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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package log // import "go.opentelemetry.io/otel/sdk/log"
import (
"context"
"fmt"
"time"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/log"
"go.opentelemetry.io/otel/log/embedded"
"go.opentelemetry.io/otel/metric"
"go.opentelemetry.io/otel/sdk"
"go.opentelemetry.io/otel/sdk/instrumentation"
"go.opentelemetry.io/otel/sdk/log/internal/x"
semconv "go.opentelemetry.io/otel/semconv/v1.37.0"
"go.opentelemetry.io/otel/semconv/v1.37.0/otelconv"
"go.opentelemetry.io/otel/trace"
)
var now = time.Now
// Compile-time check logger implements log.Logger.
var _ log.Logger = (*logger)(nil)
type logger struct {
embedded.Logger
provider *LoggerProvider
instrumentationScope instrumentation.Scope
selfObservabilityEnabled bool
logCreatedMetric otelconv.SDKLogCreated
}
func newLogger(p *LoggerProvider, scope instrumentation.Scope) *logger {
l := &logger{
provider: p,
instrumentationScope: scope,
}
if !x.SelfObservability.Enabled() {
return l
}
l.selfObservabilityEnabled = true
mp := otel.GetMeterProvider()
m := mp.Meter("go.opentelemetry.io/otel/sdk/log",
metric.WithInstrumentationVersion(sdk.Version()),
metric.WithSchemaURL(semconv.SchemaURL))
var err error
if l.logCreatedMetric, err = otelconv.NewSDKLogCreated(m); err != nil {
err = fmt.Errorf("failed to create log created metric: %w", err)
otel.Handle(err)
}
return l
}
func (l *logger) Emit(ctx context.Context, r log.Record) {
newRecord := l.newRecord(ctx, r)
for _, p := range l.provider.processors {
if err := p.OnEmit(ctx, &newRecord); err != nil {
otel.Handle(err)
}
}
}
// Enabled returns true if at least one Processor held by the LoggerProvider
// that created the logger will process param for the provided context and param.
//
// If it is not possible to definitively determine the param will be
// processed, true will be returned by default. A value of false will only be
// returned if it can be positively verified that no Processor will process.
func (l *logger) Enabled(ctx context.Context, param log.EnabledParameters) bool {
p := EnabledParameters{
InstrumentationScope: l.instrumentationScope,
Severity: param.Severity,
EventName: param.EventName,
}
// If there are more Processors than FilterProcessors,
// which means not all Processors are FilterProcessors,
// we cannot be sure that all Processors will drop the record.
// Therefore, return true.
//
// If all Processors are FilterProcessors, check if any is enabled.
return len(l.provider.processors) > len(l.provider.fltrProcessors) || anyEnabled(ctx, p, l.provider.fltrProcessors)
}
func anyEnabled(ctx context.Context, param EnabledParameters, fltrs []FilterProcessor) bool {
for _, f := range fltrs {
if f.Enabled(ctx, param) {
// At least one Processor will process the Record.
return true
}
}
// No Processor will process the record
return false
}
func (l *logger) newRecord(ctx context.Context, r log.Record) Record {
sc := trace.SpanContextFromContext(ctx)
newRecord := Record{
eventName: r.EventName(),
timestamp: r.Timestamp(),
observedTimestamp: r.ObservedTimestamp(),
severity: r.Severity(),
severityText: r.SeverityText(),
traceID: sc.TraceID(),
spanID: sc.SpanID(),
traceFlags: sc.TraceFlags(),
resource: l.provider.resource,
scope: &l.instrumentationScope,
attributeValueLengthLimit: l.provider.attributeValueLengthLimit,
attributeCountLimit: l.provider.attributeCountLimit,
allowDupKeys: l.provider.allowDupKeys,
}
if l.selfObservabilityEnabled {
l.logCreatedMetric.Add(ctx, 1)
}
// This ensures we deduplicate key-value collections in the log body
newRecord.SetBody(r.Body())
// This field SHOULD be set once the event is observed by OpenTelemetry.
if newRecord.observedTimestamp.IsZero() {
newRecord.observedTimestamp = now()
}
r.WalkAttributes(func(kv log.KeyValue) bool {
newRecord.AddAttributes(kv)
return true
})
return newRecord
}
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