Commit 45cd4d88 authored by Thomas Markwalder's avatar Thomas Markwalder

[3329] dhcpsrv::D2ClientMgr now registers IfaceMgr

D2ClientMgr now registers and unregisters its runReadyIO method and sender's
select-fd with IfaceMgr's external socket monitoring.
parent 74341d7c
......@@ -12,10 +12,13 @@
#include <dhcp/iface_mgr.h>
#include <dhcp_ddns/ncr_udp.h>
#include <dhcpsrv/d2_client_mgr.h>
#include <dhcpsrv/dhcpsrv_log.h>
#include <boost/bind.hpp>
#include <string>
using namespace std;
......@@ -24,11 +27,13 @@ namespace isc {
namespace dhcp {
D2ClientMgr::D2ClientMgr() : d2_client_config_(new D2ClientConfig()),
name_change_sender_(), private_io_service_(), sender_io_service_(NULL) {
name_change_sender_(), private_io_service_(),
registered_select_fd_(dhcp_ddns::WatchSocket::INVALID_SOCKET) {
// Default constructor initializes with a disabled configuration.
......@@ -209,14 +214,16 @@ D2ClientMgr::startSender(D2ClientErrorHandler error_handler,
// Set the error handler.
client_error_handler_ = error_handler;
// Remember the io service being used.
sender_io_service_ = &io_service;
// Start the sender on the given service.
/// @todo need to register sender's select-fd with IfaceMgr once 3315 is
/// done.
// Register sender's select-fd with IfaceMgr.
// We need to remember the fd that is registered so we can unregister later.
// IO error handling in the sender may alter its select-fd.
registered_select_fd_ = name_change_sender_->getSelectFd();
......@@ -226,14 +233,16 @@ D2ClientMgr::amSending() const {
D2ClientMgr::stopSender() {
if (!name_change_sender_) {
isc_throw(D2ClientError, "D2ClientMgr::stopSender sender is null");
/// Unregister sender's select-fd.
if (registered_select_fd_ != dhcp_ddns::WatchSocket::INVALID_SOCKET) {
registered_select_fd_ = dhcp_ddns::WatchSocket::INVALID_SOCKET;
/// @todo need to unregister sender's select-fd with IfaceMgr once 3315 is
/// done.
// If its not null, call stop.
if (name_change_sender_) {
......@@ -309,17 +318,13 @@ D2ClientMgr::getSelectFd() {
D2ClientMgr::runReadyIO() {
if (!sender_io_service_) {
if (!name_change_sender_) {
// This should never happen.
isc_throw(D2ClientError, "D2ClientMgr::runReadyIO"
" sender io service is null");
" name_change_sender is null");
// We shouldn't be here if IO isn't ready to execute.
// By running poll we're gauranteed not to hang.
/// @todo Trac# 3325 requests that asiolink::IOService provide a
/// wrapper for poll().
}; // namespace dhcp
......@@ -16,7 +16,7 @@
#define D2_CLIENT_MGR_H
/// @file d2_client_mgr.h Defines the D2ClientMgr class.
/// This file defines the class Kea uses to act as a client of the
/// This file defines the class Kea uses to act as a client of the
/// b10-dhcp-ddns module (aka D2).
#include <asiolink/io_address.h>
......@@ -62,13 +62,13 @@ boost::function<void(const dhcp_ddns::NameChangeSender::Result result,
/// used by the NCR IPC with the select-driven IO used by Kea. Senders expose
/// a file descriptor, the "select-fd" that can monitored for read-readiness
/// with the select() function (or variants). D2ClientMgr provides a method,
/// runReadyIO(), that will process all ready events on a sender's
/// IOservice. Track# 3315 is extending Kea's IfaceMgr to support the
/// registration of multiple external sockets with callbacks that are then
/// monitored with IO readiness via select().
/// @todo D2ClientMgr will be modified to register the sender's select-fd and
/// runReadyIO() with IfaceMgr when entering the send mode and will
/// unregister when exiting send mode.
/// runReadyIO(), that will instructs the sender to process the next ready
/// ready IO handler on the sender's IOservice. Track# 3315 extended
/// Kea's IfaceMgr to support the registration of multiple external sockets
/// with callbacks that are then monitored with IO readiness via select().
/// D2ClientMgr registers the sender's select-fd and runReadyIO() with
/// IfaceMgr when entering the send mode and unregisters it when exiting send
/// mode.
/// To place the manager in send mode, the calling layer must supply an error
/// handler and optionally an IOService instance. The error handler is invoked
......@@ -161,7 +161,7 @@ public:
/// Templated wrapper around the analyzeFqdn() allowing that method to
/// be used for either IPv4 or IPv6 processing. This methods resets all
/// of the flags in the response to zero and then sets the S,N, and O
/// flags. Any other flags are the responsiblity of the invoking layer.
/// flags. Any other flags are the responsibility of the invoking layer.
/// @param fqdn FQDN option from which to read client (inbound) flags
/// @param fqdn_resp FQDN option to update with the server (outbound) flags
......@@ -278,14 +278,17 @@ public:
/// @brief Processes sender IO events
/// Runs all handlers ready for execution on the sender's IO service.
/// Serves as callback registered for the sender's select-fd with IfaceMgr.
/// It instructs the sender to execute the next ready IO handler.
/// It provides an instance method that can be bound via boost::bind, as
/// NameChangeSender is abstract.
void runReadyIO();
/// @brief Function operator implementing the NCR sender callback.
/// This method is invoked each time the NameChangeSender completes
/// an asychronous send.
/// an asynchronous send.
/// @param result contains that send outcome status.
/// @param ncr is a pointer to the NameChangeRequest that was
......@@ -307,6 +310,14 @@ protected:
/// mode.
int getSelectFd();
/// @brief Fetches the select-fd that is currently registered.
/// @return The currently registered select-fd or
/// dhcp_ddns::WatchSocket::INVALID_SOCKET.
/// @note This is only exposed for testing purposes.
int getRegisteredSelectFd();
/// @brief Container class for DHCP-DDNS configuration parameters.
D2ClientConfigPtr d2_client_config_;
......@@ -322,12 +333,8 @@ private:
/// completes with a failed status.
D2ClientErrorHandler client_error_handler_;
/// @brief Pointer to the IOService currently being used by the sender.
/// @note We need to remember the io_service given to the sender however
/// we may have received only a referenece to it from the calling layer.
/// Use a raw pointer to store it. This value should never be exposed
/// and is only valid while in send mode.
asiolink::IOService* sender_io_service_;
/// @brief Remembers the select-fd registered with IfaceMgr.
int registered_select_fd_;
template <class T>
......@@ -19,6 +19,7 @@
#include <asio.hpp>
#include <asiolink/io_service.h>
#include <config.h>
#include <dhcp/iface_mgr.h>
#include <dhcpsrv/d2_client_mgr.h>
#include <exceptions/exceptions.h>
......@@ -376,4 +377,45 @@ TEST_F(D2ClientMgrTest, udpSendErrorHandler) {
ASSERT_EQ(1, error_handler_count_);
TEST_F(D2ClientMgrTest, ifaceRegister) {
// Enable DDNS with server at 53001 via UDP.
enableDdns("", 530001, dhcp_ddns::NCR_UDP);
// Place sender in send mode.
// Queue three messages.
for (int i = 0; i < 3; ++i) {
dhcp_ddns::NameChangeRequestPtr ncr = buildTestNcr();
EXPECT_EQ(3, getQueueSize());
// select_fd should evaluate to ready to read.
// Calling receive should complete the first message and start the second.
IfaceMgr::instance().receive4(0, 0);
// Verify the callback hander was invoked, no errors counted.
EXPECT_EQ(2, getQueueSize());
ASSERT_EQ(1, callback_count_);
ASSERT_EQ(0, error_handler_count_);
// Stop the sender. This should complete the second message but leave
// the third in the queue.
EXPECT_EQ(1, getQueueSize());
ASSERT_EQ(2, callback_count_);
ASSERT_EQ(0, error_handler_count_);
// Calling recevie again should have no affect.
IfaceMgr::instance().receive4(0, 0);
EXPECT_EQ(1, getQueueSize());
ASSERT_EQ(2, callback_count_);
ASSERT_EQ(0, error_handler_count_);
} // end of anonymous namespace
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