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A living programming environment for blockchain

Pharo
Pharo

Talk from Pharodays 2017. Video: https://youtu.be/xzMz58gYPcE

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A living programming environment for a
living blockchain
by Santiago Bragagnolo - PharoDays - 2017
santiago.bragagnolo@gmail.com
santiago.bragagnolo@inria.fr
skype:santiago.bragagnolo
@sbragagnolo
Disclaimer!
This is not a blockchain mechanisms talk!
( Sorry disappoint you :) )
General technology
explanation
Starting by the fruit:
Smart contracts
• Digital reification of contracts
• Emulate the logic of contractual clauses
• Self-executing
• Self-enforcing
• Reduce transactional costs
• Minimise exceptions
Following by the branch:
Ethereum
• Blockchain based technology
• Open source & public network
• Smart contracts
• State stored in a blockchain
• Byte-code executed in the turing complete EVM
• Many development languages (solidity, serpent, etc)
Arriving to the trunk:
Blockchain
• Open and distributed ledger
• Records a constantly-growing list of transactions in between
two parties. (blocks)
• Resistant to modification by design
• Cryptocurrency: Paying to reinforce the social engagement
with the security
Ad

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A living programming environment for blockchain

  • 1. A living programming environment for a living blockchain by Santiago Bragagnolo - PharoDays - 2017 santiago.bragagnolo@gmail.com santiago.bragagnolo@inria.fr skype:santiago.bragagnolo @sbragagnolo
  • 2. Disclaimer! This is not a blockchain mechanisms talk! ( Sorry disappoint you :) )
  • 4. Starting by the fruit: Smart contracts • Digital reification of contracts • Emulate the logic of contractual clauses • Self-executing • Self-enforcing • Reduce transactional costs • Minimise exceptions
  • 5. Following by the branch: Ethereum • Blockchain based technology • Open source & public network • Smart contracts • State stored in a blockchain • Byte-code executed in the turing complete EVM • Many development languages (solidity, serpent, etc)
  • 6. Arriving to the trunk: Blockchain • Open and distributed ledger • Records a constantly-growing list of transactions in between two parties. (blocks) • Resistant to modification by design • Cryptocurrency: Paying to reinforce the social engagement with the security
  • 7. First-citizens in Blockchain • Block: stamped batch of transactions • Transaction: Representation of mutations of state • Movements of money • Method activation • Account: Source and target of transactions (account in the accountancy meaning) • Contracts (Specific in ethereum)
  • 8. So what? Architecture of a proposed application
  • 10. Pharo: Why? • Blockchain is a multiple actors always growing environment. • Blockchain is a living environment • Transactions move money (ether - bitcoin) from one place to other • Transactions execute smart contracts • Ethereum is a distributed runtime. Nothing better than a live environment for a living distributed runtime. • A lot of code analysis and inspection state-of-the-art tools
  • 11. Fog • Pharo client for the Ethereum client (GEth) • github.com/sbragagnolo/Fog
  • 12. Fog - features • Connection, communication, marshalling, etc. • Block fetching • Query and create transactions • Query and create contracts • Remote method invocation
  • 13. Fog - features • Development support • First-class citizen navigation (GT-Tools) • Accounts • Blocks • Transactions • Contracts • Automatic contract mirror generation • Automatic contract proxy building
  • 14. Fog - features • Cache • General • Connection • Session
  • 16. Block inspection • Navigating blocks • Inspecting blocks individually • Overview of a collection of blocks through statistics • Overview of the transactions of a collection of blocks
  • 20. pragma solidity ^0.4.2; contract StructTestContract { enum myenum { A, B, C } struct mystruct { bool boolean; myenum uservalue; uint32 commonvalue; } address _owner; bool bool1; int16 midint; mystruct simpleExample; bool bool2; mystruct[] arrayExample; function StructTestContract (){ _owner = msg.sender; bool1 = true; bool2 = true; midint = 32; simpleExample.boolean = true; simpleExample.uservalue = myenum.B; simpleExample.commonvalue = 6355432; arrayExample.push(mystruct(true, myenum.A, 134)); arrayExample.push(mystruct(false, myenum.B, 235)); arrayExample.push(mystruct(true, myenum.C, 34)); } function kill() { suicide(_owner); } Contract source code
  • 25. Fog - future • Finishing session management • Events support • Transactional message send recognition • New AST Definition (Henrique Rocha)
  • 26. THANKS :)! by Santiago Bragagnolo - PharoDays - 2017 santiago.bragagnolo@gmail.com santiago.bragagnolo@inria.fr skype:santiago.bragagnolo @sbragagnolo