Add event loop with thread pool

I think it works

Signed-off-by: King_DuckZ <king_duckz@gmx.com>

src/evloop.cpp

@@ -0,0 +1,78 @@
+#include "evloop.hpp"
+#include <ev++.h>
+#include <thread>
+#include <vector>
+#include <iostream>
+#include <algorithm>
+#include <random>
+#include <functional>
+#include <taskflow/taskflow.hpp>
+#include <string>
+
+namespace duck {
+namespace {
+	auto time_rand = std::bind(std::uniform_int_distribution<int>(2, 8), std::mt19937(std::time(0)));
+
+	class HtmlFetchTimer : public ev::timer {
+	public:
+		HtmlFetchTimer (ev::loop_ref& loop, tf::Subflow* subflow, std::string&& url) :
+			m_subflow(subflow),
+			m_url(std::move(url))
+		{
+			this->set(loop);
+			this->set<HtmlFetchTimer, &HtmlFetchTimer::on_timer>(this);
+		}
+
+		void on_timer() {
+			m_subflow->emplace([this]() {std::cout << "Timer elapsed for " << m_url << "!\n";});
+		}
+
+		void start (double delay) {
+			ev::timer::start(delay, 0.0);
+		}
+
+	private:
+		tf::Subflow* m_subflow;
+		std::string m_url;
+	};
+
+	class EvThreadPool {
+	public:
+		typedef std::thread thread_t;
+		EvThreadPool() :
+			m_loop(ev::AUTO)
+		{
+		}
+
+		void start() {
+			m_taskflow.emplace([this](tf::Subflow& subflow){main_loop(subflow);});
+			m_executor.run(m_taskflow);
+		}
+
+		void join() {
+			m_executor.wait_for_all();
+			std::cout << "all tasks completed\n";
+		}
+
+	private:
+		void main_loop (tf::Subflow& subflow) {
+			m_timer = std::make_unique<HtmlFetchTimer>(m_loop, &subflow, "lalalala");
+			m_timer->start(static_cast<double>(time_rand()));
+
+			this->m_loop.run(0);
+		}
+
+		ev::default_loop m_loop;
+		tf::Taskflow m_taskflow;
+		tf::Executor m_executor;
+		std::unique_ptr<HtmlFetchTimer> m_timer;
+	};
+} //unnamed namespace
+
+void test() {
+	//const auto processor_count = std::thread::hardware_concurrency();
+	EvThreadPool worker; //(std::max(2U, processor_count) - 1);
+	worker.start();
+	worker.join();
+}
+} //namespace duck

src/evloop.hpp

@@ -0,0 +1,5 @@
+#pragma once
+
+namespace duck {
+	void test();
+} //namespace duck

src/meson.build

@@ -9,6 +9,10 @@ sqlitecpp_dep = dependency('sqlitecpp', version: '>=3.0.0',
   fallback: ['SQLiteCpp', 'sqlitecpp_dep'],
 )
 
+ev_dep = dependency('libev', version: '>=4.31')
+threads_dep = dependency('threads')
+taskflow_dep = dependency('Cpp-Taskflow', version: '>=2.4.0', method: 'cmake')
+
 base_url = get_option('base_url').strip()
 if not base_url.endswith('/')
   base_url = base_url + '/'
@@ -29,8 +33,15 @@ executable(meson.project_name(),
   'oro/dateconv.cpp',
   'oro/items.cpp',
   'oro/shops.cpp',
+  'evloop.cpp',
   project_config_file,
   install: true,
-  dependencies: [restc_cpp_dep, sqlitecpp_dep],
+  dependencies: [
+	restc_cpp_dep,
+	sqlitecpp_dep,
+	ev_dep,
+	threads_dep,
+	taskflow_dep,
+  ],
   include_directories: date_incdir,
 )

subprojects/restc-cpp/meson.build

@@ -1,6 +1,6 @@
 project('restc-cpp', 'cpp',
   version: '0.9.2',
-  meson_version: '>=0.49.2',
+  meson_version: '>=0.50.0',
   default_options: ['cpp_std=gnu++17'],
 )
 
@@ -17,6 +17,7 @@ boost_dep = dependency('boost',
 	'context', 'coroutine', 'chrono', 'log'
   ]
 )
+rapidjson_dep = dependency('RapidJSON')
 
 if not get_option('embedded_restc_cpp')
   if get_option('restc_cpp_with_zlib')
@@ -52,7 +53,13 @@ restc_cpp_target = library(meson.project_name(),
   zipreaderimpl,
   install: true,
   include_directories: [pvt_incdir, pub_incdir],
-  dependencies: [zlib_dep, tls_dep, thread_dep, boost_dep],
+  dependencies: [
+	zlib_dep,
+	tls_dep,
+	thread_dep,
+	boost_dep,
+	rapidjson_dep,
+  ],
   cpp_args: compiler_opts,
 )