0xc1a44978…ad58sent to0xb7278a61…e575·#24,777,492·0xf4c759b1…4aaead
# v0.2.16
# { "Depends": "py-genlayer:1jb45aa8ynh2a9c9xn3b7qqh8sm5q93hwfp7jqmwsfhh8jpz09h6" }
# Always put above lines as first in the contract file
# v0.1.2 is genvm ABI version, lower versions may restrict some calls that were introduced in newer version (i.e. events)
# In actual genlayer network `:latest` is not allowed and hash must be specified
# this imports all types into globals and `genlayer.std` as `gl` (will be imported lazily on first access)
from genlayer import *
# extend `gl.Contract` to mark class as a contract. There can be only one class that extends `gl.Contract`
class Storage(gl.Contract):
# below you must declare all class fields that you are going to use
# this fields persist between contract calls
storage_str: str
storage_int: u256 # NOTE: `int`s are intentionally not supported! in future `bigint` int alias will be introduced
# all public methods must have type annotations to be user friendly
# constructor, must not be public
def __init__(self, initial_str_storage: str):
self.storage_str = initial_str_storage
# methods that don't modify anything must be annotated with view
@gl.public.view
def get_storage(self) -> str:
return self.storage_str
# keyword arguments are supported as well, however, they should not be mixed with positional,
# in python terms it means that function has following signature (note `/`)
# def debug(self, x: int, /, *, flag: bool) -> str:
@gl.public.view
def debug(self, x: int, *, flag: bool) -> None:
# you can use prints for debugging (even in write methods and non deterministic blocks)
# however, stdout doesn't go through consensus and is meant for debug use only
# it also may be absent in the actual node
print(f"debug: {self.storage_int}, {x}, {flag}")
# methods that modify storage must be annotated with write
@gl.public.write
def update_storage(self, new_storage: str) -> None:
self.storage_str = new_storage