Crate subxt_metadata 

A representation of the metadata provided by a substrate based node. This representation is optimized to be used by Subxt and related crates, and is independent of the different versions of metadata that can be provided from a node.

Typically, this will be constructed by either:

1. Calling Metadata::decode() given some metadata bytes obtained from a node (this uses codec::Decode).
2. Obtaining frame_metadata::RuntimeMetadataPrefixed, and then using .try_into() to convert it into Metadata.

Structs

ConstantMetadata

Metadata for a single constant.

CustomMetadata

Metadata of custom types with custom values, basically the same as frame_metadata::v15::CustomMetadata<PortableForm>>.

CustomValueMetadata

Basically the same as frame_metadata::v15::CustomValueMetadata<PortableForm>>, but borrowed.

ExtrinsicMetadata

Metadata for the extrinsic type.

Metadata

Node metadata. This can be constructed by providing some compatible frame_metadata which is then decoded into this. We aim to preserve all of the existing information in the incoming metadata while optimizing the format a little for Subxt’s use cases.

MetadataHasher

Obtain a hash representation of our metadata or some part of it. This is obtained by calling crate::Metadata::hasher().

MethodParamMetadata

Metadata for a single input parameter to a runtime API method / pallet view function.

OuterEnumsMetadata

Metadata for the outer enums.

PalletMetadata

Metadata for a specific pallet.

RuntimeApiMetadata

Metadata for the available runtime APIs.

RuntimeApiMethodMetadata

Metadata for a single runtime API method.

StorageEntryMetadata

Metadata for a single storage entry.

StorageMetadata

Metadata for the storage entries in a pallet.

TransactionExtensionMetadata

Metadata for the signed extensions used by extrinsics.

ViewFunctionMetadata

Metadata for the available View Functions. Currently these exist only at the pallet level, but eventually they could exist at the runtime level too.

Enums

StorageEntryModifier

Is the storage entry optional, or does it have a default value.

StorageEntryType

The type of a storage entry.

StorageHasher

Hasher used by storage maps.

TryFromError

An error emitted if something goes wrong converting frame_metadata types into crate::Metadata.

Constants

SUPPORTED_METADATA_VERSIONS

The metadata versions that we support converting into crate::Metadata. These are ordest from highest to lowest, so that the metadata we’d want to pick first is first in the array.