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