schema

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 Go to latest Published: Apr 19, 2021 License: MPL-2.0 Imports: 33 Imported by: 0

README

Terraform Helper Lib: schema

The schema package provides a high-level interface for writing resource providers for Terraform.

If you're writing a resource provider, we recommend you use this package.

The interface exposed by this package is much friendlier than trying to write to the Terraform API directly. The core Terraform API is low-level and built for maximum flexibility and control, whereas this library is built as a framework around that to more easily write common providers.

Documentation

Overview

schema is a high-level framework for easily writing new providers for Terraform. Usage of schema is recommended over attempting to write to the low-level plugin interfaces manually.

schema breaks down provider creation into simple CRUD operations for resources. The logic of diffing, destroying before creating, updating or creating, etc. is all handled by the framework. The plugin author only needs to implement a configuration schema and the CRUD operations and everything else is meant to just work.

A good starting point is to view the Provider structure.

Index

Constants

View Source 
const (
	// StringPlain indicates a string is plain-text and requires no processing for display.
	StringPlain = StringKind(configschema.StringPlain)

	// StringMarkdown indicates a string is in markdown format and may
	// require additional processing to display.
	StringMarkdown = StringKind(configschema.StringMarkdown)
)
View Source 
const (
	TimeoutCreate  = "create"
	TimeoutRead    = "read"
	TimeoutUpdate  = "update"
	TimeoutDelete  = "delete"
	TimeoutDefault = "default"
)
View Source 
const TimeoutKey = "e2bfb730-ecaa-11e6-8f88-34363bc7c4c0"
View Source 
const TimeoutsConfigKey = "timeouts"

Variables

View Source 
var (
	// DescriptionKind is the default StringKind of descriptions in this provider.
	// It defaults to StringPlain but can be globally switched to StringMarkdown.
	DescriptionKind = StringPlain

	// SchemaDescriptionBuilder converts helper/schema.Schema Descriptions to configschema.Attribute
	// and Block Descriptions. This method can be used to modify the description text prior to it
	// being returned in the schema.
	SchemaDescriptionBuilder = func(s *Schema) string {
		return s.Description
	}

	// ResourceDescriptionBuilder converts helper/schema.Resource Descriptions to configschema.Block
	// Descriptions at the resource top level. This method can be used to modify the description prior
	// to it being returned in the schema.
	ResourceDescriptionBuilder = func(r *Resource) string {
		return r.Description
	}
)
View Source 
var ReservedDataSourceFields = []string{
	"connection",
	"count",
	"depends_on",
	"lifecycle",
	"provider",
	"provisioner",
}
View Source 
var ReservedProviderFields = []string{
	"alias",
	"version",
}
View Source 
var ReservedResourceFields = []string{
	"connection",
	"count",
	"depends_on",
	"lifecycle",
	"provider",
	"provisioner",
}
View Source 
var (
	StopContextKey = Key("StopContext")
)

Functions

func ApplyDiff 

func ApplyDiff(base cty.Value, d *terraform.InstanceDiff, schema *configschema.Block) (cty.Value, error)

ApplyDiff takes a cty.Value state and applies a terraform.InstanceDiff to get a new cty.Value state. This is used to convert the diff returned from the legacy provider Diff method to the state required for the new PlanResourceChange method.

func DefaultTimeout 

func DefaultTimeout(tx interface{}) *time.Duration

could be time.Duration, int64 or float64

func DiffFromValues 

func DiffFromValues(ctx context.Context, prior, planned cty.Value, res *Resource) (*terraform.InstanceDiff, error)

DiffFromValues takes the current state and desired state as cty.Values and derives a terraform.InstanceDiff to give to the legacy providers. This is used to take the states provided by the new ApplyResourceChange method and convert them to a state+diff required for the legacy Apply method.

func HashInt 

func HashInt(v interface{}) int

HashInt hashes integers. If you want a Set of integers, this is the SchemaSetFunc you want.

func HashString 

func HashString(v interface{}) int

HashString hashes strings. If you want a Set of strings, this is the SchemaSetFunc you want.

func JSONMapToStateValue 

func JSONMapToStateValue(m map[string]interface{}, block *configschema.Block) (cty.Value, error)

JSONMapToStateValue takes a generic json map[string]interface{} and converts it to the specific type, ensuring that the values conform to the schema.

func Noop 

func Noop(*ResourceData, interface{}) error

Noop is a convenience implementation of resource function which takes no action and returns no error.

func NoopContext 

func NoopContext(context.Context, *ResourceData, interface{}) diag.Diagnostics

NoopContext is a convenience implementation of context aware resource function which takes no action and returns no error.

func RemoveFromState 

func RemoveFromState(d *ResourceData, _ interface{}) error

RemoveFromState is a convenience implementation of a resource function which sets the resource ID to empty string (to remove it from state) and returns no error.

func SerializeResourceForHash 

func SerializeResourceForHash(buf *bytes.Buffer, val interface{}, resource *Resource)

SerializeValueForHash appends a serialization of the given resource config to the given buffer, guaranteeing deterministic results given the same value and schema.

Its primary purpose is as input into a hashing function in order to hash complex substructures when used in sets, and so the serialization is not reversible.

func SerializeValueForHash 

func SerializeValueForHash(buf *bytes.Buffer, val interface{}, schema *Schema)

func SetUnknowns 

func SetUnknowns(val cty.Value, schema *configschema.Block) cty.Value

SetUnknowns takes a cty.Value, and compares it to the schema setting any null values which are computed to unknown.

func StateValueFromInstanceState 

func StateValueFromInstanceState(is *terraform.InstanceState, ty cty.Type) (cty.Value, error)

StateValueFromInstanceState converts a terraform.InstanceState to a cty.Value as described by the provided cty.Type, and maintains the resource ID as the "id" attribute.

func StateValueToJSONMap 

func StateValueToJSONMap(val cty.Value, ty cty.Type) (map[string]interface{}, error)

StateValueToJSONMap converts a cty.Value to generic JSON map via the cty JSON encoding.

func StopContext deprecated 

func StopContext(ctx context.Context) (context.Context, bool)

StopContext returns a context safe for global use that will cancel when Terraform requests a stop. This function should only be called within a ConfigureContextFunc, passing in the request scoped context received in that method.

Deprecated: The use of a global context is discouraged. Please use the new context aware CRUD methods.

Types

type BasicMapReader 

type BasicMapReader map[string]string

BasicMapReader implements MapReader for a single map.

func (BasicMapReader) Access 

func (r BasicMapReader) Access(k string) (string, bool)

func (BasicMapReader) Range 

func (r BasicMapReader) Range(f func(string, string) bool) bool

type ConfigFieldReader 

type ConfigFieldReader struct {
	Config *terraform.ResourceConfig
	Schema map[string]*Schema
	// contains filtered or unexported fields
}

ConfigFieldReader reads fields out of an untyped map[string]string to the best of its ability. It also applies defaults from the Schema. (The other field readers do not need default handling because they source fully populated data structures.)

func (*ConfigFieldReader) ReadField 

func (r *ConfigFieldReader) ReadField(address []string) (FieldReadResult, error)

type ConfigureContextFunc 

type ConfigureContextFunc func(context.Context, *ResourceData) (interface{}, diag.Diagnostics)

ConfigureContextFunc is the function used to configure a Provider.

The interface{} value returned by this function is stored and passed into the subsequent resources as the meta parameter. This return value is usually used to pass along a configured API client, a configuration structure, etc.

type ConfigureFunc deprecated 

type ConfigureFunc func(*ResourceData) (interface{}, error)

ConfigureFunc is the function used to configure a Provider.

Deprecated: Please use ConfigureContextFunc

type CreateContextFunc 

type CreateContextFunc func(context.Context, *ResourceData, interface{}) diag.Diagnostics

See Resource documentation.

type CreateFunc deprecated 

type CreateFunc func(*ResourceData, interface{}) error

The following function types are of the legacy CRUD operations.

Deprecated: Please use the context aware equivalents instead.

type CustomizeDiffFunc 

type CustomizeDiffFunc func(context.Context, *ResourceDiff, interface{}) error

See Resource documentation.

type DeleteContextFunc 

type DeleteContextFunc func(context.Context, *ResourceData, interface{}) diag.Diagnostics

See Resource documentation.

type DeleteFunc 

type DeleteFunc func(*ResourceData, interface{}) error

type DiffFieldReader 

type DiffFieldReader struct {
	Diff   *terraform.InstanceDiff
	Source FieldReader
	Schema map[string]*Schema
	// contains filtered or unexported fields
}

DiffFieldReader reads fields out of a diff structures.

It also requires access to a Reader that reads fields from the structure that the diff was derived from. This is usually the state. This is required because a diff on its own doesn't have complete data about full objects such as maps.

The Source MUST be the data that the diff was derived from. If it isn't, the behavior of this struct is undefined.

Reading fields from a DiffFieldReader is identical to reading from Source except the diff will be applied to the end result.

The "Exists" field on the result will be set to true if the complete field exists whether its from the source, diff, or a combination of both. It cannot be determined whether a retrieved value is composed of diff elements.

func (*DiffFieldReader) ReadField 

func (r *DiffFieldReader) ReadField(address []string) (FieldReadResult, error)

type Equal 

type Equal interface {
	Equal(interface{}) bool
}

Equal is an interface that checks for deep equality between two objects.

type ExistsFunc 

type ExistsFunc func(*ResourceData, interface{}) (bool, error)

type FieldReadResult 

type FieldReadResult struct {
	// Value is the actual read value. NegValue is the _negative_ value
	// or the items that should be removed (if they existed). NegValue
	// doesn't make sense for primitives but is important for any
	// container types such as maps, sets, lists.
	Value          interface{}
	ValueProcessed interface{}

	// Exists is true if the field was found in the data. False means
	// it wasn't found if there was no error.
	Exists bool

	// Computed is true if the field was found but the value
	// is computed.
	Computed bool
}

FieldReadResult encapsulates all the resulting data from reading a field.

func (*FieldReadResult) ValueOrZero 

func (r *FieldReadResult) ValueOrZero(s *Schema) interface{}

ValueOrZero returns the value of this result or the zero value of the schema type, ensuring a consistent non-nil return value.

type FieldReader 

type FieldReader interface {
	ReadField([]string) (FieldReadResult, error)
}

FieldReaders are responsible for decoding fields out of data into the proper typed representation. ResourceData uses this to query data out of multiple sources: config, state, diffs, etc.

type FieldWriter 

type FieldWriter interface {
	WriteField([]string, interface{}) error
}

FieldWriters are responsible for writing fields by address into a proper typed representation. ResourceData uses this to write new data into existing sources.

type GRPCProviderServer 

type GRPCProviderServer struct {
	// contains filtered or unexported fields
}

GRPCProviderServer handles the server, or plugin side of the rpc connection.

func NewGRPCProviderServer 

func NewGRPCProviderServer(p *Provider) *GRPCProviderServer

func (*GRPCProviderServer) ApplyResourceChange 

func (s *GRPCProviderServer) ApplyResourceChange(ctx context.Context, req *tfprotov5.ApplyResourceChangeRequest) (*tfprotov5.ApplyResourceChangeResponse, error)

func (*GRPCProviderServer) ConfigureProvider 

func (s *GRPCProviderServer) ConfigureProvider(ctx context.Context, req *tfprotov5.ConfigureProviderRequest) (*tfprotov5.ConfigureProviderResponse, error)

func (*GRPCProviderServer) GetProviderSchema 

func (s *GRPCProviderServer) GetProviderSchema(_ context.Context, req *tfprotov5.GetProviderSchemaRequest) (*tfprotov5.GetProviderSchemaResponse, error)

func (*GRPCProviderServer) ImportResourceState 

func (s *GRPCProviderServer) ImportResourceState(ctx context.Context, req *tfprotov5.ImportResourceStateRequest) (*tfprotov5.ImportResourceStateResponse, error)

func (*GRPCProviderServer) PlanResourceChange 

func (s *GRPCProviderServer) PlanResourceChange(ctx context.Context, req *tfprotov5.PlanResourceChangeRequest) (*tfprotov5.PlanResourceChangeResponse, error)

func (*GRPCProviderServer) PrepareProviderConfig 

func (s *GRPCProviderServer) PrepareProviderConfig(_ context.Context, req *tfprotov5.PrepareProviderConfigRequest) (*tfprotov5.PrepareProviderConfigResponse, error)

func (*GRPCProviderServer) ReadDataSource 

func (s *GRPCProviderServer) ReadDataSource(ctx context.Context, req *tfprotov5.ReadDataSourceRequest) (*tfprotov5.ReadDataSourceResponse, error)

func (*GRPCProviderServer) ReadResource 

func (s *GRPCProviderServer) ReadResource(ctx context.Context, req *tfprotov5.ReadResourceRequest) (*tfprotov5.ReadResourceResponse, error)

func (*GRPCProviderServer) StopContext 

func (s *GRPCProviderServer) StopContext(ctx context.Context) context.Context

StopContext derives a new context from the passed in grpc context. It creates a goroutine to wait for the server stop and propagates cancellation to the derived grpc context.

func (*GRPCProviderServer) StopProvider 

func (s *GRPCProviderServer) StopProvider(_ context.Context, _ *tfprotov5.StopProviderRequest) (*tfprotov5.StopProviderResponse, error)

func (*GRPCProviderServer) UpgradeResourceState 

func (s *GRPCProviderServer) UpgradeResourceState(ctx context.Context, req *tfprotov5.UpgradeResourceStateRequest) (*tfprotov5.UpgradeResourceStateResponse, error)

func (*GRPCProviderServer) ValidateDataSourceConfig 

func (s *GRPCProviderServer) ValidateDataSourceConfig(_ context.Context, req *tfprotov5.ValidateDataSourceConfigRequest) (*tfprotov5.ValidateDataSourceConfigResponse, error)

func (*GRPCProviderServer) ValidateResourceTypeConfig 

func (s *GRPCProviderServer) ValidateResourceTypeConfig(_ context.Context, req *tfprotov5.ValidateResourceTypeConfigRequest) (*tfprotov5.ValidateResourceTypeConfigResponse, error)

type InternalMap 

type InternalMap = schemaMap

InternalMap is used to aid in the transition to the new schema types and protocol. The name is not meant to convey any usefulness, as this is not to be used directly by any providers.

type Key 

type Key string

type MapFieldReader 

type MapFieldReader struct {
	Map    MapReader
	Schema map[string]*Schema
}

MapFieldReader reads fields out of an untyped map[string]string to the best of its ability.

func (*MapFieldReader) ReadField 

func (r *MapFieldReader) ReadField(address []string) (FieldReadResult, error)

type MapFieldWriter 

type MapFieldWriter struct {
	Schema map[string]*Schema
	// contains filtered or unexported fields
}

MapFieldWriter writes data into a single map[string]string structure.

func (*MapFieldWriter) Map 

func (w *MapFieldWriter) Map() map[string]string

Map returns the underlying map that is being written to.

func (*MapFieldWriter) WriteField 

func (w *MapFieldWriter) WriteField(addr []string, value interface{}) error

type MapReader 

type MapReader interface {
	Access(string) (string, bool)
	Range(func(string, string) bool) bool
}

MapReader is an interface that is given to MapFieldReader for accessing a "map". This can be used to have alternate implementations. For a basic map[string]string, use BasicMapReader.

type MultiLevelFieldReader 

type MultiLevelFieldReader struct {
	Readers map[string]FieldReader
	Levels  []string
}

MultiLevelFieldReader reads from other field readers, merging their results along the way in a specific order. You can specify "levels" and name them in order to read only an exact level or up to a specific level.

This is useful for saying things such as "read the field from the state and config and merge them" or "read the latest value of the field".

func (*MultiLevelFieldReader) ReadField 

func (r *MultiLevelFieldReader) ReadField(address []string) (FieldReadResult, error)

func (*MultiLevelFieldReader) ReadFieldExact 

func (r *MultiLevelFieldReader) ReadFieldExact(
	address []string, level string) (FieldReadResult, error)

func (*MultiLevelFieldReader) ReadFieldMerge 

func (r *MultiLevelFieldReader) ReadFieldMerge(
	address []string, level string) (FieldReadResult, error)

type Provider 

type Provider struct {
	// Schema is the schema for the configuration of this provider. If this
	// provider has no configuration, this can be omitted.
	//
	// The keys of this map are the configuration keys, and the value is
	// the schema describing the value of the configuration.
	Schema map[string]*Schema

	// ResourcesMap is the list of available resources that this provider
	// can manage, along with their Resource structure defining their
	// own schemas and CRUD operations.
	//
	// Provider automatically handles routing operations such as Apply,
	// Diff, etc. to the proper resource.
	ResourcesMap map[string]*Resource

	// DataSourcesMap is the collection of available data sources that
	// this provider implements, with a Resource instance defining
	// the schema and Read operation of each.
	//
	// Resource instances for data sources must have a Read function
	// and must *not* implement Create, Update or Delete.
	DataSourcesMap map[string]*Resource

	// ProviderMetaSchema is the schema for the configuration of the meta
	// information for this provider. If this provider has no meta info,
	// this can be omitted. This functionality is currently experimental
	// and subject to change or break without warning; it should only be
	// used by providers that are collaborating on its use with the
	// Terraform team.
	ProviderMetaSchema map[string]*Schema

	// ConfigureFunc is a function for configuring the provider. If the
	// provider doesn't need to be configured, this can be omitted.
	//
	// Deprecated: Please use ConfigureContextFunc instead.
	ConfigureFunc ConfigureFunc

	// ConfigureContextFunc is a function for configuring the provider. If the
	// provider doesn't need to be configured, this can be omitted. This function
	// receives a context.Context that will cancel when Terraform sends a
	// cancellation signal. This function can yield Diagnostics.
	ConfigureContextFunc ConfigureContextFunc

	TerraformVersion string
	// contains filtered or unexported fields
}

Provider represents a resource provider in Terraform, and properly implements all of the ResourceProvider API.

By defining a schema for the configuration of the provider, the map of supporting resources, and a configuration function, the schema framework takes over and handles all the provider operations for you.

After defining the provider structure, it is unlikely that you'll require any of the methods on Provider itself.

func (*Provider) Configure 

func (p *Provider) Configure(ctx context.Context, c *terraform.ResourceConfig) diag.Diagnostics

Configure configures the provider itself with the configuration given. This is useful for setting things like access keys.

This won't be called at all if no provider configuration is given.

func (*Provider) DataSources 

func (p *Provider) DataSources() []terraform.DataSource

DataSources returns all of the available data sources that this provider implements.

func (*Provider) GRPCProvider 

func (p *Provider) GRPCProvider() tfprotov5.ProviderServer

GRPCProvider returns a gRPC server, for use with terraform-plugin-mux.

func (*Provider) GetSchema 

func (p *Provider) GetSchema(req *terraform.ProviderSchemaRequest) (*terraform.ProviderSchema, error)

GetSchema returns the config schema for the main provider configuration, as would appear in a "provider" block in the configuration files.

Currently not all providers support schema. Callers must therefore first call Resources and DataSources and ensure that at least one resource or data source has the SchemaAvailable flag set.

func (*Provider) ImportState 

func (p *Provider) ImportState(
	ctx context.Context,
	info *terraform.InstanceInfo,
	id string) ([]*terraform.InstanceState, error)

ImportState requests that the given resource be imported.

The returned InstanceState only requires ID be set. Importing will always call Refresh after the state to complete it.

IMPORTANT: InstanceState doesn't have the resource type attached to it. A type must be specified on the state via the Ephemeral field on the state.

This function can return multiple states. Normally, an import will map 1:1 to a physical resource. However, some resources map to multiple. For example, an AWS security group may contain many rules. Each rule is represented by a separate resource in Terraform, therefore multiple states are returned.

func (*Provider) InternalValidate 

func (p *Provider) InternalValidate() error

InternalValidate should be called to validate the structure of the provider.

This should be called in a unit test for any provider to verify before release that a provider is properly configured for use with this library.

func (*Provider) Meta 

func (p *Provider) Meta() interface{}

Meta returns the metadata associated with this provider that was returned by the Configure call. It will be nil until Configure is called.

func (*Provider) Resources 

func (p *Provider) Resources() []terraform.ResourceType

Resources returns all the available resource types that this provider knows how to manage.

func (*Provider) SetMeta 

func (p *Provider) SetMeta(v interface{})

SetMeta can be used to forcefully set the Meta object of the provider. Note that if Configure is called the return value will override anything set here.

func (*Provider) UserAgent 

func (p *Provider) UserAgent(name, version string) string

UserAgent returns a string suitable for use in the User-Agent header of requests generated by the provider. The generated string contains the version of Terraform, the Plugin SDK, and the provider used to generate the request. `name` should be the hyphen-separated reporting name of the provider, and `version` should be the version of the provider.

If TF_APPEND_USER_AGENT is set, its value will be appended to the returned string.

func (*Provider) Validate 

func (p *Provider) Validate(c *terraform.ResourceConfig) diag.Diagnostics

Validate is called once at the beginning with the raw configuration (no interpolation done) and can return diagnostics

This is called once with the provider configuration only. It may not be called at all if no provider configuration is given.

This should not assume that any values of the configurations are valid. The primary use case of this call is to check that required keys are set.

func (*Provider) ValidateDataSource 

func (p *Provider) ValidateDataSource(
	t string, c *terraform.ResourceConfig) diag.Diagnostics

ValidateDataSource is called once at the beginning with the raw configuration (no interpolation done) and can return diagnostics.

This is called once per data source instance.

This should not assume any of the values in the resource configuration are valid since it is possible they have to be interpolated still. The primary use case of this call is to check that the required keys are set and that the general structure is correct.

func (*Provider) ValidateResource 

func (p *Provider) ValidateResource(
	t string, c *terraform.ResourceConfig) diag.Diagnostics

ValidateResource is called once at the beginning with the raw configuration (no interpolation done) and can return diagnostics.

This is called once per resource.

This should not assume any of the values in the resource configuration are valid since it is possible they have to be interpolated still. The primary use case of this call is to check that the required keys are set and that the general structure is correct.

type ReadContextFunc 

type ReadContextFunc func(context.Context, *ResourceData, interface{}) diag.Diagnostics

See Resource documentation.

type ReadFunc 

type ReadFunc func(*ResourceData, interface{}) error

type Resource 

type Resource struct {
	// Schema is the schema for the configuration of this resource.
	//
	// The keys of this map are the configuration keys, and the values
	// describe the schema of the configuration value.
	//
	// The schema is used to represent both configurable data as well
	// as data that might be computed in the process of creating this
	// resource.
	Schema map[string]*Schema

	// SchemaVersion is the version number for this resource's Schema
	// definition. The current SchemaVersion stored in the state for each
	// resource. Provider authors can increment this version number
	// when Schema semantics change. If the State's SchemaVersion is less than
	// the current SchemaVersion, the InstanceState is yielded to the
	// MigrateState callback, where the provider can make whatever changes it
	// needs to update the state to be compatible to the latest version of the
	// Schema.
	//
	// When unset, SchemaVersion defaults to 0, so provider authors can start
	// their Versioning at any integer >= 1
	SchemaVersion int

	// MigrateState is responsible for updating an InstanceState with an old
	// version to the format expected by the current version of the Schema.
	//
	// It is called during Refresh if the State's stored SchemaVersion is less
	// than the current SchemaVersion of the Resource.
	//
	// The function is yielded the state's stored SchemaVersion and a pointer to
	// the InstanceState that needs updating, as well as the configured
	// provider's configured meta interface{}, in case the migration process
	// needs to make any remote API calls.
	//
	// Deprecated: MigrateState is deprecated and any new changes to a resource's schema
	// should be handled by StateUpgraders. Existing MigrateState implementations
	// should remain for compatibility with existing state. MigrateState will
	// still be called if the stored SchemaVersion is less than the
	// first version of the StateUpgraders.
	MigrateState StateMigrateFunc

	// StateUpgraders contains the functions responsible for upgrading an
	// existing state with an old schema version to a newer schema. It is
	// called specifically by Terraform when the stored schema version is less
	// than the current SchemaVersion of the Resource.
	//
	// StateUpgraders map specific schema versions to a StateUpgrader
	// function. The registered versions are expected to be ordered,
	// consecutive values. The initial value may be greater than 0 to account
	// for legacy schemas that weren't recorded and can be handled by
	// MigrateState.
	StateUpgraders []StateUpgrader

	// The functions below are the CRUD operations for this resource.
	//
	// Deprecated: Please use the context aware equivalents instead. Only one of
	// the operations or context aware equivalent can be set, not both.
	Create CreateFunc
	Read   ReadFunc
	Update UpdateFunc
	Delete DeleteFunc

	// Exists is a function that is called to check if a resource still
	// exists. If this returns false, then this will affect the diff
	// accordingly. If this function isn't set, it will not be called. You
	// can also signal existence in the Read method by calling d.SetId("")
	// if the Resource is no longer present and should be removed from state.
	// The *ResourceData passed to Exists should _not_ be modified.
	//
	// Deprecated: ReadContext should be able to encapsulate the logic of Exists
	Exists ExistsFunc

	// The functions below are the CRUD operations for this resource.
	//
	// The only optional operation is Update. If Update is not
	// implemented, then updates will not be supported for this resource.
	//
	// The ResourceData parameter in the functions below are used to
	// query configuration and changes for the resource as well as to set
	// the ID, computed data, etc.
	//
	// The interface{} parameter is the result of the ConfigureFunc in
	// the provider for this resource. If the provider does not define
	// a ConfigureFunc, this will be nil. This parameter should be used
	// to store API clients, configuration structures, etc.
	//
	// These functions are passed a context configured to timeout with whatever
	// was set as the timeout for this operation. Useful for forwarding on to
	// backend SDK's that accept context. The context will also cancel if
	// Terraform sends a cancellation signal.
	//
	// These functions return diagnostics, allowing developers to build
	// a list of warnings and errors to be presented to the Terraform user.
	// The AttributePath of those diagnostics should be built within these
	// functions, please consult go-cty documentation for building a cty.Path
	CreateContext CreateContextFunc
	ReadContext   ReadContextFunc
	UpdateContext UpdateContextFunc
	DeleteContext DeleteContextFunc

	// CreateWithoutTimeout is equivalent to CreateContext with no context timeout.
	//
	// Most resources should prefer CreateContext with properly implemented
	// operation timeout values, however there are cases where operation
	// synchronization across concurrent resources is necessary in the resource
	// logic, such as a mutex, to prevent remote system errors. Since these
	// operations would have an indeterminate timeout that scales with the
	// number of resources, this allows resources to control timeout behavior.
	CreateWithoutTimeout CreateContextFunc

	// ReadWithoutTimeout is equivalent to ReadContext with no context timeout.
	//
	// Most resources should prefer ReadContext with properly implemented
	// operation timeout values, however there are cases where operation
	// synchronization across concurrent resources is necessary in the resource
	// logic, such as a mutex, to prevent remote system errors. Since these
	// operations would have an indeterminate timeout that scales with the
	// number of resources, this allows resources to control timeout behavior.
	ReadWithoutTimeout ReadContextFunc

	// UpdateWithoutTimeout is equivalent to UpdateContext with no context timeout.
	//
	// Most resources should prefer UpdateContext with properly implemented
	// operation timeout values, however there are cases where operation
	// synchronization across concurrent resources is necessary in the resource
	// logic, such as a mutex, to prevent remote system errors. Since these
	// operations would have an indeterminate timeout that scales with the
	// number of resources, this allows resources to control timeout behavior.
	UpdateWithoutTimeout UpdateContextFunc

	// DeleteWithoutTimeout is equivalent to DeleteContext with no context timeout.
	//
	// Most resources should prefer DeleteContext with properly implemented
	// operation timeout values, however there are cases where operation
	// synchronization across concurrent resources is necessary in the resource
	// logic, such as a mutex, to prevent remote system errors. Since these
	// operations would have an indeterminate timeout that scales with the
	// number of resources, this allows resources to control timeout behavior.
	DeleteWithoutTimeout DeleteContextFunc

	// CustomizeDiff is a custom function for working with the diff that
	// Terraform has created for this resource - it can be used to customize the
	// diff that has been created, diff values not controlled by configuration,
	// or even veto the diff altogether and abort the plan. It is passed a
	// *ResourceDiff, a structure similar to ResourceData but lacking most write
	// functions like Set, while introducing new functions that work with the
	// diff such as SetNew, SetNewComputed, and ForceNew.
	//
	// The phases Terraform runs this in, and the state available via functions
	// like Get and GetChange, are as follows:
	//
	//  * New resource: One run with no state
	//  * Existing resource: One run with state
	//   * Existing resource, forced new: One run with state (before ForceNew),
	//     then one run without state (as if new resource)
	//  * Tainted resource: No runs (custom diff logic is skipped)
	//  * Destroy: No runs (standard diff logic is skipped on destroy diffs)
	//
	// This function needs to be resilient to support all scenarios.
	//
	// For the most part, only computed fields can be customized by this
	// function.
	//
	// This function is only allowed on regular resources (not data sources).
	CustomizeDiff CustomizeDiffFunc

	// Importer is the ResourceImporter implementation for this resource.
	// If this is nil, then this resource does not support importing. If
	// this is non-nil, then it supports importing and ResourceImporter
	// must be validated. The validity of ResourceImporter is verified
	// by InternalValidate on Resource.
	Importer *ResourceImporter

	// If non-empty, this string is emitted as a warning during Validate.
	DeprecationMessage string

	// Timeouts allow users to specify specific time durations in which an
	// operation should time out, to allow them to extend an action to suit their
	// usage. For example, a user may specify a large Creation timeout for their
	// AWS RDS Instance due to it's size, or restoring from a snapshot.
	// Resource implementors must enable Timeout support by adding the allowed
	// actions (Create, Read, Update, Delete, Default) to the Resource struct, and
	// accessing them in the matching methods.
	Timeouts *ResourceTimeout

	// Description is used as the description for docs, the language server and
	// other user facing usage. It can be plain-text or markdown depending on the
	// global DescriptionKind setting.
	Description string

	// UseJSONNumber should be set when state upgraders will expect
	// json.Numbers instead of float64s for numbers. This is added as a
	// toggle for backwards compatibility for type assertions, but should
	// be used in all new resources to avoid bugs with sufficiently large
	// user input.
	//
	// See github.com/sumitAgrawal007/terraform-plugin-sdk/issues/655 for more
	// details.
	UseJSONNumber bool
}

Resource represents a thing in Terraform that has a set of configurable attributes and a lifecycle (create, read, update, delete).

The Resource schema is an abstraction that allows provider writers to worry only about CRUD operations while off-loading validation, diff generation, etc. to this higher level library.

In spite of the name, this struct is not used only for terraform resources, but also for data sources. In the case of data sources, the Create, Update and Delete functions must not be provided.

func DataSourceResourceShim 

func DataSourceResourceShim(name string, dataSource *Resource) *Resource

DataSourceResourceShim takes a Resource instance describing a data source (with a Read implementation and a Schema, at least) and returns a new Resource instance with additional Create and Delete implementations that allow the data source to be used as a resource.

This is a backward-compatibility layer for data sources that were formerly read-only resources before the data source concept was added. It should not be used for any *new* data sources.

The Read function for the data source *must* call d.SetId with a non-empty id in order for this shim to function as expected.

The provided Resource instance, and its schema, will be modified in-place to make it suitable for use as a full resource.

func (*Resource) Apply 

func (r *Resource) Apply(
	ctx context.Context,
	s *terraform.InstanceState,
	d *terraform.InstanceDiff,
	meta interface{}) (*terraform.InstanceState, diag.Diagnostics)

Apply creates, updates, and/or deletes a resource.

func (*Resource) CoreConfigSchema 

func (r *Resource) CoreConfigSchema() *configschema.Block

CoreConfigSchema is a convenient shortcut for calling CoreConfigSchema on the resource's schema. CoreConfigSchema adds the implicitly required "id" attribute for top level resources if it doesn't exist.

func (*Resource) Data 

func (r *Resource) Data(s *terraform.InstanceState) *ResourceData

Data returns a ResourceData struct for this Resource. Each return value is a separate copy and can be safely modified differently.

The data returned from this function has no actual affect on the Resource itself (including the state given to this function).

This function is useful for unit tests and ResourceImporter functions.

func (*Resource) Diff 

func (r *Resource) Diff(
	ctx context.Context,
	s *terraform.InstanceState,
	c *terraform.ResourceConfig,
	meta interface{}) (*terraform.InstanceDiff, error)

Diff returns a diff of this resource.

func (*Resource) InternalValidate 

func (r *Resource) InternalValidate(topSchemaMap schemaMap, writable bool) error

InternalValidate should be called to validate the structure of the resource.

This should be called in a unit test for any resource to verify before release that a resource is properly configured for use with this library.

Provider.InternalValidate() will automatically call this for all of the resources it manages, so you don't need to call this manually if it is part of a Provider.

func (*Resource) ReadDataApply 

func (r *Resource) ReadDataApply(
	ctx context.Context,
	d *terraform.InstanceDiff,
	meta interface{},
) (*terraform.InstanceState, diag.Diagnostics)

ReadDataApply loads the data for a data source, given a diff that describes the configuration arguments and desired computed attributes.

func (*Resource) RefreshWithoutUpgrade 

func (r *Resource) RefreshWithoutUpgrade(
	ctx context.Context,
	s *terraform.InstanceState,
	meta interface{}) (*terraform.InstanceState, diag.Diagnostics)

RefreshWithoutUpgrade reads the instance state, but does not call MigrateState or the StateUpgraders, since those are now invoked in a separate API call. RefreshWithoutUpgrade is part of the new plugin shims.

func (*Resource) ShimInstanceStateFromValue 

func (r *Resource) ShimInstanceStateFromValue(state cty.Value) (*terraform.InstanceState, error)

ShimInstanceStateFromValue converts a cty.Value to a terraform.InstanceState.

func (*Resource) SimpleDiff 

func (r *Resource) SimpleDiff(
	ctx context.Context,
	s *terraform.InstanceState,
	c *terraform.ResourceConfig,
	meta interface{}) (*terraform.InstanceDiff, error)

func (*Resource) TestResourceData 

func (r *Resource) TestResourceData() *ResourceData

TestResourceData Yields a ResourceData filled with this resource's schema for use in unit testing

TODO: May be able to be removed with the above ResourceData function.

func (*Resource) Validate 

func (r *Resource) Validate(c *terraform.ResourceConfig) diag.Diagnostics

Validate validates the resource configuration against the schema.

type ResourceData 

type ResourceData struct {
	// contains filtered or unexported fields
}

ResourceData is used to query and set the attributes of a resource.

ResourceData is the primary argument received for CRUD operations on a resource as well as configuration of a provider. It is a powerful structure that can be used to not only query data, but also check for changes

The most relevant methods to take a look at are Get and Set.

func ImportStatePassthrough deprecated 

func ImportStatePassthrough(d *ResourceData, m interface{}) ([]*ResourceData, error)

ImportStatePassthrough is an implementation of StateFunc that can be used to simply pass the ID directly through.

Deprecated: Please use the context aware ImportStatePassthroughContext instead

func ImportStatePassthroughContext 

func ImportStatePassthroughContext(ctx context.Context, d *ResourceData, m interface{}) ([]*ResourceData, error)

ImportStatePassthroughContext is an implementation of StateContextFunc that can be used to simply pass the ID directly through. This should be used only in the case that an ID-only refresh is possible.

func TestResourceDataRaw 

func TestResourceDataRaw(t testing.T, schema map[string]*Schema, raw map[string]interface{}) *ResourceData

TestResourceDataRaw creates a ResourceData from a raw configuration map.

func (*ResourceData) ConnInfo 

func (d *ResourceData) ConnInfo() map[string]string

ConnInfo returns the connection info for this resource.

func (*ResourceData) Get 

func (d *ResourceData) Get(key string) interface{}

Get returns the data for the given key, or nil if the key doesn't exist in the schema.

If the key does exist in the schema but doesn't exist in the configuration, then the default value for that type will be returned. For strings, this is "", for numbers it is 0, etc.

If you want to test if something is set at all in the configuration, use GetOk.

func (*ResourceData) GetChange 

func (d *ResourceData) GetChange(key string) (interface{}, interface{})

GetChange returns the old and new value for a given key.

HasChange should be used to check if a change exists. It is possible that both the old and new value are the same if the old value was not set and the new value is. This is common, for example, for boolean fields which have a zero value of false.

func (*ResourceData) GetOk 

func (d *ResourceData) GetOk(key string) (interface{}, bool)

GetOk returns the data for the given key and whether or not the key has been set to a non-zero value at some point.

The first result will not necessarilly be nil if the value doesn't exist. The second result should be checked to determine this information.

func (*ResourceData) GetOkExists deprecated 

func (d *ResourceData) GetOkExists(key string) (interface{}, bool)

GetOkExists can check if TypeBool attributes that are Optional with no Default value have been set.

Deprecated: usage is discouraged due to undefined behaviors and may be removed in a future version of the SDK

func (*ResourceData) GetProviderMeta 

func (d *ResourceData) GetProviderMeta(dst interface{}) error

func (*ResourceData) HasChange 

func (d *ResourceData) HasChange(key string) bool

HasChange returns whether or not the given key has been changed.

func (*ResourceData) HasChangeExcept 

func (d *ResourceData) HasChangeExcept(key string) bool

HasChangeExcept returns whether any keys outside the given key have been changed.

This function only works with root attribute keys.

func (*ResourceData) HasChanges 

func (d *ResourceData) HasChanges(keys ...string) bool

HasChanges returns whether or not any of the given keys has been changed.

func (*ResourceData) HasChangesExcept 

func (d *ResourceData) HasChangesExcept(keys ...string) bool

HasChangesExcept returns whether any keys outside the given keys have been changed.

This function only works with root attribute keys.

func (*ResourceData) Id 

func (d *ResourceData) Id() string

Id returns the ID of the resource.

func (*ResourceData) IsNewResource 

func (d *ResourceData) IsNewResource() bool

func (*ResourceData) MarkNewResource 

func (d *ResourceData) MarkNewResource()

func (*ResourceData) Partial 

func (d *ResourceData) Partial(on bool)

Partial is a legacy function that was used for capturing state of specific attributes if an update only partially worked. Enabling this flag without setting any specific keys with the now removed SetPartial has a useful side effect of preserving all of the resource's previous state. Although confusing, it has been discovered that during an update when an error is returned, the proposed config is set into state, even without any calls to d.Set.

In practice this default behavior goes mostly unnoticed since Terraform refreshes between operations by default. The state situation discussed is subject to further investigation and potential change. Until then, this function has been preserved for the specific usecase.

func (*ResourceData) Set 

func (d *ResourceData) Set(key string, value interface{}) error

Set sets the value for the given key.

If the key is invalid or the value is not a correct type, an error will be returned.

func (*ResourceData) SetConnInfo 

func (d *ResourceData) SetConnInfo(v map[string]string)

SetConnInfo sets the connection info for a resource.

func (*ResourceData) SetId 

func (d *ResourceData) SetId(v string)

SetId sets the ID of the resource. If the value is blank, then the resource is destroyed.

func (*ResourceData) SetType 

func (d *ResourceData) SetType(t string)

SetType sets the ephemeral type for the data. This is only required for importing.

func (*ResourceData) State 

func (d *ResourceData) State() *terraform.InstanceState

State returns the new InstanceState after the diff and any Set calls.

func (*ResourceData) Timeout 

func (d *ResourceData) Timeout(key string) time.Duration

Timeout returns the data for the given timeout key Returns a duration of 20 minutes for any key not found, or not found and no default.

type ResourceDiff 

type ResourceDiff struct {
	// contains filtered or unexported fields
}

ResourceDiff is used to query and make custom changes to an in-flight diff. It can be used to veto particular changes in the diff, customize the diff that has been created, or diff values not controlled by config.

The object functions similar to ResourceData, however most notably lacks Set, SetPartial, and Partial, as it should be used to change diff values only. Most other first-class ResourceData functions exist, namely Get, GetOk, HasChange, and GetChange exist.

All functions in ResourceDiff, save for ForceNew, can only be used on computed fields.

func (*ResourceDiff) Clear 

func (d *ResourceDiff) Clear(key string) error

Clear wipes the diff for a particular key. It is called by ResourceDiff's functionality to remove any possibility of conflicts, but can be called on its own to just remove a specific key from the diff completely.

Note that this does not wipe an override. This function is only allowed on computed keys.

func (*ResourceDiff) ForceNew 

func (d *ResourceDiff) ForceNew(key string) error

ForceNew force-flags ForceNew in the schema for a specific key, and re-calculates its diff, effectively causing this attribute to force a new resource.

Keep in mind that forcing a new resource will force a second run of the resource's CustomizeDiff function (with a new ResourceDiff) once the current one has completed. This second run is performed without state. This behavior will be the same as if a new resource is being created and is performed to ensure that the diff looks like the diff for a new resource as much as possible. CustomizeDiff should expect such a scenario and act correctly.

This function is a no-op/error if there is no diff.

Note that the change to schema is permanent for the lifecycle of this specific ResourceDiff instance.

func (*ResourceDiff) Get 

func (d *ResourceDiff) Get(key string) interface{}

Get hands off to ResourceData.Get.

func (*ResourceDiff) GetChange 

func (d *ResourceDiff) GetChange(key string) (interface{}, interface{})

GetChange gets the change between the state and diff, checking first to see if an overridden diff exists.

This implementation differs from ResourceData's in the way that we first get results from the exact levels for the new diff, then from state and diff as per normal.

func (*ResourceDiff) GetChangedKeysPrefix 

func (d *ResourceDiff) GetChangedKeysPrefix(prefix string) []string

GetChangedKeysPrefix helps to implement Resource.CustomizeDiff where we need to act on all nested fields without calling out each one separately

func (*ResourceDiff) GetOk 

func (d *ResourceDiff) GetOk(key string) (interface{}, bool)

GetOk functions the same way as ResourceData.GetOk, but it also checks the new diff levels to provide data consistent with the current state of the customized diff.

func (*ResourceDiff) GetOkExists 

func (d *ResourceDiff) GetOkExists(key string) (interface{}, bool)

GetOkExists functions the same way as GetOkExists within ResourceData, but it also checks the new diff levels to provide data consistent with the current state of the customized diff.

This is nearly the same function as GetOk, yet it does not check for the zero value of the attribute's type. This allows for attributes without a default, to fully check for a literal assignment, regardless of the zero-value for that type.

func (*ResourceDiff) HasChange 

func (d *ResourceDiff) HasChange(key string) bool

HasChange checks to see if there is a change between state and the diff, or in the overridden diff.

func (*ResourceDiff) Id 

func (d *ResourceDiff) Id() string

Id returns the ID of this resource.

Note that technically, ID does not change during diffs (it either has already changed in the refresh, or will change on update), hence we do not support updating the ID or fetching it from anything else other than state.

func (*ResourceDiff) NewValueKnown 

func (d *ResourceDiff) NewValueKnown(key string) bool

NewValueKnown returns true if the new value for the given key is available as its final value at diff time. If the return value is false, this means either the value is based of interpolation that was unavailable at diff time, or that the value was explicitly marked as computed by SetNewComputed.

func (*ResourceDiff) SetNew 

func (d *ResourceDiff) SetNew(key string, value interface{}) error

SetNew is used to set a new diff value for the mentioned key. The value must be correct for the attribute's schema (mostly relevant for maps, lists, and sets). The original value from the state is used as the old value.

This function is only allowed on computed attributes.

func (*ResourceDiff) SetNewComputed 

func (d *ResourceDiff) SetNewComputed(key string) error

SetNewComputed functions like SetNew, except that it blanks out a new value and marks it as computed.

This function is only allowed on computed attributes.

func (*ResourceDiff) UpdatedKeys 

func (d *ResourceDiff) UpdatedKeys() []string

UpdatedKeys returns the keys that were updated by this ResourceDiff run. These are the only keys that a diff should be re-calculated for.

This is the combined result of both keys for which diff values were updated for or cleared, and also keys that were flagged to be re-diffed as a result of ForceNew.

type ResourceImporter 

type ResourceImporter struct {
	// State is called to convert an ID to one or more InstanceState to
	// insert into the Terraform state.
	//
	// Deprecated: State is deprecated in favor of StateContext.
	// Only one of the two functions can bet set.
	State StateFunc

	// StateContext is called to convert an ID to one or more InstanceState to
	// insert into the Terraform state. If this isn't specified, then
	// the ID is passed straight through. This function receives a context
	// that will cancel if Terraform sends a cancellation signal.
	StateContext StateContextFunc
}

ResourceImporter defines how a resource is imported in Terraform. This can be set onto a Resource struct to make it Importable. Not all resources have to be importable; if a Resource doesn't have a ResourceImporter then it won't be importable.

"Importing" in Terraform is the process of taking an already-created resource and bringing it under Terraform management. This can include updating Terraform state, generating Terraform configuration, etc.

func (*ResourceImporter) InternalValidate 

func (r *ResourceImporter) InternalValidate() error

InternalValidate should be called to validate the structure of this importer. This should be called in a unit test.

Resource.InternalValidate() will automatically call this, so this doesn't need to be called manually. Further, Resource.InternalValidate() is automatically called by Provider.InternalValidate(), so you only need to internal validate the provider.

type ResourceTimeout 

type ResourceTimeout struct {
	Create, Read, Update, Delete, Default *time.Duration
}

func (*ResourceTimeout) ConfigDecode 

func (t *ResourceTimeout) ConfigDecode(s *Resource, c *terraform.ResourceConfig) error

ConfigDecode takes a schema and the configuration (available in Diff) and validates, parses the timeouts into `t`

func (*ResourceTimeout) DiffDecode 

func (t *ResourceTimeout) DiffDecode(is *terraform.InstanceDiff) error

func (*ResourceTimeout) DiffEncode 

func (t *ResourceTimeout) DiffEncode(id *terraform.InstanceDiff) error

DiffEncode, StateEncode, and MetaDecode are analogous to the Go stdlib JSONEncoder interface: they encode/decode a timeouts struct from an instance diff, which is where the timeout data is stored after a diff to pass into Apply.

StateEncode encodes the timeout into the ResourceData's InstanceState for saving to state

func (*ResourceTimeout) StateDecode 

func (t *ResourceTimeout) StateDecode(id *terraform.InstanceState) error

func (*ResourceTimeout) StateEncode 

func (t *ResourceTimeout) StateEncode(is *terraform.InstanceState) error

type Schema 

type Schema struct {
	// Type is the type of the value and must be one of the ValueType values.
	//
	// This type not only determines what type is expected/valid in configuring
	// this value, but also what type is returned when ResourceData.Get is
	// called. The types returned by Get are:
	//
	//   TypeBool - bool
	//   TypeInt - int
	//   TypeFloat - float64
	//   TypeString - string
	//   TypeList - []interface{}
	//   TypeMap - map[string]interface{}
	//   TypeSet - *schema.Set
	//
	Type ValueType

	// ConfigMode allows for overriding the default behaviors for mapping
	// schema entries onto configuration constructs.
	//
	// By default, the Elem field is used to choose whether a particular
	// schema is represented in configuration as an attribute or as a nested
	// block; if Elem is a *schema.Resource then it's a block and it's an
	// attribute otherwise.
	//
	// If Elem is *schema.Resource then setting ConfigMode to
	// SchemaConfigModeAttr will force it to be represented in configuration
	// as an attribute, which means that the Computed flag can be used to
	// provide default elements when the argument isn't set at all, while still
	// allowing the user to force zero elements by explicitly assigning an
	// empty list.
	//
	// When Computed is set without Optional, the attribute is not settable
	// in configuration at all and so SchemaConfigModeAttr is the automatic
	// behavior, and SchemaConfigModeBlock is not permitted.
	ConfigMode SchemaConfigMode

	// If one of these is set, then this item can come from the configuration.
	// Both cannot be set. If Optional is set, the value is optional. If
	// Required is set, the value is required.
	//
	// One of these must be set if the value is not computed. That is:
	// value either comes from the config, is computed, or is both.
	Optional bool
	Required bool

	// If this is non-nil, the provided function will be used during diff
	// of this field. If this is nil, a default diff for the type of the
	// schema will be used.
	//
	// This allows comparison based on something other than primitive, list
	// or map equality - for example SSH public keys may be considered
	// equivalent regardless of trailing whitespace.
	DiffSuppressFunc SchemaDiffSuppressFunc

	// If this is non-nil, then this will be a default value that is used
	// when this item is not set in the configuration.
	//
	// DefaultFunc can be specified to compute a dynamic default.
	// Only one of Default or DefaultFunc can be set. If DefaultFunc is
	// used then its return value should be stable to avoid generating
	// confusing/perpetual diffs.
	//
	// Changing either Default or the return value of DefaultFunc can be
	// a breaking change, especially if the attribute in question has
	// ForceNew set. If a default needs to change to align with changing
	// assumptions in an upstream API then it may be necessary to also use
	// the MigrateState function on the resource to change the state to match,
	// or have the Read function adjust the state value to align with the
	// new default.
	//
	// If Required is true above, then Default cannot be set. DefaultFunc
	// can be set with Required. If the DefaultFunc returns nil, then there
	// will be no default and the user will be asked to fill it in.
	//
	// If either of these is set, then the user won't be asked for input
	// for this key if the default is not nil.
	Default     interface{}
	DefaultFunc SchemaDefaultFunc

	// Description is used as the description for docs, the language server and
	// other user facing usage. It can be plain-text or markdown depending on the
	// global DescriptionKind setting.
	Description string

	// InputDefault is the default value to use for when inputs are requested.
	// This differs from Default in that if Default is set, no input is
	// asked for. If Input is asked, this will be the default value offered.
	InputDefault string

	// The fields below relate to diffs.
	//
	// If Computed is true, then the result of this value is computed
	// (unless specified by config) on creation.
	//
	// If ForceNew is true, then a change in this resource necessitates
	// the creation of a new resource.
	//
	// StateFunc is a function called to change the value of this before
	// storing it in the state (and likewise before comparing for diffs).
	// The use for this is for example with large strings, you may want
	// to simply store the hash of it.
	Computed  bool
	ForceNew  bool
	StateFunc SchemaStateFunc

	// The following fields are only set for a TypeList, TypeSet, or TypeMap.
	//
	// Elem represents the element type. For a TypeMap, it must be a *Schema
	// with a Type that is one of the primitives: TypeString, TypeBool,
	// TypeInt, or TypeFloat. Otherwise it may be either a *Schema or a
	// *Resource. If it is *Schema, the element type is just a simple value.
	// If it is *Resource, the element type is a complex structure,
	// potentially managed via its own CRUD actions on the API.
	Elem interface{}

	// The following fields are only set for a TypeList or TypeSet.
	//
	// MaxItems defines a maximum amount of items that can exist within a
	// TypeSet or TypeList. Specific use cases would be if a TypeSet is being
	// used to wrap a complex structure, however more than one instance would
	// cause instability.
	//
	// MinItems defines a minimum amount of items that can exist within a
	// TypeSet or TypeList. Specific use cases would be if a TypeSet is being
	// used to wrap a complex structure, however less than one instance would
	// cause instability.
	//
	// If the field Optional is set to true then MinItems is ignored and thus
	// effectively zero.
	MaxItems int
	MinItems int

	// The following fields are only valid for a TypeSet type.
	//
	// Set defines a function to determine the unique ID of an item so that
	// a proper set can be built.
	Set SchemaSetFunc

	// ComputedWhen is a set of queries on the configuration. Whenever any
	// of these things is changed, it will require a recompute (this requires
	// that Computed is set to true).
	//
	// NOTE: This currently does not work.
	ComputedWhen []string

	// ConflictsWith is a set of schema keys that conflict with this schema.
	// This will only check that they're set in the _config_. This will not
	// raise an error for a malfunctioning resource that sets a conflicting
	// key.
	//
	// ExactlyOneOf is a set of schema keys that, when set, only one of the
	// keys in that list can be specified. It will error if none are
	// specified as well.
	//
	// AtLeastOneOf is a set of schema keys that, when set, at least one of
	// the keys in that list must be specified.
	//
	// RequiredWith is a set of schema keys that must be set simultaneously.
	ConflictsWith []string
	ExactlyOneOf  []string
	AtLeastOneOf  []string
	RequiredWith  []string

	// When Deprecated is set, this attribute is deprecated.
	//
	// A deprecated field still works, but will probably stop working in near
	// future. This string is the message shown to the user with instructions on
	// how to address the deprecation.
	Deprecated string

	// ValidateFunc allows individual fields to define arbitrary validation
	// logic. It is yielded the provided config value as an interface{} that is
	// guaranteed to be of the proper Schema type, and it can yield warnings or
	// errors based on inspection of that value.
	//
	// ValidateFunc is honored only when the schema's Type is set to TypeInt,
	// TypeFloat, TypeString, TypeBool, or TypeMap. It is ignored for all other types.
	ValidateFunc SchemaValidateFunc

	// ValidateDiagFunc allows individual fields to define arbitrary validation
	// logic. It is yielded the provided config value as an interface{} that is
	// guaranteed to be of the proper Schema type, and it can yield diagnostics
	// based on inspection of that value.
	//
	// ValidateDiagFunc is honored only when the schema's Type is set to TypeInt,
	// TypeFloat, TypeString, TypeBool, or TypeMap. It is ignored for all other types.
	//
	// ValidateDiagFunc is also yielded the cty.Path the SDK has built up to this
	// attribute. The SDK will automatically set the AttributePath of any returned
	// Diagnostics to this path. Therefore the developer does not need to set
	// the AttributePath for primitive types.
	//
	// In the case of TypeMap to provide the most precise information, please
	// set an AttributePath with the additional cty.IndexStep:
	//
	//  AttributePath: cty.IndexStringPath("key_name")
	//
	// Or alternatively use the passed in path to create the absolute path:
	//
	//  AttributePath: append(path, cty.IndexStep{Key: cty.StringVal("key_name")})
	ValidateDiagFunc SchemaValidateDiagFunc

	// Sensitive ensures that the attribute's value does not get displayed in
	// logs or regular output. It should be used for passwords or other
	// secret fields. Future versions of Terraform may encrypt these
	// values.
	Sensitive bool
}

Schema is used to describe the structure of a value.

Read the documentation of the struct elements for important details.

func (*Schema) DefaultValue 

func (s *Schema) DefaultValue() (interface{}, error)

Returns a default value for this schema by either reading Default or evaluating DefaultFunc. If neither of these are defined, returns nil.

func (*Schema) GoString 

func (s *Schema) GoString() string

func (*Schema) ZeroValue 

func (s *Schema) ZeroValue() interface{}

Returns a zero value for the schema.

type SchemaConfigMode 

type SchemaConfigMode int

SchemaConfigMode is used to influence how a schema item is mapped into a corresponding configuration construct, using the ConfigMode field of Schema. 

const (
	SchemaConfigModeAuto SchemaConfigMode = iota
	SchemaConfigModeAttr
	SchemaConfigModeBlock
)

type SchemaDefaultFunc 

type SchemaDefaultFunc func() (interface{}, error)

SchemaDefaultFunc is a function called to return a default value for a field.

func EnvDefaultFunc 

func EnvDefaultFunc(k string, dv interface{}) SchemaDefaultFunc

EnvDefaultFunc is a helper function that returns the value of the given environment variable, if one exists, or the default value otherwise.

func MultiEnvDefaultFunc 

func MultiEnvDefaultFunc(ks []string, dv interface{}) SchemaDefaultFunc

MultiEnvDefaultFunc is a helper function that returns the value of the first environment variable in the given list that returns a non-empty value. If none of the environment variables return a value, the default value is returned.

type SchemaDiffSuppressFunc 

type SchemaDiffSuppressFunc func(k, old, new string, d *ResourceData) bool

SchemaDiffSuppressFunc is a function which can be used to determine whether a detected diff on a schema element is "valid" or not, and suppress it from the plan if necessary.

Return true if the diff should be suppressed, false to retain it.

type SchemaSetFunc 

type SchemaSetFunc func(interface{}) int

SchemaSetFunc is a function that must return a unique ID for the given element. This unique ID is used to store the element in a hash.

func HashResource 

func HashResource(resource *Resource) SchemaSetFunc

HashResource hashes complex structures that are described using a *Resource. This is the default set implementation used when a set's element type is a full resource.

func HashSchema 

func HashSchema(schema *Schema) SchemaSetFunc

HashSchema hashes values that are described using a *Schema. This is the default set implementation used when a set's element type is a single schema.

type SchemaStateFunc 

type SchemaStateFunc func(interface{}) string

SchemaStateFunc is a function used to convert some type to a string to be stored in the state.

type SchemaValidateDiagFunc 

type SchemaValidateDiagFunc func(interface{}, cty.Path) diag.Diagnostics

SchemaValidateDiagFunc is a function used to validate a single field in the schema and has Diagnostic support.

type SchemaValidateFunc deprecated 

type SchemaValidateFunc func(interface{}, string) ([]string, []error)

SchemaValidateFunc is a function used to validate a single field in the schema.

Deprecated: please use SchemaValidateDiagFunc

type Set 

type Set struct {
	F SchemaSetFunc
	// contains filtered or unexported fields
}

Set is a set data structure that is returned for elements of type TypeSet.

func CopySet 

func CopySet(otherSet *Set) *Set

CopySet returns a copy of another set.

func NewSet 

func NewSet(f SchemaSetFunc, items []interface{}) *Set

NewSet is a convenience method for creating a new set with the given items.

func (*Set) Add 

func (s *Set) Add(item interface{})

Add adds an item to the set if it isn't already in the set.

func (*Set) Contains 

func (s *Set) Contains(item interface{}) bool

Contains checks if the set has the given item.

func (*Set) Difference 

func (s *Set) Difference(other *Set) *Set

Difference performs a set difference of the two sets, returning a new third set that has only the elements unique to this set.

func (*Set) Equal 

func (s *Set) Equal(raw interface{}) bool

func (*Set) GoString 

func (s *Set) GoString() string

func (*Set) HashEqual 

func (s *Set) HashEqual(raw interface{}) bool

HashEqual simply checks to the keys the top-level map to the keys in the other set's top-level map to see if they are equal. This obviously assumes you have a properly working hash function - use HashResource if in doubt.

func (*Set) Intersection 

func (s *Set) Intersection(other *Set) *Set

Intersection performs the set intersection of the two sets and returns a new third set.

func (*Set) Len 

func (s *Set) Len() int

Len returns the amount of items in the set.

func (*Set) List 

func (s *Set) List() []interface{}

List returns the elements of this set in slice format.

The order of the returned elements is deterministic. Given the same set, the order of this will always be the same.

func (*Set) Remove 

func (s *Set) Remove(item interface{})

Remove removes an item if it's already in the set. Idempotent.

func (*Set) Union 

func (s *Set) Union(other *Set) *Set

Union performs the set union of the two sets and returns a new third set.

type StateContextFunc 

type StateContextFunc func(context.Context, *ResourceData, interface{}) ([]*ResourceData, error)

StateContextFunc is the function called to import a resource into the Terraform state. It is given a ResourceData with only ID set. This ID is going to be an arbitrary value given by the user and may not map directly to the ID format that the resource expects, so that should be validated.

This should return a slice of ResourceData that turn into the state that was imported. This might be as simple as returning only the argument that was given to the function. In other cases (such as AWS security groups), an import may fan out to multiple resources and this will have to return multiple.

To create the ResourceData structures for other resource types (if you have to), instantiate your resource and call the Data function.

type StateFunc deprecated 

type StateFunc func(*ResourceData, interface{}) ([]*ResourceData, error)

StateFunc is the function called to import a resource into the Terraform state.

Deprecated: Please use the context aware equivalent StateContextFunc.

type StateMigrateFunc 

type StateMigrateFunc func(
	int, *terraform.InstanceState, interface{}) (*terraform.InstanceState, error)

See Resource documentation.

type StateUpgradeFunc 

type StateUpgradeFunc func(ctx context.Context, rawState map[string]interface{}, meta interface{}) (map[string]interface{}, error)

See StateUpgrader

type StateUpgrader 

type StateUpgrader struct {
	// Version is the version schema that this Upgrader will handle, converting
	// it to Version+1.
	Version int

	// Type describes the schema that this function can upgrade. Type is
	// required to decode the schema if the state was stored in a legacy
	// flatmap format.
	Type cty.Type

	// Upgrade takes the JSON encoded state and the provider meta value, and
	// upgrades the state one single schema version. The provided state is
	// deocded into the default json types using a map[string]interface{}. It
	// is up to the StateUpgradeFunc to ensure that the returned value can be
	// encoded using the new schema.
	Upgrade StateUpgradeFunc
}

type StringKind 

type StringKind configschema.StringKind

StringKind represents the format a string is in.

type UpdateContextFunc 

type UpdateContextFunc func(context.Context, *ResourceData, interface{}) diag.Diagnostics

See Resource documentation.

type UpdateFunc 

type UpdateFunc func(*ResourceData, interface{}) error

type ValueType 

type ValueType int

ValueType is an enum of the type that can be represented by a schema. 

const (
	TypeInvalid ValueType = iota
	TypeBool
	TypeInt
	TypeFloat
	TypeString
	TypeList
	TypeMap
	TypeSet

	TypeFunction
)

func (ValueType) String 

func (i ValueType) String() string

func (ValueType) Zero 

func (t ValueType) Zero() interface{}

Zero returns the zero value for a type.

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