frostfs-node/pkg/morph/client/balance/wrapper/wrapper.go
Evgenii Stratonikov 2b2b2c2c45 [#496] Use single contract wrapper constructor
There is no need in a separate `New()` or `WrapClient()`

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
2021-05-25 13:41:39 +03:00

49 lines
1.6 KiB
Go

package wrapper
import (
"errors"
"fmt"
"github.com/nspcc-dev/neo-go/pkg/encoding/fixedn"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neofs-node/pkg/morph/client"
"github.com/nspcc-dev/neofs-node/pkg/morph/client/balance"
)
// Client represents the Balance contract client.
//
// It is a type alias of
// github.com/nspcc-dev/neofs-node/pkg/morph/client/balance.Client.
type Client = balance.Client
// Wrapper is a wrapper over balance contract
// client which implements:
// * tool for obtaining the amount of funds in the client's account;
// * tool for obtaining decimal precision of currency transactions.
//
// Working wrapper must be created via constructor New.
// Using the Wrapper that has been created with new(Wrapper)
// expression (or just declaring a Wrapper variable) is unsafe
// and can lead to panic.
type Wrapper struct {
client *Client
}
// ErrNilWrapper is returned by functions that expect
// a non-nil Wrapper pointer, but received nil.
var ErrNilWrapper = errors.New("balance contract client wrapper is nil")
// NewFromMorph returns the wrapper instance from the raw morph client.
func NewFromMorph(cli *client.Client, contract util.Uint160, fee fixedn.Fixed8) (*Wrapper, error) {
staticClient, err := client.NewStatic(cli, contract, fee)
if err != nil {
return nil, fmt.Errorf("could not create static client of Balance contract: %w", err)
}
enhancedBalanceClient, err := balance.New(staticClient)
if err != nil {
return nil, fmt.Errorf("could not create Balance contract client: %w", err)
}
return &Wrapper{client: enhancedBalanceClient}, nil
}