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package configschema
import (
"github.com/zclconf/go-cty/cty"
)
// Block represents a configuration block.
//
// "Block" here is a logical grouping construct, though it happens to map
// directly onto the physical block syntax of Terraform's native configuration
// syntax. It may be a more a matter of convention in other syntaxes, such as
// JSON.
//
// When converted to a value, a Block always becomes an instance of an object
// type derived from its defined attributes and nested blocks
type Block struct {
// Attributes describes any attributes that may appear directly inside
// the block.
Attributes map[string]*Attribute
// BlockTypes describes any nested block types that may appear directly
// inside the block.
BlockTypes map[string]*NestedBlock
}
// Attribute represents a configuration attribute, within a block.
type Attribute struct {
// Type is a type specification that the attribute's value must conform to.
Type cty.Type
// Description is an English-language description of the purpose and
// usage of the attribute. A description should be concise and use only
// one or two sentences, leaving full definition to longer-form
// documentation defined elsewhere.
Description string
// Required, if set to true, specifies that an omitted or null value is
// not permitted.
Required bool
// Optional, if set to true, specifies that an omitted or null value is
// permitted. This field conflicts with Required.
Optional bool
// Computed, if set to true, specifies that the value comes from the
// provider rather than from configuration. If combined with Optional,
// then the config may optionally provide an overridden value.
Computed bool
// Sensitive, if set to true, indicates that an attribute may contain
// sensitive information.
//
// At present nothing is done with this information, but callers are
// encouraged to set it where appropriate so that it may be used in the
// future to help Terraform mask sensitive information. (Terraform
// currently achieves this in a limited sense via other mechanisms.)
Sensitive bool
}
// NestedBlock represents the embedding of one block within another.
type NestedBlock struct {
// Block is the description of the block that's nested.
Block
// Nesting provides the nesting mode for the child block, which determines
// how many instances of the block are allowed, how many labels it expects,
// and how the resulting data will be converted into a data structure.
Nesting NestingMode
// MinItems and MaxItems set, for the NestingList and NestingSet nesting
// modes, lower and upper limits on the number of child blocks allowed
// of the given type. If both are left at zero, no limit is applied.
//
// As a special case, both values can be set to 1 for NestingSingle in
// order to indicate that a particular single block is required.
//
// These fields are ignored for other nesting modes and must both be left
// at zero.
MinItems, MaxItems int
}
// NestingMode is an enumeration of modes for nesting blocks inside other
// blocks.
type NestingMode int
//go:generate stringer -type=NestingMode
const (
nestingModeInvalid NestingMode = iota
// NestingSingle indicates that only a single instance of a given
// block type is permitted, with no labels, and its content should be
// provided directly as an object value.
NestingSingle
// NestingGroup is similar to NestingSingle in that it calls for only a
// single instance of a given block type with no labels, but it additonally
// guarantees that its result will never be null, even if the block is
// absent, and instead the nested attributes and blocks will be treated
// as absent in that case. (Any required attributes or blocks within the
// nested block are not enforced unless the block is explicitly present
// in the configuration, so they are all effectively optional when the
// block is not present.)
//
// This is useful for the situation where a remote API has a feature that
// is always enabled but has a group of settings related to that feature
// that themselves have default values. By using NestingGroup instead of
// NestingSingle in that case, generated plans will show the block as
// present even when not present in configuration, thus allowing any
// default values within to be displayed to the user.
NestingGroup
// NestingList indicates that multiple blocks of the given type are
// permitted, with no labels, and that their corresponding objects should
// be provided in a list.
NestingList
// NestingSet indicates that multiple blocks of the given type are
// permitted, with no labels, and that their corresponding objects should
// be provided in a set.
NestingSet
// NestingMap indicates that multiple blocks of the given type are
// permitted, each with a single label, and that their corresponding
// objects should be provided in a map whose keys are the labels.
//
// It's an error, therefore, to use the same label value on multiple
// blocks.
NestingMap
)
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