026896ac4c
In all of the examples, its recommended to call `Wait()` before starting
a process/task.
Since `Wait()` is a blocking call, this means it must be called from a
goroutine like so:
```go
statusC := make(chan uint32)
go func() {
status, err := task.Wait(ctx)
if err != nil {
// handle async err
}
statusC <- status
}()
task.Start(ctx)
<-statusC
```
This means there is a race here where there is no guarentee when the
goroutine is going to be scheduled, and even a bit more since this
requires an RPC call to be made.
In addition, this code is very messy and a common pattern for any caller
using Wait+Start.
Instead, this changes `Wait()` to use an async model having `Wait()`
return a channel instead of the code itself.
This ensures that when `Wait()` returns that the client has a handle on
the event stream (already made the RPC request) before returning and
reduces any sort of race to how the stream is handled by grpc since we
can't guarentee that we have a goroutine running and blocked on
`Recv()`.
Making `Wait()` async also cleans up the code in the caller drastically:
```go
statusC, err := task.Wait(ctx)
if err != nil {
return err
}
task.Start(ctx)
status := <-statusC
if status.Err != nil {
return err
}
```
No more spinning up goroutines and more natural error
handling for the caller.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
266 lines
4.6 KiB
Go
266 lines
4.6 KiB
Go
// +build !windows
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package containerd
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import (
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"syscall"
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"testing"
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)
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func TestCheckpointRestore(t *testing.T) {
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if !supportsCriu {
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t.Skip("system does not have criu installed")
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}
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client, err := newClient(t, address)
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if err != nil {
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t.Fatal(err)
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}
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defer client.Close()
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var (
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ctx, cancel = testContext()
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id = t.Name()
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)
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defer cancel()
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image, err := client.GetImage(ctx, testImage)
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if err != nil {
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t.Error(err)
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return
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}
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spec, err := GenerateSpec(WithImageConfig(ctx, image), WithProcessArgs("sleep", "100"))
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if err != nil {
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t.Error(err)
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return
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}
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container, err := client.NewContainer(ctx, id, WithSpec(spec), WithNewSnapshot(id, image))
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if err != nil {
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t.Error(err)
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return
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}
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defer container.Delete(ctx, WithSnapshotCleanup)
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task, err := container.NewTask(ctx, empty())
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if err != nil {
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t.Error(err)
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return
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}
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defer task.Delete(ctx)
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statusC, err := task.Wait(ctx)
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if err != nil {
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t.Error(err)
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return
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}
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if err := task.Start(ctx); err != nil {
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t.Error(err)
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return
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}
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checkpoint, err := task.Checkpoint(ctx, WithExit)
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if err != nil {
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t.Error(err)
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return
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}
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<-statusC
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if _, err := task.Delete(ctx); err != nil {
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t.Error(err)
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return
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}
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if task, err = container.NewTask(ctx, empty(), WithTaskCheckpoint(checkpoint)); err != nil {
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t.Error(err)
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return
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}
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defer task.Delete(ctx)
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statusC, err = task.Wait(ctx)
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if err != nil {
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t.Error(err)
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return
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}
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if err := task.Start(ctx); err != nil {
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t.Error(err)
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return
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}
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if err := task.Kill(ctx, syscall.SIGKILL); err != nil {
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t.Error(err)
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return
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}
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<-statusC
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}
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func TestCheckpointRestoreNewContainer(t *testing.T) {
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if !supportsCriu {
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t.Skip("system does not have criu installed")
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}
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client, err := newClient(t, address)
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if err != nil {
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t.Fatal(err)
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}
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defer client.Close()
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id := t.Name()
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ctx, cancel := testContext()
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defer cancel()
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image, err := client.GetImage(ctx, testImage)
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if err != nil {
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t.Error(err)
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return
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}
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spec, err := GenerateSpec(WithImageConfig(ctx, image), WithProcessArgs("sleep", "100"))
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if err != nil {
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t.Error(err)
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return
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}
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container, err := client.NewContainer(ctx, id, WithSpec(spec), WithNewSnapshot(id, image))
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if err != nil {
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t.Error(err)
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return
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}
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defer container.Delete(ctx, WithSnapshotCleanup)
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task, err := container.NewTask(ctx, empty())
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if err != nil {
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t.Error(err)
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return
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}
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defer task.Delete(ctx)
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statusC, err := task.Wait(ctx)
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if err != nil {
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t.Error(err)
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return
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}
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if err := task.Start(ctx); err != nil {
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t.Error(err)
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return
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}
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checkpoint, err := task.Checkpoint(ctx, WithExit)
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if err != nil {
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t.Error(err)
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return
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}
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<-statusC
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if _, err := task.Delete(ctx); err != nil {
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t.Error(err)
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return
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}
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if err := container.Delete(ctx, WithSnapshotCleanup); err != nil {
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t.Error(err)
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return
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}
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if container, err = client.NewContainer(ctx, id, WithCheckpoint(checkpoint, id)); err != nil {
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t.Error(err)
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return
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}
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if task, err = container.NewTask(ctx, empty(), WithTaskCheckpoint(checkpoint)); err != nil {
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t.Error(err)
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return
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}
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defer task.Delete(ctx)
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statusC, err = task.Wait(ctx)
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if err != nil {
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t.Error(err)
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return
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}
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if err := task.Start(ctx); err != nil {
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t.Error(err)
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return
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}
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if err := task.Kill(ctx, syscall.SIGKILL); err != nil {
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t.Error(err)
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return
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}
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<-statusC
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}
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func TestCheckpointLeaveRunning(t *testing.T) {
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if testing.Short() {
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t.Skip()
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}
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if !supportsCriu {
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t.Skip("system does not have criu installed")
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}
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client, err := New(address)
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if err != nil {
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t.Fatal(err)
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}
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defer client.Close()
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var (
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ctx, cancel = testContext()
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id = t.Name()
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)
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defer cancel()
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image, err := client.GetImage(ctx, testImage)
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if err != nil {
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t.Error(err)
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return
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}
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spec, err := GenerateSpec(WithImageConfig(ctx, image), WithProcessArgs("sleep", "100"))
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if err != nil {
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t.Error(err)
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return
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}
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container, err := client.NewContainer(ctx, id, WithSpec(spec), WithNewSnapshot(id, image))
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if err != nil {
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t.Error(err)
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return
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}
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defer container.Delete(ctx, WithSnapshotCleanup)
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task, err := container.NewTask(ctx, empty())
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if err != nil {
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t.Error(err)
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return
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}
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defer task.Delete(ctx)
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statusC, err := task.Wait(ctx)
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if err != nil {
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t.Error(err)
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return
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}
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if err := task.Start(ctx); err != nil {
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t.Error(err)
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return
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}
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if _, err := task.Checkpoint(ctx); err != nil {
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t.Error(err)
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return
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}
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status, err := task.Status(ctx)
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if err != nil {
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t.Error(err)
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return
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}
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if status.Status != Running {
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t.Errorf("expected status %q but received %q", Running, status)
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return
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}
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if err := task.Kill(ctx, syscall.SIGKILL); err != nil {
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t.Error(err)
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return
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}
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<-statusC
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}
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