mirror of
https://github.com/matrix-construct/construct
synced 2024-11-18 07:50:57 +01:00
424 lines
8 KiB
C++
424 lines
8 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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///////////////////////////////////////////////////////////////////////////////
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//
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// util/util.h
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//
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size_t
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ircd::util::size(std::ostream &s)
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{
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const auto cur(s.tellp());
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s.seekp(0, std::ios::end);
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const auto ret(s.tellp());
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s.seekp(cur, std::ios::beg);
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return ret;
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// util/env.h
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//
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ircd::string_view
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ircd::util::getenv(const string_view &key)
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{
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thread_local char keystr[128];
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if(unlikely(size(key) >= sizeof(keystr)))
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throw error
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{
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"getenv(): variable key is too long."
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};
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// Ensure the key is null terminated for the std:: call.
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const size_t len
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{
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strlcpy(keystr, key)
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};
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const string_view var
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{
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std::getenv(keystr)
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};
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return var;
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// util/pretty.h
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//
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//
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// Human readable time suite
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//
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ircd::string_view
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ircd::util::pretty_nanoseconds(const mutable_buffer &out,
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const long double &ns,
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const uint &fmt)
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{
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using formats = std::array<string_view, 2>;
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using element = std::tuple<formats, double>;
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static const std::array<element, 9> unit
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{{
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// fmt=0 fmt=1
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{ { "nanoseconds", "ns" }, 1000.0L },
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{ { "microseconds", "us" }, 1000.0L },
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{ { "milliseconds", "ms" }, 1000.0L },
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{ { "seconds", "s" }, 60.0L },
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{ { "minutes", "m" }, 60.0L },
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{ { "hours", "h" }, 24.0L },
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{ { "days", "d" }, 7.0L },
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{ { "weeks", "w" }, 4.0L },
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{ { "months", "M" }, 12.0L },
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}};
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const string_view &fmtstr
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{
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fmt == 1?
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"%.2lf%s"_sv:
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"%.2lf %s"_sv
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};
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size_t i(0), pos(0);
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long double val(ns);
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for(; val > std::get<1>(unit.at(pos)) && pos < unit.size() - 1; ++pos)
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val /= std::get<1>(unit.at(pos));
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return fmt::sprintf
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{
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out, fmtstr, val, std::get<0>(unit.at(pos)).at(fmt)
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};
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}
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//
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// Human readable space suite
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//
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decltype(ircd::util::pretty_fmt)
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ircd::util::pretty_fmt
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{
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"%.2lf %s (%lu)"_sv,
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"%.2lf %s"_sv,
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"%.2lf%s"_sv,
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string_view{},
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};
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std::string
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ircd::util::pretty(const human_readable_size &value,
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const uint &fmt)
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{
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return pretty(value, pretty_fmt[fmt]);
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}
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ircd::string_view
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ircd::util::pretty(const mutable_buffer &out,
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const human_readable_size &value,
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const uint &fmt)
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{
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return pretty(out, pretty_fmt[fmt], value);
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}
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std::string
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ircd::util::pretty(const human_readable_size &value,
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const string_view &fmt)
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{
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return util::string(64, [&value, &fmt]
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(const mutable_buffer &out)
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{
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return pretty(out, fmt, value);
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});
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}
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ircd::string_view
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ircd::util::pretty(const mutable_buffer &out,
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const string_view &fmt,
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const human_readable_size &value)
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try
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{
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return fmt::sprintf
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{
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out, fmt,
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std::get<long double>(value),
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std::get<const string_view &>(value),
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std::get<uint64_t>(value)
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};
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}
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catch(const std::out_of_range &e)
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{
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return fmt::sprintf
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{
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out, "%lu",
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std::get<uint64_t>(value)
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};
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}
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ircd::human_readable_size
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ircd::util::si(const uint64_t &value)
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{
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static const std::array<string_view, 7> unit
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{
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" ", "K", "M", "G", "T", "P", "E"
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};
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auto pos(0);
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long double v(value);
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for(; v > 1000.0; v /= 1000.0, ++pos);
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return
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{
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value, v, unit.at(pos)
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};
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}
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ircd::human_readable_size
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ircd::util::iec(const uint64_t &value)
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{
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static const std::array<string_view, 7> unit
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{
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"B", "KiB", "MiB", "GiB", "TiB", "PiB", "EiB"
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};
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auto pos(0);
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long double v(value);
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for(; v > 1024.0; v /= 1024.0, ++pos);
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return
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{
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value, v, unit.at(pos)
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};
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// util/string.h
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//
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/// Close over the common pattern to write directly into a post-C++11 standard
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/// string through the data() member requiring a const_cast. Closure returns
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/// a view of the data actually written to the buffer.
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std::string
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ircd::util::string(const size_t &size,
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const string_closure_view &closure)
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{
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return string(size, [&closure]
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(const mutable_buffer &buffer)
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{
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return ircd::size(closure(buffer));
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});
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}
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/// Close over the common pattern to write directly into a post-C++11 standard
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/// string through the data() member requiring a const_cast. Closure returns
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/// the final size of the data written into the buffer.
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std::string
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ircd::util::string(const size_t &size,
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const string_closure_size &closure)
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{
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const size_t alloc_size
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{
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size & ~SHRINK_TO_FIT
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};
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std::string ret(alloc_size, char{});
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const mutable_buffer buf
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{
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const_cast<char *>(ret.data()), ret.size()
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};
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const size_t consumed
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{
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closure(buf)
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};
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assert(consumed <= buffer::size(buf));
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data(buf)[consumed] = '\0';
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ret.resize(consumed);
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if(size & SHRINK_TO_FIT)
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ret.shrink_to_fit();
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return ret;
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}
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std::string
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ircd::util::string(const const_buffer &buf)
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{
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return string(data(buf), size(buf));
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}
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std::string
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ircd::util::string(const char *const &buf,
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const size_t &size)
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{
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return std::string{buf, size};
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}
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std::string
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ircd::util::string(const uint8_t *const &buf,
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const size_t &size)
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{
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return string(reinterpret_cast<const char *>(buf), size);
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// util/timer.h
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//
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ircd::util::timer::timer(const std::function<void ()> &func)
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:timer{}
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{
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func();
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stop();
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}
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void
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ircd::util::timer::stop()
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{
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const auto now
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{
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!stopped()?
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clock::now():
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start
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};
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const auto elapsed
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{
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duration_cast<decltype(accumulator)>(now - start)
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};
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accumulator += elapsed;
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start = clock::time_point::min();
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}
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void
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ircd::util::timer::cont()
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{
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const auto now
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{
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clock::now()
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};
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const auto elapsed
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{
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!stopped()?
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duration_cast<decltype(accumulator)>(now - start):
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decltype(accumulator)(0)
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};
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accumulator += elapsed;
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start = now;
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}
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std::string
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ircd::util::timer::pretty(const int &fmt)
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const
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{
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return util::pretty(at<nanoseconds>(), fmt);
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}
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ircd::string_view
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ircd::util::timer::pretty(const mutable_buffer &out,
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const int &fmt)
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const
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{
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return util::pretty(out, at<nanoseconds>(), fmt);
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// util/u2a.h
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//
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std::string
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ircd::util::u2a(const const_buffer &in)
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{
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return string(size(in) * 2, [&in]
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(const mutable_buffer &out)
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{
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return u2a(out, in);
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});
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}
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ircd::string_view
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ircd::util::u2a(const mutable_buffer &out,
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const const_buffer &in)
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{
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char *p(data(out));
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for(size_t i(0); i < size(in) && p + 2 <= end(out); ++i)
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{
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char tmp[3];
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::snprintf(tmp, sizeof(tmp), "%02x", uint8_t(in[i]));
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*p++ = tmp[0];
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*p++ = tmp[1];
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}
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return { data(out), p };
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}
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ircd::const_buffer
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ircd::util::a2u(const mutable_buffer &out,
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const const_buffer &in)
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{
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const size_t len{size(in) / 2};
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for(size_t i(0); i < len; ++i)
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{
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const char gl[3]
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{
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in[i * 2],
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in[i * 2 + 1],
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'\0'
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};
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out[i] = strtol(gl, nullptr, 16);
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}
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return { data(out), len };
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// util/unwind.h
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//
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ircd::util::unwind_defer::~unwind_defer()
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noexcept
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{
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ircd::defer
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{
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std::move(func)
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};
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// util/what.h
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//
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/// Get what() from exception_ptr
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///
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ircd::string_view
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ircd::util::what(const std::exception_ptr eptr)
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noexcept try
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{
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if(likely(eptr))
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std::rethrow_exception(eptr);
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return {};
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}
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catch(const std::exception &e)
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{
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return e.what();
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}
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catch(...)
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{
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return {};
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}
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