forked from TrueCloudLab/frostfs-api-go
cf765a61a6
Implement gRPC client that can uniformly execute any RPC on the remote server. In the primary implementation, the client is a thin wrapper over gRPC client connection that is required to create the client. In the future, it is planned to expand the library with convenient functionality. Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
65 lines
1.5 KiB
Go
65 lines
1.5 KiB
Go
package grpc
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import (
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"io"
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"github.com/nspcc-dev/neofs-api-go/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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}
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func (w streamWrapper) ReadMessage(m Message) error {
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return w.ClientStream.RecvMsg(m)
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}
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func (w streamWrapper) WriteMessage(m Message) error {
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return w.ClientStream.SendMsg(m)
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}
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func (w *streamWrapper) Close() error {
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return w.ClientStream.CloseSend()
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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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stream, err := c.con.NewStream(prm.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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return nil, err
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}
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return &streamWrapper{
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ClientStream: stream,
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}, nil
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}
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