d018fcbff7
Tools like `nomad-nodesim` are unable to implement a minimal implementation of an allocrunner so that we can test the client communication without having to lug around the entire allocrunner/taskrunner code base. The allocrunner was implemented with an interface specifically for this purpose, but there were circular imports that made it challenging to use in practice. Move the AllocRunner interface into an inner package and provide a factory function type. Provide a minimal test that exercises the new function so that consumers have some idea of what the minimum implementation required is.
36 lines
853 B
Go
36 lines
853 B
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package allocrunner
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import (
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"context"
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log "github.com/hashicorp/go-hclog"
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"github.com/hashicorp/nomad/client/config"
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)
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// upstreamAllocsHook waits for a PrevAllocWatcher to exit before allowing
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// an allocation to be executed
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type upstreamAllocsHook struct {
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allocWatcher config.PrevAllocWatcher
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logger log.Logger
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}
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func newUpstreamAllocsHook(logger log.Logger, allocWatcher config.PrevAllocWatcher) *upstreamAllocsHook {
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h := &upstreamAllocsHook{
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allocWatcher: allocWatcher,
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}
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h.logger = logger.Named(h.Name())
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return h
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}
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func (h *upstreamAllocsHook) Name() string {
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return "await_previous_allocations"
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}
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func (h *upstreamAllocsHook) Prerun() error {
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// Wait for a previous alloc - if any - to terminate
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return h.allocWatcher.Wait(context.Background())
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}
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