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exporter.go
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/
exporter.go
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// Copyright 2020 Buf Technologies, 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,
// 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 observabilityzap
import (
"context"
"time"
"go.opencensus.io/trace"
"go.uber.org/zap"
)
type zapTracer struct {
logger *zap.Logger
}
func newExporter(logger *zap.Logger) *zapTracer {
return &zapTracer{
logger: logger,
}
}
func (t *zapTracer) Run(ctx context.Context) error {
// Note, trace.RegisterExporter registers to a global exporter registry
// in the OpenCensus trace package. Generally we avoid this sort of
// thing, because globals make it hard to reason about package dependencies
// and makes testing harder. However, in this case it's the workflow
// intended by the designers of the package, and working around it
// turns into a real messy endeavour.
trace.RegisterExporter(t)
return nil
}
// ExportSpan implements the opencensus trace.Exporter interface.
func (t *zapTracer) ExportSpan(sd *trace.SpanData) {
if sd == nil || !sd.IsSampled() {
return
}
checkedEntry := t.logger.Check(zap.DebugLevel, sd.Message)
if checkedEntry == nil {
return
}
fields := []zap.Field{
zap.String("name", sd.Name),
zap.String("message", sd.Message),
zap.Duration("duration", time.Since(sd.StartTime)),
}
for key, att := range sd.Attributes {
fields = append(fields, zap.Any(key, att))
}
checkedEntry.Write(fields...)
}