89 lines
1.7 KiB
Go
89 lines
1.7 KiB
Go
package grpc
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import (
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"context"
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"io"
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"sync"
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"github.com/micro/go-micro/v3/client"
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"google.golang.org/grpc"
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)
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// Implements the streamer interface
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type grpcStream struct {
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sync.RWMutex
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closed bool
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err error
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conn *grpc.ClientConn
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stream grpc.ClientStream
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request client.Request
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response client.Response
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context context.Context
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cancel func()
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}
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func (g *grpcStream) Context() context.Context {
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return g.context
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}
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func (g *grpcStream) Request() client.Request {
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return g.request
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}
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func (g *grpcStream) Response() client.Response {
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return g.response
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}
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func (g *grpcStream) Send(msg interface{}) error {
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if err := g.stream.SendMsg(msg); err != nil {
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g.setError(err)
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return err
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}
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return nil
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}
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func (g *grpcStream) Recv(msg interface{}) (err error) {
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defer g.setError(err)
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if err = g.stream.RecvMsg(msg); err != nil {
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// #202 - inconsistent gRPC stream behavior
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// the only way to tell if the stream is done is when we get a EOF on the Recv
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// here we should close the underlying gRPC ClientConn
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closeErr := g.Close()
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if err == io.EOF && closeErr != nil {
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err = closeErr
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}
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}
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return
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}
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func (g *grpcStream) Error() error {
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g.RLock()
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defer g.RUnlock()
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return g.err
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}
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func (g *grpcStream) setError(e error) {
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g.Lock()
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g.err = e
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g.Unlock()
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}
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// Close the gRPC send stream
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// #202 - inconsistent gRPC stream behavior
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// The underlying gRPC stream should not be closed here since the
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// stream should still be able to receive after this function call
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// TODO: should the conn be closed in another way?
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func (g *grpcStream) Close() error {
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g.Lock()
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defer g.Unlock()
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if g.closed {
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return nil
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}
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// cancel the context
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g.cancel()
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g.closed = true
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g.stream.CloseSend()
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return g.conn.Close()
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}
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