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Enable use of multiple point2pointipam chain elements (networkservice…
…mesh#912) Signed-off-by: Mikhail Avramenko <avramenkomihail15@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,133 @@ | ||
| // 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 onidle provides server chain element that executes a callback when there were no active connections for specified time | ||
| package onidle | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/golang/protobuf/ptypes/empty" | ||
| "github.com/networkservicemesh/api/pkg/api/networkservice" | ||
| "github.com/pkg/errors" | ||
|
|
||
| "github.com/networkservicemesh/sdk/pkg/networkservice/core/next" | ||
| "github.com/networkservicemesh/sdk/pkg/tools/clock" | ||
| ) | ||
|
|
||
| type onIdleServer struct { | ||
| ctx context.Context | ||
| timeout time.Duration | ||
| notify func() | ||
| timer clock.Timer | ||
| timerMut sync.Mutex | ||
| timerFired bool | ||
| activeConns map[string]struct{} | ||
| } | ||
|
|
||
| // NewServer returns a new server chain element that notifies about long time periods without active connections. | ||
| // | ||
| // If timeout passes, server calls specified notify function and all further Requests will fail. | ||
| // | ||
| // If ctx is canceled before timeout, the server stops monitoring connections without calling notify. | ||
| // Further calls to Request will not be affected by this. | ||
| func NewServer(ctx context.Context, notify func(), options ...Option) networkservice.NetworkServiceServer { | ||
| clockTime := clock.FromContext(ctx) | ||
|
|
||
| t := &onIdleServer{ | ||
| ctx: ctx, | ||
| timeout: time.Minute * 10, | ||
| notify: notify, | ||
| activeConns: make(map[string]struct{}), | ||
| } | ||
|
|
||
| for _, opt := range options { | ||
| opt(t) | ||
| } | ||
|
|
||
| t.timer = clockTime.AfterFunc(t.timeout, func() { | ||
| if ctx.Err() != nil { | ||
| return | ||
| } | ||
|
|
||
| t.timerMut.Lock() | ||
|
|
||
| if t.timerFired || len(t.activeConns) != 0 { | ||
| t.timerMut.Unlock() | ||
| return | ||
| } | ||
|
|
||
| t.timerFired = true | ||
| t.timerMut.Unlock() | ||
| t.notify() | ||
| }) | ||
|
|
||
| go func() { | ||
| <-t.ctx.Done() | ||
| t.timer.Stop() | ||
| }() | ||
|
|
||
| return t | ||
| } | ||
|
|
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| func (t *onIdleServer) Request(ctx context.Context, request *networkservice.NetworkServiceRequest) (*networkservice.Connection, error) { | ||
| isRefresh, expired := t.addConnection(request.GetConnection()) | ||
|
|
||
| if expired { | ||
| return nil, errors.New("endpoint expired") | ||
| } | ||
|
|
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| conn, err := next.Server(ctx).Request(ctx, request) | ||
| if err != nil && !isRefresh { | ||
| t.removeConnection(request.GetConnection()) | ||
| } | ||
|
|
||
| return conn, err | ||
| } | ||
|
|
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| func (t *onIdleServer) Close(ctx context.Context, conn *networkservice.Connection) (*empty.Empty, error) { | ||
| t.removeConnection(conn) | ||
| return next.Server(ctx).Close(ctx, conn) | ||
| } | ||
|
|
||
| func (t *onIdleServer) addConnection(conn *networkservice.Connection) (isRefresh, expired bool) { | ||
| t.timerMut.Lock() | ||
| defer t.timerMut.Unlock() | ||
|
|
||
| if t.timerFired { | ||
| return false, true | ||
| } | ||
|
|
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| if _, isRefresh = t.activeConns[conn.GetId()]; !isRefresh { | ||
| t.activeConns[conn.GetId()] = struct{}{} | ||
| t.timer.Stop() | ||
| } | ||
| return isRefresh, false | ||
| } | ||
|
|
||
| func (t *onIdleServer) removeConnection(conn *networkservice.Connection) { | ||
| t.timerMut.Lock() | ||
| defer t.timerMut.Unlock() | ||
|
|
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| if _, loaded := t.activeConns[conn.GetId()]; loaded { | ||
| delete(t.activeConns, conn.GetId()) | ||
| if len(t.activeConns) == 0 && t.ctx.Err() == nil { | ||
| t.timer.Reset(t.timeout) | ||
| } | ||
| } | ||
| } |
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