70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
package client
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import (
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"context"
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"io"
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"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/common"
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"git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/rpc/message"
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"google.golang.org/grpc"
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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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if err := c.openGRPCConn(prm.ctx); err != nil {
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return nil, err
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}
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ctx, cancel := context.WithCancel(prm.ctx)
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stream, err := c.conn.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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