Commit Graph

34 Commits

Author SHA1 Message Date
Jim Posen
1328e61c00 htlcswitch: Change circuit map keys to (channel ID, HTLC ID).
This changes the circuit map internals and API to reference circuits
by a primary key of (channel ID, HTLC ID) instead of paymnet
hash. This is because each circuit has a unique offered HTLC, but
there may be multiple circuits for a payment hash with different
source or destination channels.
2017-12-14 17:53:58 -08:00
Jim Posen
bc8d674958 htlcswitch: Remove constructor functions for htlcPacket.
The constructor functions have no additional logic other than passing
function parameters into struct fields. Given the large function
signatures, it is more clear to directly construct the htlcPacket in
client code than call a function with lots of positional arguments.
2017-12-14 17:53:58 -08:00
Olaoluwa Osuntokun
8a7085f8b4
htlcswitch: ensure we don't dispatch local HTLC's to link that aren't eligible to forward
This commit fixes an existing bug wherein we would incorrectly attempt
to forward and HTLC to a link that wasn’t yet eligible for forwarding.
This would occur when we’ve added a link to the switch, but haven’t yet
received a FundingLocked message for the channel. As a result, the
channel won’t have the next revocation point available. A logic error
prior to this commit would skip tallying the largest bandwidth rather
than skipping examining the link all together.

Fixes #464.
2017-12-07 19:03:27 -08:00
Olaoluwa Osuntokun
be1a96b78a
htlcswitch: ensure links are eligible to forward when selecting outgoing links
In this commit, when selecting a candidate link to forward a payment,
we’ll ensure that it’s actually able to take on the HTLC. Otherwise,
we’ll skip over the link itself. Currently, a link is only fully
eligible for forwarding, *after* we’ve received and fully processed the
FundingLocked message.
2017-12-06 16:42:58 -08:00
Olaoluwa Osuntokun
5a51600f95
htlcswitch: update CloseLink to accept ideal fee rate 2017-11-23 23:10:12 -06:00
Olaoluwa Osuntokun
70ed50738a
htlcswitch: utilize memoryMailBox within link, no longer spawn goroutine to forward in switch
In this commit, we’ve modified the link and the switch to start to use
the new mailBox in place of the existing synchronous message send
directly into the link’s upstream/downstream channels. With his change,
we no longer need to spawn a new goroutine each time an HTLC needs to
be forwarded, or a user payment is initiated.
2017-11-10 19:51:02 -08:00
Andrey Samokhvalov
3555c4c463 htlcswitch: fix clean of channel link 2017-11-09 16:38:57 -08:00
Andrey Samokhvalov
291232f0c3 htlcswicth: fix deadlock
After addition of the channel reestablish message exchange we couldn't
use the Bandwidth() function, at least in the test framework.
2017-11-09 16:38:57 -08:00
Andrey Samokhvalov
d70ffe93e4 htlcswitch+channel: add channel states synchronization
In this commit BOLT№2 retranmission logic for the channel link have
been added. Now if channel link have been initialised with the
'SyncState' field than it will send the lnwire.ChannelReestablish
message and will be waiting for receiving the same message from remote
side. Exchange of this message allow both sides understand which
updates they should exchange with each other in order sync their
states.
2017-11-09 16:38:57 -08:00
Andrey Samokhvalov
bea9c0b52b htlcswitch: make stop of the link not in the goroutine
In order to be able to properly restart switch several times we should
have the sequential process of channel link stop. In other words if we
stopped the switch we should be sure that all channel links have been
stopped too. Addition of the goroutine during the force close was added
because of the deadlock:

Trace:
1. link:force_close_notification
2. link:wipe_channel
3. peer:switch_remove_link
4. switch:stop_link
5. link:wait <-- deadlock
2017-11-09 16:38:57 -08:00
Olaoluwa Osuntokun
65c03c98d0
htlcswitch: always return an instance of ForwardingError from handleLocalDispatch
This commit modifies the errors that we return within the
handleLocalDispatch method. Rather than returning a regular error, or
simply the matching error code in some instances, we now _always_
return an instance of ForwardingError. This will allow the router to
make more intelligent decisions w.r.t routing HTLC’s as with this
information it will now be able to differentiate errors that occur
within the switch (before sending out the HTLC), from errors that occur
within the HTLC route itself.
2017-10-16 18:42:16 -07:00
Olaoluwa Osuntokun
61be23dc31
htlcswitch+server: add new field SelfKey to htlcswitch.Config
This commit adds a new field to the switch’s Config, namely the public
key of the backing lightning node. This field will soon be used to
return more detailed errors messages back to the ChannelRouter itself.
2017-10-16 18:39:17 -07:00
Olaoluwa Osuntokun
12ae63101d
Htlcswitch: rename Deobfuscator and Obfuscator interfaces
This commit renames the Deobfuscator interface to ErrorDecrypter and
the Obfuscator interface to ErrorEncrypter. With this rename, the
purpose of these two interfaces are a bit clearer.

Additionally, DecryptError (which was formerly Deobfuscate) now
directly returns an ForwardingError type instead of the
lnwire.FailureMessage.
2017-10-10 22:19:19 -07:00
Olaoluwa Osuntokun
30906b1a1a
htlcswitch: within handleLocalDispatch bubble up the decode error 2017-10-02 22:14:15 -07:00
Olaoluwa Osuntokun
7038842f03
htlcswitch: in local outgoing payment attempt print a nicer error if no bandwidth
This commit modifies the error we return to the end user in the case of
an insufficient link capacity error when handling a local payment
dispatch. Previously we would return a
lnwire.CodeTemporaryChannelFailure, however, this isn’t necessary as
this is a local payment attempt and we don’t give up any sensitive
information by returning the best available bandwidth, and what we need
to complete the payment.
2017-10-02 22:14:14 -07:00
John Griffith
54c4fc4559 htlcswitch+server: pass onion error to ChannelRouter 2017-10-02 22:12:50 -07:00
Olaoluwa Osuntokun
7ae436e30e
htlcswitch+test: send switch back error on lnwallet.ErrInsufficientBalance
This commit fixes a bug related to swallowing an error that should go
to the switch in the case of an insufficient balance error when
attempting to add a new HTLC to the channel state machine. In this
case, an error would never be returned back to the client/switch, and
the internal processing within the channelLink would loop forever,
attempting to add an HTLC that can’t be added due to insufficient
balance to state machine itself.

We fix this issue by only treating the lnwallet.ErrMaxHTLCNumber as the
only error that prompts adding an HTLC to the overflow queue rather
than sending the error directly back to the switch.
2017-09-25 16:10:20 -07:00
Olaoluwa Osuntokun
3d95efdc0f
htlcswitch: use %x when printing the payment hash of an HTLC
We use %x as it’ll hex-encode the raw bytes, instead of printing the
individual integers within the byte array.
2017-09-12 18:08:50 +02:00
Olaoluwa Osuntokun
2d45552ad9
htlcswitch: properly format chan_id on failure to find 2017-08-22 20:12:56 -07:00
Olaoluwa Osuntokun
4d92d23762
htlcswitch: add new UpdateForwardingPolicies method
This commit adds a new method to the HtlcSwitch:
UpdateForwardingPolicies. With this method callers are now able to
modify the forwarding policies of all, or some currently active links.
We also make a slight modification to the way that forwarding policy
updates are handled within the links themselves to ensure that we don’t
override with a zero value for any of the fields.
2017-08-22 00:53:18 -07:00
Olaoluwa Osuntokun
8a51b1a0c6
Htlcswitch: switch all accounting and forwarding decisions to use mSAT's 2017-08-22 00:53:04 -07:00
Olaoluwa Osuntokun
0d4ee08372
htlcswitch: asynchronously handle channel close requests
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.
2017-08-03 16:59:16 -07:00
Steven Roose
09719626e5 htlcswitch: Fix typo in logging
Because the .String() method of an amount already includes a unit string
("BTC" usually), it was printing "0.00000001 BTC satoshi".
2017-07-31 21:45:15 -07:00
Olaoluwa Osuntokun
402112e6ee
htlcswitch: update tests utilities to be aware of new commitment design 2017-07-30 17:51:20 -07:00
Olaoluwa Osuntokun
a04fa76a4c
lnwire+htlcswitch: minor grammatical, formatting fixes after error PR 2017-07-14 20:08:37 -07:00
Andrey Samokhvalov
79b8d26b1a htlcswitch+router+server: handle payment error topology updates
In previous commits we have intoduced the onion errors. Some of this
errors include lnwire.ChannelUpdate message. In order to change
topology accordingly to the received error, from nodes where failure
have occured, we have to propogate the update to the router subsystem.
2017-07-14 19:08:04 -07:00
Andrey Samokhvalov
2d378b3280 htlcswitch+router: add onion error obfuscation
Within the network, it's important that when an HTLC forwarding failure
occurs, the recipient is notified in a timely manner in order to ensure
that errors are graceful and not unknown. For that reason with
accordance to BOLT №4 onion failure obfuscation have been added.
2017-07-14 19:08:04 -07:00
Olaoluwa Osuntokun
01d54c29af
htlcswitch: restore the ability to properly handle debughtlc recv's
This commit fixes a regression introduce in the prior commit which
added full verification of the per-hop payloads to the ChannelLink
interface. When this was initially implemented, the added checks
weren’t guarded on the existence of debughtlc’s. As a result,
debughtlc’s would be rejected as they don’t match the expected invoice
value.

This commit fixes that issue by only checking the hop payload if debug
HTLC mode isn’t on.
2017-07-04 15:58:23 -07:00
Olaoluwa Osuntokun
0fc62f123d
htlcswitch: log regular channel ID when registering channels 2017-06-19 16:39:45 +02:00
Olaoluwa Osuntokun
4b0e331c62
htlcswitch: fix linter issues 2017-06-17 01:04:21 +02:00
Olaoluwa Osuntokun
1f5a4fcb8e
htlcswitch: change over all internal indexes to use short channel ID's 2017-06-16 23:49:46 +02:00
Olaoluwa Osuntokun
74897dc328
htlcswitch: fix linter error 2017-05-31 16:48:12 -07:00
Olaoluwa Osuntokun
048e4c0a39
htlcswitch: fix issues with forwarding stats logger display
This commit fixes some issues in the display of the stats logger which
resulted in: stats being printed even though no forwarding activity
took place, and underflow of integers resulting in weird outputs when
forwarding.

This commit also adds some additional comments and renames the main
forwarding goroutine to its former name.
2017-05-31 16:16:58 -07:00
Andrey Samokhvalov
b86409cdb3 htlcswitch: recreate hlcswitch from scratch
This commit gives the start for making the htlc manager and htlc switch
testable. The testability of htlc switch have been achieved by mocking
all external subsystems. The concrete list of updates:

1. create standalone package for htlc switch.
2. add "ChannelLink" interface, which represent the previous htlc link.
3. add "Peer" interface, which represent the remote node inside our
subsystem.
4. add htlc switch config to htlc switch susbystem, which stores the
handlers which are not elongs to any of the above interfaces.

With this commit we are able test htlc switch even without having
the concrete implementation of Peer, ChannelLink structures, they will
be added later.
2017-05-31 11:06:08 -07:00