<h1 align="center">How to Upgrade Smart Contract</h1>
<p align="center" class="version">Version 0.1</p>
1. Introduction
API | Return Value | Description |
---|---|---|
Destroy | none | Destroy a smart contract |
Migrate | bool | Upgrade a smart contract. The existing contract will be replaced by the newly migrated contract |
For more details, you can view the API-doc and the source code here.
2. Destroy
The existing contract will be deleted from the persistent storage area.
Example
from ontology.interop.Ontology.Contract import Migrate
from ontology.interop.System.Contract import Destroy
from ontology.interop.System.Runtime import Notify
def Main(operation, args):
if operation == "destroy_contract":
return destroy_contract()
return False
def destroy_contract():
Destroy()
Notify(["The contract has been destoryed"])
return True
3. Migrate
The existing contract will be replaced by the newly migrated contract. The data saved by the old contract will also be migrated to the new contract. The old contract will be deleted after migration.
Migrate parameters
Param | Description |
---|---|
script | avm code |
need_storage | Need persistent storage or not |
name | Author name |
version | Contract version |
author | Contract author |
Developer email | |
description | Contract description |
Example
from ontology.interop.Ontology.Contract import Migrate
from ontology.interop.System.Contract import Destroy
from ontology.interop.System.Runtime import Notify
def Main(operation, args):
if operation == "migrate_contract":
if len(args) != 7:
return False
avm_code = args[0]
need_storage = args[1]
name = args[2]
version = args[3]
author = args[4]
email = args[5]
description = args[6]
return migrate_contract(avm_code)
return False
def migrate_contract(avm_code, need_storage, name, version, author, email, description):
res = Migrate(avm_code, need_storage, name, version, author, email, description)
if res:
Notify(["Migrate successfully"])
return True
else:
return False
Follow up question: How to improve this contract?
Answer: Add CheckWitness().
网友评论