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// Copyright (C) 2014 Nippon Telegraph and Telephone Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package api
import (
"encoding/json"
"fmt"
log "github.com/Sirupsen/logrus"
"github.com/gorilla/mux"
"net/http"
"strconv"
)
const (
_ = iota
REQ_NEIGHBOR
REQ_NEIGHBORS
REQ_ADJ_RIB_IN
REQ_ADJ_RIB_OUT
REQ_LOCAL_RIB
)
const (
BASE_VERSION = "/v1"
NEIGHBOR = "/bgp/neighbor"
NEIGHBORS = "/bgp/neighbors"
ADJ_RIB_IN = "/bgp/adj-rib-in"
ADJ_RIB_OUT = "/bgp/adj-rib-out"
ADJ_RIB_LOCAL = "/bgp/adj-rib-local"
ADJ_RIB_LOCAL_BEST = "/bgp/adj-rib-local/best"
PARAM_REMOTE_PEER_ADDR = "remotePeerAddr"
)
const REST_PORT = 8080
const (
_ = iota
JSON_FORMATTED
JSON_UN_FORMATTED
)
var JsonFormat int = JSON_FORMATTED
// trigger struct for exchanging information in the rest and peer.
// rest and peer operated at different thread.
type RestRequest struct {
RequestType int
RemoteAddr string
ResponseCh chan RestResponse
Err error
}
func NewRestRequest(reqType int, remoteAddr string) *RestRequest {
r := &RestRequest{
RequestType: reqType,
RemoteAddr: remoteAddr,
ResponseCh: make(chan RestResponse),
}
return r
}
type RestResponse interface {
Err() error
}
type RestResponseDefault struct {
ResponseErr error
Data []byte
}
func (r *RestResponseDefault) Err() error {
return r.ResponseErr
}
// Response struct for Neighbor
type RestResponseNeighbor struct {
RestResponseDefault
RemoteAddr string
RemoteAs uint32
NeighborState string
UpdateCount int
}
// Response struct for Rib
type RestResponseRib struct {
RestResponseDefault
RemoteAddr string
RemoteAs uint32
RibInfo []string
}
type RestServer struct {
port int
bgpServerCh chan *RestRequest
}
func NewRestServer(port int, bgpServerCh chan *RestRequest) *RestServer {
rs := &RestServer{
port: port,
bgpServerCh: bgpServerCh}
return rs
}
// Main thread of rest service.
// URL than can receive.
// get state of neighbors.
// -- curl -i -X GET http://<ownIP>:8080/v1/bgp/neighbors
// get state of neighbor.
// -- curl -i -X GET http://<ownIP>:8080/v1/bgp/neighbor/<remote address of target neighbor>
// get adj-rib-in of each neighbor.
// -- curl -i -X GET http://<ownIP>:8080/v1/bgp/neighbor/<remote address of target neighbor>/adj-rib-in
// get adj-rib-out of each neighbor.
// -- curl -i -X GET http://<ownIP>:8080/v1/bgp/neighbor/<remote address of target neighbor>/adj-rib-out
// get local-rib of each neighbor.
// -- curl -i -X GET http://<ownIP>:8080/v1/bgp/neighbor/<remote address of target neighbor>/local-rib
func (rs *RestServer) Serve() {
neighbor := BASE_VERSION + NEIGHBOR
// neighbors := BASE_VERSION + NEIGHBORS
// adjRibIn := BASE_VERSION + ADJ_RIB_IN
// adjRibOut := BASE_VERSION + ADJ_RIB_OUT
// adjRibLocal := BASE_VERSION + ADJ_RIB_LOCAL
// adjRibLocalBest := BASE_VERSION + ADJ_RIB_LOCAL_BEST
r := mux.NewRouter()
// set URLs
// r.HandleFunc(neighbors, rs.Neighbors).Methods("GET")
r.HandleFunc(neighbor+"/{"+PARAM_REMOTE_PEER_ADDR+"}", rs.Neighbor).Methods("GET")
// r.HandleFunc(adjRibIn+"/{"+PARAM_REMOTE_PEER_ADDR+"}", rs.AdjRibIn).Methods("GET")
// r.HandleFunc(adjRibOut+"/{"+PARAM_REMOTE_PEER_ADDR+"}", rs.AdjRibOut).Methods("GET")
r.HandleFunc(neighbor+"/{"+PARAM_REMOTE_PEER_ADDR+"}/"+"local-rib", rs.NeighborLocalRib).Methods("GET")
// Handler when not found url
r.NotFoundHandler = http.HandlerFunc(NotFoundHandler)
http.Handle("/", r)
http.ListenAndServe(":"+strconv.Itoa(rs.port), nil)
}
// Http request of curl, return the json format infomation of neibor state.
func (rs *RestServer) Neighbor(w http.ResponseWriter, r *http.Request) {
// remotePeerAddr := mux.Vars(r)[PARAM_REMOTE_PEER_ADDR]
params := mux.Vars(r)
remoteAddr, found := params[PARAM_REMOTE_PEER_ADDR]
if !found {
errStr := "neighbor address is not specified"
log.Debug(errStr)
http.Error(w, errStr, http.StatusInternalServerError)
return
}
log.Debugf("Look up neighbor with the remote address : %v", remoteAddr)
//Send channel of request parameter.
req := NewRestRequest(REQ_NEIGHBOR, remoteAddr)
rs.bgpServerCh <- req
//Wait response
resInf := <-req.ResponseCh
if e := resInf.Err(); e != nil {
log.Debug(e.Error())
http.Error(w, e.Error(), http.StatusInternalServerError)
return
}
res := resInf.(*RestResponseNeighbor)
var jns []byte
var err error
switch JsonFormat {
case JSON_FORMATTED:
jns, err = json.MarshalIndent(res, "", " ") // formatted json
case JSON_UN_FORMATTED:
jns, err = json.Marshal(res) // Unformatted json
}
if err != nil {
errStr := fmt.Sprintf("Failed to perth json of neighbor state", remoteAddr)
log.Error(errStr)
http.Error(w, errStr, http.StatusInternalServerError)
return
}
w.Write(jns)
}
// TODO: merge the above function
func (rs *RestServer) NeighborLocalRib(w http.ResponseWriter, r *http.Request) {
params := mux.Vars(r)
remoteAddr, found := params[PARAM_REMOTE_PEER_ADDR]
if !found {
errStr := "neighbor address is not specified"
log.Debug(errStr)
http.Error(w, errStr, http.StatusInternalServerError)
return
}
log.Debugf("Look up neighbor with the remote address : %v", remoteAddr)
//Send channel of request parameter.
req := NewRestRequest(REQ_LOCAL_RIB, remoteAddr)
rs.bgpServerCh <- req
//Wait response
resInf := <-req.ResponseCh
if e := resInf.Err(); e != nil {
log.Debug(e.Error())
http.Error(w, e.Error(), http.StatusInternalServerError)
return
}
res := resInf.(*RestResponseDefault)
w.Write(res.Data)
}
func NotFoundHandler(w http.ResponseWriter, r *http.Request) {
http.Error(w, http.StatusText(http.StatusNotFound), http.StatusNotFound)
}
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