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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,196 @@ | ||
| package parsercommon | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strconv" | ||
| "strings" | ||
| ) | ||
|
|
||
| const ( | ||
| NO_VERSION = -1 | ||
| ) | ||
|
|
||
| var ( | ||
| ErrEOL = &ParserError{"End of log line"} | ||
| ErrNoSpace = &ParserError{"No space found"} | ||
|
|
||
| ErrPriorityNoStart = &ParserError{"No start char found for priority"} | ||
| ErrPriorityEmpty = &ParserError{"Priority field empty"} | ||
| ErrPriorityNoEnd = &ParserError{"No end char found for priority"} | ||
| ErrPriorityTooShort = &ParserError{"Priority field too short"} | ||
| ErrPriorityTooLong = &ParserError{"Priority field too long"} | ||
| ErrPriorityNonDigit = &ParserError{"Non digit found in priority"} | ||
|
|
||
| ErrVersionNotFound = &ParserError{"Can not find version"} | ||
|
|
||
| ErrTimestampUnknownFormat = &ParserError{"Timestamp format unknown"} | ||
|
|
||
| ErrHostnameNotFound = &ParserError{"Hostname not found"} | ||
| ) | ||
|
|
||
| type ParserError struct { | ||
| ErrorString string | ||
| } | ||
|
|
||
| type Priority struct { | ||
| P int | ||
| F Facility | ||
| S Severity | ||
| } | ||
|
|
||
| type Facility struct { | ||
| Value int | ||
| } | ||
|
|
||
| type Severity struct { | ||
| Value int | ||
| } | ||
|
|
||
| // https://tools.ietf.org/html/rfc3164#section-4.1 | ||
| func ParsePriority(buff []byte, cursor *int, l int) (*Priority, error) { | ||
| if l <= 0 { | ||
| return nil, ErrPriorityEmpty | ||
| } | ||
|
|
||
| if buff[*cursor] != '<' { | ||
| return nil, ErrPriorityNoStart | ||
| } | ||
|
|
||
| i := 1 | ||
| priDigit := 0 | ||
|
|
||
| for i < l { | ||
| if i >= 5 { | ||
| return nil, ErrPriorityTooLong | ||
| } | ||
|
|
||
| c := buff[i] | ||
|
|
||
| if c == '>' { | ||
| if i == 1 { | ||
| return nil, ErrPriorityTooShort | ||
| } | ||
|
|
||
| *cursor = i + 1 | ||
|
|
||
| return NewPriority(priDigit), nil | ||
| } | ||
|
|
||
| if IsDigit(c) { | ||
| v, e := strconv.Atoi(string(c)) | ||
| if e != nil { | ||
| return nil, e | ||
| } | ||
|
|
||
| priDigit = (priDigit * 10) + v | ||
| } else { | ||
| return nil, ErrPriorityNonDigit | ||
| } | ||
|
|
||
| i++ | ||
| } | ||
|
|
||
| return nil, ErrPriorityNoEnd | ||
| } | ||
|
|
||
| // https://tools.ietf.org/html/rfc5424#section-6.2.2 | ||
| func ParseVersion(buff []byte, cursor *int, l int) (int, error) { | ||
| if *cursor >= l { | ||
| return NO_VERSION, ErrVersionNotFound | ||
| } | ||
|
|
||
| c := buff[*cursor] | ||
| *cursor++ | ||
|
|
||
| // XXX : not a version, not an error though as RFC 3164 does not support it | ||
| if !IsDigit(c) { | ||
| return NO_VERSION, nil | ||
| } | ||
|
|
||
| v, e := strconv.Atoi(string(c)) | ||
| if e != nil { | ||
| *cursor-- | ||
| return NO_VERSION, e | ||
| } | ||
|
|
||
| return v, nil | ||
|
|
||
| } | ||
|
|
||
| func IsDigit(c byte) bool { | ||
| return c >= '0' && c <= '9' | ||
| } | ||
|
|
||
| func NewPriority(p int) *Priority { | ||
| // The Priority value is calculated by first multiplying the Facility | ||
| // number by 8 and then adding the numerical value of the Severity. | ||
|
|
||
| return &Priority{ | ||
| P: p, | ||
| F: Facility{Value: p / 8}, | ||
| S: Severity{Value: p % 8}, | ||
| } | ||
| } | ||
|
|
||
| func FindNextSpace(buff []byte, from int, l int) (int, error) { | ||
| var to int | ||
|
|
||
| for to = from; to < l; to++ { | ||
| if buff[to] == ' ' { | ||
| to++ | ||
| return to, nil | ||
| } | ||
| } | ||
|
|
||
| return 0, ErrNoSpace | ||
| } | ||
|
|
||
| func Parse2Digits(buff []byte, cursor *int, l int, min int, max int, e error) (int, error) { | ||
| digitLen := 2 | ||
|
|
||
| if *cursor+digitLen > l { | ||
| return 0, ErrEOL | ||
| } | ||
|
|
||
| sub := string(buff[*cursor : *cursor+digitLen]) | ||
|
|
||
| *cursor += digitLen | ||
|
|
||
| i, err := strconv.Atoi(sub) | ||
| if err != nil { | ||
| return 0, e | ||
| } | ||
|
|
||
| if i >= min && i <= max { | ||
| return i, nil | ||
| } | ||
|
|
||
| return 0, e | ||
| } | ||
|
|
||
| func ParseHostname(buff []byte, cursor *int, l int) (string, error) { | ||
| from := *cursor | ||
| var to int | ||
|
|
||
| for to = from; to < l; to++ { | ||
| if buff[to] == ' ' { | ||
| break | ||
| } | ||
| } | ||
|
|
||
| hostname := buff[from:to] | ||
|
|
||
| *cursor = to | ||
|
|
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| return string(hostname), nil | ||
| } | ||
|
|
||
| func ShowCursorPos(buff []byte, cursor int) { | ||
| fmt.Println(string(buff)) | ||
| padding := strings.Repeat("-", cursor) | ||
| fmt.Println(padding + "↑\n") | ||
| } | ||
|
|
||
| func (err *ParserError) Error() string { | ||
| return err.ErrorString | ||
| } |
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