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implement tile_path customization for cloudflare

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This commit is contained in:
Brandon Liu
2022-10-19 22:34:55 +08:00
parent da235cac22
commit 9346762aa5
2 changed files with 82 additions and 23 deletions
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63
serverless/cloudflare/src/index.ts
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@@ -15,6 +15,7 @@ import {
interface Env {
BUCKET: R2Bucket;
PMTILES_PATH?: string;
TILE_PATH?: string;
}
class KeyNotFoundError extends Error {
@@ -23,17 +24,46 @@ class KeyNotFoundError extends Error {
}
}
const TILE = new RegExp(
/^\/([0-9a-zA-Z\/!\-_\.\*\'\(\)]+)\/(\d+)\/(\d+)\/(\d+).([a-z]+)$/
);
export const pmtiles_path = (p: string | undefined, name: string): string => {
if (p) {
return p.replace("{name}", name);
export const pmtiles_path = (name: string, setting?: string): string => {
if (setting) {
return setting.replace("{name}", name);
}
return name + ".pmtiles";
};
const TILE =
/^\/(?<NAME>[0-9a-zA-Z\/!\-_\.\*\'\(\)]+)\/(?<Z>\d+)\/(?<X>\d+)\/(?<Y>\d+).(?<EXT>[a-z]+)$/;
export const tile_path = (
path: string,
setting?: string
): {
ok: boolean;
name: string;
tile: [number, number, number];
ext: string;
} => {
let pattern = TILE;
if (setting) {
// escape regex
setting = setting.replace(/[.*+?^$()|[\]\\]/g, "\\$&");
setting = setting.replace("{name}", "(?<NAME>[0-9a-zA-Z/!-_.*'()]+)");
setting = setting.replace("{z}", "(?<Z>\\d+)");
setting = setting.replace("{x}", "(?<X>\\d+)");
setting = setting.replace("{y}", "(?<Y>\\d+)");
setting = setting.replace("{ext}", "(?<EXT>[a-z]+)");
pattern = new RegExp(setting);
}
let match = path.match(pattern);
if (match) {
const g = match.groups!;
return { ok: true, name: g.NAME, tile: [+g.Z, +g.X, +g.Y], ext: g.EXT };
}
return { ok: false, name: "", tile: [0, 0, 0], ext: "" };
};
const CACHE = new ResolvedValueCache();
class R2Source implements Source {
@@ -51,7 +81,7 @@ class R2Source implements Source {
async getBytes(offset: number, length: number): Promise<RangeResponse> {
const resp = await this.env.BUCKET.get(
pmtiles_path(this.env.PMTILES_PATH, this.archive_name),
pmtiles_path(this.archive_name, this.env.PMTILES_PATH),
{
range: { offset: offset, length: length },
}
@@ -72,15 +102,10 @@ export default {
ctx: ExecutionContext
): Promise<Response> {
const url = new URL(request.url);
const match = url.pathname.match(TILE)!;
const {ok, name, tile, ext} = tile_path(url.pathname, env.TILE_PATH);
if (match) {
const archive_name = match[1];
const z = +match[2];
const x = +match[3];
const y = +match[4];
const ext = match[5];
const source = new R2Source(env, archive_name);
if (ok) {
const source = new R2Source(env, name);
const p = new PMTiles(source, CACHE);
let header = await p.getHeader();
@@ -100,7 +125,7 @@ export default {
// TODO: optimize by checking header min/maxzoom
try {
const tile = await p.getZxy(z, x, y);
const tiledata = await p.getZxy(tile[0], tile[1], tile[2]);
const headers = new Headers();
headers.set("Access-Control-Allow-Origin", "*"); // TODO: make configurable
@@ -120,8 +145,8 @@ export default {
}
// TODO: optimize by making decompression optional
if (tile) {
return new Response(tile.data, { headers: headers, status: 200 });
if (tiledata) {
return new Response(tiledata.data, { headers: headers, status: 200 });
} else {
return new Response(undefined, { headers: headers, status: 204 });
}