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lambda.go
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lambda.go
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package main
import (
"bufio"
"bytes"
"compress/gzip"
"context"
"encoding/json"
"fmt"
"github.com/aws/aws-lambda-go/events"
"github.com/aws/aws-lambda-go/lambda"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"io"
"log"
"net/http"
"os"
"strconv"
"strings"
)
// Struct for storing the log data in an object that can be serialized into JSON.
type LogLine struct {
Date string `json:"date"`
ClientIP string `json:"client_ip"`
ClientMethod string `json:"client_method"`
RequestURIStem string `json:"request_uri_stem"`
HTTPResponseCode string `json:"http_response_code"`
RefererPage string `json:"referer_page"`
ClientUserAgent string `json:"client_user_agent"`
BotDetected string `json:"bot_detected"`
QueryString string `json:"query_string"`
CFEdgeResult string `json:"cf_edge_result"`
HostHeader string `json:"host_header"`
HTTPProtocol string `json:"http_protocol"`
SSLProtocol string `json:"ssl_protocol"`
CFClientResult string `json:"cf_client_result"`
IndexName string `json:"-"`
}
// Type and constant array for making the extraction more human readable.
type LogPart int
const (
CFDate LogPart = 0
CFTime LogPart = 1
CIp LogPart = 4
CSMethod LogPart = 5
CSUriStem LogPart = 7
SCStatus LogPart = 8
CSReferer LogPart = 9
CSUserAgent LogPart = 10
CSQueryString LogPart = 11
XEdgeResultType LogPart = 13
XHostHeader LogPart = 15
CSProtocol LogPart = 16
SSLProtocol LogPart = 20
XEdgeResponseType LogPart = 22
)
func HandleRequest(ctx context.Context, event events.S3Event) {
log.Print("New log file detected: " + event.Records[0].S3.Object.Key)
bulkJson := ""
var jsonBuffer bytes.Buffer
zippedObject, err := getS3Object(event.Records[0].S3.Bucket.Name, event.Records[0].S3.Object.Key)
if err != nil {
log.Fatal("Unable to GET new file from S3.")
}
buf := bytes.NewBuffer(zippedObject)
unzippedObject, err := gzip.NewReader(buf)
if err != nil {
log.Fatal("Unable to unzip new file.")
}
scanner := bufio.NewScanner(unzippedObject)
for scanner.Scan() {
lineText := scanner.Text()
lineParts := strings.Split(lineText, "\t")
if strings.HasPrefix(lineParts[0], "#") {
continue
} else {
parsedLine, err := parseLogLine(lineParts)
if err != nil {
log.Fatal(err)
} else {
lineJsonBytes, err := json.Marshal(parsedLine)
if err != nil {
log.Fatal("Object could not be converted to JSON.")
}
lineJsonString := string(lineJsonBytes)
jsonBuffer.WriteString("{ \"index\" : { \"_index\" : \"" + parsedLine.IndexName + "\"} }\n" + lineJsonString + "\n")
}
}
}
bulkJson = jsonBuffer.String()
if err := scanner.Err(); err != nil {
log.Fatal(err)
}
elasticURI := os.Getenv("elastic_url")
var payloadBytes = []byte(bulkJson)
req, err := http.NewRequest("POST", elasticURI, bytes.NewBuffer(payloadBytes))
req.Header.Set("Content-Type", "application/json")
req.SetBasicAuth(os.Getenv("elastic_user"), os.Getenv("elastic_password"))
client := &http.Client{}
resp, err := client.Do(req)
if err != nil {
log.Fatal("Post failed")
}
defer resp.Body.Close()
log.Printf("Elastic response code: %s", resp.Status)
}
func parseLogLine(logLineParts []string) (*LogLine, error) {
if len(logLineParts) != 33 {
return nil, fmt.Errorf("log line import failed: row length incorrect expected 26 got :%s", strconv.FormatInt(int64(len(logLineParts)), 10))
}
var parsedLine LogLine
parsedLine.IndexName = "weblogs-" + logLineParts[CFDate]
parsedLine.Date = logLineParts[CFDate] + " " + logLineParts[CFTime]
parsedLine.ClientIP = logLineParts[CIp]
parsedLine.ClientMethod = logLineParts[CSMethod]
parsedLine.RequestURIStem = logLineParts[CSUriStem]
parsedLine.HTTPResponseCode = logLineParts[SCStatus]
parsedLine.RefererPage = logLineParts[CSReferer]
parsedLine.ClientUserAgent = logLineParts[CSUserAgent]
if strings.Contains(strings.ToLower(logLineParts[CSUserAgent]), "googlebot") {
parsedLine.BotDetected = "GoogleBot"
} else if strings.Contains(strings.ToLower(logLineParts[CSUserAgent]), "googleimageproxy") {
parsedLine.BotDetected = "GoogleImageBot"
} else if strings.Contains(strings.ToLower(logLineParts[CSUserAgent]), "bingbot") {
parsedLine.BotDetected = "BingBot"
} else if strings.Contains(strings.ToLower(logLineParts[CSUserAgent]), "baiduspider") {
parsedLine.BotDetected = "BaiduSpider"
} else if strings.Contains(strings.ToLower(logLineParts[CSUserAgent]), "yahoo!") {
parsedLine.BotDetected = "Yahoo! Slurp"
} else if strings.Contains(strings.ToLower(logLineParts[CSUserAgent]), "yandex") {
parsedLine.BotDetected = "Yandex"
} else {
parsedLine.BotDetected = "Human"
}
parsedLine.QueryString = logLineParts[CSQueryString]
parsedLine.CFEdgeResult = logLineParts[XEdgeResultType]
parsedLine.HostHeader = logLineParts[XHostHeader]
parsedLine.HTTPProtocol = logLineParts[CSProtocol]
parsedLine.SSLProtocol = logLineParts[SSLProtocol]
parsedLine.CFClientResult = logLineParts[XEdgeResponseType]
return &parsedLine, nil
}
// Returns contents of S3 item as byte array
func getS3Object(bucket string, key string) ([]byte, error) {
awsSess := session.New()
s3req := s3.New(awsSess, aws.NewConfig().WithRegion(os.Getenv("aws_s3_region")))
res, err := s3req.GetObject(&s3.GetObjectInput{
Bucket: aws.String(bucket),
Key: aws.String(key),
})
if err != nil {
return nil, err
}
defer res.Body.Close()
buf := bytes.NewBuffer(nil)
if _, err := io.Copy(buf, res.Body); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func main() {
lambda.Start(HandleRequest)
}