escherize

Toucan2 Hooks: How They Work and Why They're Powerful

The Hook System

Toucan2 uses a derive-based hook system rather than explicit method implementations. You declare behavior by deriving your model from special hook keywords.

Common Hook Patterns in Metabase

1. Timestamps - Automatic created_at/updated_at

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Problem Statement

Investigated suspected memory leak in metabase.util.malli.registry/cache atom. Initial reports suggested unbounded memory growth during test runs.

Root Cause Analysis

The real issue wasn't a memory leak, but fundamentally broken caching for function schemas. With the original schema-cache-key implementation, schemas containing function objects generated unstable cache keys because:

(fn [x] ...) creates new function objects each time Function objects have different identity even with identical code This caused cache misses for functionally identical schemas

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(ns mage.escherize.analyze-cache-misses
  (:require
   [clojure.edn :as edn]
   [clojure.java.io :as io]
   [clojure.string :as str]
   [mage.util :as util]))

(defn read-log [log-file]
  (map second (edn/read-string (str "[" (slurp log-file) "]"))))

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https://gist.github.com/escherize/24e99c1ad6bd6bab2971d520093c2470

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(ns src.dev.nocommit.malli-match
  (:require
   [malli.core :as mc]
   [clojure.set :as set]
   [clojure.string :as str]
   [clojure.walk :as walk]))

(defn underive-children [tag]
  "Remove all children of the given tag."
  (let [children (descendants tag)]

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brew install --cask google-chrome zoom spotify vlc libreoffice iterm2 visual-studio-code && \
brew install git curl htop zsh-autosuggestions neofetch && \
RUNZSH=no KEEP_ZSHRC=yes sh -c "$(curl -fsSL https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh)"

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env MB_FUZZ=1 yarn test-unit frontend/src/metabase/querying/expressions/fuzz.compiler.unit.spec.ts
yarn run v1.22.22
warning ../package.json: No license field
$ yarn build:cljs && jest --maxWorkers=4 frontend/src/metabase/querying/expressions/fuzz.compiler.unit.spec.ts
warning ../package.json: No license field
$ yarn && yarn build-pure:cljs
warning ../package.json: No license field
$ echo $npm_execpath | grep -q yarn || echo '\033[0;33mSorry, npm is not supported. Please use Yarn (https://yarnpkg.com/).\033[0m'
[1/5] 🔍  Validating package.json...
[2/5] 🔍  Resolving packages...

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(ns mage.color
  (:require
   [clojure.string :as str]
   [clojure.walk :as w]))

(def ^:dynamic *disable-colors*
  "If set to true, all color functions will return the input string as is."
  false)

(def ^:private reset

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// ==UserScript==
// @name         GitHub Rerun Failed Jobs (Manual Trigger + Watcher) @escherize
// @namespace    http://tampermonkey.net/
// @version      0.7
// @description  Manually trigger a watcher to auto re-run failed GitHub Actions jobs
// @match        https://github.com/*/*/actions/runs/**
// @grant        none
// ==/UserScript==

(function () {

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