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#pragma once
#include "data_types.hpp"
namespace phosphor
{
namespace dbus
{
namespace monitoring
{
class Monitor;
/**
* @brief Create a condition function object
*
* @param[in] condition - The condition being created
*
* @return - The created condition function object
*/
template <typename T>
auto make_condition(T&& condition)
{
return Condition(std::forward<T>(condition));
}
/**
* @brief Create an action function object
*
* @param[in] action - The action being created
*
* @return - The created action function object
*/
template <typename T>
auto make_action(T&& action)
{
return Action(std::forward<T>(action));
}
/**
* @struct Property Changed Condtion
* @brief A match filter functor to test Dbus property value changed signals
*
* @tparam T - The type of the property value
* @tparam U - The type of the condition
*/
template <typename T, typename U>
struct PropertyChangedCondition
{
PropertyChangedCondition() = delete;
~PropertyChangedCondition() = default;
PropertyChangedCondition(const PropertyChangedCondition&) = default;
PropertyChangedCondition& operator=(const PropertyChangedCondition&) =
default;
PropertyChangedCondition(PropertyChangedCondition&&) = default;
PropertyChangedCondition& operator=(PropertyChangedCondition&&) =
default;
PropertyChangedCondition(const char* iface, const char* property,
U&& condition) :
_iface(iface),
_property(property),
_condition(std::forward<U>(condition)) { }
/** @brief Test a property value.
*
* Extract the property from the PropertiesChanged
* message and run the condition test.
*/
bool operator()(
sdbusplus::bus::bus&,
sdbusplus::message::message& msg,
Monitor&) const
{
std::map<std::string, sdbusplus::message::variant<T>> properties;
const char* iface = nullptr;
msg.read(iface);
if (!iface || strcmp(iface, _iface))
{
return false;
}
msg.read(properties);
auto it = properties.find(_property);
if (it == properties.cend())
{
return false;
}
return _condition(
std::forward<T>(it->second.template get<T>()));
}
private:
const char* _iface;
const char* _property;
U _condition;
};
/**
* @struct Property Condition Base
* @brief A match filter functor to test property values
* @details The base property condition struct that retrieves the property value
* for a property condition
*/
struct PropertyConditionBase
{
PropertyConditionBase() = delete;
virtual ~PropertyConditionBase() = default;
PropertyConditionBase(const PropertyConditionBase&) = default;
PropertyConditionBase& operator=(const PropertyConditionBase&) = default;
PropertyConditionBase(PropertyConditionBase&&) = default;
PropertyConditionBase& operator=(PropertyConditionBase&&) = default;
/** @brief Constructor
*
* The service argument can be nullptr. If something
* else is provided the function will call the the
* service directly. If omitted, the function will
* look up the service in the ObjectMapper.
*
* @param path - The path of the object containing
* the property to be tested.
* @param iface - The interface hosting the property
* to be tested.
* @param property - The property to be tested.
* @param service - The DBus service hosting the object.
*/
PropertyConditionBase(
const char* path,
const char* iface,
const char* property,
const char* service) :
_path(path ? path : std::string()),
_iface(iface),
_property(property),
_service(service) {}
/** @brief Forward comparison to type specific implementation. */
virtual bool eval(sdbusplus::message::message&) const = 0;
/** @brief Test a property value.
*
* Make a DBus call and test the value of any property.
*/
bool operator()(
sdbusplus::bus::bus&,
sdbusplus::message::message&,
Monitor&) const;
private:
std::string _path;
std::string _iface;
std::string _property;
const char* _service;
};
/**
* @struct Property Condtion
* @brief A match filter functor to test property values
*
* @tparam T - The type of the property value
* @tparam U - The type of the condition
*/
template <typename T, typename U>
struct PropertyCondition final : public PropertyConditionBase
{
PropertyCondition() = delete;
~PropertyCondition() = default;
PropertyCondition(const PropertyCondition&) = default;
PropertyCondition& operator=(const PropertyCondition&) = default;
PropertyCondition(PropertyCondition&&) = default;
PropertyCondition& operator=(PropertyCondition&&) = default;
/** @brief Constructor
*
* The service argument can be nullptr. If something
* else is provided the function will call the the
* service directly. If omitted, the function will
* look up the service in the ObjectMapper.
*
* @param path - The path of the object containing
* the property to be tested.
* @param iface - The interface hosting the property
* to be tested.
* @param property - The property to be tested.
* @param condition - The test to run on the property.
* @param service - The DBus service hosting the object.
*/
PropertyCondition(
const char* path,
const char* iface,
const char* property,
U&& condition,
const char* service) :
PropertyConditionBase(path, iface, property, service),
_condition(std::forward<decltype(condition)>(condition)) {}
/** @brief Test a property value.
*
* Make a DBus call and test the value of any property.
*/
bool eval(sdbusplus::message::message& msg) const override
{
sdbusplus::message::variant<T> value;
msg.read(value);
return _condition(std::forward<T>(value.template get<T>()));
}
private:
U _condition;
};
/**
* @brief Used to process a Dbus property changed signal event
*
* @param[in] iface - Item value interface
* @param[in] property - Item value property
* @param[in] condition - Condition function to perform
*
* @tparam T - The type of the property
* @tparam U - The type of the condition
*/
template <typename T, typename U>
auto propertySignal(const char* iface,
const char* property,
U&& condition)
{
return PropertyChangedCondition<T, U>(iface,
property,
std::move(condition));
}
/**
* @brief Used to process conditions on a start event
*
* @param[in] path - Item's Dbus path
* @param[in] iface - Item value interface
* @param[in] property - Item value property
* @param[in] condition - Condition function to perform
* @param[in] service - Service to lookup Dbus object
*
* @tparam T - The type of the property
* @tparam U - The type of the condition
*/
template <typename T, typename U>
auto propertyStart(const char* path,
const char* iface,
const char* property,
U&& condition,
const char* service = nullptr)
{
return PropertyCondition<T, U>(path,
iface,
property,
std::move(condition),
service);
}
} // namespace monitoring
} // namespace dbus
} // namespace phosphor
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