testserver.py listens on ephemeral ports by default.

net/test/test_server.cc

Index: net/test/test_server.cc
diff --git a/net/test/test_server.cc b/net/test/test_server.cc
index 4b426eb4e9d28fc5a825f5d3f04b2a986190d8f3..1e6ff642b1291463f5b8b493b1a9c428423c0744 100644
--- a/net/test/test_server.cc
+++ b/net/test/test_server.cc
@@ -40,59 +40,6 @@ const int kServerConnectionAttempts = 10;
 // Connection timeout in milliseconds for tests.
 const int kServerConnectionTimeoutMs = 1000;
 
-const char kTestServerShardFlag[] = "test-server-shard";
-
-int GetHTTPSPortBase(const TestServer::HTTPSOptions& options) {
-  if (options.request_client_certificate)
-    return 9543;
-
-  switch (options.server_certificate) {
-    case TestServer::HTTPSOptions::CERT_OK:
-      return 9443;
-    case TestServer::HTTPSOptions::CERT_MISMATCHED_NAME:
-      return 9643;
-    case TestServer::HTTPSOptions::CERT_EXPIRED:
-      // TODO(phajdan.jr): Some tests rely on this hardcoded value.
-      // Some uses of this are actually in .html/.js files.
-      return 9666;
-    default:
-      NOTREACHED();
-  }
-  return -1;
-}
-
-int GetPortBase(TestServer::Type type,
-                const TestServer::HTTPSOptions& options) {
-  switch (type) {
-    case TestServer::TYPE_FTP:
-      return 3117;
-    case TestServer::TYPE_HTTP:
-      return 1337;
-    case TestServer::TYPE_HTTPS:
-      return GetHTTPSPortBase(options);
-    default:
-      NOTREACHED();
-  }
-  return -1;
-}
-
-int GetPort(TestServer::Type type,
-            const TestServer::HTTPSOptions& options) {
-  int port = GetPortBase(type, options);
-  if (CommandLine::ForCurrentProcess()->HasSwitch(kTestServerShardFlag)) {
-    std::string shard_str(CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
-                              kTestServerShardFlag));
-    int shard = -1;
-    if (base::StringToInt(shard_str, &shard)) {
-      port += shard;
-    } else {
-      LOG(FATAL) << "Got invalid " << kTestServerShardFlag << " flag value. "
-                 << "An integer is expected.";
-    }
-  }
-  return port;
-}
-
 std::string GetHostname(TestServer::Type type,
                         const TestServer::HTTPSOptions& options) {
   if (type == TestServer::TYPE_HTTPS &&
@@ -138,13 +85,16 @@ FilePath TestServer::HTTPSOptions::GetCertificateFile() const {
 }
 
 TestServer::TestServer(Type type, const FilePath& document_root)
-    : type_(type) {
+    : type_(type),
+      started_(false) {
   Init(document_root);
 }
 
 TestServer::TestServer(const HTTPSOptions& https_options,
                        const FilePath& document_root)
-    : https_options_(https_options), type_(TYPE_HTTPS) {
+    : https_options_(https_options),
+      type_(TYPE_HTTPS),
+      started_(false) {
   Init(document_root);
 }
 
@@ -156,8 +106,11 @@ TestServer::~TestServer() {
 }
 
 void TestServer::Init(const FilePath& document_root) {
-  host_port_pair_ = HostPortPair(GetHostname(type_, https_options_),
-                                 GetPort(type_, https_options_));
+  // At this point, the port that the testserver will listen on is unknown.
+  // The testserver will listen on an ephemeral port, and write the port
+  // number out over a pipe that this TestServer object will read from. Once
+  // that is complete, the host_port_pair_ will contain the actual port.
+  host_port_pair_ = HostPortPair(GetHostname(type_, https_options_), 0);
   process_handle_ = base::kNullProcessHandle;
 
   FilePath src_dir;
@@ -202,6 +155,7 @@ bool TestServer::Start() {
     return false;
   }
 
+  started_ = true;
   return true;
 }
 
@@ -209,6 +163,8 @@ bool TestServer::Stop() {
   if (!process_handle_)
     return true;
 
+  started_ = false;
+
   // First check if the process has already terminated.
   bool ret = base::WaitForSingleProcess(process_handle_, 0);
   if (!ret)
@@ -224,6 +180,11 @@ bool TestServer::Stop() {
   return ret;
 }
 
+const HostPortPair& TestServer::host_port_pair() const {
+  DCHECK(started_);
+  return host_port_pair_;
+}
+
 std::string TestServer::GetScheme() const {
   switch (type_) {
     case TYPE_FTP: