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listener.go
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listener.go
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package skel
import (
"encoding/json"
"fmt"
"net"
"net/http"
"github.com/gorilla/mux"
"github.com/docker/libnetwork/drivers/remote/api"
"github.com/docker/libnetwork/ipamapi"
iapi "github.com/docker/libnetwork/ipams/remote/api"
)
const (
networkReceiver = "NetworkDriver"
ipamReceiver = ipamapi.PluginEndpointType
)
type Driver interface {
GetCapabilities() (*api.GetCapabilityResponse, error)
CreateNetwork(create *api.CreateNetworkRequest) error
DeleteNetwork(delete *api.DeleteNetworkRequest) error
CreateEndpoint(create *api.CreateEndpointRequest) (*api.CreateEndpointResponse, error)
DeleteEndpoint(delete *api.DeleteEndpointRequest) error
EndpointInfo(req *api.EndpointInfoRequest) (*api.EndpointInfoResponse, error)
JoinEndpoint(j *api.JoinRequest) (response *api.JoinResponse, error error)
LeaveEndpoint(leave *api.LeaveRequest) error
DiscoverNew(discover *api.DiscoveryNotification) error
DiscoverDelete(delete *api.DiscoveryNotification) error
}
type listener struct {
d Driver
i ipamapi.Ipam
}
func Listen(socket net.Listener, driver Driver, ipamDriver ipamapi.Ipam) error {
router := mux.NewRouter()
router.NotFoundHandler = http.HandlerFunc(notFound)
listener := &listener{driver, ipamDriver}
router.Methods("POST").Path("/Plugin.Activate").HandlerFunc(listener.handshake)
handleMethod := func(receiver, method string, h http.HandlerFunc) {
router.Methods("POST").Path(fmt.Sprintf("/%s.%s", receiver, method)).HandlerFunc(h)
}
handleMethod(networkReceiver, "GetCapabilities", listener.getCapabilities)
if driver != nil {
handleMethod(networkReceiver, "CreateNetwork", listener.createNetwork)
handleMethod(networkReceiver, "DeleteNetwork", listener.deleteNetwork)
handleMethod(networkReceiver, "CreateEndpoint", listener.createEndpoint)
handleMethod(networkReceiver, "DeleteEndpoint", listener.deleteEndpoint)
handleMethod(networkReceiver, "EndpointOperInfo", listener.infoEndpoint)
handleMethod(networkReceiver, "Join", listener.joinEndpoint)
handleMethod(networkReceiver, "Leave", listener.leaveEndpoint)
}
if ipamDriver != nil {
handleMethod(ipamReceiver, "GetDefaultAddressSpaces", listener.getDefaultAddressSpaces)
handleMethod(ipamReceiver, "RequestPool", listener.requestPool)
handleMethod(ipamReceiver, "ReleasePool", listener.releasePool)
handleMethod(ipamReceiver, "RequestAddress", listener.requestAddress)
handleMethod(ipamReceiver, "ReleaseAddress", listener.releaseAddress)
}
return http.Serve(socket, router)
}
func decode(w http.ResponseWriter, r *http.Request, v interface{}) error {
err := json.NewDecoder(r.Body).Decode(v)
if err != nil {
sendError(w, "Unable to decode JSON payload: "+err.Error(), http.StatusBadRequest)
}
return err
}
// === protocol handlers
type handshakeResp struct {
Implements []string
}
func (listener *listener) handshake(w http.ResponseWriter, r *http.Request) {
var resp handshakeResp
if listener.d != nil {
resp.Implements = append(resp.Implements, "NetworkDriver")
}
if listener.i != nil {
resp.Implements = append(resp.Implements, "IpamDriver")
}
err := json.NewEncoder(w).Encode(&resp)
if err != nil {
sendError(w, "encode error", http.StatusInternalServerError)
return
}
}
func (listener *listener) getCapabilities(w http.ResponseWriter, r *http.Request) {
caps, err := listener.d.GetCapabilities()
objectOrErrorResponse(w, caps, err)
}
func (listener *listener) createNetwork(w http.ResponseWriter, r *http.Request) {
var create api.CreateNetworkRequest
err := json.NewDecoder(r.Body).Decode(&create)
if err != nil {
sendError(w, "Unable to decode JSON payload: "+err.Error(), http.StatusBadRequest)
return
}
emptyOrErrorResponse(w, listener.d.CreateNetwork(&create))
}
func (listener *listener) deleteNetwork(w http.ResponseWriter, r *http.Request) {
var delete api.DeleteNetworkRequest
if err := json.NewDecoder(r.Body).Decode(&delete); err != nil {
sendError(w, "Unable to decode JSON payload: "+err.Error(), http.StatusBadRequest)
return
}
emptyOrErrorResponse(w, listener.d.DeleteNetwork(&delete))
}
func (listener *listener) createEndpoint(w http.ResponseWriter, r *http.Request) {
var create api.CreateEndpointRequest
if err := json.NewDecoder(r.Body).Decode(&create); err != nil {
sendError(w, "unable to decode JSON payload: "+err.Error(), http.StatusBadRequest)
return
}
res, err := listener.d.CreateEndpoint(&create)
objectOrErrorResponse(w, res, err)
}
func (listener *listener) deleteEndpoint(w http.ResponseWriter, r *http.Request) {
var delete api.DeleteEndpointRequest
if err := json.NewDecoder(r.Body).Decode(&delete); err != nil {
sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
return
}
emptyOrErrorResponse(w, listener.d.DeleteEndpoint(&delete))
}
func (listener *listener) infoEndpoint(w http.ResponseWriter, r *http.Request) {
var req api.EndpointInfoRequest
if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
return
}
info, err := listener.d.EndpointInfo(&req)
objectOrErrorResponse(w, info, err)
}
func (listener *listener) joinEndpoint(w http.ResponseWriter, r *http.Request) {
var join api.JoinRequest
if err := json.NewDecoder(r.Body).Decode(&join); err != nil {
sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
return
}
res, err := listener.d.JoinEndpoint(&join)
objectOrErrorResponse(w, res, err)
}
func (listener *listener) leaveEndpoint(w http.ResponseWriter, r *http.Request) {
var l api.LeaveRequest
if err := json.NewDecoder(r.Body).Decode(&l); err != nil {
sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
return
}
emptyOrErrorResponse(w, listener.d.LeaveEndpoint(&l))
}
func (listener *listener) discoverNew(w http.ResponseWriter, r *http.Request) {
var disco api.DiscoveryNotification
if err := json.NewDecoder(r.Body).Decode(&disco); err != nil {
sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
return
}
emptyOrErrorResponse(w, listener.d.DiscoverNew(&disco))
}
func (listener *listener) discoverDelete(w http.ResponseWriter, r *http.Request) {
var disco api.DiscoveryNotification
if err := json.NewDecoder(r.Body).Decode(&disco); err != nil {
sendError(w, "Could not decode JSON encode payload", http.StatusBadRequest)
return
}
emptyOrErrorResponse(w, listener.d.DiscoverDelete(&disco))
}
// ===
func (listener *listener) getDefaultAddressSpaces(w http.ResponseWriter, r *http.Request) {
local, global, err := listener.i.GetDefaultAddressSpaces()
response := &iapi.GetAddressSpacesResponse{
LocalDefaultAddressSpace: local,
GlobalDefaultAddressSpace: global,
}
objectOrErrorResponse(w, response, err)
}
func (listener *listener) requestPool(w http.ResponseWriter, r *http.Request) {
var rq iapi.RequestPoolRequest
if err := decode(w, r, &rq); err != nil {
return
}
poolID, pool, data, err := listener.i.RequestPool(rq.AddressSpace, rq.Pool, rq.SubPool, rq.Options, rq.V6)
if err != nil {
errorResponse(w, err.Error())
return
}
response := &iapi.RequestPoolResponse{
PoolID: poolID,
Pool: pool.String(),
Data: data,
}
objectResponse(w, response)
}
func (listener *listener) releasePool(w http.ResponseWriter, r *http.Request) {
var rq iapi.ReleasePoolRequest
if err := decode(w, r, &rq); err != nil {
return
}
err := listener.i.ReleasePool(rq.PoolID)
emptyOrErrorResponse(w, err)
}
func (listener *listener) requestAddress(w http.ResponseWriter, r *http.Request) {
var rq iapi.RequestAddressRequest
if err := decode(w, r, &rq); err != nil {
return
}
address, data, err := listener.i.RequestAddress(rq.PoolID, net.ParseIP(rq.Address), rq.Options)
if err != nil {
errorResponse(w, err.Error())
return
}
response := &iapi.RequestAddressResponse{
Address: address.String(),
Data: data,
}
objectResponse(w, response)
}
func (listener *listener) releaseAddress(w http.ResponseWriter, r *http.Request) {
var rq iapi.ReleaseAddressRequest
if err := decode(w, r, &rq); err != nil {
return
}
err := listener.i.ReleaseAddress(rq.PoolID, net.ParseIP(rq.Address))
emptyOrErrorResponse(w, err)
}
// ===
func notFound(w http.ResponseWriter, r *http.Request) {
http.NotFound(w, r)
}
func sendError(w http.ResponseWriter, msg string, code int) {
http.Error(w, msg, code)
}
func errorResponse(w http.ResponseWriter, fmtString string, item ...interface{}) {
w.WriteHeader(http.StatusInternalServerError)
json.NewEncoder(w).Encode(map[string]string{
"Err": fmt.Sprintf(fmtString, item...),
})
}
func objectResponse(w http.ResponseWriter, obj interface{}) {
if err := json.NewEncoder(w).Encode(obj); err != nil {
sendError(w, "Could not JSON encode response", http.StatusInternalServerError)
return
}
}
func emptyResponse(w http.ResponseWriter) {
json.NewEncoder(w).Encode(map[string]string{})
}
func objectOrErrorResponse(w http.ResponseWriter, obj interface{}, err error) {
if err != nil {
errorResponse(w, err.Error())
return
}
objectResponse(w, obj)
}
func emptyOrErrorResponse(w http.ResponseWriter, err error) {
if err != nil {
errorResponse(w, err.Error())
return
}
emptyResponse(w)
}