bjartek/underflow

Underflow is a library to help parse cadence datatypes into sane golang defaults

Underflow

A library extracted out from https://github.com/bjartek/overflow that has less depdendencies and only parses to from go<>cadence

How to convert a cadence.Value to terser json or a go interface{} value

if you want a map[string]interface use underflow.CadenceValueToInterface

underflow.CadenceValueToJsonString(<your cadence value>)

This will create a very terse representation

• it will skip any value that is empty/bottom type
• if a value is empty a key is skipped

If you do not like this you can configure it like this

underflow.CadenceValueToJsonStringWithOption(<your cadence value>, underflow.Options{
	IncludeEmptyValues:   true, //this will not skip empty values/keys
	WrapWithComplexTypes: true, //this will wrap any complex types with another layer that includes the type
})

How to create a cadence value from a struct

pub contract MyFancyContract {

	pub struct MyStruct{
		pub let owner: Address
		pub let name: String

}

Create the following go struct

type MyFancyContract_MyStruct struct {
	Owner string `cadence:"owner,cadenceAddress"`
	Name string `cadence:"name"`
}


myImpl := MyFancyContract_MyStruct{
  Owner: "0x123",
  Name: "bjartek is the best"
}


//resolver is here a function that takes in the name of a go struct and returns the identifier of the cadence type on a given network
// resolver func(name string) (string, error) 

err, myCadenceValue :=underflow.InputToCadence(myImp, resolver)