Alex Wendland awendland

Logging setup for FastAPI

This logging setup configures Structlog to output pretty logs in development, and JSON log lines in production.

Then, you can use Structlog loggers or standard logging loggers, and they both will be processed by the Structlog pipeline (see the hello() endpoint for reference). That way any log generated by your dependencies will also be processed and enriched, even if they know nothing about Structlog!

Requests are assigned a correlation ID with the asgi-correlation-id middleware (either captured from incoming request or generated on the fly). All logs are linked to the correlation ID, and to the Datadog trace/span if instrumented. This data "global to the request" is stored in context vars, and automatically added to all logs produced during the request thanks to Structlog. You can add to these "global local variables" at any point in an endpoint with `structlog.contextvars.bind_contextvars(custom

Motivation

expression-oriented programming one of the great advances of FP
expressions plug together like legos, making more malleable programming experience in-the-small

Examples

Write in an expression-oriented style, scoping variables as locally as possible:

exFAT support on macOS seems to have some bugs because my external drives with exFAT formatting will randomly get corrupted.

Disk Utility is unable to repair this at first, but the fix is this:

Use diskutil list to find the right drive id.
You want the id under the IDENTIFIER column, it should look like disk1s1
Run sudo fsck_exfat -d <id from above>. eg sudo fsck_exfat -d disk1s3
-d is debug so you'll see all your files output as they're processed.
Answer YES if it gives you the prompt Main boot region needs to be updated. Yes/No?

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

	import * as React from 'react'

	type DragScrollProvisions = {
	onMouseDown: React.MouseEventHandler<HTMLElement>,
	ref: React.Ref<HTMLElement>,
	}

	export type Props = {
	children: (provisions: DragScrollProvisions) => React.ReactNode,
	}

	namespace TypeBranding {
	// This incurs no runtime cost. It is a purely compile-time construct.

	type Meters = number & { __metersBrand: any };
	type Miles = number & { __milesBrand: any };

	function Meters(i: number): Meters { return i as Meters; }
	function Miles(i: number): Miles { return i as Miles; }

	let a: Meters;

	# import config.
	# You can change the default config with `make cnf="config_special.env" build`
	cnf ?= config.env
	include $(cnf)
	export $(shell sed 's/=.*//' $(cnf))

	# import deploy config
	# You can change the default deploy config with `make cnf="deploy_special.env" release`
	dpl ?= deploy.env
	include $(dpl)

	///<reference path="iterator.ts"/>
	///<reference path="checks.ts"/>

	import AbstractIterator = Iterators.AbstractIterator;
	import Iterator = Iterators.Iterator;
	import checkNotNull = Preconditions.checkNotNull;

	abstract class Optional<T> {

	static absent<T>():Optional<T> {

	export default class WebStorage {
	constructor(key, storageArea = window.localStorage) {
	this.key = key;
	this.storageArea = storageArea;
	}

	load(defaultValue) {
	const serialized = this.storageArea.getItem(this.key);
	return serialized === null ? defaultValue : this.deserialize(serialized);
	}