/
blockstoremanager.go
118 lines (103 loc) · 2.34 KB
/
blockstoremanager.go
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package decision
import (
"context"
"sync"
blocks "github.com/ipfs/go-block-format"
cid "github.com/ipfs/go-cid"
bstore "github.com/ipfs/go-ipfs-blockstore"
process "github.com/jbenet/goprocess"
)
// blockstoreManager maintains a pool of workers that make requests to the blockstore.
type blockstoreManager struct {
bs bstore.Blockstore
workerCount int
jobs chan func()
px process.Process
}
// newBlockstoreManager creates a new blockstoreManager with the given context
// and number of workers
func newBlockstoreManager(ctx context.Context, bs bstore.Blockstore, workerCount int) *blockstoreManager {
return &blockstoreManager{
bs: bs,
workerCount: workerCount,
jobs: make(chan func()),
}
}
func (bsm *blockstoreManager) start(px process.Process) {
bsm.px = px
// Start up workers
for i := 0; i < bsm.workerCount; i++ {
px.Go(func(px process.Process) {
bsm.worker()
})
}
}
func (bsm *blockstoreManager) worker() {
for {
select {
case <-bsm.px.Closing():
return
case job := <-bsm.jobs:
job()
}
}
}
func (bsm *blockstoreManager) addJob(ctx context.Context, job func()) {
select {
case <-ctx.Done():
case <-bsm.px.Closing():
case bsm.jobs <- job:
}
}
func (bsm *blockstoreManager) getBlockSizes(ctx context.Context, ks []cid.Cid) map[cid.Cid]int {
res := make(map[cid.Cid]int)
if len(ks) == 0 {
return res
}
var lk sync.Mutex
bsm.jobPerKey(ctx, ks, func(c cid.Cid) {
size, err := bsm.bs.GetSize(c)
if err != nil {
if err != bstore.ErrNotFound {
log.Errorf("blockstore.GetSize(%s) error: %s", c, err)
}
} else {
lk.Lock()
res[c] = size
lk.Unlock()
}
})
return res
}
func (bsm *blockstoreManager) getBlocks(ctx context.Context, ks []cid.Cid) map[cid.Cid]blocks.Block {
res := make(map[cid.Cid]blocks.Block)
if len(ks) == 0 {
return res
}
var lk sync.Mutex
bsm.jobPerKey(ctx, ks, func(c cid.Cid) {
blk, err := bsm.bs.Get(c)
if err != nil {
if err != bstore.ErrNotFound {
log.Errorf("blockstore.Get(%s) error: %s", c, err)
}
} else {
lk.Lock()
res[c] = blk
lk.Unlock()
}
})
return res
}
func (bsm *blockstoreManager) jobPerKey(ctx context.Context, ks []cid.Cid, jobFn func(c cid.Cid)) {
wg := sync.WaitGroup{}
for _, k := range ks {
c := k
wg.Add(1)
bsm.addJob(ctx, func() {
jobFn(c)
wg.Done()
})
}
wg.Wait()
}