[#452] morph/client: Add reputation contract client

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/morph/client/reputation/client.go

@@ -0,0 +1,128 @@
+package reputation
+
+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 reputation 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 reputation contract client
+
+	*cfg // contract method names
+}
+
+// Option is a client configuration change function.
+type Option func(*cfg)
+
+type cfg struct {
+	putMethod,
+	getMethod,
+	getByIDMethod,
+	listByEpochMethod string
+}
+
+const (
+	defaultPutMethod         = "put"
+	defaultGetMethod         = "get"
+	defaultGetByIDMethod     = "getByID"
+	defaultListByEpochMethod = "listByEpoch"
+)
+
+func defaultConfig() *cfg {
+	return &cfg{
+		putMethod:         defaultPutMethod,
+		getMethod:         defaultGetMethod,
+		getByIDMethod:     defaultGetByIDMethod,
+		listByEpochMethod: defaultListByEpochMethod,
+	}
+}
+
+// New creates, initializes and returns the Client instance.
+//
+// If StaticClient is nil, client.ErrNilStaticClient is returned.
+//
+// Other values are set according to provided options, or by default.
+//
+// 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, error) {
+	if c == nil {
+		return nil, client.ErrNilStaticClient
+	}
+
+	res := &Client{
+		client: c,
+		cfg:    defaultConfig(), // build default configuration
+	}
+
+	// apply options
+	for _, opt := range opts {
+		opt(res.cfg)
+	}
+
+	return res, nil
+}
+
+// WithPutMethod returns a client constructor option that
+// specifies the method name to put reputation value.
+//
+// Ignores empty value.
+//
+// If option not provided, "put" is used.
+func WithPutMethod(n string) Option {
+	return func(c *cfg) {
+		if n != "" {
+			c.putMethod = n
+		}
+	}
+}
+
+// WithGetMethod returns a client constructor option that
+// specifies the method name to get reputation value.
+//
+// Ignores empty value.
+//
+// If option not provided, "get" is used.
+func WithGetMethod(n string) Option {
+	return func(c *cfg) {
+		if n != "" {
+			c.getMethod = n
+		}
+	}
+}
+
+// WithGetByIDMethod returns a client constructor option that
+// specifies the method name to get reputation value by it's ID in the contract.
+//
+// Ignores empty value.
+//
+// If option not provided, "getByID" is used.
+func WithGetByIDMethod(n string) Option {
+	return func(c *cfg) {
+		if n != "" {
+			c.getByIDMethod = n
+		}
+	}
+}
+
+// WithListByEpochMethod returns a client constructor option that
+// specifies the method name to list reputation value IDs for certain epoch.
+//
+// Ignores empty value.
+//
+// If option not provided, "listByEpoch" is used.
+func WithListByEpochDMethod(n string) Option {
+	return func(c *cfg) {
+		if n != "" {
+			c.listByEpochMethod = n
+		}
+	}
+}