package states import ( "github.com/zclconf/go-cty/cty" ctyjson "github.com/zclconf/go-cty/cty/json" "github.com/hashicorp/terraform/addrs" ) // ResourceInstanceObject is the local representation of a specific remote // object associated with a resource instance. In practice not all remote // objects are actually remote in the sense of being accessed over the network, // but this is the most common case. // // It is not valid to mutate a ResourceInstanceObject once it has been created. // Instead, create a new object and replace the existing one. type ResourceInstanceObject struct { // Value is the object-typed value representing the remote object within // Terraform. Value cty.Value // Private is an opaque value set by the provider when this object was // last created or updated. Terraform Core does not use this value in // any way and it is not exposed anywhere in the user interface, so // a provider can use it for retaining any necessary private state. Private []byte // Status represents the "readiness" of the object as of the last time // it was updated. Status ObjectStatus // Dependencies is a set of absolute address to other resources this // instance dependeded on when it was applied. This is used to construct // the dependency relationships for an object whose configuration is no // longer available, such as if it has been removed from configuration // altogether, or is now deposed. Dependencies []addrs.AbsResource // CreateBeforeDestroy reflects the status of the lifecycle // create_before_destroy option when this instance was last updated. // Because create_before_destroy also effects the overall ordering of the // destroy operations, we need to record the status to ensure a resource // removed from the config will still be destroyed in the same manner. CreateBeforeDestroy bool // DependsOn corresponds to the deprecated `depends_on` field in the state. // This field contained the configuration `depends_on` values, and some of // the references from within a single module. DependsOn []addrs.Referenceable } // ObjectStatus represents the status of a RemoteObject. type ObjectStatus rune //go:generate go run golang.org/x/tools/cmd/stringer -type ObjectStatus const ( // ObjectReady is an object status for an object that is ready to use. ObjectReady ObjectStatus = 'R' // ObjectTainted is an object status representing an object that is in // an unrecoverable bad state due to a partial failure during a create, // update, or delete operation. Since it cannot be moved into the // ObjectRead state, a tainted object must be replaced. ObjectTainted ObjectStatus = 'T' // ObjectPlanned is a special object status used only for the transient // placeholder objects we place into state during the refresh and plan // walks to stand in for objects that will be created during apply. // // Any object of this status must have a corresponding change recorded // in the current plan, whose value must then be used in preference to // the value stored in state when evaluating expressions. A planned // object stored in state will be incomplete if any of its attributes are // not yet known, and the plan must be consulted in order to "see" those // unknown values, because the state is not able to represent them. ObjectPlanned ObjectStatus = 'P' ) // Encode marshals the value within the receiver to produce a // ResourceInstanceObjectSrc ready to be written to a state file. // // The given type must be the implied type of the resource type schema, and // the given value must conform to it. It is important to pass the schema // type and not the object's own type so that dynamically-typed attributes // will be stored correctly. The caller must also provide the version number // of the schema that the given type was derived from, which will be recorded // in the source object so it can be used to detect when schema migration is // required on read. // // The returned object may share internal references with the receiver and // so the caller must not mutate the receiver any further once once this // method is called. func (o *ResourceInstanceObject) Encode(ty cty.Type, schemaVersion uint64) (*ResourceInstanceObjectSrc, error) { // Our state serialization can't represent unknown values, so we convert // them to nulls here. This is lossy, but nobody should be writing unknown // values here and expecting to get them out again later. // // We get unknown values here while we're building out a "planned state" // during the plan phase, but the value stored in the plan takes precedence // for expression evaluation. The apply step should never produce unknown // values, but if it does it's the responsibility of the caller to detect // and raise an error about that. val := cty.UnknownAsNull(o.Value) src, err := ctyjson.Marshal(val, ty) if err != nil { return nil, err } return &ResourceInstanceObjectSrc{ SchemaVersion: schemaVersion, AttrsJSON: src, Private: o.Private, Status: o.Status, Dependencies: o.Dependencies, }, nil } // AsTainted returns a deep copy of the receiver with the status updated to // ObjectTainted. func (o *ResourceInstanceObject) AsTainted() *ResourceInstanceObject { if o == nil { // A nil object can't be tainted, but we'll allow this anyway to // avoid a crash, since we presumably intend to eventually record // the object has having been deleted anyway. return nil } ret := o.DeepCopy() ret.Status = ObjectTainted return ret }