# This is an automatically generated file.
# DO NOT EDIT or your changes may be overwritten
from __future__ import annotations
import base64
from xdrlib3 import Packer, Unpacker
from .node_id import NodeID
from .scp_statement_pledges import SCPStatementPledges
from .uint64 import Uint64
__all__ = ["SCPStatement"]
[docs]
class SCPStatement:
"""
XDR Source Code::
struct SCPStatement
{
NodeID nodeID; // v
uint64 slotIndex; // i
union switch (SCPStatementType type)
{
case SCP_ST_PREPARE:
struct
{
Hash quorumSetHash; // D
SCPBallot ballot; // b
SCPBallot* prepared; // p
SCPBallot* preparedPrime; // p'
uint32 nC; // c.n
uint32 nH; // h.n
} prepare;
case SCP_ST_CONFIRM:
struct
{
SCPBallot ballot; // b
uint32 nPrepared; // p.n
uint32 nCommit; // c.n
uint32 nH; // h.n
Hash quorumSetHash; // D
} confirm;
case SCP_ST_EXTERNALIZE:
struct
{
SCPBallot commit; // c
uint32 nH; // h.n
Hash commitQuorumSetHash; // D used before EXTERNALIZE
} externalize;
case SCP_ST_NOMINATE:
SCPNomination nominate;
}
pledges;
};
"""
def __init__(
self,
node_id: NodeID,
slot_index: Uint64,
pledges: SCPStatementPledges,
) -> None:
self.node_id = node_id
self.slot_index = slot_index
self.pledges = pledges
def pack(self, packer: Packer) -> None:
self.node_id.pack(packer)
self.slot_index.pack(packer)
self.pledges.pack(packer)
@classmethod
def unpack(cls, unpacker: Unpacker) -> SCPStatement:
node_id = NodeID.unpack(unpacker)
slot_index = Uint64.unpack(unpacker)
pledges = SCPStatementPledges.unpack(unpacker)
return cls(
node_id=node_id,
slot_index=slot_index,
pledges=pledges,
)
def to_xdr_bytes(self) -> bytes:
packer = Packer()
self.pack(packer)
return packer.get_buffer()
@classmethod
def from_xdr_bytes(cls, xdr: bytes) -> SCPStatement:
unpacker = Unpacker(xdr)
return cls.unpack(unpacker)
def to_xdr(self) -> str:
xdr_bytes = self.to_xdr_bytes()
return base64.b64encode(xdr_bytes).decode()
@classmethod
def from_xdr(cls, xdr: str) -> SCPStatement:
xdr_bytes = base64.b64decode(xdr.encode())
return cls.from_xdr_bytes(xdr_bytes)
def __hash__(self):
return hash(
(
self.node_id,
self.slot_index,
self.pledges,
)
)
def __eq__(self, other: object):
if not isinstance(other, self.__class__):
return NotImplemented
return (
self.node_id == other.node_id
and self.slot_index == other.slot_index
and self.pledges == other.pledges
)
def __str__(self):
out = [
f"node_id={self.node_id}",
f"slot_index={self.slot_index}",
f"pledges={self.pledges}",
]
return f"<SCPStatement [{', '.join(out)}]>"