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"""0x smart contract compilation artifacts."""
import json
from typing import Dict
from pkg_resources import resource_string
class _ArtifactCache:
"""A cache to facilitate lazy & singular loading of contract artifacts."""
_contract_name_to_abi: Dict[str, Dict] = {} # class data, not instance
@classmethod
def contract_name_to_abi(cls, contract_name: str) -> Dict:
"""Return the ABI for the given contract name.
First tries to get data from the class level storage
`_contract_name_to_abi`. If it's not there, loads it from disk, stores
it in the class data (for the next caller), and then returns it.
"""
try:
return cls._contract_name_to_abi[contract_name]
except KeyError:
cls._contract_name_to_abi[contract_name] = json.loads(
resource_string(
"zero_ex.contract_artifacts",
f"artifacts/{contract_name}.json",
)
)["compilerOutput"]["abi"]
return cls._contract_name_to_abi[contract_name]
def abi_by_name(contract_name: str) -> Dict:
"""Return the ABI for the named contract."""
return _ArtifactCache.contract_name_to_abi(contract_name)
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