forked from cerc-io/ipld-eth-server
75 lines
2.3 KiB
Go
75 lines
2.3 KiB
Go
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// 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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"fmt"
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"github.com/ethereum/go-ethereum/statediff"
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"github.com/vulcanize/vulcanizedb/pkg/eth/client"
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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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// PayloadFetcher satisfies the PayloadFetcher interface for ethereum
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type PayloadFetcher struct {
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// PayloadFetcher is thread-safe as long as the underlying client is thread-safe, since it has/modifies no other state
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// http.Client is thread-safe
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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 PayloadFetcher
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func NewPayloadFetcher(bc BatchClient) *PayloadFetcher {
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return &PayloadFetcher{
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client: bc,
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}
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}
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// FetchAt 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 (fetcher *PayloadFetcher) FetchAt(blockHeights []uint64) ([]interface{}, 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 := fetcher.client.BatchCall(batch)
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if batchErr != nil {
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return nil, fmt.Errorf("PayloadFetcher err: %s", batchErr.Error())
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}
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results := make([]interface{}, 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, fmt.Errorf("PayloadFetcher err: %s", batchElem.Error.Error())
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}
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payload, ok := batchElem.Result.(*statediff.Payload)
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if ok {
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results = append(results, *payload)
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}
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}
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return results, nil
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}
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