func (c *Codec) ReadHeader(hdr *rpc.Header) error {
var m json.RawMessage
var version int
err := c.conn.Receive(&m)
if err == nil {
logger.Tracef("<- %s", m)
c.msg, version, err = c.readMessage(m)
} else {
logger.Tracef("<- error: %v (closing %v)", err, c.isClosing())
}
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 errors.Annotate(err, "error receiving message")
}
hdr.RequestId = c.msg.RequestId
hdr.Request = rpc.Request{
Type: c.msg.Type,
Version: c.msg.Version,
Id: c.msg.Id,
Action: c.msg.Request,
}
hdr.Error = c.msg.Error
hdr.ErrorCode = c.msg.ErrorCode
hdr.Version = version
return nil
}
