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54 lines
1.2 KiB
Go
54 lines
1.2 KiB
Go
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// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package trace
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import "fmt"
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// Value is a dynamically-typed value obtained from a trace.
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type Value struct {
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kind ValueKind
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scalar uint64
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}
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// ValueKind is the type of a dynamically-typed value from a trace.
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type ValueKind uint8
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const (
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ValueBad ValueKind = iota
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ValueUint64
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)
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// Kind returns the ValueKind of the value.
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//
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// It represents the underlying structure of the value.
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//
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// New ValueKinds may be added in the future. Users of this type must be robust
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// to that possibility.
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func (v Value) Kind() ValueKind {
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return v.kind
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}
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// Uint64 returns the uint64 value for a MetricSampleUint64.
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//
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// Panics if this metric sample's Kind is not MetricSampleUint64.
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func (v Value) Uint64() uint64 {
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if v.kind != ValueUint64 {
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panic("Uint64 called on Value of a different Kind")
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}
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return v.scalar
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}
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// valueAsString produces a debug string value.
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//
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// This isn't just Value.String because we may want to use that to store
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// string values in the future.
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func valueAsString(v Value) string {
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switch v.Kind() {
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case ValueUint64:
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return fmt.Sprintf("Uint64(%d)", v.scalar)
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}
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return "Bad"
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}
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