Channel Close Handshake

The channel close handshake involves two steps: init and confirm.

Table of Contents

• Channel Close Init
• Channel Close Confirm

Channel Close Init

Use the chan-close-init command to initialize the closure of a channel.

DESCRIPTION:
Initiate the closing of a channel (ChannelCloseInit)

USAGE:
    hermes tx chan-close-init --dst-chain <DST_CHAIN_ID> --src-chain <SRC_CHAIN_ID> --dst-connection <DST_CONNECTION_ID> --dst-port <DST_PORT_ID> --src-port <SRC_PORT_ID> --dst-channel <DST_CHANNEL_ID> --src-channel <SRC_CHANNEL_ID>

OPTIONS:
    -h, --help    Print help information

REQUIRED:
        --dst-chain <DST_CHAIN_ID>
            Identifier of the destination chain

        --dst-channel <DST_CHANNEL_ID>
            Identifier of the destination channel (required) [aliases: dst-chan]

        --dst-connection <DST_CONNECTION_ID>
            Identifier of the destination connection [aliases: dst-conn]

        --dst-port <DST_PORT_ID>
            Identifier of the destination port

        --src-chain <SRC_CHAIN_ID>
            Identifier of the source chain

        --src-channel <SRC_CHANNEL_ID>
            Identifier of the source channel (required) [aliases: src-chan]

        --src-port <SRC_PORT_ID>
            Identifier of the source port

Example

hermes tx chan-close-init --dst-chain ibc-0 --src-chain ibc-1 --dst-connection connection-0 --dst-port transfer --src-port transfer --dst-channel channel-0 --src-channel channel-1

Success: CloseInitChannel(
    CloseInit(
        Attributes {
            height: Height {
                revision: 0,
                height: 77,
            },
            port_id: PortId(
                "transfer",
            ),
            channel_id: Some(
                ChannelId(
                    "channel-0",
                ),
            ),
            connection_id: ConnectionId(
                "connection-0",
            ),
            counterparty_port_id: PortId(
                "transfer",
            ),
            counterparty_channel_id: Some(
                ChannelId(
                    "channel-1",
                ),
            ),
        },
    ),
)

Channel Close Confirm

Use the chan-close-confirm command to confirm the closure of a channel.

DESCRIPTION:
Confirm the closing of a channel (ChannelCloseConfirm)

USAGE:
    hermes tx chan-close-confirm --dst-chain <DST_CHAIN_ID> --src-chain <SRC_CHAIN_ID> --dst-connection <DST_CONNECTION_ID> --dst-port <DST_PORT_ID> --src-port <SRC_PORT_ID> --dst-channel <DST_CHANNEL_ID> --src-channel <SRC_CHANNEL_ID>

OPTIONS:
    -h, --help    Print help information

REQUIRED:
        --dst-chain <DST_CHAIN_ID>
            Identifier of the destination chain

        --dst-channel <DST_CHANNEL_ID>
            Identifier of the destination channel (required) [aliases: dst-chan]

        --dst-connection <DST_CONNECTION_ID>
            Identifier of the destination connection [aliases: dst-conn]

        --dst-port <DST_PORT_ID>
            Identifier of the destination port

        --src-chain <SRC_CHAIN_ID>
            Identifier of the source chain

        --src-channel <SRC_CHANNEL_ID>
            Identifier of the source channel (required) [aliases: src-chan]

        --src-port <SRC_PORT_ID>
            Identifier of the source port

Example

hermes tx chan-close-confirm --dst-chain ibc-1 --src-chain ibc-0 --dst-connection connection-1 --dst-port transfer --src-port transfer --dst-channel channel-1 --src-channel channel-0

Success: CloseConfirmChannel(
    CloseConfirm(
        Attributes {
            height: Height {
                revision: 1,
                height: 551,
            },
            port_id: PortId(
                "transfer",
            ),
            channel_id: Some(
                ChannelId(
                    "channel-1",
                ),
            ),
            connection_id: ConnectionId(
                "connection-1",
            ),
            counterparty_port_id: PortId(
                "transfer",
            ),
            counterparty_channel_id: Some(
                ChannelId(
                    "channel-0",
                ),
            ),
        },
    ),
)

NOTE: The cosmos-sdk transfer module implementation does not allow the user (hermes in this case) to initiate the closing of channels. Therefore, when using the Gaia release image, the chan-close-init command fails as the MsgChannelCloseInit message included in the transaction is rejected. To be able to test channel closure, you need to patch your gaia deployments.