Crate sc_offchain

Substrate offchain workers.

The offchain workers is a special function of the runtime that gets executed after block is imported. During execution it’s able to asynchronously submit extrinsics that will either be propagated to other nodes or added to the next block produced by the node as unsigned transactions.

Offchain workers can be used for computation-heavy tasks that are not feasible for execution during regular block processing. It can either be tasks that no consensus is required for, or some form of consensus over the data can be built on-chain for instance via:

1. Challenge period for incorrect computations
2. Majority voting for results
3. etc

Structs

• OffchainDb
  Offchain DB that implements DbExternalities for OffchainStorage.
• OffchainWorkerOptions
  Options for OffchainWorkers
• OffchainWorkers
  An offchain workers manager.

Enums

• NoOffchainStorage
  Special type that implements OffchainStorage.

Constants

• STORAGE_PREFIX
  Persistent storage prefix used by the Offchain Worker API when creating a DB key.

Traits

• NetworkProvider
  NetworkProvider provides OffchainWorkers with all necessary hooks into the underlying Substrate networking.
• OffchainWorkerApi
  The offchain worker api.