77 lines
2.2 KiB
Go
77 lines
2.2 KiB
Go
package shared
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import (
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"github.com/ethereum/go-ethereum/common"
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"github.com/vulcanize/vulcanizedb/pkg/core"
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"github.com/vulcanize/vulcanizedb/pkg/datastore/postgres"
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"github.com/vulcanize/vulcanizedb/pkg/transformers"
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"github.com/vulcanize/vulcanizedb/pkg/transformers/shared"
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)
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type Watcher struct {
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Transformers []shared.Transformer
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DB postgres.DB
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Blockchain core.BlockChain
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Fetcher shared.LogFetcher
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Chunker shared.LogChunker
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Addresses []common.Address
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Topics []common.Hash
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}
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func NewWatcher(db postgres.DB, bc core.BlockChain) Watcher {
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transformerConfigs := transformers.TransformerConfigs()
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var contractAddresses []common.Address
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var topic0s []common.Hash
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for _, config := range transformerConfigs {
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for _, address := range config.ContractAddresses {
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contractAddresses = append(contractAddresses, common.HexToAddress(address))
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}
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topic0s = append(topic0s, common.HexToHash(config.Topic))
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}
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chunker := shared.NewLogChunker(transformerConfigs)
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fetcher := shared.NewFetcher(bc)
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return Watcher{
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DB: db,
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Blockchain: bc,
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Fetcher: fetcher,
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Chunker: chunker,
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Addresses: contractAddresses,
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Topics: topic0s,
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}
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}
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func (watcher *Watcher) AddTransformers(us []shared.TransformerInitializer) {
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for _, transformerInitializer := range us {
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transformer := transformerInitializer(&watcher.DB)
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watcher.Transformers = append(watcher.Transformers, transformer)
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}
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}
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func (watcher *Watcher) Execute() error {
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// TODO Solve checkedHeadersColumn issue
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// TODO Handle start and end numbers in transformers?
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missingHeaders, err := shared.MissingHeaders(0, -1, &watcher.DB, "")
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for _, header := range missingHeaders {
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// TODO Extend FetchLogs for doing several blocks at a time
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logs, err := watcher.Fetcher.FetchLogs(watcher.Addresses, watcher.Topics, header)
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if err != nil {
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// TODO Handle fetch error in watcher
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return err
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}
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chunkedLogs := watcher.Chunker.ChunkLogs(logs)
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for _, transformer := range watcher.Transformers {
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// TODO delegate log chunks to respective transformers
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// Need to get the transformer name... :/
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logChunk := chunkedLogs["transformerName"]
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err = transformer.Execute(logChunk, missingHeaders)
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}
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}
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return err
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}
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