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- // Copyright 2017, OpenCensus 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 exporter // import "go.opencensus.io/examples/exporter"
-
- import (
- "encoding/hex"
- "fmt"
- "regexp"
- "time"
-
- "go.opencensus.io/stats/view"
- "go.opencensus.io/trace"
- )
-
- // indent these many spaces
- const indent = " "
-
- // reZero provides a simple way to detect an empty ID
- var reZero = regexp.MustCompile(`^0+$`)
-
- // PrintExporter is a stats and trace exporter that logs
- // the exported data to the console.
- //
- // The intent is help new users familiarize themselves with the
- // capabilities of opencensus.
- //
- // This should NOT be used for production workloads.
- type PrintExporter struct{}
-
- // ExportView logs the view data.
- func (e *PrintExporter) ExportView(vd *view.Data) {
- for _, row := range vd.Rows {
- fmt.Printf("%v %-45s", vd.End.Format("15:04:05"), vd.View.Name)
-
- switch v := row.Data.(type) {
- case *view.DistributionData:
- fmt.Printf("distribution: min=%.1f max=%.1f mean=%.1f", v.Min, v.Max, v.Mean)
- case *view.CountData:
- fmt.Printf("count: value=%v", v.Value)
- case *view.SumData:
- fmt.Printf("sum: value=%v", v.Value)
- case *view.LastValueData:
- fmt.Printf("last: value=%v", v.Value)
- }
- fmt.Println()
-
- for _, tag := range row.Tags {
- fmt.Printf("%v- %v=%v\n", indent, tag.Key.Name(), tag.Value)
- }
- }
- }
-
- // ExportSpan logs the trace span.
- func (e *PrintExporter) ExportSpan(vd *trace.SpanData) {
- var (
- traceID = hex.EncodeToString(vd.SpanContext.TraceID[:])
- spanID = hex.EncodeToString(vd.SpanContext.SpanID[:])
- parentSpanID = hex.EncodeToString(vd.ParentSpanID[:])
- )
- fmt.Println()
- fmt.Println("#----------------------------------------------")
- fmt.Println()
- fmt.Println("TraceID: ", traceID)
- fmt.Println("SpanID: ", spanID)
- if !reZero.MatchString(parentSpanID) {
- fmt.Println("ParentSpanID:", parentSpanID)
- }
-
- fmt.Println()
- fmt.Printf("Span: %v\n", vd.Name)
- fmt.Printf("Status: %v [%v]\n", vd.Status.Message, vd.Status.Code)
- fmt.Printf("Elapsed: %v\n", vd.EndTime.Sub(vd.StartTime).Round(time.Millisecond))
-
- if len(vd.Annotations) > 0 {
- fmt.Println()
- fmt.Println("Annotations:")
- for _, item := range vd.Annotations {
- fmt.Print(indent, item.Message)
- for k, v := range item.Attributes {
- fmt.Printf(" %v=%v", k, v)
- }
- fmt.Println()
- }
- }
-
- if len(vd.Attributes) > 0 {
- fmt.Println()
- fmt.Println("Attributes:")
- for k, v := range vd.Attributes {
- fmt.Printf("%v- %v=%v\n", indent, k, v)
- }
- }
- }
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