spalladino

Falsehoods that Ethereum programmers believe

I recently stumbled upon Falsehoods programmers believe about time zones, which got a good laugh out of me. It reminded me of other great lists of falsehoods, such as about names or time, and made me look for an equivalent for Ethereum. Having found none, here is my humble contribution to this set.

About Gas

Calling estimateGas will return the gas required by my transaction

Calling estimateGas will return the gas that your transaction would require if it were mined now. The current state of the chain may be very different to the state in which your tx will get mined. So when your tx i

graninas

At the beginning of 2030, I found this essay in my archives. From what I know today, I think it was very insightful at the moment of writing. And I feel it should be published because it can teach us, Rust developers, how to prevent that sad story from happening again.

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What killed Haskell, could kill Rust, too

What killed Haskell, could kill Rust, too. Why would I even mention Haskell in this context? Well, Haskell and Rust are deeply related. Not because Rust is Haskell without HKTs. (Some of you know what that means, and the rest of you will wonder for a very long time). Much of the style of Rust is similar in many ways to the style of Haskell. In some sense Rust is a reincarnation of Haskell, with a little bit of C-ish like syntax, a very small amount.

Is Haskell dead?

Rich-Harris

I've been deceiving you all. I had you believe that Svelte was a UI framework — unlike React and Vue etc, because it shifts work out of the client and into the compiler, but a framework nonetheless.

But that's not exactly accurate. In my defense, I didn't realise it myself until very recently. But with Svelte 3 around the corner, it's time to come clean about what Svelte really is.

Svelte is a language.

Specifically, Svelte is an attempt to answer a question that many people have asked, and a few have answered: what would it look like if we had a language for describing reactive user interfaces?

A few projects that have answered this question:

shareefhiasat

#!/usr/bin/env sh
#i tried it and working like charm just have to note make the file .sh chmod +x and you may need sudo to run with permission but be carefull with sudo
#be sure the $JAVA_HOME is configure correctly or make it static as commentedline 7 below
OLDDIR="$PWD"

if [ -z "$CACERTS_FILE" ]; then
# you should have java home configure to point for example /usr/lib/jvm/default-java/jre/lib/security/cacerts
    CACERTS_FILE=$JAVA_HOME/jre/lib/security/cacerts
fi

briansmith

https://bitcointalk.org/index.php?topic=289795.msg3183975#msg3183975
https://bitcointalk.org/index.php?topic=289795.msg3191346#msg3191346
https://bitcointalk.org/index.php?topic=289795.msg3200275#msg3200275
SECG 1.0: http://www.secg.org/SEC2-Ver-1.0.pdf

                                    ASCII "MinghuaQu"
1. secp112r1             00F50B028E|4D696E676875615175|290472783FB1
2. secp112r2             002757A111|4D696E676875615175|5316C05E0BD4
                               ----|                  |
3. secp128r1                 000E0D|4D696E676875615175|0CC03A4473D03679

dbathgate

import java.io.IOException;

import org.apache.commons.io.IOUtils;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.LocatedFileStatus;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.RemoteIterator;
import org.apache.hadoop.hdfs.DistributedFileSystem;
import org.apache.hadoop.security.UserGroupInformation;

fntlnz

Create Root CA (Done once)

Create Root Key

Attention: this is the key used to sign the certificate requests, anyone holding this can sign certificates on your behalf. So keep it in a safe place!

openssl genrsa -des3 -out rootCA.key 4096

davidejones

#!/bin/bash

instance_profile=`curl http://169.254.169.254/latest/meta-data/iam/security-credentials/`
aws_access_key_id=`curl http://169.254.169.254/latest/meta-data/iam/security-credentials/${instance_profile} | grep AccessKeyId | cut -d':' -f2 | sed 's/[^0-9A-Z]*//g'`
aws_secret_access_key=`curl http://169.254.169.254/latest/meta-data/iam/security-credentials/${instance_profile} | grep SecretAccessKey | cut -d':' -f2 | sed 's/[^0-9A-Za-z/+=]*//g'`
token=`curl -s http://169.254.169.254/latest/meta-data/iam/security-credentials/${instance_profile} | sed -n '/Token/{p;}' | cut -f4 -d'"'`

file="somefile.deb"
bucket="some-bucket-of-mine"
date="`date +'%a, %d %b %Y %H:%M:%S %z'`"