func normalizePath(dst, src []byte) []byte {
dst = dst[:0]
dst = addLeadingSlash(dst, src)
dst = decodeArgAppend(dst, src, false)
// remove duplicate slashes
b := dst
bSize := len(b)
for {
n := bytes.Index(b, strSlashSlash)
if n < 0 {
break
}
b = b[n:]
copy(b, b[1:])
b = b[:len(b)-1]
bSize--
}
dst = dst[:bSize]
// remove /./ parts
b = dst
for {
n := bytes.Index(b, strSlashDotSlash)
if n < 0 {
break
}
nn := n + len(strSlashDotSlash) - 1
copy(b[n:], b[nn:])
b = b[:len(b)-nn+n]
}
// remove /foo/../ parts
for {
n := bytes.Index(b, strSlashDotDotSlash)
if n < 0 {
break
}
nn := bytes.LastIndexByte(b[:n], '/')
if nn < 0 {
nn = 0
}
n += len(strSlashDotDotSlash) - 1
copy(b[nn:], b[n:])
b = b[:len(b)-n+nn]
}
// remove trailing /foo/..
n := bytes.LastIndex(b, strSlashDotDot)
if n >= 0 && n+len(strSlashDotDot) == len(b) {
nn := bytes.LastIndexByte(b[:n], '/')
if nn < 0 {
return strSlash
}
b = b[:nn+1]
}
return b
}
func parseFolders(data []byte) (Folders, error) {
var (
idx int
folders Folders
)
idx = bytes.IndexByte(data, '{')
if idx < 0 {
return nil, errors.New("invalid folders data")
}
data = data[idx:]
idx = bytes.LastIndexByte(data, '}')
if idx < 0 {
return nil, errors.New("invalid folders data")
}
data = data[:idx+1]
err := json.Unmarshal(data, &folders)
if err != nil {
return nil, err
}
return folders, nil
}
func (c *Client) LineBufferComplete(autoComplete string, attach bool) {
defer c.mutex.Unlock()
c.mutex.Lock()
buf := c.telnetLine
if !attach {
// overwrite current label
spc := bytes.LastIndexByte(buf.lineBuf[:buf.linePos], ' ')
buf.lineSize = spc + 1
}
// append label
for _, b := range autoComplete {
if buf.lineSize >= len(buf.lineBuf) {
break // overflow
}
// copy byte
buf.lineBuf[buf.lineSize] = byte(b)
buf.lineSize++
}
buf.linePos = buf.lineSize
}
func parseBand(data []byte) (Band, error) {
var (
idx int
band Band
)
idx = bytes.IndexByte(data, '{')
if idx < 0 {
return nil, errors.New("invalid band data")
}
data = data[idx:]
idx = bytes.LastIndexByte(data, '}')
if idx < 0 {
return nil, errors.New("invalid band data")
}
data = data[:idx+1]
err := json.Unmarshal(data, &band)
if err != nil {
return nil, err
}
return band, nil
}
func parseProfile(data []byte) (*Profile, error) {
var (
idx int
profile *Profile
)
idx = bytes.IndexByte(data, '{')
if idx < 0 {
return nil, errors.New("invalid profile data")
}
data = data[idx:]
idx = bytes.LastIndexByte(data, '}')
if idx < 0 {
return nil, errors.New("invalid profile data")
}
data = data[:idx+1]
err := json.Unmarshal(data, &profile)
if err != nil {
return nil, err
}
return profile, nil
}
// Write ...
func (w *headerWriter) Write(p []byte) (int, error) {
// TODO: logic for wrapping headers is actually pretty complex for some header types, like received headers
var total int
for len(p)+w.curLineLen > w.maxLineLen {
toWrite := w.maxLineLen - w.curLineLen
// Wrap at last space, if any
lastSpace := bytes.LastIndexByte(p[:toWrite], byte(' '))
if lastSpace > 0 {
toWrite = lastSpace
}
written, err := w.w.Write(p[:toWrite])
total += written
if err != nil {
return total, err
}
written, err = w.w.Write([]byte("\r\n "))
total += written
if err != nil {
return total, err
}
p = p[toWrite:]
w.curLineLen = 1 // Continuation lines are indented
}
written, err := w.w.Write(p)
total += written
w.curLineLen += written
return total, err
}
func (h *RequestHeader) parseFirstLine(buf []byte) (int, error) {
bNext := buf
var b []byte
var err error
for len(b) == 0 {
if b, bNext, err = nextLine(bNext); err != nil {
return 0, err
}
}
// parse method
n := bytes.IndexByte(b, ' ')
if n <= 0 {
return 0, fmt.Errorf("cannot find http request method in %q", buf)
}
h.method = append(h.method[:0], b[:n]...)
b = b[n+1:]
// parse requestURI
n = bytes.LastIndexByte(b, ' ')
if n < 0 {
h.noHTTP11 = true
n = len(b)
} else if n == 0 {
return 0, fmt.Errorf("RequestURI cannot be empty in %q", buf)
} else if !bytes.Equal(b[n+1:], strHTTP11) {
h.noHTTP11 = true
}
h.requestURI = append(h.requestURI[:0], b[:n]...)
return len(buf) - len(bNext), nil
}
// LastPathSegment returns the last part of uri path after '/'.
//
// Examples:
//
// * For /foo/bar/baz.html path returns baz.html.
// * For /foo/bar/ returns empty byte slice.
// * For /foobar.js returns foobar.js.
func (x *URI) LastPathSegment() []byte {
path := x.Path()
n := bytes.LastIndexByte(path, '/')
if n < 0 {
return path
}
return path[n+1:]
}
func getOffsetXLineBack(contents []byte, lines int64) (offset int64) {
for offset = int64(len(contents)); offset != -1 && lines > 0; lines-- {
offset = int64(bytes.LastIndexByte(contents[:offset], newline))
}
if offset == -1 {
offset = 0
}
return
}
// Open opens the file at path for writing in append mode. If it does
// not exist it is created with permissions of perm.
//
// The returned WriteCloser keeps track of the size of the file and
// the position of the most recent newline. If during a call to Write
// a particular byte to be written would cause the file size to exceed
// maxSize bytes, and at least one newline has been written to the
// file already, then a rotation occurs before the byte is written. A
// rotation is the following procedure:
//
// Let N = highest n such that <path>.<n>.gz exists or zero
// otherwise. Let M = maxFiles. Starting at n = N, while n > M-2 and n
// > 0 delete <path>.<n>.gz and decrement n. Then, while n > 0, rename
// <path>.<n>.gz to <path>.<n+1>.gz and decrement n. Next, if M > 1,
// the contents of <path> up to and including the final newline are
// gzipped and saved to the file <path>.1.gz . Lastly, the contents of
// <path> beyond the final newline are copied to the beginning of the
// file and <path> is truncated to contain just those contents.
//
// It is safe to call Write/Close from multiple goroutines.
func Open(path string, perm os.FileMode, maxSize int64, maxFiles int) (io.WriteCloser, error) {
if maxSize < 1 {
return nil, errors.New("logrot: maxSize < 1")
}
if maxFiles < 1 {
return nil, errors.New("logrot: maxFiles < 1")
}
// if path exists determine size and check path is a regular file.
var size int64
fi, err := os.Lstat(path)
if err != nil && !os.IsNotExist(err) {
return nil, err
}
if err == nil {
if fi.Mode()&os.ModeType != 0 {
return nil, fmt.Errorf("logrot: %s is not a regular file", path)
}
size = fi.Size()
}
// open path for reading/writing, creating it if necessary.
file, err := os.OpenFile(path, os.O_RDWR|os.O_CREATE, perm)
if err != nil {
return nil, err
}
// determine last newline position within file by reading backwards.
var lastNewline int64 = -1
const bufExp = 13 // 8KB buffer
buf := make([]byte, 1<<bufExp)
off := ((size - 1) >> bufExp) << bufExp
bufSz := size - off
for off >= 0 {
_, err = file.ReadAt(buf[:bufSz], off)
if err != nil {
_ = file.Close()
return nil, err
}
i := bytes.LastIndexByte(buf[:bufSz], '\n')
if i != -1 {
lastNewline = off + int64(i)
break
}
off -= 1 << bufExp
bufSz = 1 << bufExp
}
return &writeCloser{
path: path,
perm: perm,
maxSize: maxSize,
maxFiles: maxFiles,
file: file,
size: size,
lastNewline: lastNewline,
}, nil
}
func parseNetstatLine(line [][]byte) (port, pid int, err error) {
n := bytes.LastIndexByte(line[1], ':')
if n < 0 {
return port, pid, errors.New("parsing port")
}
port, err = strconv.Atoi(string(line[1][n+1:]))
if err != nil {
return
}
pid, err = strconv.Atoi(string(line[4]))
return
}
func (u *URI) updateBytes(newURI, buf []byte) []byte {
if len(newURI) == 0 {
return buf
}
n := bytes.Index(newURI, strSlashSlash)
if n >= 0 {
// absolute uri
var b [32]byte
schemeOriginal := b[:0]
if len(u.scheme) > 0 {
schemeOriginal = append([]byte(nil), u.scheme...)
}
u.Parse(nil, newURI)
if len(schemeOriginal) > 0 && len(u.scheme) == 0 {
u.scheme = append(u.scheme[:0], schemeOriginal...)
}
return buf
}
if newURI[0] == '/' {
// uri without host
buf = u.appendSchemeHost(buf[:0])
buf = append(buf, newURI...)
u.Parse(nil, buf)
return buf
}
// relative path
switch newURI[0] {
case '?':
// query string only update
u.SetQueryStringBytes(newURI[1:])
return append(buf[:0], u.FullURI()...)
case '#':
// update only hash
u.SetHashBytes(newURI[1:])
return append(buf[:0], u.FullURI()...)
default:
// update the last path part after the slash
path := u.Path()
n = bytes.LastIndexByte(path, '/')
if n < 0 {
panic("BUG: path must contain at least one slash")
}
buf = u.appendSchemeHost(buf[:0])
buf = appendQuotedPath(buf, path[:n+1])
buf = append(buf, newURI...)
u.Parse(nil, buf)
return buf
}
}
func json2Filef(url string, save_to string, maxPage string) (int, error) {
//fmt.Println(url, maxPage)
for {
ll = append(ll, time.Now())
statusCode, body, err := fasthttp.Get(nil, url)
if err != nil {
return 0, err
}
if 200 != statusCode {
return 0, fmt.Errorf("!200")
}
anti_spider := "smPolicy=tmallrateweb-rate-anti_Spider-checklogin"
idx_anti_spider := bytes.Index(body, []byte(anti_spider))
paginator_empty := "\"paginator\":\"\""
idx_paginator_empty := bytes.Index(body, []byte(paginator_empty))
if idx_anti_spider >= 0 || idx_paginator_empty >= 0 {
time.Sleep(5 * time.Second)
continue
}
out := make([]byte, len(body)*2)
_, bytesWritten, err := iconv.Convert(body, out, "gbk", "utf-8")
//fmt.Println(bytesRead, bytesWritten, err)
idx := bytes.IndexByte(out, '(')
if idx < 0 || bytesWritten < idx+1 {
return 0, fmt.Errorf("idx error")
}
out = out[idx+1 : bytesWritten]
//fmt.Println(string(out))
idx_end := bytes.LastIndexByte(out, ')')
if idx_end < 0 {
return 0, fmt.Errorf("idx_end<0, )")
}
out = out[:idx_end]
fmt.Println(save_to)
ioutil.WriteFile(save_to, out, 0666)
time.Sleep(1 * time.Second)
if len(maxPage) > 0 {
return strconv.Atoi(pickString(body, maxPage, ":", ","))
} else {
return 0, nil
}
}
}
func json2Filef(t *ShopType, sellerId, itemId string) (int, error) {
if ex := os.MkdirAll(fmt.Sprintf("%s/%s/%s/%s", root, t.Type, sellerId, itemId), 0777); ex != nil {
fmt.Println(ex)
return 0, ex
}
for p, max := 1, 1; p <= max; {
url := fmt.Sprintf(t.RateFormat, itemId, sellerId, p)
// fmt.Println(url)
if body, ok := fetchData(url); ok {
if len(body) < 100 {
if "jsonp({\"status\":1111,\"wait\":5})" == string(body) {
time.Sleep(5 * time.Minute)
}
}
if p == 1 {
lastPage := pickString(body, "\"lastPage\":", ",\"page\"")
fmt.Println("lastPage", lastPage)
if v_max, err := strconv.Atoi(lastPage); err == nil {
max = v_max
} else {
fmt.Println(err)
}
}
out := make([]byte, len(body)*2)
_, bytesWritten, _ := iconv.Convert(body, out, "gbk", "utf-8")
idx := bytes.IndexByte(out, '(')
if idx < 0 || bytesWritten < idx+1 {
return 0, fmt.Errorf("idx error")
}
out = out[idx+1 : bytesWritten]
idx_end := bytes.LastIndexByte(out, ')')
if idx_end < 0 {
return 0, fmt.Errorf("idx_end<0, )")
}
out = out[:idx_end]
save_to := fmt.Sprintf("%s/%s/%s/%s/%s.%d.log", root, t.Type, sellerId, itemId, itemId, p)
fmt.Printf("%s %d/%d [%d]\n%s\n", url, p, max, len(out), save_to)
ioutil.WriteFile(save_to, out, 0666)
time.Sleep(time.Duration(rand.Intn(5)) * time.Second)
p++
}
}
return 0, nil
}
// NewFromBytes returns a new scanner lexing from input.
func NewFromBytes(input []byte) Scanner {
// Append new line to files not ending with new line.
appendNewLine := false
lastNewLine := bytes.LastIndexByte(input, '\n')
for _, r := range string(input[lastNewLine+1:]) {
if !strings.ContainsRune(whitespace, r) {
// Non-whitespace character located after the last new line character.
appendNewLine = true
break
}
}
if appendNewLine {
input = append(input, '\n')
}
return lexer.NewLexer(input)
}
func expectEcho(match string, immed bool, flusher func(string)) (string, bool) {
var collected []byte
for {
data := readWithTimeout()
collected = append(collected, data...)
if bytes.HasSuffix(collected, []byte(match)) {
bytesBefore := len(collected) - len(match)
return string(collected[:bytesBefore]), true
}
if immed || len(data) == 0 {
return string(collected), false
}
if n := bytes.LastIndexByte(collected, '\n'); n >= 0 {
flusher(string(collected[:n+1]))
collected = collected[n+1:]
}
}
}
func lastIndexLines(s []byte, n *int) int64 {
i := len(s) - 1
for i > 0 {
o := bytes.LastIndexByte(s[:i], '\n')
if o < 0 {
break
}
i = o
*n--
if *n == 0 {
break
}
}
return int64(i)
}
func (merger *OutputMerger) Add(name string, r io.ReadCloser) {
merger.wg.Add(1)
go func() {
var pending []byte
var buf [4 << 10]byte
for {
n, err := r.Read(buf[:])
if n != 0 {
pending = append(pending, buf[:n]...)
if pos := bytes.LastIndexByte(pending, '\n'); pos != -1 {
out := pending[:pos+1]
if merger.tee != nil {
merger.tee.Write(out)
}
select {
case merger.Output <- append([]byte{}, out...):
r := copy(pending[:], pending[pos+1:])
pending = pending[:r]
default:
}
}
}
if err != nil {
if len(pending) != 0 {
pending = append(pending, '\n')
if merger.tee != nil {
merger.tee.Write(pending)
}
select {
case merger.Output <- pending:
default:
}
}
r.Close()
select {
case merger.Err <- fmt.Errorf("failed to read from %v: %v", name, err):
default:
}
merger.wg.Done()
return
}
}
}()
}
// scanUntilBoundary scans buf to identify how much of it can be safely
// returned as part of the Part body.
// dashBoundary is "--boundary".
// nlDashBoundary is "\r\n--boundary" or "\n--boundary", depending on what mode we are in.
// The comments below (and the name) assume "\n--boundary", but either is accepted.
// total is the number of bytes read out so far. If total == 0, then a leading "--boundary" is recognized.
// readErr is the read error, if any, that followed reading the bytes in buf.
// scanUntilBoundary returns the number of data bytes from buf that can be
// returned as part of the Part body and also the error to return (if any)
// once those data bytes are done.
func scanUntilBoundary(buf, dashBoundary, nlDashBoundary []byte, total int64, readErr error) (int, error) {
if total == 0 {
// At beginning of body, allow dashBoundary.
if bytes.HasPrefix(buf, dashBoundary) {
switch matchAfterPrefix(buf, dashBoundary, readErr) {
case -1:
return len(dashBoundary), nil
case 0:
return 0, nil
case +1:
return 0, io.EOF
}
}
if bytes.HasPrefix(dashBoundary, buf) {
return 0, readErr
}
}
// Search for "\n--boundary".
if i := bytes.Index(buf, nlDashBoundary); i >= 0 {
switch matchAfterPrefix(buf[i:], nlDashBoundary, readErr) {
case -1:
return i + len(nlDashBoundary), nil
case 0:
return i, nil
case +1:
return i, io.EOF
}
}
if bytes.HasPrefix(nlDashBoundary, buf) {
return 0, readErr
}
// Otherwise, anything up to the final \n is not part of the boundary
// and so must be part of the body.
// Also if the section from the final \n onward is not a prefix of the boundary,
// it too must be part of the body.
i := bytes.LastIndexByte(buf, nlDashBoundary[0])
if i >= 0 && bytes.HasPrefix(nlDashBoundary, buf[i:]) {
return i, nil
}
return len(buf), readErr
}
// Find the offset we want to start tailing from.
// This should either be beginning-of-file or tailLines
// newlines from the EOF.
func findSeekPos(f *os.File) int64 {
defer trace.End(trace.Begin(""))
nlines := tailLines
readPos, err := f.Seek(0, 2)
// If for some reason we can't seek, we will just start tailing from beginning-of-file
if err != nil {
return int64(0)
}
// Buffer so we can seek nBytes (default: 1k) at a time
buf := make([]byte, nBytes)
for readPos > 0 {
// Go back nBytes from the last readPos we've seen (stopping at beginning-of-file)
// and read the next nBytes
readPos -= int64(len(buf))
if readPos < 0 {
// We don't want to overlap our read with previous reads...
buf = buf[:(int(readPos) + nBytes)]
readPos = 0
}
bufend, err := f.ReadAt(buf, readPos)
// It's OK to get io.EOF here. Anything else is bad.
if err != nil && err != io.EOF {
log.Errorf("Error reading from file %s: %s", f.Name(), err)
return 0
}
// Start from the end of the buffer and start looking for newlines
for bufend > 0 {
bufend = bytes.LastIndexByte(buf[:bufend], '\n')
if bufend < 0 {
break
}
nlines--
if nlines < 0 {
return readPos + int64(bufend) + 1
}
}
}
return 0
}
func DecodeJsonp(data []byte, value interface{}) (string, error) {
leftIndex := bytes.IndexByte(data, '(')
rightIndex := bytes.LastIndexByte(data, ')')
if leftIndex == -1 || rightIndex == -1 || leftIndex >= rightIndex {
return "", errors.New("invalid jsonp format " + string(data))
}
functionName := string(data[:leftIndex])
data = data[leftIndex+1 : rightIndex]
var valueDynamic interface{}
err := json.Unmarshal(data, &valueDynamic)
if err != nil {
return "", err
}
err = MapToArray(valueDynamic, value, "jsonp")
if err != nil {
return "", err
}
return strings.Trim(functionName, " "), nil
}
func parseResponseStatus(s []byte) (uint16, []byte, error) {
if isDebug {
debugf("parseResponseStatus: %s", s)
}
p := bytes.IndexByte(s, ' ')
if p == -1 {
return 0, nil, errors.New("Not able to identify status code")
}
code, _ := parseInt(s[0:p])
p = bytes.LastIndexByte(s, ' ')
if p == -1 {
return uint16(code), nil, errors.New("Not able to identify status code")
}
phrase := s[p+1:]
return uint16(code), phrase, nil
}
// Refresh reloads all the data associated with this process.
func (p *UnixProcess) Refresh() error {
var (
procPath = fmt.Sprintf("/proc/%d/", p.pid)
data []byte
err error
)
data, err = ioutil.ReadFile(procPath + "stat")
if err != nil {
return err
}
data = data[bytes.IndexRune(data, ')')+2:]
_, err = fmt.Fscanf(bytes.NewReader(data), "%c %d", new(rune), &p.ppid)
if err != nil {
return err
}
data, err = ioutil.ReadFile(procPath + "cmdline")
if err != nil {
return err
}
if len(data) == 0 {
return errors.New("empty name")
}
// Remove arguments
if ind := bytes.IndexByte(data, 0); ind >= 0 {
data = data[:ind]
}
if ind := bytes.IndexByte(data, ' '); ind >= 0 {
data = data[:ind]
}
// Remove path to the executable
if ind := bytes.LastIndexByte(data, '/'); ind >= 0 {
data = data[ind+1:]
}
p.binary = string(data)
return nil
}
func (x *URI) updateBytes(newURI, buf []byte) []byte {
if len(newURI) == 0 {
return buf
}
if newURI[0] == '/' {
// uri without host
buf = x.appendSchemeHost(buf[:0])
buf = append(buf, newURI...)
x.Parse(nil, buf)
return buf
}
n := bytes.Index(newURI, strColonSlashSlash)
if n >= 0 {
// absolute uri
x.Parse(nil, newURI)
return buf
}
// relative path
if newURI[0] == '?' {
// query string only update
x.SetQueryStringBytes(newURI[1:])
return buf
}
path := x.Path()
n = bytes.LastIndexByte(path, '/')
if n < 0 {
panic("BUG: path must contain at least one slash")
}
buf = x.appendSchemeHost(buf[:0])
buf = appendQuotedPath(buf, path[:n+1])
buf = append(buf, newURI...)
x.Parse(nil, buf)
return buf
}
/**
* This is the function that will be called for each match that occurs. @a ctx
* is to allow you to have some application-specific state that you will get
* access to for each match. In our simple example we're just going to use it
* to pass in the pattern that was being searched for so we can print it out.
*/
func eventHandler(id uint, from, to uint64, flags uint, context interface{}) error {
inputData := context.([]byte)
start := bytes.LastIndexByte(inputData[:from], '\n')
end := int(to) + bytes.IndexByte(inputData[to:], '\n')
if start == -1 {
start = 0
} else {
start += 1
}
if end == -1 {
end = len(inputData)
}
if *flagByteOffset {
fmt.Printf("%d: ", start)
}
fmt.Printf("%s%s%s\n", inputData[start:from], theme(string(inputData[from:to])), inputData[to:end])
return nil
}
// must be full lines or we will have a sad time
func (s *Slog) write(msg []byte) {
s.mu.Lock()
defer s.mu.Unlock()
// scan for the last (or any) cuts so we can decide what to do
lastBreak := bytes.LastIndexByte(msg, '\n') + 1
// fmt.Printf("::> %q ; %d/%d <::\n", string(msg), lastBreak, len(msg))
if lastBreak <= 0 {
s.partial.Write(msg)
return
}
// roll back over our previous banner print
s.retract(s.footprint)
// if we have any buffered partial lines, flush that first
if s.partial.Len() > 0 {
io.Copy(s.wr, s.partial)
s.partial.Reset()
}
// now flush all other complete lines
io.Copy(s.wr, bytes.NewBuffer(msg[0:lastBreak]))
// and the banner again
io.Copy(s.wr, bytes.NewBuffer(s.bannerMemo))
// retain anything after lastbreak in the partial line buffer
s.partial.Write(msg[lastBreak:])
}
func (p *Peer) PktProcess(data []byte, tap io.Writer, reorderable bool) bool {
if len(data) < MinPktLength {
return false
}
if !p.Encless && len(data) > len(p.bufR)-S20BS {
return false
}
var out []byte
p.BusyR.Lock()
if p.Encless {
var err error
out, err = EnclessDecode(
p.Key,
data[len(data)-NonceSize:],
data[:len(data)-NonceSize],
)
if err != nil {
p.FramesUnauth++
p.BusyR.Unlock()
return false
}
} else {
for i := 0; i < SSize; i++ {
p.bufR[i] = 0
}
copy(p.bufR[S20BS:], data[TagSize:])
salsa20.XORKeyStream(
p.bufR[:S20BS+len(data)-TagSize-NonceSize],
p.bufR[:S20BS+len(data)-TagSize-NonceSize],
data[len(data)-NonceSize:],
p.Key,
)
copy(p.keyAuthR[:], p.bufR[:SSize])
copy(p.tagR[:], data[:TagSize])
if !poly1305.Verify(p.tagR, data[TagSize:], p.keyAuthR) {
p.FramesUnauth++
p.BusyR.Unlock()
return false
}
out = p.bufR[S20BS : S20BS+len(data)-TagSize-NonceSize]
}
// Check if received nonce is known to us in either of two buckets.
// If yes, then this is ignored duplicate.
// Check from the oldest bucket, as in most cases this will result
// in constant time check.
// If Bucket0 is filled, then it becomes Bucket1.
p.NonceCipher.Decrypt(
data[len(data)-NonceSize:],
data[len(data)-NonceSize:],
)
p.nonceRecv = binary.BigEndian.Uint64(data[len(data)-NonceSize:])
if reorderable {
_, p.nonceFound0 = p.nonceBucket0[p.nonceRecv]
_, p.nonceFound1 = p.nonceBucket1[p.nonceRecv]
if p.nonceFound0 || p.nonceFound1 || p.nonceRecv+2*NonceBucketSize < p.nonceLatest {
p.FramesDup++
p.BusyR.Unlock()
return false
}
p.nonceBucket0[p.nonceRecv] = struct{}{}
p.nonceBucketN++
if p.nonceBucketN == NonceBucketSize {
p.nonceBucket1 = p.nonceBucket0
p.nonceBucket0 = make(map[uint64]struct{}, NonceBucketSize)
p.nonceBucketN = 0
}
} else {
if p.nonceRecv != p.NonceExpect {
p.FramesDup++
p.BusyR.Unlock()
return false
}
p.NonceExpect += 2
}
if p.nonceRecv > p.nonceLatest {
p.nonceLatest = p.nonceRecv
}
p.FramesIn++
atomic.AddUint64(&p.BytesIn, uint64(len(data)))
p.LastPing = time.Now()
p.pktSizeR = bytes.LastIndexByte(out, PadByte)
if p.pktSizeR == -1 {
p.BusyR.Unlock()
return false
}
// Validate the pad
for i := p.pktSizeR + 1; i < len(out); i++ {
if out[i] != 0 {
p.BusyR.Unlock()
return false
}
}
if p.pktSizeR == 0 {
p.HeartbeatRecv++
p.BusyR.Unlock()
return true
}
p.BytesPayloadIn += uint64(p.pktSizeR)
tap.Write(out[:p.pktSizeR])
p.BusyR.Unlock()
return true
}
func (h *HTTPListener) serveWrite(res http.ResponseWriter, req *http.Request) {
// Check that the content length is not too large for us to handle.
if req.ContentLength > h.MaxBodySize {
tooLarge(res)
return
}
now := time.Now()
// Handle gzip request bodies
body := req.Body
var err error
if req.Header.Get("Content-Encoding") == "gzip" {
body, err = gzip.NewReader(req.Body)
defer body.Close()
if err != nil {
log.Println("E! " + err.Error())
badRequest(res)
return
}
}
body = http.MaxBytesReader(res, body, h.MaxBodySize)
var return400 bool
var hangingBytes bool
buf := h.pool.get()
defer h.pool.put(buf)
bufStart := 0
for {
n, err := io.ReadFull(body, buf[bufStart:])
if err != nil && err != io.ErrUnexpectedEOF && err != io.EOF {
log.Println("E! " + err.Error())
// problem reading the request body
badRequest(res)
return
}
if err == io.EOF {
if return400 {
badRequest(res)
} else {
res.WriteHeader(http.StatusNoContent)
}
return
}
if hangingBytes {
i := bytes.IndexByte(buf, '\n')
if i == -1 {
// still didn't find a newline, keep scanning
continue
}
// rotate the bit remaining after the first newline to the front of the buffer
i++ // start copying after the newline
bufStart = len(buf) - i
if bufStart > 0 {
copy(buf, buf[i:])
}
hangingBytes = false
continue
}
if err == io.ErrUnexpectedEOF {
// finished reading the request body
if err := h.parse(buf[:n+bufStart], now); err != nil {
log.Println("E! " + err.Error())
return400 = true
}
if return400 {
badRequest(res)
} else {
res.WriteHeader(http.StatusNoContent)
}
return
}
// if we got down here it means that we filled our buffer, and there
// are still bytes remaining to be read. So we will parse up until the
// final newline, then push the rest of the bytes into the next buffer.
i := bytes.LastIndexByte(buf, '\n')
if i == -1 {
// drop any line longer than the max buffer size
log.Printf("E! http_listener received a single line longer than the maximum of %d bytes",
len(buf))
hangingBytes = true
return400 = true
bufStart = 0
continue
}
if err := h.parse(buf[:i], now); err != nil {
log.Println("E! " + err.Error())
return400 = true
}
// rotate the bit remaining after the last newline to the front of the buffer
i++ // start copying after the newline
bufStart = len(buf) - i
if bufStart > 0 {
copy(buf, buf[i:])
}
}
}
func (t *Follower) follow() error {
_, err := t.file.Seek(t.config.Offset, t.config.Whence)
if err != nil {
return err
}
var (
eventChan = make(chan fsnotify.Event)
errChan = make(chan error)
)
t.watcher, err = fsnotify.NewWatcher()
if err != nil {
return err
}
defer t.watcher.Close()
go t.watchFileEvents(eventChan, errChan)
t.watcher.Add(t.filename)
for {
for {
// discard leading NUL bytes
var discarded int
for {
b, _ := t.reader.Peek(peekSize)
i := bytes.LastIndexByte(b, '\x00')
if i > 0 {
n, _ := t.reader.Discard(i + 1)
discarded += n
}
if i+1 < peekSize {
break
}
}
s, err := t.reader.ReadBytes('\n')
if err != nil && err != io.EOF {
return err
}
// if we encounter EOF before a line delimiter,
// ReadBytes() will return the remaining bytes,
// so push them back onto the buffer, rewind
// our seek position, and wait for further file changes.
// we also have to save our dangling byte count in the event
// that we want to re-open the file and seek to the end
if err == io.EOF {
l := len(s)
t.offset, err = t.file.Seek(-int64(l), io.SeekCurrent)
if err != nil {
return err
}
t.reader.Reset(t.file)
break
}
t.sendLine(s, discarded)
}
// we're now at EOF, so wait for changes
select {
case evt := <-eventChan:
switch evt.Op {
// as soon as something is written, go back and read until EOF.
case fsnotify.Chmod:
fallthrough
case fsnotify.Write:
fi, err := t.file.Stat()
if err != nil {
if !os.IsNotExist(err) {
return err
}
// it's possible that an unlink can cause fsnotify.Chmod,
// so attempt to rewatch if the file is missing
if err := t.rewatch(); err != nil {
return err
}
continue
}
// file was truncated, seek to the beginning
if t.offset > fi.Size() {
t.offset, err = t.file.Seek(0, io.SeekStart)
if err != nil {
return err
}
t.reader.Reset(t.file)
}
continue
// if a file is removed or renamed
// and re-opening is desired, see if it appears
// again within a 1 second deadline. this should be enough time
// to see the file again for log rotation programs with this behavior
default:
if !t.config.Reopen {
return nil
}
if err := t.rewatch(); err != nil {
return err
}
continue
}
// any errors that come from fsnotify
case err := <-errChan:
return err
// a request to stop
case <-t.closeCh:
t.watcher.Remove(t.filename)
return nil
// fall back to 10 second polling if we haven't received any fsevents
// stat the file, if it's still there, just continue and try to read bytes
// if not, go through our re-opening routine
case <-time.After(10 * time.Second):
_, err := t.file.Stat()
if err == nil {
continue
}
if !os.IsNotExist(err) {
return err
}
if err := t.rewatch(); err != nil {
return err
}
continue
}
}
return nil
}