/
b+bot.go
174 lines (157 loc) · 3.89 KB
/
b+bot.go
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package main
import . "file-structures/block/byteslice"
import "file-structures/bptree"
import "os"
import "bufio"
import "fmt"
import "encoding/json"
import "encoding/binary"
import "runtime"
import "runtime/pprof"
import "io/ioutil"
type Metadata struct {
Path string
Keysize uint32
Fieldsizes []uint32
}
/*
type Command struct {
Op string
LeftKey []byte
RightKey []byte
Fields [][]byte
FileName string
}
*/
const (
insert = iota
find
quit
size
contains
)
const (
cont = iota
stop
)
func init() {
runtime.GOMAXPROCS(2)
}
func main() {
if false {
if f, err := ioutil.TempFile(".", "b+bot.profile"); err != nil {
panic(err)
} else {
pprof.StartCPUProfile(f)
defer pprof.StopCPUProfile()
}
}
// Read the string
input := bufio.NewReader(os.Stdin)
output := os.Stdout
var info = Metadata{"", uint32(0), nil}
// var cmd = Command{"", nil, nil, nil, ""}
infoJson, err := input.ReadBytes('\n')
if err != nil {
panic(err)
} else {
json.Unmarshal(infoJson, &info)
}
bpt, bperr := bptree.NewBpTree(info.Path, info.Keysize, info.Fieldsizes)
if !bperr {
panic("Failed B+ tree creation")
} else {
fmt.Println("ok")
}
to_byte_slice := func(bytes []byte) []ByteSlice {
B := make([]ByteSlice, 0, len(info.Fieldsizes))
offset := 0
for i := 0; i < len(info.Fieldsizes); i++ {
size := int(info.Fieldsizes[i])
bs := make([]byte, 0, size)
for j := offset; j < offset+size; j++ {
bs = append(bs, bytes[j])
}
B = append(B, ByteSlice(bs))
offset += size
}
return B
}
var total_field_bytes int
for i := range info.Fieldsizes {
total_field_bytes += int(info.Fieldsizes[i])
}
serveloop:
for {
var cmd_type byte
if err := binary.Read(input, binary.LittleEndian, &cmd_type); err != nil {
break
}
if cmd_type == quit {
break
} else if cmd_type == insert {
key := make([]byte, info.Keysize)
fields := make([]byte, total_field_bytes)
if err := binary.Read(input, binary.LittleEndian, &key); err != nil {
break
}
if err := binary.Read(input, binary.LittleEndian, &fields); err != nil {
break
}
/*
fmt.Fprintf(os.Stderr, "Key = '%v'\n", key)
fmt.Fprintf(os.Stderr, "Fields = '%v'\n", fields)
bfields := to_byte_slice(fields)
for i := range bfields {
fmt.Fprintf(os.Stderr, "bytesliced field (%v) = '%v'\n", i, bfields[i])
}
*/
result := bpt.Insert(key[:], to_byte_slice(fields))
fmt.Println(result)
} else if cmd_type == size {
size := ByteSlice64(bpt.Size())
output.Write(size)
} else if cmd_type == contains {
key := make([]byte, info.Keysize)
if err := binary.Read(input, binary.LittleEndian, &key); err != nil {
break
}
if bpt.Contains(key) {
output.Write(ByteSlice8(1))
} else {
output.Write(ByteSlice8(0))
}
} else if cmd_type == find {
leftkey := make([]byte, info.Keysize)
rightkey := make([]byte, info.Keysize)
if err := binary.Read(input, binary.LittleEndian, &leftkey); err != nil {
break
}
if err := binary.Read(input, binary.LittleEndian, &rightkey); err != nil {
break
}
records := bpt.Find(leftkey, rightkey)
for record := range records {
if err := binary.Write(output, binary.LittleEndian, byte(cont)); err != nil {
fmt.Fprintln(os.Stderr, err)
break serveloop
}
if _, err := output.Write(record.Bytes()); err != nil {
fmt.Fprintln(os.Stderr, err)
break serveloop
}
}
if err := binary.Write(output, binary.LittleEndian, byte(stop)); err != nil {
fmt.Fprintln(os.Stderr, err)
break serveloop
}
} else {
fmt.Fprintf(os.Stderr, "Bad command type %v\n", cmd_type)
}
}
fmt.Println("exited")
}
// Determine which file and schema is being opened
// (filename string, keysize uint32, fields []uint32)
// insert(key Byteslice, record []Byteslice)
// find(leftkey, right key) returns channel with all matching keys+records (Record structs)