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deno_core (#1827)
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A new low-level crate with focus on speed. 
This doesn't yet hook into the existing code base.
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ry authored Feb 26, 2019
1 parent 5dfbbbb commit b8a537d
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Showing 26 changed files with 1,478 additions and 120 deletions.
2 changes: 2 additions & 0 deletions BUILD.gn
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Expand Up @@ -13,6 +13,8 @@ group("default") {
":deno",
":hyper_hello",
":test_rs",
"core:deno_core_http_bench",
"core:deno_core_test",
"libdeno:test_cc",
]
}
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37 changes: 37 additions & 0 deletions core/BUILD.gn
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import("//build_extra/rust/rust.gni")

# deno_core does not depend on flatbuffers nor tokio.
main_extern = [
"$rust_build:futures",
"$rust_build:libc",
"$rust_build:serde_json",
"$rust_build:log",
]

rust_crate("deno_core") {
source_root = "lib.rs"
extern = main_extern
deps = [
"../libdeno:libdeno_static_lib",
]
}

rust_test("deno_core_test") {
source_root = "lib.rs"
extern = main_extern
deps = [
"../libdeno:libdeno_static_lib",
]
}

rust_executable("deno_core_http_bench") {
source_root = "http_bench.rs"
extern = [
"$rust_build:futures",
"$rust_build:lazy_static",
"$rust_build:libc",
"$rust_build:log",
"$rust_build:tokio",
":deno_core"
]
}
150 changes: 150 additions & 0 deletions core/http_bench.js
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// This is not a real HTTP server. We read blindly one time into 'requestBuf',
// then write this fixed 'responseBuf'. The point of this benchmark is to
// exercise the event loop in a simple yet semi-realistic way.
const shared32 = new Int32Array(libdeno.shared);

const INDEX_NUM_RECORDS = 0;
const INDEX_RECORDS = 1;
const RECORD_OFFSET_PROMISE_ID = 0;
const RECORD_OFFSET_OP = 1;
const RECORD_OFFSET_ARG = 2;
const RECORD_OFFSET_RESULT = 3;
const RECORD_SIZE = 4;
const OP_LISTEN = 1;
const OP_ACCEPT = 2;
const OP_READ = 3;
const OP_WRITE = 4;
const OP_CLOSE = 5;

const NUM_RECORDS = (shared32.length - INDEX_RECORDS) / RECORD_SIZE;
if (NUM_RECORDS != 100) {
throw Error("expected 100 entries");
}

const requestBuf = new Uint8Array(64 * 1024);
const responseBuf = new Uint8Array(
"HTTP/1.1 200 OK\r\nContent-Length: 12\r\n\r\nHello World\n"
.split("")
.map(c => c.charCodeAt(0))
);

const promiseMap = new Map();
let nextPromiseId = 1;

function createResolvable() {
let methods;
const promise = new Promise((resolve, reject) => {
methods = { resolve, reject };
});
return Object.assign(promise, methods);
}

/** Returns Promise<number> */
function sendAsync(op, arg, zeroCopyData) {
const id = nextPromiseId++;
const p = createResolvable();
shared32[INDEX_NUM_RECORDS] = 1;
setRecord(0, RECORD_OFFSET_PROMISE_ID, id);
setRecord(0, RECORD_OFFSET_OP, op);
setRecord(0, RECORD_OFFSET_ARG, arg);
setRecord(0, RECORD_OFFSET_RESULT, -1);
promiseMap.set(id, p);
libdeno.send(null, zeroCopyData);
return p;
}

/** Returns u32 number */
function sendSync(op, arg) {
shared32[INDEX_NUM_RECORDS] = 1;
setRecord(0, RECORD_OFFSET_PROMISE_ID, 0);
setRecord(0, RECORD_OFFSET_OP, op);
setRecord(0, RECORD_OFFSET_ARG, arg);
setRecord(0, RECORD_OFFSET_RESULT, -1);
libdeno.send();
return getRecord(0, RECORD_OFFSET_RESULT);
}

function setRecord(i, off, value) {
if (i >= NUM_RECORDS) {
throw Error("out of range");
}
shared32[INDEX_RECORDS + RECORD_SIZE * i + off] = value;
}

function getRecord(i, off) {
if (i >= NUM_RECORDS) {
throw Error("out of range");
}
return shared32[INDEX_RECORDS + RECORD_SIZE * i + off];
}

function handleAsyncMsgFromRust() {
for (let i = 0; i < shared32[INDEX_NUM_RECORDS]; i++) {
let id = getRecord(i, RECORD_OFFSET_PROMISE_ID);
const p = promiseMap.get(id);
promiseMap.delete(id);
p.resolve(getRecord(i, RECORD_OFFSET_RESULT));
}
}

/** Listens on 0.0.0.0:4500, returns rid. */
function listen() {
return sendSync(OP_LISTEN, -1);
}

/** Accepts a connection, returns rid. */
async function accept(rid) {
return await sendAsync(OP_ACCEPT, rid);
}

/**
* Reads a packet from the rid, presumably an http request. data is ignored.
* Returns bytes read.
*/
async function read(rid, data) {
return await sendAsync(OP_READ, rid, data);
}

/** Writes a fixed HTTP response to the socket rid. Returns bytes written. */
async function write(rid, data) {
return await sendAsync(OP_WRITE, rid, data);
}

function close(rid) {
return sendSync(OP_CLOSE, rid);
}

async function serve(rid) {
while (true) {
const nread = await read(rid, requestBuf);
if (nread <= 0) {
break;
}

const nwritten = await write(rid, responseBuf);
if (nwritten < 0) {
break;
}
}
close(rid);
}

async function main() {
libdeno.recv(handleAsyncMsgFromRust);

libdeno.print("http_bench.js start");

const listener_rid = listen();
libdeno.print(`listening http://127.0.0.1:4544/ rid = ${listener_rid}`);
while (true) {
const rid = await accept(listener_rid);
// libdeno.print(`accepted ${rid}`);
if (rid < 0) {
libdeno.print(`accept error ${rid}`);
return;
}
serve(rid);
}
}

main();
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