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workers.go
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workers.go
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package processor
import (
"crypto/md5"
"fmt"
"hash"
"io/ioutil"
"sort"
"strings"
"sync"
"sync/atomic"
)
// The below are used as identifiers for the code state machine
const (
SBlank int64 = 1
SCode int64 = 2
SComment int64 = 3
SCommentCode int64 = 4 // Indicates comment after code
SMulticomment int64 = 5
SMulticommentCode int64 = 6 // Indicates multi comment after code
SMulticommentBlank int64 = 7 // Indicates multi comment ended with blank afterwards
SString int64 = 8
)
// LineType what type of line are are processing
type LineType int32
// These are not meant to be CAMEL_CASE but as it us used by an external project we cannot change it
const (
LINE_BLANK LineType = iota
LINE_CODE
LINE_COMMENT
)
func checkForMatchSingle(currentByte byte, index int, endPoint int, matches []byte, fileJob *FileJob) bool {
potentialMatch := true
if currentByte == matches[0] {
for j := 0; j < len(matches); j++ {
if index+j >= endPoint || matches[j] != fileJob.Content[index+j] {
potentialMatch = false
break
}
}
if potentialMatch {
return true
}
}
return false
}
func isWhitespace(currentByte byte) bool {
if currentByte != ' ' && currentByte != '\t' && currentByte != '\n' && currentByte != '\r' {
return false
}
return true
}
// Check if this file is binary by checking for nul byte and if so bail out
// this is how GNU Grep, git and ripgrep check for binary files
func isBinary(index int, currentByte byte) bool {
if index < 10000 && !DisableCheckBinary && currentByte == 0 {
return true
}
return false
}
func shouldProcess(currentByte, processBytesMask byte) bool {
if currentByte&processBytesMask != currentByte {
return false
}
return true
}
func resetState(currentState int64) int64 {
if currentState == SMulticomment || currentState == SMulticommentCode {
currentState = SMulticomment
} else if currentState == SString {
currentState = SString
} else {
currentState = SBlank
}
return currentState
}
func stringState(fileJob *FileJob, index int, endPoint int, stringTrie *Trie, endString []byte, currentState int64) (int, int64) {
// Its not possible to enter this state without checking at least 1 byte so it is safe to check -1 here
// without checking if it is out of bounds first
for i := index; i < endPoint; i++ {
index = i
if fileJob.Content[i] == '\n' {
return i, currentState
}
if fileJob.Content[i-1] != '\\' {
if ok, _, _ := stringTrie.Match(fileJob.Content[i:]); ok != 0 {
return i, SCode
}
}
}
return index, currentState
}
func codeState(
fileJob *FileJob,
index int,
endPoint int,
currentState int64,
endString []byte,
endComments [][]byte,
langFeatures LanguageFeature,
digest *hash.Hash,
) (int, int64, []byte, [][]byte) {
for i := index; i < endPoint; i++ {
curByte := fileJob.Content[i]
index = i
if curByte == '\n' {
return i, currentState, endString, endComments
}
if isBinary(i, curByte) {
fileJob.Binary = true
return i, currentState, endString, endComments
}
if shouldProcess(curByte, langFeatures.ProcessMask) {
if Duplicates {
// Technically this is wrong because we skip bytes so this is not a true
// hash of the file contents, but for duplicate files it shouldn't matter
// as both will skip the same way
digestible := []byte{fileJob.Content[index]}
(*digest).Write(digestible)
}
switch tokenType, offsetJump, endString := langFeatures.Tokens.Match(fileJob.Content[i:]); tokenType {
case TString:
currentState = SString
return i, currentState, endString, endComments
case TSlcomment:
currentState = SCommentCode
return i, currentState, endString, endComments
case TMlcomment:
if langFeatures.Nested || len(endComments) == 0 {
endComments = append(endComments, endString)
currentState = SMulticommentCode
i += offsetJump - 1
return i, currentState, endString, endComments
}
case TComplexity:
if index == 0 || isWhitespace(fileJob.Content[index-1]) {
fileJob.Complexity++
}
}
}
}
return index, currentState, endString, endComments
}
func commentState(fileJob *FileJob, index int, endPoint int, currentState int64, endComments [][]byte, endString []byte, langFeatures LanguageFeature) (int, int64, []byte, [][]byte) {
for i := index; i < endPoint; i++ {
curByte := fileJob.Content[i]
index = i
if curByte == '\n' {
return i, currentState, endString, endComments
}
if checkForMatchSingle(curByte, index, endPoint, endComments[len(endComments)-1], fileJob) {
// set offset jump here
offsetJump := len(endComments[len(endComments)-1])
endComments = endComments[:len(endComments)-1]
if len(endComments) == 0 {
// If we started as multiline code switch back to code so we count correctly
// IE i := 1 /* for the lols */
// TODO is that required? Might still be required to count correctly
if currentState == SMulticommentCode {
currentState = SCode // TODO pointless to change here, just set S_MULTICOMMENT_BLANK
} else {
currentState = SMulticommentBlank
}
}
i += offsetJump - 1
return i, currentState, endString, endComments
}
// Check if we are entering another multiline comment
// This should come below check for match single as it speeds up processing
if langFeatures.Nested || len(endComments) == 0 {
if ok, offsetJump, endString := langFeatures.MultiLineComments.Match(fileJob.Content[i:]); ok != 0 {
endComments = append(endComments, endString)
i += offsetJump - 1
return i, currentState, endString, endComments
}
}
}
return index, currentState, endString, endComments
}
func blankState(
fileJob *FileJob,
index int,
endPoint int,
currentState int64,
endComments [][]byte,
endString []byte,
langFeatures LanguageFeature,
) (int, int64, []byte, [][]byte) {
switch tokenType, offsetJump, endString := langFeatures.Tokens.Match(fileJob.Content[index:]); tokenType {
case TMlcomment:
if langFeatures.Nested || len(endComments) == 0 {
endComments = append(endComments, endString)
currentState = SMulticomment
index += offsetJump - 1
return index, currentState, endString, endComments
}
case TSlcomment:
currentState = SComment
return index, currentState, endString, endComments
case TString:
currentState = SString
return index, currentState, endString, endComments
case TComplexity:
currentState = SCode
if index == 0 || isWhitespace(fileJob.Content[index-1]) {
fileJob.Complexity++
}
default:
currentState = SCode
}
return index, currentState, endString, endComments
}
// CountStats will process the fileJob
// If the file contains anything even just a newline its line count should be >= 1.
// If the file has a size of 0 its line count should be 0.
// Newlines belong to the line they started on so a file of \n means only 1 line
// This is the 'hot' path for the application and needs to be as fast as possible
func CountStats(fileJob *FileJob) {
// Needs to always run to ensure the language is set
determineLanguage(fileJob)
// If the file has a length of 0 it is is empty then we say it has no lines
fileJob.Bytes = int64(len(fileJob.Content))
if fileJob.Bytes == 0 {
fileJob.Lines = 0
return
}
LanguageFeaturesMutex.Lock()
langFeatures := LanguageFeatures[fileJob.Language]
LanguageFeaturesMutex.Unlock()
if langFeatures.Complexity == nil {
langFeatures.Complexity = &Trie{}
}
if langFeatures.SingleLineComments == nil {
langFeatures.SingleLineComments = &Trie{}
}
if langFeatures.MultiLineComments == nil {
langFeatures.MultiLineComments = &Trie{}
}
if langFeatures.Strings == nil {
langFeatures.Strings = &Trie{}
}
if langFeatures.Tokens == nil {
langFeatures.Tokens = &Trie{}
}
endPoint := int(fileJob.Bytes - 1)
currentState := SBlank
endComments := [][]byte{}
endString := []byte{}
// For determining duplicates we need the below. The reason for creating
// the byte array here is to avoid GC pressure. MD5 is in the standard library
// and is fast enough to not warrant murmur3 hashing. No need to be
// crypto secure here either so no need to eat the performance cost of a better
// hash method
var digest hash.Hash
if Duplicates {
digest = md5.New()
}
for index := 0; index < len(fileJob.Content); index++ {
// Based on our current state determine if the state should change by checking
// what the character is. The below is very CPU bound so need to be careful if
// changing anything in here and profile/measure afterwards!
// NB that the order of the if statements matters and has been set to what in benchmarks is most efficient
if !isWhitespace(fileJob.Content[index]) {
switch currentState {
case SCode:
index, currentState, endString, endComments = codeState(
fileJob,
index,
endPoint,
currentState,
endString,
endComments,
langFeatures,
&digest,
)
case SString:
index, currentState = stringState(fileJob, index, endPoint, langFeatures.Strings, endString, currentState)
case SMulticomment, SMulticommentCode:
index, currentState, endString, endComments = commentState(
fileJob,
index,
endPoint,
currentState,
endComments,
endString,
langFeatures,
)
case SBlank, SMulticommentBlank:
// From blank we can move into comment, move into a multiline comment
// or move into code but we can only do one.
index, currentState, endString, endComments = blankState(
fileJob,
index,
endPoint,
currentState,
endComments,
endString,
langFeatures,
)
}
}
// Only check the first 10000 characters for null bytes indicating a binary file
// and if we find it then we return otherwise carry on and ignore binary markers
if index < 10000 && fileJob.Binary {
return
}
// This means the end of processing the line so calculate the stats according to what state
// we are currently in
if fileJob.Content[index] == '\n' || index >= endPoint {
fileJob.Lines++
if Trace {
printTrace(fmt.Sprintf("%s line %d ended with state: %d", fileJob.Location, fileJob.Lines, currentState))
}
switch currentState {
case SCode, SString, SCommentCode, SMulticommentCode:
fileJob.Code++
currentState = resetState(currentState)
if fileJob.Callback != nil {
if !fileJob.Callback.ProcessLine(fileJob, fileJob.Lines, LINE_CODE) {
return
}
}
case SComment, SMulticomment, SMulticommentBlank:
fileJob.Comment++
currentState = resetState(currentState)
if fileJob.Callback != nil {
if !fileJob.Callback.ProcessLine(fileJob, fileJob.Lines, LINE_COMMENT) {
return
}
}
case SBlank:
fileJob.Blank++
if fileJob.Callback != nil {
if !fileJob.Callback.ProcessLine(fileJob, fileJob.Lines, LINE_BLANK) {
return
}
}
}
}
}
if Duplicates {
fileJob.Hash = digest.Sum(nil)
}
// Save memory by unsetting the content as we no longer require it
fileJob.Content = nil
}
type languageGuess struct {
Name string
Count int
}
// Given a filejob which could have multiple language types make a guess to the type
// based on keywords supplied, which is similar to how https://github.com/vmchale/polyglot does it
// If however there is only a single language we
func determineLanguage(fileJob *FileJob) {
// If being called through an API its possible nothing is set here and as
// such should just return as the Language value should have already been set
if len(fileJob.PossibleLanguages) == 0 {
return
}
// There should only be two possibilities now, either we have a single language
// in which case we set it and return
// or we have multiple in which case we try to determine it heuristically
if len(fileJob.PossibleLanguages) == 1 {
fileJob.Language = fileJob.PossibleLanguages[0]
return
}
startTime := makeTimestampNano()
var toCheck string
if len(fileJob.Content) > 2000 {
toCheck = string(fileJob.Content)[:2000]
} else {
toCheck = string(fileJob.Content)
}
toSort := []languageGuess{}
for _, lan := range fileJob.PossibleLanguages {
LanguageFeaturesMutex.Lock()
langFeatures := LanguageFeatures[lan]
LanguageFeaturesMutex.Unlock()
count := 0
for _, key := range langFeatures.Keywords {
if strings.Contains(toCheck, key) {
fileJob.Language = lan
count++
}
}
toSort = append(toSort, languageGuess{Name: lan, Count: count})
}
sort.Slice(toSort, func(i, j int) bool {
return toSort[i].Count > toSort[j].Count
})
if Verbose {
printWarn(fmt.Sprintf("guessing language %s for file %s", toSort[0].Name, fileJob.Filename))
}
if Trace {
printTrace(fmt.Sprintf("nanoseconds to guess language: %s: %d", fileJob.Filename, makeTimestampNano()-startTime))
}
if len(toSort) != 0 {
fileJob.Language = toSort[0].Name
}
}
// Reads entire file into memory and then pushes it onto the next queue
func fileReaderWorker(input chan *FileJob, output chan *FileJob) {
var startTime int64
var wg sync.WaitGroup
for i := 0; i < FileReadJobWorkers; i++ {
wg.Add(1)
go func() {
for res := range input {
atomic.CompareAndSwapInt64(&startTime, 0, makeTimestampMilli())
fileStartTime := makeTimestampNano()
content, err := ioutil.ReadFile(res.Location)
if Trace {
printTrace(fmt.Sprintf("nanoseconds read into memory: %s: %d", res.Location, makeTimestampNano()-fileStartTime))
}
if err == nil {
res.Content = content
output <- res
} else {
if Verbose {
printWarn(fmt.Sprintf("error reading: %s %s", res.Location, err))
}
}
}
wg.Done()
}()
}
go func() {
wg.Wait()
close(output)
if Debug {
printDebug(fmt.Sprintf("milliseconds reading files into memory: %d", makeTimestampMilli()-startTime))
}
}()
}
var duplicates = CheckDuplicates{
hashes: make(map[int64][][]byte),
}
// Does the actual processing of stats and as such contains the hot path CPU call
func fileProcessorWorker(input chan *FileJob, output chan *FileJob) {
var startTime int64
var wg sync.WaitGroup
for i := 0; i < FileProcessJobWorkers; i++ {
wg.Add(1)
go func() {
for res := range input {
atomic.CompareAndSwapInt64(&startTime, 0, makeTimestampMilli())
fileStartTime := makeTimestampNano()
CountStats(res)
if Duplicates {
duplicates.mux.Lock()
if duplicates.Check(res.Bytes, res.Hash) {
if Verbose {
printWarn(fmt.Sprintf("skipping duplicate file: %s", res.Location))
}
duplicates.mux.Unlock()
continue
}
duplicates.Add(res.Bytes, res.Hash)
duplicates.mux.Unlock()
}
if Trace {
printTrace(fmt.Sprintf("nanoseconds process: %s: %d", res.Location, makeTimestampNano()-fileStartTime))
}
if !res.Binary {
output <- res
} else {
if Verbose {
printWarn(fmt.Sprintf("skipping file identified as binary: %s", res.Location))
}
}
}
wg.Done()
}()
}
go func() {
wg.Wait()
close(output)
}()
if Debug {
printDebug(fmt.Sprintf("milliseconds processing files: %d", makeTimestampMilli()-startTime))
}
}