Technical Perspectives | How much does the Python Smart Contract Execution API know?

01 lead

In the previous issue, we introduced the Ontology Smart Contract Storage API . I believe that many small partners understand how to call the relevant API for persistent storage when developing Python smart contracts on the ontology. In this issue we discuss how to use the Runtime API (Contract Execution API). The Runtime API has eight related APIs that provide a common interface for contract execution, helping developers get data, transform data, and validate data. A brief description of these 8 APIs is as follows:

Figure | Network

• Comparison of IPFS and EdgeFS for Secure Edge/IoT Computing Use Cases
• Five major problems read through the PoA consensus algorithm
• Analysis | Pre-selection and pre-submission mechanisms for Byzantine fault-tolerant consensus

 From ontology.interop.System.Runtime import GetTime, CheckWitness, Notify, Serialize, Deserialize from ontology.interop.Ontology.Runtime import Base58ToAddress, AddressToBase58, GetCurrentBlockHas 

  From ontology.interop.System.Runtime import Notify
 Def demo():
     Notify("hello world") 

  From ontology.interop.System.Runtime import GetTime
 Def demo():
     Time=GetTime()
     Return time # returns the timestamp in seconds 

  From ontology.interop.Ontology.Runtime import GetCurrentBlockHash
 Def demo():
     Block_hash = GetCurrentBlockHash()
     Return block_hash 

  From ontology.interop.System.Runtime import Notify, Serialize, Deserialize
 From ontology.interop.System.Storage import Put, Get, GetContext
 Def Main(operation, args):
     If operation == 'serialize_to_bytearray':
         Data = args[0]
         Return serialize_to_bytearray(data)
     If operation == 'deserialize_from_bytearray':
         Key = args[0]
         Return deserialize_from_bytearray(key)
     Return False
 Def serialize_to_bytearray(data):
     Sc = GetContext()
     Key = "1"
     Byte_data = Serialize(data) # Serialize the passed arguments Put(sc, key, byte_data) # Store the serialized data in the blockchain 

Def deserialize_from_bytearray(key): sc = GetContext() byte_data = Get(sc, key) # Extract data from the blockchain by key data = Deserialize(byte_data) # Deserialize the bytearray data into the original type data return data

  From ontology.interop.Ontology.Runtime import Base58ToAddress, AddressToBase58
 Def demo():
     Base58_addr="AV1GLfVzw28vtK3d1kVGxv5xuWU59P6Sgn"
     Addr=Base58ToAddress(base58_addr) # Convert base58 address to bytearray form address Notify(addr)
     Base58_addr=AddressToBase58(addr) #convert the bytearray address to base58 address Notify(base58_addr) 

https://github.com/ontio/ontology-python-compiler/blob/master/ontology/interop/System/ExecutionEngine.py

  From ontology.interop.System.Runtime import CheckWitness
 From ontology.interop.Ontology.Runtime import Base58ToAddress
 Def demo():
     Addr=Base58ToAddress("AW8hN1KhHE3fLDoPAwrhtjD1P7vfad3v8z")
     Res=CheckWitness(addr) # Verify that the caller address is AW8hN1KhHE3fLDoPAwrhtjD1P7vfad3v8z
     Return res 

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