safe.
Implementations on Foreign Types§
source§impl<B, E, Block, RA> AuxStore for &Client<B, E, Block, RA>where
B: Backend<Block>,
E: CallExecutor<Block>,
Block: Block,
Client<B, E, Block, RA>: ProvideRuntimeApi<Block>,
<Client<B, E, Block, RA> as ProvideRuntimeApi<Block>>::Api: Core<Block>,
impl<B, E, Block, RA> AuxStore for &Client<B, E, Block, RA>where
B: Backend<Block>,
E: CallExecutor<Block>,
Block: Block,
Client<B, E, Block, RA>: ProvideRuntimeApi<Block>,
<Client<B, E, Block, RA> as ProvideRuntimeApi<Block>>::Api: Core<Block>,
source§impl<B, E, Block, RA> AuxStore for Client<B, E, Block, RA>where
B: Backend<Block>,
E: CallExecutor<Block>,
Block: Block,
Client<B, E, Block, RA>: ProvideRuntimeApi<Block>,
<Client<B, E, Block, RA> as ProvideRuntimeApi<Block>>::Api: Core<Block>,
impl<B, E, Block, RA> AuxStore for Client<B, E, Block, RA>where
B: Backend<Block>,
E: CallExecutor<Block>,
Block: Block,
Client<B, E, Block, RA>: ProvideRuntimeApi<Block>,
<Client<B, E, Block, RA> as ProvideRuntimeApi<Block>>::Api: Core<Block>,
source§fn insert_aux<'a, 'b, 'c, I, D>(
&self,
insert: I,
delete: D,
) -> Result<(), Error>where
'b: 'a,
'c: 'a,
I: IntoIterator<Item = &'a (&'c [u8], &'c [u8])>,
D: IntoIterator<Item = &'a &'b [u8]>,
fn insert_aux<'a, 'b, 'c, I, D>(
&self,
insert: I,
delete: D,
) -> Result<(), Error>where
'b: 'a,
'c: 'a,
I: IntoIterator<Item = &'a (&'c [u8], &'c [u8])>,
D: IntoIterator<Item = &'a &'b [u8]>,
Insert auxiliary data into key-value store.