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Versioning for #[runtime-interface] (#5328)

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* versionned runtime-interface

* use only one additional wasm blob

* alter docs

* formatting, naming and docs

* add comment for test

* version duplicate err

* RuntimeInterfaceItem -> RuntimeInterfaceFunction<

* test naming

* version checking

* remove spaces

* Update primitives/runtime-interface/proc-macro/src/runtime_interface/bare_function_interface.rs

Co-Authored-By: Bastian Köcher <bkchr@users.noreply.github.com>

* remove sanity checks and reduce coverage

* add doc comment

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
This commit is contained in:
Nikolay Volf
2020-03-23 07:09:05 -07:00
committed by GitHub
parent fe68d6fd8c
commit 4d3557d5a1
22 changed files with 556 additions and 104 deletions
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substrate/primitives/runtime-interface/src/lib.rs
+40 -14
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@@ -129,11 +129,22 @@ pub use sp_std;
/// /// A function that can be called from native/wasm.
/// ///
/// /// The implementation given to this function is only compiled on native.
/// fn call_some_complex_code(data: &[u8]) -> Vec<u8> {
/// fn call(data: &[u8]) -> Vec<u8> {
/// // Here you could call some rather complex code that only compiles on native or
/// // is way faster in native than executing it in wasm.
/// Vec::new()
/// }
/// /// Call function, but different version.
/// ///
/// /// For new runtimes, only function with latest version is reachable.
/// /// But old version (above) is still accessible for old runtimes.
/// /// Default version is 1.
/// #[version(2)]
/// fn call(data: &[u8]) -> Vec<u8> {
/// // Here you could call some rather complex code that only compiles on native or
/// // is way faster in native than executing it in wasm.
/// [17].to_vec()
/// }
///
/// /// A function can take a `&self` or `&mut self` argument to get access to the
/// /// `Externalities`. (The generated method does not require
@@ -157,13 +168,15 @@ pub use sp_std;
/// // on the visibility of the trait declaration.
/// mod interface {
/// trait Interface {
/// fn call_some_complex_code(data: &[u8]) -> Vec<u8>;
/// fn set_or_clear(&mut self, optional: Option<Vec<u8>>);
/// fn call_version_1(data: &[u8]) -> Vec<u8>;
/// fn call_version_2(data: &[u8]) -> Vec<u8>;
/// fn set_or_clear_version_1(&mut self, optional: Option<Vec<u8>>);
/// }
///
/// impl Interface for &mut dyn sp_externalities::Externalities {
/// fn call_some_complex_code(data: &[u8]) -> Vec<u8> { Vec::new() }
/// fn set_or_clear(&mut self, optional: Option<Vec<u8>>) {
/// fn call_version_1(data: &[u8]) -> Vec<u8> { Vec::new() }
/// fn call_version_2(data: &[u8]) -> Vec<u8> { [17].to_vec() }
/// fn set_or_clear_version_1(&mut self, optional: Option<Vec<u8>>) {
/// match optional {
/// Some(value) => self.set_storage([1, 2, 3, 4].to_vec(), value),
/// None => self.clear_storage(&[1, 2, 3, 4]),
@@ -171,12 +184,25 @@ pub use sp_std;
/// }
/// }
///
/// pub fn call_some_complex_code(data: &[u8]) -> Vec<u8> {
/// <&mut dyn sp_externalities::Externalities as Interface>::call_some_complex_code(data)
/// pub fn call(data: &[u8]) -> Vec<u8> {
/// // only latest version is exposed
/// call_version_2(data)
/// }
///
/// fn call_version_1(data: &[u8]) -> Vec<u8> {
/// <&mut dyn sp_externalities::Externalities as Interface>::call_version_1(data)
/// }
///
/// fn call_version_2(data: &[u8]) -> Vec<u8> {
/// <&mut dyn sp_externalities::Externalities as Interface>::call_version_2(data)
/// }
///
/// pub fn set_or_clear(optional: Option<Vec<u8>>) {
/// sp_externalities::with_externalities(|mut ext| Interface::set_or_clear(&mut ext, optional))
/// set_or_clear_version_1(optional)
/// }
///
/// fn set_or_clear_version_1(optional: Option<Vec<u8>>) {
/// sp_externalities::with_externalities(|mut ext| Interface::set_or_clear_version_1(&mut ext, optional))
/// .expect("`set_or_clear` called outside of an Externalities-provided environment.")
/// }
///
@@ -205,7 +231,7 @@ pub use sp_std;
/// /// `<ARGUMENT_TYPE as RIType>::FFIType`.
/// ///
/// /// `data` holds the pointer and the length to the `[u8]` slice.
/// pub fn ext_Interface_call_some_complex_code_version_1(data: u64) -> u64;
/// pub fn ext_Interface_call_version_1(data: u64) -> u64;
/// /// `optional` holds the pointer and the length of the encoded value.
/// pub fn ext_Interface_set_or_clear_version_1(optional: u64);
/// }
@@ -213,18 +239,18 @@ pub use sp_std;
///
/// /// The type is actually `ExchangeableFunction` (from `sp-runtime-interface`).
/// ///
/// /// This can be used to replace the implementation of the `call_some_complex_code` function.
/// /// This can be used to replace the implementation of the `call` function.
/// /// Instead of calling into the host, the callee will automatically call the other
/// /// implementation.
/// ///
/// /// To replace the implementation:
/// ///
/// /// `host_call_some_complex_code.replace_implementation(some_other_impl)`
/// pub static host_call_some_complex_code: () = ();
/// /// `host_call.replace_implementation(some_other_impl)`
/// pub static host_call: () = ();
/// pub static host_set_or_clear: () = ();
///
/// pub fn call_some_complex_code(data: &[u8]) -> Vec<u8> {
/// // This is the actual call: `host_call_some_complex_code.get()(data)`
/// pub fn call(data: &[u8]) -> Vec<u8> {
/// // This is the actual call: `host_call.get()(data)`
/// //
/// // But that does not work for several reasons in this example, so we just return an
/// // empty vector.