chore(lsm): cleanup and add tools
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This commit is contained in:
xuu
2024-11-09 09:32:29 -07:00
parent cf99e18a39
commit dfae0ddbcc
10 changed files with 1106 additions and 1749 deletions

286
lsm/cli/main.go Normal file
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@@ -0,0 +1,286 @@
package main
import (
"bytes"
"context"
"encoding/base64"
"errors"
"fmt"
"io"
"iter"
"net/http"
"net/url"
"os"
"time"
"github.com/docopt/docopt-go"
"go.sour.is/pkg/lsm"
)
var usage = `
Usage:
lsm create <archive> <files>...
lsm append <archive> <files>...
lsm read <archive> [<start> [<end>]]
lsm serve <archive>
lsm client <archive> [<start> [<end>]]`
type args struct {
Create bool
Append bool
Read bool
Serve bool
Client bool
Archive string `docopt:"<archive>"`
Files []string `docopt:"<files>"`
Start int64 `docopt:"<start>"`
End int64 `docopt:"<end>"`
}
func main() {
opts, err := docopt.ParseDoc(usage)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
args := args{}
err = opts.Bind(&args)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
err = run(Console, args)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
}
type console struct {
Stdin io.Reader
Stdout io.Writer
Stderr io.Writer
}
var Console = console{os.Stdin, os.Stdout, os.Stderr}
func (c console) Write(b []byte) (int, error) {
return c.Stdout.Write(b)
}
func run(console console, a args) error {
fmt.Fprintln(console, "lsm")
switch {
case a.Create:
f, err := os.OpenFile(a.Archive, os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return err
}
defer f.Close()
return lsm.WriteLogFile(f, fileReaders(a.Files))
case a.Append:
f, err := os.OpenFile(a.Archive, os.O_RDWR, 0644)
if err != nil {
return err
}
defer f.Close()
return lsm.AppendLogFile(f, fileReaders(a.Files))
case a.Read:
fmt.Fprintln(console, "reading", a.Archive)
f, err := os.Open(a.Archive)
if err != nil {
return err
}
defer f.Close()
return readContent(f, console, a.Start, a.End)
case a.Serve:
fmt.Fprintln(console, "serving", a.Archive)
b, err := base64.RawStdEncoding.DecodeString(a.Archive)
now := time.Now()
if err != nil {
return err
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
http.ServeContent(w, r, "", now, bytes.NewReader(b))
})
return http.ListenAndServe(":8080", nil)
case a.Client:
r, err := OpenHttpReader(context.Background(), a.Archive, 0)
if err != nil {
return err
}
defer r.Close()
defer func() {fmt.Println("bytes read", r.bytesRead)}()
return readContent(r, console, a.Start, a.End)
}
return errors.New("unknown command")
}
func readContent(r io.ReaderAt, console console, start, end int64) error {
lg, err := lsm.ReadLogFile(r)
if err != nil {
return err
}
for bi, rd := range lg.Iter(uint64(start)) {
if end > 0 && int64(bi.Index) >= end {
break
}
fmt.Fprintf(console, "=========================\n%+v:\n", bi)
wr := base64.NewEncoder(base64.RawStdEncoding, console)
io.Copy(wr, rd)
fmt.Fprintln(console, "\n=========================")
}
if lg.Err != nil {
return lg.Err
}
for bi, rd := range lg.Rev(lg.Count()) {
if end > 0 && int64(bi.Index) >= end {
break
}
fmt.Fprintf(console, "=========================\n%+v:\n", bi)
wr := base64.NewEncoder(base64.RawStdEncoding, console)
io.Copy(wr, rd)
fmt.Fprintln(console, "\n=========================")
}
return lg.Err
}
func fileReaders(names []string) iter.Seq[io.Reader] {
return iter.Seq[io.Reader](func(yield func(io.Reader) bool) {
for _, name := range names {
f, err := os.Open(name)
if err != nil {
continue
}
if !yield(f) {
f.Close()
return
}
f.Close()
}
})
}
type HttpReader struct {
ctx context.Context
uri url.URL
tmpfile *os.File
pos int64
end int64
bytesRead int
}
func OpenHttpReader(ctx context.Context, uri string, end int64) (*HttpReader, error) {
u, err := url.Parse(uri)
if err != nil {
return nil, err
}
return &HttpReader{ctx: ctx, uri: *u, end: end}, nil
}
func (r *HttpReader) Read(p []byte) (int, error) {
n, err := r.ReadAt(p, r.pos)
if err != nil {
return n, err
}
r.pos += int64(n)
r.bytesRead += n
return n, nil
}
func (r *HttpReader) Seek(offset int64, whence int) (int64, error) {
switch whence {
case io.SeekStart:
r.pos = offset
case io.SeekCurrent:
r.pos += offset
case io.SeekEnd:
r.pos = r.end + offset
}
return r.pos, nil
}
func (r *HttpReader) Close() error {
r.ctx.Done()
return nil
}
// 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 (r *HttpReader) ReadAt(data []byte, offset int64) (int, error) {
if err := r.ctx.Err(); err != nil {
return 0, err
}
if offset < 0 {
return 0, errors.New("negative offset")
}
if r.end > 0 && offset > r.end {
return 0, io.EOF
}
dlen := len(data) + int(offset)
if r.end > 0 && r.end+int64(dlen) > r.end {
dlen = int(r.end)
}
end := ""
if r.end > 0 {
end = fmt.Sprintf("/%d", r.end)
}
req, err := http.NewRequestWithContext(r.ctx, "GET", r.uri.String(), nil)
if err != nil {
return 0, err
}
req.Header.Set("Range", fmt.Sprintf("bytes=%d-%d%s", offset, dlen, end))
fmt.Fprintln(Console.Stderr, req)
resp, err := http.DefaultClient.Do(req)
if err != nil {
return 0, err
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusRequestedRangeNotSatisfiable {
fmt.Fprintln(Console.Stderr, "requested range not satisfiable")
return 0, io.EOF
}
if resp.StatusCode == http.StatusOK {
r.tmpfile, err = os.CreateTemp("", "httpReader")
if err != nil {
return 0, err
}
defer os.Remove(r.tmpfile.Name())
n, err := io.Copy(r.tmpfile, resp.Body)
if err != nil {
return 0, err
}
r.bytesRead += int(n)
defer fmt.Fprintln(Console.Stderr, "wrote ", n, " bytes to ", r.tmpfile.Name())
resp.Body.Close()
r.tmpfile.Seek(offset, 0)
return io.ReadFull(r.tmpfile, data)
}
n, err := io.ReadFull(resp.Body, data)
if n == 0 && err != nil {
return n, err
}
r.bytesRead += n
defer fmt.Fprintln(Console.Stderr, "read ", n, " bytes")
return n, nil
}

104
lsm/cli/main_test.go Normal file
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@@ -0,0 +1,104 @@
package main
import (
"bytes"
"os"
"testing"
)
func TestCreate(t *testing.T) {
tests := []struct {
name string
args args
wantErr bool
wantOutput string
}{
{
name: "no input files",
args: args{
Create: true,
Archive: "test.txt",
Files: []string{},
},
wantErr: false,
wantOutput: "creating test.txt from []\nwrote 0 files\n",
},
{
name: "one input file",
args: args{
Create: true,
Archive: "test.txt",
Files: []string{"test_input.txt"},
},
wantErr: false,
wantOutput: "creating test.txt from [test_input.txt]\nwrote 1 files\n",
},
{
name: "multiple input files",
args: args{
Create: true,
Archive: "test.txt",
Files: []string{"test_input1.txt", "test_input2.txt"},
},
wantErr: false,
wantOutput: "creating test.txt from [test_input1.txt test_input2.txt]\nwrote 2 files\n",
},
{
name: "non-existent input files",
args: args{
Create: true,
Archive: "test.txt",
Files: []string{"non_existent_file.txt"},
}, wantErr: false,
wantOutput: "creating test.txt from [non_existent_file.txt]\nwrote 0 files\n",
},
{
name: "invalid command",
args: args{
Create: false,
Archive: "test.txt",
Files: []string{},
},
wantErr: true,
wantOutput: "",
},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
// Create a temporary directory for the input files
tmpDir, err := os.MkdirTemp("", "lsm2-cli-test")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmpDir)
os.Chdir(tmpDir)
// Create the input files
for _, file := range tc.args.Files {
if file == "non_existent_file.txt" {
continue
}
if err := os.WriteFile(file, []byte(file), 0o644); err != nil {
t.Fatal(err)
}
}
// Create a buffer to capture the output
var output bytes.Buffer
// Call the create function
err = run(console{Stdout: &output}, tc.args)
// Check the output
if output.String() != tc.wantOutput {
t.Errorf("run() output = %q, want %q", output.String(), tc.wantOutput)
}
// Check for errors
if tc.wantErr && err == nil {
t.Errorf("run() did not return an error")
}
})
}
}