84 lines
2.0 KiB
Go
84 lines
2.0 KiB
Go
package client
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import (
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"io"
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"github.com/nspcc-dev/neofs-api-go/v2/rpc/common"
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"github.com/nspcc-dev/neofs-api-go/v2/rpc/grpc"
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"github.com/nspcc-dev/neofs-api-go/v2/rpc/message"
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)
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// MessageReader is an interface of the Message reader.
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type MessageReader interface {
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// ReadMessage reads the next Message.
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//
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// Returns io.EOF if there are no more messages to read.
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// ReadMessage should not be called after io.EOF occasion.
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ReadMessage(message.Message) error
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}
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// MessageWriter is an interface of the Message writer.
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type MessageWriter interface {
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// WriteMessage writers the next Message.
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//
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// WriteMessage should not be called after any error.
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WriteMessage(message.Message) error
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}
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// MessageReadWriter is a component interface
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// for transmitting raw Protobuf messages.
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type MessageReadWriter interface {
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MessageReader
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MessageWriter
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// Closes the communication session.
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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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// Init initiates a messaging session and returns the interface for message transmitting.
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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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return c.initGRPC(info, prm)
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}
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type rwGRPC struct {
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grpc.MessageReadWriter
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}
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func (g rwGRPC) ReadMessage(m message.Message) error {
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// Can be optimized: we can create blank message here.
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gm := m.ToGRPCMessage()
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if err := g.MessageReadWriter.ReadMessage(gm); err != nil {
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return err
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}
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return m.FromGRPCMessage(gm)
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}
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func (g rwGRPC) WriteMessage(m message.Message) error {
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return g.MessageReadWriter.WriteMessage(m.ToGRPCMessage())
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}
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func (c *Client) initGRPC(info common.CallMethodInfo, prm *callParameters) (MessageReadWriter, error) {
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if err := c.createGRPCClient(); err != nil {
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return nil, err
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}
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rw, err := c.gRPCClient.Init(info, prm.callOpts...)
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if err != nil {
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return nil, err
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}
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return &rwGRPC{
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MessageReadWriter: rw,
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}, nil
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}
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