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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package sdk
import (
"log/slog"
"os"
"strconv"
)
// maxSpan are the span limits resolved during startup.
var maxSpan = newSpanLimits()
type spanLimits struct {
// Attrs is the number of allowed attributes for a span.
//
// This is resolved from the environment variable value for the
// OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT key if it exists. Otherwise, the
// environment variable value for OTEL_ATTRIBUTE_COUNT_LIMIT, or 128 if
// that is not set, is used.
Attrs int
// AttrValueLen is the maximum attribute value length allowed for a span.
//
// This is resolved from the environment variable value for the
// OTEL_SPAN_ATTRIBUTE_VALUE_LENGTH_LIMIT key if it exists. Otherwise, the
// environment variable value for OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT, or -1
// if that is not set, is used.
AttrValueLen int
// Events is the number of allowed events for a span.
//
// This is resolved from the environment variable value for the
// OTEL_SPAN_EVENT_COUNT_LIMIT key, or 128 is used if that is not set.
Events int
// EventAttrs is the number of allowed attributes for a span event.
//
// The is resolved from the environment variable value for the
// OTEL_EVENT_ATTRIBUTE_COUNT_LIMIT key, or 128 is used if that is not set.
EventAttrs int
// Links is the number of allowed Links for a span.
//
// This is resolved from the environment variable value for the
// OTEL_SPAN_LINK_COUNT_LIMIT, or 128 is used if that is not set.
Links int
// LinkAttrs is the number of allowed attributes for a span link.
//
// This is resolved from the environment variable value for the
// OTEL_LINK_ATTRIBUTE_COUNT_LIMIT, or 128 is used if that is not set.
LinkAttrs int
}
func newSpanLimits() spanLimits {
return spanLimits{
Attrs: firstEnv(
128,
"OTEL_SPAN_ATTRIBUTE_COUNT_LIMIT",
"OTEL_ATTRIBUTE_COUNT_LIMIT",
),
AttrValueLen: firstEnv(
-1, // Unlimited.
"OTEL_SPAN_ATTRIBUTE_VALUE_LENGTH_LIMIT",
"OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT",
),
Events: firstEnv(128, "OTEL_SPAN_EVENT_COUNT_LIMIT"),
EventAttrs: firstEnv(128, "OTEL_EVENT_ATTRIBUTE_COUNT_LIMIT"),
Links: firstEnv(128, "OTEL_SPAN_LINK_COUNT_LIMIT"),
LinkAttrs: firstEnv(128, "OTEL_LINK_ATTRIBUTE_COUNT_LIMIT"),
}
}
// firstEnv returns the parsed integer value of the first matching environment
// variable from keys. The defaultVal is returned if the value is not an
// integer or no match is found.
func firstEnv(defaultVal int, keys ...string) int {
for _, key := range keys {
strV := os.Getenv(key)
if strV == "" {
continue
}
v, err := strconv.Atoi(strV)
if err == nil {
return v
}
slog.Warn(
"invalid limit environment variable",
"error", err,
"key", key,
"value", strV,
)
}
return defaultVal
}
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