Exemplo n.º 1
0
Arquivo: rcf.go Projeto: reusee/rcf
func (f *File) Iter(cols []string, cb func(columns ...interface{}) bool) error {
	f.Sync()
	file, err := os.Open(f.path)
	if err != nil {
		return makeErr(err, "open file")
	}
	defer file.Close()

	// determine which set to decode and which column to collect
	toCollect := make([][]bool, 0)
	for _, set := range f.colSets {
		c := []bool{}
		for _, col := range set {
			in := false
			for _, column := range cols {
				if column == col {
					in = true
					break
				}
			}
			c = append(c, in)
		}
		toCollect = append(toCollect, c)
	}
	toDecode := make([]bool, len(toCollect))
	for n, c := range toCollect {
		for _, b := range c {
			if b {
				toDecode[n] = true
				break
			}
		}
	}

	line := pipeline.NewPipeline()
	p1 := line.NewPipe(30000)
	p2 := line.NewPipe(2048)

	// read bytes
	go func() {
		for {
			// read number of sets
			var numSets uint8
			err := binary.Read(file, binary.LittleEndian, &numSets)
			if err == io.EOF { // no more
				break
			}
			if err != nil {
				line.Error(makeErr(err, "read number of column sets"))
				return
			}
			// read meta length
			var metaLength uint32
			err = binary.Read(file, binary.LittleEndian, &metaLength)
			if err != nil {
				line.Error(makeErr(err, "read meta length"))
				return
			}
			// read sets length
			var lens []uint32
			var l uint32
			for i, max := 0, int(numSets); i < max; i++ {
				err = binary.Read(file, binary.LittleEndian, &l)
				if err != nil {
					line.Error(makeErr(err, "read column set length"))
					return
				}
				lens = append(lens, l)
			}
			// skip meta
			_, err = file.Seek(int64(metaLength), os.SEEK_CUR)
			if err != nil {
				line.Error(makeErr(err, "skip meta"))
				return
			}
			// read bytes
			var bss [][]byte
			for n, l := range lens {
				if toDecode[n] { // decode
					bs := make([]byte, l)
					_, err = io.ReadFull(file, bs)
					if err != nil {
						line.Error(makeErr(err, "read column set"))
						return
					}
					bss = append(bss, bs)
				} else { // skip
					_, err = file.Seek(int64(l), os.SEEK_CUR)
					if err != nil {
						line.Error(makeErr(err, "skip column set"))
						return
					}
					bss = append(bss, nil)
				}
			}

			line.Add()
			if !p1.Do(func() {
				var columns []interface{}
				for n, bs := range bss {
					if bs == nil {
						continue
					}
					s := f.colSetsFn(n)
					err := f.decode(bs, &s)
					if err != nil {
						line.Error(makeErr(err, "decode column set"))
						return
					}
					sValue := reflect.ValueOf(s).Elem()
					for nfield, b := range toCollect[n] {
						if b {
							columns = append(columns, sValue.Field(nfield).Interface())
						}
					}
				}

				if !p2.Do(func() {
					if !cb(columns...) {
						line.Close()
						return
					}
					line.Done()
				}) {
					return
				}

			}) {
				return
			}

		}
		line.Wait()
		line.Close()
	}()

	go p1.ParallelProcess(runtime.NumCPU())
	p2.Process()

	return line.Err
}
Exemplo n.º 2
0
Arquivo: rcf.go Projeto: reusee/rcf
func (f *File) IterAll(metaTarget interface{}, columnsTarget interface{}, cb func() bool) error {
	f.Sync()
	file, err := os.Open(f.path)
	if err != nil {
		return makeErr(err, "open file")
	}
	defer file.Close()

	columnsToCollect := make(map[string]bool)
	t := reflect.TypeOf(columnsTarget).Elem()
	for i, l := 0, t.NumField(); i < l; i++ {
		columnsToCollect[t.Field(i).Name] = true
	}

	toDecode := make([]bool, len(f.colSets))
	for i, set := range f.colSets {
		for _, col := range set {
			if columnsToCollect[col] {
				toDecode[i] = true
			}
		}
	}

	line := pipeline.NewPipeline()
	p1 := line.NewPipe(30000)
	p2 := line.NewPipe(2048)

	columnsTargetValue := reflect.ValueOf(columnsTarget).Elem()

	go func() {
		for {

			// read number of sets
			var numSets uint8
			err := binary.Read(file, binary.LittleEndian, &numSets)
			if err == io.EOF { // no more
				break
			}
			if err != nil {
				line.Error(makeErr(err, "read number of column sets"))
				return
			}

			// read meta length
			var metaLength uint32
			err = binary.Read(file, binary.LittleEndian, &metaLength)
			if err != nil {
				line.Error(makeErr(err, "read meta length"))
				return
			}

			// read sets length
			var lens []uint32
			var l uint32
			for i, max := 0, int(numSets); i < max; i++ {
				err = binary.Read(file, binary.LittleEndian, &l)
				if err != nil {
					line.Error(makeErr(err, "read column set length"))
					return
				}
				lens = append(lens, l)
			}

			// read meta
			metaBytes := make([]byte, metaLength)
			_, err = io.ReadFull(file, metaBytes)
			if err != nil {
				line.Error(makeErr(err, "read meta"))
				return
			}

			// read bytes
			var columnBytesSlice [][]byte
			for n, l := range lens {
				if len(lens) != len(toDecode) {
					panic(fmt.Sprintf("lens %d toDecode %d numSets %d\n", len(lens), len(toDecode), numSets))
				}
				if toDecode[n] { // decode
					bs := make([]byte, l)
					_, err = io.ReadFull(file, bs)
					if err != nil {
						line.Error(makeErr(err, "read column set"))
						return
					}
					columnBytesSlice = append(columnBytesSlice, bs)
				} else { // skip
					_, err = file.Seek(int64(l), os.SEEK_CUR)
					if err != nil {
						line.Error(makeErr(err, "skip column set"))
						return
					}
					columnBytesSlice = append(columnBytesSlice, nil)
				}
			}

			line.Add()
			if !p1.Do(func() {
				// decode meta
				meta := reflect.New(reflect.TypeOf(metaTarget).Elem())
				err = f.decode(metaBytes, meta.Interface())
				if err != nil {
					line.Error(makeErr(err, "decode meta"))
					return
				}

				// decode columns
				toSet := make(map[string]reflect.Value)
				for n, bs := range columnBytesSlice {
					if bs == nil {
						continue
					}
					columnSet := f.colSetsFn(n)
					err := f.decode(bs, &columnSet)
					if err != nil {
						line.Error(makeErr(err, "decode column set"))
						return
					}
					columnSetType := reflect.TypeOf(columnSet).Elem()
					columnSetValue := reflect.ValueOf(columnSet).Elem()
					for i, l := 0, columnSetType.NumField(); i < l; i++ {
						name := columnSetType.Field(i).Name
						if columnsToCollect[name] {
							toSet[name] = columnSetValue.FieldByName(name)
						}
					}
				}

				if !p2.Do(func() {
					// assign
					reflect.ValueOf(metaTarget).Elem().Set(meta.Elem())
					for name, value := range toSet {
						columnsTargetValue.FieldByName(name).Set(value)
					}
					// callback
					if !cb() {
						line.Close()
						return
					}
					//pt("%d %d\n", p1.Len(), p2.Len())
					line.Done()
				}) {
					return
				}

			}) {
				return
			}

		}
		line.Wait()
		line.Close()
	}()

	go p1.ParallelProcess(runtime.NumCPU())
	p2.Process()

	return line.Err
}
Exemplo n.º 3
0
Arquivo: rcf.go Projeto: reusee/rcf
func (f *File) IterMetas(fn interface{}) error {
	f.Sync()
	file, err := os.Open(f.path)
	if err != nil {
		return makeErr(err, "open file")
	}
	defer file.Close()

	fnValue := reflect.ValueOf(fn)
	fnType := fnValue.Type()
	metaType := fnType.In(0)

	line := pipeline.NewPipeline()
	p1 := line.NewPipe(100000)
	p2 := line.NewPipe(2048)

	go func() {
		for {
			meta := reflect.New(metaType)

			// read number of sets
			var numSets uint8
			err = binary.Read(file, binary.LittleEndian, &numSets)
			if err == io.EOF { // no more
				break
			}
			if err != nil {
				line.Error(makeErr(err, "read number of column sets"))
				return
			}

			// read meta length
			var metaLength uint32
			err = binary.Read(file, binary.LittleEndian, &metaLength)
			if err != nil {
				line.Error(makeErr(err, "read meta length"))
				return
			}

			// read sets length
			var sum, l uint32
			for i, max := 0, int(numSets); i < max; i++ {
				err = binary.Read(file, binary.LittleEndian, &l)
				if err != nil {
					line.Error(makeErr(err, "read column set length"))
					return
				}
				sum += l
			}

			// read meta
			bs := make([]byte, metaLength)
			_, err = io.ReadFull(file, bs)
			if err != nil {
				line.Error(makeErr(err, "read meta"))
				return
			}
			line.Add()

			if !p1.Do(func() {
				// decode meta
				err = f.decode(bs, meta.Interface())
				if err != nil {
					line.Error(makeErr(err, "decode meta"))
					return
				}
				// callback
				if !p2.Do(func() {
					if !fnValue.Call([]reflect.Value{meta.Elem()})[0].Bool() {
						line.Close()
						return
					}
					line.Done()
				}) {
					return
				}
			}) {
				return
			}

			// skip sets
			_, err = file.Seek(int64(sum), os.SEEK_CUR)
			if err != nil {
				line.Error(makeErr(err, "skip column sets"))
				return
			}

		}
		line.Wait()
		line.Close()
	}()

	go p1.ParallelProcess(runtime.NumCPU())
	p2.Process()

	return line.Err
}