192 lines
5.7 KiB
Markdown
192 lines
5.7 KiB
Markdown
# Node Tools >> Providence Analytics >> Overview ||10
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```js script
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import { html } from '@mdjs/mdjs-preview';
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import { providenceFlowSvg, providenceInternalFlowSvg } from './assets/_mermaid.svg.js';
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```
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Providence is the 'All Seeing Eye' that generates usage statistics by analyzing code.
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It measures the effectivity and popularity of your software.
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With just a few commands you can measure the impact for (breaking) changes, making
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your release process more stable and predictable.
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Providence can be used as a dev dependency in a project for which metrics
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can be generated via analyzers (see below).
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For instance for a repo "lion-based-ui" that extends @lion/\* we can answer questions like:
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- **Which subsets of my product are popular?**
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Which exports of reference project @lion/form-core are consumed by target project "lion-based-ui"?
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- **How do sub classers consume/override my product?**
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Which classes / webcomponents inside target project "lion-based-ui" extend from reference project `@lion/\*`?
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Which of the methods within those classes are overridden?
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- etc...
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All the above results can be shown in a dashboard (see below), which allows to sort exports from reference project (@lion) based on popularity, category, consumer etc.
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The dashboard allows to aggregate data from many target projects as well and will show you on a detailed (file) level how those components are being consumed by which projects.
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## Setup
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### Install providence
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```bash
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npm i --save-dev providence-analytics
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```
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### Add a providence script to package.json
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```json
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"scripts": {
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"providence:match-imports": "providence analyze match-imports -r 'node_modules/@lion/ui/*.js'",
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}
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```
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> The example above illustrates how to run the "match-imports" analyzer for reference project 'lion-based-ui'. Note that it is possible to run other analyzers and configurations supported by providence as well. For a full overview of cli options, run `npx providence --help`. All supported analyzers will be viewed when running `npx providence analyze`
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You are now ready to use providence in your project. All
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data will be stored in json files in the folder `./providence-output`
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## Setup: Dashboard
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### Add "providence:dashboard" script to package.json
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```js
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...
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"scripts": {
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...
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"providence:dashboard": "providence dashboard"
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}
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```
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### Add providence.conf.js
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```js
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export default {
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referenceCollections: {
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'lion-based-ui-collection': [
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'./node_modules/lion-based-ui/packages/x',
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'./node_modules/lion-based-ui/packages/y',
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],
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},
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};
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```
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Run `npm run providence:dashboard`
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## Setup: about result output
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All output files will be stored in `./providence-output`.
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This means they will be committed to git, so your colleagues don't have to
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rerun the analysis (for large projects with many dependencies this can be time consuming)
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and can directly start the dashboard usage metrics.
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Also, note that the files serve as cache (they are stored with hashes based on project version and analyzer configuration). This means that an interrupted analysis can be
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resumed later on.
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## Conceptual overview
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Providence performs queries on one or more search targets.
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These search targets consist of one or more software projects (javascript/html repositories)
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The diagram below shows how `providenceMain` function can be used from an external context.
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```js story
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export const providenceFlow = () => providenceFlowSvg;
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```
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## Flow inside providence
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The diagram below depicts the flow inside the `providenceMain` function.
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It uses:
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- InputDataService
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Used to create a data structure based on a folder (for instance the search target or
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the references root). The structure creates entries for every file, which get enriched with code,
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ast results, query results etc. Returns `InputData` object.
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- QueryService
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Requires a `queryConfig` and `InputData` object. It will perform a query (grep search or ast analysis)
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and returns a `QueryResult`.
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It also contains helpers for the creation of a `queryConfig`
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- ReportService
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The result gets outputted to the user. Currently, a log to the console and/or a dump to a json file
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are available as output formats.
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```js story
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export const providenceInternalFlow = () => providenceInternalFlowSvg;
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```
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## Queries
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Providence requires a queries as input.
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Queries are defined as objects and can be of two types:
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- feature-query
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- ast-analyzer
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A `QueryConfig` is required as input to run the `providenceMain` function.
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This object specifies the type of query and contains the relevant meta
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information that will later be outputted in the `QueryResult` (the JSON object that
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the `providenceMain` function returns.)
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## Analyzer Query
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Analyzer queries are also created via `QueryConfig`s.
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Analyzers can be described as predefined queries that use AST traversal.
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Run:
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```bash
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providence analyze
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```
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Now you will get a list of all predefined analyzers:
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- find-imports
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- find-exports
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- find-classes
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- match-imports
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- match-subclasses
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- etc...
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<!--
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## Running providence from its own repo
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### How to add a new search target project
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```bash
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git submodule add <git-url> ./providence-input-data/search-targets/<project-name>
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```
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### How to add a reference project
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By adding a reference project, you can automatically see how code in your reference project is
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used across the search target projects.
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Under the hood, this automatically creates a set of queries for you.
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```bash
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git submodule add <git-url> ./providence-input-data/references/<project-name>
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```
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### Updating submodules
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Please run:
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```bash
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git submodule update --init --recursive
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```
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### Removing submodules
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Please run:
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```bash
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sh ./rm-submodule.sh <path/to/submodule>
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```
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-->
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