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EIP-7594: PeerDAS explicit csc integer size #3897

Merged
merged 14 commits into from
Aug 28, 2024
2 changes: 1 addition & 1 deletion scripts/build_run_docker_tests.sh
Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@


# Set variables
ALL_EXECUTABLE_SPECS=("phase0" "altair" "bellatrix" "capella" "deneb" "electra" "whisk")
ALL_EXECUTABLE_SPECS=("phase0" "altair" "bellatrix" "capella" "deneb" "electra" "whisk" "eip7594")
TEST_PRESET_TYPE=minimal
FORK_TO_TEST=phase0
WORKDIR="//consensus-specs//tests//core//pyspec"
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12 changes: 6 additions & 6 deletions specs/_features/eip7594/das-core.md
Original file line number Diff line number Diff line change
Expand Up @@ -67,7 +67,7 @@ The following values are (non-configurable) constants used throughout the specif

| Name | Value | Description |
| - | - | - |
| `DATA_COLUMN_SIDECAR_SUBNET_COUNT` | `128` | The number of data column sidecar subnets used in the gossipsub protocol |
| `DATA_COLUMN_SIDECAR_SUBNET_COUNT` | `uint8(128)` | The number of data column sidecar subnets used in the gossipsub protocol |

### Custody setting

Expand Down Expand Up @@ -105,15 +105,15 @@ class MatrixEntry(Container):
### `get_custody_columns`

```python
def get_custody_columns(node_id: NodeID, custody_subnet_count: uint64) -> Sequence[ColumnIndex]:
def get_custody_columns(node_id: NodeID, custody_subnet_count: uint8) -> Sequence[ColumnIndex]:
assert custody_subnet_count <= DATA_COLUMN_SIDECAR_SUBNET_COUNT

subnet_ids: List[uint64] = []
current_id = uint256(node_id)
while len(subnet_ids) < custody_subnet_count:
subnet_id = (
bytes_to_uint64(hash(uint_to_bytes(uint256(current_id)))[0:8])
% DATA_COLUMN_SIDECAR_SUBNET_COUNT
% int(DATA_COLUMN_SIDECAR_SUBNET_COUNT)
)
if subnet_id not in subnet_ids:
subnet_ids.append(subnet_id)
Expand All @@ -124,9 +124,9 @@ def get_custody_columns(node_id: NodeID, custody_subnet_count: uint64) -> Sequen

assert len(subnet_ids) == len(set(subnet_ids))

columns_per_subnet = NUMBER_OF_COLUMNS // DATA_COLUMN_SIDECAR_SUBNET_COUNT
columns_per_subnet = NUMBER_OF_COLUMNS // int(DATA_COLUMN_SIDECAR_SUBNET_COUNT)
return sorted([
ColumnIndex(DATA_COLUMN_SIDECAR_SUBNET_COUNT * i + subnet_id)
ColumnIndex(int(DATA_COLUMN_SIDECAR_SUBNET_COUNT) * i + subnet_id)
for i in range(columns_per_subnet)
for subnet_id in subnet_ids
])
Expand Down Expand Up @@ -222,7 +222,7 @@ def get_data_column_sidecars(signed_block: SignedBeaconBlock,

Each node downloads and custodies a minimum of `CUSTODY_REQUIREMENT` subnets per slot. The particular subnets that the node is required to custody are selected pseudo-randomly (more on this below).

A node *may* choose to custody and serve more than the minimum honesty requirement. Such a node explicitly advertises a number greater than `CUSTODY_REQUIREMENT` via the peer discovery mechanism -- for example, in their ENR (e.g. `custody_subnet_count: 4` if the node custodies `4` subnets each slot) -- up to a `DATA_COLUMN_SIDECAR_SUBNET_COUNT` (i.e. a super-full node).
A node *may* choose to custody and serve more than the minimum honesty requirement. Such a node explicitly advertises a number greater than `CUSTODY_REQUIREMENT` through the peer discovery mechanism, specifically by setting a higher value in the `custody_subnet_count` field within its ENR. This value can be increased up to `DATA_COLUMN_SIDECAR_SUBNET_COUNT`, indicating a super-full node.

A node stores the custodied columns for the duration of the pruning period and responds to peer requests for samples on those columns.

Expand Down
10 changes: 5 additions & 5 deletions specs/_features/eip7594/p2p-interface.md
Original file line number Diff line number Diff line change
Expand Up @@ -119,14 +119,14 @@ The `MetaData` stored locally by clients is updated with an additional field to
seq_number: uint64
attnets: Bitvector[ATTESTATION_SUBNET_COUNT]
syncnets: Bitvector[SYNC_COMMITTEE_SUBNET_COUNT]
custody_subnet_count: uint64
custody_subnet_count: uint8 # csc
)
```

Where

- `seq_number`, `attnets`, and `syncnets` have the same meaning defined in the Altair document.
- `custody_subnet_count` represents the node's custody subnet count. Clients MAY reject ENRs with a value less than `CUSTODY_REQUIREMENT`.
- `csc` represents the node's custody subnet count. Clients MAY reject ENRs with a value less than `CUSTODY_REQUIREMENT`.

### The gossip domain: gossipsub

Expand Down Expand Up @@ -322,6 +322,6 @@ Requests the MetaData of a peer, using the new `MetaData` definition given above

A new field is added to the ENR under the key `csc` to facilitate custody data column discovery.

| Key | Value |
|--------|------------------------------------------|
| `csc` | Custody subnet count, big endian integer |
| Key | Value |
|--------|-------------------------------------|
| `csc` | Custody subnet count, uint8 integer |
Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
spec_test,
with_eip7594_and_later,
)
from eth2spec.utils.ssz.ssz_typing import uint8


@with_eip7594_and_later
Expand All @@ -12,9 +13,10 @@ def test_invariants(spec):
assert spec.FIELD_ELEMENTS_PER_BLOB % spec.FIELD_ELEMENTS_PER_CELL == 0
assert spec.FIELD_ELEMENTS_PER_EXT_BLOB % spec.config.NUMBER_OF_COLUMNS == 0
assert spec.config.SAMPLES_PER_SLOT <= spec.config.NUMBER_OF_COLUMNS
assert spec.config.NUMBER_OF_COLUMNS == uint8(spec.config.NUMBER_OF_COLUMNS) # ENR field is uint8
assert spec.config.CUSTODY_REQUIREMENT <= spec.config.DATA_COLUMN_SIDECAR_SUBNET_COUNT
assert spec.config.DATA_COLUMN_SIDECAR_SUBNET_COUNT <= spec.config.NUMBER_OF_COLUMNS
assert spec.config.NUMBER_OF_COLUMNS % spec.config.DATA_COLUMN_SIDECAR_SUBNET_COUNT == 0
assert spec.config.NUMBER_OF_COLUMNS % int(spec.config.DATA_COLUMN_SIDECAR_SUBNET_COUNT) == 0
assert spec.config.MAX_REQUEST_DATA_COLUMN_SIDECARS == (
spec.config.MAX_REQUEST_BLOCKS_DENEB * spec.config.NUMBER_OF_COLUMNS
)
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Original file line number Diff line number Diff line change
Expand Up @@ -9,9 +9,9 @@
def run_get_custody_columns(spec, peer_count, custody_subnet_count):
assignments = [spec.get_custody_columns(node_id, custody_subnet_count) for node_id in range(peer_count)]

columns_per_subnet = spec.config.NUMBER_OF_COLUMNS // spec.config.DATA_COLUMN_SIDECAR_SUBNET_COUNT
columns_per_subnet = spec.config.NUMBER_OF_COLUMNS // int(spec.config.DATA_COLUMN_SIDECAR_SUBNET_COUNT)
for assignment in assignments:
assert len(assignment) == custody_subnet_count * columns_per_subnet
assert len(assignment) == int(custody_subnet_count) * columns_per_subnet
assert len(assignment) == len(set(assignment))


Expand Down
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