Description of Changes

Adds the #[view] procedural macro and module describers for views.

#[view(public)]
fn player(ctx: &ViewContext) -> Vec<Player> {
    ctx.db.player().identity().find(ctx.sender).into_iter().collect()
}

#[view(public)]
fn player(ctx: &AnonymousViewContext, level: u32) -> Vec<Player> {
    ctx.db.player().level().filter(level).collect()
}

Note, this deviates from the proposal in that views may only return Vec<T> or Option<T>. They can't return an arbitrary SpacetimeType.

API and ABI breaking changes

This technically isn't a breaking change, but it's worth mentioning that this patch refactors ReducerInfo so that we can use it for views as well.

Expected complexity level and risk

2

Testing

• Negative compile tests
• Negative publish (module validation) tests
• Test system tables are updated accurately