mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-05-30 07:01:03 +00:00
Bastian Köcher
06386558ae
* Make use of `runtime_interface` for parachain externalities This also changes the encoding of the `ValidationResult` return value to match the default encoding used in Substrate. * Fix compilation for web * Update `Cargo.lock` * Include feedback * Move proc macro * Update parachain/src/lib.rs Co-Authored-By: Robert Habermeier <rphmeier@gmail.com> Co-authored-by: Robert Habermeier <rphmeier@gmail.com>
66 lines
2.5 KiB
Rust
66 lines
2.5 KiB
Rust
// Copyright 2019-2020 Parity Technologies (UK) Ltd.
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// This file is part of Polkadot.
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// Polkadot is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Polkadot is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Polkadot. If not, see <http://www.gnu.org/licenses/>.
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//! Utilities for writing parachain WASM.
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use crate::{TargetedMessage, UpwardMessage};
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use sp_runtime_interface::runtime_interface;
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#[cfg(feature = "std")]
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use sp_externalities::ExternalitiesExt;
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/// The parachain api for posting messages.
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// Either activate on `std` to get access to the `HostFunctions` or when `wasm-api` is given and on
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// `no_std`.
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#[cfg(any(feature = "std", all(not(feature = "std"), feature = "wasm-api")))]
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#[runtime_interface]
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pub trait Parachain {
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/// Post a message to another parachain.
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fn post_message(&mut self, msg: TargetedMessage) {
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self.extension::<crate::wasm_executor::ParachainExt>()
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.expect("No `ParachainExt` associated with the current context.")
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.post_message(msg)
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.expect("Failed to post message")
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}
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/// Post a message to this parachain's relay chain.
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fn post_upward_message(&mut self, msg: UpwardMessage) {
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self.extension::<crate::wasm_executor::ParachainExt>()
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.expect("No `ParachainExt` associated with the current context.")
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.post_upward_message(msg)
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.expect("Failed to post upward message")
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}
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}
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/// Load the validation params from memory when implementing a Rust parachain.
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///
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/// Offset and length must have been provided by the validation
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/// function's entry point.
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#[cfg(not(feature = "std"))]
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pub unsafe fn load_params(params: *const u8, len: usize) -> crate::ValidationParams {
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let mut slice = rstd::slice::from_raw_parts(params, len);
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codec::Decode::decode(&mut slice).expect("Invalid input data")
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}
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/// Allocate the validation result in memory, getting the return-pointer back.
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///
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/// As described in the crate docs, this is a pointer to the appended length
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/// of the vector.
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#[cfg(not(feature = "std"))]
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pub fn write_result(result: &crate::ValidationResult) -> u64 {
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sp_core::to_substrate_wasm_fn_return_value(&result)
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}
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