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symbols_writer_file.go
161 lines (144 loc) · 3.33 KB
/
symbols_writer_file.go
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package symdb
import (
"bufio"
"fmt"
"hash/crc32"
"io"
"os"
"path/filepath"
"github.com/grafana/dskit/multierror"
)
type Writer struct {
dir string
idx IndexFile
scd *fileWriter
}
func NewWriter(dir string) *Writer {
return &Writer{
dir: dir,
idx: IndexFile{
Header: Header{
Magic: symdbMagic,
Version: FormatV1,
},
},
}
}
func (w *Writer) writeStacktraceChunk(ci int, c *stacktraceChunk) (err error) {
if w.scd == nil {
if err = w.createStacktracesFile(); err != nil {
return err
}
}
h := StacktraceChunkHeader{
Offset: w.scd.w.offset,
Size: 0, // Set later.
Partition: c.parition.name,
ChunkIndex: uint16(ci),
ChunkEncoding: ChunkEncodingGroupVarint,
Stacktraces: c.stacks,
StacktraceNodes: c.tree.len(),
StacktraceMaxDepth: 0, // TODO
StacktraceMaxNodes: c.parition.maxNodesPerChunk,
CRC: 0, // Set later.
}
crc := crc32.New(castagnoli)
if h.Size, err = c.WriteTo(io.MultiWriter(crc, w.scd)); err != nil {
return fmt.Errorf("writing stacktrace chunk data: %w", err)
}
h.CRC = crc.Sum32()
w.idx.StacktraceChunkHeaders.Entries = append(w.idx.StacktraceChunkHeaders.Entries, h)
return nil
}
func (w *Writer) Flush() (err error) {
if err = w.createDir(); err != nil {
return err
}
if w.scd != nil {
if err = w.scd.Close(); err != nil {
return fmt.Errorf("flushing stacktraces: %w", err)
}
}
// Write the index file only after all the files were flushed.
f, err := w.newFile(IndexFileName)
if err != nil {
return err
}
defer func() {
err = multierror.New(err, f.Close()).Err()
}()
if _, err = w.idx.WriteTo(f); err != nil {
return fmt.Errorf("failed to write index file: %w", err)
}
return nil
}
func (w *Writer) createDir() error {
if err := os.MkdirAll(w.dir, 0o755); err != nil {
return fmt.Errorf("failed to create directory %q: %w", w.dir, err)
}
return nil
}
func (w *Writer) createStacktracesFile() (err error) {
if err = w.createDir(); err != nil {
return err
}
w.scd, err = w.newFile(StacktracesFileName)
return err
}
func (w *Writer) newFile(name string) (f *fileWriter, err error) {
name = filepath.Join(w.dir, name)
if f, err = newFileWriter(name); err != nil {
return nil, fmt.Errorf("failed to create %q: %w", name, err)
}
return f, err
}
type fileWriter struct {
name string
buf *bufio.Writer
f *os.File
w *writerOffset
}
func newFileWriter(name string) (*fileWriter, error) {
f, err := os.Create(name)
if err != nil {
return nil, err
}
// There is no particular reason to use
// a buffer larger than the default 4K.
b := bufio.NewWriterSize(f, 4096)
w := withWriterOffset(b, 0)
fw := fileWriter{
name: name,
buf: b,
f: f,
w: w,
}
return &fw, nil
}
func (f *fileWriter) Write(p []byte) (n int, err error) {
return f.w.Write(p)
}
func (f *fileWriter) sync() (err error) {
if err = f.buf.Flush(); err != nil {
return err
}
return f.f.Sync()
}
func (f *fileWriter) Close() (err error) {
if err = f.sync(); err != nil {
return err
}
return f.f.Close()
}
type writerOffset struct {
io.Writer
offset int64
}
func withWriterOffset(w io.Writer, base int64) *writerOffset {
return &writerOffset{Writer: w, offset: base}
}
func (w *writerOffset) Write(p []byte) (n int, err error) {
n, err = w.Writer.Write(p)
w.offset += int64(n)
return n, err
}