/
traceutil.go
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/
traceutil.go
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// Copyright 2016 Istio 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,
// 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 opencensus
import (
"go.opencensus.io/plugin/ochttp/propagation/b3"
"go.opencensus.io/trace"
)
// ExtractParentContext returns an OpenCensus SpanContext that corresponds to
// the parent of the given trace and parent span id that are in the hex encoded
// string that comes from tracespan instances. The second return value will be
// false if the trace id is invalid.
func ExtractParentContext(traceID, parentSpanID string) (trace.SpanContext, bool) {
var (
parentContext trace.SpanContext
ok bool
)
if parentContext.TraceID, ok = b3.ParseTraceID(traceID); !ok {
return trace.SpanContext{}, false
}
parentContext.SpanID, _ = b3.ParseSpanID(parentSpanID)
return parentContext, true
}
// ExtractSpanContext returns an OpenCensus SpanContext that corresponds to the
// the given span id and parent span context. The second return value will be
// false if the span id is invalid.
func ExtractSpanContext(spanID string, parent trace.SpanContext) (trace.SpanContext, bool) {
var (
spanContext trace.SpanContext
ok bool
)
spanContext.TraceID = parent.TraceID
if spanContext.SpanID, ok = b3.ParseSpanID(spanID); !ok {
return trace.SpanContext{}, false
}
return spanContext, true
}