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revDns.go
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revDns.go
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package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"strconv"
"github.com/gorilla/mux"
"github.com/gviz/revDNS/internal/revconfig"
"github.com/gviz/revDNS/internal/revdb"
)
type writeReq struct {
ip string
domains []string
c chan struct{}
}
type revDns struct {
httpReq chan lkupReq
writer chan writeReq
db revdb.DBIface
conf *revconfig.RevConfig
}
func NewRevDns(conf *revconfig.RevConfig) *revDns {
return &revDns{
httpReq: make(chan lkupReq, 50000),
writer: make(chan writeReq, 50000),
conf: conf,
}
}
func (r *revDns) httpHandler() {
router := mux.NewRouter()
router.Handle("/revdns/api/v1/ip/{ip}", &lkup{c: r.httpReq}).Methods("GET")
server := fmt.Sprintf(":%s", strconv.Itoa(r.conf.Api.Port))
log.Fatal(http.ListenAndServe(server, router))
}
func (r *revDns) Start() {
log.Println("Starting DB handler ...")
go r.dbHandler()
log.Println("Starting http handler")
go r.httpHandler()
}
//Handle DB lookups and updates
func (r *revDns) dbHandler() {
db := revdb.NewDefaultBoltDB()
if db == nil {
log.Fatal("Error opening DB")
}
r.db = db
defer db.Close()
for {
select {
case webreq := <-r.httpReq:
go func(httpReq lkupReq) {
rsp, err := db.ReadDB(httpReq.ip)
if err == nil {
log.Println("Responding ...", rsp)
json.NewEncoder(httpReq.w).Encode(rsp)
httpReq.c <- struct{}{}
}
}(webreq)
case wr := <-r.writer:
go func(w writeReq) {
//log.Println("Write request :", w)
db.WriteDB(wr.ip, wr.domains)
wr.c <- struct{}{}
}(wr)
}
}
}