Oliver Tale-Yazdi
7a2c9d4a9a
Preparation for https://github.com/paritytech/polkadot-sdk/pull/3935 Changes: - Add some `default-features = false` for the case that a crate and that dependency both support nostd builds. - Shuffle files around of some benchmarking-only crates. These conditionally disabled the `cfg_attr` for nostd and pulled in libstd. Example [here](https://github.com/ggwpez/zepter/pull/95). The actual logic is moved into a `inner.rs` to preserve nostd capability of the crate in case the benchmarking feature is disabled. - Add some `use sp_std::vec` where needed. - Remove some `optional = true` in cases where it was not optional. - Removed one superfluous `cfg_attr(not(feature = "std"), no_std..`. All in all this should be logical no-op. --------- Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>
Offchain Worker Example Pallet
The Offchain Worker Example: A simple pallet demonstrating concepts, APIs and structures common to most offchain workers.
Run cargo doc --package pallet-example-offchain-worker --open to view this module's
documentation.
This pallet serves as an example showcasing Substrate off-chain worker and is not meant to be used in production.
Overview
In this example we are going to build a very simplistic, naive and definitely NOT
production-ready oracle for BTC/USD price.
Offchain Worker (OCW) will be triggered after every block, fetch the current price
and prepare either signed or unsigned transaction to feed the result back on chain.
The on-chain logic will simply aggregate the results and store last 64 values to compute
the average price.
Additional logic in OCW is put in place to prevent spamming the network with both signed
and unsigned transactions, and custom UnsignedValidator makes sure that there is only
one unsigned transaction floating in the network.
License: MIT-0