Merge pull request #4575 from ipfs/feat/coreapi/pin

coreapi: Pin API

core/coreapi/coreapi.go

@@ -52,6 +52,10 @@ func (api *CoreAPI) Object() coreiface.ObjectAPI {
 	return &ObjectAPI{api, nil}
 }
 
+func (api *CoreAPI) Pin() coreiface.PinAPI {
+	return &PinAPI{api, nil}
+}
+
 // ResolveNode resolves the path `p` using Unixfx resolver, gets and returns the
 // resolved Node.
 func (api *CoreAPI) ResolveNode(ctx context.Context, p coreiface.Path) (coreiface.Node, error) {

core/coreapi/interface/interface.go

@@ -58,6 +58,33 @@ type BlockStat interface {
 	Path() Path
 }
 
+// Pin holds information about pinned resource
+type Pin interface {
+	// Path to the pinned object
+	Path() Path
+
+	// Type of the pin
+	Type() string
+}
+
+// PinStatus holds information about pin health
+type PinStatus interface {
+	// Ok indicates whether the pin has been verified to be correct
+	Ok() bool
+
+	// BadNodes returns any bad (usually missing) nodes from the pin
+	BadNodes() []BadPinNode
+}
+
+// BadPinNode is a node that has been marked as bad by Pin.Verify
+type BadPinNode interface {
+	// Path is the path of the node
+	Path() Path
+
+	// Err is the reason why the node has been marked as bad
+	Err() error
+}
+
 // CoreAPI defines an unified interface to IPFS for Go programs.
 type CoreAPI interface {
 	// Unixfs returns an implementation of Unixfs API.
@@ -74,6 +101,7 @@ type CoreAPI interface {
 
 	// Key returns an implementation of Key API.
 	Key() KeyAPI
+	Pin() PinAPI
 
 	// ObjectAPI returns an implementation of Object API
 	Object() ObjectAPI
@@ -322,5 +350,40 @@ type ObjectStat struct {
 	CumulativeSize int
 }
 
+// PinAPI specifies the interface to pining
+type PinAPI interface {
+	// Add creates new pin, be default recursive - pinning the whole referenced
+	// tree
+	Add(context.Context, Path, ...options.PinAddOption) error
+
+	// WithRecursive is an option for Add which specifies whether to pin an entire
+	// object tree or just one object. Default: true
+	WithRecursive(bool) options.PinAddOption
+
+	// Ls returns list of pinned objects on this node
+	Ls(context.Context, ...options.PinLsOption) ([]Pin, error)
+
+	// WithType is an option for Ls which allows to specify which pin types should
+	// be returned
+	//
+	// Supported values:
+	// * "direct" - directly pinned objects
+	// * "recursive" - roots of recursive pins
+	// * "indirect" - indirectly pinned objects (referenced by recursively pinned
+	//    objects)
+	// * "all" - all pinned objects (default)
+	WithType(string) options.PinLsOption
+
+	// Rm removes pin for object specified by the path
+	Rm(context.Context, Path) error
+
+	// Update changes one pin to another, skipping checks for matching paths in
+	// the old tree
+	Update(ctx context.Context, from Path, to Path, opts ...options.PinUpdateOption) error
+
+	// Verify verifies the integrity of pinned objects
+	Verify(context.Context) (<-chan PinStatus, error)
+}
+
 var ErrIsDir = errors.New("object is a directory")
 var ErrOffline = errors.New("can't resolve, ipfs node is offline")

core/coreapi/interface/options/pin.go

@@ -0,0 +1,85 @@
+package options
+
+type PinAddSettings struct {
+	Recursive bool
+}
+
+type PinLsSettings struct {
+	Type string
+}
+
+type PinUpdateSettings struct {
+	Unpin bool
+}
+
+type PinAddOption func(*PinAddSettings) error
+type PinLsOption func(settings *PinLsSettings) error
+type PinUpdateOption func(*PinUpdateSettings) error
+
+func PinAddOptions(opts ...PinAddOption) (*PinAddSettings, error) {
+	options := &PinAddSettings{
+		Recursive: true,
+	}
+
+	for _, opt := range opts {
+		err := opt(options)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return options, nil
+}
+
+func PinLsOptions(opts ...PinLsOption) (*PinLsSettings, error) {
+	options := &PinLsSettings{
+		Type: "all",
+	}
+
+	for _, opt := range opts {
+		err := opt(options)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return options, nil
+}
+
+func PinUpdateOptions(opts ...PinUpdateOption) (*PinUpdateSettings, error) {
+	options := &PinUpdateSettings{
+		Unpin: true,
+	}
+
+	for _, opt := range opts {
+		err := opt(options)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return options, nil
+}
+
+type PinOptions struct{}
+
+func (api *PinOptions) WithRecursive(recucsive bool) PinAddOption {
+	return func(settings *PinAddSettings) error {
+		settings.Recursive = recucsive
+		return nil
+	}
+}
+
+func (api *PinOptions) WithType(t string) PinLsOption {
+	return func(settings *PinLsSettings) error {
+		settings.Type = t
+		return nil
+	}
+}
+
+func (api *PinOptions) WithUnpin(unpin bool) PinUpdateOption {
+	return func(settings *PinUpdateSettings) error {
+		settings.Unpin = unpin
+		return nil
+	}
+}

core/coreapi/pin.go

@@ -0,0 +1,196 @@
+package coreapi
+
+import (
+	"context"
+	"fmt"
+
+	bserv "github.com/ipfs/go-ipfs/blockservice"
+	coreiface "github.com/ipfs/go-ipfs/core/coreapi/interface"
+	caopts "github.com/ipfs/go-ipfs/core/coreapi/interface/options"
+	corerepo "github.com/ipfs/go-ipfs/core/corerepo"
+	offline "github.com/ipfs/go-ipfs/exchange/offline"
+	merkledag "github.com/ipfs/go-ipfs/merkledag"
+	pin "github.com/ipfs/go-ipfs/pin"
+
+	cid "gx/ipfs/QmcZfnkapfECQGcLZaf9B79NRg7cRa9EnZh4LSbkCzwNvY/go-cid"
+	ipld "gx/ipfs/Qme5bWv7wtjUNGsK2BNGVUFPKiuxWrsqrtvYwCLRw8YFES/go-ipld-format"
+)
+
+type PinAPI struct {
+	*CoreAPI
+	*caopts.PinOptions
+}
+
+func (api *PinAPI) Add(ctx context.Context, p coreiface.Path, opts ...caopts.PinAddOption) error {
+	settings, err := caopts.PinAddOptions(opts...)
+	if err != nil {
+		return err
+	}
+
+	defer api.node.Blockstore.PinLock().Unlock()
+
+	_, err = corerepo.Pin(api.node, ctx, []string{p.String()}, settings.Recursive)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (api *PinAPI) Ls(ctx context.Context, opts ...caopts.PinLsOption) ([]coreiface.Pin, error) {
+	settings, err := caopts.PinLsOptions(opts...)
+	if err != nil {
+		return nil, err
+	}
+
+	switch settings.Type {
+	case "all", "direct", "indirect", "recursive":
+	default:
+		return nil, fmt.Errorf("invalid type '%s', must be one of {direct, indirect, recursive, all}", settings.Type)
+	}
+
+	return pinLsAll(settings.Type, ctx, api.node.Pinning, api.node.DAG)
+}
+
+func (api *PinAPI) Rm(ctx context.Context, p coreiface.Path) error {
+	_, err := corerepo.Unpin(api.node, ctx, []string{p.String()}, true)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (api *PinAPI) Update(ctx context.Context, from coreiface.Path, to coreiface.Path, opts ...caopts.PinUpdateOption) error {
+	settings, err := caopts.PinUpdateOptions(opts...)
+	if err != nil {
+		return err
+	}
+
+	return api.node.Pinning.Update(ctx, from.Cid(), to.Cid(), settings.Unpin)
+}
+
+type pinStatus struct {
+	cid      *cid.Cid
+	ok       bool
+	badNodes []coreiface.BadPinNode
+}
+
+// BadNode is used in PinVerifyRes
+type badNode struct {
+	cid *cid.Cid
+	err error
+}
+
+func (s *pinStatus) Ok() bool {
+	return s.ok
+}
+
+func (s *pinStatus) BadNodes() []coreiface.BadPinNode {
+	return s.badNodes
+}
+
+func (n *badNode) Path() coreiface.Path {
+	return ParseCid(n.cid)
+}
+
+func (n *badNode) Err() error {
+	return n.err
+}
+
+func (api *PinAPI) Verify(ctx context.Context) (<-chan coreiface.PinStatus, error) {
+	visited := make(map[string]*pinStatus)
+	bs := api.node.Blocks.Blockstore()
+	DAG := merkledag.NewDAGService(bserv.New(bs, offline.Exchange(bs)))
+	getLinks := merkledag.GetLinksWithDAG(DAG)
+	recPins := api.node.Pinning.RecursiveKeys()
+
+	var checkPin func(root *cid.Cid) *pinStatus
+	checkPin = func(root *cid.Cid) *pinStatus {
+		key := root.String()
+		if status, ok := visited[key]; ok {
+			return status
+		}
+
+		links, err := getLinks(ctx, root)
+		if err != nil {
+			status := &pinStatus{ok: false, cid: root}
+			status.badNodes = []coreiface.BadPinNode{&badNode{cid: root, err: err}}
+			visited[key] = status
+			return status
+		}
+
+		status := &pinStatus{ok: true, cid: root}
+		for _, lnk := range links {
+			res := checkPin(lnk.Cid)
+			if !res.ok {
+				status.ok = false
+				status.badNodes = append(status.badNodes, res.badNodes...)
+			}
+		}
+
+		visited[key] = status
+		return status
+	}
+
+	out := make(chan coreiface.PinStatus)
+	go func() {
+		defer close(out)
+		for _, c := range recPins {
+			out <- checkPin(c)
+		}
+	}()
+
+	return out, nil
+}
+
+type pinInfo struct {
+	pinType string
+	object  *cid.Cid
+}
+
+func (p *pinInfo) Path() coreiface.Path {
+	return ParseCid(p.object)
+}
+
+func (p *pinInfo) Type() string {
+	return p.pinType
+}
+
+func pinLsAll(typeStr string, ctx context.Context, pinning pin.Pinner, dag ipld.DAGService) ([]coreiface.Pin, error) {
+
+	keys := make(map[string]*pinInfo)
+
+	AddToResultKeys := func(keyList []*cid.Cid, typeStr string) {
+		for _, c := range keyList {
+			keys[c.String()] = &pinInfo{
+				pinType: typeStr,
+				object:  c,
+			}
+		}
+	}
+
+	if typeStr == "direct" || typeStr == "all" {
+		AddToResultKeys(pinning.DirectKeys(), "direct")
+	}
+	if typeStr == "indirect" || typeStr == "all" {
+		set := cid.NewSet()
+		for _, k := range pinning.RecursiveKeys() {
+			err := merkledag.EnumerateChildren(ctx, merkledag.GetLinksWithDAG(dag), k, set.Visit)
+			if err != nil {
+				return nil, err
+			}
+		}
+		AddToResultKeys(set.Keys(), "indirect")
+	}
+	if typeStr == "recursive" || typeStr == "all" {
+		AddToResultKeys(pinning.RecursiveKeys(), "recursive")
+	}
+
+	out := make([]coreiface.Pin, 0, len(keys))
+	for _, v := range keys {
+		out = append(out, v)
+	}
+
+	return out, nil
+}