VictoriaMetrics/lib/logstorage/pipe_format.go

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package logstorage
import (
"encoding/base64"
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"fmt"
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"math"
"strings"
"unicode"
"unicode/utf8"
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"unsafe"
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"github.com/valyala/quicktemplate"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
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)
// pipeFormat processes '| format ...' pipe.
//
// See https://docs.victoriametrics.com/victorialogs/logsql/#format-pipe
type pipeFormat struct {
formatStr string
steps []patternStep
resultField string
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keepOriginalFields bool
skipEmptyResults bool
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// iff is an optional filter for skipping the format func
iff *ifFilter
}
func (pf *pipeFormat) String() string {
s := "format"
if pf.iff != nil {
s += " " + pf.iff.String()
}
s += " " + quoteTokenIfNeeded(pf.formatStr)
if !isMsgFieldName(pf.resultField) {
s += " as " + quoteTokenIfNeeded(pf.resultField)
}
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if pf.keepOriginalFields {
s += " keep_original_fields"
}
if pf.skipEmptyResults {
s += " skip_empty_results"
}
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return s
}
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func (pf *pipeFormat) canLiveTail() bool {
return true
}
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func (pf *pipeFormat) updateNeededFields(neededFields, unneededFields fieldsSet) {
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if neededFields.isEmpty() {
if pf.iff != nil {
neededFields.addFields(pf.iff.neededFields)
}
return
}
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if neededFields.contains("*") {
if !unneededFields.contains(pf.resultField) {
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if !pf.keepOriginalFields && !pf.skipEmptyResults {
unneededFields.add(pf.resultField)
}
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if pf.iff != nil {
unneededFields.removeFields(pf.iff.neededFields)
}
for _, step := range pf.steps {
if step.field != "" {
unneededFields.remove(step.field)
}
}
}
} else {
if neededFields.contains(pf.resultField) {
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if !pf.keepOriginalFields && !pf.skipEmptyResults {
neededFields.remove(pf.resultField)
}
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if pf.iff != nil {
neededFields.addFields(pf.iff.neededFields)
}
for _, step := range pf.steps {
if step.field != "" {
neededFields.add(step.field)
}
}
}
}
}
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func (pf *pipeFormat) hasFilterInWithQuery() bool {
return pf.iff.hasFilterInWithQuery()
}
func (pf *pipeFormat) initFilterInValues(cache *inValuesCache, getFieldValuesFunc getFieldValuesFunc) (pipe, error) {
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iffNew, err := pf.iff.initFilterInValues(cache, getFieldValuesFunc)
if err != nil {
return nil, err
}
pfNew := *pf
pfNew.iff = iffNew
return &pfNew, nil
}
func (pf *pipeFormat) visitSubqueries(visitFunc func(q *Query)) {
pf.iff.visitSubqueries(visitFunc)
}
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func (pf *pipeFormat) newPipeProcessor(workersCount int, _ <-chan struct{}, _ func(), ppNext pipeProcessor) pipeProcessor {
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return &pipeFormatProcessor{
pf: pf,
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ppNext: ppNext,
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shards: make([]pipeFormatProcessorShard, workersCount),
}
}
type pipeFormatProcessor struct {
pf *pipeFormat
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ppNext pipeProcessor
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shards []pipeFormatProcessorShard
}
type pipeFormatProcessorShard struct {
pipeFormatProcessorShardNopad
// The padding prevents false sharing on widespread platforms with 128 mod (cache line size) = 0 .
_ [128 - unsafe.Sizeof(pipeFormatProcessorShardNopad{})%128]byte
}
type pipeFormatProcessorShardNopad struct {
bm bitmap
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a arena
rc resultColumn
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}
func (pfp *pipeFormatProcessor) writeBlock(workerID uint, br *blockResult) {
if br.rowsLen == 0 {
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return
}
shard := &pfp.shards[workerID]
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pf := pfp.pf
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bm := &shard.bm
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if iff := pf.iff; iff != nil {
bm.init(br.rowsLen)
bm.setBits()
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iff.f.applyToBlockResult(br, bm)
if bm.isZero() {
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pfp.ppNext.writeBlock(workerID, br)
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return
}
}
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shard.rc.name = pf.resultField
resultColumn := br.getColumnByName(pf.resultField)
for rowIdx := 0; rowIdx < br.rowsLen; rowIdx++ {
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v := ""
if pf.iff == nil || bm.isSetBit(rowIdx) {
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v = shard.formatRow(pf, br, rowIdx)
if v == "" && pf.skipEmptyResults || pf.keepOriginalFields {
if vOrig := resultColumn.getValueAtRow(br, rowIdx); vOrig != "" {
v = vOrig
}
}
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} else {
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v = resultColumn.getValueAtRow(br, rowIdx)
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}
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shard.rc.addValue(v)
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}
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br.addResultColumn(&shard.rc)
pfp.ppNext.writeBlock(workerID, br)
shard.a.reset()
shard.rc.reset()
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}
func (pfp *pipeFormatProcessor) flush() error {
return nil
}
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func (shard *pipeFormatProcessorShard) formatRow(pf *pipeFormat, br *blockResult, rowIdx int) string {
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b := shard.a.b
bLen := len(b)
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for _, step := range pf.steps {
b = append(b, step.prefix...)
if step.field != "" {
c := br.getColumnByName(step.field)
v := c.getValueAtRow(br, rowIdx)
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switch step.fieldOpt {
case "base64decode":
result, ok := appendBase64Decode(b, v)
if !ok {
b = append(b, v...)
} else {
b = result
}
case "base64encode":
b = appendBase64Encode(b, v)
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case "duration":
nsecs, ok := tryParseInt64(v)
if !ok {
b = append(b, v...)
} else {
b = marshalDurationString(b, nsecs)
}
case "hexdecode":
b = appendHexDecode(b, v)
case "hexencode":
b = appendHexEncode(b, v)
case "hexnumdecode":
b = appendHexUint64Decode(b, v)
case "hexnumencode":
n, ok := tryParseUint64(v)
if !ok {
b = append(b, v...)
} else {
b = appendHexUint64Encode(b, n)
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}
case "ipv4":
ipNum, ok := tryParseUint64(v)
if !ok || ipNum > math.MaxUint32 {
b = append(b, v...)
} else {
b = marshalIPv4String(b, uint32(ipNum))
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}
case "lc":
b = appendLowercase(b, v)
case "time":
nsecs, ok := tryParseInt64(v)
if !ok {
b = append(b, v...)
} else {
b = marshalTimestampRFC3339NanoString(b, nsecs)
}
case "q":
b = quicktemplate.AppendJSONString(b, v, true)
case "uc":
b = appendUppercase(b, v)
case "urldecode":
b = appendURLDecode(b, v)
case "urlencode":
b = appendURLEncode(b, v)
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default:
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b = append(b, v...)
}
}
}
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shard.a.b = b
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return bytesutil.ToUnsafeString(b[bLen:])
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}
func parsePipeFormat(lex *lexer) (pipe, error) {
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if !lex.isKeyword("format") {
return nil, fmt.Errorf("unexpected token: %q; want %q", lex.token, "format")
}
lex.nextToken()
// parse optional if (...)
var iff *ifFilter
if lex.isKeyword("if") {
f, err := parseIfFilter(lex)
if err != nil {
return nil, err
}
iff = f
}
// parse format
formatStr, err := getCompoundToken(lex)
if err != nil {
return nil, fmt.Errorf("cannot read 'format': %w", err)
}
steps, err := parsePatternSteps(formatStr)
if err != nil {
return nil, fmt.Errorf("cannot parse 'pattern' %q: %w", formatStr, err)
}
// parse optional 'as ...` part
resultField := "_msg"
if lex.isKeyword("as") {
lex.nextToken()
field, err := parseFieldName(lex)
if err != nil {
return nil, fmt.Errorf("cannot parse result field after 'format %q as': %w", formatStr, err)
}
resultField = field
}
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keepOriginalFields := false
skipEmptyResults := false
switch {
case lex.isKeyword("keep_original_fields"):
lex.nextToken()
keepOriginalFields = true
case lex.isKeyword("skip_empty_results"):
lex.nextToken()
skipEmptyResults = true
}
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pf := &pipeFormat{
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formatStr: formatStr,
steps: steps,
resultField: resultField,
keepOriginalFields: keepOriginalFields,
skipEmptyResults: skipEmptyResults,
iff: iff,
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}
return pf, nil
}
func appendUppercase(dst []byte, s string) []byte {
for _, r := range s {
r = unicode.ToUpper(r)
dst = utf8.AppendRune(dst, r)
}
return dst
}
func appendLowercase(dst []byte, s string) []byte {
for _, r := range s {
r = unicode.ToLower(r)
dst = utf8.AppendRune(dst, r)
}
return dst
}
func appendURLDecode(dst []byte, s string) []byte {
for len(s) > 0 {
n := strings.IndexAny(s, "%+")
if n < 0 {
return append(dst, s...)
}
dst = append(dst, s[:n]...)
ch := s[n]
s = s[n+1:]
if ch == '+' {
dst = append(dst, ' ')
continue
}
if len(s) < 2 {
dst = append(dst, '%')
continue
}
hi, ok1 := unhexChar(s[0])
lo, ok2 := unhexChar(s[1])
if !ok1 || !ok2 {
dst = append(dst, '%')
continue
}
ch = (hi << 4) | lo
dst = append(dst, ch)
s = s[2:]
}
return dst
}
func appendURLEncode(dst []byte, s string) []byte {
n := len(s)
for i := 0; i < n; i++ {
c := s[i]
// See http://www.w3.org/TR/html5/forms.html#form-submission-algorithm
if c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z' || c >= '0' && c <= '9' ||
c == '-' || c == '.' || c == '_' {
dst = append(dst, c)
} else {
if c == ' ' {
dst = append(dst, '+')
} else {
dst = append(dst, '%', hexCharUpper(c>>4), hexCharUpper(c&15))
}
}
}
return dst
}
func hexCharUpper(c byte) byte {
if c < 10 {
return '0' + c
}
return c - 10 + 'A'
}
func unhexChar(c byte) (byte, bool) {
if c >= '0' && c <= '9' {
return c - '0', true
}
if c >= 'A' && c <= 'F' {
return c - 'A' + 10, true
}
if c >= 'a' && c <= 'f' {
return c - 'a' + 10, true
}
return 0, false
}
func appendHexUint64Encode(dst []byte, n uint64) []byte {
for shift := 60; shift >= 0; shift -= 4 {
dst = append(dst, hexCharUpper(byte(n>>shift)&15))
}
return dst
}
func appendHexUint64Decode(dst []byte, s string) []byte {
if len(s) > 16 {
return append(dst, s...)
}
sOrig := s
n := uint64(0)
for len(s) > 0 {
x, ok := unhexChar(s[0])
if !ok {
return append(dst, sOrig...)
}
n = (n << 4) | uint64(x)
s = s[1:]
}
return marshalUint64String(dst, n)
}
func appendHexEncode(dst []byte, s string) []byte {
for i := 0; i < len(s); i++ {
c := s[i]
hi := hexCharUpper(c >> 4)
lo := hexCharUpper(c & 15)
dst = append(dst, hi, lo)
}
return dst
}
func appendHexDecode(dst []byte, s string) []byte {
for len(s) >= 2 {
hi, ok1 := unhexChar(s[0])
lo, ok2 := unhexChar(s[1])
if !ok1 || !ok2 {
dst = append(dst, s[0], s[1])
} else {
ch := (hi << 4) | lo
dst = append(dst, ch)
}
s = s[2:]
}
return append(dst, s...)
}
func appendBase64Encode(dst []byte, s string) []byte {
return base64.StdEncoding.AppendEncode(dst, bytesutil.ToUnsafeBytes(s))
}
func appendBase64Decode(dst []byte, s string) ([]byte, bool) {
result, err := base64.StdEncoding.AppendDecode(dst, bytesutil.ToUnsafeBytes(s))
if err != nil {
return dst, false
}
return result, true
}