105 lines
3.0 KiB
Go
105 lines
3.0 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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"bytes"
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"time"
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"github.com/btcsuite/btcd/rpcclient"
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"github.com/sirupsen/logrus"
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"github.com/vulcanize/ipfs-chain-watcher/pkg/shared"
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)
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// HTTPPayloadStreamer satisfies the PayloadStreamer interface for bitcoin over http endpoints (since bitcoin core doesn't support websockets)
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type HTTPPayloadStreamer struct {
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Config *rpcclient.ConnConfig
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lastHash []byte
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}
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// NewHTTPPayloadStreamer creates a pointer to a new PayloadStreamer which satisfies the PayloadStreamer interface for bitcoin
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func NewHTTPPayloadStreamer(clientConfig *rpcclient.ConnConfig) *HTTPPayloadStreamer {
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return &HTTPPayloadStreamer{
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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 *HTTPPayloadStreamer) Stream(payloadChan chan shared.RawChainData) (shared.ClientSubscription, error) {
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logrus.Debug("streaming block payloads from btc")
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client, err := rpcclient.New(ps.Config, nil)
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if err != nil {
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return nil, err
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}
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ticker := time.NewTicker(time.Second * 5)
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errChan := make(chan error)
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go func() {
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for {
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// start at
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select {
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case <-ticker.C:
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height, err := client.GetBlockCount()
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if err != nil {
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errChan <- err
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continue
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}
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blockHash, err := client.GetBlockHash(height)
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if err != nil {
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errChan <- err
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continue
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}
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blockHashBytes := blockHash.CloneBytes()
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if bytes.Equal(blockHashBytes, ps.lastHash) {
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continue
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}
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block, err := client.GetBlock(blockHash)
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if err != nil {
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errChan <- err
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continue
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}
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ps.lastHash = blockHashBytes
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payloadChan <- BlockPayload{
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Header: &block.Header,
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BlockHeight: height,
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Txs: msgTxsToUtilTxs(block.Transactions),
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}
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default:
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}
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}
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}()
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return &HTTPClientSubscription{client: client, errChan: errChan}, nil
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}
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// HTTPClientSubscription is a wrapper around the underlying bitcoind rpc client
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// to fit the shared.ClientSubscription interface
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type HTTPClientSubscription struct {
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client *rpcclient.Client
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errChan chan error
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}
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// Unsubscribe satisfies the rpc.Subscription interface
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func (bcs *HTTPClientSubscription) Unsubscribe() {
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bcs.client.Shutdown()
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}
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// Err() satisfies the rpc.Subscription interface
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func (bcs *HTTPClientSubscription) Err() <-chan error {
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return bcs.errChan
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}
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