// VulcanizeDB
// Copyright © 2019 Vulcanize

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.

// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package mocks

import (
	"github.com/ethereum/go-ethereum/rpc"
	"github.com/ethereum/go-ethereum/statediff"
)

// StateDiffStreamer is the underlying struct for the Streamer interface
type StateDiffStreamer struct {
	PassedPayloadChan chan statediff.Payload
	ReturnSub         *rpc.ClientSubscription
	ReturnErr         error
	StreamPayloads    []statediff.Payload
}

// Stream is the main loop for subscribing to data from the Geth state diff process
func (sds *StateDiffStreamer) Stream(payloadChan chan statediff.Payload) (*rpc.ClientSubscription, error) {
	sds.PassedPayloadChan = payloadChan

	go func() {
		for _, payload := range sds.StreamPayloads {
			sds.PassedPayloadChan <- payload
		}
	}()

	return sds.ReturnSub, sds.ReturnErr
}