Bastian Köcher 22db788c08 Optimize decode_len (#5975) ...

* Optimize `decode_len`

Instead of reading the full storage value into the runtime, we only read
at maximum `5bytes` from the storage into the runtime. Furthermore this
drops any handling with regards to set default values in
`decl_storage!`. If the value does not exists or the decoding of the
length fails, it will return `None`. To prevent people from messing
stuff up, this feature relies on the `StorageDecodeLength` trait that is
sealed by `frame-support` (aka only implementable inside this crate).

* Some clean ups

* Update frame/support/src/storage/mod.rs

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

Co-authored-by: Alexander Popiak <alexander.popiak@parity.io>

2020-05-12 12:13:28 +02:00

substrate

Optimize decode_len (#5975)

2020-05-12 12:13:28 +02:00

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