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Make API backwards compatible with CC (#1697)

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* Rework how a runtime api calls into the runtime

Now we generate a default implementation for each api call that calls
a generated method `method_runtime_api_impl`. This newly generated
method is the one that will be implemented by the `impl_runtime_apis`
macro in the runtime for the client side.

* Support `changed_in` to change runtime api function signatures

* Update documentation

* Fixes tests

* Implement checking the api version with a predicate

* Make the implementation backwards compatible with CC

* Update wasm files after merge

* Check for wasm runtime differences by building master and current branch

* Update spec_version and wasm files

* Fixes

* Revert my changes

* Remove `patch.crates-io` from test-runtime
This commit is contained in:
Bastian Köcher
2019-02-06 11:47:47 +01:00
committed by Gav Wood
parent 1ba7e35c18
commit 190393d476
25 changed files with 731 additions and 224 deletions
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substrate/core/sr-api-macros/src/lib.rs
+11 -2
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@@ -159,7 +159,11 @@ pub fn impl_runtime_apis(input: TokenStream) -> TokenStream {
///
/// To support versioning of the traits, the macro supports the attribute `#[api_version(1)]`.
/// The attribute supports any `u32` as version. By default, each trait is at version `1`, if no
/// version is provided.
/// version is provided. We also support chaning the signature of a method. This signature
/// change is highlighted with the `#[changed_in(2)]` attribute above a method. A method that is
/// tagged with this attribute is callable by the name `METHOD_before_version_VERSION`. This
/// method will only support calling into wasm, trying to call into native will fail (change the
/// spec version!). Such a method also does not need to be implemented in the runtime.
///
/// ```rust
/// #[macro_use]
@@ -171,8 +175,13 @@ pub fn impl_runtime_apis(input: TokenStream) -> TokenStream {
/// pub trait Balance {
/// /// Get the balance.
/// fn get_balance() -> u64;
/// /// Set the balance.
/// /// Set balance.
/// fn set_balance(val: u64);
/// /// Set balance, old version.
/// ///
/// /// Is callable by `set_balance_before_version_2`.
/// #[changed_in(2)]
/// fn set_balance(val: u8);
/// /// In version 2, we added this new function.
/// fn increase_balance(val: u64);
/// }