icinga2/lib/remote/apilistener-sync.cpp

/******************************************************************************
 * Icinga 2                                                                   *
 * Copyright (C) 2012-2014 Icinga Development Team (http://www.icinga.org)    *
 *                                                                            *
 * This program is free software; you can redistribute it and/or              *
 * modify it under the terms of the GNU General Public License                *
 * as published by the Free Software Foundation; either version 2             *
 * of the License, or (at your option) any later version.                     *
 *                                                                            *
 * This program is distributed in the hope that it will be useful,            *
 * but WITHOUT ANY WARRANTY; without even the implied warranty of             *
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the              *
 * GNU General Public License for more details.                               *
 *                                                                            *
 * You should have received a copy of the GNU General Public License          *
 * along with this program; if not, write to the Free Software Foundation     *
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.             *
 ******************************************************************************/

#include "remote/apilistener.h"
#include "remote/apifunction.h"
#include "base/dynamictype.h"
#include "base/logger_fwd.h"
#include "base/convert.h"
#include <boost/foreach.hpp>
#include <fstream>

using namespace icinga;

REGISTER_APIFUNCTION(Update, config, &ApiListener::ConfigUpdateHandler);

bool ApiListener::IsConfigMaster(const Zone::Ptr& zone) const
{
	String path = Application::GetZonesDir() + "/" + zone->GetName();
	return Utility::PathExists(path);
}

void ApiListener::ConfigGlobHandler(const Dictionary::Ptr& config, const String& path, const String& file)
{
	CONTEXT("Creating config update for file '" + file + "'");

	std::ifstream fp(file.CStr());
	if (!fp)
		return;

	String content((std::istreambuf_iterator<char>(fp)), std::istreambuf_iterator<char>());
	config->Set(file.SubStr(path.GetLength()), content);
}

Dictionary::Ptr ApiListener::LoadConfigDir(const String& dir)
{
	Dictionary::Ptr config = make_shared<Dictionary>();
	Utility::GlobRecursive(dir, "*.conf", boost::bind(&ApiListener::ConfigGlobHandler, config, dir, _1), GlobFile);
	return config;
}

bool ApiListener::UpdateConfigDir(const Dictionary::Ptr& oldConfig, const Dictionary::Ptr& newConfig, const String& configDir)
{
	bool configChange = false;

	if (oldConfig->Contains(".timestamp") && newConfig->Contains(".timestamp")) {
		double oldTS = Convert::ToDouble(oldConfig->Get(".timestamp"));
		double newTS = Convert::ToDouble(newConfig->Get(".timestamp"));

		/* skip update if our config is newer */
		if (oldTS <= newTS)
			return false;
	}

	BOOST_FOREACH(const Dictionary::Pair& kv, newConfig) {
		if (oldConfig->Get(kv.first) != kv.second) {
			configChange = true;

			String path = configDir + "/" + kv.first;
			Log(LogInformation, "remote", "Updating configuration file: " + path);

			std::ofstream fp(path.CStr(), std::ofstream::out | std::ostream::trunc);
			fp << kv.second;
			fp.close();
		}
	}

	BOOST_FOREACH(const Dictionary::Pair& kv, oldConfig) {
		if (!newConfig->Contains(kv.first)) {
			configChange = true;

			String path = configDir + "/" + kv.first;
			(void) unlink(path.CStr());
		}
	}

	String tsPath = configDir + "/.timestamp";
	if (!Utility::PathExists(tsPath)) {
		std::ofstream fp(tsPath.CStr(), std::ofstream::out | std::ostream::trunc);
		fp << Utility::GetTime();
		fp.close();
	}

	return configChange;
}

void ApiListener::SyncZoneDir(const Zone::Ptr& zone) const
{
	Log(LogInformation, "remote", "Syncing zone: " + zone->GetName());

	String newDir = Application::GetZonesDir() + "/" + zone->GetName();
	String oldDir = Application::GetLocalStateDir() + "/lib/icinga2/api/zones/" + zone->GetName();

#ifndef _WIN32
	if (mkdir(oldDir.CStr(), 0700) < 0 && errno != EEXIST) {
#else /*_ WIN32 */
	if (mkdir(oldDir.CStr()) < 0 && errno != EEXIST) {
#endif /* _WIN32 */
		BOOST_THROW_EXCEPTION(posix_error()
			<< boost::errinfo_api_function("mkdir")
			<< boost::errinfo_errno(errno)
			<< boost::errinfo_file_name(oldDir));
	}

	Dictionary::Ptr newConfig = LoadConfigDir(newDir);
	Dictionary::Ptr oldConfig = LoadConfigDir(oldDir);

	UpdateConfigDir(oldConfig, newConfig, oldDir);
}

void ApiListener::SyncZoneDirs(void) const
{
	BOOST_FOREACH(const Zone::Ptr& zone, DynamicType::GetObjects<Zone>()) {
		if (!IsConfigMaster(zone))
			continue;

		SyncZoneDir(zone);
	}
}

void ApiListener::SendConfigUpdate(const ApiClient::Ptr& aclient)
{
	Endpoint::Ptr endpoint = aclient->GetEndpoint();
	ASSERT(endpoint);

	Zone::Ptr azone = endpoint->GetZone();
	Zone::Ptr lzone = Zone::GetLocalZone();

	/* don't try to send config updates to our master */
	if (lzone->IsChildOf(azone))
		return;

	Dictionary::Ptr configUpdate = make_shared<Dictionary>();

	String zonesDir = Application::GetLocalStateDir() + "/lib/icinga2/api/zones";

	BOOST_FOREACH(const Zone::Ptr& zone, DynamicType::GetObjects<Zone>()) {
		String zoneDir = zonesDir + "/" + zone->GetName();

		if (!zone->IsChildOf(azone) || !Utility::PathExists(zoneDir))
			continue;

		configUpdate->Set(zone->GetName(), LoadConfigDir(zonesDir + "/" + zone->GetName()));
	}

	Dictionary::Ptr params = make_shared<Dictionary>();
	params->Set("update", configUpdate);

	Dictionary::Ptr message = make_shared<Dictionary>();
	message->Set("jsonrpc", "2.0");
	message->Set("method", "config::Update");
	message->Set("params", params);

	aclient->SendMessage(message);
}

Value ApiListener::ConfigUpdateHandler(const MessageOrigin& origin, const Dictionary::Ptr& params)
{
	if (!origin.FromZone || !Zone::GetLocalZone()->IsChildOf(origin.FromZone))
		return Empty;

	ApiListener::Ptr listener = ApiListener::GetInstance();

	if (!listener || !listener->GetAcceptConfig())
		return Empty;

	Dictionary::Ptr update = params->Get("update");

	bool configChange = false;

	BOOST_FOREACH(const Dictionary::Pair& kv, update) {
		Zone::Ptr zone = Zone::GetByName(kv.first);

		if (!zone) {
			Log(LogWarning, "remote", "Ignoring config update for unknown zone: " + kv.first);
			continue;
		}

		String oldDir = Application::GetLocalStateDir() + "/lib/icinga2/api/zones/" + zone->GetName();

#ifndef _WIN32
		if (mkdir(oldDir.CStr(), 0700) < 0 && errno != EEXIST) {
#else /*_ WIN32 */
		if (mkdir(oldDir.CStr()) < 0 && errno != EEXIST) {
#endif /* _WIN32 */
			BOOST_THROW_EXCEPTION(posix_error()
				<< boost::errinfo_api_function("mkdir")
				<< boost::errinfo_errno(errno)
				<< boost::errinfo_file_name(oldDir));
		}

		Dictionary::Ptr newConfig = kv.second;
		Dictionary::Ptr oldConfig = LoadConfigDir(oldDir);

		if (UpdateConfigDir(oldConfig, newConfig, oldDir))
			configChange = true;
	}

	if (configChange) {
		Log(LogInformation, "remote", "Restarting after configuration change.");
		Application::RequestRestart();
	}

	return Empty;
}