| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package nginx |
| 4 | |
| 5 | import ( |
| 6 | "bufio" |
| 7 | "fmt" |
| 8 | "io" |
| 9 | "regexp" |
| 10 | "strconv" |
| 11 | "strings" |
| 12 | ) |
| 13 | |
| 14 | const ( |
| 15 | connActive = "connActive" |
| 16 | connAccepts = "connAccepts" |
| 17 | connHandled = "connHandled" |
| 18 | requests = "requests" |
| 19 | requestTime = "requestTime" |
| 20 | connReading = "connReading" |
| 21 | connWriting = "connWriting" |
| 22 | connWaiting = "connWaiting" |
| 23 | ) |
| 24 | |
| 25 | var ( |
| 26 | nginxSeq = []string{ |
| 27 | connActive, |
| 28 | connAccepts, |
| 29 | connHandled, |
| 30 | requests, |
| 31 | connReading, |
| 32 | connWriting, |
| 33 | connWaiting, |
| 34 | } |
| 35 | tengineSeq = []string{ |
| 36 | connActive, |
| 37 | connAccepts, |
| 38 | connHandled, |
| 39 | requests, |
| 40 | requestTime, |
| 41 | connReading, |
| 42 | connWriting, |
| 43 | connWaiting, |
| 44 | } |
| 45 | |
| 46 | reStatus = regexp.MustCompile(`^Active connections: ([0-9]+)\n[^\d]+([0-9]+) ([0-9]+) ([0-9]+) ?([0-9]+)?\nReading: ([0-9]+) Writing: ([0-9]+) Waiting: ([0-9]+)`) |
| 47 | ) |
| 48 | |
| 49 | type stubStatus struct { |
| 50 | Connections struct { |
| 51 | // The current number of active client connections including Waiting connections. |
| 52 | Active int64 `stm:"active"` |
| 53 | |
| 54 | // The total number of accepted client connections. |
| 55 | Accepts int64 `stm:"accepts"` |
| 56 | |
| 57 | // The total number of handled connections. |
| 58 | // Generally, the parameter value is the same as accepts unless some resource limits have been reached. |
| 59 | Handled int64 `stm:"handled"` |
| 60 | |
| 61 | // The current number of connections where nginx is reading the request header. |
| 62 | Reading int64 `stm:"reading"` |
| 63 | |
| 64 | // The current number of connections where nginx is writing the response back to the client. |
| 65 | Writing int64 `stm:"writing"` |
| 66 | |
| 67 | // The current number of idle client connections waiting for a request. |
| 68 | Waiting int64 `stm:"waiting"` |
| 69 | } `stm:""` |
| 70 | Requests struct { |
| 71 | // The total number of client requests. |
| 72 | Total int64 `stm:"requests"` |
| 73 | |
| 74 | // Note: tengine specific |
| 75 | // The total requests' response time, which is in millisecond |
| 76 | Time *int64 `stm:"request_time"` |
| 77 | } `stm:""` |
| 78 | } |
| 79 | |
| 80 | func parseStubStatus(r io.Reader) (*stubStatus, error) { |
| 81 | sc := bufio.NewScanner(r) |
| 82 | var lines []string |
| 83 | |
| 84 | for sc.Scan() { |
| 85 | lines = append(lines, strings.Trim(sc.Text(), "\r\n ")) |
| 86 | } |
| 87 | |
| 88 | parsed := reStatus.FindStringSubmatch(strings.Join(lines, "\n")) |
| 89 | |
| 90 | if len(parsed) == 0 { |
| 91 | return nil, fmt.Errorf("can't parse '%v'", lines) |
| 92 | } |
| 93 | |
| 94 | parsed = parsed[1:] |
| 95 | |
| 96 | var ( |
| 97 | seq []string |
| 98 | status stubStatus |
| 99 | ) |
| 100 | |
| 101 | switch len(parsed) { |
| 102 | default: |
| 103 | return nil, fmt.Errorf("invalid number of fields, got %d, expect %d or %d", len(parsed), len(nginxSeq), len(tengineSeq)) |
| 104 | case len(nginxSeq): |
| 105 | seq = nginxSeq |
| 106 | case len(tengineSeq): |
| 107 | seq = tengineSeq |
| 108 | } |
| 109 | |
| 110 | for i, key := range seq { |
| 111 | strValue := parsed[i] |
| 112 | if strValue == "" { |
| 113 | continue |
| 114 | } |
| 115 | value := mustParseInt(strValue) |
| 116 | switch key { |
| 117 | default: |
| 118 | return nil, fmt.Errorf("unknown key in seq : %s", key) |
| 119 | case connActive: |
| 120 | status.Connections.Active = value |
| 121 | case connAccepts: |
| 122 | status.Connections.Accepts = value |
| 123 | case connHandled: |
| 124 | status.Connections.Handled = value |
| 125 | case requests: |
| 126 | status.Requests.Total = value |
| 127 | case connReading: |
| 128 | status.Connections.Reading = value |
| 129 | case connWriting: |
| 130 | status.Connections.Writing = value |
| 131 | case connWaiting: |
| 132 | status.Connections.Waiting = value |
| 133 | case requestTime: |
| 134 | status.Requests.Time = &value |
| 135 | } |
| 136 | } |
| 137 | |
| 138 | return &status, nil |
| 139 | } |
| 140 | |
| 141 | func mustParseInt(value string) int64 { |
| 142 | v, err := strconv.ParseInt(value, 10, 64) |
| 143 | if err != nil { |
| 144 | panic(err) |
| 145 | } |
| 146 | return v |
| 147 | } |