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34 lines
1.7 KiB
Go
34 lines
1.7 KiB
Go
// Package hooks implements pre- and post snapshot hooks.
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//
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// Plan is a generic executor for ExpectStepReports before and after an activity specified in a callback.
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// It provides a reporting facility that can be polled while the plan is executing to gather progress information.
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//
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// This package also provides all supported hook type implementations and abstractions around them.
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//
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// # Use For Other Kinds Of ExpectStepReports
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//
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// This package REQUIRES REFACTORING before it can be used for other activities than snapshots, e.g. pre- and post-replication:
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//
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// The Hook interface requires a hook to provide a Filesystems() filter, which doesn't make sense for
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// all kinds of activities.
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//
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// The hook implementations should move out of this package.
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// However, there is a lot of tight coupling which to untangle isn't worth it ATM.
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//
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// # How This Package Is Used By Package Snapper
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//
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// Deserialize a config.List using ListFromConfig().
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// Then it MUST filter the list to only contain hooks for a particular filesystem using
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// hooksList.CopyFilteredForFilesystem(fs).
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//
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// Then create a CallbackHook using NewCallbackHookForFilesystem().
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//
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// Pass all of the above to NewPlan() which provides a Report() and Run() method:
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//
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// Plan.Run(ctx context.Context,dryRun bool) executes the plan and take a context as argument that should contain a logger added using hooks.WithLogger()).
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// The value of dryRun is passed through to the hooks' Run() method.
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// Command hooks make it available in the environment variable ZREPL_DRYRUN.
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//
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// Plan.Report() can be called while Plan.Run() is executing to give an overview of plan execution progress (future use in "zrepl status").
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package hooks
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