Add runtime api DuniterAccountApi_estimate_costto estimate net tx cost for the end user
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DuniterAccountApi_estimate_costto estimate net tx cost for the end user
This MR adds a runtime API DuniterAccountApi_estimate_cost(tx) that estimates transaction fees and quota refunds. It returns an object with three fields:
// The estimated effective cost for the user (fees - refund)
cost: Balance,
// The estimated amount of fees for the extrinsic
fees: Balance,
// The estimated amount of refund from quota
refund: Balance,The implementation introduces a new trait, GetSigner, to extract the signer from the transaction. Substrate doesn’t provide a way to retrieve the signer without verifying the signature via the Checkable trait. To avoid unnecessary computation on the node side, this runtime API skips signature verification.
Closes #308 (closed)