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Add constants to metadata #205

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emostov opened this issue Dec 16, 2020 · 0 comments · Fixed by #207
Closed

Add constants to metadata #205

emostov opened this issue Dec 16, 2020 · 0 comments · Fixed by #207
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@emostov
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emostov commented Dec 16, 2020

While storage, events, and errors are present in subxt Metadata, constants are missing.

While subxt users may likely find numerous use cases for constants, a couple use case within subxt itself come to mind:

  • System::Constants::TransactionByteFee and TransactionPayment::Constants::ExtrinsicBaseWeight could be used to do offchain fee calculations
  • System::Constants::BlockHashCount could be used for creating a better default mortality period for an extrinsic

It looks like constants are defined as a field of ModuleMetadata
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feat: Enable retrieval of constants from runtime metadata paritytech/subxt
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