2019-04-15 01:14:30 +00:00
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[package]
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name = "tree_hash"
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2021-11-29 03:57:54 +00:00
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version = "0.4.1"
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2019-04-15 01:14:30 +00:00
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authors = ["Paul Hauner <paul@paulhauner.com>"]
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2022-02-25 00:10:17 +00:00
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edition = "2021"
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2019-08-08 01:39:47 +00:00
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license = "Apache-2.0"
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description = "Efficient Merkle-hashing as used in Ethereum 2.0"
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2019-04-15 01:14:30 +00:00
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2019-04-21 02:12:47 +00:00
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[dev-dependencies]
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2022-04-04 00:26:16 +00:00
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rand = "0.8.5"
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Implement SSZ union type (#2579)
## Issue Addressed
NA
## Proposed Changes
Implements the "union" type from the SSZ spec for `ssz`, `ssz_derive`, `tree_hash` and `tree_hash_derive` so it may be derived for `enums`:
https://github.com/ethereum/consensus-specs/blob/v1.1.0-beta.3/ssz/simple-serialize.md#union
The union type is required for the merge, since the `Transaction` type is defined as a single-variant union `Union[OpaqueTransaction]`.
### Crate Updates
This PR will (hopefully) cause CI to publish new versions for the following crates:
- `eth2_ssz_derive`: `0.2.1` -> `0.3.0`
- `eth2_ssz`: `0.3.0` -> `0.4.0`
- `eth2_ssz_types`: `0.2.0` -> `0.2.1`
- `tree_hash`: `0.3.0` -> `0.4.0`
- `tree_hash_derive`: `0.3.0` -> `0.4.0`
These these crates depend on each other, I've had to add a workspace-level `[patch]` for these crates. A follow-up PR will need to remove this patch, ones the new versions are published.
### Union Behaviors
We already had SSZ `Encode` and `TreeHash` derive for enums, however it just did a "transparent" pass-through of the inner value. Since the "union" decoding from the spec is in conflict with the transparent method, I've required that all `enum` have exactly one of the following enum-level attributes:
#### SSZ
- `#[ssz(enum_behaviour = "union")]`
- matches the spec used for the merge
- `#[ssz(enum_behaviour = "transparent")]`
- maintains existing functionality
- not supported for `Decode` (never was)
#### TreeHash
- `#[tree_hash(enum_behaviour = "union")]`
- matches the spec used for the merge
- `#[tree_hash(enum_behaviour = "transparent")]`
- maintains existing functionality
This means that we can maintain the existing transparent behaviour, but all existing users will get a compile-time error until they explicitly opt-in to being transparent.
### Legacy Option Encoding
Before this PR, we already had a union-esque encoding for `Option<T>`. However, this was with the *old* SSZ spec where the union selector was 4 bytes. During merge specification, the spec was changed to use 1 byte for the selector.
Whilst the 4-byte `Option` encoding was never used in the spec, we used it in our database. Writing a migrate script for all occurrences of `Option` in the database would be painful, especially since it's used in the `CommitteeCache`. To avoid the migrate script, I added a serde-esque `#[ssz(with = "module")]` field-level attribute to `ssz_derive` so that we can opt into the 4-byte encoding on a field-by-field basis.
The `ssz::legacy::four_byte_impl!` macro allows a one-liner to define the module required for the `#[ssz(with = "module")]` for some `Option<T> where T: Encode + Decode`.
Notably, **I have removed `Encode` and `Decode` impls for `Option`**. I've done this to force a break on downstream users. Like I mentioned, `Option` isn't used in the spec so I don't think it'll be *that* annoying. I think it's nicer than quietly having two different union implementations or quietly breaking the existing `Option` impl.
### Crate Publish Ordering
I've modified the order in which CI publishes crates to ensure that we don't publish a crate without ensuring we already published a crate that it depends upon.
## TODO
- [ ] Queue a follow-up `[patch]`-removing PR.
2021-09-25 05:58:36 +00:00
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tree_hash_derive = "0.4.0"
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2020-05-18 11:24:23 +00:00
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types = { path = "../types" }
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2021-07-09 06:15:32 +00:00
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beacon_chain = { path = "../../beacon_node/beacon_chain" }
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2021-11-29 03:57:54 +00:00
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eth2_ssz = "0.4.1"
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2022-11-02 14:30:41 +00:00
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eth2_ssz_derive = "0.3.1"
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2019-04-21 02:12:47 +00:00
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2019-04-15 01:14:30 +00:00
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[dependencies]
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2023-01-09 03:11:59 +00:00
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ethereum-types = "0.14.1"
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2022-04-04 00:26:16 +00:00
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eth2_hashing = "0.3.0"
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2021-01-11 23:32:11 +00:00
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smallvec = "1.6.1"
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2020-05-05 23:12:28 +00:00
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[features]
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arbitrary = ["ethereum-types/arbitrary"]
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