90 lines
3.0 KiB
Go
90 lines
3.0 KiB
Go
package plans
|
|
|
|
import (
|
|
"fmt"
|
|
"sync"
|
|
|
|
"github.com/hashicorp/terraform/addrs"
|
|
"github.com/hashicorp/terraform/states"
|
|
)
|
|
|
|
// ChangesSync is a wrapper around a Changes that provides a concurrency-safe
|
|
// interface to insert new changes and retrieve copies of existing changes.
|
|
//
|
|
// Each ChangesSync is independent of all others, so all concurrent writers
|
|
// to a particular Changes must share a single ChangesSync. Behavior is
|
|
// undefined if any other caller makes changes to the underlying Changes
|
|
// object or its nested objects concurrently with any of the methods of a
|
|
// particular ChangesSync.
|
|
type ChangesSync struct {
|
|
lock sync.Mutex
|
|
changes *Changes
|
|
}
|
|
|
|
// AppendResourceInstanceChange records the given resource instance change in
|
|
// the set of planned resource changes.
|
|
//
|
|
// The caller must ensure that there are no concurrent writes to the given
|
|
// change while this method is running, but it is safe to resume mutating
|
|
// it after this method returns without affecting the saved change.
|
|
func (cs *ChangesSync) AppendResourceInstanceChange(changeSrc *ResourceInstanceChangeSrc) {
|
|
if cs == nil {
|
|
panic("AppendResourceInstanceChange on nil ChangesSync")
|
|
}
|
|
cs.lock.Lock()
|
|
defer cs.lock.Unlock()
|
|
|
|
s := changeSrc.DeepCopy()
|
|
cs.changes.Resources = append(cs.changes.Resources, s)
|
|
}
|
|
|
|
// GetResourceInstanceChange searches the set of resource instance changes for
|
|
// one matching the given address and generation, returning it if it exists.
|
|
//
|
|
// If no such change exists, nil is returned.
|
|
//
|
|
// The returned object is a deep copy of the change recorded in the plan, so
|
|
// callers may mutate it although it's generally better (less confusing) to
|
|
// treat planned changes as immutable after they've been initially constructed.
|
|
func (cs *ChangesSync) GetResourceInstanceChange(addr addrs.AbsResourceInstance, gen states.Generation) *ResourceInstanceChangeSrc {
|
|
if cs == nil {
|
|
panic("GetResourceInstanceChange on nil ChangesSync")
|
|
}
|
|
cs.lock.Lock()
|
|
defer cs.lock.Unlock()
|
|
|
|
if gen == states.CurrentGen {
|
|
return cs.changes.ResourceInstance(addr).DeepCopy()
|
|
}
|
|
if dk, ok := gen.(states.DeposedKey); ok {
|
|
return cs.changes.ResourceInstanceDeposed(addr, dk).DeepCopy()
|
|
}
|
|
panic(fmt.Sprintf("unsupported generation value %#v", gen))
|
|
}
|
|
|
|
// RemoveResourceInstanceChange searches the set of resource instance changes
|
|
// for one matching the given address and generation, and removes it from the
|
|
// set if it exists.
|
|
func (cs *ChangesSync) RemoveResourceInstanceChange(addr addrs.AbsResourceInstance, gen states.Generation) {
|
|
if cs == nil {
|
|
panic("RemoveResourceInstanceChange on nil ChangesSync")
|
|
}
|
|
cs.lock.Lock()
|
|
defer cs.lock.Unlock()
|
|
|
|
dk := states.NotDeposed
|
|
if realDK, ok := gen.(states.DeposedKey); ok {
|
|
dk = realDK
|
|
}
|
|
|
|
addrStr := addr.String()
|
|
for i, r := range cs.changes.Resources {
|
|
if r.Addr.String() != addrStr || r.DeposedKey != dk {
|
|
continue
|
|
}
|
|
copy(cs.changes.Resources[i:], cs.changes.Resources[i+1:])
|
|
cs.changes.Resources = cs.changes.Resources[:len(cs.changes.Resources)-1]
|
|
return
|
|
}
|
|
}
|