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feat: ✨ implement larc caching (#148)
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import { chmod, copyFile, mkdir, rm } from "node:fs/promises"; | ||
import { dirname, join } from "node:path"; | ||
import { fileURLToPath } from "node:url"; | ||
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import { build } from "esbuild"; | ||
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const __dirname = dirname(fileURLToPath(import.meta.url)); | ||
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/** | ||
* @see https://github.com/evanw/esbuild/issues/1921#issuecomment-1623640043 | ||
*/ | ||
// language=JavaScript | ||
const js = ` | ||
import topLevelModule from "node:module"; | ||
import topLevelUrl from "node:url"; | ||
import topLevelPath from "node:path"; | ||
const require = topLevelModule.createRequire(import.meta.url); | ||
const __filename = topLevelUrl.fileURLToPath(import.meta.url); | ||
const __dirname = topLevelPath.dirname(__filename); | ||
`; | ||
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async function buildApp() { | ||
const options = { | ||
entryPoints: { index: "src/index.ts" }, | ||
outdir: "dist", | ||
outExtension: { ".js": ".mjs" }, | ||
bundle: true, | ||
minify: true, | ||
format: "esm", | ||
platform: "node", | ||
target: "node20", | ||
logLevel: "info", | ||
banner: { js }, | ||
plugins: [ | ||
{ | ||
name: "clean", | ||
setup(build) { | ||
build.onStart(async () => { | ||
await rm(join(__dirname, "dist/"), { recursive: true, force: true }); | ||
await mkdir(join(__dirname, "dist/")); | ||
}); | ||
}, | ||
}, | ||
{ | ||
name: "copy", | ||
setup(build) { | ||
build.onEnd(async () => { | ||
await copyFile( | ||
join( | ||
__dirname, | ||
"../../libs/db/node_modules/prisma/libquery_engine-linux-arm64-openssl-3.0.x.so.node", | ||
), | ||
join(__dirname, "dist/libquery_engine-linux-arm64-openssl-3.0.x.so.node"), | ||
); | ||
await copyFile( | ||
join(__dirname, "../../libs/db/prisma/schema.prisma"), | ||
join(__dirname, "dist/schema.prisma"), | ||
); | ||
await chmod( | ||
join(__dirname, "dist/libquery_engine-linux-arm64-openssl-3.0.x.so.node"), | ||
0o755, | ||
); | ||
}); | ||
}, | ||
}, | ||
], | ||
}; | ||
await build(options); | ||
} | ||
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buildApp().then(); |
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{ | ||
"name": "@services/larc-scraper", | ||
"version": "0.0.0", | ||
"private": true, | ||
"description": "Automated scraper for LARC sections", | ||
"license": "MIT", | ||
"type": "module", | ||
"main": "src/index.ts", | ||
"types": "src/index.ts", | ||
"scripts": { | ||
"build": "node build.mjs" | ||
}, | ||
"dependencies": { | ||
"@libs/db": "workspace:^", | ||
"@libs/uc-irvine-lib": "workspace:^", | ||
"@libs/utils": "workspace:^", | ||
"cheerio": "1.0.0-rc.12", | ||
"cross-fetch": "4.0.0" | ||
}, | ||
"devDependencies": { | ||
"@peterportal-api/types": "workspace:^", | ||
"esbuild": "0.20.1" | ||
} | ||
} |
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import { PrismaClient } from "@libs/db"; | ||
import { LarcResponse, Quarter } from "@peterportal-api/types"; | ||
import { load } from "cheerio"; | ||
import { fetch } from "cross-fetch"; | ||
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import { fmtBldg, fmtDays, fmtTime, quarterToLarcSuffix } from "./lib"; | ||
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const EARLIEST_YEAR = 2019; | ||
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const prisma = new PrismaClient(); | ||
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export const sleep = async (duration: number) => | ||
new Promise((resolve) => setTimeout(resolve, duration)); | ||
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export const handler = async () => { | ||
const data: Array<{ year: string; quarter: Quarter; courses: LarcResponse }> = []; | ||
const quarters = ["Fall", "Winter", "Spring", "Summer1", "Summer2"] as const; | ||
for (let year = EARLIEST_YEAR; year < new Date().getFullYear() + 2; ++year) { | ||
for (const quarter of quarters) { | ||
console.log(`Scraping ${year} ${quarter}`); | ||
const html = await fetch( | ||
`https://enroll.larc.uci.edu/${year}${quarterToLarcSuffix(quarter)}`, | ||
).then((response) => response.text()); | ||
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const $ = load(html); | ||
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const courses = $(".tutorial-group") | ||
.toArray() | ||
.map((card) => { | ||
const match = $(card) | ||
.find(".card-header") | ||
.text() | ||
.trim() | ||
.match( | ||
/(?<courseNumber>[^()]*)( \(same as (?<sameAs>.*)\))? - (.*) \((?<courseName>.*)\)/, | ||
); | ||
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const sections = $(card) | ||
.find(".list-group") | ||
.toArray() | ||
.map((group) => { | ||
const rows = $(group).find(".col-lg-4"); | ||
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const [days, time] = $(rows[0]) | ||
.find(".col") | ||
.map((_, col) => $(col).text().trim()); | ||
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const [instructor, building] = $(rows[1]) | ||
.find(".col") | ||
.map((_, col) => $(col).text().trim()); | ||
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return { | ||
days: fmtDays(days), | ||
time: fmtTime(time), | ||
instructor, | ||
bldg: fmtBldg(building), | ||
}; | ||
}); | ||
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return { courseInfo: { ...match?.groups }, sections }; | ||
}); | ||
data.push({ year: year.toString(), quarter, courses: (courses as LarcResponse) ?? [] }); | ||
await sleep(1000); | ||
} | ||
} | ||
await prisma.$transaction([prisma.larcTerm.deleteMany({}), prisma.larcTerm.createMany({ data })]); | ||
}; | ||
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handler().then(); |
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import { dirname, join } from "node:path"; | ||
import { fileURLToPath } from "node:url"; | ||
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import { Duration } from "aws-cdk-lib"; | ||
import { Rule, RuleTargetInput, Schedule } from "aws-cdk-lib/aws-events"; | ||
import { LambdaFunction } from "aws-cdk-lib/aws-events-targets"; | ||
import { Architecture, Code, Function, Runtime } from "aws-cdk-lib/aws-lambda"; | ||
import { Construct } from "constructs"; | ||
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export class LarcScraper extends Construct { | ||
constructor(scope: Construct, id: string) { | ||
super(scope, id); | ||
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const ruleName = `${id}-rule`; | ||
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const rule = new Rule(this, ruleName, { | ||
ruleName, | ||
schedule: Schedule.rate(Duration.days(1)), | ||
}); | ||
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const functionName = `${id}-function`; | ||
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rule.addTarget( | ||
new LambdaFunction( | ||
new Function(this, functionName, { | ||
architecture: Architecture.ARM_64, | ||
code: Code.fromAsset( | ||
join(dirname(fileURLToPath(import.meta.url)), "../../../../services/larc-scraper/dist"), | ||
), | ||
functionName, | ||
handler: "index.handler", | ||
timeout: Duration.seconds(15), | ||
runtime: Runtime.NODEJS_20_X, | ||
memorySize: 512, | ||
}), | ||
{ | ||
event: RuleTargetInput.fromObject({ body: "{}" }), | ||
}, | ||
), | ||
); | ||
} | ||
} |
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