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package processor
import (
"time"
"github.com/ethereum-optimism/optimism/indexer/database"
"github.com/ethereum-optimism/optimism/indexer/node"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/log"
)
const (
defaultLoopInterval = 5 * time.Second
defaultHeaderBufferSize = 500
)
// ProcessFn is the the entrypoint for processing a batch of headers.
// In the event of failure, database operations are rolled back
type ProcessFn func(*database.DB, []*types.Header) error
type processor struct {
headerTraversal *node.HeaderTraversal
db *database.DB
processFn ProcessFn
processLog log.Logger
}
// Start kicks off the processing loop
func (p processor) Start() {
pollTicker := time.NewTicker(defaultLoopInterval)
defer pollTicker.Stop()
p.processLog.Info("starting processor...")
var unprocessedHeaders []*types.Header
for range pollTicker.C {
if len(unprocessedHeaders) == 0 {
newHeaders, err := p.headerTraversal.NextFinalizedHeaders(defaultHeaderBufferSize)
if err != nil {
p.processLog.Error("error querying for headers", "err", err)
continue
} else if len(newHeaders) == 0 {
// Logged as an error since this loop should be operating at a longer interval than the provider
p.processLog.Error("no new headers. processor unexpectedly at head...")
continue
}
unprocessedHeaders = newHeaders
} else {
p.processLog.Info("retrying previous batch")
}
firstHeader := unprocessedHeaders[0]
lastHeader := unprocessedHeaders[len(unprocessedHeaders)-1]
batchLog := p.processLog.New("batch_start_block_number", firstHeader.Number, "batch_end_block_number", lastHeader.Number)
batchLog.Info("processing batch")
err := p.db.Transaction(func(db *database.DB) error {
return p.processFn(db, unprocessedHeaders)
})
if err != nil {
batchLog.Warn("error processing batch. no operations committed", "err", err)
} else {
batchLog.Info("fully committed batch")
unprocessedHeaders = nil
}
}
}