forked from cerc-io/ipld-eth-server
85 lines
3.1 KiB
Go
85 lines
3.1 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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// Streamer is used by watchers to stream eth data from a vulcanizedb seed node
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package streamer
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import (
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"encoding/json"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/rpc"
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"github.com/vulcanize/vulcanizedb/pkg/config"
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"github.com/vulcanize/vulcanizedb/pkg/core"
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)
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// ISeedNodeStreamer is the interface for streaming data from a vulcanizeDB seed node
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type ISeedNodeStreamer interface {
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Stream(payloadChan chan SeedNodePayload, streamFilters config.Subscription) (*rpc.ClientSubscription, error)
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}
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// SeedNodeStreamer is the underlying struct for the ISeedNodeStreamer interface
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type SeedNodeStreamer struct {
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Client core.RpcClient
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}
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// NewSeedNodeStreamer creates a pointer to a new SeedNodeStreamer which satisfies the ISeedNodeStreamer interface
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func NewSeedNodeStreamer(client core.RpcClient) *SeedNodeStreamer {
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return &SeedNodeStreamer{
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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 a vulcanizedb seed node
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func (sds *SeedNodeStreamer) Stream(payloadChan chan SeedNodePayload, streamFilters config.Subscription) (*rpc.ClientSubscription, error) {
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return sds.Client.Subscribe("vulcanizedb", payloadChan, "stream", streamFilters)
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}
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// Payload holds the data returned from the seed node to the requesting client
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type SeedNodePayload struct {
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BlockNumber *big.Int `json:"blockNumber"`
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HeadersRlp [][]byte `json:"headersRlp"`
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UnclesRlp [][]byte `json:"unclesRlp"`
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TransactionsRlp [][]byte `json:"transactionsRlp"`
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ReceiptsRlp [][]byte `json:"receiptsRlp"`
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StateNodesRlp map[common.Hash][]byte `json:"stateNodesRlp"`
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StorageNodesRlp map[common.Hash]map[common.Hash][]byte `json:"storageNodesRlp"`
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ErrMsg string `json:"errMsg"`
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encoded []byte
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err error
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}
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func (sd *SeedNodePayload) ensureEncoded() {
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if sd.encoded == nil && sd.err == nil {
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sd.encoded, sd.err = json.Marshal(sd)
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}
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}
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// Length to implement Encoder interface for StateDiff
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func (sd *SeedNodePayload) Length() int {
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sd.ensureEncoded()
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return len(sd.encoded)
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}
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// Encode to implement Encoder interface for StateDiff
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func (sd *SeedNodePayload) Encode() ([]byte, error) {
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sd.ensureEncoded()
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return sd.encoded, sd.err
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}
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