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lambda: native decompression, 256MB LRU cache

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This commit is contained in:
Brandon Liu
2022-11-18 13:26:42 +08:00
parent 91ddf2e913
commit 4f0292ff91
1 changed files with 20 additions and 5 deletions
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25
serverless/aws/src/index.ts
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@@ -13,21 +13,36 @@ import {
TileType,
} from "../../../js";
// @ts-ignore
import https from "https";
import zlib from "zlib";
// @ts-ignore
import s3client from "/var/runtime/node_modules/aws-sdk/clients/s3.js";
const keepAliveAgent = new https.Agent({ keepAlive: true });
const keepAliveAgent = new https.Agent({ keepAlive: true, maxSockets: 1 });
var start;
// the region should default to the same one as the function
const s3 = new s3client({
httpOptions: { agent: keepAliveAgent },
});
// TODO: figure out how much memory to allocate
const CACHE = new ResolvedValueCache();
async function nativeDecompress(
buf: ArrayBuffer,
compression: Compression
): Promise<ArrayBuffer> {
if (compression === Compression.None || compression === Compression.Unknown) {
return buf;
} else if (compression === Compression.Gzip) {
return zlib.gunzipSync(buf);
} else {
throw Error("Compression method not supported");
}
}
// Lambda needs to run with 512MB, empty function takes about 70
const CACHE = new ResolvedValueCache(256000000, undefined, nativeDecompress);
// duplicated code below
export const pmtiles_path = (name: string, setting?: string): string => {
@@ -146,7 +161,7 @@ export const handler = async (
// TODO: metadata and TileJSON
const source = new S3Source(name);
const p = new PMTiles(source, CACHE);
const p = new PMTiles(source, CACHE, nativeDecompress);
try {
const header = await p.getHeader();
if (tile[0] < header.minZoom || tile[0] > header.maxZoom) {