frostfs-node/pkg/morph/client/neofsid/client.go
Leonard Lyubich 68b469a79d [#505] neofsid: Implement contract client
Implement NeoFS ID contact's client which is responsible for collecting call
arguments and parsing stack items. Initially only key listing method is
supported.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2021-05-19 13:55:10 +03:00

78 lines
1.8 KiB
Go

package neofsid
import (
"github.com/nspcc-dev/neofs-node/pkg/morph/client"
)
// Client is a wrapper over StaticClient
// which makes calls with the names and arguments
// of the NeoFS ID contract.
//
// Working client must be created via constructor New.
// Using the Client that has been created with new(Client)
// expression (or just declaring a Client variable) is unsafe
// and can lead to panic.
type Client struct {
client *client.StaticClient // static NeoFS ID contract client
*cfg // contract method names
}
// Option is a client configuration change function.
type Option func(*cfg)
type cfg struct {
keyListingMethod string
}
const (
defaultKeyListingMethod = "key" // default key listing method name
)
func defaultConfig() *cfg {
return &cfg{
keyListingMethod: defaultKeyListingMethod,
}
}
// New creates, initializes and returns the Client instance.
//
// If StaticClient is nil, panic occurs.
//
// Other values are set according to provided options, or by default:
// * key listing method name: key.
//
// If desired option satisfies the default value, it can be omitted.
// If multiple options of the same config value are supplied,
// the option with the highest index in the arguments will be used.
func New(c *client.StaticClient, opts ...Option) *Client {
if c == nil {
panic("static client is nil")
}
res := &Client{
client: c,
cfg: defaultConfig(), // build default configuration
}
// apply options
for _, opt := range opts {
opt(res.cfg)
}
return res
}
// WithKeyListingMethod returns a client constructor option that
// specifies the method name of key listing operation.
//
// Ignores empty value.
//
// If option not provided, "key" is used.
func WithKeyListingMethod(n string) Option {
return func(c *cfg) {
if n != "" {
c.keyListingMethod = n
}
}
}