Number types

Number types store an arbitrary precision (generally more than 64-bit, up to 512-bit) number.

By default, number from schema (configuration, plan, and state) data are represented in the framework by types.NumberType and its associated value storage type of types.Number. These types fully support Terraform's type system concepts that cannot be represented in Go built-in types, such as *big.Float. Framework types can be extended by provider code or shared libraries to provide specific use case functionality.

Schema Definitions

Number values can be added to all framework schemas and nested attribute types. Each concept (provider, resource, data source, etc.) has a separate NumberAttribute, for example (non-exhaustive):

If the number value should be the element type of a collection attribute type, set the ElemType field to types.NumberType or the appropriate custom type.

If the number value should be a value type of an object attribute type, set the AttrTypes map value to types.NumberType or the appropriate custom type.

Accessing Values

Access types.Number information via the following methods:

• (types.Number).IsNull() bool: Returns true if the number is null.
• (types.Number).IsUnknown() bool: Returns true if the number is unknown.
• (types.Number).ValueBigFloat() *big.Float: Returns the known number, or the equivalent of 0.0 if null or unknown.

In this example, a number value is checked for being null or unknown value first, before accessing its known value:

// Example data model definition
// type ExampleModel struct {
//   ExampleAttribute types.Number `tfsdk:"example_attribute"`
// }
//
// This would be filled in, such as calling: req.Plan.Get(ctx, &data)
var data ExampleModel

// optional logic for handling null value
if data.ExampleAttribute.IsNull() {
    // ...
}

// optional logic for handling unknown value
if data.ExampleAttribute.IsUnknown() {
    // ...
}

// myNumber now contains a Go *big.Float with the known value
myNumber := data.ExampleAttribute.ValueBigFloat()

Setting Values

Call one of the following to create a types.Number value:

• types.NumberNull(): A null float64 value.
• types.NumberUnknown(): An unknown float64 value.
• types.NumberValue(*big.Float): A known value.

In this example, a known number value is created:

types.NumberValue(big.NewFloat(1.23))

Otherwise, for certain framework functionality that does not require types implementations directly, such as:

• (tfsdk.State).SetAttribute()
• types.ListValueFrom()
• types.MapValueFrom()
• types.ObjectValueFrom()
• types.SetValueFrom()

Numbers can be automatically converted from the following Go types, pointers to these types, or any aliases of these types, such type MyNumber int:

• int, int8, int16, int32, int64
• uint, uint8, uint16, uint32, uint64
• float32, float64
• *big.Int, *big.Float

In this example, a *big.Float is directly used to set a number attribute value:

diags := resp.State.SetAttribute(ctx, path.Root("example_attribute"), big.NewFloat(1.23))

In this example, a types.List of types.Number is created from a []*big.Float:

listValue, diags := types.ListValueFrom(ctx, types.NumberType, []*big.Float{big.NewFloat(1.2), big.NewFloat(2.4)})

Extending

The framework supports extending its base type implementations with custom types. These can adjust expected provider code usage depending on their implementation.