traefik/middlewares/accesslog/parser.go

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2018-03-14 13:12:04 +00:00
package accesslog
import (
"bytes"
"regexp"
)
// ParseAccessLog parse line of access log and return a map with each fields
func ParseAccessLog(data string) (map[string]string, error) {
var buffer bytes.Buffer
buffer.WriteString(`(\S+)`) // 1 - ClientHost
buffer.WriteString(`\s-\s`) // - - Spaces
buffer.WriteString(`(\S+)\s`) // 2 - ClientUsername
buffer.WriteString(`\[([^]]+)\]\s`) // 3 - StartUTC
buffer.WriteString(`"(\S*)\s?`) // 4 - RequestMethod
buffer.WriteString(`((?:[^"]*(?:\\")?)*)\s`) // 5 - RequestPath
buffer.WriteString(`([^"]*)"\s`) // 6 - RequestProtocol
buffer.WriteString(`(\S+)\s`) // 7 - OriginStatus
buffer.WriteString(`(\S+)\s`) // 8 - OriginContentSize
buffer.WriteString(`("?\S+"?)\s`) // 9 - Referrer
buffer.WriteString(`("\S+")\s`) // 10 - User-Agent
buffer.WriteString(`(\S+)\s`) // 11 - RequestCount
buffer.WriteString(`("[^"]*"|-)\s`) // 12 - FrontendName
buffer.WriteString(`("[^"]*"|-)\s`) // 13 - BackendURL
buffer.WriteString(`(\S+)`) // 14 - Duration
regex, err := regexp.Compile(buffer.String())
if err != nil {
return nil, err
}
submatch := regex.FindStringSubmatch(data)
result := make(map[string]string)
// Need to be > 13 to match CLF format
if len(submatch) > 13 {
result[ClientHost] = submatch[1]
result[ClientUsername] = submatch[2]
result[StartUTC] = submatch[3]
result[RequestMethod] = submatch[4]
result[RequestPath] = submatch[5]
result[RequestProtocol] = submatch[6]
result[OriginStatus] = submatch[7]
result[OriginContentSize] = submatch[8]
result[RequestRefererHeader] = submatch[9]
result[RequestUserAgentHeader] = submatch[10]
result[RequestCount] = submatch[11]
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result[RouterName] = submatch[12]
result[ServiceURL] = submatch[13]
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result[Duration] = submatch[14]
}
return result, nil
}