diff options
Diffstat (limited to 'src/csharp/Grpc.Core/Internal/Timespec.cs')
| -rw-r--r-- | src/csharp/Grpc.Core/Internal/Timespec.cs | 187 |
1 files changed, 162 insertions, 25 deletions
diff --git a/src/csharp/Grpc.Core/Internal/Timespec.cs b/src/csharp/Grpc.Core/Internal/Timespec.cs index de783f5a4b..e83d21f4a4 100644 --- a/src/csharp/Grpc.Core/Internal/Timespec.cs +++ b/src/csharp/Grpc.Core/Internal/Timespec.cs @@ -32,6 +32,8 @@ using System; using System.Runtime.InteropServices; using System.Threading; +using Grpc.Core.Utils; + namespace Grpc.Core.Internal { /// <summary> @@ -40,23 +42,43 @@ namespace Grpc.Core.Internal [StructLayout(LayoutKind.Sequential)] internal struct Timespec { - const int NanosPerSecond = 1000 * 1000 * 1000; - const int NanosPerTick = 100; + 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(); + static extern Timespec gprsharp_now(GPRClockType clockType); [DllImport("grpc_csharp_ext.dll")] - static extern Timespec gprsharp_inf_future(); + 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 Timespec gprsharp_convert_clock_type(Timespec t, GPRClockType targetClock); [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. - public System.IntPtr tv_sec; - public int tv_nsec; - public GPRClockType clock_type; + private System.IntPtr tv_sec; + private int tv_nsec; + private GPRClockType clock_type; /// <summary> /// Timespec a long time in the future. @@ -65,49 +87,164 @@ namespace Grpc.Core.Internal { get { - return gprsharp_inf_future(); + 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(); + return gprsharp_now(GPRClockType.Realtime); } } - internal static int NativeSize + /// <summary> + /// Seconds since unix epoch. + /// </summary> + public IntPtr TimevalSeconds { get { - return gprsharp_sizeof_timespec(); + return tv_sec; + } + } + + /// <summary> + /// The nanoseconds part of timeval. + /// </summary> + public int TimevalNanos + { + get + { + return tv_nsec; } } /// <summary> - /// Creates a GPR deadline from current instant and given timeout. + /// Converts the timespec to desired clock type. + /// </summary> + public Timespec ToClockType(GPRClockType targetClock) + { + return gprsharp_convert_clock_type(this, targetClock); + } + + /// <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; + } + } + + /// <summary> + /// Creates DateTime to Timespec. + /// DateTime has to be in UTC (DateTimeKind.Utc) unless it's DateTime.MaxValue or DateTime.MinValue. + /// For DateTime.MaxValue of date time after the largest representable Timespec, Timespec.InfFuture is returned. + /// For DateTime.MinValue of date time before the lowest representable Timespec, Timespec.InfPast is returned. /// </summary> - /// <returns>The from timeout.</returns> - public static Timespec DeadlineFromTimeout(TimeSpan timeout) + /// <returns>The date time.</returns> + /// <param name="dateTime">Date time.</param> + public static Timespec FromDateTime(DateTime dateTime) { - if (timeout == Timeout.InfiniteTimeSpan) + if (dateTime == DateTime.MaxValue) { return Timespec.InfFuture; } - return Timespec.Now.Add(timeout); + + if (dateTime == DateTime.MinValue) + { + return Timespec.InfPast; + } + + Preconditions.CheckArgument(dateTime.Kind == DateTimeKind.Utc, "dateTime"); + + try + { + TimeSpan timeSpan = dateTime - UnixEpoch; + long ticks = timeSpan.Ticks; + + long seconds = ticks / TicksPerSecond; + int nanos = (int)((ticks % TicksPerSecond) * NanosPerTick); + if (nanos < 0) + { + // correct the result based on C# modulo semantics for negative dividend + seconds--; + nanos += (int)NanosPerSecond; + } + // new IntPtr possibly throws OverflowException + return new Timespec(new IntPtr(seconds), nanos); + } + catch (OverflowException) + { + return dateTime > UnixEpoch ? Timespec.InfFuture : Timespec.InfPast; + } + catch (ArgumentOutOfRangeException) + { + return dateTime > UnixEpoch ? Timespec.InfFuture : Timespec.InfPast; + } } - public Timespec Add(TimeSpan timeSpan) + internal static int NativeSize { - long nanos = (long)tv_nsec + (timeSpan.Ticks % TimeSpan.TicksPerSecond) * NanosPerTick; - long overflow_sec = (nanos > NanosPerSecond) ? 1 : 0; - - Timespec result; - result.tv_nsec = (int)(nanos % NanosPerSecond); - result.tv_sec = new IntPtr(tv_sec.ToInt64() + (timeSpan.Ticks / TimeSpan.TicksPerSecond) + overflow_sec); - result.clock_type = GPRClockType.Realtime; - return result; + get + { + return gprsharp_sizeof_timespec(); + } } } } |