frostfs-api-go/v2/session/client.go

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package session
import (
"context"
"github.com/nspcc-dev/neofs-api-go/v2/client"
session "github.com/nspcc-dev/neofs-api-go/v2/session/grpc"
"github.com/pkg/errors"
"google.golang.org/grpc"
)
// Client represents universal session
// transport client.
type Client struct {
client *createClient
}
// Option represents Client option.
type Option func(*cfg)
type cfg struct {
proto client.Protocol
globalOpts []client.Option
gRPC cfgGRPC
}
type cfgGRPC struct {
serviceClient session.SessionServiceClient
grpcCallOpts []grpc.CallOption
callOpts []session.Option
client *session.Client
}
type createClient struct {
requestConverter func(*CreateRequest) interface{}
caller func(context.Context, interface{}) (interface{}, error)
responseConverter func(interface{}) *CreateResponse
}
// Create sends CreateRequest over the network and returns CreateResponse.
//
// It returns any error encountered during the call.
func (c *Client) Create(ctx context.Context, req *CreateRequest) (*CreateResponse, error) {
resp, err := c.client.caller(ctx, c.client.requestConverter(req))
if err != nil {
return nil, errors.Wrap(err, "could not send session init request")
}
return c.client.responseConverter(resp), nil
}
func defaultCfg() *cfg {
return &cfg{
proto: client.ProtoGRPC,
}
}
func NewClient(opts ...Option) (*Client, error) {
cfg := defaultCfg()
for i := range opts {
opts[i](cfg)
}
var err error
switch cfg.proto {
case client.ProtoGRPC:
var c *session.Client
if c, err = newGRPCClient(cfg); err != nil {
break
}
return &Client{
client: &createClient{
requestConverter: func(req *CreateRequest) interface{} {
return CreateRequestToGRPCMessage(req)
},
caller: func(ctx context.Context, req interface{}) (interface{}, error) {
return c.Create(ctx, req.(*session.CreateRequest))
},
responseConverter: func(resp interface{}) *CreateResponse {
return CreateResponseFromGRPCMessage(resp.(*session.CreateResponse))
},
},
}, nil
default:
err = client.ErrProtoUnsupported
}
return nil, errors.Wrapf(err, "could not create %s Session client", cfg.proto)
}
func newGRPCClient(cfg *cfg) (*session.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 = session.NewSessionServiceClient(conn)
}
cfg.gRPC.client, err = session.NewClient(
cfg.gRPC.serviceClient,
append(
cfg.gRPC.callOpts,
session.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 session.SessionServiceClient) 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 []session.Option) Option {
return func(c *cfg) {
c.gRPC.callOpts = v
}
}
func WithGRPCClient(v *session.Client) Option {
return func(c *cfg) {
c.gRPC.client = v
}
}