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block.go
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block.go
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package commands
import (
"bytes"
"errors"
"fmt"
"io"
"io/ioutil"
"strings"
mh "github.com/jbenet/go-ipfs/Godeps/_workspace/src/github.com/jbenet/go-multihash"
"github.com/jbenet/go-ipfs/Godeps/_workspace/src/golang.org/x/net/context"
"github.com/jbenet/go-ipfs/blocks"
cmds "github.com/jbenet/go-ipfs/commands"
u "github.com/jbenet/go-ipfs/util"
)
type BlockStat struct {
Key string
Size int
}
func (bs BlockStat) String() string {
return fmt.Sprintf("Key: %s\nSize: %d\n", bs.Key, bs.Size)
}
var BlockCmd = &cmds.Command{
Helptext: cmds.HelpText{
Tagline: "Manipulate raw IPFS blocks",
ShortDescription: `
'ipfs block' is a plumbing command used to manipulate raw ipfs blocks.
Reads from stdin or writes to stdout, and <key> is a base58 encoded
multihash.
`,
},
Subcommands: map[string]*cmds.Command{
"stat": blockStatCmd,
"get": blockGetCmd,
"put": blockPutCmd,
},
}
var blockStatCmd = &cmds.Command{
Helptext: cmds.HelpText{
Tagline: "Print information of a raw IPFS block",
ShortDescription: `
'ipfs block stat' is a plumbing command for retreiving information
on raw ipfs blocks. It outputs the following to stdout:
Key - the base58 encoded multihash
Size - the size of the block in bytes
`,
},
Arguments: []cmds.Argument{
cmds.StringArg("key", true, false, "The base58 multihash of an existing block to get").EnableStdin(),
},
Run: func(req cmds.Request, res cmds.Response) {
b, err := getBlockForKey(req, req.Arguments()[0])
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
res.SetOutput(&BlockStat{
Key: b.Key().Pretty(),
Size: len(b.Data),
})
},
Type: BlockStat{},
Marshalers: cmds.MarshalerMap{
cmds.Text: func(res cmds.Response) (io.Reader, error) {
bs := res.Output().(*BlockStat)
return strings.NewReader(bs.String()), nil
},
},
}
var blockGetCmd = &cmds.Command{
Helptext: cmds.HelpText{
Tagline: "Get a raw IPFS block",
ShortDescription: `
'ipfs block get' is a plumbing command for retreiving raw ipfs blocks.
It outputs to stdout, and <key> is a base58 encoded multihash.
`,
},
Arguments: []cmds.Argument{
cmds.StringArg("key", true, false, "The base58 multihash of an existing block to get").EnableStdin(),
},
Run: func(req cmds.Request, res cmds.Response) {
b, err := getBlockForKey(req, req.Arguments()[0])
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
res.SetOutput(bytes.NewReader(b.Data))
},
}
var blockPutCmd = &cmds.Command{
Helptext: cmds.HelpText{
Tagline: "Stores input as an IPFS block",
ShortDescription: `
ipfs block put is a plumbing command for storing raw ipfs blocks.
It reads from stdin, and <key> is a base58 encoded multihash.
`,
},
Arguments: []cmds.Argument{
cmds.FileArg("data", true, false, "The data to be stored as an IPFS block").EnableStdin(),
},
Run: func(req cmds.Request, res cmds.Response) {
n, err := req.Context().GetNode()
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
file, err := req.Files().NextFile()
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
data, err := ioutil.ReadAll(file)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
err = file.Close()
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
b := blocks.NewBlock(data)
log.Debugf("BlockPut key: '%q'", b.Key())
k, err := n.Blocks.AddBlock(b)
if err != nil {
res.SetError(err, cmds.ErrNormal)
return
}
res.SetOutput(&BlockStat{
Key: k.String(),
Size: len(data),
})
},
Marshalers: cmds.MarshalerMap{
cmds.Text: func(res cmds.Response) (io.Reader, error) {
bs := res.Output().(*BlockStat)
return strings.NewReader(bs.Key + "\n"), nil
},
},
Type: BlockStat{},
}
func getBlockForKey(req cmds.Request, key string) (*blocks.Block, error) {
n, err := req.Context().GetNode()
if err != nil {
return nil, err
}
if !u.IsValidHash(key) {
return nil, errors.New("Not a valid hash")
}
h, err := mh.FromB58String(key)
if err != nil {
return nil, err
}
k := u.Key(h)
b, err := n.Blocks.GetBlock(context.TODO(), k)
if err != nil {
return nil, err
}
log.Debugf("ipfs block: got block with key: %q", b.Key())
return b, nil
}