reflection

Documentation

Index

• Variables
• func GetDiscriminatorByVariant(variant reflect.Type) optional.Option[reflect.Type]
• func GetFSM(name string) optional.Option[ReflectedFSM]
• func GetVariantByName(discriminator reflect.Type, name string) optional.Option[reflect.Type]
• func GetVariantByType(discriminator reflect.Type, variantType reflect.Type) optional.Option[string]
• func IsKnownExternalType(t reflect.Type) bool
• func IsSumTypeDiscriminator(discriminator reflect.Type) bool
• func Module() string
• func ReflectTypeToSchemaType(t reflect.Type) schema.Type
• func Register(options ...Registree)
• func ResetTypeRegistry()
• func TypeFromValue[T any, TP interface{ ... }](v TP) schema.Type
• type Ref
  • func FuncRef(call any) Ref
  • func ParseRef(ref string) (Ref, error)
  • func RefFromProto(p *schemapb.Ref) Ref
  • func TypeRef[T any]() Ref
  • func TypeRefFromValue(v any) Ref
  • func (v Ref) String() string
  • func (v Ref) ToProto() *schemapb.Ref
  • func (v Ref) ToSchema() *schema.Ref
  • func (v *Ref) UnmarshalText(text []byte) error
• type ReflectedFSM
• type Registree
  • func ExternalType(goType any) Registree
  • func FSM(name string, transitions ...Transition) Registree
  • func SumType[Discriminator any](variants ...Discriminator) Registree
• type Transition
• type TypeRegistry

Variables

var AllowAnyPackageForTesting = false

Functions

func GetDiscriminatorByVariant

func GetDiscriminatorByVariant(variant reflect.Type) optional.Option[reflect.Type]

GetDiscriminatorByVariant returns the discriminator type for the given variant type.

func GetFSM

func GetFSM(name string) optional.Option[ReflectedFSM]

GetFSM returns the FSM with the given name, if any.

func GetVariantByName

func GetVariantByName(discriminator reflect.Type, name string) optional.Option[reflect.Type]

GetVariantByName returns the variant type for the given discriminator and variant name.

func GetVariantByType

func GetVariantByType(discriminator reflect.Type, variantType reflect.Type) optional.Option[string]

GetVariantByType returns the variant name for the given discriminator and variant type.

func IsKnownExternalType

func IsKnownExternalType(t reflect.Type) bool

func IsSumTypeDiscriminator

func IsSumTypeDiscriminator(discriminator reflect.Type) bool

IsSumTypeDiscriminator returns true if the given type is a sum type discriminator.

func Module

func Module() string

Module returns the FTL module currently being executed.

func ReflectTypeToSchemaType

func ReflectTypeToSchemaType(t reflect.Type) schema.Type

ReflectTypeToSchemaType returns the FTL schema for a Go reflect.Type.

func Register

func Register(options ...Registree)

Register applies all the provided options to the singleton TypeRegistry

func ResetTypeRegistry

func ResetTypeRegistry()

ResetTypeRegistry clears the contents of the singleton type registry for tests to guarantee determinism.

func TypeFromValue

func TypeFromValue[T any, TP interface{ *T }](v TP) schema.Type

TypeFromValue reflects a schema.Type from a Go value.

The passed value must be a pointer to a value of the desired type. This is to ensure that interface values aren't dereferenced automatically by the Go compiler.

Types

type Ref

type Ref struct {
	Module string `json:"module"`
	Name   string `json:"name"`
}

Ref is an untyped reference to a symbol.

func FuncRef

func FuncRef(call any) Ref

FuncRef returns the Ref for a Go function.

Panics if called with a function outside FTL.

func ParseRef

func ParseRef(ref string) (Ref, error)

func RefFromProto

func RefFromProto(p *schemapb.Ref) Ref

func TypeRef

func TypeRef[T any]() Ref

TypeRef returns the Ref for a Go type.

Panics if called with a type outside of FTL.

func TypeRefFromValue

func TypeRefFromValue(v any) Ref

TypeRefFromValue returns the Ref for a Go value.

The value must be a named type such as a struct, enum, or sum type.

func (Ref) String

func (v Ref) String() string

func (Ref) ToProto

func (v Ref) ToProto() *schemapb.Ref

func (Ref) ToSchema

func (v Ref) ToSchema() *schema.Ref

func (*Ref) UnmarshalText

func (v *Ref) UnmarshalText(text []byte) error

type ReflectedFSM

type ReflectedFSM struct {
	Transitions []Transition
	Schema      *schema.FSM
}

type Registree

type Registree func(t *TypeRegistry)

Registree is a function that registers types with a TypeRegistry.

func ExternalType

func ExternalType(goType any) Registree

ExternalType adds a non-FTL type to the type registry.

func FSM

func FSM(name string, transitions ...Transition) Registree

FSM adds a finite state machine to the type registry.

func SumType

func SumType[Discriminator any](variants ...Discriminator) Registree

SumType adds a sum type and its variants to the type registry.

type Transition

type Transition struct {
	From reflect.Value
	To   reflect.Value
}

Transition represents a transition between two states in an FSM.

type TypeRegistry

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

TypeRegistry is used for dynamic type resolution at runtime. It stores associations between sum type discriminators and their variants, for use in encoding and decoding.

FTL manages the type registry for you, so you don't need to create one yourself.