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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
// vespa logfmt command
// Author: arnej
package logfmt
import (
"bytes"
"encoding/json"
"fmt"
"strconv"
"strings"
"time"
)
type logFields struct {
timestamp string // seconds, optional fractional seconds
host string
pid string // pid, optional tid
service string
component string
level string
messages []string
}
// handle a line in "vespa.log" format; do filtering and formatting as specified in opts
func handleLine(opts *Options, line string) (string, error) {
fieldStrings := strings.SplitN(line, "\t", 7)
if len(fieldStrings) < 7 {
return "", fmt.Errorf("not enough fields: '%s'", line)
}
fields := logFields{
timestamp: fieldStrings[0],
host: fieldStrings[1],
pid: fieldStrings[2],
service: fieldStrings[3],
component: fieldStrings[4],
level: fieldStrings[5],
messages: fieldStrings[6:],
}
if !opts.showLevel(fields.level) {
return "", nil
}
if opts.OnlyHostname != "" && opts.OnlyHostname != fields.host {
return "", nil
}
if opts.OnlyPid != "" && opts.OnlyPid != fields.pid {
return "", nil
}
if opts.OnlyService != "" && opts.OnlyService != fields.service {
return "", nil
}
if opts.OnlyInternal && !isInternal(fields.component) {
return "", nil
}
if opts.ComponentFilter.unmatched(fields.component) {
return "", nil
}
if opts.MessageFilter.unmatched(strings.Join(fields.messages, "\t")) {
return "", nil
}
switch opts.Format {
case FormatRaw:
return line + "\n", nil
case FormatJSON:
return handleLineJson(opts, &fields)
case FormatVespa:
fallthrough
default:
return handleLineVespa(opts, &fields)
}
}
func parseTimestamp(timestamp string) (time.Time, error) {
secs, err := strconv.ParseFloat(timestamp, 64)
if err != nil {
return time.Time{}, err
}
nsecs := int64(secs * 1e9)
return time.Unix(0, nsecs), nil
}
type logFieldsJson struct {
Timestamp string `json:"timestamp"`
Host string `json:"host"`
Pid string `json:"pid"`
Service string `json:"service"`
Component string `json:"component"`
Level string `json:"level"`
Messages []string `json:"messages"`
}
func handleLineJson(_ *Options, fields *logFields) (string, error) {
timestamp, err := parseTimestamp(fields.timestamp)
if err != nil {
return "", err
}
outputFields := logFieldsJson{
Timestamp: timestamp.Format(time.RFC3339Nano),
Host: fields.host,
Pid: fields.pid,
Service: fields.service,
Component: fields.component,
Level: fields.level,
Messages: fields.messages,
}
buf := bytes.Buffer{}
if err := json.NewEncoder(&buf).Encode(&outputFields); err != nil {
return "", err
}
return buf.String(), nil
}
func handleLineVespa(opts *Options, fields *logFields) (string, error) {
var buf strings.Builder
if opts.showField("fmttime") {
timestamp, err := parseTimestamp(fields.timestamp)
if err != nil {
return "", err
}
if opts.showField("usecs") {
buf.WriteString(timestamp.Format("[2006-01-02 15:04:05.000000] "))
} else if opts.showField("msecs") {
buf.WriteString(timestamp.Format("[2006-01-02 15:04:05.000] "))
} else {
buf.WriteString(timestamp.Format("[2006-01-02 15:04:05] "))
}
} else if opts.showField("time") {
buf.WriteString(fields.timestamp)
buf.WriteString(" ")
}
if opts.showField("host") {
buf.WriteString(fmt.Sprintf("%-8s ", fields.host))
}
if opts.showField("level") {
buf.WriteString(fmt.Sprintf("%-7s ", strings.ToUpper(fields.level)))
}
if opts.showField("pid") {
// OnlyPid, _, _ := strings.Cut(pidfield, "/")
buf.WriteString(fmt.Sprintf("%6s ", fields.pid))
}
if opts.showField("service") {
if opts.TruncateService {
buf.WriteString(fmt.Sprintf("%-9.9s ", fields.service))
} else {
buf.WriteString(fmt.Sprintf("%-16s ", fields.service))
}
}
if opts.showField("component") {
if opts.TruncateComponent {
buf.WriteString(fmt.Sprintf("%-15.15s ", fields.component))
} else {
buf.WriteString(fmt.Sprintf("%s\t", fields.component))
}
}
if opts.showField("message") {
var msgBuf strings.Builder
for idx, message := range fields.messages {
if idx > 0 {
msgBuf.WriteString("\n\t")
}
if opts.DequoteNewlines {
message = strings.ReplaceAll(message, "\\n\\t", "\n\t")
message = strings.ReplaceAll(message, "\\n", "\n\t")
}
msgBuf.WriteString(message)
}
message := msgBuf.String()
if strings.Contains(message, "\n") {
buf.WriteString("\n\t")
}
buf.WriteString(message)
}
buf.WriteString("\n")
return buf.String(), nil
}
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