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Copy pathNpgsqlEventSource.cs
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243 lines (200 loc) · 8.9 KB
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using System;
using System.Collections.Concurrent;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Threading;
using System.Diagnostics.Tracing;
using System.Runtime.CompilerServices;
namespace Npgsql;
sealed class NpgsqlEventSource : EventSource
{
public static readonly NpgsqlEventSource Log = new();
// A static to keep the CWT values from making themselves uncollectable if they would have a reference through the
// NpgsqlEventSource instance to the CWT table, which they would if this was an instance field.
static readonly NpgsqlEventSourceDataSources DataSourceEvents = new(Log);
const string EventSourceName = "Npgsql";
internal const int CommandStartId = 3;
internal const int CommandStopId = 4;
IncrementingPollingCounter? _bytesWrittenPerSecondCounter;
IncrementingPollingCounter? _bytesReadPerSecondCounter;
IncrementingPollingCounter? _commandsPerSecondCounter;
PollingCounter? _totalCommandsCounter;
PollingCounter? _failedCommandsCounter;
PollingCounter? _currentCommandsCounter;
PollingCounter? _preparedCommandsRatioCounter;
PollingCounter? _poolsCounter;
long _bytesWritten;
long _bytesRead;
long _totalCommands;
long _totalPreparedCommands;
long _currentCommands;
long _failedCommands;
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)
{
if (IsEnabled())
Interlocked.Add(ref _bytesWritten, bytesWritten);
}
internal void BytesRead(long bytesRead)
{
if (IsEnabled())
Interlocked.Add(ref _bytesRead, bytesRead);
}
internal void CommandStart(string sql)
{
if (IsEnabled())
{
Interlocked.Increment(ref _totalCommands);
Interlocked.Increment(ref _currentCommands);
}
NpgsqlSqlEventSource.Log.CommandStart(sql);
}
internal void CommandStop()
{
if (IsEnabled())
Interlocked.Decrement(ref _currentCommands);
NpgsqlSqlEventSource.Log.CommandStop();
}
internal void CommandStartPrepared()
{
if (IsEnabled())
Interlocked.Increment(ref _totalPreparedCommands);
}
internal void CommandFailed()
{
if (IsEnabled())
Interlocked.Increment(ref _failedCommands);
}
internal bool TryTrackDataSource(string name, NpgsqlDataSource dataSource, [NotNullWhen(true)]out IDisposable? untrack)
=> DataSourceEvents.TryTrack(name, dataSource, out untrack);
double GetDataSourceCount() => DataSourceEvents.GetDataSourceCount();
protected override void OnEventCommand(EventCommandEventArgs command)
{
if (command.Command is 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, () => Interlocked.Read(ref _bytesWritten))
{
DisplayName = "Bytes Written",
DisplayRateTimeScale = TimeSpan.FromSeconds(1)
};
_bytesReadPerSecondCounter = new IncrementingPollingCounter("bytes-read-per-second", this, () => Interlocked.Read(ref _bytesRead))
{
DisplayName = "Bytes Read",
DisplayRateTimeScale = TimeSpan.FromSeconds(1)
};
_commandsPerSecondCounter = new IncrementingPollingCounter("commands-per-second", this, () => Interlocked.Read(ref _totalCommands))
{
DisplayName = "Command Rate",
DisplayRateTimeScale = TimeSpan.FromSeconds(1)
};
_totalCommandsCounter = new PollingCounter("total-commands", this, () => Interlocked.Read(ref _totalCommands))
{
DisplayName = "Total Commands",
};
_currentCommandsCounter = new PollingCounter("current-commands", this, () => Interlocked.Read(ref _currentCommands))
{
DisplayName = "Current Commands"
};
_failedCommandsCounter = new PollingCounter("failed-commands", this, () => Interlocked.Read(ref _failedCommands))
{
DisplayName = "Failed Commands"
};
_preparedCommandsRatioCounter = new PollingCounter(
"prepared-commands-ratio",
this,
() => (double)Interlocked.Read(ref _totalPreparedCommands) / Interlocked.Read(ref _totalCommands) * 100)
{
DisplayName = "Prepared Commands Ratio",
DisplayUnits = "%"
};
_poolsCounter = new PollingCounter("connection-pools", this, GetDataSourceCount)
{
DisplayName = "Connection Pools"
};
DataSourceEvents.EnableAll();
}
}
}
// This is a separate class to avoid accidentally making the CWT instance reachable through the value.
// The EventSource is stored in the counters, part of the value, so the EventSource *must not* reference this instance on an instance field.
// This goes for any state captured by the value, which is why the other state has its own object for the value to reference.
// See https://github.com/dotnet/runtime/issues/12255.
sealed class NpgsqlEventSourceDataSources(EventSource eventSource)
{
readonly ConditionalWeakTable<NpgsqlDataSource, Lazy<DataSourceEvents>> _dataSources = new();
readonly StrongBox<(int DataSourceCount, ConcurrentDictionary<string, bool> DataSourceNames)> _nonCwtState = new((0, new()));
internal double GetDataSourceCount() => _nonCwtState.Value.DataSourceCount;
internal bool TryTrack(string name, NpgsqlDataSource dataSource, [NotNullWhen(true)]out IDisposable? untrack)
{
untrack = null;
if (!_nonCwtState.Value.DataSourceNames.TryAdd(name, default))
return false;
var lazy = new Lazy<DataSourceEvents>(
() => new DataSourceEvents(name: name, dataSource, eventSource, _nonCwtState),
LazyThreadSafetyMode.ExecutionAndPublication);
var tracked = _dataSources.TryAdd(dataSource, lazy);
if (tracked)
{
Interlocked.Increment(ref _nonCwtState.Value.DataSourceCount);
// We must initialize directly when the event source is already enabled.
if (eventSource.IsEnabled())
untrack = lazy.Value;
else
untrack = new DataSourceEventsDisposable(lazy);
}
return tracked;
}
internal void EnableAll()
{
foreach (var dataSourceKv in _dataSources)
{
_ = dataSourceKv.Value.Value;
}
}
sealed class DataSourceEventsDisposable(Lazy<DataSourceEvents> events) : IDisposable
{
public void Dispose() => events.Value.Dispose();
}
sealed class DataSourceEvents : IDisposable
{
readonly string _name;
readonly StrongBox<(int Count, ConcurrentDictionary<string, bool> Names)> _state;
readonly PollingCounter _idleConnections;
readonly PollingCounter _busyConnections;
int _disposed;
public DataSourceEvents(string name, NpgsqlDataSource dataSource, EventSource eventSource, StrongBox<(int, ConcurrentDictionary<string, bool>)> state)
{
_name = name;
_state = state;
_idleConnections = new($"idle-connections-{name}", eventSource, () => dataSource.Statistics.Idle)
{
DisplayName = $"Idle Connections [{name}]"
};
_busyConnections = new($"busy-connections-{name}", eventSource, () => dataSource.Statistics.Busy)
{
DisplayName = $"Busy Connections [{name}]"
};
}
public void Dispose()
{
if (Interlocked.Exchange(ref _disposed, 1) is 1)
return;
_idleConnections.Dispose();
_busyConnections.Dispose();
Interlocked.Decrement(ref _state.Value.Count);
var success = _state.Value.Names.TryRemove(_name, out _);
Debug.Assert(success);
}
}
}
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