From 8cc026b4068e72ecb6d3e0d22a4ace266d59576d Mon Sep 17 00:00:00 2001 From: Jeffrey Czyz Date: Thu, 17 Jun 2021 13:40:52 -0500 Subject: [PATCH] Increase poll::Validate visibility to pub Previously, poll::Validate was pub(crate) to force external implementors of Poll to define their implementation in terms of ChainPoller. This was because ChainPoller::look_up_previous_header checks for consistency between headers and any errors would be checked at that level rather than by the caller. Otherwise, if performed by the caller, a Poll implementation would not be aware if the underlying BlockSource was providing bad data and therefore couldn't react accordingly. Widening the visibility to pub relaxes this requirement, although it's still encourage to use ChainPoller to implement Poll. This permits either copying or moving lightning-block-sync's test utilities to a separate crate since they use poll::Validate. --- lightning-block-sync/src/poll.rs | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) diff --git a/lightning-block-sync/src/poll.rs b/lightning-block-sync/src/poll.rs index fbe803b4c..6a1cd6598 100644 --- a/lightning-block-sync/src/poll.rs +++ b/lightning-block-sync/src/poll.rs @@ -44,7 +44,9 @@ pub enum ChainTip { } /// The `Validate` trait defines behavior for validating chain data. -pub(crate) trait Validate { +/// +/// This trait is sealed and not meant to be implemented outside of this crate. +pub trait Validate: sealed::Validate { /// The validated data wrapper which can be dereferenced to obtain the validated data. type T: std::ops::Deref; @@ -156,10 +158,18 @@ impl std::ops::Deref for ValidatedBlock { } } +mod sealed { + /// Used to prevent implementing [`super::Validate`] outside the crate but still allow its use. + pub trait Validate {} + + impl Validate for crate::BlockHeaderData {} + impl Validate for bitcoin::blockdata::block::Block {} +} + /// The canonical `Poll` implementation used for a single `BlockSource`. /// -/// Other `Poll` implementations must be built using `ChainPoller` as it provides the only means of -/// validating chain data. +/// Other `Poll` implementations should be built using `ChainPoller` as it provides the simplest way +/// of validating chain data and checking consistency. pub struct ChainPoller + Sized , T: BlockSource> { block_source: B, network: Network, -- 2.39.5