73 lines
2.3 KiB
Go
73 lines
2.3 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 fetcher
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import (
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"github.com/ethereum/go-ethereum/statediff"
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"github.com/vulcanize/vulcanizedb/pkg/geth/client"
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)
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// IStateDiffFetcher is the state diff fetching interface
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type IStateDiffFetcher interface {
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FetchStateDiffsAt(blockHeights []uint64) ([]*statediff.Payload, error)
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}
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// BatchClient is an interface to a batch-fetching geth rpc client; created to allow mock insertion
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type BatchClient interface {
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BatchCall(batch []client.BatchElem) error
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}
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// StateDiffFetcher is the state diff fetching struct
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type StateDiffFetcher struct {
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client BatchClient
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}
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const method = "statediff_stateDiffAt"
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// NewStateDiffFetcher returns a IStateDiffFetcher
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func NewStateDiffFetcher(bc BatchClient) IStateDiffFetcher {
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return &StateDiffFetcher{
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client: bc,
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}
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}
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// FetchStateDiffsAt fetches the statediff payloads at the given block heights
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// Calls StateDiffAt(ctx context.Context, blockNumber uint64) (*Payload, error)
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func (sdf *StateDiffFetcher) FetchStateDiffsAt(blockHeights []uint64) ([]*statediff.Payload, error) {
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batch := make([]client.BatchElem, 0)
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for _, height := range blockHeights {
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batch = append(batch, client.BatchElem{
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Method: method,
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Args: []interface{}{height},
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Result: new(statediff.Payload),
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})
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}
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batchErr := sdf.client.BatchCall(batch)
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if batchErr != nil {
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return nil, batchErr
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}
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results := make([]*statediff.Payload, 0, len(blockHeights))
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for _, batchElem := range batch {
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if batchElem.Error != nil {
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return nil, batchElem.Error
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}
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results = append(results, batchElem.Result.(*statediff.Payload))
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}
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return results, nil
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}
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