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csv.go
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csv.go
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// Copyright 2020 Nelson Elhage
//
// 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 trace
import (
"encoding/csv"
"encoding/json"
"fmt"
"os"
"strconv"
"strings"
"github.com/nelhage/llama/tracing"
)
func stringify(v interface{}) string {
switch t := v.(type) {
case string:
return t
case float64:
return strconv.FormatFloat(t, 'f', -1, 64)
case int64:
return strconv.FormatInt(t, 10)
case nil:
return ""
default:
return fmt.Sprintf("%v", t)
}
}
func collectGlobal(tree *TraceTree) map[string]interface{} {
global := make(map[string]interface{})
tree.EachSpan(func(span *tracing.Span) error {
if span.Fields != nil {
for k, v := range span.Fields {
if strings.HasPrefix(k, "global.") {
global[k] = v
}
}
}
return nil
})
return global
}
func treeToCSV(w *csv.Writer, tree *TraceTree, extra []string) {
var words []string
global := collectGlobal(tree)
var walk func(t *TraceTree, path string)
walk = func(t *TraceTree, path string) {
if path == "" {
path = t.span.Name
} else {
path = fmt.Sprintf("%s>%s", path, t.span.Name)
}
words = append(words[:0],
t.span.TraceId, t.span.ParentId, t.span.SpanId,
path, fmt.Sprintf("%d.%09d", t.span.Start.UTC().Unix(), t.span.Start.Nanosecond()),
strconv.FormatInt(t.span.Duration.Nanoseconds(), 10),
)
fields := make(map[string]interface{}, len(global)+len(t.span.Fields))
for k, v := range global {
fields[k] = v
}
for k, v := range t.span.Fields {
fields[k] = v
}
out, err := json.Marshal(fields)
if err != nil {
panic("json marshal")
}
words = append(words, string(out))
for _, col := range extra {
v := fields[col]
words = append(words, stringify(v))
}
w.Write(words)
for _, child := range t.children {
walk(child, path)
}
}
walk(tree, "")
}
func (c *TraceCommand) WriteCSV(spans []tracing.Span, trees []*TraceTree) error {
fh, err := os.Create(c.csv)
if err != nil {
return err
}
defer fh.Close()
w := csv.NewWriter(fh)
defer w.Flush()
var extraColumns []string
if c.csvColumns != "" {
extraColumns = strings.Split(c.csvColumns, ",")
}
headers := append(
[]string{
"trace", "parent", "span", "path", "start", "duration_ns", "fields",
}, extraColumns...)
w.Write(headers)
for _, tree := range trees {
treeToCSV(w, tree, extraColumns)
}
return nil
}