116 lines
4.8 KiB
Go
116 lines
4.8 KiB
Go
package terraform
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import (
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"fmt"
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"log"
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"github.com/hashicorp/terraform/addrs"
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"github.com/hashicorp/terraform/configs/configschema"
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"github.com/hashicorp/terraform/providers"
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"github.com/hashicorp/terraform/states"
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"github.com/hashicorp/terraform/tfdiags"
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)
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// UpgradeResourceState will, if necessary, run the provider-defined upgrade
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// logic against the given state object to make it compliant with the
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// current schema version. This is a no-op if the given state object is
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// already at the latest version.
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//
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// If any errors occur during upgrade, error diagnostics are returned. In that
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// case it is not safe to proceed with using the original state object.
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func UpgradeResourceState(addr addrs.AbsResourceInstance, provider providers.Interface, src *states.ResourceInstanceObjectSrc, currentSchema *configschema.Block, currentVersion uint64) (*states.ResourceInstanceObjectSrc, tfdiags.Diagnostics) {
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currentTy := currentSchema.ImpliedType()
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// If the state is currently in flatmap format and the current schema
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// contains DynamicPseudoType attributes then we won't be able to convert
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// it to JSON without the provider's help even if the schema version matches,
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// since only the provider knows how to interpret the dynamic attribute
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// value in flatmap format to convert it to JSON.
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schemaHasDynamic := currentTy.HasDynamicTypes()
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stateIsFlatmap := len(src.AttrsJSON) == 0
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forceProviderUpgrade := schemaHasDynamic && stateIsFlatmap
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if src.SchemaVersion == currentVersion && !forceProviderUpgrade {
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// No upgrading required, then.
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return src, nil
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}
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if addr.Resource.Resource.Mode != addrs.ManagedResourceMode {
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// We only do state upgrading for managed resources.
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return src, nil
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}
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providerType := addr.Resource.Resource.DefaultProviderConfig().Type
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if src.SchemaVersion > currentVersion {
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log.Printf("[TRACE] UpgradeResourceState: can't downgrade state for %s from version %d to %d", addr, src.SchemaVersion, currentVersion)
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var diags tfdiags.Diagnostics
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diags = diags.Append(tfdiags.Sourceless(
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tfdiags.Error,
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"Resource instance managed by newer provider version",
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// This is not a very good error message, but we don't retain enough
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// information in state to give good feedback on what provider
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// version might be required here. :(
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fmt.Sprintf("The current state of %s was created by a newer provider version than is currently selected. Upgrade the %s provider to work with this state.", addr, providerType),
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))
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return nil, diags
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}
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// If we get down here then we need to upgrade the state, with the
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// provider's help.
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// If this state was originally created by a version of Terraform prior to
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// v0.12, this also includes translating from legacy flatmap to new-style
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// representation, since only the provider has enough information to
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// understand a flatmap built against an older schema.
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log.Printf("[TRACE] UpgradeResourceState: upgrading state for %s from version %d to %d using provider %q", addr, src.SchemaVersion, currentVersion, providerType)
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req := providers.UpgradeResourceStateRequest{
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TypeName: addr.Resource.Resource.Type,
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// TODO: The internal schema version representations are all using
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// uint64 instead of int64, but unsigned integers aren't friendly
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// to all protobuf target languages so in practice we use int64
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// on the wire. In future we will change all of our internal
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// representations to int64 too.
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Version: int64(src.SchemaVersion),
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}
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if stateIsFlatmap {
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req.RawStateFlatmap = src.AttrsFlat
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} else {
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req.RawStateJSON = src.AttrsJSON
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}
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resp := provider.UpgradeResourceState(req)
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diags := resp.Diagnostics
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if diags.HasErrors() {
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return nil, diags
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}
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// After upgrading, the new value must conform to the current schema. When
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// going over RPC this is actually already ensured by the
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// marshaling/unmarshaling of the new value, but we'll check it here
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// anyway for robustness, e.g. for in-process providers.
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newValue := resp.UpgradedState
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if errs := newValue.Type().TestConformance(currentSchema.ImpliedType()); len(errs) > 0 {
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for _, err := range errs {
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diags = diags.Append(tfdiags.Sourceless(
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tfdiags.Error,
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"Invalid resource state upgrade",
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fmt.Sprintf("The %s provider upgraded the state for %s from a previous version, but produced an invalid result: %s.", providerType, addr, tfdiags.FormatError(err)),
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))
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}
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return nil, diags
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}
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new, err := src.CompleteUpgrade(newValue, currentSchema.ImpliedType(), uint64(currentVersion))
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if err != nil {
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// We already checked for type conformance above, so getting into this
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// codepath should be rare and is probably a bug somewhere under CompleteUpgrade.
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diags = diags.Append(tfdiags.Sourceless(
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tfdiags.Error,
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"Failed to encode result of resource state upgrade",
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fmt.Sprintf("Failed to encode state for %s after resource schema upgrade: %s.", addr, tfdiags.FormatError(err)),
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))
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}
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return new, diags
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}
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