-
-
Notifications
You must be signed in to change notification settings - Fork 252
/
workers.go
418 lines (353 loc) · 12.1 KB
/
workers.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
package processor
import (
"crypto/md5"
"fmt"
"io/ioutil"
"sync"
)
const (
S_BLANK int64 = 1
S_CODE int64 = 2
S_COMMENT int64 = 3
S_COMMENT_CODE int64 = 4 // Indicates comment after code
S_MULTICOMMENT int64 = 5
S_MULTICOMMENT_CODE int64 = 6 // Indicates multi comment after code
S_MULTICOMMENT_BLANK int64 = 7 // Indicates multi comment ended with blank afterwards
S_STRING int64 = 8
)
func checkForMatch(currentByte byte, index int, endPoint int, matches [][]byte, fileJob *FileJob) bool {
potentialMatch := true
for i := 0; i < len(matches); i++ {
if currentByte == matches[i][0] {
for j := 0; j < len(matches[i]); j++ {
if index+j >= endPoint || matches[i][j] != fileJob.Content[index+j] {
potentialMatch = false
break
}
}
if potentialMatch {
return true
}
}
}
return false
}
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 checkForMatchMultiOpen(currentByte byte, index int, endPoint int, matches []OpenClose, fileJob *FileJob) (int, []byte) {
potentialMatch := true
for i := 0; i < len(matches); i++ {
if currentByte == matches[i].Open[0] {
potentialMatch = true
for j := 1; j < len(matches[i].Open); j++ {
if index+j > endPoint || matches[i].Open[j] != fileJob.Content[index+j] {
potentialMatch = false
break
}
}
if potentialMatch {
return len(matches[i].Open), matches[i].Close
}
}
}
return 0, nil
}
func checkForMatchMultiClose(currentByte byte, index int, endPoint int, matches []OpenClose, fileJob *FileJob) int {
potentialMatch := true
for i := 0; i < len(matches); i++ {
if currentByte == matches[i].Close[0] {
potentialMatch = true
for j := 1; j < len(matches[i].Close); j++ {
if index+j > endPoint || matches[i].Close[j] != fileJob.Content[index+j] {
potentialMatch = false
break
}
}
if potentialMatch {
return len(matches[i].Close)
}
}
}
return 0
}
// What I want to know is given a list of strings and a current position are any
// of them there starting from where we check, and if yes say so
func checkComplexity(currentByte byte, index int, endPoint int, matches [][]byte, fileJob *FileJob) int {
// Special case if the thing we are matching is not the first thing in the file
// then we need to check that there was a whitespace before it
if index != 0 {
// If the byte before our current postion is not a whitespace then return false
if fileJob.Content[index-1] != ' ' && fileJob.Content[index-1] != '\t' && fileJob.Content[index-1] != '\n' && fileJob.Content[index-1] != '\r' {
return 0
}
}
// Because the number of complexity checks is usually quite high this check speeds
// up the processing quite a lot and is worth implementing
// NB this allocation is much cheaper than refering to things directly
complexityBytes := LanguageFeatures[fileJob.Language].ComplexityBytes
hasMatch := false
for i := 0; i < len(complexityBytes); i++ {
if complexityBytes[i] == currentByte {
hasMatch = true
break
}
}
if !hasMatch {
return 0
}
potentialMatch := true
for i := 0; i < len(matches); i++ { // Loop each match
if currentByte == matches[i][0] { // If the first byte of the match is not the current byte skip
potentialMatch = true
// Assume that we have a match and then see if we don't
// Start from 1 as we already checked the first byte for a match
for j := 1; j < len(matches[i]); j++ {
// Bounds check first and if that is ok check if the bytes match
if index+j > endPoint || matches[i][j] != fileJob.Content[index+j] {
potentialMatch = false
break
}
}
// Return the length of match and use that to step past the bytes we just checked
if potentialMatch {
return len(matches[i])
}
}
}
return 0
}
func isWhitespace(currentByte byte) bool {
if currentByte != ' ' && currentByte != '\t' && currentByte != '\n' && currentByte != '\r' {
return false
}
return true
}
// 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) {
// 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
}
complexityChecks := LanguageFeatures[fileJob.Language].ComplexityChecks
singleLineCommentChecks := LanguageFeatures[fileJob.Language].SingleLineComment
multiLineCommentChecks := LanguageFeatures[fileJob.Language].MultiLineComment
stringChecks := LanguageFeatures[fileJob.Language].StringChecks
endPoint := int(fileJob.Bytes - 1)
currentState := S_BLANK
endString := []byte{}
// If we have checked bytes ahead of where we are we can jump ahead and save time
// this value stores that jump
offsetJump := 0
// 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 warrent murmur3 hashing. No need to be
// crypto secure here either so no need to eat the performance cost of a better
// hash method
digest := md5.New()
digestable := []byte{' '}
for index := 0; index < len(fileJob.Content); index++ {
offsetJump = 0
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
digestable[0] = fileJob.Content[index]
digest.Write(digestable)
}
// 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!
state:
switch {
case currentState == S_BLANK || currentState == S_MULTICOMMENT_BLANK:
// From blank we can move into comment, move into a multiline comment
// or move into code but we can only do one.
if checkForMatch(fileJob.Content[index], index, endPoint, singleLineCommentChecks, fileJob) {
currentState = S_COMMENT
break state
}
offsetJump, endString = checkForMatchMultiOpen(fileJob.Content[index], index, endPoint, multiLineCommentChecks, fileJob)
if offsetJump != 0 {
currentState = S_MULTICOMMENT
break state
}
offsetJump, endString = checkForMatchMultiOpen(fileJob.Content[index], index, endPoint, stringChecks, fileJob)
if offsetJump != 0 {
currentState = S_STRING
break state
}
if !isWhitespace(fileJob.Content[index]) {
currentState = S_CODE
if !Complexity {
offsetJump = checkComplexity(fileJob.Content[index], index, endPoint, complexityChecks, fileJob)
if offsetJump != 0 {
fileJob.Complexity++
}
}
break state
}
case currentState == S_CODE:
// From code we can move into a multiline comment or string
offsetJump, endString = checkForMatchMultiOpen(fileJob.Content[index], index, endPoint, multiLineCommentChecks, fileJob)
if offsetJump != 0 {
currentState = S_MULTICOMMENT_CODE
break state
}
offsetJump, endString = checkForMatchMultiOpen(fileJob.Content[index], index, endPoint, stringChecks, fileJob)
if offsetJump != 0 {
currentState = S_STRING
break state
} else {
if !Complexity {
offsetJump = checkComplexity(fileJob.Content[index], index, endPoint, complexityChecks, fileJob)
if offsetJump != 0 {
fileJob.Complexity++
}
}
break state
}
case currentState == S_STRING:
// 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
if fileJob.Content[index-1] != '\\' && checkForMatchSingle(fileJob.Content[index], index, endPoint, endString, fileJob) {
currentState = S_CODE
}
break state
case currentState == S_MULTICOMMENT || currentState == S_MULTICOMMENT_CODE:
offsetJump = checkForMatchMultiClose(fileJob.Content[index], index, endPoint, multiLineCommentChecks, fileJob)
if offsetJump != 0 {
// If we started as multiline code switch back to code so we count correctly
if currentState == S_MULTICOMMENT_CODE {
currentState = S_CODE
} else {
// If we are the end of the file OR next byte is whitespace move to comment blank
if index+offsetJump >= endPoint || isWhitespace(fileJob.Content[index+offsetJump]) {
currentState = S_MULTICOMMENT_BLANK
} else {
currentState = S_MULTICOMMENT_CODE
}
}
}
}
// 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 || index+offsetJump > endPoint {
fileJob.Lines++
if Trace {
printTrace(fmt.Sprintf("%s line %d ended with state: %d", fileJob.Location, fileJob.Lines, currentState))
}
switch {
case currentState == S_BLANK:
fileJob.Blank++
case currentState == S_CODE || currentState == S_STRING || currentState == S_COMMENT_CODE || currentState == S_MULTICOMMENT_CODE:
fileJob.Code++
case currentState == S_COMMENT || currentState == S_MULTICOMMENT || currentState == S_MULTICOMMENT_BLANK:
fileJob.Comment++
}
// If we are in a multiline comment that started after some code then we need
// to move to a multiline comment if a multiline comment then stay there
// otherwise we reset back into a blank state
if currentState != S_MULTICOMMENT && currentState != S_MULTICOMMENT_CODE {
currentState = S_BLANK
} else {
currentState = S_MULTICOMMENT
}
}
// If we checked ahead on bytes we are able to jump ahead and save some time reprocessing
// the same values again
index += offsetJump
}
if Duplicates {
hashed := make([]byte, 0)
fileJob.Hash = digest.Sum(hashed)
}
// Save memory by unsetting the content as we no longer require it
fileJob.Content = []byte{}
}
// Reads entire file into memory and then pushes it onto the next queue
func fileReaderWorker(input *chan *FileJob, output *chan *FileJob) {
startTime := makeTimestampMilli()
var wg sync.WaitGroup
for res := range *input {
wg.Add(1)
go func(res *FileJob) {
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()
}(res)
}
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) {
startTime := makeTimestampMilli()
var wg sync.WaitGroup
for res := range *input {
wg.Add(1)
go func(res *FileJob) {
fileStartTime := makeTimestampNano()
countStats(res)
if Duplicates {
if duplicates.Check(res.Bytes, res.Hash) {
if Verbose {
printWarn(fmt.Sprintf("skipping duplicate file: %s", res.Location))
}
wg.Done()
return
} else {
duplicates.Add(res.Bytes, res.Hash)
}
}
if Trace {
printTrace(fmt.Sprintf("nanoseconds process: %s: %d", res.Location, makeTimestampNano()-fileStartTime))
}
*output <- res
wg.Done()
}(res)
}
go func() {
wg.Wait()
close(*output)
}()
if Debug {
printDebug(fmt.Sprintf("milliseconds proessing files: %d", makeTimestampMilli()-startTime))
}
}