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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 "qpid/broker/Selector.h"
#include "qpid/amqp/CharSequence.h"
#include "qpid/broker/Message.h"
#include "qpid/amqp/MapHandler.h"
#include "qpid/broker/SelectorExpression.h"
#include "qpid/broker/SelectorValue.h"
#include "qpid/log/Statement.h"
#include "qpid/types/Variant.h"
#include <string>
#include <sstream>
#include "qpid/sys/unordered_map.h"
#include <boost/lexical_cast.hpp>
#include <boost/ptr_container/ptr_vector.hpp>
namespace qpid {
namespace broker {
using std::string;
using qpid::sys::unordered_map;
using qpid::amqp::CharSequence;
using qpid::amqp::MapHandler;
/**
* Identifier (amqp.) | JMS... | amqp 1.0 equivalent
* durable | | durable header section
* delivery_mode | DeliveryMode | [durable ? 'PERSISTENT' : 'NON_PERSISTENT'] (computed value)
* priority | Priority | priority header section
* delivery_count | | delivery-count header section
* redelivered |[Redelivered] | (delivery_count>0) (computed value)
* correlation_id | CorrelationID| correlation-id properties section
* to |[Destination] | to properties section
* absolute_expiry_time |[Expiration] | absolute-expiry-time properties section
* message_id | MessageID | message-id properties section
* reply_to |[ReplyTo] | reply-to properties section
* creation_time | Timestamp | creation-time properties section
* jms_type | Type | jms-type message-annotations section
*/
const string EMPTY;
const string PERSISTENT("PERSISTENT");
const string NON_PERSISTENT("NON_PERSISTENT");
const Value specialValue(const Message& msg, const string& id)
{
// TODO: Just use a simple if chain for now - improve this later
if ( id=="delivery_mode" ) {
return msg.getEncoding().isPersistent() ? PERSISTENT : NON_PERSISTENT;
} else if ( id=="redelivered" ) {
return msg.getDeliveryCount()>0 ? true : false;
} else if ( id=="priority" ) {
return int64_t(msg.getPriority());
} else if ( id=="correlation_id" ) {
return EMPTY; // Needs an indirection in getEncoding().
} else if ( id=="message_id" ) {
return EMPTY; // Needs an indirection in getEncoding().
} else if ( id=="to" ) {
return EMPTY; // This is good for 0-10, not sure about 1.0
} else if ( id=="reply_to" ) {
return EMPTY; // Needs an indirection in getEncoding().
} else if ( id=="absolute_expiry_time" ) {
return EMPTY; // Needs an indirection in getEncoding().
} else if ( id=="creation_time" ) {
return EMPTY; // Needs an indirection in getEncoding().
} else if ( id=="jms_type" ) {
return EMPTY;
} else return Value();
}
class MessageSelectorEnv : public SelectorEnv {
const Message& msg;
mutable boost::ptr_vector<string> returnedStrings;
mutable unordered_map<string, Value> returnedValues;
mutable bool valuesLookedup;
const Value& value(const string&) const;
public:
MessageSelectorEnv(const Message&);
};
MessageSelectorEnv::MessageSelectorEnv(const Message& m) :
msg(m),
valuesLookedup(false)
{
}
struct ValueHandler : public broker::MapHandler {
unordered_map<string, Value>& values;
boost::ptr_vector<string>& strings;
ValueHandler(unordered_map<string, Value>& v, boost::ptr_vector<string>& s) :
values(v),
strings(s)
{}
template <typename T>
void handle(const CharSequence& key, const T& value)
{
values[string(key.data, key.size)] = value;
}
void handleVoid(const CharSequence&) {}
void handleBool(const CharSequence& key, bool value) { handle<bool>(key, value); }
void handleUint8(const CharSequence& key, uint8_t value) { handle<int64_t>(key, value); }
void handleUint16(const CharSequence& key, uint16_t value) { handle<int64_t>(key, value); }
void handleUint32(const CharSequence& key, uint32_t value) { handle<int64_t>(key, value); }
void handleUint64(const CharSequence& key, uint64_t value) {
if ( value>uint64_t(std::numeric_limits<int64_t>::max()) ) {
handle<double>(key, value);
} else {
handle<int64_t>(key, value);
}
}
void handleInt8(const CharSequence& key, int8_t value) { handle<int64_t>(key, value); }
void handleInt16(const CharSequence& key, int16_t value) { handle<int64_t>(key, value); }
void handleInt32(const CharSequence& key, int32_t value) { handle<int64_t>(key, value); }
void handleInt64(const CharSequence& key, int64_t value) { handle<int64_t>(key, value); }
void handleFloat(const CharSequence& key, float value) { handle<double>(key, value); }
void handleDouble(const CharSequence& key, double value) { handle<double>(key, value); }
void handleString(const CharSequence& key, const CharSequence& value, const CharSequence&) {
strings.push_back(new string(value.data, value.size));
handle(key, strings[strings.size()-1]);
}
};
const Value& MessageSelectorEnv::value(const string& identifier) const
{
// Check for amqp prefix and strip it if present
if ( identifier.substr(0, 5) == "amqp." ) {
if ( returnedValues.count(identifier)==0 ) {
QPID_LOG(debug, "Selector lookup special identifier: " << identifier);
returnedValues[identifier] = specialValue(msg, identifier.substr(5));
}
} else if (!valuesLookedup) {
QPID_LOG(debug, "Selector lookup triggered by: " << identifier);
// Iterate over all the message properties
ValueHandler handler(returnedValues, returnedStrings);
msg.getEncoding().processProperties(handler);
valuesLookedup = true;
// Anything that wasn't found will have a void value now
}
const Value& v = returnedValues[identifier];
QPID_LOG(debug, "Selector identifier: " << identifier << "->" << v);
return v;
}
Selector::Selector(const string& e)
try :
parse(TopExpression::parse(e)),
expression(e)
{
bool debugOut;
QPID_LOG_TEST(debug, debugOut);
if (debugOut) {
std::stringstream ss;
parse->repr(ss);
QPID_LOG(debug, "Selector parsed[" << e << "] into: " << ss.str());
}
}
catch (std::range_error& ex) {
QPID_LOG(debug, "Selector failed[" << e << "] -> " << ex.what());
throw;
}
Selector::~Selector()
{
}
bool Selector::eval(const SelectorEnv& env)
{
return parse->eval(env);
}
bool Selector::filter(const Message& msg)
{
const MessageSelectorEnv env(msg);
return eval(env);
}
namespace {
const boost::shared_ptr<Selector> NULL_SELECTOR = boost::shared_ptr<Selector>();
}
boost::shared_ptr<Selector> returnSelector(const string& e)
{
if (e.empty()) return NULL_SELECTOR;
return boost::shared_ptr<Selector>(new Selector(e));
}
}}
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