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wallet-core: enable WASM host to calc balance for a profile
- Add `map_owned` FFI - Add `balance` FFI - Add `OwnedList` serializable type - Add `ErrorCode` usage - Move `map_owned` in `notes` module with `OwnedList` Resolves #2317
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,92 @@ | ||
| // This Source Code Form is subject to the terms of the Mozilla Public | ||
| // License, v. 2.0. If a copy of the MPL was not distributed with this | ||
| // file, You can obtain one at http://mozilla.org/MPL/2.0/. | ||
| // | ||
| // Copyright (c) DUSK NETWORK. All rights reserved. | ||
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| //! Implementations of basic wallet functionalities to create transactions. | ||
| use alloc::vec::Vec; | ||
| use core::ops::Index; | ||
| use execution_core::{ | ||
| transfer::phoenix::{NoteLeaf, SecretKey as PhoenixSecretKey}, | ||
| BlsScalar, | ||
| }; | ||
|
|
||
| use rkyv::{Archive, Deserialize, Serialize}; | ||
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| /// A collection of notes stored as key-value pairs. | ||
| /// The key is a `BlsScalar` and the value is a `NoteLeaf`. | ||
| /// Duplicates are allowed. | ||
| #[derive(Default, Archive, Serialize, Deserialize, Debug)] | ||
| pub struct OwnedList { | ||
| /// The underlying storage of key-value pairs where | ||
| /// `BlsScalar` is the key and `NoteLeaf` is the value. | ||
| entries: Vec<(BlsScalar, NoteLeaf)>, | ||
| } | ||
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| impl OwnedList { | ||
| /// Inserts a new key-value pair into the collection. | ||
| pub fn insert(&mut self, key: BlsScalar, value: NoteLeaf) { | ||
| self.entries.push((key, value)); | ||
| } | ||
|
|
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| /// Returns the number of entries (key-value pairs) in the collection. | ||
| #[must_use] | ||
| pub fn len(&self) -> usize { | ||
| self.entries.len() | ||
| } | ||
|
|
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| /// Checks if the collection is empty. | ||
| #[must_use] | ||
| pub fn is_empty(&self) -> bool { | ||
| self.entries.is_empty() | ||
| } | ||
|
|
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| /// Retrieves the value (`NoteLeaf`) associated with a given key | ||
| #[must_use] | ||
| pub fn get(&self, key: &BlsScalar) -> Option<&NoteLeaf> { | ||
| self.entries.iter().find(|(k, _)| k == key).map(|(_, v)| v) | ||
| } | ||
|
|
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| /// Retrieves all keys in the collection. | ||
| #[must_use] | ||
| pub fn keys(&self) -> Vec<BlsScalar> { | ||
| self.entries.iter().map(|(k, _)| *k).collect() | ||
| } | ||
| } | ||
|
|
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| impl Index<&BlsScalar> for OwnedList { | ||
| type Output = NoteLeaf; | ||
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| /// Retrieves the value (`NoteLeaf`) associated with a given key | ||
| /// (`BlsScalar`). | ||
| /// | ||
| /// Panics if the key is not found in the collection. | ||
| fn index(&self, index: &BlsScalar) -> &Self::Output { | ||
| self.get(index).expect("key not found") | ||
| } | ||
| } | ||
|
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| /// Filter all notes and their block height that are owned by the given keys, | ||
| /// mapped to their nullifiers. | ||
| pub fn map_owned( | ||
| keys: impl AsRef<[PhoenixSecretKey]>, | ||
| notes: impl AsRef<[NoteLeaf]>, | ||
| ) -> OwnedList { | ||
| notes.as_ref().iter().fold( | ||
| OwnedList::default(), | ||
| |mut notes_map, note_leaf| { | ||
| eprintln!("Printing note..."); | ||
| dbg!(note_leaf); | ||
| for sk in keys.as_ref() { | ||
| if sk.owns(note_leaf.note.stealth_address()) { | ||
| let nullifier = note_leaf.note.gen_nullifier(sk); | ||
| notes_map.insert(nullifier, note_leaf.clone()); | ||
| break; | ||
| } | ||
| } | ||
| notes_map | ||
| }, | ||
| ) | ||
| } |