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package ingest
import (
"errors"
"fmt"
"io"
"io/fs"
"slices"
"lindenii.org/go/furgit/internal/format/packidx"
"lindenii.org/go/furgit/internal/format/packidx/bloom"
"lindenii.org/go/furgit/internal/format/packrev"
"lindenii.org/go/furgit/object/id"
"lindenii.org/go/lgo/intconv"
)
// finalize writes the index and reverse index,
// then links the pack, reverse index, and index
// to their content-addressed names.
func (ingestion *ingestion) finalize() (Result, error) {
entries, positions, err := ingestion.indexEntries()
if err != nil {
return Result{}, err
}
packHash := ingestion.packHash.Bytes()
idxTmp, err := ingestion.writeTemp("tmp_idx_", func(w io.Writer) error {
return packidx.Write(w, ingestion.objectFormat, entries, packHash)
})
if err != nil {
return Result{}, err
}
revTmp, err := ingestion.writeTemp("tmp_rev_", func(w io.Writer) error {
return packrev.Write(w, ingestion.objectFormat, positions, packHash)
})
if err != nil {
return Result{}, err
}
bloomBuilder, err := ingestion.buildBloom(entries, packHash)
if err != nil {
return Result{}, err
}
bloomTmp, err := ingestion.writeTemp("tmp_bloom_", func(w io.Writer) error {
_, err := w.Write(bloomBuilder.Bytes())
return err
})
if err != nil {
return Result{}, err
}
base := "pack-" + ingestion.packHash.String()
packFinal := base + ".pack"
idxFinal := base + ".idx"
revFinal := base + ".rev"
bloomFinal := base + ".bloom"
// Link the pack, reverse index, and Bloom filter before the index,
// since the index is what publishes the pack to readers.
err = ingestion.link(ingestion.packTmp, packFinal)
if err != nil {
return Result{}, err
}
err = ingestion.link(revTmp, revFinal)
if err != nil {
return Result{}, err
}
err = ingestion.link(bloomTmp, bloomFinal)
if err != nil {
return Result{}, err
}
err = ingestion.link(idxTmp, idxFinal)
if err != nil {
return Result{}, err
}
objectCount, err := intconv.IntToUint32(len(ingestion.records))
if err != nil {
return Result{}, fmt.Errorf("object/store/packed/internal/ingest: %w", err)
}
return Result{
PackName: packFinal,
IdxName: idxFinal,
RevName: revFinal,
BloomName: bloomFinal,
PackHash: ingestion.packHash,
ObjectCount: objectCount,
ThinFixed: ingestion.thinFixed,
}, nil
}
// buildBloom builds a Bloom filter over the index entries' object IDs,
// bound to packHash.
func (ingestion *ingestion) buildBloom(entries []packidx.Entry, packHash []byte) (*bloom.Builder, error) {
bucketCount, k, err := bloom.RecommendParams(ingestion.objectFormat, len(entries))
if err != nil {
return nil, fmt.Errorf("object/store/packed/internal/ingest: %w", err)
}
builder, err := bloom.NewBuilder(ingestion.objectFormat, bucketCount, k, packHash)
if err != nil {
return nil, fmt.Errorf("object/store/packed/internal/ingest: %w", err)
}
size := ingestion.objectFormat.Size()
for i := range entries {
builder.Add(entries[i].OID[:size])
}
return builder, nil
}
// indexEntries returns the index entries in object-ID order
// and, for each record in pack order, its position in that index order.
func (ingestion *ingestion) indexEntries() ([]packidx.Entry, []uint32, error) {
order := make([]int, len(ingestion.records))
for i := range order {
order[i] = i
}
slices.SortFunc(order, func(left, right int) int {
return ingestion.records[left].oid.Compare(ingestion.records[right].oid)
})
entries := make([]packidx.Entry, len(order))
positions := make([]uint32, len(ingestion.records))
for indexPosition, recordIndex := range order {
rec := &ingestion.records[recordIndex]
var oidBytes [id.MaxObjectIDSize]byte
copy(oidBytes[:], rec.oid.RawBytes())
offset, err := intconv.IntToUint64(rec.offset)
if err != nil {
return nil, nil, fmt.Errorf("object/store/packed/internal/ingest: %w", err)
}
entries[indexPosition] = packidx.Entry{
OID: oidBytes,
Offset: offset,
CRC32: rec.crc32,
}
position, err := intconv.IntToUint32(indexPosition)
if err != nil {
return nil, nil, fmt.Errorf("object/store/packed/internal/ingest: %w", err)
}
positions[recordIndex] = position
}
return entries, positions, nil
}
// writeTemp creates a temporary file,
// writes it via write, syncs it, and returns its name.
func (ingestion *ingestion) writeTemp(prefix string, write func(io.Writer) error) (string, error) {
name, file, err := ingestion.createTemp(prefix)
if err != nil {
return "", err
}
defer func() { _ = file.Close() }()
err = write(file)
if err != nil {
return "", err
}
err = file.Sync()
if err != nil {
return "", fmt.Errorf("object/store/packed/internal/ingest: syncing %q: %w", name, err)
}
return name, nil
}
// link hard-links tmp to final,
// treating an already-present destination as success.
func (ingestion *ingestion) link(tmp, final string) error {
err := ingestion.root.Link(tmp, final)
if err != nil && !errors.Is(err, fs.ErrExist) {
return fmt.Errorf("object/store/packed/internal/ingest: linking %q: %w", final, err)
}
_ = ingestion.root.Remove(tmp)
return nil
}
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