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|
package nsa
import (
"database/sql"
"encoding/json"
"errors"
"fmt"
"os"
"strings"
)
var database *sql.DB
var eventmap = make(map[string]int)
type Logger struct {
ip string
}
func NewLogger(ip string) *Logger {
return &Logger{
ip: ip,
}
}
func (l *Logger) getEventID(event string) int {
evID, ok := eventmap[event]
if !ok {
logErr("Event %s does not exist.", event)
return 0
}
return evID
}
func (l *Logger) getJSON(data interface{}) string {
jsonStr, err := json.Marshal(data)
if err != nil {
logErr("%v", err)
return ""
}
return string(jsonStr)
}
func (l *Logger) insertEvent(id int, data string) {
if database == nil {
return
}
_, err := database.Exec(
"INSERT INTO nsa.events (type, data, client_ip) VALUES ($1, $2, $3);",
id, data, l.ip)
if err != nil {
logErr("%v", err)
}
}
func (l *Logger) Log(event string, data interface{}) {
if database == nil {
return
}
go func() {
id := l.getEventID(event)
if id == 0 {
return
}
d := l.getJSON(data)
if d == "" {
return
}
l.insertEvent(id, d)
}()
}
func logErr(msg string, params ...interface{}) {
fmt.Fprintf(
os.Stderr,
"NSA: Error: %v\n",
fmt.Sprintf(msg, params...))
}
func Init(db *sql.DB) error {
err := db.Ping()
if err != nil {
return err
}
database = db
return nil
}
func SetEvents(events []string) error {
if database == nil {
return errors.New("not initialized")
}
rows, err := database.Query("SELECT id, name FROM nsa.event_types;")
if err != nil {
return err
}
defer rows.Close()
for rows.Next() {
var id int
var name string
rows.Scan(&id, &name)
eventmap[name] = id
}
newEvents := []string{}
params := ""
paramNum := 1
for _, event := range events {
e := strings.ToUpper(event)
if _, ok := eventmap[event]; ok {
continue
}
newEvents = append(newEvents, e)
params += fmt.Sprintf("($%d),", paramNum)
paramNum++
}
if len(newEvents) > 0 {
params = params[0 : len(params)-1]
values := []interface{}{}
for _, event := range newEvents {
values = append(values, event)
}
rows, err = database.Query(
fmt.Sprintf(
"INSERT INTO nsa.event_types (name) VALUES %s RETURNING id;",
params),
values...)
if err != nil {
return err
}
defer rows.Close()
i := 0
for rows.Next() {
var id int
rows.Scan(&id)
eventmap[newEvents[i]] = id
i++
}
}
return nil
}
|
