frostfs-api-go/rpc/client/init.go

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package client
import (
"io"
"github.com/TrueCloudLab/frostfs-api-go/v2/rpc/common"
"github.com/TrueCloudLab/frostfs-api-go/v2/rpc/grpc"
"github.com/TrueCloudLab/frostfs-api-go/v2/rpc/message"
)
// MessageReader is an interface of the Message reader.
type MessageReader interface {
// ReadMessage reads the next Message.
//
// Returns io.EOF if there are no more messages to read.
// ReadMessage should not be called after io.EOF occasion.
ReadMessage(message.Message) error
}
// MessageWriter is an interface of the Message writer.
type MessageWriter interface {
// WriteMessage writers the next Message.
//
// WriteMessage should not be called after any error.
WriteMessage(message.Message) error
}
// MessageReadWriter is a component interface
// for transmitting raw Protobuf messages.
type MessageReadWriter interface {
MessageReader
MessageWriter
// Closes the communication session.
//
// All calls to send/receive messages must be done before closing.
io.Closer
}
// Init initiates a messaging session and returns the interface for message transmitting.
func (c *Client) Init(info common.CallMethodInfo, opts ...CallOption) (MessageReadWriter, error) {
prm := defaultCallParameters()
for _, opt := range opts {
opt(prm)
}
return c.initGRPC(info, prm)
}
type rwGRPC struct {
grpc.MessageReadWriter
}
func (g rwGRPC) ReadMessage(m message.Message) error {
// Can be optimized: we can create blank message here.
gm := m.ToGRPCMessage()
if err := g.MessageReadWriter.ReadMessage(gm); err != nil {
return err
}
return m.FromGRPCMessage(gm)
}
func (g rwGRPC) WriteMessage(m message.Message) error {
return g.MessageReadWriter.WriteMessage(m.ToGRPCMessage())
}
func (c *Client) initGRPC(info common.CallMethodInfo, prm *callParameters) (MessageReadWriter, error) {
if err := c.createGRPCClient(prm.ctx); err != nil {
return nil, err
}
rw, err := c.gRPCClient.Init(info, grpc.WithContext(prm.ctx))
if err != nil {
return nil, err
}
return &rwGRPC{
MessageReadWriter: rw,
}, nil
}