Golang fsrepo.Open函數代碼示例

func startupIPFS(dspath string, ctx *context.Context) (*core.IpfsNode, error) {
	r, err := fsrepo.Open(dspath)
	if err != nil {
		config, err := config.Init(os.Stdout, 2048)
		if err != nil {
			return nil, err
		}

		if err := fsrepo.Init(dspath, config); err != nil {
			return nil, err
		}

		r, err = fsrepo.Open(dspath)
		if err != nil {
			return nil, err
		}
	}

	//fmt.Println(r)
	node, err := core.NewNode(*ctx, &core.BuildCfg{Online: true, Repo: r})
	if err != nil {
		return nil, err
	}

	return node, nil

}

func createNode(nd *Node, online bool, ctx context.Context) (*core.IpfsNode, error) {
	// `nd` only contains the prepopulated fields as in New().
	rp, err := fsrepo.Open(nd.Path)
	if err != nil {
		log.Errorf("Unable to open repo `%s`: %v", nd.Path, err)
		return nil, err
	}

	swarmAddrs := []string{
		fmt.Sprintf("/ip4/0.0.0.0/tcp/%d", nd.SwarmPort),
		fmt.Sprintf("/ip6/::/tcp/%d", nd.SwarmPort),
	}

	if err := rp.SetConfigKey("Addresses.Swarm", swarmAddrs); err != nil {
		return nil, err
	}

	cfg := &core.BuildCfg{
		Repo:   rp,
		Online: online,
	}

	ipfsNode, err := core.NewNode(ctx, cfg)
	if err != nil {
		return nil, err
	}

	return ipfsNode, nil
}

func NewTmpDirNode(ctx context.Context) (*core.IpfsNode, error) {
	dir, err := ioutil.TempDir("", "ipfs-shell")
	if err != nil {
		return nil, fmt.Errorf("failed to get temp dir: %s", err)
	}

	cfg, err := config.Init(ioutil.Discard, 1024)
	if err != nil {
		return nil, err
	}

	err = fsrepo.Init(dir, cfg)
	if err != nil {
		return nil, fmt.Errorf("failed to init ephemeral node: %s", err)
	}

	repo, err := fsrepo.Open(dir)
	if err != nil {
		return nil, err
	}

	return core.NewNode(ctx, &core.BuildCfg{
		Online: true,
		Repo:   repo,
	})
}

func BuildNode(ctx context.Context, dcConfig *DCConfig) (*core.IpfsNode, error) {
	// Get a IPFS repo/config directory, and open it
	ipfsPath, err := getIpfsPath(dcConfig.PoolIndex)
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	repo, err := fsrepo.Open(ipfsPath)
	if err != nil {
		return nil, err
	}

	// Create the node with a config
	node, err := core.NewNode(ctx, &core.BuildCfg{
		Online: true,
		Repo:   repo,
	})

	if err != nil {
		return nil, err
	}

	return node, nil
}

func (i *cmdInvocation) constructNodeFunc(ctx context.Context) func() (*core.IpfsNode, error) {
	return func() (*core.IpfsNode, error) {
		if i.req == nil {
			return nil, errors.New("constructing node without a request")
		}

		cmdctx := i.req.InvocContext()
		if cmdctx == nil {
			return nil, errors.New("constructing node without a request context")
		}

		r, err := fsrepo.Open(i.req.InvocContext().ConfigRoot)
		if err != nil { // repo is owned by the node
			return nil, err
		}

		// ok everything is good. set it on the invocation (for ownership)
		// and return it.
		n, err := core.NewNode(ctx, &core.BuildCfg{
			Online: cmdctx.Online,
			Repo:   r,
		})
		if err != nil {
			return nil, err
		}
		i.node = n
		return i.node, nil
	}
}

func addDefaultAssets(out io.Writer, repoRoot string) error {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	r, err := fsrepo.Open(repoRoot)
	if err != nil { // NB: repo is owned by the node
		return err
	}

	nd, err := core.NewNode(ctx, &core.BuildCfg{Repo: r})
	if err != nil {
		return err
	}
	defer nd.Close()

	dkey, err := assets.SeedInitDocs(nd)
	if err != nil {
		return fmt.Errorf("init: seeding init docs failed: %s", err)
	}
	log.Debugf("init: seeded init docs %s", dkey)

	if _, err = fmt.Fprintf(out, "to get started, enter:\n"); err != nil {
		return err
	}

	_, err = fmt.Fprintf(out, "\n\tipfs cat /ipfs/%s/readme\n\n", dkey)
	return err
}

// TODO share func
func writeConfig(path string, cfg *config.Config) error {
	// NB: This needs to run on the daemon.
	r, err := fsrepo.Open(path)
	if err != nil {
		return err
	}
	defer r.Close()
	return r.SetConfig(cfg)
}

func addDefaultAssets(out io.Writer, repoRoot string) error {
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	r, err := fsrepo.Open(repoRoot)
	if err != nil { // NB: repo is owned by the node
		return err
	}

	nd, err := core.NewIPFSNode(ctx, core.Offline(r))
	if err != nil {
		return err
	}
	defer nd.Close()

	dirb := uio.NewDirectory(nd.DAG)

	// add every file in the assets pkg
	for fname, file := range assets.Init_dir {
		buf := bytes.NewBufferString(file)
		s, err := coreunix.Add(nd, buf)
		if err != nil {
			return err
		}

		k := key.B58KeyDecode(s)
		if err := dirb.AddChild(fname, k); err != nil {
			return err
		}
	}

	dir := dirb.GetNode()
	dkey, err := nd.DAG.Add(dir)
	if err != nil {
		return err
	}

	if err := nd.Pinning.Pin(ctx, dir, true); err != nil {
		return err
	}

	if err := nd.Pinning.Flush(); err != nil {
		return err
	}

	if _, err = fmt.Fprintf(out, "to get started, enter:\n"); err != nil {
		return err
	}

	_, err = fmt.Fprintf(out, "\n\tipfs cat /ipfs/%s/readme\n\n", dkey)
	return err
}

//NewSelf make repo if needed ,starts daemon and returns Self obj.
func NewSelf(cfg *config.Config, rootPath string) *Self {
	InitRepo(cfg.IpfsRepo)
	n := &merkledag.Node{}
	k, err := n.Key()
	log.IfFatal(err)
	//workaround "ERROR    bitswap: failed to find any peer in table"
	i := 0
	var node *core.IpfsNode
	var ctx context.Context
	var cancel context.CancelFunc
	for i = 0; i < 10; i++ {
		log.Println("setting up node...")
		r, err := fsrepo.Open(cfg.IpfsRepo)
		log.IfFatal(err)
		ctx, cancel = context.WithCancel(context.Background())
		node, err = core.NewNode(ctx, &core.BuildCfg{
			Repo:   r,
			Online: true,
		})
		log.IfFatal(err)
		if err := node.Routing.Provide(ctx, k); log.If(err) {
			cancel()
			log.If(node.Close())
			log.Println("retrying...")
			continue
		}
		break
	}
	if i == 10 {
		log.Fatal("cannot provide a key to network")
	}
	self := &Self{
		RootPath: rootPath,
		ipfsNode: node,
		ctx:      ctx,
		cancel:   cancel,
		cfg:      cfg,
	}
	self.follow = FromStringSlice(cfg.FollowPeers, self)
	parent, err := self.ToPeer().GetDAGNode("")
	if log.If(err) {
		parent = &merkledag.Node{}
	}
	self.myIpns, err = parent.Key()
	log.IfFatal(err)
	if _, err = parent.GetNodeLink(rootPath); err != nil {
		log.Println("initializing DAGs for saving status")
		self.makeInitNodes(parent)
	}
	return self
}

func SetupIpfs() (*core.IpfsNode, error) {
	// Assume the user has run 'ipfs init'
	r, err := fsrepo.Open("~/.ipfs")
	if err != nil {
		return nil, err
	}

	cfg := &core.BuildCfg{
		Repo:   r,
		Online: true,
	}

	return core.NewNode(context.Background(), cfg)
}

func main() {
	bsize := kingpin.Flag("blocksize", "blocksize to test with").Default("262144").Int64()
	kingpin.Parse()

	ipfsdir := getIpfsDir()
	r, err := fsrepo.Open(ipfsdir)
	if err != nil {
		fmt.Printf("Failed to open ipfs repo at: %s: %s\n", ipfsdir, err)
		fmt.Println("Please ensure ipfs has been initialized and that no daemon is running")
		return
	}

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	nd, err := core.NewNode(ctx, &core.BuildCfg{
		Repo: r,
	})
	if err != nil {
		fmt.Printf("failed to create node: %s\n", err)
		return
	}

	cfg := &BenchCfg{
		Blocksize: *bsize,
	}

	fmt.Println(cfg)
	err = BenchmarkBlockRewrites(nd, cfg)
	if err != nil {
		panic(err)
	}

	err = BenchmarkRandomBlockWrites(nd, cfg)
	if err != nil {
		panic(err)
	}

	err = BenchmarkAdd(nd, cfg)
	if err != nil {
		panic(err)
	}

	err = BenchmarkDiskWrites(ipfsdir)
	if err != nil {
		panic(err)
	}
}

// create a new Service
func NewService(name string, location string) (Service, error) {
	// Basic ipfsnode setup
	repo, err := fsrepo.Open(location)
	if err != nil {
		return Service{}, err
	}
	nodeBuilder := core.NewNodeBuilder().Online()
	nodeBuilder.SetRepo(repo)

	ctx, cancel := context.WithCancel(context.Background())

	node, err := nodeBuilder.Build(ctx)
	if err != nil {
		return Service{}, err
	}
	return Service{name, node, cancel, ctx, nil, make(chan bool), false}, nil
}

func NewDefaultNodeWithFSRepo(ctx context.Context, repoPath string) (*core.IpfsNode, error) {
	r, err := fsrepo.Open(repoPath)
	if err != nil {
		return nil, errgo.Notef(err, "opening fsrepo failed")
	}
	node, err := core.NewNode(ctx, &core.BuildCfg{
		Online: true,
		Repo:   r,
	})
	if err != nil {
		return nil, errgo.Notef(err, "ipfs NewNode() failed.")
	}
	// TODO: can we bootsrap localy/mdns first and fall back to default?
	err = node.Bootstrap(core.DefaultBootstrapConfig)
	if err != nil {
		return nil, errgo.Notef(err, "ipfs Bootstrap() failed.")
	}
	return node, nil
}

func main() {
	bkp, err := fsrepo.BestKnownPath()
	if err != nil {
		panic(err)
	}

	r, err := fsrepo.Open(bkp)
	if err != nil {
		panic(err)
	}

	k := ds.NewKey(os.Args[1])

	val, err := r.Datastore().Get(k)
	if err != nil {
		fmt.Fprintln(os.Stderr, err)
		os.Exit(1)
	}

	fmt.Println(string(val.([]byte)))
}

func main() {
	if len(os.Args) < 2 {
		fmt.Println("Please give a peer ID as an argument")
		return
	}
	target, err := peer.IDB58Decode(os.Args[1])
	if err != nil {
		panic(err)
	}

	// Basic ipfsnode setup
	r, err := fsrepo.Open("~/.ipfs")
	if err != nil {
		panic(err)
	}

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	cfg := &core.BuildCfg{
		Repo:   r,
		Online: true,
	}

	nd, err := core.NewNode(ctx, cfg)

	if err != nil {
		panic(err)
	}

	fmt.Printf("I am peer %s dialing %s\n", nd.Identity, target)

	con, err := corenet.Dial(nd, target, "/app/whyrusleeping")
	if err != nil {
		fmt.Println(err)
		return
	}

	io.Copy(os.Stdout, con)
}