frostfs-api-go-pogpp/v2/accounting/client.go
Leonard Lyubich 5206d14c16 v2/accounting: Add universal client
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
2020-09-18 10:43:39 +03:00

156 lines
3.3 KiB
Go

package accounting
import (
"context"
accounting "github.com/nspcc-dev/neofs-api-go/v2/accounting/grpc"
"github.com/nspcc-dev/neofs-api-go/v2/client"
"github.com/pkg/errors"
"google.golang.org/grpc"
)
// Client represents universal accounting
// transport client.
type Client struct {
client *getBalanceClient
}
// Option represents Client option.
type Option func(*cfg)
type cfg struct {
proto client.Protocol
globalOpts []client.Option
gRPC cfgGRPC
}
type cfgGRPC struct {
serviceClient accounting.AccountingServiceClient
grpcCallOpts []grpc.CallOption
callOpts []accounting.Option
client *accounting.Client
}
type getBalanceClient struct {
requestConverter func(*BalanceRequest) interface{}
caller func(context.Context, interface{}) (interface{}, error)
responseConverter func(interface{}) *BalanceResponse
}
// Balance sends BalanceRequest over the network and returns BalanceResponse.
//
// It returns any error encountered during the call.
func (c *Client) Balance(ctx context.Context, req *BalanceRequest) (*BalanceResponse, error) {
resp, err := c.client.caller(ctx, c.client.requestConverter(req))
if err != nil {
return nil, errors.Wrap(err, "could not send balance request")
}
return c.client.responseConverter(resp), nil
}
func defaultCfg() *cfg {
return &cfg{
proto: client.ProtoGRPC,
}
}
func New(opts ...Option) (*Client, error) {
cfg := defaultCfg()
for i := range opts {
opts[i](cfg)
}
var err error
switch cfg.proto {
case client.ProtoGRPC:
var c *accounting.Client
if c, err = newGRPCClient(cfg); err != nil {
break
}
return &Client{
client: &getBalanceClient{
requestConverter: func(req *BalanceRequest) interface{} {
return BalanceRequestToGRPCMessage(req)
},
caller: func(ctx context.Context, req interface{}) (interface{}, error) {
return c.Balance(ctx, req.(*accounting.BalanceRequest))
},
responseConverter: func(resp interface{}) *BalanceResponse {
return BalanceResponseFromGRPCMessage(resp.(*accounting.BalanceResponse))
},
},
}, nil
default:
err = client.ErrProtoUnsupported
}
return nil, errors.Wrapf(err, "could not create %s Accounting client", cfg.proto)
}
func newGRPCClient(cfg *cfg) (*accounting.Client, error) {
var err error
if cfg.gRPC.client == nil {
if cfg.gRPC.serviceClient == nil {
conn, err := client.NewGRPCClientConn(cfg.globalOpts...)
if err != nil {
return nil, errors.Wrap(err, "could not open gRPC client connection")
}
cfg.gRPC.serviceClient = accounting.NewAccountingServiceClient(conn)
}
cfg.gRPC.client, err = accounting.NewClient(
cfg.gRPC.serviceClient,
append(
cfg.gRPC.callOpts,
accounting.WithCallOptions(cfg.gRPC.grpcCallOpts),
)...,
)
}
return cfg.gRPC.client, err
}
func WithGlobalOpts(v ...client.Option) Option {
return func(c *cfg) {
if len(v) > 0 {
c.globalOpts = v
}
}
}
func WithGRPCServiceClient(v accounting.AccountingServiceClient) Option {
return func(c *cfg) {
c.gRPC.serviceClient = v
}
}
func WithGRPCCallOpts(v []grpc.CallOption) Option {
return func(c *cfg) {
c.gRPC.grpcCallOpts = v
}
}
func WithGRPCClientOpts(v []accounting.Option) Option {
return func(c *cfg) {
c.gRPC.callOpts = v
}
}
func WithGRPCClient(v *accounting.Client) Option {
return func(c *cfg) {
c.gRPC.client = v
}
}