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#region Copyright notice and license
// Copyright 2015, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion
using System;
using System.Runtime.InteropServices;
using System.Threading;
using Grpc.Core.Utils;
namespace Grpc.Core.Internal
{
/// <summary>
/// gpr_timespec from grpc/support/time.h
/// </summary>
[StructLayout(LayoutKind.Sequential)]
internal struct Timespec
{
const long NanosPerSecond = 1000 * 1000 * 1000;
const long NanosPerTick = 100;
const long TicksPerSecond = NanosPerSecond / NanosPerTick;
static readonly DateTime UnixEpoch = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
[DllImport("grpc_csharp_ext.dll")]
static extern Timespec gprsharp_now(GPRClockType clockType);
[DllImport("grpc_csharp_ext.dll")]
static extern Timespec gprsharp_inf_future(GPRClockType clockType);
[DllImport("grpc_csharp_ext.dll")]
static extern Timespec gprsharp_inf_past(GPRClockType clockType);
[DllImport("grpc_csharp_ext.dll")]
static extern int gprsharp_sizeof_timespec();
public Timespec(IntPtr tv_sec, int tv_nsec) : this(tv_sec, tv_nsec, GPRClockType.Realtime)
{
}
public Timespec(IntPtr tv_sec, int tv_nsec, GPRClockType clock_type)
{
this.tv_sec = tv_sec;
this.tv_nsec = tv_nsec;
this.clock_type = clock_type;
}
// NOTE: on linux 64bit sizeof(gpr_timespec) = 16, on windows 32bit sizeof(gpr_timespec) = 8
// so IntPtr seems to have the right size to work on both.
private System.IntPtr tv_sec;
private int tv_nsec;
private GPRClockType clock_type;
/// <summary>
/// Timespec a long time in the future.
/// </summary>
public static Timespec InfFuture
{
get
{
return gprsharp_inf_future(GPRClockType.Realtime);
}
}
/// <summary>
/// Timespec a long time in the past.
/// </summary>
public static Timespec InfPast
{
get
{
return gprsharp_inf_past(GPRClockType.Realtime);
}
}
/// <summary>
/// Return Timespec representing the current time.
/// </summary>
public static Timespec Now
{
get
{
return gprsharp_now(GPRClockType.Realtime);
}
}
/// <summary>
/// Seconds since unix epoch.
/// </summary>
public IntPtr TimevalSeconds
{
get
{
return tv_sec;
}
}
/// <summary>
/// The nanoseconds part of timeval.
/// </summary>
public int TimevalNanos
{
get
{
return tv_nsec;
}
}
/// <summary>
/// Converts Timespec to DateTime.
/// Timespec needs to be of type GPRClockType.Realtime and needs to represent a legal value.
/// DateTime has lower resolution (100ns), so rounding can occurs.
/// Value are always rounded up to the nearest DateTime value in the future.
///
/// For Timespec.InfFuture or if timespec is after the largest representable DateTime, DateTime.MaxValue is returned.
/// For Timespec.InfPast or if timespec is before the lowest representable DateTime, DateTime.MinValue is returned.
///
/// Unless DateTime.MaxValue or DateTime.MinValue is returned, the resulting DateTime is always in UTC
/// (DateTimeKind.Utc)
/// </summary>
public DateTime ToDateTime()
{
Preconditions.CheckState(tv_nsec >= 0 && tv_nsec < NanosPerSecond);
Preconditions.CheckState(clock_type == GPRClockType.Realtime);
// fast path for InfFuture
if (this.Equals(InfFuture))
{
return DateTime.MaxValue;
}
// fast path for InfPast
if (this.Equals(InfPast))
{
return DateTime.MinValue;
}
try
{
// convert nanos to ticks, round up to the nearest tick
long ticksFromNanos = tv_nsec / NanosPerTick + ((tv_nsec % NanosPerTick != 0) ? 1 : 0);
long ticksTotal = checked(tv_sec.ToInt64() * TicksPerSecond + ticksFromNanos);
return UnixEpoch.AddTicks(ticksTotal);
}
catch (OverflowException)
{
// ticks out of long range
return tv_sec.ToInt64() > 0 ? DateTime.MaxValue : DateTime.MinValue;
}
catch (ArgumentOutOfRangeException)
{
// resulting date time would be larger than MaxValue
return tv_sec.ToInt64() > 0 ? DateTime.MaxValue : DateTime.MinValue;
}
}
internal static int NativeSize
{
get
{
return gprsharp_sizeof_timespec();
}
}
}
}
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