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

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package client
import (
"context"
"io"
"github.com/TrueCloudLab/frostfs-api-go/v2/rpc/common"
"github.com/TrueCloudLab/frostfs-api-go/v2/rpc/message"
"google.golang.org/grpc"
)
// 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)
}
if err := c.openGRPCConn(prm.ctx); err != nil {
return nil, err
}
ctx, cancel := context.WithCancel(prm.ctx)
stream, err := c.conn.NewStream(ctx, &grpc.StreamDesc{
StreamName: info.Name,
ServerStreams: info.ServerStream(),
ClientStreams: info.ClientStream(),
}, toMethodName(info))
if err != nil {
cancel()
return nil, err
}
return &streamWrapper{
ClientStream: stream,
cancel: cancel,
timeout: c.rwTimeout,
}, nil
}