The change selection algorithm has the most useful information for
determining whether or not a note is dust, so this adds a new error case
to `ChangeError` that allows the change selection to report the presence
of input notes without economic value back to its caller.
This adds a set of abstractions that allow wallets to provide
independent strategies for fee estimation and note selection, and
implementations of these strategies that perform these operations in the
same fashion as the existing `spend` and `shield_transparent_funds`
functions.
This required a somewhat hefty rework of the error handling in
zcash_client_backend. It fixes an issue with the error types whereby
callees needed to have a bit too much information about the error
types produced by their callers.
Reflect the updated note selection and error handling in zcash_client_sqlite.
This adds a fee calculation strategy abstraction that can be used to
dynamically compute fees so that the total fees required may be taken
taken into account during note selection, and also removes automatic
change creation from the transaction builder.
Change outputs must now be directly created by the caller by the caller.
This is a necessary prerequisite for permitting fees to adjust based
upon the contents of the transaction being constructed.
The initial implementation of the fee strategy simply uses the current
default fee.
Previously, `shield_transparent_funds` was only shielding funds
associated with the legacy default transparent address. This meant
that transparent funds sent to unified addresses could not reliably
be shielded, as a unified address will frequently be constructed
using a diversifier index greater than zero.
This modifies the `get_transparent_receivers` method to return address
metadata containing the account ID and diversifier index used to derive
each address along with the receiver.
As of zcash/librustzcash#633, `SaplingDomain::IncomingViewingKey` now
allocates memory internally, and this memory persists as long as the
`BatchRunner` is alive. Now that we have decoupled the measurement of
heap usage for batch tasks from their internals, we can add bounds to
all of the generic parameters of `Batch` to enable correctly measuring
their actual heap usage.
We also add `DynamicUsage` impls for a bunch of `zcash_primitives` types
that will be used with `BatchRunner` (or its equivalent implementation
in `zcashd`) by callers.
This was only used to provide example code for Sapling usage of
the `NoteEncryption` struct; this example code has been moved
to `sapling::note_encryption`.
This removes the dependency on `SaplingIvk::to_repr()`, and enables us
to alter the type of `D::IncomingViewingKey` to improve the performance
of batch scanning.
For the welding rig, we already annotate the viewing keys with
`AccountId`, so we use `(AccountId, Scope)` as the tag.
The `zcashd` Rust code relies on being able to construct the Sapling
types transparently. This part of the "public API" of the crate was
broken when the `NullifierDerivingKey` newtype was introduced. We do
want to migrate to all of these types having stronger type safety
guarantees (by only constructing them via constructors), but that should
be done consistently across the types. For now we maintain the existing
API by changing `NullifierDerivingKey` to be a transparent newtype.
This updates `shield_transparent_funds` to look up the internal
(change) address for the account specified, and use that as the
destination for shielding transparent funds.
Fixed#614
Kris Nuttycombe
str4d
Sean Bowe
Kris Nuttycombe
Daira Hopwood