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cloudflare.go
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cloudflare.go
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/*
* Copyright (c) 2017, The Easegress Authors
* All rights reserved.
*
* 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,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package tracing
import (
"context"
"net/http"
"strconv"
"time"
"github.com/megaease/easegress/v2/pkg/util/fasttime"
"go.opentelemetry.io/otel/attribute"
)
const (
cfSpanName = "cloudflare"
cfRayHeader = "cf-ray"
cfSecHeader = "x-ts-sec"
cfMsecHeader = "x-ts-msec"
)
// newSpanForCloudflare creates a new span for requests from cloudflare.
// It returns nil if the request is not from cloudflare.
// It creates a normal span if the request is from cloudflare but the
// required headers are not set.
func newSpanForCloudflare(ctx context.Context, t *Tracer, spanName string, req *http.Request) (span *Span) {
rayID := req.Header.Get(cfRayHeader)
// not a cloudflare request
if rayID == "" {
return
}
defer func() {
if span == nil {
span = t.newSpanWithStart(ctx, spanName, fasttime.Now())
span.SetAttributes(attribute.String("cf.ray", rayID))
}
}()
sec := req.Header.Get(cfSecHeader)
if sec == "" {
return
}
msec := req.Header.Get(cfMsecHeader)
if msec == "" {
return
}
tm, err := strconv.ParseInt(sec+msec, 10, 64)
if err != nil {
return
}
cfSpan := t.newSpanWithStart(ctx, cfSpanName, time.UnixMilli(tm))
cfSpan.SetAttributes(attribute.String("cf.ray", rayID))
span = cfSpan.NewChild(spanName)
span.cdnSpan = cfSpan
return
}