SignalService

struct SignalProof {
  struct BlockHeader header;
  bytes proof;
}

error B_ZERO_SIGNAL()

error B_NULL_APP_ADDR()

error B_WRONG_CHAIN_ID()

function init(address _addressManager) external

Initializer to be called after being deployed behind a proxy.

function sendSignal(bytes32 signal) public returns (bytes32 storageSlot)

Send a signal by storing the key with a value of 1.

Name	Type	Description
signal	bytes32	The signal to send.

Name	Type	Description
storageSlot	bytes32	The slot in storage that this signal is persisted.

function isSignalSent(address app, bytes32 signal) public view returns (bool)

Check if a signal has been sent (key stored with a value of 1).

Name	Type	Description
app	address	The address that sent this message.
signal	bytes32	The signal to check.

function isSignalReceived(uint256 srcChainId, address app, bytes32 signal, bytes proof) public view returns (bool)

Check if signal has been received on the destination chain (current).

Name	Type	Description
srcChainId	uint256	The source chain ID.
app	address	The address that sent this message.
signal	bytes32	The signal to check.
proof	bytes	The proof of the signal being sent on the source chain.

function getSignalSlot(address app, bytes32 signal) public pure returns (bytes32 signalSlot)

Name	Type	Description
app	address	The srcAddress of the app (eg. the Bridge).
signal	bytes32	The signal to store.

Name	Type	Description
signalSlot	bytes32	The storage key for the signal on the signal service.