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// Package analytics provides the methods to run an analytics reporting system
// for API requests which may be useful to users for measuring access and
// possibly identifying bad actors abusing requests.
package analytics
import (
"encoding/json"
"log"
"net/http"
"runtime"
"strings"
"time"
"github.com/boltdb/bolt"
)
type apiRequest struct {
URL string `json:"url"`
Method string `json:"http_method"`
Origin string `json:"origin"`
Proto string `json:"http_protocol"`
RemoteAddr string `json:"ip_address"`
Timestamp int64 `json:"timestamp"`
External bool `json:"external"`
}
var (
store *bolt.DB
requestChan chan apiRequest
)
// Record queues an apiRequest for metrics
func Record(req *http.Request) {
external := strings.Contains(req.URL.Path, "/external/")
r := apiRequest{
URL: req.URL.String(),
Method: req.Method,
Origin: req.Header.Get("Origin"),
Proto: req.Proto,
RemoteAddr: req.RemoteAddr,
Timestamp: time.Now().Unix() * 1000,
External: external,
}
// put r on buffered requestChan to take advantage of batch insertion in DB
requestChan <- r
}
// Close exports the abillity to close our db file. Should be called with defer
// after call to Init() from the same place.
func Close() {
err := store.Close()
if err != nil {
log.Println(err)
}
}
// Init creates a db connection, should run an initial prune of old data, and
// sets up the queue/batching channel
func Init() {
var err error
store, err = bolt.Open("analytics.db", 0666, nil)
if err != nil {
log.Fatalln(err)
}
requestChan = make(chan apiRequest, 1024*64*runtime.NumCPU())
go serve()
if err != nil {
log.Fatalln(err)
}
}
func serve() {
// make timer to notify select to batch request insert from requestChan
// interval: 30 seconds
apiRequestTimer := time.NewTicker(time.Second * 30)
// make timer to notify select to remove analytics older than 14 days
// interval: 1 weeks
// TODO: enable analytics backup service to cloud
pruneThreshold := time.Hour * 24 * 14
pruneDBTimer := time.NewTicker(pruneThreshold / 2)
for {
select {
case <-apiRequestTimer.C:
err := batchInsert(requestChan)
if err != nil {
log.Println(err)
}
case <-pruneDBTimer.C:
err := batchPrune(pruneThreshold)
if err != nil {
log.Println(err)
}
case <-time.After(time.Second * 30):
continue
}
}
}
// Week returns the map containing decoded javascript needed to chart a week of data by day
func Week() (map[string]interface{}, error) {
// set thresholds for today and the 6 days preceeding
times := [7]time.Time{}
dates := [7]string{}
now := time.Now()
today := time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, time.UTC)
for i := range times {
// subtract 24 * i hours to make days prior
dur := time.Duration(24 * i * -1)
day := today.Add(time.Hour * dur)
// day threshold is [...n-1-i, n-1, n]
times[len(times)-1-i] = day
dates[len(times)-1-i] = day.Format("01/02")
}
// get api request analytics from db
var requests = []apiRequest{}
err := store.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte("requests"))
err := b.ForEach(func(k, v []byte) error {
var r apiRequest
err := json.Unmarshal(v, &r)
if err != nil {
log.Println("Error decoding json from analytics db:", err)
return nil
}
requests = append(requests, r)
return nil
})
if err != nil {
return err
}
return nil
})
if err != nil {
return nil, err
}
ips := [7]map[string]struct{}{}
for i := range ips {
ips[i] = make(map[string]struct{})
}
total := [7]int{}
unique := [7]int{}
CHECK_REQUEST:
for i := range requests {
ts := time.Unix(requests[i].Timestamp/1000, 0)
for j := range times {
// if on today, there will be no next iteration to set values for
// day prior so all valid requests belong to today
if j == len(times)-1 {
if ts.After(times[j]) || ts.Equal(times[j]) {
// do all record keeping
total[j]++
if _, ok := ips[j][requests[i].RemoteAddr]; !ok {
unique[j]++
ips[j][requests[i].RemoteAddr] = struct{}{}
}
continue CHECK_REQUEST
}
}
if ts.Equal(times[j]) {
// increment total count for current time threshold (day)
total[j]++
// if no IP found for current threshold, increment unique and record IP
if _, ok := ips[j][requests[i].RemoteAddr]; !ok {
unique[j]++
ips[j][requests[i].RemoteAddr] = struct{}{}
}
continue CHECK_REQUEST
}
if ts.Before(times[j]) {
// check if older than earliest threshold
if j == 0 {
continue CHECK_REQUEST
}
// increment total count for previous time threshold (day)
total[j-1]++
// if no IP found for day prior, increment unique and record IP
if _, ok := ips[j-1][requests[i].RemoteAddr]; !ok {
unique[j-1]++
ips[j-1][requests[i].RemoteAddr] = struct{}{}
}
}
}
}
jsUnique, err := json.Marshal(unique)
if err != nil {
return nil, err
}
jsTotal, err := json.Marshal(total)
if err != nil {
return nil, err
}
return map[string]interface{}{
"dates": dates,
"unique": string(jsUnique),
"total": string(jsTotal),
}, nil
}
|
