lightning-listpeers – Command returning data on connected lightning nodes

SYNOPSIS

listpeers [id] [level]

DESCRIPTION

The listpeers RPC command returns data on nodes that are connected or are not connected but have open channels with this node.

Once a connection to another lightning node has been established, using the connect command, data on the node can be returned using listpeers and the id that was used with the connect command.

If no id is supplied, then data on all lightning nodes that are connected, or not connected but have open channels with this node, are returned.

Supplying id will filter the results to only return data on a node with a matching id, if one exists.

Supplying level will show log entries related to that peer at the given log level. Valid log levels are “io”, “debug”, “info”, and “unusual”.

If a channel is open with a node and the connection has been lost, then the node will still appear in the output of the command and the value of the connected attribute of the node will be “false”.

The channel will remain open for a set blocktime, after which if the connection has not been re-established, the channel will close and the node will no longer appear in the command output.

RETURN VALUE

On success, an object with a “peers” key is returned containing a list of 0 or more objects.

Each object in the list contains the following data:

  • id : The unique id of the peer
  • connected : A boolean value showing the connection status
  • netaddr : A list of network addresses the node is listening on
  • features : Bit flags showing supported features (BOLT #9)
  • channels : An array of objects describing channels with the peer.
  • log : Only present if level is set. List logs related to the peer at the specified level

If id is supplied and no matching nodes are found, a “peers” object with an empty list is returned.

The objects in the channels array will have at least these fields:

  • state: Any of these strings:
    • "OPENINGD": The channel funding protocol with the peer is ongoing and both sides are negotiating parameters.
    • "CHANNELD_AWAITING_LOCKIN": The peer and you have agreed on channel parameters and are just waiting for the channel funding transaction to be confirmed deeply. Both you and the peer must acknowledge the channel funding transaction to be confirmed deeply before entering the next state.
    • "CHANNELD_NORMAL": The channel can be used for normal payments.
    • "CHANNELD_SHUTTING_DOWN": A mutual close was requested (by you or peer) and both of you are waiting for HTLCs in-flight to be either failed or succeeded. The channel can no longer be used for normal payments and forwarding. Mutual close will proceed only once all HTLCs in the channel have either been fulfilled or failed.
    • "CLOSINGD_SIGEXCHANGE": You and the peer are negotiating the mutual close onchain fee.
    • "CLOSINGD_COMPLETE": You and the peer have agreed on the mutual close onchain fee and are awaiting the mutual close getting confirmed deeply.
    • "AWAITING_UNILATERAL": You initiated a unilateral close, and are now waiting for the peer-selected unilateral close timeout to complete.
    • "FUNDING_SPEND_SEEN": You saw the funding transaction getting spent (usually the peer initiated a unilateral close) and will now determine what exactly happened (i.e. if it was a theft attempt).
    • "ONCHAIN": You saw the funding transaction getting spent and now know what happened (i.e. if it was a proper unilateral close by the peer, or a theft attempt).
    • "CLOSED": The channel closure has been confirmed deeply. The channel will eventually be removed from this array.
  • status: An array of strings containing the most important log messages relevant to this channel. Also known as the “billboard”.
  • owner: A string describing which particular sub-daemon of lightningd currently is responsible for this channel. One of: "lightning_openingd", "lightning_channeld", "lightning_closingd", "lightning_onchaind".
  • to_us_msat: A string describing how much of the funds is owned by us; a number followed by a string unit.
  • total_msat: A string describing the total capacity of the channel; a number followed by a string unit.

These fields may exist if the channel has gotten beyond the "OPENINGD" state, or in various circumstances:

  • short_channel_id: A string of the short channel ID for the channel; Format is "BBBBxTTTxOOO", where "BBBB" is the numeric block height at which the funding transaction was confirmed, "TTT" is the numeric funding transaction index within that block, and "OOO" is the numeric output index of the transaction output that actually anchors this channel.
  • direction: The channel-direction we own, as per BOLT #7. We own channel-direction 0 if our node ID is “less than” the peer node ID in a lexicographical ordering of our node IDs, otherwise we own channel-direction 1. Our channel_update will use this direction.
  • channel_id: The full channel ID of the channel; the funding transaction ID XORed with the output number.
  • funding_txid: The funding transaction ID of the channel.
  • close_to: The raw scriptPubKey that was indicated in the starting fundchannel_start command and accepted by the peer. If the scriptPubKey encodes a standardized address, an additional close_to_addr field will be present with the standardized address.
  • private: A boolean, true if the channel is unpublished, false if the channel is published.
  • funding_msat: An object, whose field names are the node IDs involved in the channel, and whose values are strings (numbers with a unit suffix) indicating how much that node originally contributed in opening the channel.
  • min_to_us_msat: A string describing the historic point at which we owned the least amount of funds in this channel; a number followed by a string unit. If the peer were to succesfully steal from us, this is the amount we would still retain.
  • max_to_us_msat: A string describing the historic point at which we owned the most amount of funds in this channel; a number followed by a string unit. If we were to successfully steal from the peer, this is the amount we could potentially get.
  • dust_limit_msat: A string describing an amount; if an HTLC or the amount wholly-owned by one node is at or below this amount, it will be considered “dusty” and will not appear in a close transaction, and will be donated to miners as fee; a number followed by a string unit.
  • max_total_htlc_in_msat: A string describing an amount; the sum of all HTLCs in the channel cannot exceed this amount; a number followed by a string unit.
  • their_reserve_msat: A string describing the minimum amount that the peer must keep in the channel when it attempts to send out; if it has less than this in the channel, it cannot send to us on that channel; a number followed by a string unit. We impose this on them, default is 1% of the total channel capacity.
  • our_reserve_msat: A string describing the minimum amount that you must keep in the channel when you attempt to send out; if you have less than this in the channel, you cannot send out via this channel; a number followed by a string unit. The peer imposes this on us, default is 1% of the total channel capacity.
  • spendable_msat and receivable_msat: A string describing an estimate of how much we can send or receive over this channel in a single payment (or payment-part for multi-part payments); a number followed by a string unit. This is an estimate, which can be wrong because adding HTLCs requires an increase in fees paid to onchain miners, and onchain fees change dynamically according to onchain activity. For a sufficiently-large channel, this can be limited by the rules imposed under certain blockchains; for example, individual Bitcoin mainnet payment-parts cannot exceed 42.94967295 mBTC.
  • minimum_htlc_in_msat: A string describing the minimum amount that an HTLC must have before we accept it.
  • their_to_self_delay: The number of blocks that the peer must wait to claim their funds, if they close unilaterally.
  • our_to_self_delay: The number of blocks that you must wait to claim your funds, if you close unilaterally.
  • max_accepted_htlcs: The maximum number of HTLCs you will accept on this channel.
  • in_payments_offered: The number of incoming HTLCs offered over this channel.
  • in_offered_msat: A string describing the total amount of all incoming HTLCs offered over this channel; a number followed by a string unit.
  • in_payments_fulfilled: The number of incoming HTLCs offered and successfully claimed over this channel.
  • in_fulfilled_msat: A string describing the total amount of all incoming HTLCs offered and successfully claimed over this channel; a number followed by a string unit.
  • out_payments_offered: The number of outgoing HTLCs offered over this channel.
  • out_offered_msat: A string describing the total amount of all outgoing HTLCs offered over this channel; a number followed by a string unit.
  • out_payments_fulfilled: The number of outgoing HTLCs offered and successfully claimed over this channel.
  • out_fulfilled_msat: A string describing the total amount of all outgoing HTLCs offered and successfully claimed over this channel; a number followed by a string unit.
  • htlcs: An array of objects describing the HTLCs currently in-flight in the channel.

Objects in the htlcs array will contain these fields:

  • direction: Either the string "out" or "in", whether it is an outgoing or incoming HTLC.
  • id: A numeric ID uniquely identifying this HTLC.
  • amount_msat: The value of the HTLC.
  • expiry: The blockheight at which the HTLC will be forced to return to its offerer: an "in" HTLC will be returned to the peer, an "out" HTLC will be returned to you. NOTE If the expiry of any outgoing HTLC will arrive in the next block, lightningd(8) will automatically unilaterally close the channel in order to enforce the timeout onchain.
  • payment_hash: The payment hash, whose preimage must be revealed to successfully claim this HTLC.
  • state: A string describing whether the HTLC has been communicated to or from the peer, whether it has been signed in a new commitment, whether the previous commitment (that does not contain it) has been revoked, as well as when the HTLC is fulfilled or failed offchain.
  • local_trimmed: A boolean, existing and true if the HTLC is not actually instantiated as an output (i.e. “trimmed”) on the commitment transaction (and will not be instantiated on a unilateral close). Generally true if the HTLC is below the dust_limit_msat for the channel.

On error the returned object will contain code and message properties, with code being one of the following:

  • -32602: If the given parameters are wrong.

AUTHOR

Michael Hawkins <michael.hawkins@protonmail.com>.

SEE ALSO

lightning-connect(7), lightning-fundchannel_start(7)