64 lines
2.2 KiB
Go
64 lines
2.2 KiB
Go
package plans
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import (
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"fmt"
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"sync"
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"github.com/hashicorp/terraform/addrs"
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"github.com/hashicorp/terraform/states"
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)
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// ChangesSync is a wrapper around a Changes that provides a concurrency-safe
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// interface to insert new changes and retrieve copies of existing changes.
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//
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// Each ChangesSync is independent of all others, so all concurrent writers
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// to a particular Changes must share a single ChangesSync. Behavior is
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// undefined if any other caller makes changes to the underlying Changes
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// object or its nested objects concurrently with any of the methods of a
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// particular ChangesSync.
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type ChangesSync struct {
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lock sync.Mutex
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changes *Changes
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}
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// AppendResourceInstanceChange records the given resource instance change in
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// the set of planned resource changes.
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//
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// The caller must ensure that there are no concurrent writes to the given
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// change while this method is running, but it is safe to resume mutating
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// it after this method returns without affecting the saved change.
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func (cs *ChangesSync) AppendResourceInstanceChange(changeSrc *ResourceInstanceChangeSrc) {
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if cs == nil {
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panic("AppendResourceInstanceChange on nil ChangesSync")
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}
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cs.lock.Lock()
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defer cs.lock.Unlock()
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s := changeSrc.DeepCopy()
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cs.changes.Resources = append(cs.changes.Resources, s)
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}
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// GetResourceInstanceChange searches the set of resource instance changes for
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// one matching the given address and generation, returning it if it exists.
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//
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// If no such change exists, nil is returned.
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//
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// The returned object is a deep copy of the change recorded in the plan, so
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// callers may mutate it although it's generally better (less confusing) to
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// treat planned changes as immutable after they've been initially constructed.
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func (cs *ChangesSync) GetResourceInstanceChange(addr addrs.AbsResourceInstance, gen states.Generation) *ResourceInstanceChangeSrc {
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if cs == nil {
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panic("GetResourceInstanceChange on nil ChangesSync")
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}
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cs.lock.Lock()
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defer cs.lock.Unlock()
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if gen == states.CurrentGen {
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return cs.changes.ResourceInstance(addr)
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}
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if dk, ok := gen.(states.DeposedKey); ok {
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return cs.changes.ResourceInstanceDeposed(addr, dk)
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}
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panic(fmt.Sprintf("unsupported generation value %#v", gen))
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}
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