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https://github.com/NousResearch/hermes-agent.git
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ffefd57719
Phase 2 of the wallet architecture — crypto wallet functionality built on top of the keystore. Core components: - wallet/manager.py: Wallet CRUD, balance checks, transaction execution. Private keys stored as sealed keystore secrets — only the manager reads them, and only to pass to chain providers for signing. - wallet/policy.py: Transaction policy engine with spending limits, daily limits, rate limits, cooldown, recipient allow/blocklists, approval thresholds, and a kill switch (freeze/unfreeze). - wallet/chains/: Abstract ChainProvider interface + EVM and Solana impls. EVM supports Ethereum, Base, Polygon, Arbitrum, Optimism + testnets. Solana supports mainnet + devnet. Agent integration: - tools/wallet_tool.py: 5 agent-facing tools (wallet_list, wallet_balance, wallet_send, wallet_history, wallet_estimate_gas). All return JSON, none expose private keys. wallet_send goes through the policy engine. - toolsets.py: New 'wallet' toolset - model_tools.py: wallet_tool added to discovery list CLI: - wallet/cli.py: Full CLI — create, create-agent, import, list, balance, send (with interactive confirmation), fund, history, freeze, unfreeze, status - hermes_cli/main.py: 'hermes wallet' subcommand registered Policy defaults: - Agent wallets: 1.0 native/tx max, 5.0/day, 5 txns/hour, 30s cooldown, approval required above 0.5 native - User wallets: owner approval required for all transactions Tests: 100 passing (28 wallet + 72 keystore)
242 lines
7.8 KiB
Python
242 lines
7.8 KiB
Python
"""EVM chain provider — Ethereum, Base, Polygon, Arbitrum, etc.
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Uses eth-account for key management/signing and web3.py for RPC.
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All EVM chains share this single provider with different ChainConfig.
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"""
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import logging
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from decimal import Decimal
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from typing import Optional
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from wallet.chains import (
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Balance,
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ChainConfig,
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ChainProvider,
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GasEstimate,
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TransactionResult,
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)
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logger = logging.getLogger(__name__)
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try:
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from eth_account import Account
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from web3 import Web3
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_WEB3_AVAILABLE = True
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except ImportError:
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_WEB3_AVAILABLE = False
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# ---------------------------------------------------------------------------
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# Pre-built chain configs
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# ---------------------------------------------------------------------------
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EVM_CHAINS = {
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"ethereum": ChainConfig(
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chain_id="ethereum",
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display_name="Ethereum Mainnet",
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symbol="ETH",
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decimals=18,
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rpc_url="https://eth.llamarpc.com",
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explorer_url="https://etherscan.io",
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),
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"ethereum-sepolia": ChainConfig(
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chain_id="ethereum-sepolia",
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display_name="Ethereum Sepolia (Testnet)",
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symbol="ETH",
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decimals=18,
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rpc_url="https://rpc.sepolia.org",
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explorer_url="https://sepolia.etherscan.io",
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is_testnet=True,
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),
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"base": ChainConfig(
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chain_id="base",
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display_name="Base",
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symbol="ETH",
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decimals=18,
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rpc_url="https://mainnet.base.org",
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explorer_url="https://basescan.org",
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),
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"base-sepolia": ChainConfig(
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chain_id="base-sepolia",
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display_name="Base Sepolia (Testnet)",
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symbol="ETH",
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decimals=18,
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rpc_url="https://sepolia.base.org",
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explorer_url="https://sepolia.basescan.org",
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is_testnet=True,
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),
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"polygon": ChainConfig(
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chain_id="polygon",
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display_name="Polygon",
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symbol="POL",
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decimals=18,
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rpc_url="https://polygon-rpc.com",
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explorer_url="https://polygonscan.com",
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),
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"arbitrum": ChainConfig(
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chain_id="arbitrum",
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display_name="Arbitrum One",
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symbol="ETH",
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decimals=18,
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rpc_url="https://arb1.arbitrum.io/rpc",
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explorer_url="https://arbiscan.io",
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),
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"optimism": ChainConfig(
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chain_id="optimism",
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display_name="Optimism",
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symbol="ETH",
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decimals=18,
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rpc_url="https://mainnet.optimism.io",
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explorer_url="https://optimistic.etherscan.io",
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),
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}
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# EVM chain IDs (for transaction signing)
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_CHAIN_IDS = {
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"ethereum": 1,
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"ethereum-sepolia": 11155111,
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"base": 8453,
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"base-sepolia": 84532,
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"polygon": 137,
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"arbitrum": 42161,
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"optimism": 10,
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}
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class EVMProvider(ChainProvider):
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"""Provider for all EVM-compatible chains."""
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def __init__(self, config: ChainConfig, rpc_url_override: str = ""):
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if not _WEB3_AVAILABLE:
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raise ImportError(
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"web3 and eth-account are required for EVM wallet support. "
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"Install with: pip install 'hermes-agent[wallet]'"
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)
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super().__init__(config)
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url = rpc_url_override or config.rpc_url
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self._w3 = Web3(Web3.HTTPProvider(url))
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self._evm_chain_id = _CHAIN_IDS.get(config.chain_id)
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def get_balance(self, address: str) -> Balance:
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checksum = Web3.to_checksum_address(address)
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balance_wei = self._w3.eth.get_balance(checksum)
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balance_eth = Decimal(balance_wei) / Decimal(10 ** self.config.decimals)
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return Balance(
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chain=self.config.chain_id,
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address=address,
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balance=balance_eth,
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balance_raw=balance_wei,
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symbol=self.config.symbol,
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decimals=self.config.decimals,
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)
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def send_transaction(
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self,
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from_private_key: str,
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to_address: str,
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amount: Decimal,
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) -> TransactionResult:
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account = Account.from_key(from_private_key)
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to_checksum = Web3.to_checksum_address(to_address)
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amount_wei = int(amount * Decimal(10 ** self.config.decimals))
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try:
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nonce = self._w3.eth.get_transaction_count(account.address)
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# Build transaction
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tx = {
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"to": to_checksum,
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"value": amount_wei,
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"nonce": nonce,
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"chainId": self._evm_chain_id,
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}
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# Use EIP-1559 if supported, otherwise legacy
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try:
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latest = self._w3.eth.get_block("latest")
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if hasattr(latest, "baseFeePerGas") and latest.baseFeePerGas is not None:
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# EIP-1559
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max_priority = self._w3.eth.max_priority_fee
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base_fee = latest.baseFeePerGas
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tx["maxFeePerGas"] = base_fee * 2 + max_priority
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tx["maxPriorityFeePerGas"] = max_priority
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else:
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tx["gasPrice"] = self._w3.eth.gas_price
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except Exception:
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tx["gasPrice"] = self._w3.eth.gas_price
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# Estimate gas
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tx["gas"] = self._w3.eth.estimate_gas(tx)
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# Sign and send
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signed = self._w3.eth.account.sign_transaction(tx, from_private_key)
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tx_hash = self._w3.eth.send_raw_transaction(signed.raw_transaction)
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tx_hash_hex = tx_hash.hex()
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logger.info("Transaction sent: %s on %s", tx_hash_hex, self.config.chain_id)
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return TransactionResult(
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tx_hash=tx_hash_hex,
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chain=self.config.chain_id,
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status="submitted",
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explorer_url=self.explorer_tx_url(tx_hash_hex),
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)
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except Exception as e:
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logger.error("Transaction failed on %s: %s", self.config.chain_id, e)
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return TransactionResult(
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tx_hash="",
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chain=self.config.chain_id,
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status="failed",
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error=str(e),
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)
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def estimate_fee(self, from_address: str, to_address: str, amount: Decimal) -> GasEstimate:
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from_checksum = Web3.to_checksum_address(from_address)
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to_checksum = Web3.to_checksum_address(to_address)
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amount_wei = int(amount * Decimal(10 ** self.config.decimals))
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try:
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gas_limit = self._w3.eth.estimate_gas({
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"from": from_checksum,
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"to": to_checksum,
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"value": amount_wei,
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})
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gas_price = self._w3.eth.gas_price
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fee_wei = gas_limit * gas_price
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fee_eth = Decimal(fee_wei) / Decimal(10 ** self.config.decimals)
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return GasEstimate(
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chain=self.config.chain_id,
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estimated_fee=fee_eth,
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estimated_fee_raw=fee_wei,
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symbol=self.config.symbol,
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)
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except Exception as e:
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# Return a rough estimate on failure
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rough_fee = Decimal("0.0005") # ~21000 gas * ~24 gwei
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return GasEstimate(
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chain=self.config.chain_id,
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estimated_fee=rough_fee,
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estimated_fee_raw=int(rough_fee * Decimal(10 ** 18)),
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symbol=self.config.symbol,
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)
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def validate_address(self, address: str) -> bool:
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try:
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Web3.to_checksum_address(address)
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return True
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except (ValueError, Exception):
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return False
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def generate_keypair(self) -> tuple[str, str]:
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"""Generate a new EVM keypair. Returns (address, private_key_hex)."""
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account = Account.create()
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return account.address, account.key.hex()
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@staticmethod
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def address_from_key(private_key: str) -> str:
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"""Derive address from a private key."""
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account = Account.from_key(private_key)
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return account.address
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