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// Cloudflare Workers scheduled handler for cron jobs
import type { ScheduledController, ScheduledEvent } from '@cloudflare/workers-types';
interface Env {
BASE_URL: string;
AUTH_USER: string;
AUTH_PASS: string;
IMGS_BUCKET: R2Bucket;
}
interface ImageData {
[key: string]: string[];
}
class GeshemUpdate {
private bucket: R2Bucket;
private env: Env;
constructor(bucket: R2Bucket, env: Env) {
this.bucket = bucket;
this.env = env;
}
private async authenticate(request: Request): Promise<Request> {
const headers = new Headers(request.headers);
const credentials = btoa(`${this.env.AUTH_USER}:${this.env.AUTH_PASS}`);
headers.set('Authorization', `Basic ${credentials}`);
return new Request(request.url, {
method: request.method,
headers,
body: request.body
});
}
private async getLatestImages(): Promise<string[]> {
const authenticatedRequest = await this.authenticate(new Request(this.env.BASE_URL));
const response = await fetch(authenticatedRequest);
const html = await response.text();
const regex = /radar280comp_\d+\.png/g;
const matches = html.match(regex) || [];
const uniqueImages = [...new Set(matches)];
return uniqueImages.sort().slice(-10);
}
private async getLatestBucketKeys(): Promise<string[]> {
const yesterday = new Date();
yesterday.setDate(yesterday.getDate() - 1);
const yesterdayStr = yesterday.toISOString().slice(0, 10).replace(/-/g, '');
try {
const objects = await this.bucket.list({
prefix: 'imgs/',
startAfter: `imgs/${yesterdayStr}`
});
return objects.objects.map(obj => obj.key);
} catch (error) {
console.error('Error listing bucket objects:', error);
return [];
}
}
private async fetchMissingImages(): Promise<boolean> {
const images = await this.getLatestImages();
const s3Images = await this.getLatestBucketKeys();
let updated = false;
for (const img of images) {
const key = this.keyFromFilename(img);
if (!s3Images.includes(key)) {
await this.fetchImage(img, key);
updated = true;
}
}
return updated;
}
private async fetchImage(imgName: string, key: string): Promise<void> {
console.log(`Downloading ${imgName} from web server`);
const imageUrl = `${this.env.BASE_URL}/${imgName}`;
const authenticatedRequest = await this.authenticate(new Request(imageUrl));
const response = await fetch(authenticatedRequest);
if (!response.ok) {
throw new Error(`Failed to fetch image: ${response.statusText}`);
}
const imageData = await response.arrayBuffer();
console.log(`Uploading to ${key}`);
await this.bucket.put(key, imageData, {
httpMetadata: {
contentType: 'image/png',
cacheControl: 'public, max-age=31536000'
}
});
}
private keyFromFilename(filename: string): string {
const [name, dateStr] = filename.split('.')[0].split('_');
const res = 280;
// Parse date: YYYYMMDDHHMM
const year = dateStr.slice(0, 4);
const month = dateStr.slice(4, 6);
const day = dateStr.slice(6, 8);
const hour = dateStr.slice(8, 10);
const minute = dateStr.slice(10, 12);
const d = `${year}${month}${day}`;
const t = `${hour}${minute}`;
return `imgs/${d}/${t}/${res}.png`;
}
private async generateJson(): Promise<void> {
const latestKeys = await this.getLatestBucketKeys();
const keys = latestKeys
.filter(key => key.endsWith('280.png'))
.sort()
.slice(-10);
const index: ImageData = { '280': keys };
await this.bucket.put('imgs.json', JSON.stringify(index), {
httpMetadata: {
contentType: 'application/json',
cacheControl: 'public, max-age=60'
}
});
}
async run(): Promise<string> {
try {
const updated = await this.fetchMissingImages();
if (updated) {
await this.generateJson();
}
return `Updated: ${updated}`;
} catch (error) {
console.error('Error in GeshemUpdate.run():', error);
throw error;
}
}
}
export default {
async scheduled(
controller: ScheduledController,
env: Env,
ctx: ExecutionContext
): Promise<void> {
console.log('Cron job triggered at', new Date().toISOString());
try {
if (!env?.BASE_URL || !env?.AUTH_USER || !env?.AUTH_PASS) {
throw new Error('Missing environment variables');
}
if (!env.IMGS_BUCKET) {
throw new Error('R2 bucket not configured');
}
const updater = new GeshemUpdate(env.IMGS_BUCKET, env);
const result = await updater.run();
console.log(`Cron job completed: ${result}`);
} catch (error) {
console.error('Error in scheduled function:', error);
throw error;
}
}
};
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