78 lines
3.1 KiB
Markdown
78 lines
3.1 KiB
Markdown
Welcome, fellow coder!
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This repository contains a code to run a lightning protocol daemon.
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It's broken into subdaemons, with the idea being that we can add more
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layers of separation between different clients and extra barriers to
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exploits.
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It is designed to implement the lightning protocol as specified in
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[various BOLTs](https://github.com/lightningnetwork/lightning-rfc).
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Getting Started
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---------------
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It's in C, to encourage alternate implementations. It uses the Linux
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coding style. Patches are welcome!
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To read the code, you'll probably need to understand ccan/tal: it's a
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hierarchical memory allocator, where each allocation has a parent, and
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thus lifetimes are grouped. eg. a 'struct bitcoin_tx' has a pointer
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to an array of 'struct bitcoin_tx_input'; they are allocated off the
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'struct bitcoind_tx', so freeing the 'struct bitcoind_tx' frees them
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all. Tal also supports destructors, which are usually used to remove
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things from lists, etc.
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The daemons mostly use async io (ccan/io): you register callbacks and they
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happen once I/O is available, then you return what to do next. This
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does not use threads, so the code flow is generally fairly simple.
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Here's a list of parts, with notes:
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* ccan - useful routines from http://ccodearchive.net
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- Use make update-ccan to update it.
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- Use make update-ccan CCAN_NEW="mod1 mod2..." to add modules
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* bitcoin/ - bitcoin script, signature and transaction routines.
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- Not a complete set, but enough for our purposes.
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* external/ - external libraries from other sources
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- libsodium - encryption library (should be replaced soon with built-in)
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- libwally-core - bitcoin helper library
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- secp256k1 - bitcoin curve encryption library within libwally-core
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- jsmn - tiny JSON parsing helper
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- libbase58 - base58 address encoding/decoding library.
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* tools/ - tools for building
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- check-bolt.c: check the source code contains correct BOLT quotes
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(as used by check-source)
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- generate-wire.py: generate marshal/unmarshal routines from
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extracts from BOLT specs, and as specified by subdaemons.
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* contrib/ - python support and other stuff which doesn't belong :)
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* wire/ - basic marshalling/un
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* common/ - routines needed by any two or more of the directories below
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* cli/ - commandline utility to control lightning daemon.
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* lightningd/ - master daemon which controls the subdaemons and passes peer file descriptors between them.
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* wallet/ - database code used by master for tracking what's happening.
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* hsmd/ - daemon which looks after the cryptographic secret, and performs commitment signing.
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* gossipd/ - daemon to chat to peers which don't have any channels, and maintains routing information and broadcasts gossip.
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* openingd/ - daemon to open a channel for a single peer.
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* channeld/ - daemon to operate a single peer once channel is operating normally.
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* closingd/ - daemon to handle mutual closing negotiation with a single peer.
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* onchaind/ - daemon to hand a single channel which has had its funding transaction spent.
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Feel free to ask questions on the lightning-dev mailing list, or on #c-lightning on IRC, or email me at rusty@rustcorp.com.au.
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Cheers!<br>
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Rusty.
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