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index.js
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index.js
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'use strict'
const fs = require('fs').promises
const {Octokit} = require('@octokit/rest')
const {
GET_ISSUES_QUERY
, HIDE_COMMENTS_QUERY
} = require('./lib/queries.js')
const parseCoverage = require('./lib/parse-coverage.js')
const COMMENT_HEADER = '<!-- COMPARE_COV_TO_MAIN COMMENT HEADER -->'
module.exports = class Comparer {
constructor({
coverage_filepath
, dry_run
, owner
, pr_id
, repo
, token
}) {
this.coverage_filepath = coverage_filepath
this.dry_run = dry_run === true
this.owner = owner
this.pr_id = pr_id
this.repo = repo
this.token = token
if (!this.token) {
const err = new Error('Missing github token. Set GITHUB_TOKEN env var.')
err.code = 'EMISSINGTOKEN'
throw err
}
if (!this.dry_run) {
if (!this.pr_id) {
const err = new Error('Missing pr_id. Please specify the PR ID')
err.code = 'EMISSINGPRID'
throw err
}
}
this.client = new Octokit({
auth: token
})
this.old_pct = 0
this.new_pct = 0
this.changes = new Map()
}
async run() {
console.log('running...')
await this.compare()
console.log('done', {
'old': this.old_pct
, 'new': this.new_pct
})
if (!this.dry_run) {
await this.hideOldComments()
await this.createPRComment()
}
// Reset
const changes = this.changes
const old_pct = this.old_pct
const new_pct = this.new_pct
this.changes = new Map()
this.old_pct = 0
this.new_pct = 0
return {
old_pct
, new_pct
, changes
}
}
async hideOldComments() {
const comments_list = await this.client.graphql(GET_ISSUES_QUERY, {
owner: this.owner
, repo: this.repo
, issue_id: this.pr_id
})
const comments = comments_list.repository.pullRequest.comments.nodes
for (const issue of comments) {
if (issue.isMinimized || !issue.body.includes(COMMENT_HEADER)) continue
console.log('minimize issue %s', issue.id)
await this.client.graphql(HIDE_COMMENTS_QUERY, {
owner: this.owner
, repo: this.repo
, id: issue.id
, classifier: 'OUTDATED'
})
}
}
async createPRComment() {
const body = `${COMMENT_HEADER}\n\n${this.buildIssueContent()}`
await this.client.issues.createComment({
owner: this.owner
, repo: this.repo
, issue_number: this.pr_id
, body
})
}
async getLatestCoverage() {
// Fetch the latest release from GitHub.
// If the release has a coverage.json file.
const release = await this.client.repos.getLatestRelease({
owner: this.owner
, repo: this.repo
})
let asset_id
for (const asset of release.data.assets) {
if (asset.name === 'coverage-summary.json') {
asset_id = asset.id
break
}
}
if (!asset_id) {
const err = new Error('Unable to find previous coverage file')
err.code = 'ENOPREVCOVERAGE'
throw err
}
const asset = await this.client.repos.getReleaseAsset({
owner: this.owner
, repo: this.repo
, asset_id
, request: {
headers: {
accept: 'application/octet-stream'
, authorization: `token ${this.token}`
}
}
})
const latest = JSON.parse(Buffer.from(asset.data))
return parseCoverage(latest)
}
async getCurrentCoverage() {
const contents = await fs.readFile(this.coverage_filepath, 'utf8')
return parseCoverage(JSON.parse(contents))
}
async compare() {
const [main, current] = await Promise.all([
this.getLatestCoverage()
, this.getCurrentCoverage()
])
this.old_pct = main.total
this.new_pct = current.total
const checked = new Set()
for (const [filename, pct] of main.files) {
checked.add(filename)
if (!current.files.has(filename)) {
// File was (re)moved
continue
}
const new_pct = current.files.get(filename)
if (new_pct !== pct) {
this.changes.set(filename, {
'old': pct
, 'new': new_pct
})
}
}
for (const [filename, pct] of current.files) {
if (checked.has(filename)) continue
checked.add(filename)
if (pct !== 100) {
this.changes.set(filename, {
'old': null
, 'new': pct
})
}
}
}
buildIssueContent() {
if (!this.changes.size) {
return 'Coverage remained the same'
}
const buf = []
const title = this.getTotalChangeMessage()
buf.push(COMMENT_HEADER, '', title, '')
buf.push('| Change | File | Coverage |')
buf.push('| ------ | ---- | -------- |')
for (const [filename, result] of this.changes) {
const row = []
let change
if (result.new && result.old === null) {
// new file without 100% coverage
row.push(':warning:')
change = `new file (${result.new.toFixed(2)}%)`
} else if (result.new < result.old) {
row.push(':warning:')
change = `-${(result.old - result.new).toFixed(2)}%`
} else {
row.push(':white_check_mark:')
change = `${(result.new - result.old).toFixed(2)}%`
}
row.push(`\`${filename}\``)
row.push(change)
buf.push(`| ${row.join(' | ')} |`)
}
buf.push('')
return buf.join('\n')
}
getTotalChangeMessage() {
if (this.old_pct < this.new_pct) {
const diff = (this.new_pct - this.old_pct).toFixed(2)
return `:tada: Total coverage went up by ${diff}%`
}
const diff = (this.old_pct - this.new_pct).toFixed(2)
return `:warning: Total coverage went down by ${diff}%`
}
}