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Typed chain state queries over rpc. (#4079)

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* Create typed client helpers for querying chain state storage items declared by
'decl_storage!'.

* Update substrate-rpc-custom functions to use async await syntax.

* The implementation of substrate-rpc-custom was a bit verbose and repetitive.
This commit makes the implementation simpler by intruducing a struct which
represents query for a typed value in storage. The new struct is called
StorageQuery. A StorageQuery wraps a raw StorageKey but is not directy
constructable. To construct a StorageQuery, the user must supply an
implementation of a srml_support::storage::generator trait such as
StorageValue or StorageMap.

A type implementing one of the generator traits can be aquired by:
A) marking a storage item as pub within a call to decl_storage (recommended)
or B) implementing one of the generator types manually.

While option B may sometimes me necessary, it's not recommended because
separate manual implementaions may lose sync with the original definition.

* drop unused dependency

* fmt

* Remove unnecessary pub from Authorities field in test-runtime storage
declaration.

This field was added to support a test in an earlier commit. The
test no longer relies on test-runtime so the change can be reverted.

* Move it to srml as support extension.

* Fix long lines.

* Fix.
This commit is contained in:
Tomasz Drwięga
2019-11-11 02:01:15 +01:00
committed by Bastian Köcher
parent bb0736cdba
commit 57ab3aeb82
5 changed files with 216 additions and 6 deletions
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substrate/srml/support/src/lib.rs
+10 -5
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@@ -262,16 +262,21 @@ mod tests {
decl_storage! {
trait Store for Module<T: Trait> as Example {
pub Data get(fn data) build(|_| vec![(15u32, 42u64)]): linked_map hasher(twox_64_concat) u32 => u64;
pub Data get(fn data) build(|_| vec![(15u32, 42u64)]):
linked_map hasher(twox_64_concat) u32 => u64;
pub OptionLinkedMap: linked_map u32 => Option<u32>;
pub GenericData get(fn generic_data): linked_map hasher(twox_128) T::BlockNumber => T::BlockNumber;
pub GenericData2 get(fn generic_data2): linked_map T::BlockNumber => Option<T::BlockNumber>;
pub GenericData get(fn generic_data):
linked_map hasher(twox_128) T::BlockNumber => T::BlockNumber;
pub GenericData2 get(fn generic_data2):
linked_map T::BlockNumber => Option<T::BlockNumber>;
pub GetterNoFnKeyword get(no_fn): Option<u32>;
pub DataDM config(test_config) build(|_| vec![(15u32, 16u32, 42u64)]):
double_map hasher(twox_64_concat) u32, blake2_256(u32) => u64;
pub GenericDataDM: double_map T::BlockNumber, twox_128(T::BlockNumber) => T::BlockNumber;
pub GenericData2DM: double_map T::BlockNumber, twox_256(T::BlockNumber) => Option<T::BlockNumber>;
pub GenericDataDM:
double_map T::BlockNumber, twox_128(T::BlockNumber) => T::BlockNumber;
pub GenericData2DM:
double_map T::BlockNumber, twox_256(T::BlockNumber) => Option<T::BlockNumber>;
pub AppendableDM: double_map u32, blake2_256(T::BlockNumber) => Vec<u32>;
}
}