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