This commit modifies the way the nodes spun up the by test framework
are created such that they don’t use the configuration parameters
storage in the normal lnd home directory. Otherwise, tests would pick
up the configuration of the user’s pre-existing lnd nodes.
This commit adds the +build !rpctest build flag to the test files in
the main package other than the RPC tests. With this, if the protest
build flag is set, then ONLY those tests will be run.
This commit fixes an existing bug that would cause a force closed
channel to stay pending forever. In this instance, if one force closes
a channel while they have a dust output, and restart before the channel
is fully closed, then it wouldn’t have been closed automatically
(within the database) by the autopilot agent.
This commit adds a new file to the repo: pilot.go. This files contains
the items necessary to configure, and initialize an instance of
autopilot.Agent with the passed configuration struct.
This commit introduces the initial implementation of the autopilot
mode. Autopilot is new mode within lnd that enables automatic channel
management. This means that if enabled lnd will attempt to
automatically manage channels according to a set of heuristic defined
within the main configuration for autopilot.Agent instance.
The autopilot.Agent implements a simple closed control loop. It takes
in external signals such as wallet balance updates, new open channel,
and channels that are now closed the updates its internal state. With
each external trigger it will consult the registered
AttachmentHeuristic to decide: if it needs to open any more channels,
and if so how much it should use to open the channels, ultimately
returning a set of recommended AttachmentDirectives. The
autopilot.Agent loop will then take those attempt to establish
connection, and go back in waiting for a new external signal.
With this first implementation the default heuristic is the
ConstrainedPrefAttachment implementation of AttachmentHeuristic. Given
a min and max channel size, a limit on the number of channels, and the
percentage of wallet funds to allocate to channels, it will attempt to
execute a heuristic drive by the Barabási–Albert model model in order
to attempt to drive the global graph towards a scale free topology.
This is commit implements a foundational layer for future simulations,
optimization, and additional heuristics.
This commit fixes a bug which was covered by the recent server
refactoring wherein the grouting would be stuck on the send over the
message channel in the case that the handshake failed. This blockage
would create a deadlock now that the ConnectToPeer method is full
synchronous.
We fix this issue by ensuring the goroutine properly exits.
This commit updates the integration tests to reflect the reality after
removing code that would always attempt to increment the current update
timestamp by one for each channel announcement. Without connecting
directly to carol, it isn’t guaranteed that Alice will receive that
announcement as Bob would have already processed one for Carol when
their channel was created.
This commit fixes an issue where if a party force closing a channel,
doesn’t have a non-dust balance, nor any outgoing HTLC’s, then the
channel would never be marked as fully closed within the database.
We ensure that this case is addressed, by inserting a checking to
determine if we have any funds to sweep, marking the channel fully
closed on initial commitment transaction confirmation if not.
This commit modifies how the htlcswitch handles close requests.
Previously it could be the case that a new channel was added, but at
the same time a channel was requested to be closed. This would result
in a circular waiting dependency: the peer contacts the switch, who
tries to contact the peer.
We eliminate this possibility by ensuring that the switch handles all
close requests asynchronously. With this, the switch won't block
indefinitely in the scenario described above.
This commit ensures that all references within the chanMsgStreams are
all removed and deleted when the readHandler exits. This ensures that
all objects don’t have extra references, and will properly be garbage
collected.
This commit implements a missing policy within the current ChannelLink
interface. If an HTLC arrives that is too close to the current block
height, then we’ll reject it. As otherwise, it may be possible for us
to lose an on-chain claim if they HTLC expires already or expires
before we’re able to get a commitment transaction in the chain.
As the exit node, we have a grace period that governs out decision. As
an intermediate node, we ensure that the HTLC isn’t close to expiry on
our outgoing link end if we forward it.
This commit makes the routing cache invalidation a bit more aggressive.
We now invalidate the cache on each new block as the routes in the
cache are based on the current block height. Using the cached items may
cause our routes to fail due to them having time locks which have
already expired.
This commit implements some missing functionality, namely before all
time locks were calculated off of a base height of 0 essentially.
That’s incorrect as all time locks within HTLC’s would then be already
expired. We remedy this requesting the latest height when creating a
route to ensure that our time locks are set properly.
This commit adds a bit of a guard to a set of RPC calls. If an RPC call
needs to interact with the server but it hasn’t yet been started. Then
we’ll exit early in order to avoid blocking the call until the server
itself has started.
A recent change to the initialization order of sub-systems within lnd
results in a state where the daemon will wait for the wallet itself to
finish syncing _before_ the server is started. This was interpreted as
a bug by some users, so we’ll make the state of the server more
explicit by returning an error.
This commit adds a new utility method to the server struct itself. This
method will allow callers to query the state of the server in order to
decide if the server has been started or not. This can be useful
elsewhere in the project as we start to decouple the lifetime of
certain sub-systems from others.
This commit modifies the NewBrontideMachine constructor to allow a
caller to specify exactly _how_ new ephemeral private keys for the
crypto handshake are generated. This allows callers a bit more
flexibility when using brontide, and also allow test cases to insert
specific public keys for use within the hand shake.
This commit temporary increases the timeout for the
TestChannelLinkBidirectionalOneHopPayments test in order to account for
the slowness of the travis instances that our tests are run on.
This commit fixes a bug that existed in the prior scheme we used to
synchronize between the funding manager and the peer’s readHandler.
Previously, it was possible for messages to be re-ordered before the
reached the target ChannelLink. This would result in commitment
failures as the state machine assumes a strict in-order message
delivery. This would be manifested due to the goroutine that was
launched in the case of a pending channel funding.
The new approach using the chanMsgStream is much simpler, and easier to
read. It should also be a bit snappier, as we’ll no longer at times
create a goroutine for each message.
This commit ensures that we always clean up the resources that are
created when a new instance of a lnwallet.LightningChannel is
instantiated. The is necessary due to the sigPool that’s now present as
an internal goroutine.
Note that this commit is temporary, and should be reverted once #231 is
merged. The reason we need to do this for now, is that we don’t
properly track the exact state of the remote party’s commitment. In
this test case, the resulting HTLC’s added are dust to one party, but
non-dust to another. So upon restart, the states (balance wise) has
diverged.
This commit fixes a lingering bug in the way the internal channel state
machine handled fee calculation. Previously, we would count the dust
HTLC’s that were trimmed towards the fee that the initiator paid. This
is invalid as otherwise, the initiator would always benefit from dust
HTLC’s. Instead, we now simply “donate” the dust HTLC’s to the miner in
the commitment transaction. This change puts us in compliance with
BOLT-0003.
This commit modifies the CommitSpendNoDelay script witness generation
function. We must modify this function as all non-delayed outputs now
also require a key derivation. The current default
signer.ComputeInputScript implementation is unable to directly look up
the public key required as it attempt to target the pub key using the
pkScript.
This commit adds a new command line option that allows clients to
specify a default value to use when responding to a new channel funding
request. In a future change, a pure mapping will be added, with the
command line option having higher precedence.
This commit adds a new responsibility to the breach arbiter: the
service is now responsible for sweeping the commitment outputs to-self,
in the case of a unilateral commitment broadcast by the remote party.
In this new commitment design, this output won’t be immediately
recognized by the wallet due to using a tweaked public key. As a
result, we need to sweep this output into the wallet manually.
This commit modifies the closeObserver code to populate the signDesc in
the case we have a non-trimmed balance. Additionally, we now also add a
*wire.OutPoint field to the struct in order to allow receivers of the
message to construct a witness that can spend the newly created output
to their wallet.
This commit updates the main single-funder funding workflow within the
fundingManager (initiated via the rpcserver or by a message from a
connected peer) to fully adhere to the funding protocol outlined in
BOLT-0002.
The major changes are as follows:
* All messages modified to use the new funding messages in BOLT-0002.
* The initiator of a funding workflow no longer decides how many
confirmations must elapse before the channel can be considered open.
* Rather than each side specifying their desired CSV delay, both
sides now specify the CSV delay for the _other_ party.
This commit removes the num_confs parameter within the
OpenChannelRequest struct as it’s no longer applicable with the new
funding workflow. In the new funding workflow, it’s the responder that
decides how many confirmations are required.
This commit modifies the channel close negotiation workflow to instead
take not of the fat that with the new funding workflow, the delivery
scripts are no longer pre-committed to at the start of the funding
workflow. Instead, both sides present their delivery addresses at the
start of the shutdown process, then use those to create the final
cooperative closure transaction.
To accommodate for this new change, we now have an intermediate staging
area where we store the delivery scripts for both sides.
This commit modifies the TestChannelLinkBidirectionalOneHopPayments
test to ensure that each payment sent is safely above the dust
threshold. Note that the dust threshold itself is now higher due to the
existence of the HTLC covenant transactions which the HTLC values
themselves must cover.
This change ensure that this test operates under “normal” operation
conditions in order to catch any bugs introduced during a major change.
We can safely remove the initial revocation window extension as this
has gone away with the new state machine. We instead now just fill the
window once the channel has been opened, and then maintain a fixed
window size of 2 from there on.
This commit modifies the methods that transition the state of the
channel into an active closing state. With the new commitment design,
the delivery scripts are no longer pre-committed to the initial funding
messages. Instead, the scripts are sent at the instant that either side
decides to shutdown within the Shutdown message.
This commit adds a new companion struct: OutgoingHtlcResolution to the
commitment state machine. The purpose of this struct is the provide the
caller with the information necessary to sweep all outgoing HTLC’s in
the case of a broadcast up-to-date commitment transaction.
The HTLC resolutions allow a caller to sweep an outgoing HTLC into
their wallet after the absolute timeout of the HTLc has passed. This is
a two step process, with the first portion consisting of broadcasting
the HTLC timeout transaction itself, and the second portion consisting
of claiming the HTLC itself after a CSV delay.
This commit adds awareness of active HTLC outputs to the
BreachRetribution struct. Previously, in the case of a breach, the
struct was only populated with enough information to sweep the two
commitment outputs. With this commit, the struct now has enough
information to sweep _all_ outputs within the commitment transaction.
Olaoluwa Osuntokun