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

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package grpc
import (
"context"
"io"
"time"
"github.com/TrueCloudLab/frostfs-api-go/v2/rpc/common"
"google.golang.org/grpc"
)
// Message represents raw gRPC message.
type Message interface{}
// MessageReadWriter is a component interface
// for transmitting raw messages over gRPC protocol.
type MessageReadWriter interface {
// ReadMessage reads the next message from the remote server,
// and writes it to the argument.
ReadMessage(Message) error
// WriteMessage sends message from argument to remote server.
WriteMessage(Message) error
// Closes the communication session with the remote server.
//
// All calls to send/receive messages must be done before closing.
io.Closer
}
type streamWrapper struct {
grpc.ClientStream
timeout time.Duration
cancel context.CancelFunc
}
func (w streamWrapper) ReadMessage(m Message) error {
return w.withTimeout(func() error {
return w.ClientStream.RecvMsg(m)
})
}
func (w streamWrapper) WriteMessage(m Message) error {
return w.withTimeout(func() error {
return w.ClientStream.SendMsg(m)
})
}
func (w *streamWrapper) Close() error {
return w.withTimeout(w.ClientStream.CloseSend)
}
func (w *streamWrapper) withTimeout(closure func() error) error {
ch := make(chan error, 1)
go func() {
ch <- closure()
close(ch)
}()
tt := time.NewTimer(w.timeout)
select {
case err := <-ch:
tt.Stop()
return err
case <-tt.C:
w.cancel()
return context.DeadlineExceeded
}
}
// Init initiates a messaging session within the RPC configured by options.
func (c *Client) Init(info common.CallMethodInfo, opts ...CallOption) (MessageReadWriter, error) {
prm := defaultCallParameters()
for _, opt := range opts {
opt(prm)
}
ctx, cancel := context.WithCancel(prm.ctx)
stream, err := c.con.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
}