64449cddc1
Most allocation hooks don't need to know when a single task within the allocation is restarted. The check watcher for group services triggers the alloc runner to restart all tasks, but the alloc runner's `Restart` method doesn't trigger any of the alloc hooks, including the group service hook. The result is that after the first time a check triggers a restart, we'll never restart the tasks of an allocation again. This commit adds a `RunnerTaskRestartHook` interface so that alloc runner hooks can act if a task within the alloc is restarted. The only implementation is in the group service hook, which will force a re-registration of the alloc's services and fix check restarts.
73 lines
1.9 KiB
Go
73 lines
1.9 KiB
Go
package interfaces
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import (
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"github.com/hashicorp/nomad/nomad/structs"
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)
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// RunnnerHook is a lifecycle hook into the life cycle of an allocation runner.
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type RunnerHook interface {
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Name() string
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}
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// RunnerPrerunHooks are executed before calling TaskRunner.Run for
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// non-terminal allocations. Terminal allocations do *not* call prerun.
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type RunnerPrerunHook interface {
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RunnerHook
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Prerun() error
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}
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// RunnerPreKillHooks are executed inside of KillTasks before
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// iterating and killing each task. It will run before the Leader
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// task is killed.
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type RunnerPreKillHook interface {
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RunnerHook
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PreKill()
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}
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// RunnerPostrunHooks are executed after calling TaskRunner.Run, even for
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// terminal allocations. Therefore Postrun hooks must be safe to call without
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// first calling Prerun hooks.
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type RunnerPostrunHook interface {
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RunnerHook
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Postrun() error
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}
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// RunnerDestroyHooks are executed after AllocRunner.Run has exited and must
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// make a best effort cleanup allocation resources. Destroy hooks must be safe
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// to call without first calling Prerun.
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type RunnerDestroyHook interface {
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RunnerHook
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Destroy() error
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}
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// RunnerUpdateHooks are executed when an allocation update is received from
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// the server. Update is called concurrently with AllocRunner execution and
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// therefore must be safe for concurrent access with other hook methods. Calls
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// to Update are serialized so allocaiton updates will always be processed in
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// order.
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type RunnerUpdateHook interface {
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RunnerHook
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Update(*RunnerUpdateRequest) error
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}
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type RunnerUpdateRequest struct {
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Alloc *structs.Allocation
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}
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// RunnerTaskRestartHooks are executed just before the allocation runner is
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// going to restart all tasks.
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type RunnerTaskRestartHook interface {
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RunnerHook
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PreTaskRestart() error
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}
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// ShutdownHook may be implemented by AllocRunner or TaskRunner hooks and will
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// be called when the agent process is being shutdown gracefully.
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type ShutdownHook interface {
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RunnerHook
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Shutdown()
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}
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