-
Notifications
You must be signed in to change notification settings - Fork 363
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
Macro for composing custom message handlers #1832
Macro for composing custom message handlers #1832
Conversation
One alternative to discuss is going the macro-only approach and actually taking a patern vs a min/max: #1813 (comment) I don't have a strong opinion, just throwing it out there. |
75e4328
to
130921b
Compare
Nice! I think we should restrict the macro a bit to also implement CustomMessageHandler on the generated struct. |
a08ce0f
to
f92b97e
Compare
Codecov ReportBase: 87.33% // Head: 87.92% // Increases project coverage by
📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more Additional details and impacted files@@ Coverage Diff @@
## main #1832 +/- ##
==========================================
+ Coverage 87.33% 87.92% +0.59%
==========================================
Files 100 100
Lines 44160 47330 +3170
Branches 44160 47330 +3170
==========================================
+ Hits 38568 41616 +3048
- Misses 5592 5714 +122
Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here. ☔ View full report at Codecov. |
LGTM |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Making sure I'm understanding this PR correctly: currently PeerManager
is created with a single CustomMessageHandler
that handles custom lightning messages for application specific/experimental messages. You can implement CustomMessageHandler
on a specific message type, but if you want to handle multiple custom messages, it's a lot of boilerplate to combine the different handlers into one (which is required to handle multiple custom messages)--and this macro makes this easy. If I'm getting that all right, this seems really clean!
Out of scope for this PR, but wanted to mention while I was going through this code it took me a bit to realize how CustomMessageHandler
was used in PeerManager
, as there's not much mention of each other in either of their respective docs. In hindsight it seems sorta obvious but that was something I ran into.
//! composite_custom_message_handler!( | ||
//! pub struct FooBarBazHandler { | ||
//! foo_bar: FooBarHandler, | ||
//! baz: BazHandler, | ||
//! } | ||
//! | ||
//! pub enum FooBarBazMessage { | ||
//! FooBar(foo_bar_type_ids!()), | ||
//! Baz(baz_type_id!()), | ||
//! } | ||
//! ); |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Is there a reason someone would opt for using the macro multiple times like this as opposed to just listing each message + handler in one? i.e.
composite_custom_message_handler!(
pub struct FooBarBazHandler {
foo: FooHandler,
bar: BarHandler,
baz: BazHandler,
}
...
}
Also is there significance to the foo_bar_type_ids
being the |
of the two type ids or was that mostly arbitrary? Otherwise, I thought the FooBar
example was very helpful/straightforward!
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Is there a reason someone would opt for using the macro multiple times like this as opposed to just listing each message + handler in one? i.e.
composite_custom_message_handler!( pub struct FooBarBazHandler { foo: FooHandler, bar: BarHandler, baz: BazHandler, } ... }
That is also possible, though the example is meant to demonstrate arbitrary composition. This may be useful when FooBarHandler
is defined in one crate and you want to use it along with BazHandler
in your own crate. I've added some comments to the example to clarify this use case.
Also is there significance to the
foo_bar_type_ids
being the|
of the two type ids or was that mostly arbitrary? Otherwise, I thought theFooBar
example was very helpful/straightforward!
Yes, the macro matcher $pattern
uses a pat
specifier, meaning it can be anything rust considers a pattern, including the composition of patterns using |
.
https://doc.rust-lang.org/reference/patterns.html
Someone using the macro could use a range of type ids instead, e.g., 32768..=32769
. Though the |
approach is preferred for the reason given in the macro's docs.
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
That is also possible, though the example is meant to demonstrate arbitrary composition. This may be useful when FooBarHandler is defined in one crate and you want to use it along with BazHandler in your own crate. I've added some comments to the example to clarify this use case.
Ah makes sense!
Yes, the macro matcher
$pattern
uses apat
specifier, meaning it can be anything rust considers a pattern, including the composition of patterns using|
.
Ohh I see I didn't realize it was being used as a pattern I thought it was doing a bitwise OR of the two type ids, that's cool.
Thanks for the review! All good feedback.
Correct!
Hmm... yeah, those docs could use some work. I've added a commit that re-writes them. |
daefd33
to
5383d5f
Compare
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Latest changes to the docs look great!
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Needs CI testing, but LGTM, let's just rebase and land this.
//! fn type_id(&self) -> u16 { foo_type_id!() } | ||
//! } | ||
//! impl Writeable for Foo { | ||
//! // ... |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
nit: tabs not spaces
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
So, I believe all (most?) of our doctests use spaces. IIRC, there was some weirdness around the leading "//! " and the first tab not indenting enough. Especially, if the space after the comment was skipped in lieu of the first tab.
//! [BOLT 1]: https://github.com/lightning/bolts/blob/master/01-messaging.md | ||
//! [`CustomMessageHandler`]: crate::lightning::ln::peer_handler::CustomMessageHandler | ||
|
||
#![doc(test(no_crate_inject, attr(deny(warnings))))] |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
What is a no_crate_inject and why are we denying compilation warnings?
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
no_crate_inject
is needed otherwise we can't add #[macro_use]
on the crate in the doc test.
For warnings, I was testing out unreachable patterns in the doc test, so needed that for it fail. I can remove it now, I suppose.
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Yea, I just generally worry about deny(warnings)
cause that means CI will start failing on a new rustc without us touching anything. We'll fix warnings when we find them.
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
FWIW, this only affects doc tests.
//! pub struct Baz; | ||
//! | ||
//! macro_rules! baz_type_id { | ||
//! () => { 32770 } |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Would be cool to demonstrate baz supporting two different message ids internally.
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Probably better left for CustomMessageHandler
docs?
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Well with the macro_rules-specific stuff for this crate.
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Like what is done using the FooBarHandler? I thought you had meant showing a leaf handler handling more than one message.
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Right, I did mean a leaf handler handling more than one message feeding into one MessageHandler
. I guess it doesn't matter, though, as long as the documentation mentions that you can do any pattern (which it does) and maybe mention in the example that they don't have to be in different crate(s).
5383d5f
to
65c362b
Compare
Needs test but can be saved for a follow-up. |
Test or not we should add something that hits this code in CI. |
Ah, sorry! Misread your comment. Let's see if the latest commit triggers testing on the crate. |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
LGTM, needs a rebase
@@ -11,6 +11,7 @@ members = [ | |||
] | |||
|
|||
exclude = [ | |||
"lightning-custom-message", |
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Any reason it's excluded?
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Trying to compile using cargo +1.41.1 check
gives:
error: failed to parse manifest at `/Users/jkczyz/src/rust-lightning/lightning-custom-message/Cargo.toml`
Caused by:
failed to parse the `edition` key
Caused by:
supported edition values are `2015` or `2018`, but `2021` is unknown
But after rebasing, it looks like that's also a problem for one one of lightning-transaction-sync
's dependencies, as well. I guess we just can't build the entire workspace with an older rust version now?
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Ah, I guess CI doesn't try to build the workspace at all then since it's passing without excluding lightning-transaction-sync
. We probably shouldn't break the default way to build for users on our MSRV, so we should exclude lightning-transaction-sync
as well.
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Ok, correction, the above command also doesn't work because lightning-net-tokio
requires a higher version. So moving lightning-custom-message
back into the members should be fine.
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
Spoke to soon. CI is unhappy because of the edition:
error: failed to parse manifest at `/home/runner/work/rust-lightning/rust-lightning/lightning-custom-message/Cargo.toml`
Caused by:
failed to parse the `edition` key
Caused by:
supported edition values are `2015` or `2018, but `2021` is unknown
0eac871
to
e7c0c5e
Compare
e7c0c5e
to
19cbab4
Compare
BOLT 1 specifies a custom message type range for use with experimental or application-specific messages. While a `CustomMessageHandler` can be defined to support more than one message type, defining such a handler requires a significant amount of boilerplate and can be error prone. Add a crate exporting a `composite_custom_message_handler` macro for easily composing pre-defined custom message handlers. The resulting handler can be further composed with other custom message handlers using the same macro. This requires a separate crate since the macro needs to support "or" patterns in macro_rules, which is only available in edition 2021. https://doc.rust-lang.org/edition-guide/rust-2021/or-patterns-macro-rules.html Otherwise, a crate defining a handler for a set of custom messages could not easily be reused with another custom message handler. Doing so would require explicitly duplicating the reused handlers type ids, but those may change when the crate is updated.
These are seen in newer versions of rustc.
Documentation for CustomMessageHandler wasn't clear how it is related to PeerManager and contained some grammatical and factual errors. Re-write the docs and link to the lightning_custom_message crate.
19cbab4
to
9876a08
Compare
There was a problem hiding this comment.
Choose a reason for hiding this comment
The reason will be displayed to describe this comment to others. Learn more.
TIL you can iterate over multiple macro repeats at once.
0.0.114 - Mar 3, 2023 - "Faster Async BOLT12 Retries" API Updates =========== * `InvoicePayer` has been removed and its features moved directly into `ChannelManager`. As such it now requires a simplified `Router` and supports `send_payment_with_retry` (and friends). `ChannelManager::retry_payment` was removed in favor of the automated retries. Invoice payment utilities in `lightning-invoice` now call the new code (lightningdevkit#1812, lightningdevkit#1916, lightningdevkit#1929, lightningdevkit#2007, etc). * `Sign`/`BaseSign` has been renamed `ChannelSigner`, with `EcdsaChannelSigner` split out in anticipation of future schnorr/taproot support (lightningdevkit#1967). * The catch-all `KeysInterface` was split into `EntropySource`, `NodeSigner`, and `SignerProvider`. `KeysManager` implements all three (lightningdevkit#1910, lightningdevkit#1930). * `KeysInterface::get_node_secret` is now `KeysManager::get_node_secret_key` and is no longer required for external signers (lightningdevkit#1951, lightningdevkit#2070). * A `lightning-transaction-sync` crate has been added which implements keeping LDK in sync with the chain via an esplora server (lightningdevkit#1870). Note that it can only be used on nodes that *never* ran a previous version of LDK. * `Score` is updated in `BackgroundProcessor` instead of via `Router` (lightningdevkit#1996). * `ChainAccess::get_utxo` (now `UtxoAccess`) can now be resolved async (lightningdevkit#1980). * BOLT12 `Offer`, `InvoiceRequest`, `Invoice` and `Refund` structs as well as associated builders have been added. Such invoices cannot yet be paid due to missing support for blinded path payments (lightningdevkit#1927, lightningdevkit#1908, lightningdevkit#1926). * A `lightning-custom-message` crate has been added to make combining multiple custom messages into one enum/handler easier (lightningdevkit#1832). * `Event::PaymentPathFailure` is now generated for failure to send an HTLC over the first hop on our local channel (lightningdevkit#2014, lightningdevkit#2043). * `lightning-net-tokio` no longer requires an `Arc` on `PeerManager` (lightningdevkit#1968). * `ChannelManager::list_recent_payments` was added (lightningdevkit#1873). * `lightning-background-processor` `std` is now optional in async mode (lightningdevkit#1962). * `create_phantom_invoice` can now be used in `no-std` (lightningdevkit#1985). * The required final CLTV delta on inbound payments is now configurable (lightningdevkit#1878) * bitcoind RPC error code and message are now surfaced in `block-sync` (lightningdevkit#2057). * Get `historical_estimated_channel_liquidity_probabilities` was added (lightningdevkit#1961). * `ChannelManager::fail_htlc_backwards_with_reason` was added (lightningdevkit#1948). * Macros which implement serialization using TLVs or straight writing of struct fields are now public (lightningdevkit#1823, lightningdevkit#1976, lightningdevkit#1977). Backwards Compatibility ======================= * Any inbound payments with a custom final CLTV delta will be rejected by LDK if you downgrade prior to receipt (lightningdevkit#1878). * `Event::PaymentPathFailed::network_update` will always be `None` if an 0.0.114-generated event is read by a prior version of LDK (lightningdevkit#2043). * `Event::PaymentPathFailed::all_paths_removed` will always be false if an 0.0.114-generated event is read by a prior version of LDK. Users who rely on it to determine payment retries should migrate to `Event::PaymentFailed`, in a separate release prior to upgrading to LDK 0.0.114 if downgrading is supported (lightningdevkit#2043). Performance Improvements ======================== * Channel data is now stored per-peer and channel updates across multiple peers can be operated on simultaneously (lightningdevkit#1507). * Routefinding is roughly 1.5x faster (lightningdevkit#1799). * Deserializing a `NetworkGraph` is roughly 6x faster (lightningdevkit#2016). * Memory usage for a `NetworkGraph` has been reduced substantially (lightningdevkit#2040). * `KeysInterface::get_secure_random_bytes` is roughly 200x faster (lightningdevkit#1974). Bug Fixes ========= * Fixed a bug where a delay in processing a `PaymentSent` event longer than the time taken to persist a `ChannelMonitor` update, when occurring immediately prior to a crash, may result in the `PaymentSent` event being lost (lightningdevkit#2048). * Fixed spurious rejections of rapid gossip sync data when the graph has been updated by other means between gossip syncs (lightningdevkit#2046). * Fixed a panic in `KeysManager` when the high bit of `starting_time_nanos` is set (lightningdevkit#1935). * Resolved an issue where the `ChannelManager::get_persistable_update_future` future would fail to wake until a second notification occurs (lightningdevkit#2064). * Resolved a memory leak when using `ChannelManager::send_probe` (lightningdevkit#2037). * Fixed a deadlock on some platforms at least when using async `ChannelMonitor` updating (lightningdevkit#2006). * Removed debug-only assertions which were reachable in threaded code (lightningdevkit#1964). * In some cases when payment sending fails on our local channel retries no longer take the same path and thus never succeed (lightningdevkit#2014). * Retries for spontaneous payments have been fixed (lightningdevkit#2002). * Return an `Err` if `lightning-persister` fails to read the directory listing rather than panicing (lightningdevkit#1943). * `peer_disconnected` will now never be called without `peer_connected` (lightningdevkit#2035) Security ======== 0.0.114 fixes several denial-of-service vulnerabilities which are reachable from untrusted input from channel counterparties or in deployments accepting inbound connections or channels. It also fixes a denial-of-service vulnerability in rare cases in the route finding logic. * The number of pending un-funded channels as well as peers without funded channels is now limited to avoid denial of service (lightningdevkit#1988). * A second `channel_ready` message received immediately after the first could lead to a spurious panic (lightningdevkit#2071). This issue was introduced with 0conf support in LDK 0.0.107. * A division-by-zero issue was fixed in the `ProbabilisticScorer` if the amount being sent (including previous-hop fees) is equal to a channel's capacity while walking the graph (lightningdevkit#2072). The division-by-zero was introduced with historical data tracking in LDK 0.0.112. In total, this release features 130 files changed, 21457 insertions, 10113 deletions in 343 commits from 18 authors, in alphabetical order: * Alec Chen * Allan Douglas R. de Oliveira * Andrei * Arik Sosman * Daniel Granhão * Duncan Dean * Elias Rohrer * Jeffrey Czyz * John Cantrell * Kurtsley * Matt Corallo * Max Fang * Omer Yacine * Valentine Wallace * Viktor Tigerström * Wilmer Paulino * benthecarman * jurvis
Macro for composing custom message handlers BOLT 1 specifies a custom message type range for use with experimental or application-specific messages. While a
CustomMessageHandler
can be defined to support more than one message type, defining such a handler requires a significant amount of boilerplate and can be error prone.Add a crate exporting a
composite_custom_message_handler
macro for easily composing pre-defined custom message handlers. The resulting handler can be further composed with other custom message handlers using the same macro.This requires a separate crate since the macro needs to support "or" patterns in macro_rules, which is only available in edition 2021.
https://doc.rust-lang.org/edition-guide/rust-2021/or-patterns-macro-rules.html
Otherwise, a crate defining a handler for a set of custom messages could not easily be reused with another custom message handler. Doing so would require explicitly duplicating the reused handlers type ids, but those may change when the crate is updated.
Fixes #1813.