ipld-eth-server/pkg/transformers/price_feeds/transformer.go
Rob Mulholand 634604d0b5 Combine price feed transformers
- fetches logs from all three price feeds in one query
- assumes eth/usd price feed will be updated to include LogValue event
- updates transformers to run separate from header sync
2018-08-16 11:22:16 -05:00

66 lines
2.0 KiB
Go

// Copyright © 2018 Vulcanize
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package price_feeds
import (
"github.com/vulcanize/vulcanizedb/pkg/core"
"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
)
type PriceFeedTransformerInitializer struct {
Config IPriceFeedConfig
}
func (initializer PriceFeedTransformerInitializer) NewPriceFeedTransformer(db *postgres.DB, blockChain core.BlockChain) shared.Transformer {
converter := PriceFeedConverter{}
fetcher := NewPriceFeedFetcher(blockChain, initializer.Config.ContractAddresses)
repository := NewPriceFeedRepository(db)
return PriceFeedTransformer{
Config: initializer.Config,
converter: converter,
Fetcher: fetcher,
Repository: repository,
}
}
type PriceFeedTransformer struct {
Config IPriceFeedConfig
converter PriceFeedConverter
Fetcher IPriceFeedFetcher
Repository IPriceFeedRepository
}
func (transformer PriceFeedTransformer) Execute() error {
headers, err := transformer.Repository.MissingHeaders(transformer.Config.StartingBlockNumber, transformer.Config.EndingBlockNumber)
if err != nil {
return err
}
for _, header := range headers {
logs, err := transformer.Fetcher.FetchLogValues(header.BlockNumber)
if err != nil {
return err
}
for _, log := range logs {
model := transformer.converter.ToModel(log, header.Id)
err = transformer.Repository.Create(model)
if err != nil {
return err
}
}
}
return nil
}