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Implement parameterisable modules (#1800)

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* first implementation

* remove done comment

* origin done

* impl log for instance

* impl inherent for instance

* Fix wasm build + full example build

this requires parity codec implements codec for core::marker::PhantomData

* patch parity-codec link to github branch

* improve internal names and fix instance prefix

* Fix in macros

* add test modules for support

this allow to test for construct_runtime as well.

The reason to have put that in another crate is:
* if we put test in `tests/` dir of srml/support then decl_storage fails to get
  srml-support access because it believes it is inside srml-support
  crate and so derive access to `quote!{ crate }` but this is wrong
  (and I don't see any way to prevent that, and it only bother us so I
  don't think that matters that much)
* if we put test inside lib.rs then contruct_runtime cannot be used
  because it call some macros that are defined with macros
  (decl_outer_event and decl_outer_origin) and thus rustc complains.

* defaultinstance to its own struct to avoid errors

* enforce <T, I> for Event and Config, impl test

* add origin, log, inherent to test

* test more code generation

* basic storage test

* fix typo

* rename a few imports and field

* delete wip test in example and runtime

* change default prefix to make it backward compatible with test

* rename Instance to I and Instantiable to Instance

note: the name of generic parameter I is only enforce by decl_module!
and this could be rewritten

* doc

* clean old TODOs

* update parity-codec to 3.2

* update node impl version + builds

* fix warning

* fix unrelated grandpa test

* refactor code
This commit is contained in:
thiolliere
2019-03-15 19:25:18 +01:00
committed by Gav Wood
parent c52c528ee8
commit d743a8b71f
80 changed files with 1632 additions and 1016 deletions
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substrate/srml/support/procedural/src/lib.rs
+12
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@@ -58,6 +58,18 @@ use proc_macro::TokenStream;
/// ```
/// or when at least one storage field requires default initialization (both `get` and `config` or `build`).
/// This struct can be expose as `Config` by `decl_runtime` macro.
///
/// ### Module with instances
///
/// `decl_storage!` macro support building modules with instances with the following syntax: (DefaultInstance type
/// is optionnal)
/// ```nocompile
/// trait Store for Module<T: Trait<I>, I: Instance=DefaultInstance> as Example {}
/// ```
///
/// Then the genesis config is generated with two generic parameter `GenesisConfig<T, I>`
/// and storages are now accessible using two generic parameters like:
/// `<Dummy<T, I>>::get()` or `Dummy::<T, I>::get()`
#[proc_macro]
pub fn decl_storage(input: TokenStream) -> TokenStream {
storage::transformation::decl_storage_impl(input)