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hook.go
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hook.go
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package logrus
import (
"errors"
"github.com/sirupsen/logrus"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
"go.opentelemetry.io/otel/trace"
)
// Ref to https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/logs/overview.md#json-formats
const (
traceIDKey = "trace_id"
spanIDKey = "span_id"
traceFlagsKey = "trace_flags"
logEventKey = "log"
)
var (
logSeverityTextKey = attribute.Key("otel.log.severity.text")
logMessageKey = attribute.Key("otel.log.message")
)
type TraceHookConfig struct {
recordStackTraceInSpan bool
enableLevels []logrus.Level
errorSpanLevel logrus.Level
}
type TraceHook struct {
cfg *TraceHookConfig
}
func NewTraceHook(cfg *TraceHookConfig) *TraceHook {
return &TraceHook{cfg: cfg}
}
func (h *TraceHook) Levels() []logrus.Level {
return h.cfg.enableLevels
}
func (h *TraceHook) Fire(entry *logrus.Entry) error {
if entry.Context == nil {
return nil
}
span := trace.SpanFromContext(entry.Context)
if !span.IsRecording() {
return nil
}
// attach span context to log entry data fields
entry.Data[traceIDKey] = span.SpanContext().TraceID()
entry.Data[spanIDKey] = span.SpanContext().SpanID()
entry.Data[traceFlagsKey] = span.SpanContext().TraceFlags()
// attach log to span event attributes
attrs := []attribute.KeyValue{
logMessageKey.String(entry.Message),
logSeverityTextKey.String(OtelSeverityText(entry.Level)),
}
span.AddEvent(logEventKey, trace.WithAttributes(attrs...))
// set span status
if entry.Level <= h.cfg.errorSpanLevel {
span.SetStatus(codes.Error, entry.Message)
span.RecordError(errors.New(entry.Message), trace.WithStackTrace(h.cfg.recordStackTraceInSpan))
}
return nil
}