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https://github.com/open-telemetry/opentelemetry-go.git
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5bfa9c55be
Fix #5343 - Update the `evictionQueue` to log when it drops a value - Update the `evictionQueue` to be declared over an `[T any]` parameter so it knows what to log when it is dropping a value and to reduce the `interface{}` allocation - Add a `clone` method to replace the now unneeded `interfaceArrayTo*Array` functions. - Update the `recordingSpan` to log once that is dropped an attribute when limits are reached.
55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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package trace // import "go.opentelemetry.io/otel/sdk/trace"
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import (
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"fmt"
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"slices"
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"sync"
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"go.opentelemetry.io/otel/internal/global"
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)
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// evictedQueue is a FIFO queue with a configurable capacity.
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type evictedQueue[T any] struct {
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queue []T
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capacity int
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droppedCount int
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logDropped func()
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}
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func newEvictedQueue[T any](capacity int) evictedQueue[T] {
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var tVal T
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msg := fmt.Sprintf("limit reached: dropping trace %T", tVal)
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// Do not pre-allocate queue, do this lazily.
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return evictedQueue[T]{
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capacity: capacity,
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logDropped: sync.OnceFunc(func() { global.Warn(msg) }),
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}
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}
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// add adds value to the evictedQueue eq. If eq is at capacity, the oldest
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// queued value will be discarded and the drop count incremented.
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func (eq *evictedQueue[T]) add(value T) {
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if eq.capacity == 0 {
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eq.droppedCount++
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eq.logDropped()
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return
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}
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if eq.capacity > 0 && len(eq.queue) == eq.capacity {
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// Drop first-in while avoiding allocating more capacity to eq.queue.
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copy(eq.queue[:eq.capacity-1], eq.queue[1:])
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eq.queue = eq.queue[:eq.capacity-1]
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eq.droppedCount++
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eq.logDropped()
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}
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eq.queue = append(eq.queue, value)
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}
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// copy returns a copy of the evictedQueue.
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func (eq *evictedQueue[T]) copy() []T {
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return slices.Clone(eq.queue)
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}
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