From 8fd1c68f06221e04ccc5a40a04e0f5aa13bd1792 Mon Sep 17 00:00:00 2001
From: isaacs <i@izs.me>
Date: Fri, 22 Apr 2011 19:31:14 -0700
Subject: [PATCH] A test that running 100 stream pipes in parallel is ok

---
 test/simple/test-stream-pipe-multi.js | 100 ++++++++++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 test/simple/test-stream-pipe-multi.js

diff --git a/test/simple/test-stream-pipe-multi.js b/test/simple/test-stream-pipe-multi.js
new file mode 100644
index 00000000000..a6931ab7a52
--- /dev/null
+++ b/test/simple/test-stream-pipe-multi.js
@@ -0,0 +1,100 @@
+// Test that having a bunch of streams piping in parallel
+// doesn't break anything.
+
+var common = require("../common");
+var assert = require("assert");
+var Stream = require("stream").Stream;
+var rr = [];
+var ww = [];
+var cnt = 100;
+var chunks = 1000;
+var chunkSize = 250;
+var data = new Buffer(chunkSize);
+var wclosed = 0;
+var rclosed = 0;
+
+function FakeStream() {
+  Stream.apply(this);
+  this.wait = false;
+  this.writable = true;
+  this.readable = true;
+}
+
+FakeStream.prototype = Object.create(Stream.prototype);
+
+FakeStream.prototype.write = function(chunk) {
+  console.error(this.ID, "write", this.wait)
+  if (this.wait) {
+    process.nextTick(this.emit.bind(this, "drain"));
+  }
+  this.wait = !this.wait;
+  return this.wait;
+};
+
+FakeStream.prototype.end = function() {
+  this.emit("end");
+  process.nextTick(this.close.bind(this));
+};
+
+// noop - closes happen automatically on end.
+FakeStream.prototype.close = function() {
+  this.emit("close");
+};
+
+
+// expect all streams to close properly.
+process.on("exit", function() {
+  assert.equal(cnt, wclosed, "writable streams closed");
+  assert.equal(cnt, rclosed, "readable streams closed");
+});
+
+for (var i = 0; i < chunkSize; i ++) {
+  chunkSize[i] = i % 256;
+}
+
+for (var i = 0; i < cnt; i++) {
+  var r = new FakeStream();
+  r.on("close", function() {
+    console.error(this.ID, "read close");
+    rclosed++;
+  });
+  rr.push(r);
+
+  var w = new FakeStream();
+  w.on("close", function() {
+    console.error(this.ID, "write close");
+    wclosed++;
+  });
+  ww.push(w);
+
+  r.ID = w.ID = i;
+  r.pipe(w);
+}
+
+// now start passing through data
+// simulate a relatively fast async stream.
+rr.forEach(function (r) {
+  var cnt = chunks;
+  var paused = false;
+
+  r.on("pause", function() {
+    paused = true;
+  });
+
+  r.on("resume", function() {
+    paused = false;
+    step();
+  });
+
+  function step() {
+    r.emit("data", data);
+    if (--cnt === 0) {
+      r.end();
+      return;
+    }
+    if (paused) return;
+    process.nextTick(step);
+  }
+
+  process.nextTick(step);
+});