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// Copyright Epic Games, Inc. All Rights Reserved.
"use strict";
import { Cache } from "./cache.js"
import { Message } from "./worker.js"
import { Fetcher } from "../util/fetcher.js"
////////////////////////////////////////////////////////////////////////////////
class Indexer
{
constructor(pages)
{
this._pages = pages;
}
lookup_id(entry_id)
{
const bin_search = function(page) {
var l = 0;
var r = page.length;
while (l < r)
{
const mid = l + ((r - l) >> 1);
const d = entry_id - page[mid][0];
if (d < 0n) r = mid;
else if (d > 0n) l = mid + 1;
else return mid;
}
return -1;
};
for (const page of this._pages)
{
const index = bin_search(page);
if (index >= 0)
return page[index][1];
}
return "";
}
*search(needle)
{
var needleLwr = needle.toLowerCase();
for (const page of this._pages)
for (const [_, name] of page)
if (name.toLowerCase().indexOf(needleLwr) >= 0)
yield name;
}
*enum_names()
{
for (const page of this._pages)
for (const [_, name] of page)
yield name;
}
*enum_all()
{
for (const page of this._pages)
for (const [_, name, size, raw_size] of page)
yield [name, size|0n, raw_size|0n];
}
}
////////////////////////////////////////////////////////////////////////////////
async function save(progress_cb, oplog_info, pages)
{
const project_id = oplog_info["project"];
const cache = new Cache(project_id, "pages");
const page_count = pages.length;
const puts = new Array(page_count);
for (var i = 0; i < page_count; ++i)
puts[i] = cache.put("pages", i, pages[i]);
var okay = true
for (var i = 0; i < page_count; ++i)
{
okay &= await puts[i];
progress_cb("saving", i + 1, page_count);
}
if (!okay)
return false;
cache.put("pages", "$", {
"page_count" : pages.length,
"total_size" : oplog_info["totalsize"],
"op_count" : oplog_info["opcount"],
"timestamp" : (Date.now() / 1000) | 0,
});
return true
}
////////////////////////////////////////////////////////////////////////////////
async function build(progress_cb, oplog_info, max_workers=6, page_size=48 << 10)
{
const project_id = oplog_info["project"];
const oplog = oplog_info["id"];
const init_msg = Message.create(Message.Init, project_id, oplog);
const worker_n = Math.min(navigator.hardwareConcurrency / 2, max_workers);
const stride = page_size * worker_n;
const end = oplog_info["opcount"];
var entry_count = 0;
const pages = new Array();
const executor = function(index, resolve, reject) {
const worker = new Worker("indexer/worker.js", { type: "module" });
worker.onerror = (evt) => reject(Error("Worker error"));
worker.onmessage = (evt) => {
const [msg_id, ...params] = evt.data;
switch (msg_id)
{
case Message.MapDone:
resolve();
worker.terminate();
break;
case Message.MapPage:
const [page] = params;
pages.push(page);
entry_count += page.length;
progress_cb("parsing", entry_count, end);
break;
}
}
worker.postMessage(init_msg);
const start = page_size * index;
const map_msg = Message.create(Message.Map, start, end, page_size, stride);
worker.postMessage(map_msg);
};
const workers = []
for (var i = 0; i < worker_n; ++i)
{
const worker = new Promise((...args) => executor(i, ...args));
workers.push(worker);
}
for (const worker of workers)
await worker;
return pages;
}
////////////////////////////////////////////////////////////////////////////////
async function load(progress_cb, oplog_info)
{
const project_id = oplog_info["project"];
const cache = new Cache(project_id, "pages");
const meta = await cache.get("pages", "$");
var hit = false;
if (meta)
{
const yesterday = (Date.now() / 1000) - (24 * 60 * 60);
hit = true;
hit &= (meta["total_size"] == oplog_info["totalsize"]);
hit &= (meta["op_count"] == oplog_info["opcount"]);
hit &= (meta["timestamp"] >= yesterday);
}
if (!hit)
return null;
const page_count = meta["page_count"];
const gets = new Array(page_count);
const pages = new Array(page_count);
for (var i = 0; i < page_count; ++i)
gets[i] = cache.get("pages", i);
progress_cb("loading", 0, page_count);
for (var i = 0; i < page_count; ++i)
{
pages[i] = await gets[i];
progress_cb("loading", i + 1, page_count);
}
return pages;
}
////////////////////////////////////////////////////////////////////////////////
export async function create_indexer(project_id, oplog, progress_cb)
{
if (!window.Worker)
throw Error("browser does not support web workers");
const oplog_info = await new Fetcher()
.resource("prj", project_id, "oplog", oplog)
.json();
var pages = await load(progress_cb, oplog_info);
if (!pages)
{
pages = await build(progress_cb, oplog_info);
await save(progress_cb, oplog_info, pages);
}
return new Indexer(pages);
}
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