How to decode a config using structs leveraging protobuf oneof?

[0xBigBoss]

Anyone have any luck decoding oneof protobuf structs using Viper and mapstructure?

Have a struct generated from a protobuf like this.

// KeybaseConfig is the configuration for the Keybase. It is modular and can be configured to use either the File Keybase or the Hashicorp Vault Keybase.
message KeybaseConfig {
	oneof config {
		KeybaseFileConfig file = 1;
		KeybaseVaultConfig vault = 2;
	}
}


// KeybaseFileConfig is the configuration for the File Keybase
message KeybaseFileConfig {
	// Path to the keybase file
	string path = 1;
}

// KeybaseVaultConfig is the configuration for the Hashicorp Vault Keybase
message KeybaseVaultConfig {
		// Vault address
		string addr = 1;
		// Vault token
		string token = 2;
		// Vault mount path
		string mount_path = 3;
}

Then, have a top-level Config struct that includes the generated go files.

type Config struct {
	// ... other stuff
	Keybase     *KeybaseConfig     `json:"keybase"`
}

Using a config file looks like this so far.

Keybase with a vault

{
	"keybase": {
		"config": {
			"vault": {
				"addr": "http://localhost:8200",
				"token": "test_token",
				"mountPath": "secrets"
			}
		}
	}
}

Keybase using local file

{
		"keybase": {
			"config": {
				"file": {
					"path": "/tmp/keybase"
				}
			}
		}
}

Full code example https://github.com/pokt-network/pocket/compare/0xbigboss/fix-626-modularize-keybase-config