88 lines
2.6 KiB
Go
88 lines
2.6 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 logs
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import (
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"errors"
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"github.com/sirupsen/logrus"
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"github.com/vulcanize/vulcanizedb/libraries/shared/chunker"
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"github.com/vulcanize/vulcanizedb/libraries/shared/transformer"
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"github.com/vulcanize/vulcanizedb/pkg/core"
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"github.com/vulcanize/vulcanizedb/pkg/datastore"
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)
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var ErrNoTransformers = errors.New("no event transformers configured in the log delegator")
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const (
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logsFound = true
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noLogsFound = false
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)
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type ILogDelegator interface {
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AddTransformer(t transformer.EventTransformer)
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DelegateLogs() (error, bool)
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}
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type LogDelegator struct {
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Chunker chunker.Chunker
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LogRepository datastore.HeaderSyncLogRepository
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Transformers []transformer.EventTransformer
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}
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func (delegator *LogDelegator) AddTransformer(t transformer.EventTransformer) {
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delegator.Transformers = append(delegator.Transformers, t)
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delegator.Chunker.AddConfig(t.GetConfig())
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}
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func (delegator *LogDelegator) DelegateLogs() (error, bool) {
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if len(delegator.Transformers) < 1 {
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return ErrNoTransformers, noLogsFound
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}
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persistedLogs, fetchErr := delegator.LogRepository.GetUntransformedHeaderSyncLogs()
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if fetchErr != nil {
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logrus.Errorf("error loading logs from db: %s", fetchErr.Error())
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return fetchErr, noLogsFound
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}
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if len(persistedLogs) < 1 {
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return nil, noLogsFound
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}
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transformErr := delegator.delegateLogs(persistedLogs)
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if transformErr != nil {
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logrus.Errorf("error transforming logs: %s", transformErr)
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return transformErr, logsFound
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}
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return nil, logsFound
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}
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func (delegator *LogDelegator) delegateLogs(logs []core.HeaderSyncLog) error {
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chunkedLogs := delegator.Chunker.ChunkLogs(logs)
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for _, t := range delegator.Transformers {
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transformerName := t.GetConfig().TransformerName
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logChunk := chunkedLogs[transformerName]
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err := t.Execute(logChunk)
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if err != nil {
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logrus.Errorf("%v transformer failed to execute in watcher: %v", transformerName, err)
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return err
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}
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}
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return nil
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}
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