SubstrateBridgeOutboundChannel

---

Calls

---

update_interval

Attributes

Name	Type
new_interval	T::BlockNumber

Python

call = substrate.compose_call(
    'SubstrateBridgeOutboundChannel', 'update_interval', {'new_interval': 'u32'}
)

---

Events

---

IntervalUpdated

Attributes

Name	Type	Composition
interval	T::BlockNumber	u32

---

MessageAccepted

Attributes

Name	Type	Composition
network_id	SubNetworkId	('Mainnet', 'Kusama', 'Polkadot', 'Rococo', 'Alphanet', 'Liberland')
batch_nonce	u64	u64
message_nonce	MessageNonce	u64

---

Storage functions

---

ChannelNonces

Python

result = substrate.query(
    'SubstrateBridgeOutboundChannel', 'ChannelNonces', [
    (
        'Mainnet',
        'Kusama',
        'Polkadot',
        'Rococo',
        'Alphanet',
        'Liberland',
    ),
]
)

Return value

'u64'

---

Interval

Interval between committing messages.

Python

result = substrate.query(
    'SubstrateBridgeOutboundChannel', 'Interval', []
)

Return value

'u32'

---

LatestCommitment

Python

result = substrate.query(
    'SubstrateBridgeOutboundChannel', 'LatestCommitment', [
    (
        'Mainnet',
        'Kusama',
        'Polkadot',
        'Rococo',
        'Alphanet',
        'Liberland',
    ),
]
)

Return value

{
    'block_number': 'u32',
    'commitment': {
        'EVM': {
            'messages': [
                {
                    'max_gas': 'scale_info::111',
                    'payload': 'Bytes',
                    'target': '[u8; 20]',
                },
            ],
            'nonce': 'u64',
            'total_max_gas': 'scale_info::111',
        },
        'Sub': {
            'messages': [{'payload': 'Bytes', 'timepoint': 'scale_info::291'}],
            'nonce': 'u64',
        },
    },
}

---

MessageQueues

Messages waiting to be committed. To update the queue, use append_message_queue and take_message_queue methods (to keep correct value in [QueuesTotalGas]).

Python

result = substrate.query(
    'SubstrateBridgeOutboundChannel', 'MessageQueues', [
    (
        'Mainnet',
        'Kusama',
        'Polkadot',
        'Rococo',
        'Alphanet',
        'Liberland',
    ),
]
)

Return value

[
    {
        'payload': 'Bytes',
        'timepoint': {
            'EVM': 'u64',
            'Parachain': 'u32',
            'Pending': None,
            'Sora': 'u32',
            'Unknown': None,
        },
    },
]

---

Constants

---

ThisNetworkId

Value

{'Sub': 'Kusama'}

Python

constant = substrate.get_constant('SubstrateBridgeOutboundChannel', 'ThisNetworkId')

---

Errors

---

ChannelExists

This channel already exists

---

MaxGasTooBig

Maximum gas for queued batch exceeds limit.

---

NoFunds

Cannot pay the fee to submit a message.

---

Overflow

Cannot increment nonce

---

PayloadTooLarge

The message payload exceeds byte limit.

---

QueueSizeLimitReached

No more messages can be queued for the channel during this commit cycle.

---

ZeroInterval

Interval cannot be zero.

---