micro/server/mucp/rpc_stream.go

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package mucp
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import (
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"context"
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"errors"
"io"
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"sync"
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"github.com/unistack-org/micro/v3/codec"
"github.com/unistack-org/micro/v3/server"
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)
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// Implements the Streamer interface
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type rpcStream struct {
sync.RWMutex
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id string
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closed bool
err error
request server.Request
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codec codec.Codec
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context context.Context
}
func (r *rpcStream) Context() context.Context {
return r.context
}
func (r *rpcStream) Request() server.Request {
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return r.request
}
func (r *rpcStream) Send(msg interface{}) error {
r.Lock()
defer r.Unlock()
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resp := codec.Message{
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Target: r.request.Service(),
Method: r.request.Method(),
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Endpoint: r.request.Endpoint(),
Id: r.id,
Type: codec.Response,
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}
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if err := r.codec.Write(&resp, msg); err != nil {
r.err = err
}
return nil
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}
func (r *rpcStream) Recv(msg interface{}) error {
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req := new(codec.Message)
req.Type = codec.Request
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err := r.codec.ReadHeader(req, req.Type)
r.Lock()
defer r.Unlock()
if err != nil {
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// discard body
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r.codec.ReadBody(nil)
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r.err = err
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return err
}
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// check the error
if len(req.Error) > 0 {
// Check the client closed the stream
switch req.Error {
case lastStreamResponseError.Error():
// discard body
r.Unlock()
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r.codec.ReadBody(nil)
r.Lock()
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r.err = io.EOF
return io.EOF
default:
return errors.New(req.Error)
}
}
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// we need to stay up to date with sequence numbers
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r.id = req.Id
r.Unlock()
err = r.codec.ReadBody(msg)
r.Lock()
if err != nil {
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r.err = err
return err
}
return nil
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}
func (r *rpcStream) Error() error {
r.RLock()
defer r.RUnlock()
return r.err
}
func (r *rpcStream) Close() error {
r.Lock()
defer r.Unlock()
r.closed = true
return r.codec.Close()
}