1 files changed, 145 insertions, 0 deletions
diff --git a/core/examples/http_bench_bin_ops.js b/core/examples/http_bench_bin_ops.js
new file mode 100644
index 000000000..b4d7add22
--- /dev/null
+++ b/core/examples/http_bench_bin_ops.js
@@ -0,0 +1,145 @@
+// 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 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 assert(cond) {
+  if (!cond) {
+    throw Error("assert");
+  }
+}
+
+function createResolvable() {
+  let resolve;
+  let reject;
+  const promise = new Promise((res, rej) => {
+    resolve = res;
+    reject = rej;
+  });
+  promise.resolve = resolve;
+  promise.reject = reject;
+  return promise;
+}
+
+const scratch32 = new Int32Array(3);
+const scratchBytes = new Uint8Array(
+  scratch32.buffer,
+  scratch32.byteOffset,
+  scratch32.byteLength,
+);
+assert(scratchBytes.byteLength === 3 * 4);
+
+function send(promiseId, opId, rid, ...zeroCopy) {
+  scratch32[0] = promiseId;
+  scratch32[1] = rid;
+  scratch32[2] = -1;
+  return Deno.core.dispatch(opId, scratchBytes, ...zeroCopy);
+}
+
+/** Returns Promise<number> */
+function sendAsync(opId, rid, ...zeroCopy) {
+  const promiseId = nextPromiseId++;
+  const p = createResolvable();
+  const buf = send(promiseId, opId, rid, ...zeroCopy);
+  if (buf) {
+    const record = recordFromBuf(buf);
+    // Sync result.
+    p.resolve(record.result);
+  } else {
+    // Async result.
+    promiseMap.set(promiseId, p);
+  }
+  return p;
+}
+
+/** Returns i32 number */
+function sendSync(opId, rid) {
+  const buf = send(0, opId, rid);
+  const record = recordFromBuf(buf);
+  return record[2];
+}
+
+function recordFromBuf(buf) {
+  assert(buf.byteLength === 3 * 4);
+  return new Int32Array(buf.buffer, buf.byteOffset, buf.byteLength / 4);
+}
+
+function handleAsyncMsgFromRust(buf) {
+  const record = recordFromBuf(buf);
+  const p = promiseMap.get(record[0]);
+  promiseMap.delete(record[0]);
+  p.resolve(record[2]);
+}
+
+/** Listens on 0.0.0.0:4500, returns rid. */
+function listen() {
+  return sendSync(ops["listen"], -1);
+}
+
+/** Accepts a connection, returns rid. */
+function accept(rid) {
+  return sendAsync(ops["accept"], rid);
+}
+
+/**
+ * Reads a packet from the rid, presumably an http request. data is ignored.
+ * Returns bytes read.
+ */
+function read(rid, data) {
+  return sendAsync(ops["read"], rid, data);
+}
+
+/** Writes a fixed HTTP response to the socket rid. Returns bytes written. */
+function write(rid, data) {
+  return sendAsync(ops["write"], rid, data);
+}
+
+function close(rid) {
+  return sendSync(ops["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);
+}
+
+let ops;
+
+async function main() {
+  ops = Deno.core.ops();
+  for (const opName in ops) {
+    Deno.core.setAsyncHandler(ops[opName], handleAsyncMsgFromRust);
+  }
+
+  const listenerRid = listen();
+  Deno.core.print(`http_bench_bin_ops listening on http://127.0.0.1:4544/\n`);
+
+  for (;;) {
+    const rid = await accept(listenerRid);
+    // Deno.core.print(`accepted ${rid}`);
+    if (rid < 0) {
+      Deno.core.print(`accept error ${rid}`);
+      return;
+    }
+    serve(rid);
+  }
+}
+
+main();