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tracing.go
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tracing.go
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// Copyright 2021 TiKV Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
// NOTE: The code in this file is based on code from the
// TiDB project, licensed under the Apache License v 2.0
//
// https://github.com/pingcap/tidb/tree/cc5e161ac06827589c4966674597c137cc9e809c/store/tikv/logutil/tracing.go
//
// Copyright 2021 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package logutil
import (
"context"
"fmt"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/log"
)
// TraceEventKey presents the TraceEventKey in span log.
var TraceEventKey = "event"
// Event records event in current tracing span.
func Event(ctx context.Context, event string) {
if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
span.LogFields(log.String(TraceEventKey, event))
}
}
// Eventf records event in current tracing span with format support.
func Eventf(ctx context.Context, format string, args ...interface{}) {
if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
span.LogFields(log.String(TraceEventKey, fmt.Sprintf(format, args...)))
}
}
// SetTag sets tag kv-pair in current tracing span
func SetTag(ctx context.Context, key string, value interface{}) {
if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
span.SetTag(key, value)
}
}