mirror of
https://github.com/opentofu/opentofu.git
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198 lines
9.2 KiB
Go
198 lines
9.2 KiB
Go
// Copyright (c) The OpenTofu Authors
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// SPDX-License-Identifier: MPL-2.0
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// Copyright (c) 2023 HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package tofu
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import (
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"github.com/zclconf/go-cty/cty"
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"github.com/opentofu/opentofu/internal/addrs"
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"github.com/opentofu/opentofu/internal/plans"
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"github.com/opentofu/opentofu/internal/providers"
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"github.com/opentofu/opentofu/internal/states"
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)
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// HookAction is an enum of actions that can be taken as a result of a hook
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// callback. This allows you to modify the behavior of OpenTofu at runtime.
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type HookAction byte
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const (
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// HookActionContinue continues with processing as usual.
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HookActionContinue HookAction = iota
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// HookActionHalt halts immediately: no more hooks are processed
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// and the action that OpenTofu was about to take is cancelled.
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HookActionHalt
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)
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// Hook is the interface that must be implemented to hook into various
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// parts of OpenTofu, allowing you to inspect or change behavior at runtime.
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//
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// There are MANY hook points into OpenTofu. If you only want to implement
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// some hook points, but not all (which is the likely case), then embed the
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// NilHook into your struct, which implements all of the interface but does
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// nothing. Then, override only the functions you want to implement.
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type Hook interface {
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// PreApply and PostApply are called before and after an action for a
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// single instance is applied. The error argument in PostApply is the
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// error, if any, that was returned from the provider Apply call itself.
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PreApply(addr addrs.AbsResourceInstance, gen states.Generation, action plans.Action, priorState, plannedNewState cty.Value) (HookAction, error)
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PostApply(addr addrs.AbsResourceInstance, gen states.Generation, newState cty.Value, err error) (HookAction, error)
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// PreDiff and PostDiff are called before and after a provider is given
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// the opportunity to customize the proposed new state to produce the
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// planned new state.
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PreDiff(addr addrs.AbsResourceInstance, gen states.Generation, priorState, proposedNewState cty.Value) (HookAction, error)
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PostDiff(addr addrs.AbsResourceInstance, gen states.Generation, action plans.Action, priorState, plannedNewState cty.Value) (HookAction, error)
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// The provisioning hooks signal both the overall start end end of
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// provisioning for a particular instance and of each of the individual
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// configured provisioners for each instance. The sequence of these
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// for a given instance might look something like this:
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//
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// PreProvisionInstance(aws_instance.foo[1], ...)
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// PreProvisionInstanceStep(aws_instance.foo[1], "file")
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// PostProvisionInstanceStep(aws_instance.foo[1], "file", nil)
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// PreProvisionInstanceStep(aws_instance.foo[1], "remote-exec")
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// ProvisionOutput(aws_instance.foo[1], "remote-exec", "Installing foo...")
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// ProvisionOutput(aws_instance.foo[1], "remote-exec", "Configuring bar...")
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// PostProvisionInstanceStep(aws_instance.foo[1], "remote-exec", nil)
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// PostProvisionInstance(aws_instance.foo[1], ...)
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//
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// ProvisionOutput is called with output sent back by the provisioners.
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// This will be called multiple times as output comes in, with each call
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// representing one line of output. It cannot control whether the
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// provisioner continues running.
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PreProvisionInstance(addr addrs.AbsResourceInstance, state cty.Value) (HookAction, error)
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PostProvisionInstance(addr addrs.AbsResourceInstance, state cty.Value) (HookAction, error)
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PreProvisionInstanceStep(addr addrs.AbsResourceInstance, typeName string) (HookAction, error)
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PostProvisionInstanceStep(addr addrs.AbsResourceInstance, typeName string, err error) (HookAction, error)
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ProvisionOutput(addr addrs.AbsResourceInstance, typeName string, line string)
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// PreRefresh and PostRefresh are called before and after a single
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// resource state is refreshed, respectively.
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PreRefresh(addr addrs.AbsResourceInstance, gen states.Generation, priorState cty.Value) (HookAction, error)
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PostRefresh(addr addrs.AbsResourceInstance, gen states.Generation, priorState cty.Value, newState cty.Value) (HookAction, error)
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// PreImportState and PostImportState are called before and after
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// (respectively) each state import operation for a given resource address when
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// using the legacy import command.
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PreImportState(addr addrs.AbsResourceInstance, importID string) (HookAction, error)
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PostImportState(addr addrs.AbsResourceInstance, imported []providers.ImportedResource) (HookAction, error)
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// PrePlanImport and PostPlanImport are called during a plan before and after planning to import
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// a new resource using the configuration-driven import workflow.
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PrePlanImport(addr addrs.AbsResourceInstance, importID string) (HookAction, error)
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PostPlanImport(addr addrs.AbsResourceInstance, imported []providers.ImportedResource) (HookAction, error)
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// PreApplyImport and PostApplyImport are called during an apply for each imported resource when
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// using the configuration-driven import workflow.
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PreApplyImport(addr addrs.AbsResourceInstance, importing plans.ImportingSrc) (HookAction, error)
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PostApplyImport(addr addrs.AbsResourceInstance, importing plans.ImportingSrc) (HookAction, error)
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// Stopping is called if an external signal requests that OpenTofu
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// gracefully abort an operation in progress.
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//
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// This notification might suggest that the user wants OpenTofu to exit
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// ASAP and in that case it's possible that if OpenTofu runs for too much
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// longer then it'll get killed un-gracefully, and so this hook could be
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// an opportunity to persist any transient data that would be lost under
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// a subsequent kill signal. However, implementations must take care to do
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// so in a way that won't cause corruption if the process _is_ killed while
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// this hook is still running.
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//
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// This hook cannot control whether OpenTofu continues, because the
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// graceful shutdown process is typically already running by the time this
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// function is called.
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Stopping()
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// PostStateUpdate is called each time the state is updated. It receives
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// a deep copy of the state, which it may therefore access freely without
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// any need for locks to protect from concurrent writes from the caller.
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PostStateUpdate(new *states.State) (HookAction, error)
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}
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// NilHook is a Hook implementation that does nothing. It exists only to
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// simplify implementing hooks. You can embed this into your Hook implementation
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// and only implement the functions you are interested in.
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type NilHook struct{}
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var _ Hook = (*NilHook)(nil)
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func (*NilHook) PreApply(addr addrs.AbsResourceInstance, gen states.Generation, action plans.Action, priorState, plannedNewState cty.Value) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (*NilHook) PostApply(addr addrs.AbsResourceInstance, gen states.Generation, newState cty.Value, err error) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (*NilHook) PreDiff(addr addrs.AbsResourceInstance, gen states.Generation, priorState, proposedNewState cty.Value) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (*NilHook) PostDiff(addr addrs.AbsResourceInstance, gen states.Generation, action plans.Action, priorState, plannedNewState cty.Value) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (*NilHook) PreProvisionInstance(addr addrs.AbsResourceInstance, state cty.Value) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (*NilHook) PostProvisionInstance(addr addrs.AbsResourceInstance, state cty.Value) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (*NilHook) PreProvisionInstanceStep(addr addrs.AbsResourceInstance, typeName string) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (*NilHook) PostProvisionInstanceStep(addr addrs.AbsResourceInstance, typeName string, err error) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (*NilHook) ProvisionOutput(addr addrs.AbsResourceInstance, typeName string, line string) {
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}
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func (*NilHook) PreRefresh(addr addrs.AbsResourceInstance, gen states.Generation, priorState cty.Value) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (*NilHook) PostRefresh(addr addrs.AbsResourceInstance, gen states.Generation, priorState cty.Value, newState cty.Value) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (*NilHook) PreImportState(addr addrs.AbsResourceInstance, importID string) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (*NilHook) PostImportState(addr addrs.AbsResourceInstance, imported []providers.ImportedResource) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (h *NilHook) PrePlanImport(addr addrs.AbsResourceInstance, importID string) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (h *NilHook) PostPlanImport(addr addrs.AbsResourceInstance, imported []providers.ImportedResource) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (h *NilHook) PreApplyImport(addr addrs.AbsResourceInstance, importing plans.ImportingSrc) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (h *NilHook) PostApplyImport(addr addrs.AbsResourceInstance, importing plans.ImportingSrc) (HookAction, error) {
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return HookActionContinue, nil
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}
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func (*NilHook) Stopping() {
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// Does nothing at all by default
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}
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func (*NilHook) PostStateUpdate(new *states.State) (HookAction, error) {
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return HookActionContinue, nil
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}
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