87 lines
2.8 KiB
Go
87 lines
2.8 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 btc
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import (
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"github.com/btcsuite/btcd/rpcclient"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil"
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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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// PayloadStreamer satisfies the PayloadStreamer interface for bitcoin
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type PayloadStreamer struct {
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Config *rpcclient.ConnConfig
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}
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// NewPayloadStreamer creates a pointer to a new PayloadStreamer which satisfies the PayloadStreamer interface for bitcoin
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func NewPayloadStreamer(clientConfig *rpcclient.ConnConfig) *PayloadStreamer {
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return &PayloadStreamer{
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Config: clientConfig,
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}
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}
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// Stream is the main loop for subscribing to data from the btc block notifications
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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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logrus.Info("streaming block payloads from btc")
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blockNotificationHandler := rpcclient.NotificationHandlers{
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// Notification handler for block connections, forwards new block data to the payloadChan
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OnFilteredBlockConnected: func(height int32, header *wire.BlockHeader, txs []*btcutil.Tx) {
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payloadChan <- BlockPayload{
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Height: height,
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Header: header,
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Txs: txs,
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}
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},
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}
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// Create a new client, and connect to btc ws server
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client, err := rpcclient.New(ps.Config, &blockNotificationHandler)
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if err != nil {
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return nil, err
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}
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// Register for block connect notifications.
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if err := client.NotifyBlocks(); err != nil {
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return nil, err
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}
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client.WaitForShutdown()
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return &ClientSubscription{client: client}, nil
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}
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// ClientSubscription is a wrapper around the underlying btcd rpc client
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// to fit the shared.ClientSubscription interface
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type ClientSubscription struct {
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client *rpcclient.Client
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}
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// Unsubscribe satisfies the rpc.Subscription interface
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func (bcs *ClientSubscription) Unsubscribe() {
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bcs.client.Shutdown()
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}
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// Err() satisfies the rpc.Subscription interface with a dummy err channel
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func (bcs *ClientSubscription) Err() <-chan error {
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errChan := make(chan error)
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return errChan
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}
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