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

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2023-01-05 12:45:09 +01:00
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"
)
type JanitorOpts struct {
BatchSize uint64
HeadBlockLag 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
headBlockLag 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,
headBlockLag: o.HeadBlockLag,
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 <-timer.C:
j.logg.Debug("janitor starting sweep")
if err := j.QueueMissingBlocks(); err != nil {
j.logg.Error("janitor error", "error", err)
}
timer.Reset(j.sweepInterval)
case <-ctx.Done():
j.logg.Debug("janitor shutdown signal received")
return nil
}
}
}
func (j *Janitor) QueueMissingBlocks() error {
if j.stats.GetHeadCursor() == 0 {
j.logg.Debug("janitor waiting for head synchronization")
return nil
}
if j.pool.WaitingTasks() >= j.batchSize {
j.logg.Debug("janitor skipping potential queue pressure")
return nil
}
lowerBound, upperBound, err := j.store.GetSearchBounds(
j.batchSize,
j.stats.GetHeadCursor(),
j.headBlockLag,
)
if err != nil {
return err
}
j.logg.Debug("janitor search bounds", "lower_bound", lowerBound, "upper_bound", upperBound)
rows, err := j.store.GetMissingBlocks(lowerBound, upperBound)
if err != nil {
return err
}
rowsProcessed := 0
for rows.Next() {
var n uint64
if err := rows.Scan(&n); err != nil {
return err
}
j.logg.Debug("submitting missing block for processing", "block", n)
j.pool.Submit(func() {
if err := j.pipeline.Run(n); err != nil {
j.logg.Error("pipeline run error", "error", err)
}
})
rowsProcessed++
}
j.logg.Debug("janitor missing block count", "count", rowsProcessed)
if rowsProcessed == 0 {
j.logg.Debug("no missing blocks, rasing lower bound")
j.stats.UpdateLowerBound(upperBound)
j.store.SetSearchLowerBound(upperBound)
}
if rows.Err() != nil {
return err
}
return nil
}