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NpgsqlEventSource.cs
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using System;
using System.Threading;
using System.Diagnostics.Tracing;
using System.Runtime.CompilerServices;
namespace Npgsql
{
sealed class NpgsqlEventSource : EventSource
{
public static readonly NpgsqlEventSource Log = new NpgsqlEventSource();
const string EventSourceName = "Npgsql";
internal const int CommandStartId = 3;
internal const int CommandStopId = 4;
#if !NET461 && !NETSTANDARD2_0
IncrementingPollingCounter? _bytesWrittenPerSecondCounter;
IncrementingPollingCounter? _bytesReadPerSecondCounter;
IncrementingPollingCounter? _commandsPerSecondCounter;
PollingCounter? _totalCommandsCounter;
PollingCounter? _failedCommandsCounter;
PollingCounter? _currentCommandsCounter;
PollingCounter? _preparedCommandsRatioCounter;
PollingCounter? _poolsCounter;
PollingCounter? _idleConnectionsCounter;
PollingCounter? _busyConnectionsCounter;
#endif
long _bytesWritten;
long _bytesRead;
long _totalCommands;
long _totalPreparedCommands;
long _currentCommands;
long _failedCommands;
int _pools;
internal NpgsqlEventSource() : base(EventSourceName) {}
// NOTE
// - The 'Start' and 'Stop' suffixes on the following event names have special meaning in EventSource. They
// enable creating 'activities'.
// For more information, take a look at the following blog post:
// https://blogs.msdn.microsoft.com/vancem/2015/09/14/exploring-eventsource-activity-correlation-and-causation-features/
// - A stop event's event id must be next one after its start event.
internal void BytesWritten(long bytesWritten) => Interlocked.Add(ref _bytesWritten, bytesWritten);
internal void BytesRead(long bytesRead) => Interlocked.Add(ref _bytesRead, bytesRead);
[Event(CommandStartId, Level = EventLevel.Informational)]
public void CommandStart(string sql)
{
Interlocked.Increment(ref _totalCommands);
Interlocked.Increment(ref _currentCommands);
WriteEvent(CommandStartId, sql);
}
[MethodImpl(MethodImplOptions.NoInlining)]
[Event(CommandStopId, Level = EventLevel.Informational)]
public void CommandStop()
{
Interlocked.Decrement(ref _currentCommands);
WriteEvent(CommandStopId);
}
internal void CommandStartPrepared() => Interlocked.Increment(ref _totalPreparedCommands);
internal void CommandFailed() => Interlocked.Increment(ref _failedCommands);
internal void PoolCreated() => Interlocked.Increment(ref _pools);
#if !NET461 && !NETSTANDARD2_0
static int GetIdleConnections()
{
// Note: there's no attempt here to be coherent in terms of race conditions, especially not with regards
// to different counters. So idle and busy and be unsynchronized, as they're not polled together.
var sum = 0;
foreach (var kv in PoolManager.Pools)
{
var pool = kv.Pool;
if (pool == null)
return sum;
sum += pool.State.Idle;
}
return sum;
}
static int GetBusyConnections()
{
// Note: there's no attempt here to be coherent in terms of race conditions, especially not with regards
// to different counters. So idle and busy and be unsynchronized, as they're not polled together.
var sum = 0;
foreach (var kv in PoolManager.Pools)
{
var pool = kv.Pool;
if (pool == null)
return sum;
var (_, _, busy) = pool.State;
sum += busy;
}
return sum;
}
protected override void OnEventCommand(EventCommandEventArgs command)
{
if (command.Command == EventCommand.Enable)
{
// Comment taken from RuntimeEventSource in CoreCLR
// NOTE: These counters will NOT be disposed on disable command because we may be introducing
// a race condition by doing that. We still want to create these lazily so that we aren't adding
// overhead by at all times even when counters aren't enabled.
// On disable, PollingCounters will stop polling for values so it should be fine to leave them around.
_bytesWrittenPerSecondCounter = new IncrementingPollingCounter("bytes-written-per-second", this, () => _bytesWritten)
{
DisplayName = "Bytes Written",
DisplayRateTimeScale = TimeSpan.FromSeconds(1)
};
_bytesReadPerSecondCounter = new IncrementingPollingCounter("bytes-read-per-second", this, () => _bytesRead)
{
DisplayName = "Bytes Read",
DisplayRateTimeScale = TimeSpan.FromSeconds(1)
};
_commandsPerSecondCounter = new IncrementingPollingCounter("commands-per-second", this, () => _totalCommands)
{
DisplayName = "Command Rate",
DisplayRateTimeScale = TimeSpan.FromSeconds(1)
};
_totalCommandsCounter = new PollingCounter("total-commands", this, () => _totalCommands)
{
DisplayName = "Total Commands",
};
_currentCommandsCounter = new PollingCounter("current-commands", this, () => _currentCommands)
{
DisplayName = "Current Commands"
};
_failedCommandsCounter = new PollingCounter("failed-commands", this, () => _failedCommands)
{
DisplayName = "Failed Commands"
};
// _preparedCommandsRatioCounter = new PollingCounter("prepared-commands-ratio", this, () => (double)_totalPreparedCommands / (double)_totalCommands)
_preparedCommandsRatioCounter = new PollingCounter("prepared-commands-ratio", this, () =>
{
Console.WriteLine($"{(double)_totalPreparedCommands} / {(double)_totalCommands}");
return (double)_totalPreparedCommands / (double)_totalCommands;
})
{
DisplayName = "Prepared Commands Ratio",
DisplayUnits = "%"
};
_poolsCounter = new PollingCounter("connection-pools", this, () => _pools)
{
DisplayName = "Connection Pools"
};
_idleConnectionsCounter = new PollingCounter("idle-connections", this, () => GetIdleConnections())
{
DisplayName = "Idle Connections"
};
_busyConnectionsCounter = new PollingCounter("busy-connections", this, () => GetBusyConnections())
{
DisplayName = "Busy Connections"
};
}
}
#endif
}
}