/*
 * libjingle
 * Copyright 2004--2011, Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <signal.h>
#include <stdarg.h>

#include "talk/base/gunit.h"
#include "talk/base/logging.h"
#include "talk/base/physicalsocketserver.h"
#include "talk/base/scoped_ptr.h"
#include "talk/base/socket_unittest.h"
#include "talk/base/thread.h"

namespace talk_base {

class PhysicalSocketTest : public SocketTest {
};

TEST_F(PhysicalSocketTest, TestConnect) {
  SocketTest::TestConnect();
}

TEST_F(PhysicalSocketTest, TestConnectWithDnsLookup) {
  SocketTest::TestConnectWithDnsLookup();
}

TEST_F(PhysicalSocketTest, TestConnectFail) {
  SocketTest::TestConnectFail();
}

TEST_F(PhysicalSocketTest, TestConnectWithDnsLookupFail) {
  SocketTest::TestConnectWithDnsLookupFail();
}

#ifdef OSX
// This test crashes the OS X kernel on 10.6 (at bsd/netinet/tcp_subr.c:2118).
TEST_F(PhysicalSocketTest, DISABLED_TestConnectWithClosedSocket) {
#else
TEST_F(PhysicalSocketTest, TestConnectWithClosedSocket) {
#endif
  SocketTest::TestConnectWithClosedSocket();
}

TEST_F(PhysicalSocketTest, TestServerCloseDuringConnect) {
  SocketTest::TestServerCloseDuringConnect();
}

TEST_F(PhysicalSocketTest, TestClientCloseDuringConnect) {
  SocketTest::TestClientCloseDuringConnect();
}

TEST_F(PhysicalSocketTest, TestServerClose) {
  SocketTest::TestServerClose();
}

TEST_F(PhysicalSocketTest, TestCloseInClosedCallback) {
  SocketTest::TestCloseInClosedCallback();
}

TEST_F(PhysicalSocketTest, TestSocketServerWait) {
  SocketTest::TestSocketServerWait();
}

TEST_F(PhysicalSocketTest, TestTcp) {
  SocketTest::TestTcp();
}

TEST_F(PhysicalSocketTest, TestUdp) {
  SocketTest::TestUdp();
}

TEST_F(PhysicalSocketTest, TestGetSetOptions) {
  SocketTest::TestGetSetOptions();
}

#ifdef POSIX

class PosixSignalDeliveryTest : public testing::Test {
 public:
  static void RecordSignal(int signum) {
    signals_received_.push_back(signum);
    signaled_thread_ = Thread::Current();
  }

 protected:
  void SetUp() {
    ss_.reset(new PhysicalSocketServer());
  }

  void TearDown() {
    ss_.reset(NULL);
    signals_received_.clear();
    signaled_thread_ = NULL;
  }

  bool ExpectSignal(int signum) {
    if (signals_received_.empty()) {
      LOG(LS_ERROR) << "ExpectSignal(): No signal received";
      return false;
    }
    if (signals_received_[0] != signum) {
      LOG(LS_ERROR) << "ExpectSignal(): Received signal " <<
          signals_received_[0] << ", expected " << signum;
      return false;
    }
    signals_received_.erase(signals_received_.begin());
    return true;
  }

  bool ExpectNone() {
    bool ret = signals_received_.empty();
    if (!ret) {
      LOG(LS_ERROR) << "ExpectNone(): Received signal " << signals_received_[0]
          << ", expected none";
    }
    return ret;
  }

  static std::vector<int> signals_received_;
  static Thread *signaled_thread_;

  scoped_ptr<PhysicalSocketServer> ss_;
};

std::vector<int> PosixSignalDeliveryTest::signals_received_;
Thread *PosixSignalDeliveryTest::signaled_thread_ = NULL;

// Test receiving a synchronous signal while not in Wait() and then entering
// Wait() afterwards.
TEST_F(PosixSignalDeliveryTest, RaiseThenWait) {
  ss_->SetPosixSignalHandler(SIGTERM, &RecordSignal);
  raise(SIGTERM);
  EXPECT_TRUE(ss_->Wait(0, true));
  EXPECT_TRUE(ExpectSignal(SIGTERM));
  EXPECT_TRUE(ExpectNone());
}

// Test that we can handle getting tons of repeated signals and that we see all
// the different ones.
TEST_F(PosixSignalDeliveryTest, InsanelyManySignals) {
  ss_->SetPosixSignalHandler(SIGTERM, &RecordSignal);
  ss_->SetPosixSignalHandler(SIGINT, &RecordSignal);
  for (int i = 0; i < 10000; ++i) {
    raise(SIGTERM);
  }
  raise(SIGINT);
  EXPECT_TRUE(ss_->Wait(0, true));
  // Order will be lowest signal numbers first.
  EXPECT_TRUE(ExpectSignal(SIGINT));
  EXPECT_TRUE(ExpectSignal(SIGTERM));
  EXPECT_TRUE(ExpectNone());
}

// Test that a signal during a Wait() call is detected.
TEST_F(PosixSignalDeliveryTest, SignalDuringWait) {
  ss_->SetPosixSignalHandler(SIGALRM, &RecordSignal);
  alarm(1);
  EXPECT_TRUE(ss_->Wait(1500, true));
  EXPECT_TRUE(ExpectSignal(SIGALRM));
  EXPECT_TRUE(ExpectNone());
}

class RaiseSigTermRunnable : public Runnable {
  void Run(Thread *thread) {
    thread->socketserver()->Wait(1000, false);

    // Allow SIGTERM. This will be the only thread with it not masked so it will
    // be delivered to us.
    sigset_t mask;
    sigemptyset(&mask);
    pthread_sigmask(SIG_SETMASK, &mask, NULL);

    // Raise it.
    raise(SIGTERM);
  }
};

// Test that it works no matter what thread the kernel chooses to give the
// signal to (since it's not guaranteed to be the one that Wait() runs on).
TEST_F(PosixSignalDeliveryTest, SignalOnDifferentThread) {
  ss_->SetPosixSignalHandler(SIGTERM, &RecordSignal);
  // Mask out SIGTERM so that it can't be delivered to this thread.
  sigset_t mask;
  sigemptyset(&mask);
  sigaddset(&mask, SIGTERM);
  EXPECT_EQ(0, pthread_sigmask(SIG_SETMASK, &mask, NULL));
  // Start a new thread that raises it. It will have to be delivered to that
  // thread. Our implementation should safely handle it and dispatch
  // RecordSignal() on this thread.
  scoped_ptr<Thread> thread(new Thread());
  thread->Start(new RaiseSigTermRunnable());
  EXPECT_TRUE(ss_->Wait(1500, true));
  EXPECT_TRUE(ExpectSignal(SIGTERM));
  EXPECT_EQ(Thread::Current(), signaled_thread_);
  EXPECT_TRUE(ExpectNone());
}

#endif

}  // namespace talk_base