Golang Request.InvocContext方法代码示例

func tourRunFunc(req cmds.Request, res cmds.Response) {

	cfg, err := req.InvocContext().GetConfig()
	if err != nil {
		res.SetError(err, cmds.ErrNormal)
		return
	}

	id := tour.TopicID(cfg.Tour.Last)
	if len(req.Arguments()) > 0 {
		id = tour.TopicID(req.Arguments()[0])
	}

	w := new(bytes.Buffer)
	t, err := tourGet(id)
	if err != nil {

		// If no topic exists for this id, we handle this error right here.
		// To help the user achieve the task, we construct a response
		// comprised of...
		// 1) a simple error message
		// 2) the full list of topics

		fmt.Fprintln(w, "ERROR")
		fmt.Fprintln(w, err)
		fmt.Fprintln(w, "")
		fprintTourList(w, tour.TopicID(cfg.Tour.Last))
		res.SetOutput(w)

		return
	}

	fprintTourShow(w, t)
	res.SetOutput(w)
}

//collects options and opens the fuse mountpoint
func mountFuse(req cmds.Request) error {
	cfg, err := req.InvocContext().GetConfig()
	if err != nil {
		return fmt.Errorf("mountFuse: GetConfig() failed: %s", err)
	}

	fsdir, found, err := req.Option(ipfsMountKwd).String()
	if err != nil {
		return fmt.Errorf("mountFuse: req.Option(%s) failed: %s", ipfsMountKwd, err)
	}
	if !found {
		fsdir = cfg.Mounts.IPFS
	}

	nsdir, found, err := req.Option(ipnsMountKwd).String()
	if err != nil {
		return fmt.Errorf("mountFuse: req.Option(%s) failed: %s", ipnsMountKwd, err)
	}
	if !found {
		nsdir = cfg.Mounts.IPNS
	}

	node, err := req.InvocContext().ConstructNode()
	if err != nil {
		return fmt.Errorf("mountFuse: ConstructNode() failed: %s", err)
	}

	err = commands.Mount(node, fsdir, nsdir)
	if err != nil {
		return err
	}
	fmt.Printf("IPFS mounted at: %s\n", fsdir)
	fmt.Printf("IPNS mounted at: %s\n", nsdir)
	return nil
}

func callCommand(ctx context.Context, req cmds.Request, root *cmds.Command, cmd *cmds.Command) (cmds.Response, error) {
	log.Info(config.EnvDir, " ", req.InvocContext().ConfigRoot)
	var res cmds.Response

	err := req.SetRootContext(ctx)
	if err != nil {
		return nil, err
	}

	details, err := commandDetails(req.Path(), root)
	if err != nil {
		return nil, err
	}

	client, err := commandShouldRunOnDaemon(*details, req, root)
	if err != nil {
		return nil, err
	}

	err = callPreCommandHooks(ctx, *details, req, root)
	if err != nil {
		return nil, err
	}

	if cmd.PreRun != nil {
		err = cmd.PreRun(req)
		if err != nil {
			return nil, err
		}
	}

	if client != nil && !cmd.External {
		log.Debug("Executing command via API")
		res, err = client.Send(req)
		if err != nil {
			if isConnRefused(err) {
				err = repo.ErrApiNotRunning
			}
			return nil, err
		}

	} else {
		log.Debug("Executing command locally")

		err := req.SetRootContext(ctx)
		if err != nil {
			return nil, err
		}

		// Okay!!!!! NOW we can call the command.
		res = root.Call(req)

	}

	if cmd.PostRun != nil {
		cmd.PostRun(req, res)
	}

	return res, nil
}

// commandShouldRunOnDaemon determines, from commmand details, whether a
// command ought to be executed on an IPFS daemon.
//
// It returns a client if the command should be executed on a daemon and nil if
// it should be executed on a client. It returns an error if the command must
// NOT be executed on either.
func commandShouldRunOnDaemon(details cmdDetails, req cmds.Request, root *cmds.Command) (cmdsHttp.Client, error) {
	path := req.Path()
	// root command.
	if len(path) < 1 {
		return nil, nil
	}

	if details.cannotRunOnClient && details.cannotRunOnDaemon {
		return nil, fmt.Errorf("command disabled: %s", path[0])
	}

	if details.doesNotUseRepo && details.canRunOnClient() {
		return nil, nil
	}

	// at this point need to know whether api is running. we defer
	// to this point so that we dont check unnecessarily

	// did user specify an api to use for this command?
	apiAddrStr, _, err := req.Option(coreCmds.ApiOption).String()
	if err != nil {
		return nil, err
	}

	client, err := getApiClient(req.InvocContext().ConfigRoot, apiAddrStr)
	if err == repo.ErrApiNotRunning {
		if apiAddrStr != "" && req.Command() != daemonCmd {
			// if user SPECIFIED an api, and this cmd is not daemon
			// we MUST use it. so error out.
			return nil, err
		}

		// ok for api not to be running
	} else if err != nil { // some other api error
		return nil, err
	}

	if client != nil { // daemon is running
		if details.cannotRunOnDaemon {
			e := "cannot use API with this command."

			// check if daemon locked. legacy error text, for now.
			daemonLocked, _ := fsrepo.LockedByOtherProcess(req.InvocContext().ConfigRoot)
			if daemonLocked {
				e = "ipfs daemon is running. please stop it to run this command"
			}

			return nil, cmds.ClientError(e)
		}

		return client, nil
	}

	if details.cannotRunOnClient {
		return nil, cmds.ClientError("must run on the ipfs daemon")
	}

	return nil, nil
}

// serveHTTPGateway collects options, creates listener, prints status message and starts serving requests
func serveHTTPGateway(req cmds.Request) (error, <-chan error) {
	cfg, err := req.InvocContext().GetConfig()
	if err != nil {
		return fmt.Errorf("serveHTTPGateway: GetConfig() failed: %s", err), nil
	}

	gatewayMaddr, err := ma.NewMultiaddr(cfg.Addresses.Gateway)
	if err != nil {
		return fmt.Errorf("serveHTTPGateway: invalid gateway address: %q (err: %s)", cfg.Addresses.Gateway, err), nil
	}

	writable, writableOptionFound, err := req.Option(writableKwd).Bool()
	if err != nil {
		return fmt.Errorf("serveHTTPGateway: req.Option(%s) failed: %s", writableKwd, err), nil
	}
	if !writableOptionFound {
		writable = cfg.Gateway.Writable
	}

	gwLis, err := manet.Listen(gatewayMaddr)
	if err != nil {
		return fmt.Errorf("serveHTTPGateway: manet.Listen(%s) failed: %s", gatewayMaddr, err), nil
	}
	// we might have listened to /tcp/0 - lets see what we are listing on
	gatewayMaddr = gwLis.Multiaddr()

	if writable {
		fmt.Printf("Gateway (writable) server listening on %s\n", gatewayMaddr)
	} else {
		fmt.Printf("Gateway (readonly) server listening on %s\n", gatewayMaddr)
	}

	var opts = []corehttp.ServeOption{
		corehttp.VersionOption(),
		corehttp.IPNSHostnameOption(),
		corehttp.GatewayOption(writable),
	}

	if len(cfg.Gateway.RootRedirect) > 0 {
		opts = append(opts, corehttp.RedirectOption("", cfg.Gateway.RootRedirect))
	}

	node, err := req.InvocContext().ConstructNode()
	if err != nil {
		return fmt.Errorf("serveHTTPGateway: ConstructNode() failed: %s", err), nil
	}

	errc := make(chan error)
	go func() {
		errc <- corehttp.Serve(node, gwLis.NetListener(), opts...)
		close(errc)
	}()
	return nil, errc
}

func setDataCaller(req cmds.Request, root *dag.Node) (key.Key, error) {
	if len(req.Arguments()) < 3 {
		return "", fmt.Errorf("not enough arguments for set-data")
	}

	nd, err := req.InvocContext().GetNode()
	if err != nil {
		return "", err
	}

	root.Data = []byte(req.Arguments()[2])

	newkey, err := nd.DAG.Add(root)
	if err != nil {
		return "", err
	}

	return newkey, nil
}

func addLinkCaller(req cmds.Request, root *dag.Node) (key.Key, error) {
	if len(req.Arguments()) < 4 {
		return "", fmt.Errorf("not enough arguments for add-link")
	}

	nd, err := req.InvocContext().GetNode()
	if err != nil {
		return "", err
	}

	path := req.Arguments()[2]
	childk := key.B58KeyDecode(req.Arguments()[3])

	create, _, err := req.Option("create").Bool()
	if err != nil {
		return "", err
	}

	var createfunc func() *dag.Node
	if create {
		createfunc = func() *dag.Node {
			return &dag.Node{Data: ft.FolderPBData()}
		}
	}

	e := dagutils.NewDagEditor(nd.DAG, root)

	childnd, err := nd.DAG.Get(req.Context(), childk)
	if err != nil {
		return "", err
	}

	err = e.InsertNodeAtPath(req.Context(), path, childnd, createfunc)
	if err != nil {
		return "", err
	}

	nnode := e.GetNode()

	return nnode.Key()
}

func addLinkCaller(req cmds.Request, root *dag.Node) (key.Key, error) {
	if len(req.Arguments()) < 4 {
		return "", fmt.Errorf("not enough arguments for add-link")
	}

	nd, err := req.InvocContext().GetNode()
	if err != nil {
		return "", err
	}

	path := req.Arguments()[2]
	childk := key.B58KeyDecode(req.Arguments()[3])

	parts := strings.Split(path, "/")

	nnode, err := insertNodeAtPath(req.Context(), nd.DAG, root, parts, childk)
	if err != nil {
		return "", err
	}
	return nnode.Key()
}

// commandShouldRunOnDaemon determines, from commmand details, whether a
// command ought to be executed on an IPFS daemon.
//
// It returns true if the command should be executed on a daemon and false if
// it should be executed on a client. It returns an error if the command must
// NOT be executed on either.
func commandShouldRunOnDaemon(details cmdDetails, req cmds.Request, root *cmds.Command) (bool, error) {
	path := req.Path()
	// root command.
	if len(path) < 1 {
		return false, nil
	}

	if details.cannotRunOnClient && details.cannotRunOnDaemon {
		return false, fmt.Errorf("command disabled: %s", path[0])
	}

	if details.doesNotUseRepo && details.canRunOnClient() {
		return false, nil
	}

	// at this point need to know whether daemon is running. we defer
	// to this point so that some commands dont open files unnecessarily.
	daemonLocked, err := fsrepo.LockedByOtherProcess(req.InvocContext().ConfigRoot)
	if err != nil {
		return false, err
	}

	if daemonLocked {

		log.Info("a daemon is running...")

		if details.cannotRunOnDaemon {
			e := "ipfs daemon is running. please stop it to run this command"
			return false, cmds.ClientError(e)
		}

		return true, nil
	}

	if details.cannotRunOnClient {
		return false, cmds.ClientError("must run on the ipfs daemon")
	}

	return false, nil
}

func rmLinkCaller(req cmds.Request, root *dag.Node) (key.Key, error) {
	if len(req.Arguments()) < 3 {
		return "", fmt.Errorf("not enough arguments for rm-link")
	}

	nd, err := req.InvocContext().GetNode()
	if err != nil {
		return "", err
	}

	path := req.Arguments()[2]

	e := dagutils.NewDagEditor(nd.DAG, root)

	err = e.RmLink(req.Context(), path)
	if err != nil {
		return "", err
	}

	nnode := e.GetNode()

	return nnode.Key()
}

func getBlockForKey(req cmds.Request, skey string) (blocks.Block, error) {
	if len(skey) == 0 {
		return nil, fmt.Errorf("zero length cid invalid")
	}

	n, err := req.InvocContext().GetNode()
	if err != nil {
		return nil, err
	}

	c, err := cid.Decode(skey)
	if err != nil {
		return nil, err
	}

	b, err := n.Blocks.GetBlock(req.Context(), c)
	if err != nil {
		return nil, err
	}

	log.Debugf("ipfs block: got block with key: %s", b.Cid())
	return b, nil
}

func getBlockForKey(req cmds.Request, skey string) (blocks.Block, error) {
	n, err := req.InvocContext().GetNode()
	if err != nil {
		return nil, err
	}

	if !u.IsValidHash(skey) {
		return nil, errors.New("Not a valid hash")
	}

	h, err := mh.FromB58String(skey)
	if err != nil {
		return nil, err
	}

	k := key.Key(h)
	b, err := n.Blocks.GetBlock(req.Context(), k)
	if err != nil {
		return nil, err
	}

	log.Debugf("ipfs block: got block with key: %q", b.Key())
	return b, nil
}

func rmLinkCaller(req cmds.Request, root *dag.Node) (key.Key, error) {
	if len(req.Arguments()) < 3 {
		return "", fmt.Errorf("not enough arguments for rm-link")
	}

	nd, err := req.InvocContext().GetNode()
	if err != nil {
		return "", err
	}

	name := req.Arguments()[2]

	err = root.RemoveNodeLink(name)
	if err != nil {
		return "", err
	}

	newkey, err := nd.DAG.Add(root)
	if err != nil {
		return "", err
	}

	return newkey, nil
}

func callCommand(ctx context.Context, req cmds.Request, root *cmds.Command, cmd *cmds.Command) (cmds.Response, error) {
	log.Info(config.EnvDir, " ", req.InvocContext().ConfigRoot)
	var res cmds.Response

	err := req.SetRootContext(ctx)
	if err != nil {
		return nil, err
	}

	details, err := commandDetails(req.Path(), root)
	if err != nil {
		return nil, err
	}

	log.Debug("looking for running daemon...")
	useDaemon, err := commandShouldRunOnDaemon(*details, req, root)
	if err != nil {
		return nil, err
	}

	err = callPreCommandHooks(ctx, *details, req, root)
	if err != nil {
		return nil, err
	}

	if cmd.PreRun != nil {
		err = cmd.PreRun(req)
		if err != nil {
			return nil, err
		}
	}

	if useDaemon {

		cfg, err := req.InvocContext().GetConfig()
		if err != nil {
			return nil, err
		}

		addr, err := ma.NewMultiaddr(cfg.Addresses.API)
		if err != nil {
			return nil, err
		}

		log.Infof("Executing command on daemon running at %s", addr)
		_, host, err := manet.DialArgs(addr)
		if err != nil {
			return nil, err
		}

		client := cmdsHttp.NewClient(host)

		res, err = client.Send(req)
		if err != nil {
			return nil, err
		}

	} else {
		log.Debug("Executing command locally")

		err := req.SetRootContext(ctx)
		if err != nil {
			return nil, err
		}

		// Okay!!!!! NOW we can call the command.
		res = root.Call(req)

	}

	if cmd.PostRun != nil {
		cmd.PostRun(req, res)
	}

	return res, nil
}

// serveHTTPApi collects options, creates listener, prints status message and starts serving requests
func serveHTTPApi(req cmds.Request) (error, <-chan error) {
	cfg, err := req.InvocContext().GetConfig()
	if err != nil {
		return fmt.Errorf("serveHTTPApi: GetConfig() failed: %s", err), nil
	}

	apiAddr, _, err := req.Option(commands.ApiOption).String()
	if err != nil {
		return fmt.Errorf("serveHTTPApi: %s", err), nil
	}
	if apiAddr == "" {
		apiAddr = cfg.Addresses.API
	}
	apiMaddr, err := ma.NewMultiaddr(apiAddr)
	if err != nil {
		return fmt.Errorf("serveHTTPApi: invalid API address: %q (err: %s)", apiAddr, err), nil
	}

	apiLis, err := manet.Listen(apiMaddr)
	if err != nil {
		return fmt.Errorf("serveHTTPApi: manet.Listen(%s) failed: %s", apiMaddr, err), nil
	}
	// we might have listened to /tcp/0 - lets see what we are listing on
	apiMaddr = apiLis.Multiaddr()
	fmt.Printf("API server listening on %s\n", apiMaddr)

	unrestricted, _, err := req.Option(unrestrictedApiAccessKwd).Bool()
	if err != nil {
		return fmt.Errorf("serveHTTPApi: Option(%s) failed: %s", unrestrictedApiAccessKwd, err), nil
	}

	apiGw := corehttp.NewGateway(corehttp.GatewayConfig{
		Writable: true,
		BlockList: &corehttp.BlockList{
			Decider: func(s string) bool {
				if unrestricted {
					return true
				}
				// for now, only allow paths in the WebUI path
				for _, webuipath := range corehttp.WebUIPaths {
					if strings.HasPrefix(s, webuipath) {
						return true
					}
				}
				return false
			},
		},
	})
	var opts = []corehttp.ServeOption{
		corehttp.CommandsOption(*req.InvocContext()),
		corehttp.WebUIOption,
		apiGw.ServeOption(),
		corehttp.VersionOption(),
		defaultMux("/debug/vars"),
		defaultMux("/debug/pprof/"),
		corehttp.LogOption(),
		corehttp.PrometheusOption("/debug/metrics/prometheus"),
	}

	if len(cfg.Gateway.RootRedirect) > 0 {
		opts = append(opts, corehttp.RedirectOption("", cfg.Gateway.RootRedirect))
	}

	node, err := req.InvocContext().ConstructNode()
	if err != nil {
		return fmt.Errorf("serveHTTPApi: ConstructNode() failed: %s", err), nil
	}

	if err := node.Repo.SetAPIAddr(apiAddr); err != nil {
		return fmt.Errorf("serveHTTPApi: SetAPIAddr() failed: %s", err), nil
	}

	errc := make(chan error)
	go func() {
		errc <- corehttp.Serve(node, apiLis.NetListener(), opts...)
		close(errc)
	}()
	return nil, errc
}