/*
** Copyright (C) 2022 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
**
** This program is free software; you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by the
** Free Software Foundation; either version 3, or (at your option) any
** later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software Foundation,
** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**
*/
#include <glib.h>
#include <string>
#include <thread>
#include <vector>
#include <iostream>
#include <fstream>

#include <utils/mu-utils.hh>
#include <utils/mu-regex.hh>
#include <mu-store.hh>
#include "mu-maildir.hh"

#include "utils/mu-test-utils.hh"

using namespace Mu;

constexpr auto test_msg =
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From: Raul Endymion <XXXXXXXXXXXXXXXXXXXX@numerica.us>
To: "'htcondor-users@cs.wisc.edu'" <htcondor-users@cs.wisc.edu>
Thread-topic: OPINIONS WANTED: Are there any blatent downsides I am missing to
	the following Condor configuration
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Subject: [HTCondor-users] OPINIONS WANTED: Are there any blatent downsides I
 am missing to the following Condor configuration
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Hey!

I am architecting our final HTCondor configuration over here and I have =
an idea I am unsure about and I would like to ask some experienced users =
for their opinion.

Background, we have a small, relatively homogenous cluster (with no =
special universes) and less than 10 users. Since each user has their own =
workstation separate from our cluster I thought the following =
configuration would suit our needs, but I want to make sure there isn't =
a huge disadvantage I am missing:

1. Set the Central Manager to be highly available to the point of =
tolerating N cluster machine failures
2. Put a Submit on each of the users' workstations (I am a little =
worried about the resource usage of the condor_shadow and condor_schedd, =
my users are already running into RAM consumption issues over time as it =
is)
3. Place an Execute on each of the cluster machines, which would lead to =
the central manager being on a machine that is also executing jobs

Fortunately both my users' and cluster machines all have access to the =
same network storage, and we have centralized authentication so we can =
just use our users' credentials to authenticate everywhere.=20

Before I set this in dry mud, does anyone have any retrospective =
recommendations I could benefit hearing from, since I am still pretty =
new to the project?

Thank you!
-Raul

Raul Endymion =E2=80=93 Cluster Manager
Numerica Corporation (www.numerica.us)
5042 Technology Parkway #100
Fort Collins, Colorado 80528
=E2=98=8E=EF=B8=8F (970) 207 2233
=F0=9F=93=A7 @ID@XXXXXXXXXXXXXXX@numerica.us



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--===============0678627779074767862==
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_______________________________________________
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--===============0678627779074767862==--)";

static std::string
message(const Regex& rx, size_t id)
{
	char buf[16];
	::snprintf(buf, sizeof(buf), "%zu", id);

	return to_string_gchar(
		g_regex_replace(rx, test_msg, -1, 0, buf,
				G_REGEX_MATCH_DEFAULT, {}));
}

struct TestData {
	size_t num_maildirs;
	size_t num_messages;
	size_t num_threads;
};


static void
setup(const TestData& tdata)
{
	/* create toplevel */
	auto top_maildir = std::string{BENCH_MAILDIRS};
	int res = g_mkdir_with_parents(top_maildir.c_str(), 0700);
	g_assert_cmpuint(res,==, 0);

	/* create maildirs */
	for (size_t i = 0; i != tdata.num_maildirs; ++i) {
		const auto mdir = format("%s/maildir-%zu", top_maildir.c_str(), i);
		auto res = maildir_mkdir(mdir);
		g_assert(!!res);
	}
	const auto rx = Regex::make("@ID@");
	/* create messages */
	for (size_t n = 0; n != tdata.num_messages; ++n) {
		auto mpath = format("%s/maildir-%zu/cur/msg-%zu:2,S",
				    top_maildir.c_str(),
				    n % tdata.num_maildirs,
				    n);
		std::ofstream stream(mpath);
		auto msg = message(*rx, n);
		stream.write(msg.c_str(), msg.size());
		g_assert_true(stream.good());
	}
}

static void
tear_down()
{
	/* ugly */
	GError *err{};
	const auto cmd{format("/bin/rm -rf '%s' '%s'", BENCH_MAILDIRS, BENCH_STORE)};
	if (!g_spawn_command_line_sync(cmd.c_str(), NULL, NULL, NULL, &err)) {
		g_warning("error: %s\n", err ? err->message : "?");
		g_clear_error(&err);
	}
}

void
black_hole(void)
{
	return; /* do nothing */
}

static void
benchmark_indexer(gconstpointer testdata)
{
	using namespace std::chrono_literals;
	using Clock = std::chrono::steady_clock;
	const auto tdata = reinterpret_cast<const TestData*>(testdata);

	setup(*tdata);
	auto start = Clock::now();

	{
		auto store{Store::make_new(BENCH_STORE, BENCH_MAILDIRS, {}, {})};
		g_assert_true(!!store);
		Indexer::Config conf{};
		conf.max_threads = tdata->num_threads;

		auto res = store->indexer().start(conf);
		g_assert_true(res);
		while(store->indexer().is_running()) {
			std::this_thread::sleep_for(100ms);
		}
		g_assert_cmpuint(store->size(),==, tdata->num_messages);
	}

	const auto elapsed = Clock::now() - start;
	std::cout << "indexed " << tdata->num_messages << " messages in "
		  << tdata->num_maildirs << " maildirs in "
		  << to_ms(elapsed) << "ms; "
		  << to_us(elapsed) / tdata->num_messages << " μs/message; "
		  << static_cast<size_t>(1000*tdata->num_messages / to_ms(elapsed))
		  << " messages/s"
		  << " (" << tdata->num_threads << " thread(s))\n";

	tear_down();
}

int
main(int argc, char *argv[])
{
	size_t num_maildirs{}, num_messages{};
	g_test_init(&argc, &argv, nullptr);
	if (g_test_perf()) {
		num_maildirs = 20;
		num_messages = 5000;
	} else {
		num_maildirs = 10;
		num_messages = 1000;
	}

	g_log_set_handler(
	    NULL,
	    (GLogLevelFlags)(G_LOG_LEVEL_MASK | G_LOG_FLAG_FATAL | G_LOG_FLAG_RECURSION),
	    (GLogFunc)black_hole,
	    NULL);


	size_t thread_num{};
	const auto tnum = g_getenv("THREAD_NUM");
	if (tnum)
		thread_num = ::strtol(tnum, NULL, 10);

	if (thread_num != 0) {
		/* THREAD_NUM specified */
		static TestData tdata{num_maildirs, num_messages, thread_num};
		char *name = g_strdup_printf("/bench/indexer/%zu-cores", thread_num);
		g_test_add_data_func(name, &tdata, benchmark_indexer);
		g_free(name);
	} else {
		/* no THREAD_NUM specified */

		const size_t hw_threads = std::thread::hardware_concurrency();

		{
			static TestData tdata{num_maildirs, num_messages, 1};
			g_test_add_data_func("/bench/indexer/1-core", &tdata, benchmark_indexer);
		}

		if (hw_threads > 2) {
			static TestData tdata{num_maildirs, num_messages, hw_threads/2};
			char *name = g_strdup_printf("/bench/indexer/%zu-cores", hw_threads/2);
			g_test_add_data_func(name, &tdata, benchmark_indexer);
			g_free(name);
		}

		if (hw_threads > 1) {
			static TestData tdata{num_maildirs, num_messages, hw_threads};
			char *name = g_strdup_printf("/bench/indexer/%zu-cores", hw_threads);
			g_test_add_data_func(name, &tdata, benchmark_indexer);
			g_free(name);
		}
	}

	tear_down();

	return g_test_run();
}
