micro/client/mucp/mucp_stream.go

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package mucp
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import (
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"context"
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"io"
"sync"
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"github.com/unistack-org/micro/v3/client"
"github.com/unistack-org/micro/v3/codec"
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)
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// Implements the streamer interface
type rpcStream struct {
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sync.RWMutex
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id string
closed chan bool
err error
request client.Request
response client.Response
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codec codec.Codec
context context.Context
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// signal whether we should send EOS
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sendEOS bool
// release releases the connection back to the pool
release func(err error)
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}
func (r *rpcStream) isClosed() bool {
select {
case <-r.closed:
return true
default:
return false
}
}
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func (r *rpcStream) Context() context.Context {
return r.context
}
func (r *rpcStream) Request() client.Request {
return r.request
}
func (r *rpcStream) Response() client.Response {
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return r.response
}
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func (r *rpcStream) Send(msg interface{}) error {
r.Lock()
defer r.Unlock()
if r.isClosed() {
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r.err = errShutdown
return errShutdown
}
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req := codec.Message{
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Id: r.id,
Target: r.request.Service(),
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Method: r.request.Method(),
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Endpoint: r.request.Endpoint(),
Type: codec.Request,
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}
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if err := r.codec.Write(&req, msg); err != nil {
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r.err = err
return err
}
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return nil
}
func (r *rpcStream) Recv(msg interface{}) error {
r.Lock()
defer r.Unlock()
if r.isClosed() {
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r.err = errShutdown
return errShutdown
}
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var resp codec.Message
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r.Unlock()
err := r.codec.ReadHeader(&resp, codec.Response)
r.Lock()
if err != nil {
if err == io.EOF && !r.isClosed() {
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r.err = io.ErrUnexpectedEOF
return io.ErrUnexpectedEOF
}
r.err = err
return err
}
switch {
case len(resp.Error) > 0:
// We've got an error response. Give this to the request;
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// any subsequent requests will get the ReadResponseBody
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// error if there is one.
if resp.Error != lastStreamResponseError {
r.err = serverError(resp.Error)
} else {
r.err = io.EOF
}
r.Unlock()
err = r.codec.ReadBody(nil)
r.Lock()
if err != nil {
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r.err = err
}
default:
r.Unlock()
err = r.codec.ReadBody(msg)
r.Lock()
if err != nil {
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r.err = err
}
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}
return r.err
}
func (r *rpcStream) Error() error {
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r.RLock()
defer r.RUnlock()
return r.err
}
func (r *rpcStream) Close() error {
r.Lock()
select {
case <-r.closed:
r.Unlock()
return nil
default:
close(r.closed)
r.Unlock()
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// send the end of stream message
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if r.sendEOS {
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// no need to check for error
r.codec.Write(&codec.Message{
Id: r.id,
Target: r.request.Service(),
Method: r.request.Method(),
Endpoint: r.request.Endpoint(),
Type: codec.Error,
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Error: lastStreamResponseError,
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}, nil)
}
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err := r.codec.Close()
// release the connection
r.release(r.Error())
// return the codec error
return err
}
}