Rework collect_container_info (..) functions (nanocurrency#4736)

* Move container info classes to separate file

* Introduce better `container_info` class

* Rename legacy to `container_info_entry`

* Conversion

* Test

* Fixes

nano/core_test/node.cpp

@@ -3794,4 +3794,25 @@ TEST (node, local_block_broadcast)
 	node1.network.merge_peer (node2.network.endpoint ());
 	ASSERT_TIMELY (5s, node1.network.find_node_id (node2.get_node_id ()));
 	ASSERT_TIMELY (10s, node2.block (send1->hash ()));
+}
+
+TEST (node, container_info)
+{
+	nano::test::system system;
+	auto & node1 = *system.add_node ();
+	auto & node2 = *system.add_node ();
+
+	// Generate some random activity
+	std::vector<nano::account> accounts;
+	auto dev_genesis_key = nano::dev::genesis_key;
+	system.wallet (0)->insert_adhoc (dev_genesis_key.prv);
+	accounts.push_back (dev_genesis_key.pub);
+	for (int n = 0; n < 10; ++n)
+	{
+		system.generate_activity (node1, accounts);
+	}
+
+	// This should just execute, sanitizers will catch any problems
+	ASSERT_NO_THROW (node1.container_info ());
+	ASSERT_NO_THROW (node2.container_info ());
 }

nano/lib/CMakeLists.txt

@@ -36,6 +36,8 @@ add_library(
   config.hpp
   config.cpp
   configbase.hpp
+  container_info.hpp
+  container_info.cpp
   diagnosticsconfig.hpp
   diagnosticsconfig.cpp
   env.hpp

nano/lib/container_info.cpp

@@ -0,0 +1,41 @@
+#include <nano/lib/container_info.hpp>
+
+nano::container_info_composite::container_info_composite (std::string name) :
+	name (std::move (name))
+{
+}
+
+bool nano::container_info_composite::is_composite () const
+{
+	return true;
+}
+
+void nano::container_info_composite::add_component (std::unique_ptr<container_info_component> child)
+{
+	children.push_back (std::move (child));
+}
+
+std::vector<std::unique_ptr<nano::container_info_component>> const & nano::container_info_composite::get_children () const
+{
+	return children;
+}
+
+std::string const & nano::container_info_composite::get_name () const
+{
+	return name;
+}
+
+nano::container_info_leaf::container_info_leaf (container_info_entry info) :
+	info (std::move (info))
+{
+}
+
+bool nano::container_info_leaf::is_composite () const
+{
+	return false;
+}
+
+nano::container_info_entry const & nano::container_info_leaf::get_info () const
+{
+	return info;
+}

nano/lib/container_info.hpp

@@ -0,0 +1,172 @@
+#pragma once
+
+#include <list>
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace nano
+{
+/* These containers are used to collect information about sequence containers.
+ * It makes use of the composite design pattern to collect information
+ * from sequence containers and sequence containers inside member variables.
+ */
+struct container_info_entry
+{
+	std::string name;
+	size_t count;
+	size_t sizeof_element;
+};
+
+class container_info_component
+{
+public:
+	virtual ~container_info_component () = default;
+	virtual bool is_composite () const = 0;
+};
+
+class container_info_composite : public container_info_component
+{
+public:
+	container_info_composite (std::string name);
+	bool is_composite () const override;
+	void add_component (std::unique_ptr<container_info_component> child);
+	std::vector<std::unique_ptr<container_info_component>> const & get_children () const;
+	std::string const & get_name () const;
+
+private:
+	std::string name;
+	std::vector<std::unique_ptr<container_info_component>> children;
+};
+
+class container_info_leaf : public container_info_component
+{
+public:
+	container_info_leaf (container_info_entry);
+	bool is_composite () const override;
+	container_info_entry const & get_info () const;
+
+private:
+	container_info_entry info;
+};
+}
+
+/*
+ * New version
+ */
+namespace nano
+{
+class container_info;
+
+template <typename T>
+concept sized_container = requires (T a) {
+	typename T::value_type;
+	{
+		a.size ()
+	} -> std::convertible_to<std::size_t>;
+};
+
+template <typename T>
+concept container_info_collectable = requires (T a) {
+	{
+		a.collect_info ()
+	} -> std::convertible_to<container_info>;
+};
+
+class container_info
+{
+public:
+	// Child represented as <name, container_info>
+	// Using pair to avoid problems with incomplete types
+	using child = std::pair<std::string, container_info>;
+
+	struct entry
+	{
+		std::string name;
+		std::size_t size;
+		std::size_t sizeof_element;
+	};
+
+public:
+	/**
+	 * Adds a subcontainer
+	 */
+	void add (std::string const & name, container_info const & info)
+	{
+		children_m.emplace_back (name, info);
+	}
+
+	template <container_info_collectable T>
+	void add (std::string const & name, T const & container)
+	{
+		add (name, container.collect_info ());
+	}
+
+	/**
+	 * Adds an entry to this container
+	 */
+	void put (std::string const & name, std::size_t size, std::size_t sizeof_element = 0)
+	{
+		entries_m.emplace_back (entry{ name, size, sizeof_element });
+	}
+
+	template <class T>
+	void put (std::string const & name, std::size_t size)
+	{
+		put (name, size, sizeof (T));
+	}
+
+	template <sized_container T>
+	void put (std::string const & name, T const & container)
+	{
+		put (name, container.size (), sizeof (typename T::value_type));
+	}
+
+public:
+	bool children_empty () const
+	{
+		return children_m.empty ();
+	}
+
+	auto const & children () const
+	{
+		return children_m;
+	}
+
+	bool entries_empty () const
+	{
+		return entries_m.empty ();
+	}
+
+	auto const & entries () const
+	{
+		return entries_m;
+	}
+
+public:
+	// Needed to convert to legacy container_info_component during transition period
+	std::unique_ptr<nano::container_info_component> to_legacy (std::string const & name) const
+	{
+		auto composite = std::make_unique<nano::container_info_composite> (name);
+
+		// Add entries as leaf components
+		for (const auto & entry : entries_m)
+		{
+			nano::container_info_entry info{ entry.name, entry.size, entry.sizeof_element };
+			composite->add_component (std::make_unique<nano::container_info_leaf> (info));
+		}
+
+		// Recursively convert children to composites and add them
+		for (const auto & [child_name, child] : children_m)
+		{
+			composite->add_component (child.to_legacy (child_name));
+		}
+
+		return composite;
+	}
+
+private:
+	std::list<child> children_m;
+	std::list<entry> entries_m;
+};
+}

nano/lib/observer_set.hpp

@@ -36,15 +36,19 @@ class observer_set final
 		return observers.empty ();
 	}
 
-	std::unique_ptr<container_info_component> collect_container_info (std::string const & name) const
+	size_t size () const
+	{
+		nano::lock_guard<nano::mutex> lock{ mutex };
+		return observers.size ();
+	}
+
+	nano::container_info container_info () const
 	{
 		nano::unique_lock<nano::mutex> lock{ mutex };
-		auto count = observers.size ();
-		lock.unlock ();
-		auto sizeof_element = sizeof (typename decltype (observers)::value_type);
-		auto composite = std::make_unique<container_info_composite> (name);
-		composite->add_component (std::make_unique<container_info_leaf> (container_info{ "observers", count, sizeof_element }));
-		return composite;
+
+		nano::container_info info;
+		info.put ("observers", observers);
+		return info;
 	}
 
 private:

nano/lib/processing_queue.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <nano/lib/container_info.hpp>
 #include <nano/lib/locks.hpp>
 #include <nano/lib/numbers.hpp>
 #include <nano/lib/stats.hpp>
@@ -107,14 +108,13 @@ class processing_queue final
 		return queue.size ();
 	}
 
-public: // Container info
-	std::unique_ptr<container_info_component> collect_container_info (std::string const & name) const
+	nano::container_info container_info () const
 	{
 		nano::lock_guard<nano::mutex> guard{ mutex };
 
-		auto composite = std::make_unique<container_info_composite> (name);
-		composite->add_component (std::make_unique<container_info_leaf> (container_info{ "queue", queue.size (), sizeof (typename decltype (queue)::value_type) }));
-		return composite;
+		nano::container_info info;
+		info.put ("queue", queue);
+		return info;
 	}
 
 private:

nano/lib/thread_pool.cpp

@@ -89,9 +89,9 @@ void nano::thread_pool::set_thread_names (nano::thread_role::name thread_name)
 	thread_names_latch.wait ();
 }
 
-std::unique_ptr<nano::container_info_component> nano::thread_pool::collect_container_info (std::string const & name) const
+nano::container_info nano::thread_pool::container_info () const
 {
-	auto composite = std::make_unique<container_info_composite> (name);
-	composite->add_component (std::make_unique<container_info_leaf> (container_info{ "count", num_queued_tasks (), sizeof (std::function<void ()>) }));
-	return composite;
+	nano::container_info info;
+	info.put ("count", num_queued_tasks ());
+	return info;
 }

nano/lib/thread_pool.hpp

@@ -37,7 +37,7 @@ class thread_pool final
 	/** Returns the number of tasks which are awaiting execution by the thread pool **/
 	uint64_t num_queued_tasks () const;
 
-	std::unique_ptr<nano::container_info_component> collect_container_info (std::string const & name) const;
+	nano::container_info container_info () const;
 
 private:
 	nano::mutex mutex;

nano/lib/uniquer.hpp

@@ -51,13 +51,13 @@ class uniquer final
 		return values.size ();
 	}
 
-	std::unique_ptr<container_info_component> collect_container_info (std::string const & name) const
+	nano::container_info container_info () const
 	{
 		nano::lock_guard<nano::mutex> guard{ mutex };
 
-		auto composite = std::make_unique<container_info_composite> (name);
-		composite->add_component (std::make_unique<container_info_leaf> (container_info{ "cache", values.size (), sizeof (Value) }));
-		return composite;
+		nano::container_info info;
+		info.put ("cache", values);
+		return info;
 	}
 
 	static std::chrono::milliseconds constexpr cleanup_cutoff{ 500 };

nano/lib/utility.cpp

@@ -63,46 +63,6 @@ void nano::initialize_file_descriptor_limit ()
 	}
 }
 
-nano::container_info_composite::container_info_composite (std::string const & name) :
-	name (name)
-{
-}
-
-bool nano::container_info_composite::is_composite () const
-{
-	return true;
-}
-
-void nano::container_info_composite::add_component (std::unique_ptr<container_info_component> child)
-{
-	children.push_back (std::move (child));
-}
-
-std::vector<std::unique_ptr<nano::container_info_component>> const & nano::container_info_composite::get_children () const
-{
-	return children;
-}
-
-std::string const & nano::container_info_composite::get_name () const
-{
-	return name;
-}
-
-nano::container_info_leaf::container_info_leaf (const container_info & info) :
-	info (info)
-{
-}
-
-bool nano::container_info_leaf::is_composite () const
-{
-	return false;
-}
-
-nano::container_info const & nano::container_info_leaf::get_info () const
-{
-	return info;
-}
-
 void nano::remove_all_files_in_dir (std::filesystem::path const & dir)
 {
 	for (auto & p : std::filesystem::directory_iterator (dir))