mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Gavin Wood
ff5765eac3
* Reservable, Transferrable Fungible(s), plus adapters. * Repot into new dir * Imbalances for Fungibles * Repot and balanced fungible. * Clean up names and bridge-over Imbalanced. * Repot frame_support::trait. Finally. * Make build. * Docs * Good errors * Fix tests. Implement fungible::Inspect for Balances. * Implement additional traits for Balances. * Revert UI test "fixes" * Fix UI error * Fix UI test * Fixes * Update lock * Grumbles * Grumbles * Fixes Co-authored-by: Bastian Köcher <info@kchr.de>
55 lines
2.5 KiB
Rust
55 lines
2.5 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2019-2021 Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Traits for dealing with on-chain randomness.
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/// A trait that is able to provide randomness.
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///
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/// Being a deterministic blockchain, real randomness is difficult to come by, different
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/// implementations of this trait will provide different security guarantees. At best,
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/// this will be randomness which was hard to predict a long time ago, but that has become
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/// easy to predict recently.
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pub trait Randomness<Output, BlockNumber> {
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/// Get the most recently determined random seed, along with the time in the past
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/// since when it was determinable by chain observers.
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///
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/// `subject` is a context identifier and allows you to get a different result to
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/// other callers of this function; use it like `random(&b"my context"[..])`.
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///
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/// NOTE: The returned seed should only be used to distinguish commitments made before
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/// the returned block number. If the block number is too early (i.e. commitments were
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/// made afterwards), then ensure no further commitments may be made and repeatedly
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/// call this on later blocks until the block number returned is later than the latest
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/// commitment.
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fn random(subject: &[u8]) -> (Output, BlockNumber);
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/// Get the basic random seed.
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///
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/// In general you won't want to use this, but rather `Self::random` which allows
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/// you to give a subject for the random result and whose value will be
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/// independently low-influence random from any other such seeds.
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///
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/// NOTE: The returned seed should only be used to distinguish commitments made before
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/// the returned block number. If the block number is too early (i.e. commitments were
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/// made afterwards), then ensure no further commitments may be made and repeatedly
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/// call this on later blocks until the block number returned is later than the latest
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/// commitment.
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fn random_seed() -> (Output, BlockNumber) {
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Self::random(&[][..])
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}
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}
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