path: root/cmd/swarm/db.go

// Copyright 2017 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.

package main

import (
    "fmt"
    "io"
    "os"
    "path/filepath"

    "github.com/ethereum/go-ethereum/cmd/utils"
    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/log"
    "github.com/ethereum/go-ethereum/swarm/storage"
    "gopkg.in/urfave/cli.v1"
)

var dbCommand = cli.Command{
    Name:               "db",
    CustomHelpTemplate: helpTemplate,
    Usage:              "manage the local chunk database",
    ArgsUsage:          "db COMMAND",
    Description:        "Manage the local chunk database",
    Subcommands: []cli.Command{
        {
            Action:             dbExport,
            CustomHelpTemplate: helpTemplate,
            Name:               "export",
            Usage:              "export a local chunk database as a tar archive (use - to send to stdout)",
            ArgsUsage:          "<chunkdb> <file>",
            Description: `
Export a local chunk database as a tar archive (use - to send to stdout).

    swarm db export ~/.ethereum/swarm/bzz-KEY/chunks chunks.tar

The export may be quite large, consider piping the output through the Unix
pv(1) tool to get a progress bar:

    swarm db export ~/.ethereum/swarm/bzz-KEY/chunks - | pv > chunks.tar
`,
        },
        {
            Action:             dbImport,
            CustomHelpTemplate: helpTemplate,
            Name:               "import",
            Usage:              "import chunks from a tar archive into a local chunk database (use - to read from stdin)",
            ArgsUsage:          "<chunkdb> <file>",
            Description: `Import chunks from a tar archive into a local chunk database (use - to read from stdin).

    swarm db import ~/.ethereum/swarm/bzz-KEY/chunks chunks.tar

The import may be quite large, consider piping the input through the Unix
pv(1) tool to get a progress bar:

    pv chunks.tar | swarm db import ~/.ethereum/swarm/bzz-KEY/chunks -`,
        },
    },
}

func dbExport(ctx *cli.Context) {
    args := ctx.Args()
    if len(args) != 3 {
        utils.Fatalf("invalid arguments, please specify both <chunkdb> (path to a local chunk database), <file> (path to write the tar archive to, - for stdout) and the base key")
    }

    store, err := openLDBStore(args[0], common.Hex2Bytes(args[2]))
    if err != nil {
        utils.Fatalf("error opening local chunk database: %s", err)
    }
    defer store.Close()

    var out io.Writer
    if args[1] == "-" {
        out = os.Stdout
    } else {
        f, err := os.Create(args[1])
        if err != nil {
            utils.Fatalf("error opening output file: %s", err)
        }
        defer f.Close()
        out = f
    }

    count, err := store.Export(out)
    if err != nil {
        utils.Fatalf("error exporting local chunk database: %s", err)
    }

    log.Info(fmt.Sprintf("successfully exported %d chunks", count))
}

func dbImport(ctx *cli.Context) {
    args := ctx.Args()
    if len(args) != 3 {
        utils.Fatalf("invalid arguments, please specify both <chunkdb> (path to a local chunk database), <file> (path to read the tar archive from, - for stdin) and the base key")
    }

    store, err := openLDBStore(args[0], common.Hex2Bytes(args[2]))
    if err != nil {
        utils.Fatalf("error opening local chunk database: %s", err)
    }
    defer store.Close()

    var in io.Reader
    if args[1] == "-" {
        in = os.Stdin
    } else {
        f, err := os.Open(args[1])
        if err != nil {
            utils.Fatalf("error opening input file: %s", err)
        }
        defer f.Close()
        in = f
    }

    count, err := store.Import(in)
    if err != nil {
        utils.Fatalf("error importing local chunk database: %s", err)
    }

    log.Info(fmt.Sprintf("successfully imported %d chunks", count))
}

func openLDBStore(path string, basekey []byte) (*storage.LDBStore, error) {
    if _, err := os.Stat(filepath.Join(path, "CURRENT")); err != nil {
        return nil, fmt.Errorf("invalid chunkdb path: %s", err)
    }

    storeparams := storage.NewDefaultStoreParams()
    ldbparams := storage.NewLDBStoreParams(storeparams, path)
    ldbparams.BaseKey = basekey
    return storage.NewLDBStore(ldbparams)
}