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Trait polkadot_node_subsystem::ChainApiBackend

source · 
pub trait ChainApiBackend: Send + Sync {
    // Required methods
    fn header<'life0, 'async_trait>(
        &'life0 self,
        hash: H256,
    ) -> Pin<Box<dyn Future<Output = Result<Option<Header<u32, BlakeTwo256>>, Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             Self: 'async_trait;
    fn info<'life0, 'async_trait>(
        &'life0 self,
    ) -> Pin<Box<dyn Future<Output = Result<Info<Block<Header<u32, BlakeTwo256>, OpaqueExtrinsic>>, Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             Self: 'async_trait;
    fn number<'life0, 'async_trait>(
        &'life0 self,
        hash: H256,
    ) -> Pin<Box<dyn Future<Output = Result<Option<<Header<u32, BlakeTwo256> as Header>::Number>, Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             Self: 'async_trait;
    fn hash<'life0, 'async_trait>(
        &'life0 self,
        number: <<Block<Header<u32, BlakeTwo256>, OpaqueExtrinsic> as Block>::Header as Header>::Number,
    ) -> Pin<Box<dyn Future<Output = Result<Option<H256>, Error>> + Send + 'async_trait>>
       where 'life0: 'async_trait,
             Self: 'async_trait;
}
Expand description

Offers header utilities.

This is a async wrapper trait for [‘HeaderBackend’] to be used with the ChainApiSubsystem.

Required Methods§

source

fn header<'life0, 'async_trait>( &'life0 self, hash: H256, ) -> Pin<Box<dyn Future<Output = Result<Option<Header<u32, BlakeTwo256>>, Error>> + Send + 'async_trait>>
where 'life0: 'async_trait, Self: 'async_trait,

Get block header. Returns None if block is not found.

source

fn info<'life0, 'async_trait>( &'life0 self, ) -> Pin<Box<dyn Future<Output = Result<Info<Block<Header<u32, BlakeTwo256>, OpaqueExtrinsic>>, Error>> + Send + 'async_trait>>
where 'life0: 'async_trait, Self: 'async_trait,

Get blockchain info.

source

fn number<'life0, 'async_trait>( &'life0 self, hash: H256, ) -> Pin<Box<dyn Future<Output = Result<Option<<Header<u32, BlakeTwo256> as Header>::Number>, Error>> + Send + 'async_trait>>
where 'life0: 'async_trait, Self: 'async_trait,

Get block number by hash. Returns None if the header is not in the chain.

source

fn hash<'life0, 'async_trait>( &'life0 self, number: <<Block<Header<u32, BlakeTwo256>, OpaqueExtrinsic> as Block>::Header as Header>::Number, ) -> Pin<Box<dyn Future<Output = Result<Option<H256>, Error>> + Send + 'async_trait>>
where 'life0: 'async_trait, Self: 'async_trait,

Get block hash by number. Returns None if the header is not in the chain.

Implementors§