cic-chain-events/internal/syncer/janitor.go

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package syncer
import (
"context"
"time"
"github.com/alitto/pond"
"github.com/grassrootseconomics/cic-chain-events/internal/pipeline"
"github.com/grassrootseconomics/cic-chain-events/internal/store"
"github.com/jackc/pgx/v5"
"github.com/zerodha/logf"
)
const (
headBlockLag = 5
)
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type JanitorOpts struct {
BatchSize uint64
Logg logf.Logger
Pipeline *pipeline.Pipeline
Pool *pond.WorkerPool
Stats *Stats
Store store.Store[pgx.Rows]
SweepInterval time.Duration
}
type Janitor struct {
batchSize uint64
pipeline *pipeline.Pipeline
logg logf.Logger
pool *pond.WorkerPool
stats *Stats
store store.Store[pgx.Rows]
sweepInterval time.Duration
}
func NewJanitor(o JanitorOpts) *Janitor {
return &Janitor{
batchSize: o.BatchSize,
logg: o.Logg,
pipeline: o.Pipeline,
pool: o.Pool,
stats: o.Stats,
store: o.Store,
sweepInterval: o.SweepInterval,
}
}
func (j *Janitor) Start(ctx context.Context) error {
timer := time.NewTimer(j.sweepInterval)
for {
select {
case <-ctx.Done():
j.logg.Info("janitor: shutdown signal received")
return nil
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case <-timer.C:
j.logg.Debug("janitor: starting sweep")
if err := j.QueueMissingBlocks(context.Background()); err != nil {
j.logg.Error("janitor: queue missing blocks error", "error", err)
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}
timer.Reset(j.sweepInterval)
}
}
}
// QueueMissingBlocks searches for missing block and queues the block for processing.
// It will run twice for a given search range and only after, raise the lower bound.
func (j *Janitor) QueueMissingBlocks(ctx context.Context) error {
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if j.stats.GetHeadCursor() == 0 {
j.logg.Warn("janitor: (skipping) awaiting head synchronization")
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return nil
}
if j.pool.WaitingTasks() != 0 {
j.logg.Debug("janitor: (skipping) queue has pending jobs", "pending_jobs", j.pool.WaitingTasks())
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return nil
}
lowerBound, upperBound, err := j.store.GetSearchBounds(
ctx,
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j.batchSize,
j.stats.GetHeadCursor(),
headBlockLag,
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)
if err != nil {
return err
}
rows, err := j.store.GetMissingBlocks(ctx, lowerBound, upperBound)
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if err != nil {
return err
}
rowsProcessed := 0
for rows.Next() {
var blockNumber uint64
if err := rows.Scan(&blockNumber); err != nil {
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return err
}
j.pool.Submit(func() {
if err := j.pipeline.Run(ctx, blockNumber); err != nil {
j.logg.Error("janitor: pipeline run error", "error", err)
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}
})
rowsProcessed++
}
j.logg.Debug("janitor: missing blocks count", "count", rowsProcessed)
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if rowsProcessed == 0 {
j.logg.Info("janitor: no gap! rasing lower bound", "new_lower_bound", upperBound)
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j.stats.UpdateLowerBound(upperBound)
j.store.SetSearchLowerBound(ctx, upperBound)
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}
if rows.Err() != nil {
return err
}
return nil
}