Commit Graph

211 Commits

Author SHA1 Message Date
Olaoluwa Osuntokun
a2545d85dc
peer: ensure goroutine launched during initial handshake exits
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.
2017-08-10 18:07:54 -07:00
Conner Fromknecht
efd9cf12b8 peer: adds tracking of go routines to sync disconnect
In addition to improved synchronization between the client
  and server, this commit also moves the channel snapshotting
  procedure such that it is handled without submitting a query
  to the primary select statement. This is primarily done as a
  precaution to ensure that no deadlocks occur, has channel
  snapshotting has the potential to block restarts.
2017-08-10 16:14:01 -07:00
Olaoluwa Osuntokun
43b736225b
multi: add new method to generate fresh node announcments 2017-08-04 18:32:33 -07:00
Olaoluwa Osuntokun
c183e8984c
peer: properly clean up chanMsgStreams map on readHandler exit
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.
2017-08-03 13:52:12 -07:00
Olaoluwa Osuntokun
36f4e2046d
peer: ensure mutex is freed up when the msgConsumer exits 2017-08-03 13:50:34 -07:00
Olaoluwa Osuntokun
79e68a2fdf
peer: properly initialize ChannelLink with new block+height info 2017-08-02 21:15:57 -07:00
Olaoluwa Osuntokun
0377a4f99d
peer: ensure the chanMsgStream for a channel exists on peer d/c 2017-07-31 21:31:24 -07:00
Olaoluwa Osuntokun
c47408119e
peer: abandon the prior activeChanStreams scheme in favor of chanMsgStream
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.
2017-07-31 21:25:54 -07:00
Olaoluwa Osuntokun
5e4b368348
peer: introduce chanMsgStream to provide a concurrent safe, in-order stream of msgs 2017-07-31 21:20:42 -07:00
Olaoluwa Osuntokun
f963859524
funding+peer: rename processFundingResponse to processFundingAccept 2017-07-31 21:04:58 -07:00
Olaoluwa Osuntokun
cd7b3290a8
peer: modify channel closing negotiation to create new delivery scripts
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.
2017-07-30 17:51:37 -07:00
Olaoluwa Osuntokun
01fe9adff0
peer: update logWireMessage to account for new lnwire messages 2017-07-30 17:51:34 -07:00
Andrey Samokhvalov
6bbb7cbfc3 lnd: hook up encrypted onion error scaffolding
In this commit daemon have been changed to set the proper hooks in the
channel link and switch subsystems so that they could send and receive
encrypted onion errors.
2017-07-14 19:08:04 -07:00
Andrey Samokhvalov
ef73062c14 peer+server+htlcswitch: add reason to disconnnect function
In order to recognize exact reason of the disconnect the additional
field have been added in the disconnect function.
2017-07-14 19:08:04 -07:00
Johan T. Halseth
adbbd1e80f peer: handle received update_fee message. 2017-07-14 16:39:15 -07:00
Olaoluwa Osuntokun
e15604f7b5
peer: ensure latest version of htlcswitch.Peer interface is implemented 2017-06-17 00:11:10 +02:00
Olaoluwa Osuntokun
d202b730eb
peer: fix peer API usage due to incomplete cherry-pick 2017-06-05 19:41:18 -07:00
Olaoluwa Osuntokun
25dc294cf0
server: all references to primary interfaces are now through chainControl 2017-06-05 18:53:37 -07:00
Andrey Samokhvalov
c4955258f1 htlcswicth: start use htlcswitch and channel link inside lnd
In current commit big shift have been made in direction of unit testable
payments scenarios. Previosly two additional structures have been added
which had been spreaded in the lnd package before, and now we apply
them in the lnd itself:

1. ChannelLink - is an interface which represents the subsystem for
managing the incoming htlc requests, applying the changes to the
channel, and also propagating/forwarding it to htlc switch.

2. Switch - is a central messaging bus for all incoming/outgoing htlc's.
The goal of the switch is forward the incoming/outgoing htlc messages
from one channel to another, and also propagate the settle/fail htlc
messages back to original requester.

With this abtractions the folowing schema becomes nearly complete:

abstraction
    ^
    |
    | - - - - - - - - - - - - Lightning - - - - - - - - - - - - -
    |
    | (Switch)		        (Switch)		  (Switch)
    |  Alice <-- channel link --> Bob <-- channel link --> Carol
    |
    | - - - - - - - - - - - - - TCP - - - - - - - - - - - - - - -
    |
    |  (Peer) 		        (Peer)	                  (Peer)
    |  Alice <----- tcp conn --> Bob <---- tcp conn -----> Carol
2017-05-31 11:06:08 -07:00
Olaoluwa Osuntokun
311495e6d0
peer: add additional comments around new channel close workflow, minor fixes
This commit adds a set of additional comments around the new channel
closure workflow and also includes two minor fixes:
  * The error when parsing a signature previously wasn’t checked and is
    now.
  * As a result, we should only track the new signature iff it parses
    correctly and we agree to the details as specified w.r.t to the fee
    for the final closing transaction.

Additionally, as set of TODO’s has been added detailing the additional
work that needs to be done before the closing workflow is fully
compliant with the specification.
2017-05-23 15:26:50 -07:00
Olaoluwa Osuntokun
e635b958a5
peer: consolidate sendClosingSigned into shutdown resp flow 2017-05-23 15:23:06 -07:00
Olaoluwa Osuntokun
588a606a56
peer: ensure when closing the channel actually exists 2017-05-23 15:22:06 -07:00
bryanvu
408be356fb lnwallet: update channel close to use fee estimation interface
This commit switches the channel close workflow to use the lnwallet fee
estimation interface rather than the hardcoded proposedFee.
2017-05-23 14:31:20 -07:00
bryanvu
514760f529 peer: handling for channel shutdown messages
This commit changes the cooperative channel close workflow to comply
with the latest spec. This adds steps to handle and send shutdown
messages as well as moving responsibility for sending the channel close
message from the initiator to the responder.
2017-05-23 14:31:20 -07:00
bryanvu
d7bb600c23 lnwire: adjusted coop close messages to comply with spec
Removed close_request and close_complete and replaced with shutdown and
closing_signed.
2017-05-23 14:31:20 -07:00
Olaoluwa Osuntokun
e7420edd44 peer: fix last-mile settle stalling in concurrent multi-hop setting
This commit fixes an issue that would at times cause the htlcManager
which manages the link that’s the final hop to settle in an HTLC flow.
Previously, a case would arise wherein a set of HTLC’s were settled to,
but not properly committed to in the commitment transaction of the
remote node. This wasn’t an issue with HTLC’s which were added but
uncleared, as that batch was tracked independently.

In order to fix this issue, we now track pending HTLC settles
independently. This is a temporary fix, as has been noted in a TODO
within this commit.
2017-05-18 20:19:03 -07:00
Olaoluwa Osuntokun
041f3f1e98 peer: eliminate possibility of concurrent map writes in htlcManager
This commit fixed an issue in the htlcManager goroutine which manages
channel state updates. Due to lack of a mutex protecting the two maps
written in the goroutine launched to forward HTLC’s to the switch.

This issue was detected by golang’s runtime which is able to detect
invalid concurrent map writes.
2017-05-18 20:13:33 -07:00
bryanvu
abe2e502d5 lnwallet: add FeeEstimator interface, StaticFeeEstimator implementation
This commit adds the FeeEstimator interface, which can be used for
future fee calculation implementations. Currently, there is only the
StaticFeeEstimator implementation, which returns the same fee rate for
any transaction.
2017-05-15 20:26:11 -07:00
Olaoluwa Osuntokun
3b61675344
peer: revert 178f26b8d5ef14b437b9d8d1755bd238212b4dec
This commit reverts a prior commit
178f26b8d5ef14b437b9d8d1755bd238212b4dec that introduced a scenario
that could cause a state desynchronization and/or a few extraneous
commitment updates. To avoid such cases, the commitment tick timer is
now only started after _receiving_ a commitment update.
2017-05-15 18:20:56 -07:00
Olaoluwa Osuntokun
620695542c
peer: fix panic bug in watiForChanToClose
This commit fixes a panic bug in the watiForChanToClose method caused
by a logic error leading to the return value of the function at times
being a nil pointer in the case that an error occurred. We now avoid
such an error by _always_ returning from the function if there’s an
error, but conditionally (in a diff if-clause) sending an error over
the error channel.
2017-05-15 18:20:52 -07:00
Olaoluwa Osuntokun
34959e4648
peer+lnwallet: update API usage to recent channeldb changes 2017-05-14 19:23:57 -07:00
Olaoluwa Osuntokun
7df1d75267
peer: stop a channel's goroutines within wipeChannel 2017-05-14 19:21:23 -07:00
Olaoluwa Osuntokun
e05ec619ca
peer: ensure no messages are sent/processed _before_ all channels loaded
This commit fixes a bug which could at times cause channels to be
unusable upon connection. The bug would manifest like the following:
two peers would connect, one loads their channels faster than the
other, this would result in the winning peer attempting to extend their
revocation window. However, if the other peer hadn’t yet loaded the
channel, then this would appear to them to be an unknown channel.

We properly fix this issue by ensure all channels are loaded _before_
any of the goroutines needed for the operation of the peer are
launched.
2017-05-11 15:21:00 -07:00
Olaoluwa Osuntokun
d47f004fbd
peer+rpcserver+breacharbiter: usel latest ChainNotifier API 2017-05-11 15:20:55 -07:00
Olaoluwa Osuntokun
071aa3ad75
peer: log which channel point when revocation window exhausted 2017-05-04 17:39:42 -07:00
Olaoluwa Osuntokun
62d6ac6a8f
peer: properly manage channel close lifecycle within the database
Within this commit the peer will now properly manage the channel close
life cycle within the database. This entails marking the channel as
pending closed either once the closing transaction has been broadcast
or the close request message has been sent to the other side.

Once the closing transaction has been confirmed, the transaction will
be marked as fully closed within the database. A helper function has
been added to factor out “waiting for a transaction to confirm” when
handling moth local and remote cooperative closure flows.

Finally, we no longer delete the channel state within wipeChannel as
this will now be managed distinctly by callers.
2017-05-04 17:39:40 -07:00
Olaoluwa Osuntokun
4cb76071a2
server+peer: re-write persistent connection handling
The prior methods we employed to handle persistent connections could
result in the following situation: both peers come up, and
_concurrently_ establish connection to each other. With the prior
logic, at this point, both connections would be terminated as each peer
would go to kill the connection of the other peer. In order to resolve
this issue in this commit, we’ve re-written the way we handle
persistent connections.

The eliminate the issue described above, in the case of concurrent peer
connection, we now use a deterministic method to decide _which_
connection should be closed. The following rule governs which
connection should be closed: the connection of the peer with the
“smaller” public key should be closed. With this rule we now avoid the
issue described above.

Additionally, each peer now gains a peerTerminationWatcher which waits
until a peer has been disconnected, and then cleans up all resources
allocated to the peer, notifies relevant sub-systems of its demise, and
finally handles re-connecting to the peer if it's persistent. This
replaces the goroutine that was spawned in the old version of
peer.Disconnect().
2017-04-23 19:58:03 -07:00
Olaoluwa Osuntokun
00a7f140ff
peer: add WaitForDisconnect method
This commit adds a new method to the peer struct: WaitForDisconnect().
This method is put in place to be used by wallers to synchronize the
ending of a peer’s lifetime. A follow up commit will utilize this new
method to re-write the way we handle persistent peer connections.
2017-04-23 19:29:44 -07:00
Olaoluwa Osuntokun
0ef36dca9b
peer: remove the Stop() method in favor of only Disconnect() 2017-04-23 19:25:22 -07:00
Olaoluwa Osuntokun
52ffb026af
peer: return more detailed errors from the Start() method 2017-04-23 19:24:33 -07:00
Olaoluwa Osuntokun
adce64e21c
peer: we now load active channel during startup, not creation 2017-04-23 19:23:22 -07:00
Olaoluwa Osuntokun
010373fe0f
peer: modify readMessage/writeMessage to be message oriented
This commit modifies both readMessage and writeMessage to be further
message oriented. This means that message will be read and written _as
a whole_ rather than piece wise. This also fixes two bugs: the
readHandler could be blocked due to an sync read, and the writeHandler
would unnecessarily chunk up wire messages into distinct crypto
messages rather than writing it in one swoop.

Also with these series of changes, we’re now able to properly parse
messages that have been padded out with additional data as is allowed
by the current specification draft.
2017-04-20 15:45:59 -07:00
Olaoluwa Osuntokun
f867252139
peer: switch to new WriteMessage/ReadMessage after wire msg changes 2017-04-19 16:23:22 -07:00
Olaoluwa Osuntokun
feec611531
lnwire+peer: implement new ping/pong messages and behavior
This commit implements the new ping/pong messages along with their new
behavior. The new set of ping/pong messages allow clients to generate
fake cover traffic as the ping messages tells the pong message how many
bytes to included and can also be padded itself.
2017-04-16 18:11:45 -07:00
Olaoluwa Osuntokun
193936374a
peer: fix deadlock bug, block readHandler when waiting for chan open
This commit fixes a deadlock bug within the readHandler of the peer.
Previously, once a channel was pending opening, _no_ other message
would be processed by the readHandler as it would be blocked waiting
for the channel to open. On testnet this would be manifsted as a node
locking up, until the channel was detected as being open.

We fix this bug by tracking which channel streams are active. If a
channel stream is active, then we can send the update directly to it.
Otherwise, we launch a goroutine that’ll block until the channel is
open, then in a synchronized manner, update the channel stream as being
active and send the update to the channel.
2017-04-16 15:45:24 -07:00
Olaoluwa Osuntokun
60c0cebfd5
lnd: switch over internal indexes to use the new Channel ID's 2017-04-16 15:41:19 -07:00
Olaoluwa Osuntokun
609cba95d7
funding+peer: switch to using new channel ID's
This commit modifies the way the fundingManager tracks pending funding
workflows internally. Rather than using the old auto-incrementing
64-bit pending channel ID’s, we now use a 32-byte pending channel ID
which is generated using a CSPRG. Additionally, once the final funding
message has been sent, we now de-multiplex the FundingLocked message
according to the new Channel ID’s which replace the old ChannelPoint’s
and are exactly 32-bytes long.
2017-04-16 15:34:29 -07:00
Olaoluwa Osuntokun
d146411712
peer: lower logCommitTimer check to 100ms 2017-04-14 11:25:03 -07:00
Olaoluwa Osuntokun
b51a0eb094
peer: increase initial handshake timeout to 15 seconds 2017-04-13 14:48:43 -07:00
Olaoluwa Osuntokun
54c63f4aa1
peer: remove unused lastNMessages map
This map was added very early on as a possible path to implement proper
retransmission. However, we now have a proper persistent retransmission
sub-system being proposed as a PR, therefore we no longer have any use
for this.
2017-04-13 14:32:00 -07:00
Olaoluwa Osuntokun
178f26b8d5
peer: restore the htlcManager's logCommitTimer to a persistent ticker
This commit patches a whole in our optimistic channel synchronization
logic by making the logCommitTimer a persistent ticker rather than one
that is activated after receiving a commitment, and disabled once we
send a new commitment ourself. In the setting of batched full-duplex
channel updates, the prior approach could at times result in a benign
state desync caused by one side being one commitment ahead of the other
because one of the nodes failed to, or was unable to provide the other
with a state update during the workflow.
2017-04-11 22:02:44 -07:00
Olaoluwa Osuntokun
3393f3a8db
peer: simplify channel state update handling by using
This commit simplifies the channel state update handling by doing away
with the commitmentState.pendingUpdate method all together. The newly
added LightningChannel.FullySynced method replace the prior state and
also replaced all other uses of PendingUpdates.

By moving to using channel.FullySynced() we also eliminate class of
desynchronization error caused by a node failing to provide the other
side with the latest commitment state.
2017-04-11 22:02:36 -07:00
Andrey Samokhvalov
d4055d7830 discovery+funding: add validation of the announcement messages
Add validation functions and include validation checks in the
annoncement process function.
2017-03-29 19:49:05 -07:00
Andrey Samokhvalov
fbf766e3c6 discovery+funding: add 'AnnounceSignature' proof exchange
Add the interaction between nodes of announce signature messages, which
will allow us to exhcnage the half channel announcemen proofs later.
2017-03-29 19:49:05 -07:00
Andrey Samokhvalov
c3b2854428 lnwire: converge discovery part of messages with specification
Change the name of fields of messages which are belong to the discovery
subsystem in a such way so they were the same with the names that are
defined in the specification.
2017-03-29 19:49:05 -07:00
Andrey Samokhvalov
4c52b6e6a4 lnd: replace 'routing' with 'discovery' package
Add usage of the 'discovery' package in the lnd, now discovery service
will be handle all lnwire announcement messages and send them to the
remote party.
2017-03-29 19:49:05 -07:00
Olaoluwa Osuntokun
0e96d273d9
peer: enforce strict timeout on opening handshake
This commit modifies the logic around the opening p2p handshake to
enforce a strict timeout around the receipt of the responding init
message. Before this commit, it was possible for the daemon and certain
RPC calls to deadlock as if a peer connected, but didn’t respond with
an init msg, then we’d be sitting there waiting for them to respond.
With this commit, we’ll now time out, kill the connection and then
possible attempt to re-connect if the connection was persistent.
2017-03-29 19:00:40 -07:00
Olaoluwa Osuntokun
505421db2c
htlcswitch: add HTLC overflow flow-control via bounded channels
This commit fixes a prior bug which would cause the set of HTLC’s on a
node’s commitment to potentially overflow if an HTLC was accepted or
attempted to be forwarded that but the commitment transaction over the
maximum allowed HTLC’s on a commitment transaction. This would cause
the HTLC to silently be rejected or cause a connection disconnect. In
either case, this would cause the two states to be desynchronized any
pending HTLC’s to be ignored.

We fix this issue by introducing the concept of a bounded channel,
which is a channel in which the number of items send and recevied over
the channel must be balanced in order to allow a new send to succeed
w/o blocking. We achieve this by using a chan struct{} as a semaphore
and decrement it each time a packet it sent, increasing the semaphore
one a packet is received. This creates a channel that we can use to
ensure the switch never sends more than N HTLC’s to a link before any
of the HTLC’s have been settled.

With this bug fix, it’s now once again possible to trigger sustained
bursts of payments through lnd nodes.
2017-03-24 16:40:02 -07:00
Olaoluwa Osuntokun
ac83b8ae06
peer: fix bug in handshake wherein RevokeAndAck would be sent first
This commit fixes a bug in the opening handshake between to peers. The
bug would arise when on or many channels were active between a node
establishing a new connection. The htlcManager goroutines will
immediately attempt to extend the revocation window once they’re
active. However, at this time, the init message may not yet have been
sent as the two executions are in distinct goroutines.

We fix this bug by manually writing the init message directly to the
socket, rather than traveling through the queueHandler goroutine. With
this, we ensure that the init message is _always_ sent first.
2017-03-16 19:45:16 -07:00
Olaoluwa Osuntokun
f217093c00
multi: replace usage of fastsha256 with crypto/sha256
This commit removes all instances of the fastsha256 library and
replaces it with the sha256 library in the standard library. This
change should see a number of performance improvements as the standard
library has highly optimized assembly instructions with use vectorized
instructions as the platform supports.
2017-03-15 18:56:41 -07:00
Andrey Samokhvalov
143a6e01bb lnd: fix unconvert warnings 2017-03-13 16:30:23 -07:00
Olaoluwa Osuntokun
b5a6098dd5
peer: don't load channels on connect that are still pending
This commit modifies the peer struct’s loadActiveChannels method to
ensure that it skips over channels that aren’t actually active. This
fixes a bug that could possibly cause a peer to get stuck in a circular
wait loop and also de-sync a channel’s state machine.
2017-02-24 16:32:00 -08:00
bryanvu
eb490b8833 lnwire: add FundingLocked message
When the funding transaction has been confirmed, the FundingLocked
message is sent by the peers to each other so that the existence of the
newly funded channel can be announced to the network.

This commit also removes the SingleFundingOpenProof message.
2017-02-24 11:37:33 -08:00
bryanvu
e549a3f0ed fundingmanager: move final funding steps from wallet to funding manager.
Once a channel funding process has advanced to the point of broadcasting
the funding transaction, the state of the channel should be persisted
so that the nodes can disconnect or go down without having to wait for the
funding transaction to be confirmed on the blockchain.

Previously, the finalization of the funding process was handled by a
combination of the funding manager, the peer and the wallet, but if
the remote peer is no longer online or no longer connected, this flow
will no longer work. This commit moves all funding steps following
the transaction broadcast into the funding manager, which is available
as long as the daemon is running.
2017-02-24 11:37:33 -08:00
bryanvu
0dd6cb99c1 fundingmanager: moved channel barriers from peer to funding manager.
Because peers may become disconnected or otherwise unavailable,
the channel barriers must be stored and managed within the fundingmanager.
2017-02-24 11:37:33 -08:00
Olaoluwa Osuntokun
e910b12d33
lnd: fix issues reported by golint+govet
github.com/lightningnetwork/lnd  master ✗

                                           0m ◒
▶ golint
htlcswitch.go:292:4: should replace numUpdates += 1 with numUpdates++
htlcswitch.go:554:6: var onionId should be onionID
htlcswitch.go:629:7: var onionId should be onionID
lnd_test.go:133:1: context.Context should be the first parameter of a
function
lnd_test.go:177:1: context.Context should be the first parameter of a
function
networktest.go:84:2: struct field nodeId should be nodeID
peer.go:1704:16: should omit 2nd value from range; this loop is
equivalent to `for invoice := range ...`
rpcserver.go:57:6: func newRpcServer should be newRPCServer

github.com/lightningnetwork/lnd  master ✗

                                        9m ⚑ ◒  ⍉
▶ go vet
features.go:12: github.com/lightningnetwork/lnd/lnwire.Feature
composite literal uses unkeyed fields
fundingmanager.go:380: no formatting directive in Errorf call
exit status 1
2017-02-22 14:58:37 -08:00
Andrey Samokhvalov
4c4ce93730 peer: fix panic during peer connection 2017-02-22 14:50:48 -08:00
bryanvu
b21bd351e8 fundingmanager: change funding messages to use server.sendToPeer
Previously, during the channel funding process, peers sent wire
messages using peer.queueMsg. By switching to server.sendToPeer, the
fundingManager is more resilient to network connection issues or system
restarts during the funding process. With server.sendToPeer, if a peer
gets disconnected, the daemon can attempt to reconnect and continue the
process using the peer’s public key ID.
2017-02-21 19:21:19 -08:00
Olaoluwa Osuntokun
2dfab8c6d7
routing+lnd: provide payment premiere as response to SendPayment 2017-02-21 01:43:48 -08:00
Olaoluwa Osuntokun
5e216b8bf9
peer: properly use block height when logging channel closure height 2017-02-21 01:43:42 -08:00
Olaoluwa Osuntokun
4a48b91e31
peer: update channel commitment updates to match spec
This commit modifies a peer’s htlcManager goroutine in order to
properly implement the new state machine defined by the specification.
The major change to this new state machine is that we can no longer
have a limited number of unrevoked commitment states. As a result, we
no longer need to track how many outsanding changes we have, and only
need to track if we have a pending change or not. This simplifies the
logic a bit.

Additionally, when receive a new signature we FIRST send an
RevokeAndAck, THEN we if we need to send a signature in response or
not. This is the major change to the state machine from the PoV of the
htlcManager. Previously, the order was flipped.
2017-02-21 01:43:21 -08:00
Andrey Samokhvalov
ae15a193e2 lnwire+features: transition to the user friendly list of features 2017-02-21 01:25:05 -08:00
Andrey Samokhvalov
6ce9ea29da server+peer: add 'init' message support
In this commit the support for global and local feature vectors were
added in 'server' and 'peer' structures respectively. Also with commit
additional logic was added and now node waits to receive 'init'
lnwire.Message before sending/responding on any other messages.
2017-02-17 13:27:29 +08:00
Olaoluwa Osuntokun
906c0451c8
peer: check for existence of channel when handling a remote close
This commit patches a bug in the code for handling a remote cooperative
channel closer. Previous if the region node didn’t know of the channel
which was being requested to close, then a panic would occur as the
entry read from the map would be nil.

To fix this bug, we now ensure that the channel exists before we
perform any actions on it. In a later commit which overhauls the
channel opening and closing to match that of the specification, this
logic will be modified to properly send an error message in response to
the failed channel closure.
2017-02-07 16:49:04 -08:00
Olaoluwa Osuntokun
8c059631df
peer+server: ensure the remote TCP connection is always closed 2017-02-06 15:05:07 -08:00
Olaoluwa Osuntokun
f4b403679b
lnwallet: remove BlockChainIO as a dependency to LightningChannel
This commit removes the BlockChainIO interface as a dependency to the
LightningChannel struct as the interface is no longer used within the
operation of the LightningChannel.
2017-02-02 17:05:40 -08:00
Olaoluwa Osuntokun
4eebc7c994
peer: refactor the queueHandler to aggressively drain queue
This commit refactors the queueHandler slightly to be more aggressive
when attempting to drain the pending message queue.

With this new logic the queueHandler will now attempt to _completely_
drain the pendingMsgs queue by sending it all to the writeHandler
_before_ attempting to accept new messages from the outside
sub-systems. The previous queueHandler was a bit more passive and would
result in messages sitting the the pendingMessage queue longer than
required.
2017-02-01 17:02:03 -08:00
Olaoluwa Osuntokun
6333dfea8f
peer: fix memory alignment for integers used atomically on 32-bit archs
This commit fixes a panic that can occur on 32-bit systems to the
misalignment of a int64/uint64 that’s used atomically using the atomic
package. To fix this issue, we now move all int64/unit64 variables that
are used atomically to the top of the struct in order to ensure
alignment.

Cleaning up some dead-code, satoshisSent/satoshisReceived have been
removed as they aren’t currently used. Instead those values are
accessed directly from the channel themselves.
2017-01-30 00:53:17 -08:00
Olaoluwa Osuntokun
3c5a23b2c1
peer: estimate RTT to peer using the ping and pong messages
This commit enhances the peer struct slightly be attempting to measure
the ping time to the remote node based on when we send a ping message
an dhow long it takes for us to receive a pong response.

The current method used to measure RTT is rather rough and could be
make much more accurate via the usage of an EMA/WMA and also via
attempting to measure processing time within the readMessage and
writeMessage functions.
2017-01-25 18:21:01 -08:00
Olaoluwa Osuntokun
9906e07087
peer: correct logging messages (to:writeMessage, from:readMessage) 2017-01-24 17:49:17 -08:00
Olaoluwa Osuntokun
019edc9035
peer: display the src peer when logging read error 2017-01-23 20:33:29 -08:00
Olaoluwa Osuntokun
97bb8744c4
peer: fix logging message when receiving updates for unknown channel
The previous logging message was broken as that target chanpoint was
being overshadowed by the local variable declaration. The new logging
message will properly print the unknown channel point as well as the
peer who sent the message.
2017-01-22 14:37:08 -08:00
Olaoluwa Osuntokun
8c4b5ae0fc
peer: increase ping interval to 1 minute 2017-01-22 14:35:32 -08:00
Trevin Hofmann
40c7bac3aa multi: fix a variety of typos throughout the repo 2017-01-17 17:02:56 -08:00
Olaoluwa Osuntokun
f82d957c90
lnwire+peer: introduce new error for unknown message type for forward compat
This commit adds a new error type to the `lnwire` package:
`UnknownMessage`. With this error we can catch the particular case of a
an error during reading that encounters a new or unknown message. When
we encounter this message in the peer’s readHandler, we can now
gracefully handle it by just skipping to the next message rather than
closing out the section entirely.

This puts us a bit closer to the spec, but not exactly as it has an
additional constraint that we can only ignore a new message if it has
an odd type. In a future release, we’ll modify this code to match the
spec as written.
2017-01-16 18:03:43 -08:00
Olaoluwa Osuntokun
d884efea29
lnwire+lnd: Make Logging Messages Great Again
This commit modifies the login of sent/recv’d wire messages in trace
mode in order utilize the more detailed, and automatically generated
logging statements using pure spew.Sdump.

In order to avoid the spammy messages due to spew printing the
btcec.S256() curve paramter within wire messages with public keys, we
introduce a new logging function to unset the curve paramter to it
isn’t printed in its entirety. To insure we don’t run into any panics
as a result of a nil pointer defense, we now copy the public keys
during the funding process so we don’t run into a panic due to
modifying a pointer to the same object.
2017-01-14 17:52:18 -08:00
Olaoluwa Osuntokun
8cdb84c619
lnd: add new "perm" bit to the ConnectPeer RPC call
This commit modifies the ConnectPeer RPC call and partitions the
behavior of the call into two scenarios: the connection should be
persistent which causes the call to be non-blocking, and the connection
should only attempt to connect once — which causes the call to be
blocking and report any error back to the caller.

As a result, the pendingConnRequest map and the logic around it is no
longer needed.
2017-01-09 19:09:03 -08:00
Olaoluwa Osuntokun
6bd0e068c6
peer+htlcswitch: add support for multi-hop HTLC error propagation
This commit adds a critical capability to the daemon: proper handling
of error cases that occur during the dispatch and forwarding of
multi-hop payments.

The following errors are now properly handled within the daemon:
    * unknown payment hash
    * unknown destination
    * incorrect HTLC amount
    * insufficient link capacity

In response to any of these errors, an lnwire.CanceHTLC message will be
back propagated from the spot of the error back to the source of the
payment. In the case of a locally initiated HTLC payment, the error
will be propagated back to the client which initiated the payment.

At this point, proper encrypted error replies as defined within the
spec are not yet implemented and will be fully implemented within a
follow up PR.
2017-01-07 21:22:17 -08:00
Olaoluwa Osuntokun
594dc1b163
lnd: switch to the version of the connmgr in roasbeef's fork 2017-01-05 13:58:11 -08:00
Olaoluwa Osuntokun
5affed38fc
multi: update btcsuite API's to latest upstream changes
This commit makes a large number of minor changes concerning API usage
within the deamon to match the latest version on the upstream btcsuite
libraries.

The major changes are the switch from wire.ShaHash to chainhash.Hash,
and that wire.NewMsgTx() now takes a paramter indicating the version of
the transaction to be created.
2017-01-05 13:56:34 -08:00
Olaoluwa Osuntokun
b991cd3d78
multi: allow force channel closures while not connected to peer
This commit adds a much needed feature to the daemon, namely the
ability to force close a channel while the source daemon doesn’t have
an active connection to the counter party. Previously this wasn’t
possible as ALL channel closures were routed through the htlcSwitch
which is only able to trigger a channel closure if the peer is online.

To remedy this, if the closure type is “force” then, we now handle the
channel closure and related RPC streaming updates from the call handler
site of the RPC itself. As a result, there are now only two htlcSwitch
channel closure types: breach, and regular. The logic that’s now in the
rpcSever should likely be refactored into a distinct sub-system, but
getting the initial functionality in is important.

Finally, the channel breach integration test has been modified to skip
connection the peers before attempting the forceful channel closure of
a revoked state as the remote peer no longer needs to be online.
2017-01-03 16:04:47 -08:00
Olaoluwa Osuntokun
3e1c98f2f7
breacharbiter: accept handoff for live channel on peer connect
This commit modifies the interaction between the breachArbiter and the
peer struct such that the breachArbiter _always_ has the latest version
of a contract.

Prior to this commit once we connected out to a peer which we had an
active contract with and the breachArbiter was watching, we’d have two
copies of the channel in memory, instead of just a single one. This was
wasteful and caused some duplicated log messages due to two instances
of the channel being active.
2016-12-27 16:45:05 -08:00
Olaoluwa Osuntokun
c965eda29e
lnd: fully integrate the ChannelRouter of the new routing package
This commit fully integrates the ChannelRouter of the new routing
package into the main lnd daemon.

A number of changes have been made to properly support the new
authenticated gossiping scheme.

Two new messages have been added to the server which allow outside
services to: send a message to all peers possible excluding one, and
send a series of messages to a single peer. These two new capabilities
are used by the ChannelRouter to gossip new accepted announcements and
also to synchronize graph state with a new peer on initial connect.

The switch no longer needs a pointer to the routing state machine as it
no longer needs to report when channels closed since the channel
closures will be detected by the ChannelRouter during graph pruning
when a new block comes in.

Finally, the funding manager now crafts the proper authenticated
announcement to send to the ChannelRouter once a new channel has bene
fully confirmed. As a place holder we have fake signatures everywhere
since we don’t properly store the funding keys and haven’t yet adapted
the Signer interface (or create a new one) that abstracts out the
process of signing a generic interface.
2016-12-27 16:44:31 -08:00
Olaoluwa Osuntokun
326c62c6b5
peer: ensure queueMsg won't create deadlock if peer shutting down
This commit adds some additional measures to ensure that a call to
queueMsg while the peer is shutting down won’t result in a potential
deadlock.

Currently, during shutdown the outgoingQueue channel is attempted to be
cleared by he writeHandler, however adding an additional select
statement serves as a mother layer of defense from nasty dead locks.
2016-12-27 16:43:14 -08:00
Olaoluwa Osuntokun
bd89a9312d
lnd: switch to using the connmgr for listening and persistent conns
This commit revamps the way in bound and outbound connections are
handled within lnd. Instead of manually managing listening goroutines
and also outbound connections, all the duty is now assigned to the
connmgr, a new btcsuite package.

The connmgr now handles accepting inbound (brontide) connections and
communicates with the server to hand off new connections via a
callback. Additionally, any outbound connection attempt is now made
persistent by default, with the assumption that (for right now),
connections are only to be made to peers we wish to make connections
to. Finally, on start-up we now attempt to connection to all/any of our
direct channel counter parties in order to promote the availability of
our channels to the daemon itself and any RPC users.
2016-12-14 18:15:55 -08:00
Olaoluwa Osuntokun
89326423dc
peer+htlcswitch: fix bandwidth update bug when using --debughtlc
This commit fixes a htlcSwitch bandwidth update bug that would manifest
when two sending daemons were started with the —debughtlc flag. The
invoice created for the debug HTLC has a value of 1000BTC. As a result
regardless of the amount sent, the switch’s state which be updated to
reflect that the daemon had just received a 1000BTC transfer.

To fix this bug, we now use the value of the HTLC itself for the
update, rather than the value if the invoice as they should match.
2016-12-14 18:04:13 -08:00
Andrey Samokhvalov
d01f1b5ff4 fundingmanager+lnwallet: add HTLC dust limit logic 2016-12-13 11:01:57 -08:00
Andrey Samokhvalov
5a82240c6a lnwire+lnwallet+fundingmanager: general improvements 2016-12-13 11:01:57 -08:00
Olaoluwa Osuntokun
494fcec874
breacharbiter: introduce new sub-system to watch for breaches
This commit introduces a new sub-system into the daemon whose job it is
to vigilantly watch for any potential channel breaches throughout the
up-time of the daemon. The logic which was moved from the utxoNursery
in a prior commit now resides within the breachArbiter.

Upon start-up the breachArbiter will query the database for all active
channels, launching a goroutine for each channel in order to be able to
take action if a channel breach is detected. The breachArbiter is also
responsible for notifying the htlcSwitch about channel breaches in
order to black-list the breached linked during any multi-hop forwarding
decisions.
2016-11-28 19:44:09 -08:00
Olaoluwa Osuntokun
93cbfdbd60
htlcswitch: add new CloseType enum to account for all closure types 2016-11-28 18:44:22 -08:00