Commit 82a6390b authored by Marcin Siodelski's avatar Marcin Siodelski

[5318] Added unit tests for long connections in DHCPv6.

parent c932ebf8
......@@ -327,8 +327,8 @@ public:
}
/// @brief Command handler which generates long response
static ConstElementPtr longResponseHandler(const std::string&,
const ConstElementPtr&) {
static ConstElementPtr longResponseHandler(const std::string&,
const ConstElementPtr&) {
ElementPtr arguments = Element::createList();
std::string arg = "responseresponseresponseresponseresponseresponse"
"response";
......
......@@ -31,6 +31,8 @@
#include <sys/ioctl.h>
#include <cstdlib>
#include <thread>
using namespace std;
using namespace isc::asiolink;
using namespace isc::config;
......@@ -43,7 +45,31 @@ using namespace isc::test;
namespace {
/// @brief Simple RAII class which stops IO service upon destruction
/// of the object.
class IOServiceWork {
public:
/// @brief Constructor.
///
/// @param io_service Pointer to the IO service to be stopped.
IOServiceWork(const IOServicePtr& io_service)
: io_service_(io_service) {
}
/// @brief Destructor.
///
/// Stops IO service.
~IOServiceWork() {
io_service_->stop();
}
private:
/// @brief Pointer to the IO service to be stopped upon destruction.
IOServicePtr io_service_;
};
class NakedControlledDhcpv6Srv: public ControlledDhcpv6Srv {
// "Naked" DHCPv6 server, exposes internal fields
......@@ -306,6 +332,18 @@ public:
ADD_FAILURE() << "Invalid expected status: " << exp_status;
}
}
/// @brief Command handler which generates long response
static ConstElementPtr longResponseHandler(const std::string&,
const ConstElementPtr&) {
ElementPtr arguments = Element::createList();
std::string arg = "responseresponseresponseresponseresponseresponse"
"response";
for (unsigned i = 0; i < 8000; ++i) {
arguments->add(Element::create(arg));
}
return (createAnswer(0, arguments));
}
};
......@@ -1131,5 +1169,205 @@ TEST_F(CtrlChannelDhcpv6SrvTest, concurrentConnections) {
ASSERT_NO_THROW(getIOService()->poll());
}
// This test verifies that the server can receive and process a large command.
TEST_F(CtrlChannelDhcpv6SrvTest, longCommand) {
createUnixChannelServer();
std::string response;
std::thread th([this, &response]() {
// IO service will be stopped automatically when this object goes
// out of scope and is destroyed. This is useful because we use
// asserts which may break the thread in various exit points.
IOServiceWork work(getIOService());
// Create client which we will use to send command to the server.
boost::scoped_ptr<UnixControlClient> client(new UnixControlClient());
ASSERT_TRUE(client);
// Connect to the server. This will trigger acceptor handler on the
// server side and create a new connection.
ASSERT_TRUE(client->connectToServer(socket_path_));
// This counter will hold the number of bytes transferred to the server
// so far.
size_t bytes_transferred = 0;
// This is the desired size of the command sent to the server (1MB). The
// actual size sent will be slightly greater than that.
const size_t command_size = 1024 * 1000;
bool first_payload = true;
// If we still haven't sent the entire command, continue sending.
while (bytes_transferred < command_size) {
// We're sending command 'foo' with arguments being a list of
// strings. If this is the first transmission, send command name
// and open the arguments list.
if (bytes_transferred == 0) {
std::string preamble = "{ \"command\": \"foo\", \"arguments\": [ ";
ASSERT_TRUE(client->sendCommand(preamble));
// Store the number of bytes sent.
bytes_transferred += preamble.size();
} else {
// We have already transmitted command name and arguments. Now
// we send the list of 'blabla' strings.
std::ostringstream payload;
// If this is not the first parameter in on the list it must be
// prefixed with a comma.
if (!first_payload) {
payload << ", ";
}
first_payload = false;
payload << "\"blablablablablablablablablablablablablablablabla\"";
// If we have hit the limit of the command size, close braces to
// get appropriate JSON.
if (bytes_transferred + payload.tellp() > command_size) {
payload << "] }";
}
// Send the payload.
ASSERT_TRUE(client->sendCommand(payload.str()));
// Update the number of bytes sent.
bytes_transferred += payload.tellp();
}
}
// Set timeout to 5 seconds to allow the time for the server to send
// a response.
const unsigned int timeout = 5;
ASSERT_TRUE(client->getResponse(response, timeout));
// We're done. Close the connection to the server.
client->disconnectFromServer();
});
// Run the server until the command has been processed and response
// received.
getIOService()->run();
// Wait for the thread to complete.
th.join();
EXPECT_EQ("{ \"result\": 2, \"text\": \"'foo' command not supported.\" }",
response);
}
// This test verifies that the server can send long response to the client.
TEST_F(CtrlChannelDhcpv6SrvTest, longResponse) {
// We need to generate large response. The simplest way is to create
// a command and a handler which will generate some static response
// of a desired size.
ASSERT_NO_THROW(
CommandMgr::instance().registerCommand("foo",
boost::bind(&CtrlChannelDhcpv6SrvTest::longResponseHandler, _1, _2));
);
createUnixChannelServer();
// The UnixControlClient doesn't have any means to check that the entire
// response has been received. What we want to do is to generate a
// reference response using our command handler and then compare
// what we have received over the unix domain socket with this reference
// response to figure out when to stop receiving.
std::string reference_response = longResponseHandler("foo", ConstElementPtr())->str();
// In this stream we're going to collect out partial responses.
std::ostringstream response;
// The client is synchronous so it is useful to run it in a thread.
std::thread th([this, &response, reference_response]() {
// IO service will be stopped automatically when this object goes
// out of scope and is destroyed. This is useful because we use
// asserts which may break the thread in various exit points.
IOServiceWork work(getIOService());
// Remember the response size so as we know when we should stop
// receiving.
const size_t long_response_size = reference_response.size();
// Create the client and connect it to the server.
boost::scoped_ptr<UnixControlClient> client(new UnixControlClient());
ASSERT_TRUE(client);
ASSERT_TRUE(client->connectToServer(socket_path_));
// Send the stub command.
std::string command = "{ \"command\": \"foo\", \"arguments\": { } }";
ASSERT_TRUE(client->sendCommand(command));
// Keep receiving response data until we have received the full answer.
while (response.tellp() < long_response_size) {
std::string partial;
const unsigned int timeout = 5;
ASSERT_TRUE(client->getResponse(partial, 5));
response << partial;
}
// We have received the entire response, so close the connection and
// stop the IO service.
client->disconnectFromServer();
});
// Run the server until the entire response has been received.
getIOService()->run();
// Wait for the thread to complete.
th.join();
// Make sure we have received correct response.
EXPECT_EQ(reference_response, response.str());
}
// This test verifies that the server signals timeout if the transmission
// takes too long.
TEST_F(CtrlChannelDhcpv6SrvTest, connectionTimeout) {
createUnixChannelServer();
// Server's response will be assigned to this variable.
std::string response;
// It is useful to create a thread and run the server and the client
// at the same time and independently.
std::thread th([this, &response]() {
// IO service will be stopped automatically when this object goes
// out of scope and is destroyed. This is useful because we use
// asserts which may break the thread in various exit points.
IOServiceWork work(getIOService());
// Create the client and connect it to the server.
boost::scoped_ptr<UnixControlClient> client(new UnixControlClient());
ASSERT_TRUE(client);
ASSERT_TRUE(client->connectToServer(socket_path_));
// Send partial command. The server will be waiting for the remaining
// part to be sent and will eventually signal a timeout.
std::string command = "{ \"command\": \"foo\" ";
ASSERT_TRUE(client->sendCommand(command));
// Let's wait up to 10s for the server's response. The response
// should arrive sooner assuming that the timeout mechanism for
// the server is working properly.
const unsigned int timeout = 10;
ASSERT_TRUE(client->getResponse(response, 10));
// Explicitly close the client's connection.
client->disconnectFromServer();
});
// Run the server until stopped.
getIOService()->run();
// Wait for the thread to return.
th.join();
// Check that the server has signalled a timeout.
EXPECT_EQ("{ \"result\": 1, \"text\": \"Connection over control channel"
" timed out\" }", response);
}
} // End of anonymous namespace
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