111 lines
2.5 KiB
Go
111 lines
2.5 KiB
Go
package allocrunner
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import (
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"context"
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"github.com/hashicorp/go-hclog"
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"github.com/hashicorp/nomad/nomad/structs"
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)
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// TaskHookCoordinator helps coordinate when main start tasks can launch
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// namely after all Prestart Tasks have run, and after all BlockUntilCompleted have completed
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type taskHookCoordinator struct {
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logger hclog.Logger
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closedCh chan struct{}
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mainTaskCtx context.Context
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mainTaskCtxCancel func()
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prestartSidecar map[string]struct{}
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prestartEphemeral map[string]struct{}
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}
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func newTaskHookCoordinator(logger hclog.Logger, tasks []*structs.Task) *taskHookCoordinator {
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closedCh := make(chan struct{})
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close(closedCh)
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mainTaskCtx, cancelFn := context.WithCancel(context.Background())
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c := &taskHookCoordinator{
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logger: logger,
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closedCh: closedCh,
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mainTaskCtx: mainTaskCtx,
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mainTaskCtxCancel: cancelFn,
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prestartSidecar: map[string]struct{}{},
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prestartEphemeral: map[string]struct{}{},
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}
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c.setTasks(tasks)
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return c
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}
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func (c *taskHookCoordinator) setTasks(tasks []*structs.Task) {
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for _, task := range tasks {
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if task.Lifecycle == nil {
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// move nothing
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continue
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}
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switch task.Lifecycle.Hook {
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case structs.TaskLifecycleHookPrestart:
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if task.Lifecycle.Sidecar {
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c.prestartSidecar[task.Name] = struct{}{}
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} else {
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c.prestartEphemeral[task.Name] = struct{}{}
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}
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default:
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c.logger.Error("invalid lifecycle hook", "hook", task.Lifecycle.Hook)
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}
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}
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if !c.hasPrestartTasks() {
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c.mainTaskCtxCancel()
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}
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}
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func (c *taskHookCoordinator) hasPrestartTasks() bool {
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return len(c.prestartSidecar)+len(c.prestartEphemeral) > 0
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}
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func (c *taskHookCoordinator) startConditionForTask(task *structs.Task) <-chan struct{} {
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if task.Lifecycle != nil && task.Lifecycle.Hook == structs.TaskLifecycleHookPrestart {
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return c.closedCh
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}
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return c.mainTaskCtx.Done()
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}
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// This is not thread safe! This must only be called from one thread per alloc runner.
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func (c *taskHookCoordinator) taskStateUpdated(states map[string]*structs.TaskState) {
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if c.mainTaskCtx.Err() != nil {
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// nothing to do here
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return
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}
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for task := range c.prestartSidecar {
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st := states[task]
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if st == nil || st.StartedAt.IsZero() {
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continue
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}
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delete(c.prestartSidecar, task)
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}
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for task := range c.prestartEphemeral {
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st := states[task]
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if st == nil || !st.Successful() {
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continue
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}
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delete(c.prestartEphemeral, task)
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}
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// everything well
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if !c.hasPrestartTasks() {
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c.mainTaskCtxCancel()
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}
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}
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