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Andrey Upadyshev oliora

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@oliora
oliora / udp-receiver.py
Last active August 3, 2023 10:42
Trivial UDP receiver in Python
# Run it like `python3 udp-receiver.py 0.0.0.0 <listening_port>`
import socket
import sys
with socket.socket(type=socket.SOCK_DGRAM) as s:
s.bind((sys.argv[1], int(sys.argv[2])))
while True:
(data, ancdata, msg_flags, address) = s.recvmsg(1024)
print(f'Received "{data.decode()}", ancdata="{ancdata}", sender={address}, flags={msg_flags}')
@oliora
oliora / udp-send.py
Last active August 11, 2023 13:21
Trivial UDP sender in Python
# Run it like `python3 udp-send.py <detination_addr> <destination_port> [<interface_to_bind>]`
import socket
import sys
with socket.socket(type=socket.SOCK_DGRAM) as s:
if len(sys.argv) >= 4:
s.bind((sys.argv[3], 0))
s.connect((sys.argv[1], int(sys.argv[2])))
s.send(b'Hello!')
@oliora
oliora / strlen.h
Last active August 3, 2023 10:43
Primitive AVX2 strlen implementation in C++
#pragma once
#include "common.h" // https://github.com/oliora/habr-switches-perf-test/blob/main/common.h
#include <cstdint>
#include <string_view>
#include <utility>
#include <immintrin.h>
template <size_t StepSize>
requires((StepSize <= PageSize)
@oliora
oliora / timestamp.sh
Created November 8, 2022 14:58
Shell timestamp conversion aliases
alias to-timesptamp-ms="python3 -c 'import datetime, sys; s = sys.argv[1]; s = s[:-1] if s[-1] == \"Z\" else s; print(round(datetime.datetime.fromisoformat(s).replace(tzinfo=datetime.timezone.utc).timestamp() * 1000))'"
alias from-timesptamp-ms="python3 -c 'import datetime, sys; t = int(sys.argv[1]); print(datetime.datetime.utcfromtimestamp(t/1000).strftime(\"%Y-%m-%dT%H:%M:%S.%f\")[:-3]+\"Z\")'"from-timesptamp-ms
@oliora
oliora / .shellrc
Last active May 5, 2022 18:21
tmux and ssh agent
# Add this to ~/.bashrc or ~/.zshrc or whatever shell you use
if [ -e $HOME/.ssh/ssh_auth_sock ]; then
export SSH_AUTH_SOCK=$HOME/.ssh/ssh_auth_sock
fi
@oliora
oliora / The white town 1 - townscaper
Last active October 29, 2021 19:31
KSSGuvxn6Pi6x2pu1m3yvrgnDvLeg8S5JwbnHRPr_w-uIeI9z6LN9loec9FRdP7x2ah7U3aw743WBXwhrdyDkrlzNZe78s6LBdt0_yR3E7LNdTrfM19RUnyunlG22C3put5tyvrgnDvLuGI3S5mMv4_ROTDtfE0Dsfks1Q6B1Nsub15O0JqbVHt261my2e2ht1C3pubeH-uCeO8u4BzLlrmMXbnHRvmeWd7rbodLufWnwPbHaDSbi6W1GtWrXny2e2G2SLcbq7m3yvrgnDvLeg8S5JwrpnVvvuh2t4_TEfbMHbWrOnfuDdQaLTbi6W1RrrXnyundYbtxdq7m3yvrgnDvLegcwq3X3Q7b57HtcjZt6cQ6z0moOad96M29sDbX4O1dw743VxNHeXcwq3X3Q7naZ1qwlpjWb9aNjdP7x2FuTd38WVjfrqWBXVVVwhbW9_6uFrfizWdOad96M29sDbX4O1Nq28GVN_tqCaFcVNref9i7q_ks3QzWduVd0661Zs7ZH2uxtqm6WVt5tqqa8bV1K4Z1DtvVtf_yWdORdr6o11rwY3wOstqW4WVN1tqqq28WVN_dW9_6Pl6u1b2YjNpBJtMtJqbVb0arXnyundY7C3puV1m3Z1Lur6pNuysa_5O0BpLTnouVd0661Zs7ZH2uxdq7a6h2P9waH6g0lpTU3qOad96M29s7rf2it6s5n7QbQ6z0JqVbVpGtStetaG7s6nJ4kxthjEHbu6c_Z7QHkuMtaia1W1qRrVrXX4O1dwbN_tWBXwhr103g36C6O79BAuEsJhtNsRi1GwymjWH2uxd87K4qR0fa3_cu1g3PAYtEcS42xRiNts2YWtndYbLc38O_NqVQtdeEdfQ3uBgtEcS42xRitogmWUrXbG7e2htLcn62m3qyPNZe7cjobNdwq7JA2SxmE22xGJWDJrFl10zRrrXny2e2ht1C3puLlnM325R0rpnV3tH8DAWDJXUOtcrajWXvOjdP7x2ahbNQepcTm3OPiu109MBHSuoc
@oliora
oliora / prompt.zsh
Created September 22, 2021 10:47
zsh prompt
ZSH_THEME_GIT_PROMPT_PREFIX="%{$fg[yellow]%}["
ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%} "
ZSH_THEME_GIT_PROMPT_DIRTY="]%{$fg[red]%}✗"
ZSH_THEME_GIT_PROMPT_CLEAN="]"
export PROMPT='%{$BG[237]%}%{$fg[white]%}💰 %3c%{$reset_color%} $(git_prompt_info)'
@oliora
oliora / groupby_to_dict.py
Created November 6, 2020 09:04
A Python one liner to group list of items into a dictionary of lists
# One-liner
# items = [(1, 'a'), (2, 'b'), (3, 'c'), (1, 'd'), (3, 'e'), (1, 'f')]
reduce(lambda d, item: d.setdefault(item[0], []).append(item) or d, items, {})
# >>> {1: [(1, 'a'), (1, 'd'), (1, 'f')], 2: [(2, 'b')], 3: [(3, 'c'), (3, 'e')]}
# Featured function
def groupby_to_dict(iterable, key=None, value=None):
@oliora
oliora / type_t.h
Created March 4, 2020 08:56
type_t implementation and example
template<class T, typename... Ts>
using type_t = T;
// Alternative implementation for compilers before
// [CWG 1558](http://open-std.org/JTC1/SC22/WG21/docs/cwg_defects.html#1558)
// template<class T, typename... Ts> struct type_t_impl { typedef T type;};
// template<class T, typename... Ts> using type_t = typename type_t_impl<T, Ts...>::type;
// Usage example:
@oliora
oliora / safe_advance.h
Last active September 26, 2019 02:38
Implementation of safe std::advance, std::next and std::prev similar to proposed N4317 paper "New Safer Functions to Advance Iterators"
// N4317 "New Safer Functions to Advance Iterators" paper can be found at
// http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2014/n4317.pdf
namespace detail {
template<class InputIter>
inline void do_advance(InputIter& it, InputIter end, typename std::iterator_traits<InputIter>::difference_type n, std::input_iterator_tag)
{
assert(n >= 0);
for (; (n > 0) && (it != end); --n)
++it;