From dc85fc60c2670e23b56f7b6e6f154560bf42a683 Mon Sep 17 00:00:00 2001 From: Brandon Liu Date: Tue, 19 Jul 2022 20:35:05 +0800 Subject: [PATCH] add initial implementation of cloudflare worker --- serverless/cloudflare/.gitignore | 1 + serverless/cloudflare/package-lock.json | 557 ++++++++++++++++++++++++ serverless/cloudflare/package.json | 10 + serverless/cloudflare/worker.ts | 119 +++++ 4 files changed, 687 insertions(+) create mode 100644 serverless/cloudflare/.gitignore create mode 100644 serverless/cloudflare/package-lock.json create mode 100644 serverless/cloudflare/package.json create mode 100644 serverless/cloudflare/worker.ts diff --git a/serverless/cloudflare/.gitignore b/serverless/cloudflare/.gitignore new file mode 100644 index 0000000..1521c8b --- /dev/null +++ b/serverless/cloudflare/.gitignore @@ -0,0 +1 @@ +dist diff --git a/serverless/cloudflare/package-lock.json b/serverless/cloudflare/package-lock.json new file mode 100644 index 0000000..46870a4 --- /dev/null +++ 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/dev/null +++ b/serverless/cloudflare/worker.ts @@ -0,0 +1,119 @@ +import { PMTiles, Source } from "../../js"; + +interface Env { + BUCKET: R2Bucket; + CACHE_TTL: string; +} + +interface CacheEntry { + lastUsed: number; + buffer: DataView; +} + +export class LRUCache { + entries: Map; + counter: number; + + constructor() { + this.entries = new Map(); + this.counter = 0; + } + + async get( + bucket: R2Bucket, + key: string, + offset: number, + length: number + ): Promise<[boolean, DataView]> { + let cacheKey = key + ":" + offset + "-" + length; + let val = this.entries.get(cacheKey); + if (val) { + val.lastUsed = this.counter++; + return [true, val.buffer]; + } + + let resp = await bucket.get(key, { + range: { offset: offset, length: length }, + }); + let a = await (resp as R2ObjectBody).arrayBuffer(); + let d = new DataView(a); + + this.entries.set(cacheKey, { + lastUsed: this.counter++, + buffer: d, + }); + if (this.entries.size > 128) { + let minUsed = Infinity; + let minKey = undefined; + this.entries.forEach((val, key) => { + if (val.lastUsed < minUsed) { + minUsed = val.lastUsed; + minKey = key; + } + }); + if (minKey) this.entries.delete(minKey); + } + + return [false, d]; + } +} + +let worker_cache = new LRUCache(); + +const TILE = new RegExp( + /^\/([0-9a-zA-Z\/!\-_\.\*\'\(\)]+)\/(\d+)\/(\d+)\/(\d+).pbf$/ +); + +export default { + async fetch( + request: Request, + env: Env, + context: ExecutionContext + ): Promise { + let url = new URL(request.url); + + let match = url.pathname.match(TILE); + + let subrequests = 1; + + if (match) { + class TempSource { + getKey() { + return ""; + } + + async getBytes(offset: number, length: number) { + let result = await worker_cache.get( + env.BUCKET, + match![1] + ".pmtiles", + offset, + length + ); + + if (!result[0]) subrequests++; + + return result[1]; + } + } + + let source = new TempSource(); + + let p = new PMTiles(source); + let entry = await p.getZxy(+match[2], +match[3], +match[4]); + if (entry) { + let tile = await env.BUCKET.get(match![1] + ".pmtiles", { + range: { offset: entry.offset, length: entry.length }, + }); + + let headers = new Headers(); + headers.set("Access-Control-Allow-Origin", "*"); + headers.set("Content-Type", "application/x-protobuf"); + headers.set("X-Pmap-Subrequests", subrequests.toString()); + return new Response((tile as R2ObjectBody).body, { + headers: headers, + }); + } + } + return new Response("Not Found"); + }, +};