State module

One of the core modules we have so far. We get runtime metadata using it, and fetching storage items for all of other modules.

interface StateModule {
    suspend fun getRuntimeMetadata(): RuntimeMetadata?

    suspend fun <T: Any> fetchStorageItem(
        item: RuntimeModuleStorageItem,
        storage: RuntimeModuleStorage,
        type: KClass<T>
    ): T?

    suspend fun <T: Any> fetchStorageItem(
        item: RuntimeModuleStorageItem,
        key: ByteArrayConvertible,
        storage: RuntimeModuleStorage,
        type: KClass<T>
    ): T?

    suspend fun <T: Any> fetchStorageItem(
        item: RuntimeModuleStorageItem,
        keys: List<ByteArrayConvertible>,
        storage: RuntimeModuleStorage,
        type: KClass<T>
    ): T?
}

To simply get metadata of runtime use this:

val client: SubstrateClient
val runtimeMetadata: RuntimeMetadata? = client.modules.state.getRuntimeMetadata()

For fetching storage items, we strongly encourage not to use them as we have a powerful storage service.