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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include "ConnectionHandler.h"
#include "qpid/log/Statement.h"
#include "qpid/framing/amqp_framing.h"
#include "qpid/framing/all_method_bodies.h"
#include "qpid/framing/ClientInvoker.h"
#include "qpid/framing/reply_exceptions.h"
#include "qpid/log/Helpers.h"
using namespace qpid::client;
using namespace qpid::framing;
using namespace qpid::framing::connection;
namespace {
const std::string OK("OK");
const std::string PLAIN("PLAIN");
const std::string en_US("en_US");
const std::string INVALID_STATE_START("start received in invalid state");
const std::string INVALID_STATE_TUNE("tune received in invalid state");
const std::string INVALID_STATE_OPEN_OK("open-ok received in invalid state");
const std::string INVALID_STATE_CLOSE_OK("close-ok received in invalid state");
}
CloseCode ConnectionHandler::convert(uint16_t replyCode)
{
switch (replyCode) {
case 200: return CLOSE_CODE_NORMAL;
case 320: return CLOSE_CODE_CONNECTION_FORCED;
case 402: return CLOSE_CODE_INVALID_PATH;
case 501: default:
return CLOSE_CODE_FRAMING_ERROR;
}
}
ConnectionHandler::ConnectionHandler(const ConnectionSettings& s, ProtocolVersion& v)
: StateManager(NOT_STARTED), ConnectionSettings(s), outHandler(*this), proxy(outHandler),
errorCode(CLOSE_CODE_NORMAL), version(v)
{
insist = true;
ESTABLISHED.insert(FAILED);
ESTABLISHED.insert(CLOSED);
ESTABLISHED.insert(OPEN);
FINISHED.insert(FAILED);
FINISHED.insert(CLOSED);
}
void ConnectionHandler::incoming(AMQFrame& frame)
{
if (getState() == CLOSED) {
throw Exception("Received frame on closed connection");
}
AMQBody* body = frame.getBody();
try {
if (frame.getChannel() != 0 || !invoke(static_cast<ConnectionOperations&>(*this), *body)) {
switch(getState()) {
case OPEN:
in(frame);
break;
case CLOSING:
QPID_LOG(warning, "Ignoring frame while closing connection: " << frame);
break;
default:
throw Exception("Cannot receive frames on non-zero channel until connection is established.");
}
}
}catch(std::exception& e){
QPID_LOG(warning, "Closing connection due to " << e.what());
setState(CLOSING);
errorCode = CLOSE_CODE_FRAMING_ERROR;
errorText = e.what();
proxy.close(501, e.what());
}
}
void ConnectionHandler::outgoing(AMQFrame& frame)
{
if (getState() == OPEN)
out(frame);
else
throw TransportFailure(errorText.empty() ? "Connection is not open." : errorText);
}
void ConnectionHandler::waitForOpen()
{
waitFor(ESTABLISHED);
if (getState() == FAILED || getState() == CLOSED) {
throw ConnectionException(errorCode, errorText);
}
}
void ConnectionHandler::close()
{
switch (getState()) {
case NEGOTIATING:
case OPENING:
fail("Connection closed before it was established");
break;
case OPEN:
setState(CLOSING);
proxy.close(200, OK);
waitFor(FINISHED);
break;
// Nothing to do for CLOSING, CLOSED, FAILED or NOT_STARTED
}
}
void ConnectionHandler::checkState(STATES s, const std::string& msg)
{
if (getState() != s) {
throw CommandInvalidException(msg);
}
}
void ConnectionHandler::fail(const std::string& message)
{
errorCode = CLOSE_CODE_FRAMING_ERROR;
errorText = message;
QPID_LOG(warning, message);
setState(FAILED);
}
void ConnectionHandler::start(const FieldTable& /*serverProps*/, const Array& /*mechanisms*/, const Array& /*locales*/)
{
checkState(NOT_STARTED, INVALID_STATE_START);
setState(NEGOTIATING);
//TODO: verify that desired mechanism and locale are supported
string response = ((char)0) + username + ((char)0) + password;
proxy.startOk(properties, mechanism, response, locale);
}
void ConnectionHandler::secure(const std::string& /*challenge*/)
{
throw NotImplementedException("Challenge-response cycle not yet implemented in client");
}
void ConnectionHandler::tune(uint16_t maxChannelsProposed, uint16_t maxFrameSizeProposed,
uint16_t /*heartbeatMin*/, uint16_t /*heartbeatMax*/)
{
checkState(NEGOTIATING, INVALID_STATE_TUNE);
maxChannels = std::min(maxChannels, maxChannelsProposed);
maxFrameSize = std::min(maxFrameSize, maxFrameSizeProposed);
//TODO: implement heartbeats and check desired value is in valid range
proxy.tuneOk(maxChannels, maxFrameSize, heartbeat);
setState(OPENING);
proxy.open(virtualhost, capabilities, insist);
}
void ConnectionHandler::openOk ( const Array& knownBrokers )
{
checkState(OPENING, INVALID_STATE_OPEN_OK);
knownBrokersUrls.clear();
framing::Array::ValueVector::const_iterator i;
for ( i = knownBrokers.begin(); i != knownBrokers.end(); ++i )
knownBrokersUrls.push_back(Url((*i)->get<std::string>()));
setState(OPEN);
QPID_LOG(debug, "Known-brokers for connection: " << log::formatList(knownBrokersUrls));
}
void ConnectionHandler::redirect(const std::string& /*host*/, const Array& /*knownHosts*/)
{
throw NotImplementedException("Redirection received from broker; not yet implemented in client");
}
void ConnectionHandler::close(uint16_t replyCode, const std::string& replyText)
{
proxy.closeOk();
errorCode = convert(replyCode);
errorText = replyText;
setState(CLOSED);
QPID_LOG(warning, "Broker closed connection: " << replyCode << ", " << replyText);
if (onError) {
onError(replyCode, replyText);
}
}
void ConnectionHandler::closeOk()
{
checkState(CLOSING, INVALID_STATE_CLOSE_OK);
if (onError && errorCode != CLOSE_CODE_NORMAL) {
onError(errorCode, errorText);
} else if (onClose) {
onClose();
}
setState(CLOSED);
}
bool ConnectionHandler::isOpen() const
{
return getState() == OPEN;
}
bool ConnectionHandler::isClosed() const
{
int s = getState();
return s == CLOSED || s == FAILED;
}
bool ConnectionHandler::isClosing() const { return getState() == CLOSING; }
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