This is a collection of the things I believe about software development. I have worked for years building backend and data processing systems, so read the below within that context.
Agree? Disagree? Feel free to let me know at @JanStette. See also my blog at www.janvsmachine.net.
Keep it simple, stupid. You ain't gonna need it.
| #!/usr/bin/env python | |
| """ | |
| Implements the Poseidon permutation: | |
| Starkad and Poseidon: New Hash Functions for Zero Knowledge Proof Systems | |
| - Lorenzo Grassi, Daniel Kales, Dmitry Khovratovich, Arnab Roy, Christian Rechberger, and Markus Schofnegger | |
| - https://eprint.iacr.org/2019/458.pdf | |
| Other implementations: |
| /* | |
| This function will help you to convert your object from struct to map[string]interface{} based on your JSON tag in your structs. | |
| Example how to use posted in sample_test.go file. | |
| */ | |
| func structToMap(item interface{}) map[string]interface{} { | |
| res := map[string]interface{}{} | |
| if item == nil { | |
| return res | |
| } |
| # LVDB - LLOOGG Memory DB | |
| # Copyriht (C) 2009 Salvatore Sanfilippo <antirez@gmail.com> | |
| # All Rights Reserved | |
| # TODO | |
| # - cron with cleanup of timedout clients, automatic dump | |
| # - the dump should use array startsearch to write it line by line | |
| # and may just use gets to read element by element and load the whole state. | |
| # - 'help','stopserver','saveandstopserver','save','load','reset','keys' commands. | |
| # - ttl with milliseconds resolution 'ttl a 1000'. Check ttl in dump! |
Having seen @pirapira's sketch of Bamboo ( https://github.com/pirapira/bamboo/ ), which proposed to add better control about the "smart contract program flow", even across calls, I thought that this should certainly be added to Solidity, and actually, it might even be possible now to a certain degree using inline assembly.
The problem is that with many functions in a contract, it is not always clear which can be called at which stage in the contract's lifetime. Certain smart contracts would be easier to understand if written as follows:
| import time | |
| import numpy as np | |
| import threading | |
| import tensorflow as tf | |
| from tensorflow.python.client import timeline | |
| def test_queue(): |
| # install build dependencies | |
| sudo yum install -y git-core zlib zlib-devel gcc-c++ patch readline readline-devel libyaml-devel libffi-devel openssl-devel make bzip2 autoconf automake libtool bison curl sqlite-devel | |
| # clone and install rbenv environment | |
| cd ~ | |
| git clone git://github.com/sstephenson/rbenv.git .rbenv | |
| git clone git://github.com/sstephenson/ruby-build.git ~/.rbenv/plugins/ruby-build | |
| echo 'export PATH="$HOME/.rbenv/bin:$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bash_profile | |
| echo 'eval "$(rbenv init -)"' >> ~/.bash_profile |
Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.
$ python -m SimpleHTTPServer 8000先前在《開源應用程式架構》 一書中，我介紹了 SocialCalc 這個在瀏覽器中運行的試算表編輯器，以取代伺服器為中心的 WikiCalc 架構。SocialCalc 在瀏覽器中執行所有的運算，只有在載入和儲存試算表時才會使用伺服器。
追求效能是 Socialtext 團隊在 2006 年時設計 SocialCalc 的主要目的。重點在於：在 JavaScript 環境下執行客戶端運算，儘管在當年的速度僅有伺服器端 Perl 運算的十分之一，但仍然勝過 AJAX 來回傳輸資料造成的網路延遲：
