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2018 - How the Rubyist use Blockchain
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蒼時弦や
May 07, 2018
Technology
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130
2018 - How the Rubyist use Blockchain
The talks about ruby and blockchain in rubyelixirconftw.
蒼時弦や
May 07, 2018
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Transcript
How the Rubyist use Blockchain
WEB DEVELOPER GAME DEVELOPER 襟 儘 䓛⛳ @elct9620
None
I will talk about What is the Blockchain The examples
use Ruby and Ethereum
What is the Blockchain
Linked List Cryptography Key-Value Data Store Distributed System
There is nothing new for us
None
Cryptocurrency
None
So, how the Blockchain works?
Chain =~ Linked List
The Chain Block #1 Block #2 Block #3 Pointer Pointer
Ok, I think you already learned it!
But, we have to limit anyone to write it!!!
1. Proof of Work
1. Prevent mass request from somebody 2. Other people can
verify in short time Cryptography
Use cryptography to resolve question!
Cryptography Network Hash start with “000” Workers Define a Question
Broadcast
Cryptography Workers 000abcdefaaabc… Network Try hash block Submit
Cryptography Network 000abcdefaaabc Block Created Verify result Accept
Wait! The same content will get the same hash result!
None
We add a random “Proof” string with block data
So, the worker should spend the time
And others can check it in short time
If we receive many correct answers…
Which one should accept?
2. Byzantine Generals Problem
Distributed 1. Longest is right 2. 51% node think it
is right
But, we didn’t discuss the algorithm in this talk
And last
How the Blockchain save data?
Merkle Tree
None
Very useful to update and verify data
But read will spend more time
Should I use pure ruby gem to operate blockchain?
It is hard to implement the same API in pure
Ruby
Use the existed API to operate Blockchain.
But, you can implement blockchain in Ruby
Example Ethereum’s IPC Use Ruby to operate Ethereum
IPC =~ UnixSocket
None
How to get IPC and comminuted with it?
IPC 1. Ethereum Wallet 2. brew install geth 3. Compile
from source code
“geth —light —testnet”
But I suggest using Ethereum Wallet
Because you can find IPC file very easy
But how to use UnixSocket to operate Ethereum?
JSON-RPC 2.0
None
None
And it always ends with a linefeed (\n)
None
None
Now, we can interact with Ethereum in Ruby
But the result has many hash value
What are the meaning and real data?
Ethereum Data 1. Call another API to get transaction value
2. Read from “data” depend on ABI
If we just want to know transaction value
It always contains in API response
So, we talk about smart contract event
None
But we got the data in hex
None
It always returns the 32byte hex string for us
So, we need ABI to help us know the data
type
None
Demo - Subscribe event and get data
Now, we know what can we do on the Ethereum
And last, is there has any useful resource?
Ruby Reference 1. digest-sha3 2. rlp 3. ruby-ethereum 4. Naivechain.rb
Conclusion
Build a blockchain in Ruby can help us learn it
And didn’t try to write a client in pure ruby
THANKS