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blockstoremanager.go
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blockstoremanager.go
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package decision
import (
"context"
"errors"
"sync"
bstore "github.com/ipfs/boxo/blockstore"
blocks "github.com/ipfs/go-block-format"
cid "github.com/ipfs/go-cid"
ipld "github.com/ipfs/go-ipld-format"
"github.com/ipfs/go-metrics-interface"
)
// blockstoreManager maintains a pool of workers that make requests to the blockstore.
type blockstoreManager struct {
bs bstore.Blockstore
workerCount int
jobs chan func()
pendingGauge metrics.Gauge
activeGauge metrics.Gauge
workerWG sync.WaitGroup
stopChan chan struct{}
stopOnce sync.Once
}
// newBlockstoreManager creates a new blockstoreManager with the given context
// and number of workers
func newBlockstoreManager(
bs bstore.Blockstore,
workerCount int,
pendingGauge metrics.Gauge,
activeGauge metrics.Gauge,
) *blockstoreManager {
return &blockstoreManager{
bs: bs,
workerCount: workerCount,
jobs: make(chan func()),
pendingGauge: pendingGauge,
activeGauge: activeGauge,
stopChan: make(chan struct{}),
}
}
func (bsm *blockstoreManager) start() {
bsm.workerWG.Add(bsm.workerCount)
for i := 0; i < bsm.workerCount; i++ {
go bsm.worker()
}
}
func (bsm *blockstoreManager) stop() {
bsm.stopOnce.Do(func() {
close(bsm.stopChan)
})
bsm.workerWG.Wait()
}
func (bsm *blockstoreManager) worker() {
defer bsm.workerWG.Done()
for {
select {
case <-bsm.stopChan:
return
case job := <-bsm.jobs:
bsm.pendingGauge.Dec()
bsm.activeGauge.Inc()
job()
bsm.activeGauge.Dec()
}
}
}
func (bsm *blockstoreManager) addJob(ctx context.Context, job func()) error {
select {
case <-ctx.Done():
return ctx.Err()
case <-bsm.stopChan:
return errors.New("shutting down")
case bsm.jobs <- job:
bsm.pendingGauge.Inc()
return nil
}
}
func (bsm *blockstoreManager) getBlockSizes(ctx context.Context, ks []cid.Cid) (map[cid.Cid]int, error) {
res := make(map[cid.Cid]int)
if len(ks) == 0 {
return res, nil
}
var lk sync.Mutex
return res, bsm.jobPerKey(ctx, ks, func(c cid.Cid) {
size, err := bsm.bs.GetSize(ctx, c)
if err != nil {
if !ipld.IsNotFound(err) {
// Note: this isn't a fatal error. We shouldn't abort the request
log.Errorf("blockstore.GetSize(%s) error: %s", c, err)
}
} else {
lk.Lock()
res[c] = size
lk.Unlock()
}
})
}
func (bsm *blockstoreManager) getBlocks(ctx context.Context, ks []cid.Cid) (map[cid.Cid]blocks.Block, error) {
res := make(map[cid.Cid]blocks.Block, len(ks))
if len(ks) == 0 {
return res, nil
}
var lk sync.Mutex
return res, bsm.jobPerKey(ctx, ks, func(c cid.Cid) {
blk, err := bsm.bs.Get(ctx, c)
if err != nil {
if !ipld.IsNotFound(err) {
// Note: this isn't a fatal error. We shouldn't abort the request
log.Errorf("blockstore.Get(%s) error: %s", c, err)
}
return
}
lk.Lock()
res[c] = blk
lk.Unlock()
})
}
func (bsm *blockstoreManager) jobPerKey(ctx context.Context, ks []cid.Cid, jobFn func(c cid.Cid)) error {
var err error
var wg sync.WaitGroup
for _, k := range ks {
c := k
wg.Add(1)
err = bsm.addJob(ctx, func() {
jobFn(c)
wg.Done()
})
if err != nil {
wg.Done()
break
}
}
wg.Wait()
return err
}