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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| // <copyright file="ActivitySamplingParameters.cs" company="OpenTelemetry Authors"> | ||
| // Copyright The OpenTelemetry Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // </copyright> | ||
| using System.Collections.Generic; | ||
| using System.Diagnostics; | ||
|
|
||
| namespace OpenTelemetry.Trace | ||
| { | ||
| /// <summary> | ||
| /// Sampling parameters passed to an <see cref="ActivitySampler"/> for it to make a sampling decision. | ||
| /// </summary> | ||
| public readonly struct ActivitySamplingParameters | ||
| { | ||
| /// <summary> | ||
| /// Initializes a new instance of the <see cref="ActivitySamplingParameters"/> struct. | ||
| /// </summary> | ||
| /// <param name="parentContext">Parent activity context. Typically taken from the wire.</param> | ||
| /// <param name="traceId">Trace ID of a activity to be created.</param> | ||
| /// <param name="name">The name (DisplayName) of the activity to be created. Note, that the name of the activity is settable. | ||
| /// So this name can be changed later and Sampler implementation should assume that. | ||
| /// Typical example of a name change is when <see cref="Activity"/> representing incoming http request | ||
| /// has a name of url path and then being updated with route name when routing complete. | ||
| /// </param> | ||
| /// <param name="kind">The kind of the Activity to be created.</param> | ||
| /// <param name="tags">Initial set of Tags for the Activity being constructed.</param> | ||
| /// <param name="links">Links associated with the activity.</param> | ||
| public ActivitySamplingParameters( | ||
| ActivityContext parentContext, | ||
| ActivityTraceId traceId, | ||
| string name, | ||
| ActivityKind kind, | ||
| IEnumerable<KeyValuePair<string, string>> tags = null, // TODO: Empty | ||
| IEnumerable<ActivityLink> links = null) | ||
| { | ||
| this.ParentContext = parentContext; | ||
| this.TraceId = traceId; | ||
| this.Name = name; | ||
| this.Kind = kind; | ||
| this.Tags = tags; | ||
| this.Links = links; | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Gets the parent activity context. | ||
| /// </summary> | ||
| public ActivityContext ParentContext { get; } | ||
|
|
||
| /// <summary> | ||
| /// Gets the trace ID of parent activity or a new generated one for root span/activity. | ||
| /// </summary> | ||
| public ActivityTraceId TraceId { get; } | ||
|
|
||
| /// <summary> | ||
| /// Gets the name to be given to the span/activity. | ||
| /// </summary> | ||
| public string Name { get; } | ||
|
|
||
| /// <summary> | ||
| /// Gets the kind of span/activity to be created. | ||
| /// </summary> | ||
| public ActivityKind Kind { get; } | ||
|
|
||
| /// <summary> | ||
| /// Gets the tags to be associated to the span/activity to be created. | ||
| /// </summary> | ||
| public IEnumerable<KeyValuePair<string, string>> Tags { get; } | ||
|
|
||
| /// <summary> | ||
| /// Gets the links to be added to the activity to be created. | ||
| /// </summary> | ||
| public IEnumerable<ActivityLink> Links { get; } | ||
| } | ||
| } |
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118 changes: 118 additions & 0 deletions
118
src/OpenTelemetry/Trace/Samplers/ProbabilityActivitySampler.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| // <copyright file="ProbabilityActivitySampler.cs" company="OpenTelemetry Authors"> | ||
| // Copyright The OpenTelemetry Authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // </copyright> | ||
| using System; | ||
| using System.Diagnostics; | ||
| using System.Globalization; | ||
|
|
||
| namespace OpenTelemetry.Trace.Samplers | ||
| { | ||
| /// <summary> | ||
| /// Sampler implementation which will take a sample if parent Activity or any linked Activity is sampled. | ||
| /// Otherwise, samples traces according to the specified probability. | ||
| /// </summary> | ||
| public sealed class ProbabilityActivitySampler : ActivitySampler | ||
| { | ||
| private readonly long idUpperBound; | ||
| private readonly double probability; | ||
|
|
||
| /// <summary> | ||
| /// Initializes a new instance of the <see cref="ProbabilityActivitySampler"/> class. | ||
| /// </summary> | ||
| /// <param name="probability">The desired probability of sampling. This must be between 0.0 and 1.0. | ||
| /// Higher the value, higher is the probability of a given Activity to be sampled in. | ||
| /// </param> | ||
| public ProbabilityActivitySampler(double probability) | ||
| { | ||
| if (probability < 0.0 || probability > 1.0) | ||
| { | ||
| throw new ArgumentOutOfRangeException(nameof(probability), "Probability must be in range [0.0, 1.0]"); | ||
| } | ||
|
|
||
| this.probability = probability; | ||
|
|
||
| // The expected description is like ProbabilityActivitySampler{0.000100} | ||
| this.Description = "ProbabilityActivitySampler{" + this.probability.ToString("F6", CultureInfo.InvariantCulture) + "}"; | ||
|
|
||
| // Special case the limits, to avoid any possible issues with lack of precision across | ||
| // double/long boundaries. For probability == 0.0, we use Long.MIN_VALUE as this guarantees | ||
| // that we will never sample a trace, even in the case where the id == Long.MIN_VALUE, since | ||
| // Math.Abs(Long.MIN_VALUE) == Long.MIN_VALUE. | ||
| if (this.probability == 0.0) | ||
| { | ||
| this.idUpperBound = long.MinValue; | ||
| } | ||
| else if (this.probability == 1.0) | ||
| { | ||
| this.idUpperBound = long.MaxValue; | ||
| } | ||
| else | ||
| { | ||
| this.idUpperBound = (long)(probability * long.MaxValue); | ||
| } | ||
| } | ||
|
|
||
| /// <inheritdoc /> | ||
| public override string Description { get; } | ||
|
|
||
| /// <inheritdoc /> | ||
| public override SamplingResult ShouldSample(in ActivitySamplingParameters samplingParameters) | ||
| { | ||
| // If the parent is sampled keep the sampling decision. | ||
| var parentContext = samplingParameters.ParentContext; | ||
| if ((parentContext.TraceFlags & ActivityTraceFlags.Recorded) != 0) | ||
| { | ||
| return new SamplingResult(true); | ||
| } | ||
|
|
||
| if (samplingParameters.Links != null) | ||
| { | ||
| // If any parent link is sampled keep the sampling decision. | ||
| foreach (var parentLink in samplingParameters.Links) | ||
| { | ||
| if ((parentLink.Context.TraceFlags & ActivityTraceFlags.Recorded) != 0) | ||
| { | ||
| return new SamplingResult(true); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // Always sample if we are within probability range. This is true even for child activities (that | ||
| // may have had a different sampling decision made) to allow for different sampling policies, | ||
| // and dynamic increases to sampling probabilities for debugging purposes. | ||
| // Note use of '<' for comparison. This ensures that we never sample for probability == 0.0, | ||
| // while allowing for a (very) small chance of *not* sampling if the id == Long.MAX_VALUE. | ||
| // This is considered a reasonable trade-off for the simplicity/performance requirements (this | ||
| // code is executed in-line for every Activity creation). | ||
| Span<byte> traceIdBytes = stackalloc byte[16]; | ||
| samplingParameters.TraceId.CopyTo(traceIdBytes); | ||
| return Math.Abs(this.GetLowerLong(traceIdBytes)) < this.idUpperBound ? new SamplingResult(true) : new SamplingResult(false); | ||
| } | ||
|
|
||
| private long GetLowerLong(ReadOnlySpan<byte> bytes) | ||
| { | ||
| long result = 0; | ||
| for (var i = 0; i < 8; i++) | ||
| { | ||
| result <<= 8; | ||
| #pragma warning disable CS0675 // Bitwise-or operator used on a sign-extended operand | ||
| result |= bytes[i] & 0xff; | ||
| #pragma warning restore CS0675 // Bitwise-or operator used on a sign-extended operand | ||
| } | ||
|
|
||
| return result; | ||
| } | ||
| } | ||
| } |
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