forked from FeatureBaseDB/featurebase
/
inspect.go
105 lines (91 loc) · 2.63 KB
/
inspect.go
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// Copyright 2017 Pilosa Corp.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ctl
import (
"context"
"fmt"
"io"
"os"
"syscall"
"text/tabwriter"
"time"
"unsafe"
"github.com/pilosa/pilosa"
"github.com/pilosa/pilosa/roaring"
)
// InspectCommand represents a command for inspecting fragment data files.
type InspectCommand struct {
// Path to data file
Path string
// Standard input/output
*pilosa.CmdIO
}
// NewInspectCommand returns a new instance of InspectCommand.
func NewInspectCommand(stdin io.Reader, stdout, stderr io.Writer) *InspectCommand {
return &InspectCommand{
CmdIO: pilosa.NewCmdIO(stdin, stdout, stderr),
}
}
// Run executes the inspect command.
func (cmd *InspectCommand) Run(ctx context.Context) error {
// Open file handle.
f, err := os.Open(cmd.Path)
if err != nil {
return err
}
defer f.Close()
fi, err := f.Stat()
if err != nil {
return err
}
// Memory map the file.
data, err := syscall.Mmap(int(f.Fd()), 0, int(fi.Size()), syscall.PROT_READ, syscall.MAP_SHARED)
if err != nil {
return err
}
defer syscall.Munmap(data)
// Attach the mmap file to the bitmap.
t := time.Now()
fmt.Fprintf(cmd.Stderr, "unmarshaling bitmap...")
bm := roaring.NewBitmap()
if err := bm.UnmarshalBinary(data); err != nil {
return err
}
fmt.Fprintf(cmd.Stderr, " (%s)\n", time.Since(t))
// Retrieve stats.
t = time.Now()
fmt.Fprintf(cmd.Stderr, "calculating stats...")
info := bm.Info()
fmt.Fprintf(cmd.Stderr, " (%s)\n", time.Since(t))
// Print top-level info.
fmt.Fprintf(cmd.Stdout, "== Bitmap Info ==\n")
fmt.Fprintf(cmd.Stdout, "Containers: %d\n", len(info.Containers))
fmt.Fprintf(cmd.Stdout, "Operations: %d\n", info.OpN)
fmt.Fprintln(cmd.Stdout, "")
// Print info for each container.
fmt.Fprintln(cmd.Stdout, "== Containers ==")
tw := tabwriter.NewWriter(cmd.Stdout, 0, 8, 0, '\t', 0)
fmt.Fprintf(tw, "%s\t%s\t% 8s \t% 8s\t%s\n", "KEY", "TYPE", "N", "ALLOC", "OFFSET")
for _, ci := range info.Containers {
fmt.Fprintf(tw, "%d\t%s\t% 8d \t% 8d \t0x%08x\n",
ci.Key,
ci.Type,
ci.N,
ci.Alloc,
uintptr(ci.Pointer)-uintptr(unsafe.Pointer(&data[0])),
)
}
tw.Flush()
return nil
}