chore: fixes to lsm
This commit is contained in:
parent
36460a131e
commit
cf99e18a39
GPG Key ID:
8B3B0604F164E04F
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@ -6,19 +6,25 @@ import (
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"io"
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"iter"
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"os"
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"path/filepath"
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"github.com/docopt/docopt-go"
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"go.sour.is/pkg/lsm2"
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)
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var usage = `
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Usage: lsm2 create <archive> <files>...`
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Usage:
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lsm2 create <archive> <files>...
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lsm2 append <archive> <files>...
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lsm2 read <archive> <index>`
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type args struct {
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Create bool
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Append bool
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Read bool
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Archive string `docopt:"<archive>"`
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Files []string `docopt:"<files>"`
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Index int64 `docopt:"<index>"`
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}
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func main() {
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@ -45,36 +51,65 @@ func (c console) Write(b []byte) (int, error) {
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return c.Stdout.Write(b)
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}
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func run(console console, args args) error {
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func run(console console,a args) error {
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fmt.Fprintln(console, "lsm")
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switch {
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case args.Create:
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fmt.Fprintf(console, "creating %s from %v\n", filepath.Base(args.Archive), args.Files)
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out, err := os.OpenFile(args.Archive, os.O_CREATE|os.O_WRONLY, 0644)
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case a.Create:
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f, err := os.OpenFile(a.Archive, os.O_CREATE|os.O_WRONLY, 0644)
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if err != nil {
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return err
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}
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defer out.Close()
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defer f.Close()
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filesWritten := 0
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defer func() { fmt.Fprintln(console, "wrote", filesWritten, "files") }()
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return lsm2.WriteLogFile(f, fileReaders(a.Files))
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case a.Append:
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f, err := os.OpenFile(a.Archive, os.O_RDWR, 0644)
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if err != nil {
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return err
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}
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defer f.Close()
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return lsm2.WriteIter(out, iter.Seq[io.Reader](func(yield func(io.Reader) bool) {
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for _, name := range args.Files {
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return lsm2.AppendLogFile(f, fileReaders(a.Files))
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case a.Read:
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fmt.Fprintln(console, "reading", a.Archive)
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f, err := os.Open(a.Archive)
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if err != nil {
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return err
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}
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defer f.Close()
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lg, err := lsm2.ReadLogFile(f)
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if err != nil {
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return err
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}
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for i, rd := range lg.Iter() {
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fmt.Fprintf(console, "=========================\n%d:\n", i)
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io.Copy(console, rd)
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fmt.Fprintln(console, "=========================")
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}
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if lg.Err != nil {
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return lg.Err
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}
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return nil
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default:
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return errors.New("unknown command")
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}
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}
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func fileReaders(names []string) iter.Seq[io.Reader] {
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return iter.Seq[io.Reader](func(yield func(io.Reader) bool) {
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for _, name := range names {
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f, err := os.Open(name)
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if err != nil {
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continue
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}
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filesWritten++
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if !yield(f) {
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f.Close()
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return
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}
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f.Close()
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}
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}))
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default:
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return errors.New("unknown command")
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}
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})
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}
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func must[T any](v T, err error) T {
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286
lsm2/sst.go
286
lsm2/sst.go
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@ -1,7 +1,5 @@
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package lsm2
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// [Sour.is|size] [size|hash][data][hash|flag|size]... [prev|count|flag|size]
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import (
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"encoding/binary"
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"errors"
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@ -11,6 +9,28 @@ import (
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"iter"
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)
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// [Sour.is|size] [size|hash][data][hash|flag|size]... [prev|count|flag|size]
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// Commit1: [magic>|<end]{10} ... [<count][<size][<flag]{3..30}
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// +---------|--------------------------------> end = seek to end of file
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// <---|-------------+ size = seek to magic header
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// <---|-------------+10 size + 10 = seek to start of file
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// <-----------------------------T+10----------------> 10 + size + trailer = full file size
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// Commit2: [magic>|<end]{10} ... [<count][<size][<flag]{3..30} ... [<prev][<count][<size][<flag]{4..40}
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// <---|---------+
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// <-------------+T----------------->
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// +--------|------------------------------------------------------------------------->
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// <-------------------------------------|----------------+
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// prev = seek to last commit <---|-+
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// prev + trailer = size of commit <----T+--------------------------------->
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// Block: [hash>|<end]{10} ... [<size][<flag]{2..20}
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// +---------|------------------------> end = seek to end of block
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// <---|-+ size = seek to end of header
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// <-------------------|-+10 size + 10 = seek to start of block
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// <---------------------T+10---------------> size + 10 + trailer = full block size
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const (
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TypeUnknown uint64 = iota
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TypeSegment
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@ -39,40 +59,28 @@ type header struct {
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extra []byte
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}
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// UnmarshalBinary implements encoding.BinaryUnmarshaler.
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// It decodes the input binary data into the header struct.
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// The function expects the input data to be of a specific size (headerSize),
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// otherwise it returns an error indicating bad data.
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// It reads the 'end' field from the binary data, updates the 'extra' field,
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// and reverses the byte order of 'extra' in place.
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func (h *header) UnmarshalBinary(data []byte) error {
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if len(data) != 10 {
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if len(data) != headerSize {
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return fmt.Errorf("%w: bad data", ErrDecode)
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}
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h.extra = append(h.extra, data...)
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var n int
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h.end, n = binary.Uvarint(h.extra)
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h.extra = make([]byte, headerSize)
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copy(h.extra, data)
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var bytesRead int
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h.end, bytesRead = binary.Uvarint(h.extra)
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reverse(h.extra)
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h.extra = h.extra[:len(h.extra)-n]
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h.extra = h.extra[:headerSize-bytesRead]
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return nil
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}
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// Commit1: [magic>|<end]{10} ... [<count][<size][<flag]{3..30}
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// +---------|--------------------------------> end = seek to end of file
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// <---|-------------+ size = seek to magic header
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// <---|-------------+10 size + 10 = seek to start of file
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// <-----------------------------T+10----------------> 10 + size + trailer = full file size
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// Commit2: [magic>|<end]{10} ... [<count][<size][<flag]{3..30} ... [<prev][<count][<size][<flag]{4..40}
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// <---|---------+
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// <-------------+T----------------->
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// +--------|------------------------------------------------------------------------->
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// <-------------------------------------|----------------+
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// prev = seek to last commit <---|-+
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// prev + trailer = size of commit <----T+--------------------------------->
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// Block: [hash>|<end]{10} ... [<size][<flag]{2..20}
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// +---------|------------------------> end = seek to end of block
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// <---|-+ size = seek to end of header
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// <-------------------|-+10 size + 10 = seek to start of block
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// <---------------------T+10---------------> size + 10 + trailer = full block size
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type Commit struct {
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flag uint64 // flag values
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size uint64 // size of the trailer
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@ -85,18 +93,18 @@ type Commit struct {
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// Append marshals the trailer into binary form and appends it to data.
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// It returns the new slice.
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func (h *Commit) AppendTrailer(data []byte) []byte {
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h.flag |= TypePrevCommit
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if h.prev == 0 {
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h.flag &= TypeCommit
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}
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h.flag |= TypeCommit
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// if h.prev > 0 {
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// h.flag |= TypePrevCommit
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// }
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size := len(data)
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data = binary.AppendUvarint(data, h.size)
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data = binary.AppendUvarint(data, h.flag)
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data = binary.AppendUvarint(data, h.count)
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if h.prev != 0 {
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data = binary.AppendUvarint(data, h.prev)
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}
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// if h.prev > 0 {
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// data = binary.AppendUvarint(data, h.prev)
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// }
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reverse(data[size:])
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return data
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@ -123,7 +131,7 @@ func (h *Commit) UnmarshalBinary(data []byte) error {
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data = data[n:]
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h.tsize += n
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h.prev = h.size
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// h.prev = h.size
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if h.flag&TypePrevCommit == TypePrevCommit {
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h.prev, n = binary.Uvarint(data)
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h.tsize += n
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@ -207,9 +215,6 @@ func (h *logFile) AppendMagic(data []byte) []byte {
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return data
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}
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func (h *logFile) UnmarshalBinary(data []byte) error {
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return h.header.UnmarshalBinary(data)
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}
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// WriteLogFile writes a log file to w, given a list of segments.
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// The caller is responsible for calling WriteAt on the correct offset.
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@ -223,7 +228,7 @@ func (h *logFile) UnmarshalBinary(data []byte) error {
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// - A footer with the length and hash of the segment
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// - The contents of the segment
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// - A header with the magic, version, flag (Clean), and end offset
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func WriteLogFile(w io.WriterAt, segments ...io.Reader) error {
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func WriteLogFile(w io.WriterAt, segments iter.Seq[io.Reader]) error {
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_, err := w.WriteAt(Magic[:], 0)
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if err != nil {
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return err
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@ -233,13 +238,7 @@ func WriteLogFile(w io.WriterAt, segments ...io.Reader) error {
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WriterAt: w,
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}
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return lf.writeIter(w, iter.Seq[io.Reader](func(yield func(io.Reader) bool) {
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for _, s := range segments {
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if !yield(s) {
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return
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}
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}
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}))
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return lf.writeIter(segments)
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}
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type rw interface {
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@ -247,7 +246,7 @@ type rw interface {
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io.WriterAt
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}
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func AppendLogFile(rw rw, segments ...io.Reader) error {
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func AppendLogFile(rw rw, segments iter.Seq[io.Reader]) error {
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logFile, err := ReadLogFile(rw)
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if err != nil {
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return err
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@ -256,35 +255,19 @@ func AppendLogFile(rw rw, segments ...io.Reader) error {
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WriterAt: rw,
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logFile: logFile.logFile,
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}
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return lf.writeIter(rw, iter.Seq[io.Reader](func(yield func(io.Reader) bool) {
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for _, s := range segments {
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if !yield(s) {
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return
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}
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}
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}))
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return lf.writeIter( segments)
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}
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func WriteIter(w io.WriterAt, segments iter.Seq[io.Reader]) error {
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_, err := w.WriteAt(Magic[:], 0)
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if err != nil {
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return err
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}
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lf := &LogWriter{
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WriterAt: w,
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}
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return lf.writeIter(w, segments)
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}
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func (lf *LogWriter) writeIter(w io.WriterAt, segments iter.Seq[io.Reader]) error {
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func (lf *LogWriter) writeIter(segments iter.Seq[io.Reader]) error {
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lf.size = 0
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for s := range segments {
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err := lf.writeSegment(s)
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n, err := lf.writeBlock(s)
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if err != nil {
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return err
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}
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lf.end += n
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lf.size += n
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lf.count++
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}
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@ -297,7 +280,7 @@ func (lf *LogWriter) writeIter(w io.WriterAt, segments iter.Seq[io.Reader]) erro
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}
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lf.end += uint64(n)
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_, err = w.WriteAt(lf.AppendMagic(make([]byte, 0, 10)), 0)
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_, err = lf.WriteAt(lf.AppendMagic(make([]byte, 0, 10)), 0)
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return err
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}
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@ -307,24 +290,26 @@ type LogWriter struct {
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io.WriterAt
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}
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// writeSegment writes a segment to the log file at the current end of file position.
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// writeBlock writes a segment to the log file at the current end of file position.
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// The segment is written in chunks of 1024 bytes, and the hash of the segment
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func (lf *LogWriter) writeSegment(segment io.Reader) error {
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func (lf *LogWriter) writeBlock(segment io.Reader) (uint64, error) {
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h := hash()
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head := Block{}
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block := Block{}
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start := int64(lf.end) + 10
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end := int64(lf.end) + 10
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end := start
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bytesWritten := 0
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// Write the header to the log file.
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// The footer is written at the current end of file position.
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n, err := lf.WriteAt(make([]byte, headerSize), start)
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bytesWritten += n
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end += int64(n)
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if err != nil {
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// If there is an error, return it.
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return err
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return uint64(bytesWritten), err
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}
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end += int64(n)
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lf.size += uint64(n)
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lf.end += uint64(n)
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// Write the segment to the log file.
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// The segment is written in chunks of 1024 bytes.
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@ -338,7 +323,7 @@ func (lf *LogWriter) writeSegment(segment io.Reader) error {
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break
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}
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// If there is an error, return it.
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return err
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return uint64(bytesWritten), err
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}
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// Compute the hash of the chunk.
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@ -346,42 +331,41 @@ func (lf *LogWriter) writeSegment(segment io.Reader) error {
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// Write the chunk to the log file.
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// The chunk is written at the current end of file position.
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_, err = lf.WriteAt(buf[:n], end)
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n, err = lf.WriteAt(buf[:n], end)
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bytesWritten += n
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if err != nil {
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// If there is an error, return it.
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return err
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return uint64(bytesWritten), err
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}
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// Update the length of the segment.
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end += int64(n)
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head.size += uint64(n)
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block.size += uint64(n)
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}
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head.extra = h.Sum(nil)
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head.end += head.size
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block.extra = h.Sum(nil)
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block.end += block.size
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// Write the footer to the log file.
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// The footer is written at the current end of file position.
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n, err = lf.WriteAt(head.AppendTrailer(make([]byte, 0, maxBlockSize)), end)
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n, err = lf.WriteAt(block.AppendTrailer(make([]byte, 0, maxBlockSize)), end)
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bytesWritten += n
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if err != nil {
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// If there is an error, return it.
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return err
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return uint64(bytesWritten), err
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}
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end += int64(n)
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head.end += uint64(n)
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block.end += uint64(n)
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// Update header to the log file.
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// The footer is written at the current end of file position.
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_, err = lf.WriteAt(head.AppendHeader(make([]byte, 0, headerSize)), start)
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_, err = lf.WriteAt(block.AppendHeader(make([]byte, 0, headerSize)), start)
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if err != nil {
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// If there is an error, return it.
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return err
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return uint64(bytesWritten), err
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}
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// Update the end of file position.
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lf.size += head.end
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lf.end += head.end
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return nil
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return uint64(bytesWritten), nil
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}
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// reverse reverses a slice in-place.
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@ -446,16 +430,18 @@ func (lf *LogReader) Iter() iter.Seq2[uint64, io.Reader] {
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return func(yield func(uint64, io.Reader) bool) {
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start := int64(10)
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var adj uint64
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for _, commit := range commits {
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size := int64(commit.prev)
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size := int64(commit.size)
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it := iterBlocks(io.NewSectionReader(lf, start, size), size)
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for i, block := range it {
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if !yield(i, block) {
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if !yield(adj+i, block) {
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return
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}
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}
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start += size + int64(commit.tsize)
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adj = commit.count
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}
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}
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}
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@ -464,9 +450,10 @@ func iterBlocks(r io.ReaderAt, end int64) iter.Seq2[uint64, io.Reader] {
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var start int64
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var i uint64
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return func(yield func(uint64, io.Reader) bool) {
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buf := make([]byte, maxBlockSize)
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for start < end {
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block := &Block{}
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buf := make([]byte, 10)
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buf = buf[:10]
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n, err := rsr(r, int64(start), 10).ReadAt(buf, 0)
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if n == 0 && err != nil {
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return
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@ -476,8 +463,7 @@ func iterBlocks(r io.ReaderAt, end int64) iter.Seq2[uint64, io.Reader] {
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if err := block.header.UnmarshalBinary(buf); err != nil {
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return
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}
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buf = make([]byte, maxBlockSize)
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buf = buf[:maxBlockSize]
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n, err = rsr(r, int64(start), int64(block.end)).ReadAt(buf, 0)
|
||||
if n == 0 && err != nil {
|
||||
return
|
||||
|
|
@ -498,15 +484,12 @@ func iterBlocks(r io.ReaderAt, end int64) iter.Seq2[uint64, io.Reader] {
|
|||
}
|
||||
}
|
||||
|
||||
|
||||
func (lf *LogReader) iterCommits() iter.Seq[Commit] {
|
||||
eof := lf.end + 10
|
||||
|
||||
if eof <= 10 {
|
||||
if lf.end == 0 {
|
||||
return func(yield func(Commit) bool) {}
|
||||
}
|
||||
|
||||
offset := eof - 10 - lf.prev - uint64(lf.tsize)
|
||||
offset := lf.end - lf.size - uint64(lf.tsize)
|
||||
return func(yield func(Commit) bool) {
|
||||
if !yield(lf.Commit) {
|
||||
return
|
||||
|
|
@ -529,50 +512,40 @@ func (lf *LogReader) iterCommits() iter.Seq[Commit] {
|
|||
if !yield(commit) {
|
||||
return
|
||||
}
|
||||
offset -= commit.prev + uint64(commit.tsize)
|
||||
offset -= commit.size + uint64(commit.tsize)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// func (lf *LogReader) Rev() iter.Seq2[uint64, io.Reader] {
|
||||
// end := lf.end + 10
|
||||
// i := lf.count
|
||||
// return func(yield func(uint64, io.Reader) bool) {
|
||||
func (lf *LogReader) Rev() iter.Seq2[uint64, io.Reader] {
|
||||
end := lf.end + 10
|
||||
i := lf.count
|
||||
return func(yield func(uint64, io.Reader) bool) {
|
||||
|
||||
// for commit := range lf.iterCommits() {
|
||||
// end -= uint64(commit.tsize)
|
||||
// start := end - commit.prev - uint64(commit.tsize)
|
||||
// for start > end{
|
||||
// block := &Block{}
|
||||
// buf := make([]byte, min(maxBlockSize, commit.size))
|
||||
// n, err := lf.ReaderAt.ReadAt(buf, max(0, int64(end)-int64(len(buf))))
|
||||
// if n == 0 && err != nil {
|
||||
// lf.Err = err
|
||||
// return
|
||||
// }
|
||||
// buf = buf[:n]
|
||||
// err = block.UnmarshalBinary(buf)
|
||||
// if err != nil {
|
||||
// lf.Err = err
|
||||
// return
|
||||
// }
|
||||
// if !yield(i, io.NewSectionReader(lf, int64(end-block.size)-int64(block.tsize), int64(block.size))) {
|
||||
// return
|
||||
// }
|
||||
// end -= block.size + 10 + uint64(block.tsize)
|
||||
// i--
|
||||
// }
|
||||
|
||||
// }
|
||||
// }
|
||||
// }
|
||||
|
||||
func iterOne[I, T any](it iter.Seq2[I, T]) iter.Seq[T] {
|
||||
return func(yield func(T) bool) {
|
||||
for _, v := range it {
|
||||
if !yield(v) {
|
||||
for commit := range lf.iterCommits() {
|
||||
end -= uint64(commit.tsize)
|
||||
start := end - commit.size
|
||||
for start < end {
|
||||
block := &Block{}
|
||||
buf := make([]byte, maxBlockSize)
|
||||
n, err := rsr(lf, int64(start), int64(commit.size)).ReadAt(buf, 0)
|
||||
if n == 0 && err != nil {
|
||||
lf.Err = err
|
||||
return
|
||||
}
|
||||
buf = buf[:n]
|
||||
err = block.UnmarshalBinary(buf)
|
||||
if err != nil {
|
||||
lf.Err = err
|
||||
return
|
||||
}
|
||||
if !yield(i-1, io.NewSectionReader(lf, int64(end-block.size)-int64(block.tsize), int64(block.size))) {
|
||||
return
|
||||
}
|
||||
end -= block.size + 10 + uint64(block.tsize)
|
||||
i--
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -606,36 +579,3 @@ func (r *revSegmentReader) ReadAt(data []byte, offset int64) (int, error) {
|
|||
reverse(data[:i])
|
||||
return i, err
|
||||
}
|
||||
|
||||
// rdr : 0 1 2|3 4 5 6|7 8 9 10
|
||||
// rsr 6,4: 3 2 1 0
|
||||
// 6
|
||||
// ------- -4
|
||||
// 0 1 2 3
|
||||
// offset - size
|
||||
// rdr : 0 1 2|3 4 5 6|7 8 9 10
|
||||
// 0 1 2 3
|
||||
// offset=0 |-------| d[:4], o=3 3-0=3
|
||||
// offset=1 _|----- | d[:3], o=3 3-1=2
|
||||
// offset=2 ___|--- | d[:2], o=3 3-2=1
|
||||
// offset=3 _____|- | d[:1], o=3 3-3=0
|
||||
// offset=4+_____| | d[:0], o=3 3-4=0
|
||||
|
||||
// rdr : 0 1 2|3 4 5 6|7 8 9 10
|
||||
// offset=0 |-------| d[:4], o=0 -> 3
|
||||
// offset=0 | -----| d[:3], o=1 -> 4
|
||||
// offset=0 | ---| d[:2], o=2 -> 5
|
||||
// offset=0 | -| d[:1], o=3 -> 6
|
||||
// offset=0 | | d[:0], o=4+-> 7
|
||||
|
||||
// rdr : 0 1 2|3 4 5 6|7 8 9 10
|
||||
// offset=4 ___| | d[:0], o=0
|
||||
// offset=3 _|- | d[:1], o=0
|
||||
// offset=2 |--- | d[:2], o=0
|
||||
// offset=1 | --- | d[:2], o=1
|
||||
// offset=0 | ---| d[:2], o=2
|
||||
// offset=-1 | -|_ d[:2], o=3
|
||||
// offset=-2 | |___ d[:2], o=4+
|
||||
|
||||
// o = max(0, offset - len)
|
||||
// d =
|
||||
|
|
|
|||
168
lsm2/sst_test.go
168
lsm2/sst_test.go
|
|
@ -4,14 +4,38 @@ import (
|
|||
"bytes"
|
||||
"encoding/base64"
|
||||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
"iter"
|
||||
"slices"
|
||||
"testing"
|
||||
|
||||
"github.com/docopt/docopt-go"
|
||||
"github.com/matryer/is"
|
||||
)
|
||||
|
||||
// TestAppend tests AppendLogFile and WriteLogFile against a set of test cases.
|
||||
//
|
||||
// Each test case contains a slice of slices of io.Readers, which are passed to
|
||||
// AppendLogFile and WriteLogFile in order. The test case also contains the
|
||||
// expected encoded output as a base64 string, as well as the expected output
|
||||
// when the file is read back using ReadLogFile.
|
||||
//
|
||||
// The test case also contains the expected output when the file is read back in
|
||||
// reverse order using ReadLogFile.Rev().
|
||||
//
|
||||
// The test cases are as follows:
|
||||
//
|
||||
// - nil reader: Passes a nil slice of io.Readers to WriteLogFile.
|
||||
// - err reader: Passes a slice of io.Readers to WriteLogFile which returns an
|
||||
// error when read.
|
||||
// - single reader: Passes a single io.Reader to WriteLogFile.
|
||||
// - multiple readers: Passes a slice of multiple io.Readers to WriteLogFile.
|
||||
// - multiple commit: Passes multiple slices of io.Readers to AppendLogFile.
|
||||
// - multiple commit 3x: Passes multiple slices of io.Readers to AppendLogFile
|
||||
// three times.
|
||||
//
|
||||
// The test uses the is package from github.com/matryer/is to check that the
|
||||
// output matches the expected output.
|
||||
func TestAppend(t *testing.T) {
|
||||
type test struct {
|
||||
name string
|
||||
|
|
@ -22,39 +46,76 @@ func TestAppend(t *testing.T) {
|
|||
}
|
||||
tests := []test{
|
||||
{
|
||||
"nil reader",
|
||||
nil,
|
||||
"U291ci5pcwAAAwACAA",
|
||||
[][]byte{},
|
||||
[][]byte{},
|
||||
name: "nil reader",
|
||||
in: nil,
|
||||
enc: "U291ci5pcwAAAwACAA",
|
||||
out: [][]byte{},
|
||||
rev: [][]byte{},
|
||||
},
|
||||
{
|
||||
"single reader",
|
||||
[][]io.Reader{
|
||||
name: "err reader",
|
||||
in: nil,
|
||||
enc: "U291ci5pcwAAAwACAA",
|
||||
out: [][]byte{},
|
||||
rev: [][]byte{},
|
||||
},
|
||||
{
|
||||
name: "single reader",
|
||||
in: [][]io.Reader{
|
||||
{
|
||||
bytes.NewBuffer([]byte{1, 2, 3, 4})}},
|
||||
"U291ci5pcwAAE756XndRZXhdAAYBAgMEAQQBAhA",
|
||||
[][]byte{{1, 2, 3, 4}},
|
||||
[][]byte{{1, 2, 3, 4}}},
|
||||
enc: "U291ci5pcwAAE756XndRZXhdAAYBAgMEAQQBAhA",
|
||||
out: [][]byte{{1, 2, 3, 4}},
|
||||
rev: [][]byte{{1, 2, 3, 4}}},
|
||||
{
|
||||
"multiple readers",
|
||||
[][]io.Reader{
|
||||
name: "multiple readers",
|
||||
in: [][]io.Reader{
|
||||
{
|
||||
bytes.NewBuffer([]byte{1, 2, 3, 4}),
|
||||
bytes.NewBuffer([]byte{5, 6, 7, 8})}},
|
||||
"U291ci5pcwAAI756XndRZXhdAAYBAgMEAQRhQyZWDDn5BQAGBQYHCAEEAgIg",
|
||||
[][]byte{{1, 2, 3, 4}, {5, 6, 7, 8}},
|
||||
[][]byte{{5, 6, 7, 8}, {1, 2, 3, 4}}},
|
||||
enc: "U291ci5pcwAAI756XndRZXhdAAYBAgMEAQRhQyZWDDn5BQAGBQYHCAEEAgIg",
|
||||
out: [][]byte{{1, 2, 3, 4}, {5, 6, 7, 8}},
|
||||
rev: [][]byte{{5, 6, 7, 8}, {1, 2, 3, 4}}},
|
||||
{
|
||||
"multiple commit",
|
||||
[][]io.Reader{
|
||||
name: "multiple commit",
|
||||
in: [][]io.Reader{
|
||||
{
|
||||
bytes.NewBuffer([]byte{1, 2, 3, 4})},
|
||||
{
|
||||
bytes.NewBuffer([]byte{5, 6, 7, 8})}},
|
||||
"U291ci5pcwAAJ756XndRZXhdAAYBAgMEAQQBAhBhQyZWDDn5BQAGBQYHCAEEEAIDIA",
|
||||
[][]byte{{1, 2, 3, 4}, {5, 6, 7, 8}},
|
||||
[][]byte{{5, 6, 7, 8}, {1, 2, 3, 4}}},
|
||||
enc: "U291ci5pcwAAJr56XndRZXhdAAYBAgMEAQQBAhBhQyZWDDn5BQAGBQYHCAEEAgIQ",
|
||||
out: [][]byte{{1, 2, 3, 4}, {5, 6, 7, 8}},
|
||||
rev: [][]byte{{5, 6, 7, 8}, {1, 2, 3, 4}}},
|
||||
{
|
||||
name: "multiple commit",
|
||||
in: [][]io.Reader{
|
||||
{
|
||||
bytes.NewBuffer([]byte{1, 2, 3, 4}),
|
||||
bytes.NewBuffer([]byte{5, 6, 7, 8})},
|
||||
{
|
||||
bytes.NewBuffer([]byte{9, 10, 11, 12})},
|
||||
},
|
||||
enc: "U291ci5pcwAANr56XndRZXhdAAYBAgMEAQRhQyZWDDn5BQAGBQYHCAEEAgIgA4Buuio8Ro0ABgkKCwwBBAMCEA",
|
||||
out: [][]byte{{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}},
|
||||
rev: [][]byte{{9, 10, 11, 12}, {5, 6, 7, 8}, {1, 2, 3, 4}}},
|
||||
{
|
||||
name: "multiple commit 3x",
|
||||
in: [][]io.Reader{
|
||||
{
|
||||
bytes.NewBuffer([]byte{1, 2, 3}),
|
||||
bytes.NewBuffer([]byte{4, 5, 6}),
|
||||
},
|
||||
{
|
||||
bytes.NewBuffer([]byte{7, 8, 9}),
|
||||
},
|
||||
{
|
||||
bytes.NewBuffer([]byte{10, 11, 12}),
|
||||
bytes.NewBuffer([]byte{13, 14, 15}),
|
||||
},
|
||||
},
|
||||
enc: "U291ci5pcwAAVNCqYhhnLPWrAAUBAgMBA7axWhhYd+HsAAUEBQYBAwICHr9ryhhdbkEZAAUHCAkBAwMCDy/UIhidCwCqAAUKCwwBA/NCwhh6wXgXAAUNDg8BAwUCHg",
|
||||
out: [][]byte{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}, {10, 11, 12}, {13, 14, 15}},
|
||||
rev: [][]byte{{13, 14, 15}, {10, 11, 12}, {7, 8, 9}, {4, 5, 6}, {1, 2, 3}}},
|
||||
}
|
||||
|
||||
for _, test := range tests {
|
||||
|
|
@ -65,17 +126,17 @@ func TestAppend(t *testing.T) {
|
|||
buffers := 0
|
||||
|
||||
if len(test.in) == 0 {
|
||||
err := WriteLogFile(buf)
|
||||
err := WriteLogFile(buf, slices.Values([]io.Reader{}))
|
||||
is.NoErr(err)
|
||||
}
|
||||
for i, in := range test.in {
|
||||
buffers += len(in)
|
||||
|
||||
if i == 0 {
|
||||
err := WriteLogFile(buf, in...)
|
||||
err := WriteLogFile(buf, slices.Values(in))
|
||||
is.NoErr(err)
|
||||
} else {
|
||||
err := AppendLogFile(buf, in...)
|
||||
err := AppendLogFile(buf, slices.Values(in))
|
||||
is.NoErr(err)
|
||||
}
|
||||
}
|
||||
|
|
@ -86,47 +147,52 @@ func TestAppend(t *testing.T) {
|
|||
is.NoErr(err)
|
||||
|
||||
i := 0
|
||||
for fp := range iterOne(files.Iter()) {
|
||||
for j, fp := range files.Iter() {
|
||||
buf, err := io.ReadAll(fp)
|
||||
is.NoErr(err)
|
||||
|
||||
is.Equal(buf, test.out[i])
|
||||
is.True(len(test.out) > int(j))
|
||||
is.Equal(buf, test.out[j])
|
||||
i++
|
||||
}
|
||||
is.NoErr(files.Err)
|
||||
is.Equal(i, buffers)
|
||||
|
||||
// i = 0
|
||||
// for fp := range iterOne(files.Rev()) {
|
||||
// buf, err := io.ReadAll(fp)
|
||||
// is.NoErr(err)
|
||||
i = 0
|
||||
for j, fp := range files.Rev() {
|
||||
buf, err := io.ReadAll(fp)
|
||||
is.NoErr(err)
|
||||
|
||||
// is.Equal(buf, test.rev[i])
|
||||
// i++
|
||||
// }
|
||||
// is.NoErr(files.Err)
|
||||
// is.Equal(i, buffers)
|
||||
is.Equal(buf, test.rev[i])
|
||||
is.Equal(buf, test.out[j])
|
||||
i++
|
||||
}
|
||||
is.NoErr(files.Err)
|
||||
is.Equal(i, buffers)
|
||||
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
// TestArgs tests that the CLI arguments are correctly parsed.
|
||||
func TestArgs(t *testing.T) {
|
||||
is := is.New(t)
|
||||
usage := `Usage: lsm2 create <archive> <files>...
|
||||
`
|
||||
opts, err := docopt.ParseArgs(usage, []string{"create", "archive", "file1", "file2"}, "1.0")
|
||||
usage := `Usage: lsm2 create <archive> <files>...`
|
||||
|
||||
arguments, err := docopt.ParseArgs(usage, []string{"create", "archive", "file1", "file2"}, "1.0")
|
||||
is.NoErr(err)
|
||||
|
||||
args := struct {
|
||||
var params struct {
|
||||
Create bool `docopt:"create"`
|
||||
Archive string `docopt:"<archive>"`
|
||||
Files []string `docopt:"<files>"`
|
||||
}{}
|
||||
err = opts.Bind(&args)
|
||||
}
|
||||
err = arguments.Bind(¶ms)
|
||||
is.NoErr(err)
|
||||
fmt.Println(args)
|
||||
|
||||
is.Equal(params.Create, true)
|
||||
is.Equal(params.Archive, "archive")
|
||||
is.Equal(params.Files, []string{"file1", "file2"})
|
||||
}
|
||||
|
||||
type buffer struct {
|
||||
|
|
@ -155,6 +221,10 @@ func (b *buffer) WriteAt(data []byte, offset int64) (written int, err error) {
|
|||
return
|
||||
}
|
||||
|
||||
// ReadAt implements io.ReaderAt. It reads data from the internal buffer starting
|
||||
// from the specified offset and writes it into the provided data slice. If the
|
||||
// offset is negative, it returns an error. If the requested read extends beyond
|
||||
// the buffer's length, it returns the data read so far along with an io.EOF error.
|
||||
func (b *buffer) ReadAt(data []byte, offset int64) (int, error) {
|
||||
if offset < 0 {
|
||||
return 0, errors.New("negative offset")
|
||||
|
|
@ -166,3 +236,17 @@ func (b *buffer) ReadAt(data []byte, offset int64) (int, error) {
|
|||
|
||||
return copy(data, b.buf[offset:]), nil
|
||||
}
|
||||
|
||||
// IterOne takes an iterator that yields values of type T along with a value of
|
||||
// type I, and returns an iterator that yields only the values of type T. It
|
||||
// discards the values of type I.
|
||||
func IterOne[I, T any](it iter.Seq2[I, T]) iter.Seq[T] {
|
||||
return func(yield func(T) bool) {
|
||||
for i, v := range it {
|
||||
_ = i
|
||||
if !yield(v) {
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user