/
batch.go
99 lines (83 loc) · 2.09 KB
/
batch.go
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package merkledag
import (
"runtime"
cid "gx/ipfs/QmNp85zy9RLrQ5oQD4hPyS39ezrrXpcaa7R4Y9kxdWQLLQ/go-cid"
node "gx/ipfs/QmPN7cwmpcc4DWXb4KTB9dNAJgjuPY69h3npsMfhRrQL9c/go-ipld-format"
blocks "gx/ipfs/QmSn9Td7xgxm9EV7iEjTckpUWmWApggzPxu7eFGWkkpwin/go-block-format"
)
// ParallelBatchCommits is the number of batch commits that can be in-flight before blocking.
// TODO(#4299): Experiment with multiple datastores, storage devices, and CPUs to find
// the right value/formula.
var ParallelBatchCommits = runtime.NumCPU() * 2
// Batch is a buffer for batching adds to a dag.
type Batch struct {
ds *dagService
activeCommits int
commitError error
commitResults chan error
blocks []blocks.Block
size int
MaxSize int
MaxBlocks int
}
func (t *Batch) processResults() {
for t.activeCommits > 0 && t.commitError == nil {
select {
case err := <-t.commitResults:
t.activeCommits--
if err != nil {
t.commitError = err
}
default:
return
}
}
}
func (t *Batch) asyncCommit() {
numBlocks := len(t.blocks)
if numBlocks == 0 || t.commitError != nil {
return
}
if t.activeCommits >= ParallelBatchCommits {
err := <-t.commitResults
t.activeCommits--
if err != nil {
t.commitError = err
return
}
}
go func(b []blocks.Block) {
_, err := t.ds.Blocks.AddBlocks(b)
t.commitResults <- err
}(t.blocks)
t.activeCommits++
t.blocks = make([]blocks.Block, 0, numBlocks)
t.size = 0
return
}
// Add adds a node to the batch and commits the batch if necessary.
func (t *Batch) Add(nd node.Node) (*cid.Cid, error) {
// Not strictly necessary but allows us to catch errors early.
t.processResults()
if t.commitError != nil {
return nil, t.commitError
}
t.blocks = append(t.blocks, nd)
t.size += len(nd.RawData())
if t.size > t.MaxSize || len(t.blocks) > t.MaxBlocks {
t.asyncCommit()
}
return nd.Cid(), t.commitError
}
// Commit commits batched nodes.
func (t *Batch) Commit() error {
t.asyncCommit()
for t.activeCommits > 0 && t.commitError == nil {
err := <-t.commitResults
t.activeCommits--
if err != nil {
t.commitError = err
}
}
return t.commitError
}