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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| // Copyright (c) 2021 Doc.ai and/or its affiliates. | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // | ||
| // 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 swapip allows to replace internal NSE address to external for register/unregister/find queries. | ||
| package swapip | ||
|
|
||
| import ( | ||
| "context" | ||
| "net" | ||
| "net/url" | ||
| "sync/atomic" | ||
|
|
||
| "github.com/golang/protobuf/ptypes/empty" | ||
| "github.com/networkservicemesh/api/pkg/api/registry" | ||
|
|
||
| "github.com/networkservicemesh/sdk/pkg/registry/core/next" | ||
| "github.com/networkservicemesh/sdk/pkg/tools/log" | ||
| ) | ||
|
|
||
| type swapIPFindNSEServer struct { | ||
| registry.NetworkServiceEndpointRegistry_FindServer | ||
| m map[string]string | ||
| ctx context.Context | ||
| } | ||
|
|
||
| func (s *swapIPFindNSEServer) Send(nse *registry.NetworkServiceEndpoint) error { | ||
| trySwapIP(s.ctx, nse, s.m) | ||
| return s.NetworkServiceEndpointRegistry_FindServer.Send(nse) | ||
| } | ||
|
|
||
| type swapIPNSEServer struct { | ||
| swapIPMap *atomic.Value | ||
| } | ||
|
|
||
| func (n *swapIPNSEServer) Register(ctx context.Context, nse *registry.NetworkServiceEndpoint) (*registry.NetworkServiceEndpoint, error) { | ||
| m := n.swapIPMap.Load().(map[string]string) | ||
| trySwapIP(ctx, nse, m) | ||
| resp, err := next.NetworkServiceEndpointRegistryServer(ctx).Register(ctx, nse) | ||
| if err == nil { | ||
| trySwapIP(ctx, resp, m) | ||
| } | ||
| return resp, err | ||
| } | ||
|
|
||
| func (n *swapIPNSEServer) Find(query *registry.NetworkServiceEndpointQuery, server registry.NetworkServiceEndpointRegistry_FindServer) error { | ||
| m := n.swapIPMap.Load().(map[string]string) | ||
| trySwapIP(server.Context(), query.NetworkServiceEndpoint, m) | ||
| return next.NetworkServiceEndpointRegistryServer(server.Context()).Find(query, &swapIPFindNSEServer{NetworkServiceEndpointRegistry_FindServer: server, m: m, ctx: server.Context()}) | ||
| } | ||
|
|
||
| func (n *swapIPNSEServer) Unregister(ctx context.Context, nse *registry.NetworkServiceEndpoint) (*empty.Empty, error) { | ||
| m := n.swapIPMap.Load().(map[string]string) | ||
| trySwapIP(ctx, nse, m) | ||
| return next.NetworkServiceEndpointRegistryServer(ctx).Unregister(ctx, nse) | ||
| } | ||
|
|
||
| func trySwapIP(ctx context.Context, nse *registry.NetworkServiceEndpoint, ipMap map[string]string) { | ||
| logger := log.FromContext(ctx) | ||
|
|
||
| u, err := url.Parse(nse.Url) | ||
| defer func() { | ||
| if err != nil { | ||
| logger.Debugf("can not parse incomming url: %v, err: %v", nse.Url, err) | ||
| } | ||
| }() | ||
|
|
||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| h, p, err := net.SplitHostPort(u.Host) | ||
|
|
||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| if v, ok := ipMap[h]; ok { | ||
| logger.Debugf("swapping %v to %v", h, v) | ||
| u.Host = net.JoinHostPort(v, p) | ||
| nse.Url = u.String() | ||
| } | ||
| } | ||
|
|
||
| // NewNetworkServiceEndpointRegistryServer creates a new seturl registry.NetworkServiceEndpointRegistryServer | ||
| func NewNetworkServiceEndpointRegistryServer(updateMapCh <-chan map[string]string) registry.NetworkServiceEndpointRegistryServer { | ||
| var v = new(atomic.Value) | ||
| v.Store(map[string]string{}) | ||
|
|
||
| go func() { | ||
| for m := range updateMapCh { | ||
| v.Store(m) | ||
| } | ||
| }() | ||
|
|
||
| return &swapIPNSEServer{ | ||
| swapIPMap: v, | ||
| } | ||
| } |
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