65 lines
2.1 KiB
Go
65 lines
2.1 KiB
Go
// VulcanizeDB
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// Copyright © 2019 Vulcanize
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package eth
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import (
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"context"
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"github.com/ethereum/go-ethereum/rpc"
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"github.com/ethereum/go-ethereum/statediff"
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"github.com/sirupsen/logrus"
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"github.com/vulcanize/vulcanizedb/pkg/super_node/shared"
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)
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const (
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PayloadChanBufferSize = 20000 // the max eth sub buffer size
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)
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// StreamClient is an interface for subscribing and streaming from geth
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type StreamClient interface {
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Subscribe(ctx context.Context, namespace string, payloadChan interface{}, args ...interface{}) (*rpc.ClientSubscription, error)
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}
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// PayloadStreamer satisfies the PayloadStreamer interface for ethereum
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type PayloadStreamer struct {
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Client StreamClient
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}
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// NewPayloadStreamer creates a pointer to a new PayloadStreamer which satisfies the PayloadStreamer interface for ethereum
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func NewPayloadStreamer(client StreamClient) *PayloadStreamer {
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return &PayloadStreamer{
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Client: client,
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}
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}
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// Stream is the main loop for subscribing to data from the Geth state diff process
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// Satisfies the shared.PayloadStreamer interface
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func (ps *PayloadStreamer) Stream(payloadChan chan shared.RawChainData) (shared.ClientSubscription, error) {
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stateDiffChan := make(chan statediff.Payload, PayloadChanBufferSize)
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logrus.Debug("streaming diffs from geth")
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go func() {
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for {
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select {
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case payload := <-stateDiffChan:
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payloadChan <- payload
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}
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}
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}()
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return ps.Client.Subscribe(context.Background(), "statediff", stateDiffChan, "stream")
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}
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