Aakarshit Uppal aksh1618

Rust Deep Dive - Pinning 📌

If a Pin drops in a room, and nobody around understands it, does it make an unsound?

Josh Triplett

Introduction

Pre-reqs

Auto traits: Traits that rust automatically implements for primitives and anything with all constituents (e.g. fields of a struct) implementing that trait.
Existence of std::mem::swap implies that ability to gain mutable ref means ability to move

Ctrl + Tab in Chromium Based Browsers

Install the CLUT: Cycle Last Used Tabs extension (e.g. from chrome web store)
Go to Manage Extensions page (chrome://extensions/shortcuts)
Open console (Right Click -> Inspect -> Tab named "Console")

Past this script, and press Enter:

// Find the id and command for the CLUT extension in this chromium based
// browser. It will run something like:
// chrome.developerPrivate.updateExtensionCommand({
//     extensionId: "cobieddmkhhnbeldhncnfcgcaccmehgn",

Rust Deep Dive - Error Handling 🐦‍🔥

Slide from a talk by Jane Losare-Lusby, who maintains the eyre crate

Reactive Streams Spec: The purpose of Reactive Streams is to provide a standard for asynchronous stream processing with non-blocking backpressure.
- Publisher:
```
void subscribe(Subscriber<? super T> s)
```
- Subscriber:
```
void onSubscribe(Subscription s);
void onNext(T t);
```

void onError(Throwable t);

Guide to "Reactive" for Spring MVC Developers (2018) by Rossen Stoyanchev (Pivotal): Great explanantion of moving from RestTemplate to WebClient while staying with WebMVC/Tomcat
Do’s and Don’ts: Avoiding First-Time Reactive Programmer Mines (2019) by Sergei Egorov (Pivotal):
- Need to subscribe and use the return value
- Do NOT use for CPU intensive tasks
- There is probably a better operator for what you are trying to do: https://projectreactor.io/docs/core/release/reference/#which-operator
- Migrate in steps, but block only once
- No ThreadLocals: Use deferWithContext or SchedulerHooks
- Resiliency: timeout, retry, default, error etc.
- Run blocking code on custom schedulers: publishOn & subscribeOn
Stack traces for Debugging: checkpoint, ReactorDebugAgent

aletheia (signature embedding tool)
- repo: https://github.com/danielquinn/aletheia
- scope: Currently in Python, needs to be ported to additional languages

Parsing & Conversion

Json to YAML: json2yaml.com
Json/POJO Format: json2pretty.com

Calculators & Evaluators

Regex Tool: regex101
Cron Tool: cron-expression-generator-quartz
JsonPath Evaluator: Jayway JsonPath Evaluator
Java SimpleDateFormat: Java SimpleDateFormat Tester

	[lints.clippy]
	#################################### Warns #####################################
	#--- suspicious, complexity, perf & style groups are warn-by-default
	#--- set entire pedantic group to warn (pedantic is intended for opt-outs)
	pedantic = { level = "warn", priority = -1 } # feel free to #[allow] specific lints in code
	nursery = { level = "warn", priority = -1 }
	#--- set selective lints from restriction group to warn (restriction is intended for opt-ins)
	# restriction = { level = "warn", priority = -1 }
	absolute_paths = "warn" # clippy.toml: `absolute-paths-max-segments = 2`
	allow_attributes = "warn"

	// Rust playground link: https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=7c51f91cfddb501bd24fdaa6d7238d80

	const PAGESIZE: u64 = 4096;
	const MIN_SIZE_KIB: u64 = 4;

	fn main() {
	println!("Enter BadRAM string. It must be a single line of comma separated");
	println!("values, with address and mask alternating. This is basically the");
	println!("badram output from memtest86+ et al with all values in a single");
	println!("line without the `badram=` prefix.");

	/*
	* Copyright 2021 the original author or authors.
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software