Created
July 21, 2019 04:01
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Sync TiDB logs to Loki
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| package main | |
| import ( | |
| "bufio" | |
| "bytes" | |
| "encoding/json" | |
| "flag" | |
| "fmt" | |
| "io" | |
| "net/http" | |
| "os" | |
| "regexp" | |
| "strings" | |
| "time" | |
| ) | |
| var ( | |
| addr string | |
| path string | |
| job string | |
| expr *regexp.Regexp | |
| ) | |
| const logFormat = `\[(?P<time>\d{4}\/\d{2}\/\d{2}.\d{2}:\d{2}:\d{2}.\d{3}.\+\d{2}:\d{2})\].\[(?P<level>\w*)\].\[(?P<source>\w.*):(?P<line>\d*)\].(?P<message>.*$)` | |
| const timeFormat = "2006/01/02 15:04:05.000 -07:00" | |
| func init() { | |
| flag.StringVar(&addr, "addr", "http://127.0.0.1:3100/api/prom/push", "Loki Address") | |
| flag.StringVar(&path, "path", "", "Log to be synced to Loki") | |
| flag.StringVar(&job, "job", "tikv", "Job name") | |
| } | |
| func perr(err error) { | |
| if err == nil { | |
| return | |
| } | |
| println(err.Error()) | |
| os.Exit(1) | |
| } | |
| type entryBody struct { | |
| Timestamp string `json:"ts"` | |
| Line string `json:"line"` | |
| } | |
| type streamBody struct { | |
| Labels string `json:"labels"` | |
| Entries []entryBody `json:"entries"` | |
| } | |
| type jsonBody struct { | |
| Streams []streamBody `json:"streams"` | |
| } | |
| func postLog(labels string, ts time.Time, line string) { | |
| body := jsonBody{ | |
| Streams: []streamBody{ | |
| { | |
| Labels: labels, | |
| Entries: []entryBody{ | |
| { | |
| Timestamp: ts.Format("2006-01-02T15:04:05.000000-07:00"), | |
| Line: line, | |
| }, | |
| }, | |
| }, | |
| }, | |
| } | |
| jsonValue, err := json.Marshal(body) | |
| perr(err) | |
| _, err = http.Post(addr, "application/json", bytes.NewBuffer(jsonValue)) | |
| perr(err) | |
| } | |
| func watchLog() { | |
| f, err := os.Open(path) | |
| perr(err) | |
| defer f.Close() | |
| reader := bufio.NewReader(f) | |
| for { | |
| line, _, err := reader.ReadLine() | |
| if err == io.EOF { | |
| // Very simple way, sleep and try again | |
| time.Sleep(time.Second) | |
| continue | |
| } | |
| perr(err) | |
| labels, ts, newLine := parseLine(string(line)) | |
| fmt.Printf("%v %s %s\n", labels, ts, newLine) | |
| postLog(labels, ts, newLine) | |
| } | |
| } | |
| // Label is the key-value label | |
| type Label struct { | |
| Key string | |
| Value string | |
| } | |
| func parseLine(line string) (labelString string, t time.Time, s string) { | |
| s = line | |
| match := expr.FindStringSubmatch(line) | |
| if match == nil { | |
| return | |
| } | |
| var err error | |
| labels := []Label{ | |
| {Key: "job", Value: job}, | |
| } | |
| for i, name := range expr.SubexpNames() { | |
| if i != 0 && name != "" { | |
| if name == "time" { | |
| t, err = time.Parse(timeFormat, match[i]) | |
| perr(err) | |
| s = strings.TrimSpace(line) | |
| s = s[len(fmt.Sprintf("[%s]", match[i])):] | |
| } else if name == "level" { | |
| labels = append(labels, Label{Key: name, Value: match[i]}) | |
| } | |
| } | |
| } | |
| var buf bytes.Buffer | |
| buf.WriteString("{") | |
| for i, label := range labels { | |
| buf.WriteString(fmt.Sprintf("%s=\"%s\"", label.Key, label.Value)) | |
| if i != len(labels)-1 { | |
| buf.WriteString(",") | |
| } | |
| } | |
| buf.WriteString("}") | |
| labelString = buf.String() | |
| return | |
| } | |
| func main() { | |
| flag.Parse() | |
| expr = regexp.MustCompile(logFormat) | |
| watchLog() | |
| } |
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