From 68bbebd42cf6fb915c7bc3ec95179081cb6f67c5 Mon Sep 17 00:00:00 2001
From: Andrey Pechkurov <apechkurov@gmail.com>
Date: Thu, 22 Oct 2020 12:04:35 +0300
Subject: [PATCH] tls: allow reading data into a static buffer

Refs: #25436

PR-URL: https://github.com/nodejs/node/pull/35753
Refs: https://github.com/nodejs/node/pull/25436
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Minwoo Jung <nodecorelab@gmail.com>
---
 .../tls/{throughput.js => throughput-c2s.js}  |   0
 benchmark/tls/throughput-s2c.js               | 104 +++++++++
 doc/api/tls.md                                |   7 +
 lib/_tls_wrap.js                              |   2 +
 lib/net.js                                    |  87 ++++----
 .../parallel/test-tls-onread-static-buffer.js | 206 ++++++++++++++++++
 6 files changed, 362 insertions(+), 44 deletions(-)
 rename benchmark/tls/{throughput.js => throughput-c2s.js} (100%)
 create mode 100644 benchmark/tls/throughput-s2c.js
 create mode 100644 test/parallel/test-tls-onread-static-buffer.js

diff --git a/benchmark/tls/throughput.js b/benchmark/tls/throughput-c2s.js
similarity index 100%
rename from benchmark/tls/throughput.js
rename to benchmark/tls/throughput-c2s.js
diff --git a/benchmark/tls/throughput-s2c.js b/benchmark/tls/throughput-s2c.js
new file mode 100644
index 00000000000000..a505a719d30884
--- /dev/null
+++ b/benchmark/tls/throughput-s2c.js
@@ -0,0 +1,104 @@
+'use strict';
+const common = require('../common.js');
+const bench = common.createBenchmark(main, {
+  dur: [5],
+  type: ['buf', 'asc', 'utf'],
+  sendchunklen: [256, 32 * 1024, 128 * 1024, 16 * 1024 * 1024],
+  recvbuflen: [0, 64 * 1024, 1024 * 1024],
+  recvbufgenfn: ['true', 'false']
+});
+
+const fixtures = require('../../test/common/fixtures');
+let options;
+let recvbuf;
+let received = 0;
+const tls = require('tls');
+
+function main({ dur, type, sendchunklen, recvbuflen, recvbufgenfn }) {
+  if (isFinite(recvbuflen) && recvbuflen > 0)
+    recvbuf = Buffer.alloc(recvbuflen);
+
+  let encoding;
+  let chunk;
+  switch (type) {
+    case 'buf':
+      chunk = Buffer.alloc(sendchunklen, 'b');
+      break;
+    case 'asc':
+      chunk = 'a'.repeat(sendchunklen);
+      encoding = 'ascii';
+      break;
+    case 'utf':
+      chunk = 'ü'.repeat(sendchunklen / 2);
+      encoding = 'utf8';
+      break;
+    default:
+      throw new Error('invalid type');
+  }
+
+  options = {
+    key: fixtures.readKey('rsa_private.pem'),
+    cert: fixtures.readKey('rsa_cert.crt'),
+    ca: fixtures.readKey('rsa_ca.crt'),
+    ciphers: 'AES256-GCM-SHA384'
+  };
+
+  let socketOpts;
+  if (recvbuf === undefined) {
+    socketOpts = { port: common.PORT, rejectUnauthorized: false };
+  } else {
+    let buffer = recvbuf;
+    if (recvbufgenfn === 'true') {
+      let bufidx = -1;
+      const bufpool = [
+        recvbuf,
+        Buffer.from(recvbuf),
+        Buffer.from(recvbuf),
+      ];
+      buffer = () => {
+        bufidx = (bufidx + 1) % bufpool.length;
+        return bufpool[bufidx];
+      };
+    }
+    socketOpts = {
+      port: common.PORT,
+      rejectUnauthorized: false,
+      onread: {
+        buffer,
+        callback: function(nread, buf) {
+          received += nread;
+        }
+      }
+    };
+  }
+
+  const server = tls.createServer(options, (socket) => {
+    socket.on('data', (buf) => {
+      socket.on('drain', write);
+      write();
+    });
+
+    function write() {
+      while (false !== socket.write(chunk, encoding));
+    }
+  });
+
+  let conn;
+  server.listen(common.PORT, () => {
+    conn = tls.connect(socketOpts, () => {
+      setTimeout(done, dur * 1000);
+      bench.start();
+      conn.write('hello');
+    });
+
+    conn.on('data', (chunk) => {
+      received += chunk.length;
+    });
+  });
+
+  function done() {
+    const mbits = (received * 8) / (1024 * 1024);
+    bench.end(mbits);
+    process.exit(0);
+  }
+}
diff --git a/doc/api/tls.md b/doc/api/tls.md
index 055ba472b5c666..74288e7bb3d2ed 100644
--- a/doc/api/tls.md
+++ b/doc/api/tls.md
@@ -1357,6 +1357,9 @@ being issued by trusted CA (`options.ca`).
 <!-- YAML
 added: v0.11.3
 changes:
+  - version: REPLACEME
+    pr-url: https://github.com/nodejs/node/pull/35753
+    description: Added `onread` option.
   - version: v14.1.0
     pr-url: https://github.com/nodejs/node/pull/32786
     description: The `highWaterMark` option is accepted now.
@@ -1468,6 +1471,10 @@ changes:
     [`tls.createSecureContext()`][]. If a `secureContext` is _not_ provided, one
     will be created by passing the entire `options` object to
     `tls.createSecureContext()`.
+  * `onread` {Object} If the `socket` option is missing, incoming data is
+    stored in a single `buffer` and passed to the supplied `callback` when
+    data arrives on the socket, otherwise the option is ignored. See the
+    `onread` option of [`net.Socket`][] for details.
   * ...: [`tls.createSecureContext()`][] options that are used if the
     `secureContext` option is missing, otherwise they are ignored.
   * ...: Any [`socket.connect()`][] option not already listed.
diff --git a/lib/_tls_wrap.js b/lib/_tls_wrap.js
index f3307c21e219e4..fe281d0c5d9dff 100644
--- a/lib/_tls_wrap.js
+++ b/lib/_tls_wrap.js
@@ -502,6 +502,7 @@ function TLSSocket(socket, opts) {
     pauseOnCreate: tlsOptions.pauseOnConnect,
     manualStart: true,
     highWaterMark: tlsOptions.highWaterMark,
+    onread: !socket ? tlsOptions.onread : null,
   });
 
   // Proxy for API compatibility
@@ -1617,6 +1618,7 @@ exports.connect = function connect(...args) {
     enableTrace: options.enableTrace,
     pskCallback: options.pskCallback,
     highWaterMark: options.highWaterMark,
+    onread: options.onread,
   });
 
   // rejectUnauthorized property can be explicitly defined as `undefined`
diff --git a/lib/net.js b/lib/net.js
index 3e7dfe44e1632b..d8d2779c075cd1 100644
--- a/lib/net.js
+++ b/lib/net.js
@@ -307,55 +307,54 @@ function Socket(options) {
   if (options.handle) {
     this._handle = options.handle; // private
     this[async_id_symbol] = getNewAsyncId(this._handle);
-  } else {
-    const onread = options.onread;
-    if (onread !== null && typeof onread === 'object' &&
-        (isUint8Array(onread.buffer) || typeof onread.buffer === 'function') &&
-        typeof onread.callback === 'function') {
-      if (typeof onread.buffer === 'function') {
-        this[kBuffer] = true;
-        this[kBufferGen] = onread.buffer;
-      } else {
-        this[kBuffer] = onread.buffer;
-      }
-      this[kBufferCb] = onread.callback;
-    }
-    if (options.fd !== undefined) {
-      const { fd } = options;
-      let err;
+  } else if (options.fd !== undefined) {
+    const { fd } = options;
+    let err;
 
-      // createHandle will throw ERR_INVALID_FD_TYPE if `fd` is not
-      // a valid `PIPE` or `TCP` descriptor
-      this._handle = createHandle(fd, false);
+    // createHandle will throw ERR_INVALID_FD_TYPE if `fd` is not
+    // a valid `PIPE` or `TCP` descriptor
+    this._handle = createHandle(fd, false);
+
+    err = this._handle.open(fd);
+
+    // While difficult to fabricate, in some architectures
+    // `open` may return an error code for valid file descriptors
+    // which cannot be opened. This is difficult to test as most
+    // un-openable fds will throw on `createHandle`
+    if (err)
+      throw errnoException(err, 'open');
 
-      err = this._handle.open(fd);
+    this[async_id_symbol] = this._handle.getAsyncId();
 
-      // While difficult to fabricate, in some architectures
-      // `open` may return an error code for valid file descriptors
-      // which cannot be opened. This is difficult to test as most
-      // un-openable fds will throw on `createHandle`
+    if ((fd === 1 || fd === 2) &&
+        (this._handle instanceof Pipe) && isWindows) {
+      // Make stdout and stderr blocking on Windows
+      err = this._handle.setBlocking(true);
       if (err)
-        throw errnoException(err, 'open');
-
-      this[async_id_symbol] = this._handle.getAsyncId();
-
-      if ((fd === 1 || fd === 2) &&
-          (this._handle instanceof Pipe) && isWindows) {
-        // Make stdout and stderr blocking on Windows
-        err = this._handle.setBlocking(true);
-        if (err)
-          throw errnoException(err, 'setBlocking');
-
-        this._writev = null;
-        this._write = makeSyncWrite(fd);
-        // makeSyncWrite adjusts this value like the original handle would, so
-        // we need to let it do that by turning it into a writable, own
-        // property.
-        ObjectDefineProperty(this._handle, 'bytesWritten', {
-          value: 0, writable: true
-        });
-      }
+        throw errnoException(err, 'setBlocking');
+
+      this._writev = null;
+      this._write = makeSyncWrite(fd);
+      // makeSyncWrite adjusts this value like the original handle would, so
+      // we need to let it do that by turning it into a writable, own
+      // property.
+      ObjectDefineProperty(this._handle, 'bytesWritten', {
+        value: 0, writable: true
+      });
+    }
+  }
+
+  const onread = options.onread;
+  if (onread !== null && typeof onread === 'object' &&
+      (isUint8Array(onread.buffer) || typeof onread.buffer === 'function') &&
+      typeof onread.callback === 'function') {
+    if (typeof onread.buffer === 'function') {
+      this[kBuffer] = true;
+      this[kBufferGen] = onread.buffer;
+    } else {
+      this[kBuffer] = onread.buffer;
     }
+    this[kBufferCb] = onread.callback;
   }
 
   // Shut down the socket when we're finished with it.
diff --git a/test/parallel/test-tls-onread-static-buffer.js b/test/parallel/test-tls-onread-static-buffer.js
new file mode 100644
index 00000000000000..6e19184e887d2a
--- /dev/null
+++ b/test/parallel/test-tls-onread-static-buffer.js
@@ -0,0 +1,206 @@
+'use strict';
+const common = require('../common');
+if (!common.hasCrypto)
+  common.skip('missing crypto');
+
+const assert = require('assert');
+const tls = require('tls');
+const fixtures = require('../common/fixtures');
+
+const options = {
+  key: fixtures.readKey('agent2-key.pem'),
+  cert: fixtures.readKey('agent2-cert.pem')
+};
+
+const smallMessage = Buffer.from('hello world');
+// Used to test .pause(), so needs to be larger than the internal buffer
+const largeMessage = Buffer.alloc(64 * 1024).fill('hello world');
+
+// Test typical usage
+tls.createServer(options, common.mustCall(function(socket) {
+  this.close();
+  socket.end(smallMessage);
+})).listen(0, function() {
+  let received = 0;
+  const buffers = [];
+  const sockBuf = Buffer.alloc(8);
+  tls.connect({
+    port: this.address().port,
+    rejectUnauthorized: false,
+    onread: {
+      buffer: sockBuf,
+      callback: function(nread, buf) {
+        assert.strictEqual(buf, sockBuf);
+        received += nread;
+        buffers.push(Buffer.from(buf.slice(0, nread)));
+      }
+    }
+  }).on('data', common.mustNotCall()).on('end', common.mustCall(() => {
+    assert.strictEqual(received, smallMessage.length);
+    assert.deepStrictEqual(Buffer.concat(buffers), smallMessage);
+  }));
+});
+
+// Test Uint8Array support
+tls.createServer(options, common.mustCall(function(socket) {
+  this.close();
+  socket.end(smallMessage);
+})).listen(0, function() {
+  let received = 0;
+  let incoming = new Uint8Array(0);
+  const sockBuf = new Uint8Array(8);
+  tls.connect({
+    port: this.address().port,
+    rejectUnauthorized: false,
+    onread: {
+      buffer: sockBuf,
+      callback: function(nread, buf) {
+        assert.strictEqual(buf, sockBuf);
+        received += nread;
+        const newIncoming = new Uint8Array(incoming.length + nread);
+        newIncoming.set(incoming);
+        newIncoming.set(buf.slice(0, nread), incoming.length);
+        incoming = newIncoming;
+      }
+    }
+  }).on('data', common.mustNotCall()).on('end', common.mustCall(() => {
+    assert.strictEqual(received, smallMessage.length);
+    assert.deepStrictEqual(incoming, new Uint8Array(smallMessage));
+  }));
+});
+
+// Test Buffer callback usage
+tls.createServer(options, common.mustCall(function(socket) {
+  this.close();
+  socket.end(smallMessage);
+})).listen(0, function() {
+  let received = 0;
+  const incoming = [];
+  const bufPool = [ Buffer.alloc(2), Buffer.alloc(2), Buffer.alloc(2) ];
+  let bufPoolIdx = -1;
+  let bufPoolUsage = 0;
+  tls.connect({
+    port: this.address().port,
+    rejectUnauthorized: false,
+    onread: {
+      buffer: () => {
+        ++bufPoolUsage;
+        bufPoolIdx = (bufPoolIdx + 1) % bufPool.length;
+        return bufPool[bufPoolIdx];
+      },
+      callback: function(nread, buf) {
+        assert.strictEqual(buf, bufPool[bufPoolIdx]);
+        received += nread;
+        incoming.push(Buffer.from(buf.slice(0, nread)));
+      }
+    }
+  }).on('data', common.mustNotCall()).on('end', common.mustCall(() => {
+    assert.strictEqual(received, smallMessage.length);
+    assert.deepStrictEqual(Buffer.concat(incoming), smallMessage);
+    assert.strictEqual(bufPoolUsage, 7);
+  }));
+});
+
+// Test Uint8Array callback support
+tls.createServer(options, common.mustCall(function(socket) {
+  this.close();
+  socket.end(smallMessage);
+})).listen(0, function() {
+  let received = 0;
+  let incoming = new Uint8Array(0);
+  const bufPool = [ new Uint8Array(2), new Uint8Array(2), new Uint8Array(2) ];
+  let bufPoolIdx = -1;
+  let bufPoolUsage = 0;
+  tls.connect({
+    port: this.address().port,
+    rejectUnauthorized: false,
+    onread: {
+      buffer: () => {
+        ++bufPoolUsage;
+        bufPoolIdx = (bufPoolIdx + 1) % bufPool.length;
+        return bufPool[bufPoolIdx];
+      },
+      callback: function(nread, buf) {
+        assert.strictEqual(buf, bufPool[bufPoolIdx]);
+        received += nread;
+        const newIncoming = new Uint8Array(incoming.length + nread);
+        newIncoming.set(incoming);
+        newIncoming.set(buf.slice(0, nread), incoming.length);
+        incoming = newIncoming;
+      }
+    }
+  }).on('data', common.mustNotCall()).on('end', common.mustCall(() => {
+    assert.strictEqual(received, smallMessage.length);
+    assert.deepStrictEqual(incoming, new Uint8Array(smallMessage));
+    assert.strictEqual(bufPoolUsage, 7);
+  }));
+});
+
+// Test explicit socket pause
+tls.createServer(options, common.mustCall(function(socket) {
+  this.close();
+  // Need larger message here to observe the pause
+  socket.end(largeMessage);
+})).listen(0, function() {
+  let received = 0;
+  const buffers = [];
+  const sockBuf = Buffer.alloc(64);
+  let pauseScheduled = false;
+  const client = tls.connect({
+    port: this.address().port,
+    rejectUnauthorized: false,
+    onread: {
+      buffer: sockBuf,
+      callback: function(nread, buf) {
+        assert.strictEqual(buf, sockBuf);
+        received += nread;
+        buffers.push(Buffer.from(buf.slice(0, nread)));
+        if (!pauseScheduled) {
+          pauseScheduled = true;
+          client.pause();
+          setTimeout(() => {
+            client.resume();
+          }, 100);
+        }
+      }
+    }
+  }).on('data', common.mustNotCall()).on('end', common.mustCall(() => {
+    assert.strictEqual(received, largeMessage.length);
+    assert.deepStrictEqual(Buffer.concat(buffers), largeMessage);
+  }));
+});
+
+// Test implicit socket pause
+tls.createServer(options, common.mustCall(function(socket) {
+  this.close();
+  // Need larger message here to observe the pause
+  socket.end(largeMessage);
+})).listen(0, function() {
+  let received = 0;
+  const buffers = [];
+  const sockBuf = Buffer.alloc(64);
+  let pauseScheduled = false;
+  const client = tls.connect({
+    port: this.address().port,
+    rejectUnauthorized: false,
+    onread: {
+      buffer: sockBuf,
+      callback: function(nread, buf) {
+        assert.strictEqual(buf, sockBuf);
+        received += nread;
+        buffers.push(Buffer.from(buf.slice(0, nread)));
+        if (!pauseScheduled) {
+          pauseScheduled = true;
+          setTimeout(() => {
+            client.resume();
+          }, 100);
+          return false;
+        }
+        return true;
+      }
+    }
+  }).on('data', common.mustNotCall()).on('end', common.mustCall(() => {
+    assert.strictEqual(received, largeMessage.length);
+    assert.deepStrictEqual(Buffer.concat(buffers), largeMessage);
+  }));
+});