| /* |
| Copyright 2016 The Kubernetes Authors. |
| |
| 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 term |
| |
| import ( |
| "time" |
| |
| "k8s.io/apimachinery/pkg/util/runtime" |
| "k8s.io/client-go/tools/remotecommand" |
| ) |
| |
| // monitorResizeEvents spawns a goroutine that periodically gets the terminal size and tries to send |
| // it to the resizeEvents channel if the size has changed. The goroutine stops when the stop channel |
| // is closed. |
| func monitorResizeEvents(fd uintptr, resizeEvents chan<- remotecommand.TerminalSize, stop chan struct{}) { |
| go func() { |
| defer runtime.HandleCrash() |
| |
| size := GetSize(fd) |
| if size == nil { |
| return |
| } |
| lastSize := *size |
| |
| for { |
| // see if we need to stop running |
| select { |
| case <-stop: |
| return |
| default: |
| } |
| |
| size := GetSize(fd) |
| if size == nil { |
| return |
| } |
| |
| if size.Height != lastSize.Height || size.Width != lastSize.Width { |
| lastSize.Height = size.Height |
| lastSize.Width = size.Width |
| resizeEvents <- *size |
| } |
| |
| // sleep to avoid hot looping |
| time.Sleep(250 * time.Millisecond) |
| } |
| }() |
| } |