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TagTransformer.cs
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TagTransformer.cs
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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#nullable enable
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
namespace OpenTelemetry.Internal;
internal abstract class TagTransformer<T>
where T : notnull
{
protected TagTransformer()
{
}
public bool TryTransformTag(
KeyValuePair<string, object> tag,
[NotNullWhen(true)] out T? result,
int? tagValueMaxLength = null)
{
if (tag.Value == null)
{
result = default;
return false;
}
switch (tag.Value)
{
case char:
case string:
result = this.TransformStringTag(tag.Key, TruncateString(Convert.ToString(tag.Value)!, tagValueMaxLength));
break;
case bool b:
result = this.TransformBooleanTag(tag.Key, b);
break;
case byte:
case sbyte:
case short:
case ushort:
case int:
case uint:
case long:
result = this.TransformIntegralTag(tag.Key, Convert.ToInt64(tag.Value));
break;
case float:
case double:
result = this.TransformFloatingPointTag(tag.Key, Convert.ToDouble(tag.Value));
break;
case Array array:
try
{
result = this.TransformArrayTagInternal(tag.Key, array, tagValueMaxLength);
}
catch
{
// If an exception is thrown when calling ToString
// on any element of the array, then the entire array value
// is ignored.
return this.LogUnsupportedTagTypeAndReturnDefault(tag.Key, tag.Value, out result);
}
break;
// All other types are converted to strings including the following
// built-in value types:
// case nint: Pointer type.
// case nuint: Pointer type.
// case ulong: May throw an exception on overflow.
// case decimal: Converting to double produces rounding errors.
default:
try
{
var stringValue = TruncateString(Convert.ToString(tag.Value), tagValueMaxLength);
if (stringValue == null)
{
return this.LogUnsupportedTagTypeAndReturnDefault(tag.Key, tag.Value, out result);
}
result = this.TransformStringTag(tag.Key, stringValue);
}
catch
{
// If ToString throws an exception then the tag is ignored.
return this.LogUnsupportedTagTypeAndReturnDefault(tag.Key, tag.Value, out result);
}
break;
}
return true;
}
protected abstract T TransformIntegralTag(string key, long value);
protected abstract T TransformFloatingPointTag(string key, double value);
protected abstract T TransformBooleanTag(string key, bool value);
protected abstract T TransformStringTag(string key, string value);
protected abstract T TransformArrayTag(string key, Array array);
protected abstract void OnUnsupportedTagDropped(
string tagKey,
string tagValueTypeFullName);
[return: NotNullIfNotNull(nameof(value))]
private static string? TruncateString(string? value, int? maxLength)
{
return maxLength.HasValue && value?.Length > maxLength
? value.Substring(0, maxLength.Value)
: value;
}
private T TransformArrayTagInternal(string key, Array array, int? tagValueMaxLength)
{
// This switch ensures the values of the resultant array-valued tag are of the same type.
return array switch
{
char[] => this.TransformArrayTag(key, array),
string[] => this.ConvertToStringArrayThenTransformArrayTag(key, array, tagValueMaxLength),
bool[] => this.TransformArrayTag(key, array),
byte[] => this.TransformArrayTag(key, array),
sbyte[] => this.TransformArrayTag(key, array),
short[] => this.TransformArrayTag(key, array),
ushort[] => this.TransformArrayTag(key, array),
#if NETFRAMEWORK
int[] => this.TransformArrayTagIntNetFramework(key, array, tagValueMaxLength),
#else
int[] => this.TransformArrayTag(key, array),
#endif
uint[] => this.TransformArrayTag(key, array),
#if NETFRAMEWORK
long[] => this.TransformArrayTagLongNetFramework(key, array, tagValueMaxLength),
#else
long[] => this.TransformArrayTag(key, array),
#endif
float[] => this.TransformArrayTag(key, array),
double[] => this.TransformArrayTag(key, array),
_ => this.ConvertToStringArrayThenTransformArrayTag(key, array, tagValueMaxLength),
};
}
#if NETFRAMEWORK
private T TransformArrayTagIntNetFramework(string key, Array array, int? tagValueMaxLength)
{
// Note: On .NET Framework x86 nint[] & nuint[] fall into int[] case
var arrayType = array.GetType();
if (arrayType == typeof(nint[])
|| arrayType == typeof(nuint[]))
{
return this.ConvertToStringArrayThenTransformArrayTag(key, array, tagValueMaxLength);
}
return this.TransformArrayTag(key, array);
}
private T TransformArrayTagLongNetFramework(string key, Array array, int? tagValueMaxLength)
{
// Note: On .NET Framework x64 nint[] & nuint[] fall into long[] case
var arrayType = array.GetType();
if (arrayType == typeof(nint[])
|| arrayType == typeof(nuint[]))
{
return this.ConvertToStringArrayThenTransformArrayTag(key, array, tagValueMaxLength);
}
return this.TransformArrayTag(key, array);
}
#endif
private T ConvertToStringArrayThenTransformArrayTag(string key, Array array, int? tagValueMaxLength)
{
string?[] stringArray;
if (array is string?[] arrayAsStringArray
&& (!tagValueMaxLength.HasValue || !arrayAsStringArray.Any(s => s?.Length > tagValueMaxLength)))
{
stringArray = arrayAsStringArray;
}
else
{
stringArray = new string?[array.Length];
for (var i = 0; i < array.Length; ++i)
{
var item = array.GetValue(i);
stringArray[i] = item == null
? null
: TruncateString(Convert.ToString(item), tagValueMaxLength);
}
}
return this.TransformArrayTag(key, stringArray);
}
private bool LogUnsupportedTagTypeAndReturnDefault(string key, object value, out T? result)
{
Debug.Assert(value != null, "value was null");
this.OnUnsupportedTagDropped(key, value!.GetType().ToString());
result = default;
return false;
}
}