Bastian Köcher
c8136bd1df
* Remove `serde` requirement from FRAME macros Currently there is some implicit requirement on `serde` being present in the `Cargo.toml` of a pallet when `GenesisConfig` is used. This pr removes this requirement by using the serde attribute `serde(crate = "..")`. * build a unique reexport of serde in impl_opaque_keys, by abusing paste doc concatenation * Optimize Co-authored-by: thiolliere <gui.thiolliere@gmail.com>
Offchain Worker Example Module
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.
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: Unlicense