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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 "ProtocolRegistry.h"
#include "qpid/messaging/exceptions.h"
#include "qpid/client/amqp0_10/ConnectionImpl.h"
#include "qpid/client/LoadPlugins.h"
#include "qpid/log/Statement.h"
#include "qpid/Options.h"
#include "qpid/StringUtils.h"
#include "config.h"
#include <map>
#include <sstream>
#include <boost/bind.hpp>
using qpid::types::Variant;
namespace qpid {
namespace messaging {
namespace {
struct ProtocolOptions : qpid::Options
{
std::string protocolDefaults;
ProtocolOptions() : qpid::Options("Protocol Settings")
{
addOptions()
("protocol-defaults", optValue(protocolDefaults, "PROTOCOLS"), "Protocols to use when none are specified");
}
};
const std::string SEPARATOR(", ");
const std::string EMPTY;
std::string join(const std::vector<std::string>& in, const std::string& base=EMPTY, const std::string& separator = SEPARATOR)
{
std::stringstream out;
if (!base.empty()) out << base;
for (std::vector<std::string>::const_iterator i = in.begin(); i != in.end(); ++i) {
if (i != in.begin()) out << separator;
out << *i;
}
return out.str();
}
typedef std::map<std::string, ProtocolRegistry::Factory*> Factories;
ConnectionImpl* create_0_10(const std::string& url, const qpid::types::Variant::Map& options)
{
return new qpid::client::amqp0_10::ConnectionImpl(url, options);
}
class Registry
{
public:
Registry()
{
factories["amqp0-10"] = &create_0_10;
CommonOptions common("", "", QPIDC_CONF_FILE);
ProtocolOptions options;
try {
common.parse(0, 0, common.clientConfig, true);
options.parse (0, 0, common.clientConfig, true);
} catch (const std::exception& e) {
throw qpid::types::Exception(QPID_MSG("Failed to parse options while initialising Protocol Registry: " << e.what()));
}
QPID_LOG(debug, "Protocol defaults: " << options.protocolDefaults);
if (!options.protocolDefaults.empty()) {
split(versions, options.protocolDefaults, ", ");
}
}
ProtocolRegistry::Factory* find(const std::string& name) const
{
Factories::const_iterator i = factories.find(name);
if (i == factories.end()) {
std::stringstream error;
error << "Unsupported protocol: " << name;
error << " (valid values are " << getNames() << ")";
throw MessagingException(error.str());
} else {
return i->second;
}
}
void add(const std::string& name, ProtocolRegistry::Factory* factory)
{
factories[name] = factory;
}
std::string getNames() const
{
std::stringstream names;
for (Factories::const_iterator i = factories.begin(); i != factories.end(); ++i) {
if (i != factories.begin()) names << ", ";
names << i->first;
}
return names.str();
}
void collectNames(std::vector<std::string>& names) const
{
for (std::vector< std::string >::const_iterator i = versions.begin(); i != versions.end(); ++i) {
Factories::const_iterator j = factories.find(*i);
if (j == factories.end()) {
QPID_LOG(notice, "Unsupported protocol specified in defaults " << *i);
} else {
names.push_back(*i);
}
}
if (names.empty()) {
if (!versions.empty()) {
QPID_LOG(warning, "Protocol defaults specified are not valid (" << join(versions) << ") falling back to " << getNames());
}
for (Factories::const_iterator i = factories.begin(); i != factories.end(); ++i) {
names.push_back(i->first);
}
}
}
private:
Factories factories;
std::vector<std::string> versions;
};
Registry& theRegistry()
{
static Registry factories;
return factories;
}
bool extract(const std::string& key, Variant& value, const Variant::Map& in, Variant::Map& out)
{
bool matched = false;
for (Variant::Map::const_iterator i = in.begin(); i != in.end(); ++i) {
if (i->first == key) {
value = i->second;
matched = true;
} else {
out.insert(*i);
}
}
return matched;
}
}
ConnectionImpl* ProtocolRegistry::create(const std::string& url, const Variant::Map& options)
{
qpid::client::theModuleLoader();//ensure modules are loaded
Variant name;
Variant::Map stripped;
std::vector<std::string> versions;
if (extract("protocol", name, options, stripped)) {
split(versions, name.asString(), ", ");
} else {
theRegistry().collectNames(versions);
}
bool debugOn;
QPID_LOG_TEST(debug, debugOn);
if (debugOn) {
QPID_LOG(debug, "Trying versions " << join(versions));
}
return createInternal(versions, url, stripped, join(versions, "No suitable protocol version supported by peer, tried "));
}
ConnectionImpl* ProtocolRegistry::createInternal(const std::vector<std::string>& requested, const std::string& url, const Variant::Map& options, const std::string& error)
{
std::vector<std::string>::const_iterator i = requested.begin();
if (i == requested.end())
throw MessagingException(error);
std::string name = *i;
ConnectionImpl* result = theRegistry().find(name)(url, options);
result->next = boost::bind(&ProtocolRegistry::createInternal, std::vector<std::string>(++i, requested.end()), url, options, error);
return result;
}
ConnectionImpl* ProtocolRegistry::next(ConnectionImpl* last)
{
if (last->next) {
return last->next();
}
throw MessagingException("No suitable protocol version supported by peer");
}
void ProtocolRegistry::add(const std::string& name, Factory* factory)
{
theRegistry().add(name, factory);
}
}} // namespace qpid::messaging
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