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methods.go
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methods.go
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package client
import (
"bytes"
"context"
"encoding/json"
"errors"
"fmt"
"net/url"
"os"
"path"
"path/filepath"
"strings"
"time"
"github.com/elastos/Elastos.NET.Hive.Cluster/api"
cid "github.com/ipfs/go-cid"
files "github.com/ipfs/go-ipfs-files"
peer "github.com/libp2p/go-libp2p-peer"
)
// ID returns information about the cluster Peer.
func (c *defaultClient) ID() (api.ID, error) {
var id api.IDSerial
err := c.do("GET", "/id", nil, nil, &id)
return id.ToID(), err
}
// Peers requests ID information for all cluster peers.
func (c *defaultClient) Peers() ([]api.ID, error) {
var ids []api.IDSerial
err := c.do("GET", "/peers", nil, nil, &ids)
result := make([]api.ID, len(ids))
for i, id := range ids {
result[i] = id.ToID()
}
return result, err
}
type peerAddBody struct {
PeerID string `json:"peer_id"`
}
// PeerAdd adds a new peer to the cluster.
func (c *defaultClient) PeerAdd(pid peer.ID) (api.ID, error) {
pidStr := peer.IDB58Encode(pid)
body := peerAddBody{pidStr}
var buf bytes.Buffer
enc := json.NewEncoder(&buf)
enc.Encode(body)
var id api.IDSerial
err := c.do("POST", "/peers", nil, &buf, &id)
return id.ToID(), err
}
// PeerRm removes a current peer from the cluster
func (c *defaultClient) PeerRm(id peer.ID) error {
return c.do("DELETE", fmt.Sprintf("/peers/%s", id.Pretty()), nil, nil, nil)
}
// Pin tracks a Cid with the given replication factor and a name for
// human-friendliness.
func (c *defaultClient) Pin(ci cid.Cid, replicationFactorMin, replicationFactorMax int, name string) error {
escName := url.QueryEscape(name)
err := c.do(
"POST",
fmt.Sprintf(
"/pins/%s?replication-min=%d&replication-max=%d&name=%s",
ci.String(),
replicationFactorMin,
replicationFactorMax,
escName,
),
nil,
nil,
nil,
)
return err
}
// Unpin untracks a Cid from cluster.
func (c *defaultClient) Unpin(ci cid.Cid) error {
return c.do("DELETE", fmt.Sprintf("/pins/%s", ci.String()), nil, nil, nil)
}
// Allocations returns the consensus state listing all tracked items and
// the peers that should be pinning them.
func (c *defaultClient) Allocations(filter api.PinType) ([]api.Pin, error) {
var pins []api.PinSerial
types := []api.PinType{
api.DataType,
api.MetaType,
api.ClusterDAGType,
api.ShardType,
}
var strFilter []string
if filter == api.AllType {
strFilter = []string{"all"}
} else {
for _, t := range types {
if t&filter > 0 { // the filter includes this type
strFilter = append(strFilter, t.String())
}
}
}
f := url.QueryEscape(strings.Join(strFilter, ","))
err := c.do("GET", fmt.Sprintf("/allocations?filter=%s", f), nil, nil, &pins)
result := make([]api.Pin, len(pins))
for i, p := range pins {
result[i] = p.ToPin()
}
return result, err
}
// Allocation returns the current allocations for a given Cid.
func (c *defaultClient) Allocation(ci cid.Cid) (api.Pin, error) {
var pin api.PinSerial
err := c.do("GET", fmt.Sprintf("/allocations/%s", ci.String()), nil, nil, &pin)
return pin.ToPin(), err
}
// Status returns the current ipfs state for a given Cid. If local is true,
// the information affects only the current peer, otherwise the information
// is fetched from all cluster peers.
func (c *defaultClient) Status(ci cid.Cid, local bool) (api.GlobalPinInfo, error) {
var gpi api.GlobalPinInfoSerial
err := c.do("GET", fmt.Sprintf("/pins/%s?local=%t", ci.String(), local), nil, nil, &gpi)
return gpi.ToGlobalPinInfo(), err
}
// StatusAll gathers Status() for all tracked items. If a filter is
// provided, only entries matching the given filter statuses
// will be returned. A filter can be built by merging TrackerStatuses with
// a bitwise OR operation (st1 | st2 | ...). A "0" filter value (or
// api.TrackerStatusUndefined), means all.
func (c *defaultClient) StatusAll(filter api.TrackerStatus, local bool) ([]api.GlobalPinInfo, error) {
var gpis []api.GlobalPinInfoSerial
filterStr := ""
if filter != api.TrackerStatusUndefined { // undefined filter means "all"
filterStr = filter.String()
if filterStr == "" {
return nil, errors.New("invalid filter value")
}
}
err := c.do("GET", fmt.Sprintf("/pins?local=%t&filter=%s", local, url.QueryEscape(filterStr)), nil, nil, &gpis)
result := make([]api.GlobalPinInfo, len(gpis))
for i, p := range gpis {
result[i] = p.ToGlobalPinInfo()
}
return result, err
}
// Sync makes sure the state of a Cid corresponds to the state reported by
// the ipfs daemon, and returns it. If local is true, this operation only
// happens on the current peer, otherwise it happens on every cluster peer.
func (c *defaultClient) Sync(ci cid.Cid, local bool) (api.GlobalPinInfo, error) {
var gpi api.GlobalPinInfoSerial
err := c.do("POST", fmt.Sprintf("/pins/%s/sync?local=%t", ci.String(), local), nil, nil, &gpi)
return gpi.ToGlobalPinInfo(), err
}
// SyncAll triggers Sync() operations for all tracked items. It only returns
// informations for items that were de-synced or have an error state. If
// local is true, the operation is limited to the current peer. Otherwise
// it happens on every cluster peer.
func (c *defaultClient) SyncAll(local bool) ([]api.GlobalPinInfo, error) {
var gpis []api.GlobalPinInfoSerial
err := c.do("POST", fmt.Sprintf("/pins/sync?local=%t", local), nil, nil, &gpis)
result := make([]api.GlobalPinInfo, len(gpis))
for i, p := range gpis {
result[i] = p.ToGlobalPinInfo()
}
return result, err
}
// Recover retriggers pin or unpin ipfs operations for a Cid in error state.
// If local is true, the operation is limited to the current peer, otherwise
// it happens on every cluster peer.
func (c *defaultClient) Recover(ci cid.Cid, local bool) (api.GlobalPinInfo, error) {
var gpi api.GlobalPinInfoSerial
err := c.do("POST", fmt.Sprintf("/pins/%s/recover?local=%t", ci.String(), local), nil, nil, &gpi)
return gpi.ToGlobalPinInfo(), err
}
// RecoverAll triggers Recover() operations on all tracked items. If local is
// true, the operation is limited to the current peer. Otherwise, it happens
// everywhere.
func (c *defaultClient) RecoverAll(local bool) ([]api.GlobalPinInfo, error) {
var gpis []api.GlobalPinInfoSerial
err := c.do("POST", fmt.Sprintf("/pins/recover?local=%t", local), nil, nil, &gpis)
result := make([]api.GlobalPinInfo, len(gpis))
for i, p := range gpis {
result[i] = p.ToGlobalPinInfo()
}
return result, err
}
// Version returns the ipfs-cluster peer's version.
func (c *defaultClient) Version() (api.Version, error) {
var ver api.Version
err := c.do("GET", "/version", nil, nil, &ver)
return ver, err
}
// GetConnectGraph returns an ipfs-cluster connection graph.
// The serialized version, strings instead of pids, is returned
func (c *defaultClient) GetConnectGraph() (api.ConnectGraphSerial, error) {
var graphS api.ConnectGraphSerial
err := c.do("GET", "/health/graph", nil, nil, &graphS)
return graphS, err
}
// Metrics returns a map with the latest valid metrics of the given name
// for the current cluster peers.
func (c *defaultClient) Metrics(name string) ([]api.Metric, error) {
if name == "" {
return nil, errors.New("bad metric name")
}
var metrics []api.Metric
err := c.do("GET", fmt.Sprintf("/monitor/metrics/%s", name), nil, nil, &metrics)
return metrics, err
}
// WaitFor is a utility function that allows for a caller to wait for a
// paticular status for a CID (as defined by StatusFilterParams).
// It returns the final status for that CID and an error, if there was.
//
// WaitFor works by calling Status() repeatedly and checking that all
// peers have transitioned to the target TrackerStatus or are Remote.
// If an error of some type happens, WaitFor returns immediately with an
// empty GlobalPinInfo.
func WaitFor(ctx context.Context, c Client, fp StatusFilterParams) (api.GlobalPinInfo, error) {
ctx, cancel := context.WithCancel(ctx)
defer cancel()
sf := newStatusFilter()
go sf.pollStatus(ctx, c, fp)
go sf.filter(ctx, fp)
var status api.GlobalPinInfo
for {
select {
case <-ctx.Done():
return api.GlobalPinInfo{}, ctx.Err()
case err := <-sf.Err:
return api.GlobalPinInfo{}, err
case st, ok := <-sf.Out:
if !ok { // channel closed
return status, nil
}
status = st
}
}
}
// StatusFilterParams contains the parameters required
// to filter a stream of status results.
type StatusFilterParams struct {
Cid cid.Cid
Local bool
Target api.TrackerStatus
CheckFreq time.Duration
}
type statusFilter struct {
In, Out chan api.GlobalPinInfo
Done chan struct{}
Err chan error
}
func newStatusFilter() *statusFilter {
return &statusFilter{
In: make(chan api.GlobalPinInfo),
Out: make(chan api.GlobalPinInfo),
Done: make(chan struct{}),
Err: make(chan error),
}
}
func (sf *statusFilter) filter(ctx context.Context, fp StatusFilterParams) {
defer close(sf.Done)
defer close(sf.Out)
for {
select {
case <-ctx.Done():
sf.Err <- ctx.Err()
return
case gblPinInfo, more := <-sf.In:
if !more {
return
}
ok, err := statusReached(fp.Target, gblPinInfo)
if err != nil {
sf.Err <- err
return
}
sf.Out <- gblPinInfo
if !ok {
continue
}
return
}
}
}
func (sf *statusFilter) pollStatus(ctx context.Context, c Client, fp StatusFilterParams) {
ticker := time.NewTicker(fp.CheckFreq)
defer ticker.Stop()
for {
select {
case <-ctx.Done():
sf.Err <- ctx.Err()
return
case <-ticker.C:
gblPinInfo, err := c.Status(fp.Cid, fp.Local)
if err != nil {
sf.Err <- err
return
}
logger.Debugf("pollStatus: status: %#v", gblPinInfo)
sf.In <- gblPinInfo
case <-sf.Done:
close(sf.In)
return
}
}
}
func statusReached(target api.TrackerStatus, gblPinInfo api.GlobalPinInfo) (bool, error) {
for _, pinInfo := range gblPinInfo.PeerMap {
switch pinInfo.Status {
case target:
continue
case api.TrackerStatusUndefined, api.TrackerStatusClusterError, api.TrackerStatusPinError, api.TrackerStatusUnpinError:
return false, fmt.Errorf("error has occurred while attempting to reach status: %s", target.String())
case api.TrackerStatusRemote:
if target == api.TrackerStatusPinned {
continue // to next pinInfo
}
return false, nil
default:
return false, nil
}
}
return true, nil
}
// logic drawn from go-ipfs-cmds/cli/parse.go: appendFile
func makeSerialFile(fpath string, params *api.AddParams) (files.Node, error) {
if fpath == "." {
cwd, err := os.Getwd()
if err != nil {
return nil, err
}
cwd, err = filepath.EvalSymlinks(cwd)
if err != nil {
return nil, err
}
fpath = cwd
}
fpath = filepath.ToSlash(filepath.Clean(fpath))
stat, err := os.Lstat(fpath)
if err != nil {
return nil, err
}
if stat.IsDir() {
if !params.Recursive {
return nil, fmt.Errorf("%s is a directory, but Recursive option is not set", fpath)
}
}
return files.NewSerialFile(fpath, params.Hidden, stat)
}
// Add imports files to the cluster from the given paths. A path can
// either be a local filesystem location or an web url (http:// or https://).
// In the latter case, the destination will be downloaded with a GET request.
// The AddParams allow to control different options, like enabling the
// sharding the resulting DAG across the IPFS daemons of multiple cluster
// peers. The output channel will receive regular updates as the adding
// process progresses.
func (c *defaultClient) Add(
paths []string,
params *api.AddParams,
out chan<- *api.AddedOutput,
) error {
addFiles := make([]files.DirEntry, len(paths), len(paths))
for i, p := range paths {
u, err := url.Parse(p)
if err != nil {
close(out)
return fmt.Errorf("error parsing path: %s", err)
}
name := path.Base(p)
var addFile files.Node
if strings.HasPrefix(u.Scheme, "http") {
addFile = files.NewWebFile(u)
name = path.Base(u.Path)
} else {
addFile, err = makeSerialFile(p, params)
if err != nil {
close(out)
return err
}
}
addFiles[i] = files.FileEntry(name, addFile)
}
sliceFile := files.NewSliceDirectory(addFiles)
// If `form` is set to true, the multipart data will have
// a Content-Type of 'multipart/form-data', if `form` is false,
// the Content-Type will be 'multipart/mixed'.
return c.AddMultiFile(files.NewMultiFileReader(sliceFile, true), params, out)
}
// AddMultiFile imports new files from a MultiFileReader. See Add().
func (c *defaultClient) AddMultiFile(
multiFileR *files.MultiFileReader,
params *api.AddParams,
out chan<- *api.AddedOutput,
) error {
defer close(out)
headers := make(map[string]string)
headers["Content-Type"] = "multipart/form-data; boundary=" + multiFileR.Boundary()
// This method must run with StreamChannels set.
params.StreamChannels = true
queryStr := params.ToQueryString()
// our handler decodes an AddedOutput and puts it
// in the out channel.
handler := func(dec *json.Decoder) error {
if out == nil {
return nil
}
var obj api.AddedOutput
err := dec.Decode(&obj)
if err != nil {
return err
}
out <- &obj
return nil
}
err := c.doStream(
"POST",
"/add?"+queryStr,
headers,
multiFileR,
handler,
)
return err
}