68fa807256
- Add initial sleep before first proposal to prevent immediate block creation - Return bool from _propose_block to indicate if block was actually proposed - Wait for next slot only after successful proposal, use regular interval after skipped proposals - Add 1s sleep after proposal errors to prevent tight error loops - Add parent_hash, proposer, and state_root fields to /rpc/blocks-range response - Fix transaction field mapping
401 lines
17 KiB
Python
Executable File
401 lines
17 KiB
Python
Executable File
import asyncio
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import hashlib
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import json
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import re
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from datetime import datetime
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from pathlib import Path
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from typing import Callable, ContextManager, Optional
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from sqlmodel import Session, select
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from ..logger import get_logger
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from ..metrics import metrics_registry
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from ..config import ProposerConfig
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from ..models import Block, Account
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from ..gossip import gossip_broker
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_METRIC_KEY_SANITIZE = re.compile(r"[^a-zA-Z0-9_]")
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def _sanitize_metric_suffix(value: str) -> str:
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sanitized = _METRIC_KEY_SANITIZE.sub("_", value).strip("_")
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return sanitized or "unknown"
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import time
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class CircuitBreaker:
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def __init__(self, threshold: int, timeout: int):
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self._threshold = threshold
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self._timeout = timeout
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self._failures = 0
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self._last_failure_time = 0.0
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self._state = "closed"
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@property
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def state(self) -> str:
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if self._state == "open":
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if time.time() - self._last_failure_time > self._timeout:
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self._state = "half-open"
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return self._state
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def allow_request(self) -> bool:
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state = self.state
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if state == "closed":
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return True
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if state == "half-open":
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return True
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return False
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def record_failure(self) -> None:
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self._failures += 1
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self._last_failure_time = time.time()
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if self._failures >= self._threshold:
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self._state = "open"
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def record_success(self) -> None:
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self._failures = 0
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self._state = "closed"
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class PoAProposer:
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"""Proof-of-Authority block proposer.
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Responsible for periodically proposing blocks if this node is configured as a proposer.
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In the real implementation, this would involve checking the mempool, validating transactions,
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and signing the block.
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"""
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def __init__(
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self,
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*,
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config: ProposerConfig,
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session_factory: Callable[[], ContextManager[Session]],
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) -> None:
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self._config = config
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self._session_factory = session_factory
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self._logger = get_logger(__name__)
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self._stop_event = asyncio.Event()
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self._task: Optional[asyncio.Task[None]] = None
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self._last_proposer_id: Optional[str] = None
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async def start(self) -> None:
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if self._task is not None:
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return
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self._logger.info("Starting PoA proposer loop", extra={"interval": self._config.interval_seconds})
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await self._ensure_genesis_block()
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self._stop_event.clear()
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self._task = asyncio.create_task(self._run_loop())
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async def stop(self) -> None:
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if self._task is None:
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return
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self._logger.info("Stopping PoA proposer loop")
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self._stop_event.set()
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await self._task
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self._task = None
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async def _run_loop(self) -> None:
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# Initial sleep so we don't start proposing immediately
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await asyncio.sleep(self._config.interval_seconds)
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while not self._stop_event.is_set():
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if self._stop_event.is_set():
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break
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try:
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proposed = await self._propose_block()
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if proposed:
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await self._wait_until_next_slot()
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else:
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# If we skipped proposing, wait a regular interval
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try:
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await asyncio.wait_for(self._stop_event.wait(), timeout=self._config.interval_seconds)
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except asyncio.TimeoutError:
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pass
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except Exception as exc: # pragma: no cover - defensive logging
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self._logger.exception("Failed to propose block", extra={"error": str(exc)})
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await asyncio.sleep(1.0)
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async def _wait_until_next_slot(self) -> None:
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head = self._fetch_chain_head()
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if head is None:
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return
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now = datetime.utcnow()
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elapsed = (now - head.timestamp).total_seconds()
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sleep_for = max(self._config.interval_seconds - elapsed, 0.1)
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if sleep_for <= 0:
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sleep_for = 0.1
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try:
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await asyncio.wait_for(self._stop_event.wait(), timeout=sleep_for)
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except asyncio.TimeoutError:
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return
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async def _propose_block(self) -> bool:
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# Check internal mempool and include transactions
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from ..mempool import get_mempool
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from ..models import Transaction, Account
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from ..config import settings
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mempool = get_mempool()
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# Check if we should only propose when mempool is not empty
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if getattr(settings, "propose_only_if_mempool_not_empty", True):
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mempool_size = mempool.size(self._config.chain_id)
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if mempool_size == 0:
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self._logger.info(f"[PROPOSE] Skipping block proposal: mempool is empty (chain={self._config.chain_id})")
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return False
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with self._session_factory() as session:
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head = session.exec(select(Block).where(Block.chain_id == self._config.chain_id).order_by(Block.height.desc()).limit(1)).first()
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next_height = 0
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parent_hash = "0x00"
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interval_seconds: Optional[float] = None
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if head is not None:
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next_height = head.height + 1
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parent_hash = head.hash
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interval_seconds = (datetime.utcnow() - head.timestamp).total_seconds()
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timestamp = datetime.utcnow()
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# Pull transactions from mempool
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max_txs = self._config.max_txs_per_block
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max_bytes = self._config.max_block_size_bytes
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pending_txs = mempool.drain(max_txs, max_bytes, self._config.chain_id)
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self._logger.info(f"[PROPOSE] drained {len(pending_txs)} txs from mempool, chain={self._config.chain_id}")
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# Process transactions and update balances
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processed_txs = []
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for tx in pending_txs:
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try:
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# Parse transaction data
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tx_data = tx.content
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sender = tx_data.get("from")
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recipient = tx_data.get("to")
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value = tx_data.get("amount", 0)
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fee = tx_data.get("fee", 0)
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self._logger.info(f"[PROPOSE] Processing tx {tx.tx_hash}: from={sender}, to={recipient}, amount={value}, fee={fee}")
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if not sender or not recipient:
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self._logger.warning(f"[PROPOSE] Skipping tx {tx.tx_hash}: missing sender or recipient")
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continue
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# Get sender account
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sender_account = session.get(Account, (self._config.chain_id, sender))
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if not sender_account:
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self._logger.warning(f"[PROPOSE] Skipping tx {tx.tx_hash}: sender account not found for {sender}")
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continue
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# Check sufficient balance
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total_cost = value + fee
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if sender_account.balance < total_cost:
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self._logger.warning(f"[PROPOSE] Skipping tx {tx.tx_hash}: insufficient balance (has {sender_account.balance}, needs {total_cost})")
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continue
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# Get or create recipient account
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recipient_account = session.get(Account, (self._config.chain_id, recipient))
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if not recipient_account:
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self._logger.info(f"[PROPOSE] Creating recipient account for {recipient}")
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recipient_account = Account(chain_id=self._config.chain_id, address=recipient, balance=0, nonce=0)
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session.add(recipient_account)
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session.flush()
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else:
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self._logger.info(f"[PROPOSE] Recipient account exists for {recipient}")
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# Update balances
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sender_account.balance -= total_cost
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sender_account.nonce += 1
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recipient_account.balance += value
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# Check if transaction already exists in database
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existing_tx = session.exec(
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select(Transaction).where(
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Transaction.chain_id == self._config.chain_id,
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Transaction.tx_hash == tx.tx_hash
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)
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).first()
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if existing_tx:
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self._logger.warning(f"[PROPOSE] Skipping tx {tx.tx_hash}: already exists in database at block {existing_tx.block_height}")
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continue
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# Create transaction record
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transaction = Transaction(
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chain_id=self._config.chain_id,
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tx_hash=tx.tx_hash,
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sender=sender,
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recipient=recipient,
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payload=tx_data,
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value=value,
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fee=fee,
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nonce=sender_account.nonce - 1,
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timestamp=timestamp,
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block_height=next_height,
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status="confirmed"
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)
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session.add(transaction)
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processed_txs.append(tx)
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self._logger.info(f"[PROPOSE] Successfully processed tx {tx.tx_hash}: updated balances")
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except Exception as e:
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self._logger.warning(f"Failed to process transaction {tx.tx_hash}: {e}")
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continue
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# Compute block hash with transaction data
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block_hash = self._compute_block_hash(next_height, parent_hash, timestamp, processed_txs)
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block = Block(
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chain_id=self._config.chain_id,
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height=next_height,
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hash=block_hash,
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parent_hash=parent_hash,
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proposer=self._config.proposer_id,
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timestamp=timestamp,
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tx_count=len(processed_txs),
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state_root=None,
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)
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session.add(block)
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session.commit()
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metrics_registry.increment("blocks_proposed_total")
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metrics_registry.set_gauge("chain_head_height", float(next_height))
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if interval_seconds is not None and interval_seconds >= 0:
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metrics_registry.observe("block_interval_seconds", interval_seconds)
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metrics_registry.set_gauge("poa_last_block_interval_seconds", float(interval_seconds))
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proposer_suffix = _sanitize_metric_suffix(self._config.proposer_id)
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metrics_registry.increment(f"poa_blocks_proposed_total_{proposer_suffix}")
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if self._last_proposer_id is not None and self._last_proposer_id != self._config.proposer_id:
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metrics_registry.increment("poa_proposer_switches_total")
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self._last_proposer_id = self._config.proposer_id
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self._logger.info(
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"Proposed block",
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extra={
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"height": block.height,
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"hash": block.hash,
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"proposer": block.proposer,
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},
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)
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# Broadcast the new block
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tx_list = [tx.content for tx in processed_txs] if processed_txs else []
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await gossip_broker.publish(
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"blocks",
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{
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"chain_id": self._config.chain_id,
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"height": block.height,
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"hash": block.hash,
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"parent_hash": block.parent_hash,
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"proposer": block.proposer,
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"timestamp": block.timestamp.isoformat(),
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"tx_count": block.tx_count,
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"state_root": block.state_root,
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"transactions": tx_list,
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},
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)
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return True
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async def _ensure_genesis_block(self) -> None:
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with self._session_factory() as session:
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# Check if genesis block already exists
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genesis = session.exec(select(Block).where(Block.chain_id == self._config.chain_id).where(Block.height == 0).limit(1)).first()
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if genesis is not None:
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self._logger.info(f"Genesis block already exists: height={genesis.height}, hash={genesis.hash}, proposer={genesis.proposer}")
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return
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# Use a deterministic genesis timestamp so all nodes agree on the genesis block hash
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timestamp = datetime(2025, 1, 1, 0, 0, 0)
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block_hash = self._compute_block_hash(0, "0x00", timestamp)
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# Check if block with this hash already exists (duplicate check)
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existing = session.exec(select(Block).where(Block.chain_id == self._config.chain_id).where(Block.hash == block_hash).limit(1)).first()
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if existing is not None:
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self._logger.info(f"Genesis block with hash {block_hash} already exists, skipping creation")
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return
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genesis = Block(
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chain_id=self._config.chain_id,
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height=0,
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hash=block_hash,
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parent_hash="0x00",
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proposer="genesis", # Use "genesis" as the proposer for genesis block to avoid hash conflicts
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timestamp=timestamp,
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tx_count=0,
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state_root=None,
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)
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session.add(genesis)
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try:
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session.commit()
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except Exception as e:
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self._logger.warning(f"Failed to create genesis block: {e}")
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session.rollback()
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return
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# Initialize accounts from genesis allocations file (if present)
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await self._initialize_genesis_allocations(session)
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# Broadcast genesis block for initial sync
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await gossip_broker.publish(
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"blocks",
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{
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"chain_id": self._config.chain_id,
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"height": genesis.height,
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"hash": genesis.hash,
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"parent_hash": genesis.parent_hash,
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"proposer": genesis.proposer,
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"timestamp": genesis.timestamp.isoformat(),
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"tx_count": genesis.tx_count,
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"state_root": genesis.state_root,
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}
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)
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async def _initialize_genesis_allocations(self, session: Session) -> None:
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"""Create Account entries from the genesis allocations file."""
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# Use standardized data directory from configuration
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from ..config import settings
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genesis_paths = [
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Path(f"/var/lib/aitbc/data/{self._config.chain_id}/genesis.json"), # Standard location
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]
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genesis_path = None
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for path in genesis_paths:
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if path.exists():
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genesis_path = path
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break
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if not genesis_path:
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self._logger.warning("Genesis allocations file not found; skipping account initialization", extra={"paths": str(genesis_paths)})
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return
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with open(genesis_path) as f:
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genesis_data = json.load(f)
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allocations = genesis_data.get("allocations", [])
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created = 0
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for alloc in allocations:
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addr = alloc["address"]
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balance = int(alloc["balance"])
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nonce = int(alloc.get("nonce", 0))
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# Check if account already exists (idempotent)
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acct = session.get(Account, (self._config.chain_id, addr))
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if acct is None:
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acct = Account(chain_id=self._config.chain_id, address=addr, balance=balance, nonce=nonce)
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session.add(acct)
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created += 1
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session.commit()
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self._logger.info("Initialized genesis accounts", extra={"count": created, "total": len(allocations), "path": str(genesis_path)})
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def _fetch_chain_head(self) -> Optional[Block]:
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with self._session_factory() as session:
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return session.exec(select(Block).order_by(Block.height.desc()).limit(1)).first()
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def _compute_block_hash(self, height: int, parent_hash: str, timestamp: datetime, transactions: list = None) -> str:
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# Include transaction hashes in block hash computation
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tx_hashes = []
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if transactions:
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tx_hashes = [tx.tx_hash for tx in transactions]
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payload = f"{self._config.chain_id}|{height}|{parent_hash}|{timestamp.isoformat()}|{'|'.join(sorted(tx_hashes))}".encode()
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return "0x" + hashlib.sha256(payload).hexdigest()
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