jam.types.extrinsics.assurances module

class jam.types.extrinsics.assurances.AvailBitField(value: int | bool | bytes | str | bytearray | memoryview | Sequence)[source]

Bases: BitArray

static decode_from(buffer: bytes | bytearray | memoryview, offset: int = 0) → Tuple[BitArray, int]

Decode from buffer. Must be implemented by subclasses or added via decorator.

Parameters:

  • buffer – Buffer to decode from

  • offset – Starting position in buffer

Returns:

  • The decoded value

  • Number of bytes read

Return type:

Tuple containing

class jam.types.extrinsics.assurances.AvailAssurance(anchor: ByteArray32, bitfield: AvailBitField, validator_index: U16, signature: ByteArray64)[source]

Bases: Codable, JsonSerde

Availability assurance structure.

anchor: ByteArray32
bitfield: AvailBitField
validator_index: U16
signature: ByteArray64
__init__(anchor: ByteArray32, bitfield: AvailBitField, validator_index: U16, signature: ByteArray64) → None

Initialize the Codable.

Parameters:

  • codec – Optional codec to use for encoding/decoding

  • enc_sequence – Optional function that returns sequence of fields to encode

static decode_from(buffer: bytes | bytearray | memoryview, offset: int = 0) → Tuple[T, int]

Decode from buffer. Must be implemented by subclasses or added via decorator.

Parameters:

  • buffer – Buffer to decode from

  • offset – Starting position in buffer

Returns:

  • The decoded value

  • Number of bytes read

Return type:

Tuple containing

encode_into(buffer: bytearray, offset: int = 0) → int

Encode into provided buffer.

encode_size() → int

Calculate number of bytes needed to encode.

class jam.types.extrinsics.assurances.AssurancesExtrinsic(initial: Sequence[T] = [], codec: Codec[T] | None = None)[source]

Bases: Vector[AvailAssurance]

static decode_from(buffer: bytes | bytearray | memoryview, offset: int = 0) → Tuple[Vector[T], int]

Decode from buffer. Must be implemented by subclasses or added via decorator.

Parameters:

  • buffer – Buffer to decode from

  • offset – Starting position in buffer

Returns:

  • The decoded value

  • Number of bytes read

Return type:

Tuple containing