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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 (
"log"
"net/http"
"strings"
"time"
"github.com/boltdb/bolt"
)
type apiRequest struct {
URL string `json:"url"`
Method string `json:"http_method"`
RemoteAddr string `json:"ip_address"`
Timestamp int64 `json:"timestamp"`
External bool `json:"external"`
}
var (
store *bolt.DB
recordChan 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,
RemoteAddr: req.RemoteAddr,
Timestamp: time.Now().Unix() * 1000,
External: external,
}
// put r on buffered recordChan to take advantage of batch insertion in DB
recordChan <- 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() {
store, err := bolt.Open("analytics.db", 0666, nil)
if err != nil {
log.Fatalln(err)
}
recordChan = make(chan apiRequest, 1024*128)
go serve()
err = store.Update(func(tx *bolt.Tx) error {
return nil
})
}
func serve() {
// make timer to notify select to batch request insert from recordChan
// interval: 1 minute
apiRequestTimer := time.NewTicker(time.Minute * 1)
// make timer to notify select to remove old analytics
// interval: 2 weeks
// TODO: enable analytics backup service to cloud
pruneDBTimer := time.NewTicker(time.Hour * 24 * 14)
for {
select {
case <-apiRequestTimer.C:
var reqs []apiRequest
batchSize := len(recordChan)
for i := 0; i < batchSize; i++ {
reqs = append(reqs, <-recordChan)
}
case <-pruneDBTimer.C:
default:
}
}
}
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