esemeniuc

Subscribe to any acount changes to Pyth SOL/USDC account (H6AR...QJEG):

This requires websocat - `brew install websocat`
```bash
echo '{"id":1,"jsonrpc":"2.0","method":"accountSubscribe","params":["H6ARHf6YXhGYeQfUzQNGk6rDNnLBQKrenN712K4AQJEG",{"encoding": "jsonParsed"}]}' | websocat --no-close "wss://internal.ny.mainnet.rpc.jito.wtf/?access-token=XYZ"
```

Output
```
{"jsonrpc":"2.0","method":"accountNotification","params":{"result":{"context":{"slot":240142003},"value":{"lamports":23942400,"data":["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

esemeniuc

local keys = redis.call('KEYS', ARGV[1]);
if next(keys) == nil then return keys end;
local chunk_size = 4096; -- must be under 8k, see https://github.com/nhibernate/NHibernate-Caches/issues/62
local n = #keys;
local out = {};

for i=1,n,chunk_size do
    local unpack_start = i;
    local unpack_end = math.min(n, i + chunk_size - 1);
    local vals = redis.call('MGET', unpack(keys, unpack_start, unpack_end));

esemeniuc

import React, {ErrorInfo} from 'react';

export default class ErrorBoundary extends React.Component<{}, { hasError: boolean }> {
    constructor(props: {}) {
        super(props);
        this.state = {hasError: false};
    }

    static getDerivedStateFromError(error: Error) {    // Update state so the next render will show the fallback UI.
        return {hasError: true};

esemeniuc

Generate expiring certs

#!/bin/bash

# Generate some test certificates which are used by the regression test suite:
#
#   tests/tls/ca.{crt,key}          Self signed CA certificate.
#   tests/tls/redis.{crt,key}       A certificate with no key usage/policy restrictions.
#   tests/tls/client.{crt,key}      A certificate restricted for SSL client usage.
#   tests/tls/server.{crt,key}      A certificate restricted for SSL server usage.

esemeniuc

use std::thread::sleep;
use std::time::{Duration, Instant};
use redis::{AsyncCommands, ConnectionLike, RedisResult};

use tokio::time::timeout;

use futures::StreamExt;
use futures_util::Stream;

/* Cargo.toml

esemeniuc

cat file.csv | sqlite3 demo.db ".import --csv '|cat -' mytable"; sqlite3 demo.db

esemeniuc

/* results on 24 threads, Linux, Ryzen 5900X, 64GB RAM, rust 1.66 release mode
mutex st: 3.504602ms
mutex mt 24 threads: 966.566131ms
rwlock st: 4.115984ms
rwlock mt 24 threads: 1.639819526s
parking_lot st: 4.255349ms
parking_lot mt 24 threads: 1.336455132s
try channel st: 18.446771ms
try channel mt 24 threads: 3.152402156s
new channel st: 45.410769ms

esemeniuc

import "array"
 
array.from(rows: [
  {_time: 2021-01-01T00:00:00Z, _value: "foo"},
  {_time: 2020-01-02T00:00:00Z, _value: "bar"}
])

esemeniuc

        use rustls;

        let roots = rustls::RootCertStore::empty();
        let mut tls = rustls::ClientConfig::builder()
            .with_safe_defaults()
            .with_root_certificates(roots)
            .with_no_client_auth();
        tls.key_log = Arc::new(rustls::KeyLogFile::new());

        let client = Arc::new(

esemeniuc

#!/usr/sbin/nft -f

# see https://unix.stackexchange.com/questions/740061/how-do-you-duplicate-all-udp-traffic-on-a-port-range-using-nftables/

# sends all duplicated packets to 10.0.0.1
# run this before applying this file
# sudo ip addr add 10.0.0.1/24 dev lo

# clean up with
# sudo ip addr delete 10.0.0.1/24 dev lo