frostfs-node/pkg/morph/client/balance/wrapper/wrapper.go

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package wrapper
import (
"fmt"
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"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"
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"github.com/nspcc-dev/neofs-node/pkg/morph/client/balance"
)
// 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 *balance.Client
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}
// Option allows to set an optional
// parameter of Wrapper.
type Option func(*opts)
type opts []client.StaticClientOption
func defaultOpts() *opts {
return new(opts)
}
// TryNotary returns option to enable
// notary invocation tries.
func TryNotary() Option {
return func(o *opts) {
*o = append(*o, client.TryNotary())
}
}
// AsAlphabet returns option to sign main TX
// of notary requests with client's private
// key.
//
// Considered to be used by IR nodes only.
func AsAlphabet() Option {
return func(o *opts) {
*o = append(*o, client.AsAlphabet())
}
}
// NewFromMorph returns the wrapper instance from the raw morph client.
func NewFromMorph(cli *client.Client, contract util.Uint160, fee fixedn.Fixed8, opts ...Option) (*Wrapper, error) {
o := defaultOpts()
for i := range opts {
opts[i](o)
}
staticClient, err := client.NewStatic(cli, contract, fee, ([]client.StaticClientOption)(*o)...)
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
}