SignalService

SignalProof

struct SignalProof {
  struct BlockHeader header;
  bytes proof;
}

B_ZERO_SIGNAL

error B_ZERO_SIGNAL()

B_NULL_APP_ADDR

error B_NULL_APP_ADDR()

B_WRONG_CHAIN_ID

error B_WRONG_CHAIN_ID()

init

function init(address _addressManager) external

Initializer to be called after being deployed behind a proxy.

sendSignal

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

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

Parameters

Name	Type	Description
signal	bytes32	The signal to send.

Return Values

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

isSignalSent

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

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

Parameters

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

isSignalReceived

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).

Parameters

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.

getSignalSlot

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

Parameters

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

Return Values

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