telegraf/plugins/parsers/grok/parser.go

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package grok
import (
"bufio"
"bytes"
"fmt"
"log"
"os"
"regexp"
"strconv"
"strings"
"time"
"github.com/vjeantet/grok"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/metric"
)
var timeLayouts = map[string]string{
"ts-ansic": "Mon Jan _2 15:04:05 2006",
"ts-unix": "Mon Jan _2 15:04:05 MST 2006",
"ts-ruby": "Mon Jan 02 15:04:05 -0700 2006",
"ts-rfc822": "02 Jan 06 15:04 MST",
"ts-rfc822z": "02 Jan 06 15:04 -0700", // RFC822 with numeric zone
"ts-rfc850": "Monday, 02-Jan-06 15:04:05 MST",
"ts-rfc1123": "Mon, 02 Jan 2006 15:04:05 MST",
"ts-rfc1123z": "Mon, 02 Jan 2006 15:04:05 -0700", // RFC1123 with numeric zone
"ts-rfc3339": "2006-01-02T15:04:05Z07:00",
"ts-rfc3339nano": "2006-01-02T15:04:05.999999999Z07:00",
"ts-httpd": "02/Jan/2006:15:04:05 -0700",
// These three are not exactly "layouts", but they are special cases that
// will get handled in the ParseLine function.
"ts-epoch": "EPOCH",
"ts-epochnano": "EPOCH_NANO",
"ts-syslog": "SYSLOG_TIMESTAMP",
"ts": "GENERIC_TIMESTAMP", // try parsing all known timestamp layouts.
}
const (
INT = "int"
TAG = "tag"
FLOAT = "float"
STRING = "string"
DURATION = "duration"
DROP = "drop"
EPOCH = "EPOCH"
EPOCH_NANO = "EPOCH_NANO"
SYSLOG_TIMESTAMP = "SYSLOG_TIMESTAMP"
GENERIC_TIMESTAMP = "GENERIC_TIMESTAMP"
)
var (
// matches named captures that contain a modifier.
// ie,
// %{NUMBER:bytes:int}
// %{IPORHOST:clientip:tag}
// %{HTTPDATE:ts1:ts-http}
// %{HTTPDATE:ts2:ts-"02 Jan 06 15:04"}
modifierRe = regexp.MustCompile(`%{\w+:(\w+):(ts-".+"|t?s?-?\w+)}`)
// matches a plain pattern name. ie, %{NUMBER}
patternOnlyRe = regexp.MustCompile(`%{(\w+)}`)
)
// Parser is the primary struct to handle and grok-patterns defined in the config toml
type Parser struct {
Patterns []string
// namedPatterns is a list of internally-assigned names to the patterns
// specified by the user in Patterns.
// They will look like:
// GROK_INTERNAL_PATTERN_0, GROK_INTERNAL_PATTERN_1, etc.
NamedPatterns []string
CustomPatterns string
CustomPatternFiles []string
Measurement string
DefaultTags map[string]string
// Timezone is an optional component to help render log dates to
// your chosen zone.
// Default: "" which renders UTC
// Options are as follows:
// 1. Local -- interpret based on machine localtime
// 2. "America/Chicago" -- Unix TZ values like those found in https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
// 3. UTC -- or blank/unspecified, will return timestamp in UTC
Timezone string
loc *time.Location
// typeMap is a map of patterns -> capture name -> modifier,
// ie, {
// "%{TESTLOG}":
// {
// "bytes": "int",
// "clientip": "tag"
// }
// }
typeMap map[string]map[string]string
// tsMap is a map of patterns -> capture name -> timestamp layout.
// ie, {
// "%{TESTLOG}":
// {
// "httptime": "02/Jan/2006:15:04:05 -0700"
// }
// }
tsMap map[string]map[string]string
// patterns is a map of all of the parsed patterns from CustomPatterns
// and CustomPatternFiles.
// ie, {
// "DURATION": "%{NUMBER}[nuµm]?s"
// "RESPONSE_CODE": "%{NUMBER:rc:tag}"
// }
patterns map[string]string
// foundTsLayouts is a slice of timestamp patterns that have been found
// in the log lines. This slice gets updated if the user uses the generic
// 'ts' modifier for timestamps. This slice is checked first for matches,
// so that previously-matched layouts get priority over all other timestamp
// layouts.
foundTsLayouts []string
timeFunc func() time.Time
g *grok.Grok
tsModder *tsModder
}
// Compile is a bound method to Parser which will process the options for our parser
func (p *Parser) Compile() error {
p.typeMap = make(map[string]map[string]string)
p.tsMap = make(map[string]map[string]string)
p.patterns = make(map[string]string)
p.tsModder = &tsModder{}
var err error
p.g, err = grok.NewWithConfig(&grok.Config{NamedCapturesOnly: true})
if err != nil {
return err
}
// Give Patterns fake names so that they can be treated as named
// "custom patterns"
p.NamedPatterns = make([]string, 0, len(p.Patterns))
for i, pattern := range p.Patterns {
pattern = strings.TrimSpace(pattern)
if pattern == "" {
continue
}
name := fmt.Sprintf("GROK_INTERNAL_PATTERN_%d", i)
p.CustomPatterns += "\n" + name + " " + pattern + "\n"
p.NamedPatterns = append(p.NamedPatterns, "%{"+name+"}")
}
if len(p.NamedPatterns) == 0 {
return fmt.Errorf("pattern required")
}
// Combine user-supplied CustomPatterns with DEFAULT_PATTERNS and parse
// them together as the same type of pattern.
p.CustomPatterns = DEFAULT_PATTERNS + p.CustomPatterns
if len(p.CustomPatterns) != 0 {
scanner := bufio.NewScanner(strings.NewReader(p.CustomPatterns))
p.addCustomPatterns(scanner)
}
// Parse any custom pattern files supplied.
for _, filename := range p.CustomPatternFiles {
file, fileErr := os.Open(filename)
if fileErr != nil {
return fileErr
}
scanner := bufio.NewScanner(bufio.NewReader(file))
p.addCustomPatterns(scanner)
}
p.loc, err = time.LoadLocation(p.Timezone)
if err != nil {
log.Printf("W! improper timezone supplied (%s), setting loc to UTC", p.Timezone)
p.loc, _ = time.LoadLocation("UTC")
}
if p.timeFunc == nil {
p.timeFunc = time.Now
}
return p.compileCustomPatterns()
}
// ParseLine is the primary function to process individual lines, returning the metrics
func (p *Parser) ParseLine(line string) (telegraf.Metric, error) {
var err error
// values are the parsed fields from the log line
var values map[string]string
// the matching pattern string
var patternName string
for _, pattern := range p.NamedPatterns {
if values, err = p.g.Parse(pattern, line); err != nil {
return nil, err
}
if len(values) != 0 {
patternName = pattern
break
}
}
if len(values) == 0 {
2017-04-14 20:47:43 +00:00
log.Printf("D! Grok no match found for: %q", line)
return nil, nil
}
fields := make(map[string]interface{})
tags := make(map[string]string)
//add default tags
for k, v := range p.DefaultTags {
tags[k] = v
}
timestamp := time.Now()
for k, v := range values {
if k == "" || v == "" {
continue
}
// t is the modifier of the field
var t string
// check if pattern has some modifiers
if types, ok := p.typeMap[patternName]; ok {
t = types[k]
}
// if we didn't find a modifier, check if we have a timestamp layout
if t == "" {
if ts, ok := p.tsMap[patternName]; ok {
// check if the modifier is a timestamp layout
if layout, ok := ts[k]; ok {
t = layout
}
}
}
// if we didn't find a type OR timestamp modifier, assume string
if t == "" {
t = STRING
}
switch t {
case INT:
iv, err := strconv.ParseInt(v, 10, 64)
if err != nil {
log.Printf("E! Error parsing %s to int: %s", v, err)
} else {
fields[k] = iv
}
case FLOAT:
fv, err := strconv.ParseFloat(v, 64)
if err != nil {
log.Printf("E! Error parsing %s to float: %s", v, err)
} else {
fields[k] = fv
}
case DURATION:
d, err := time.ParseDuration(v)
if err != nil {
log.Printf("E! Error parsing %s to duration: %s", v, err)
} else {
fields[k] = int64(d)
}
case TAG:
tags[k] = v
case STRING:
fields[k] = strings.Trim(v, `"`)
case EPOCH:
parts := strings.SplitN(v, ".", 2)
if len(parts) == 0 {
log.Printf("E! Error parsing %s to timestamp: %s", v, err)
break
}
sec, err := strconv.ParseInt(parts[0], 10, 64)
if err != nil {
log.Printf("E! Error parsing %s to timestamp: %s", v, err)
break
}
ts := time.Unix(sec, 0)
if len(parts) == 2 {
padded := fmt.Sprintf("%-9s", parts[1])
nsString := strings.Replace(padded[:9], " ", "0", -1)
nanosec, err := strconv.ParseInt(nsString, 10, 64)
if err != nil {
log.Printf("E! Error parsing %s to timestamp: %s", v, err)
break
}
ts = ts.Add(time.Duration(nanosec) * time.Nanosecond)
}
timestamp = ts
case EPOCH_NANO:
iv, err := strconv.ParseInt(v, 10, 64)
if err != nil {
log.Printf("E! Error parsing %s to int: %s", v, err)
} else {
timestamp = time.Unix(0, iv)
}
case SYSLOG_TIMESTAMP:
ts, err := time.ParseInLocation(time.Stamp, v, p.loc)
if err == nil {
if ts.Year() == 0 {
ts = ts.AddDate(timestamp.Year(), 0, 0)
}
timestamp = ts
} else {
log.Printf("E! Error parsing %s to time layout [%s]: %s", v, t, err)
}
case GENERIC_TIMESTAMP:
var foundTs bool
// first try timestamp layouts that we've already found
for _, layout := range p.foundTsLayouts {
ts, err := time.ParseInLocation(layout, v, p.loc)
if err == nil {
timestamp = ts
foundTs = true
break
}
}
// if we haven't found a timestamp layout yet, try all timestamp
// layouts.
if !foundTs {
for _, layout := range timeLayouts {
ts, err := time.ParseInLocation(layout, v, p.loc)
if err == nil {
timestamp = ts
foundTs = true
p.foundTsLayouts = append(p.foundTsLayouts, layout)
break
}
}
}
// if we still haven't found a timestamp layout, log it and we will
// just use time.Now()
if !foundTs {
log.Printf("E! Error parsing timestamp [%s], could not find any "+
"suitable time layouts.", v)
}
case DROP:
// goodbye!
default:
v = strings.Replace(v, ",", ".", -1)
ts, err := time.ParseInLocation(t, v, p.loc)
if err == nil {
timestamp = ts
} else {
log.Printf("E! Error parsing %s to time layout [%s]: %s", v, t, err)
}
}
}
if len(fields) == 0 {
return nil, fmt.Errorf("logparser_grok: must have one or more fields")
}
return metric.New(p.Measurement, tags, fields, p.tsModder.tsMod(timestamp))
}
func (p *Parser) Parse(buf []byte) ([]telegraf.Metric, error) {
metrics := make([]telegraf.Metric, 0)
scanner := bufio.NewScanner(bytes.NewReader(buf))
for scanner.Scan() {
line := scanner.Text()
m, err := p.ParseLine(line)
if err != nil {
return nil, err
}
if m == nil {
continue
}
metrics = append(metrics, m)
}
return metrics, nil
}
func (p *Parser) SetDefaultTags(tags map[string]string) {
p.DefaultTags = tags
}
func (p *Parser) addCustomPatterns(scanner *bufio.Scanner) {
for scanner.Scan() {
line := strings.TrimSpace(scanner.Text())
if len(line) > 0 && line[0] != '#' {
names := strings.SplitN(line, " ", 2)
p.patterns[names[0]] = names[1]
}
}
}
func (p *Parser) compileCustomPatterns() error {
var err error
// check if the pattern contains a subpattern that is already defined
// replace it with the subpattern for modifier inheritance.
for i := 0; i < 2; i++ {
for name, pattern := range p.patterns {
subNames := patternOnlyRe.FindAllStringSubmatch(pattern, -1)
for _, subName := range subNames {
if subPattern, ok := p.patterns[subName[1]]; ok {
pattern = strings.Replace(pattern, subName[0], subPattern, 1)
}
}
p.patterns[name] = pattern
}
}
// check if pattern contains modifiers. Parse them out if it does.
for name, pattern := range p.patterns {
if modifierRe.MatchString(pattern) {
// this pattern has modifiers, so parse out the modifiers
pattern, err = p.parseTypedCaptures(name, pattern)
if err != nil {
return err
}
p.patterns[name] = pattern
}
}
return p.g.AddPatternsFromMap(p.patterns)
}
// parseTypedCaptures parses the capture modifiers, and then deletes the
// modifier from the line so that it is a valid "grok" pattern again.
// ie,
// %{NUMBER:bytes:int} => %{NUMBER:bytes} (stores %{NUMBER}->bytes->int)
// %{IPORHOST:clientip:tag} => %{IPORHOST:clientip} (stores %{IPORHOST}->clientip->tag)
func (p *Parser) parseTypedCaptures(name, pattern string) (string, error) {
matches := modifierRe.FindAllStringSubmatch(pattern, -1)
// grab the name of the capture pattern
patternName := "%{" + name + "}"
// create type map for this pattern
p.typeMap[patternName] = make(map[string]string)
p.tsMap[patternName] = make(map[string]string)
// boolean to verify that each pattern only has a single ts- data type.
hasTimestamp := false
for _, match := range matches {
// regex capture 1 is the name of the capture
// regex capture 2 is the modifier of the capture
if strings.HasPrefix(match[2], "ts") {
if hasTimestamp {
return pattern, fmt.Errorf("logparser pattern compile error: "+
"Each pattern is allowed only one named "+
"timestamp data type. pattern: %s", pattern)
}
if layout, ok := timeLayouts[match[2]]; ok {
// built-in time format
p.tsMap[patternName][match[1]] = layout
} else {
// custom time format
p.tsMap[patternName][match[1]] = strings.TrimSuffix(strings.TrimPrefix(match[2], `ts-"`), `"`)
}
hasTimestamp = true
} else {
p.typeMap[patternName][match[1]] = match[2]
}
// the modifier is not a valid part of a "grok" pattern, so remove it
// from the pattern.
pattern = strings.Replace(pattern, ":"+match[2]+"}", "}", 1)
}
return pattern, nil
}
// tsModder is a struct for incrementing identical timestamps of log lines
// so that we don't push identical metrics that will get overwritten.
type tsModder struct {
dupe time.Time
last time.Time
incr time.Duration
incrn time.Duration
rollover time.Duration
}
// tsMod increments the given timestamp one unit more from the previous
// duplicate timestamp.
// the increment unit is determined as the next smallest time unit below the
// most significant time unit of ts.
// ie, if the input is at ms precision, it will increment it 1µs.
func (t *tsModder) tsMod(ts time.Time) time.Time {
defer func() { t.last = ts }()
// don't mod the time if we don't need to
if t.last.IsZero() || ts.IsZero() {
t.incrn = 0
t.rollover = 0
return ts
}
if !ts.Equal(t.last) && !ts.Equal(t.dupe) {
t.incr = 0
t.incrn = 0
t.rollover = 0
return ts
}
if ts.Equal(t.last) {
t.dupe = ts
}
if ts.Equal(t.dupe) && t.incr == time.Duration(0) {
tsNano := ts.UnixNano()
d := int64(10)
counter := 1
for {
a := tsNano % d
if a > 0 {
break
}
d = d * 10
counter++
}
switch {
case counter <= 6:
t.incr = time.Nanosecond
case counter <= 9:
t.incr = time.Microsecond
case counter > 9:
t.incr = time.Millisecond
}
}
t.incrn++
if t.incrn == 999 && t.incr > time.Nanosecond {
t.rollover = t.incr * t.incrn
t.incrn = 1
t.incr = t.incr / 1000
if t.incr < time.Nanosecond {
t.incr = time.Nanosecond
}
}
return ts.Add(t.incr*t.incrn + t.rollover)
}