// PutResponse writes a response and an error associated with it to the
// cache for the specified cmdID.
func (rc *ResponseCache) PutResponse(e engine.Engine, cmdID proto.ClientCmdID, replyWithErr proto.ResponseWithError) error {
// Do nothing if command ID is empty.
if cmdID.IsEmpty() {
return nil
}
// Write the response value to the engine.
if rc.shouldCacheResponse(replyWithErr) {
// Write the error into the reply before caching.
header := replyWithErr.Reply.Header()
header.SetGoError(replyWithErr.Err)
// Be sure to clear it when you're done!
defer func() { header.Error = nil }()
key := keys.ResponseCacheKey(rc.raftID, &cmdID)
var rwResp proto.ReadWriteCmdResponse
if !rwResp.SetValue(replyWithErr.Reply) {
panic(fmt.Sprintf("response %T not supported by response cache", replyWithErr.Reply))
}
return engine.MVCCPutProto(e, nil, key, proto.ZeroTimestamp, nil, &rwResp)
}
return nil
}
