15b871de36
This introduces the a store for managing all things alias-related.
There are two maps:
* baseToSet:
This stores the "base" short channel id as the key. The value is
the set of all aliases issued for this channel. The "base" SCID is
whatever is stored in the OpenChannel's ShortChannelID member. For
everything other than zero-conf channels, this is the confirmed SCID.
For zero-conf channels, this is the very first alias assigned. This is
used mostly by the Switch to retrieve a set of aliases and determine
if it is safe to forward.
* aliasToBase:
This stores the reverse mapping of baseToSet. Each key is an alias
SCID and the value is the "base" SCID. This is exclusively used by
the gossiper to determine if an alias in a ChannelUpdate our peer
sends actually references a channel we know of.
The functions make use of the above two maps:
* AddLocalAlias:
This persists the {alias, base} pair in the database. The baseToSet
map is populated. The aliasToBase is optionally populated depending on
where this function is called from. Upgrade cases, where the
scid-alias feature bit is toggled and channels already exist, will
not persist to the gossip map. This is mainly to simplify the tangle
of logic that would otherwise occur.
* GetAliases:
This fetches the set of aliases by using the passed-in base SCID. This
is used in the Switch and other places where the alias set is needed.
* FindBaseSCID:
This fetches the base given an alias. This is used in the gossiper to
determine validity of a peer's ChannelUpdate that contains an alias.
* DeleteSixConfs:
This removes the aliasToBase map entry for the given "base". This is
used when the gossiper mappings are no longer needed, i.e. when the
channel has six confirmations and is public.
* PutPeerAlias:
Stores the peer's alias.
* GetPeerAlias:
Fetches the peer's alias.
* RequestAlias:
Generates an alias for us in the range 16000000:0:0 and
16250000:16777215:65535
Lightning Network Daemon
The Lightning Network Daemon (lnd) - is a complete implementation of a
Lightning Network node. lnd has several pluggable back-end
chain services including btcd (a
full-node), bitcoind, and
neutrino (a new experimental light client). The project's codebase uses the
btcsuite set of Bitcoin libraries, and also
exports a large set of isolated re-usable Lightning Network related libraries
within it. In the current state lnd is capable of:
- Creating channels.
- Closing channels.
- Completely managing all channel states (including the exceptional ones!).
- Maintaining a fully authenticated+validated channel graph.
- Performing path finding within the network, passively forwarding incoming payments.
- Sending outgoing onion-encrypted payments through the network.
- Updating advertised fee schedules.
- Automatic channel management (
autopilot).
Lightning Network Specification Compliance
lnd fully conforms to the Lightning Network specification
(BOLTs). BOLT stands for:
Basis of Lightning Technology. The specifications are currently being drafted
by several groups of implementers based around the world including the
developers of lnd. The set of specification documents as well as our
implementation of the specification are still a work-in-progress. With that
said, the current status of lnd's BOLT compliance is:
- BOLT 1: Base Protocol
- BOLT 2: Peer Protocol for Channel Management
- BOLT 3: Bitcoin Transaction and Script Formats
- BOLT 4: Onion Routing Protocol
- BOLT 5: Recommendations for On-chain Transaction Handling
- BOLT 7: P2P Node and Channel Discovery
- BOLT 8: Encrypted and Authenticated Transport
- BOLT 9: Assigned Feature Flags
- BOLT 10: DNS Bootstrap and Assisted Node Location
- BOLT 11: Invoice Protocol for Lightning Payments
Developer Resources
The daemon has been designed to be as developer friendly as possible in order
to facilitate application development on top of lnd. Two primary RPC
interfaces are exported: an HTTP REST API, and a gRPC
service. The exported API's are not yet stable, so be warned: they may change
drastically in the near future.
An automatically generated set of documentation for the RPC APIs can be found at api.lightning.community. A set of developer resources including guides, articles, example applications and community resources can be found at: docs.lightning.engineering.
Finally, we also have an active
Slack where protocol developers, application developers, testers and users gather to
discuss various aspects of lnd and also Lightning in general.
Installation
In order to build from source, please see the installation instructions.
Docker
To run lnd from Docker, please see the main Docker instructions
IRC
- irc.libera.chat
- channel #lnd
- webchat
Safety
When operating a mainnet lnd node, please refer to our operational safety
guidelines. It is important to note that lnd is still
beta software and that ignoring these operational guidelines can lead to
loss of funds.
Security
The developers of lnd take security very seriously. The disclosure of
security vulnerabilities helps us secure the health of lnd, privacy of our
users, and also the health of the Lightning Network as a whole. If you find
any issues regarding security or privacy, please disclose the information
responsibly by sending an email to security at lightning dot engineering,
preferably encrypted using our designated PGP key
(91FE464CD75101DA6B6BAB60555C6465E5BCB3AF) which can be found
here.