Trait sp_core::offchain::Externalities
source · pub trait Externalities: Send {
// Required methods
fn is_validator(&self) -> bool;
fn network_state(&self) -> Result<OpaqueNetworkState, ()>;
fn timestamp(&mut self) -> Timestamp;
fn sleep_until(&mut self, deadline: Timestamp);
fn random_seed(&mut self) -> [u8; 32];
fn set_authorized_nodes(
&mut self,
nodes: Vec<OpaquePeerId>,
authorized_only: bool,
);
}Expand description
An extended externalities for offchain workers.
Required Methods§
sourcefn is_validator(&self) -> bool
fn is_validator(&self) -> bool
Returns if the local node is a potential validator.
Even if this function returns true, it does not mean that any keys are configured
and that the validator is registered in the chain.
sourcefn network_state(&self) -> Result<OpaqueNetworkState, ()>
fn network_state(&self) -> Result<OpaqueNetworkState, ()>
Returns information about the local node’s network state.
sourcefn sleep_until(&mut self, deadline: Timestamp)
fn sleep_until(&mut self, deadline: Timestamp)
Pause the execution until deadline is reached.
sourcefn random_seed(&mut self) -> [u8; 32]
fn random_seed(&mut self) -> [u8; 32]
Returns a random seed.
This is a truly random non deterministic seed generated by host environment. Obviously fine in the off-chain worker context.
Set the authorized nodes from runtime.
In a permissioned network, the connections between nodes need to reach a consensus between participants.
nodes: a set of nodes which are allowed to connect for the local node. each one is identified with anOpaquePeerId, here it just use plain bytes without any encoding. InvalidOpaquePeerIds are silently ignored.authorized_only: if true, only the authorized nodes are allowed to connect, otherwise unauthorized nodes can also be connected through other mechanism.