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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| package netsvcmonitor | ||
|
|
||
| import ( | ||
| "context" | ||
|
|
||
| "github.com/networkservicemesh/sdk/pkg/networkservice/utils/metadata" | ||
| ) | ||
|
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| type cancelFunctionKey struct{} | ||
|
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| func storeCancelFunction(ctx context.Context, cancel func()) { | ||
| metadata.Map(ctx, false).Store(cancelFunctionKey{}, cancel) | ||
| } | ||
| func loadCancelFunction(ctx context.Context) (func(), bool) { | ||
| v, ok := metadata.Map(ctx, false).Load(cancelFunctionKey{}) | ||
| if ok { | ||
| return v.(func()), true | ||
| } | ||
| return nil, false | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,164 @@ | ||
| // Copyright (c) 2020-2022 Cisco Systems, Inc. | ||
| // | ||
| // Copyright (c) 2021-2022 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. | ||
|
|
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| // Package monitor provides a NetworkServiceServer chain element to provide a monitor server that reflects | ||
| // the connections actually in the NetworkServiceServer | ||
| package netsvcmonitor | ||
|
|
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| import ( | ||
| "context" | ||
| "time" | ||
|
|
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| "github.com/golang/protobuf/ptypes/empty" | ||
|
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| "github.com/networkservicemesh/api/pkg/api/networkservice" | ||
| "github.com/networkservicemesh/api/pkg/api/registry" | ||
|
|
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| "github.com/networkservicemesh/sdk/pkg/networkservice/core/next" | ||
| "github.com/networkservicemesh/sdk/pkg/tools/log" | ||
| "github.com/networkservicemesh/sdk/pkg/tools/matchutils" | ||
| ) | ||
|
|
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| type Sender interface { | ||
| Send(event *networkservice.ConnectionEvent) (err error) | ||
| } | ||
|
|
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| type monitorServer struct { | ||
| chainCtx context.Context | ||
| s *networkservice.MonitorConnectionServer | ||
| nsClient registry.NetworkServiceRegistryClient | ||
| nseClient registry.NetworkServiceEndpointRegistryClient | ||
| } | ||
|
|
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| func NewServer(chainCtx context.Context, nsClient registry.NetworkServiceRegistryClient, nseClient registry.NetworkServiceEndpointRegistryClient, s *networkservice.MonitorConnectionServer) networkservice.NetworkServiceServer { | ||
| return &monitorServer{ | ||
| chainCtx: chainCtx, | ||
| nsClient: nsClient, | ||
| nseClient: nseClient, | ||
| s: s, | ||
| } | ||
| } | ||
|
|
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| func (m *monitorServer) Request(ctx context.Context, request *networkservice.NetworkServiceRequest) (*networkservice.Connection, error) { | ||
| if cancel, ok := loadCancelFunction(ctx); ok { | ||
| cancel() | ||
| } | ||
|
|
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| resp, err := next.Server(ctx).Request(ctx, request) | ||
|
|
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| if err != nil { | ||
| return resp, err | ||
| } | ||
|
|
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| var monitorCtx, cancel = context.WithCancel(context.Background()) | ||
|
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| storeCancelFunction(ctx, cancel) | ||
|
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| var logger = log.FromContext(ctx).WithField("monitorServer", "Find") | ||
|
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| var monitorNetworkServiceGoroutine func() | ||
|
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| monitorNetworkServiceGoroutine = func() { | ||
| var errorsLimit = 100 | ||
| var stream registry.NetworkServiceRegistry_FindClient | ||
| var err error | ||
| for errorsLimit > 0 { | ||
| if monitorCtx.Err() != nil { | ||
| return | ||
| } | ||
| stream, err = m.nsClient.Find(monitorCtx, ®istry.NetworkServiceQuery{ | ||
| Watch: true, | ||
| NetworkService: ®istry.NetworkService{ | ||
| Name: resp.GetNetworkService(), | ||
| }, | ||
| }) | ||
|
|
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| if err != nil { | ||
| logger.Errorf("an error happened during finding network service: %v", err.Error()) | ||
| errorsLimit-- | ||
| time.Sleep(time.Millisecond * 100) | ||
| continue | ||
| } | ||
| break | ||
| } | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
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| var networkServiceCh = registry.ReadNetworkServiceChannel(stream) | ||
|
|
||
| for { | ||
| select { | ||
| case <-monitorCtx.Done(): | ||
| return | ||
| case netsvc, ok := <-networkServiceCh: | ||
| if !ok { | ||
| if monitorCtx.Err() == nil { | ||
| //go monitorNetworkServiceGoroutine() | ||
| } | ||
| return | ||
| } | ||
| if monitorCtx.Err() != nil { | ||
| return | ||
| } | ||
|
|
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| nseStream, err := m.nseClient.Find(monitorCtx, ®istry.NetworkServiceEndpointQuery{ | ||
| NetworkServiceEndpoint: ®istry.NetworkServiceEndpoint{ | ||
| Name: resp.GetNetworkServiceEndpointName(), | ||
| }, | ||
| }) | ||
| if err != nil { | ||
| logger.Errorf("an error happened during finding nse: %v", err.Error()) | ||
| if monitorCtx.Err() == nil { | ||
| //go monitorNetworkServiceGoroutine() | ||
| } | ||
| return | ||
| } | ||
|
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| var nses = registry.ReadNetworkServiceEndpointList(nseStream) | ||
|
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| if len(matchutils.MatchEndpoint(resp.GetLabels(), netsvc.NetworkService, nses...)) == 0 { | ||
| if v, ok := (*m.s).(Sender); ok { | ||
| v.Send(&networkservice.ConnectionEvent{ | ||
| Type: networkservice.ConnectionEventType_DELETE, | ||
| Connections: map[string]*networkservice.Connection{ | ||
| resp.GetId(): request.GetConnection(), | ||
| }, | ||
| }) | ||
| } | ||
|
|
||
| } | ||
| } | ||
| time.Sleep(time.Millisecond * 50) | ||
| } | ||
|
|
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| } | ||
|
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| go monitorNetworkServiceGoroutine() | ||
|
|
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| return resp, err | ||
|
|
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| } | ||
|
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| func (m *monitorServer) Close(ctx context.Context, conn *networkservice.Connection) (*empty.Empty, error) { | ||
| if cancel, ok := loadCancelFunction(ctx); ok { | ||
| cancel() | ||
| } | ||
|
|
||
| return next.Server(ctx).Close(ctx, conn) | ||
| } |
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