github.com/graywolf-at-work-2/terraform-vendor@v1.4.5/internal/legacy/helper/schema/shims.go (about)

     1  package schema
     2  
     3  import (
     4  	"encoding/json"
     5  
     6  	"github.com/zclconf/go-cty/cty"
     7  	ctyjson "github.com/zclconf/go-cty/cty/json"
     8  
     9  	"github.com/hashicorp/terraform/internal/configs/configschema"
    10  	"github.com/hashicorp/terraform/internal/configs/hcl2shim"
    11  	"github.com/hashicorp/terraform/internal/legacy/terraform"
    12  )
    13  
    14  // DiffFromValues takes the current state and desired state as cty.Values and
    15  // derives a terraform.InstanceDiff to give to the legacy providers. This is
    16  // used to take the states provided by the new ApplyResourceChange method and
    17  // convert them to a state+diff required for the legacy Apply method.
    18  func DiffFromValues(prior, planned cty.Value, res *Resource) (*terraform.InstanceDiff, error) {
    19  	return diffFromValues(prior, planned, res, nil)
    20  }
    21  
    22  // diffFromValues takes an additional CustomizeDiffFunc, so we can generate our
    23  // test fixtures from the legacy tests. In the new provider protocol the diff
    24  // only needs to be created for the apply operation, and any customizations
    25  // have already been done.
    26  func diffFromValues(prior, planned cty.Value, res *Resource, cust CustomizeDiffFunc) (*terraform.InstanceDiff, error) {
    27  	instanceState, err := res.ShimInstanceStateFromValue(prior)
    28  	if err != nil {
    29  		return nil, err
    30  	}
    31  
    32  	configSchema := res.CoreConfigSchema()
    33  
    34  	cfg := terraform.NewResourceConfigShimmed(planned, configSchema)
    35  	removeConfigUnknowns(cfg.Config)
    36  	removeConfigUnknowns(cfg.Raw)
    37  
    38  	diff, err := schemaMap(res.Schema).Diff(instanceState, cfg, cust, nil, false)
    39  	if err != nil {
    40  		return nil, err
    41  	}
    42  
    43  	return diff, err
    44  }
    45  
    46  // During apply the only unknown values are those which are to be computed by
    47  // the resource itself. These may have been marked as unknown config values, and
    48  // need to be removed to prevent the UnknownVariableValue from appearing the diff.
    49  func removeConfigUnknowns(cfg map[string]interface{}) {
    50  	for k, v := range cfg {
    51  		switch v := v.(type) {
    52  		case string:
    53  			if v == hcl2shim.UnknownVariableValue {
    54  				delete(cfg, k)
    55  			}
    56  		case []interface{}:
    57  			for _, i := range v {
    58  				if m, ok := i.(map[string]interface{}); ok {
    59  					removeConfigUnknowns(m)
    60  				}
    61  			}
    62  		case map[string]interface{}:
    63  			removeConfigUnknowns(v)
    64  		}
    65  	}
    66  }
    67  
    68  // ApplyDiff takes a cty.Value state and applies a terraform.InstanceDiff to
    69  // get a new cty.Value state. This is used to convert the diff returned from
    70  // the legacy provider Diff method to the state required for the new
    71  // PlanResourceChange method.
    72  func ApplyDiff(base cty.Value, d *terraform.InstanceDiff, schema *configschema.Block) (cty.Value, error) {
    73  	return d.ApplyToValue(base, schema)
    74  }
    75  
    76  // StateValueToJSONMap converts a cty.Value to generic JSON map via the cty JSON
    77  // encoding.
    78  func StateValueToJSONMap(val cty.Value, ty cty.Type) (map[string]interface{}, error) {
    79  	js, err := ctyjson.Marshal(val, ty)
    80  	if err != nil {
    81  		return nil, err
    82  	}
    83  
    84  	var m map[string]interface{}
    85  	if err := json.Unmarshal(js, &m); err != nil {
    86  		return nil, err
    87  	}
    88  
    89  	return m, nil
    90  }
    91  
    92  // JSONMapToStateValue takes a generic json map[string]interface{} and converts it
    93  // to the specific type, ensuring that the values conform to the schema.
    94  func JSONMapToStateValue(m map[string]interface{}, block *configschema.Block) (cty.Value, error) {
    95  	var val cty.Value
    96  
    97  	js, err := json.Marshal(m)
    98  	if err != nil {
    99  		return val, err
   100  	}
   101  
   102  	val, err = ctyjson.Unmarshal(js, block.ImpliedType())
   103  	if err != nil {
   104  		return val, err
   105  	}
   106  
   107  	return block.CoerceValue(val)
   108  }
   109  
   110  // StateValueFromInstanceState converts a terraform.InstanceState to a
   111  // cty.Value as described by the provided cty.Type, and maintains the resource
   112  // ID as the "id" attribute.
   113  func StateValueFromInstanceState(is *terraform.InstanceState, ty cty.Type) (cty.Value, error) {
   114  	return is.AttrsAsObjectValue(ty)
   115  }