func (c *Codec) ReadHeader(hdr *rpc.Header) error {
c.msg = inMsg{} // avoid any potential cross-message contamination.
var err error
if c.isLogging() {
var m json.RawMessage
err = c.conn.Receive(&m)
if err == nil {
logger.Tracef("<- %s", m)
err = json.Unmarshal(m, &c.msg)
} else {
logger.Tracef("<- error: %v (closing %v)", err, c.isClosing())
}
} else {
err = c.conn.Receive(&c.msg)
}
if err != nil {
// If we've closed the connection, we may get a spurious error,
// so ignore it.
if c.isClosing() || err == io.EOF {
return io.EOF
}
return fmt.Errorf("error receiving message: %v", err)
}
hdr.RequestId = c.msg.RequestId
hdr.Request = rpc.Request{
Type: c.msg.Type,
Id: c.msg.Id,
Action: c.msg.Request,
}
hdr.Error = c.msg.Error
hdr.ErrorCode = c.msg.ErrorCode
return nil
}
func (c *testCodec) WriteMessage(hdr *rpc.Header, x interface{}) error {
if reflect.ValueOf(x).Kind() != reflect.Struct {
panic(fmt.Errorf("WriteRequest bad param; want struct got %T (%#v)", x, x))
}
if c.role != roleBoth && hdr.IsRequest() != (c.role == roleClient) {
panic(fmt.Errorf("codec role %v; header wrong type %#v", c.role, hdr))
}
logger.Infof("send header: %#v; body: %#v", hdr, x)
return c.Codec.WriteMessage(hdr, x)
}
func (c *testCodec) ReadHeader(hdr *rpc.Header) error {
err := c.Codec.ReadHeader(hdr)
if err != nil {
return err
}
logger.Infof("got header %#v", hdr)
if c.role != roleBoth && hdr.IsRequest() == (c.role == roleClient) {
panic(fmt.Errorf("codec role %v; read wrong type %#v", c.role, hdr))
}
return nil
}
// init fills out the receiving outMsg with information from the given
// header and body.
func (m *outMsg) init(hdr *rpc.Header, body interface{}) {
m.RequestId = hdr.RequestId
m.Type = hdr.Request.Type
m.Id = hdr.Request.Id
m.Request = hdr.Request.Action
m.Error = hdr.Error
m.ErrorCode = hdr.ErrorCode
if hdr.IsRequest() {
m.Params = body
} else {
m.Response = body
}
}
func (*suite) TestRead(c *gc.C) {
for i, test := range readTests {
c.Logf("test %d", i)
codec := jsoncodec.New(&testConn{
readMsgs: []string{test.msg},
})
var hdr rpc.Header
err := codec.ReadHeader(&hdr)
c.Assert(err, gc.IsNil)
c.Assert(hdr, gc.DeepEquals, test.expectHdr)
c.Assert(hdr.IsRequest(), gc.Equals, test.expectHdr.IsRequest())
body := reflect.New(reflect.ValueOf(test.expectBody).Type().Elem()).Interface()
err = codec.ReadBody(body, test.expectHdr.IsRequest())
c.Assert(err, gc.IsNil)
c.Assert(body, gc.DeepEquals, test.expectBody)
err = codec.ReadHeader(&hdr)
c.Assert(err, gc.Equals, io.EOF)
}
}
