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state.go
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state.go
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package cmdutils
import (
"context"
"encoding/json"
"errors"
"fmt"
"io"
ipfscluster "github.com/ipfs-cluster/ipfs-cluster"
"github.com/ipfs-cluster/ipfs-cluster/api"
"github.com/ipfs-cluster/ipfs-cluster/config"
"github.com/ipfs-cluster/ipfs-cluster/consensus/crdt"
"github.com/ipfs-cluster/ipfs-cluster/consensus/raft"
"github.com/ipfs-cluster/ipfs-cluster/datastore/badger"
"github.com/ipfs-cluster/ipfs-cluster/datastore/inmem"
"github.com/ipfs-cluster/ipfs-cluster/datastore/leveldb"
"github.com/ipfs-cluster/ipfs-cluster/pstoremgr"
"github.com/ipfs-cluster/ipfs-cluster/state"
ds "github.com/ipfs/go-datastore"
)
// StateManager is the interface that allows to import, export and clean
// different cluster states depending on the consensus component used.
type StateManager interface {
ImportState(io.Reader, api.PinOptions) error
ExportState(io.Writer) error
GetStore() (ds.Datastore, error)
GetOfflineState(ds.Datastore) (state.State, error)
Clean() error
}
// NewStateManager returns an state manager implementation for the given
// consensus ("raft" or "crdt"). It will need initialized configs.
func NewStateManager(consensus string, datastore string, ident *config.Identity, cfgs *Configs) (StateManager, error) {
switch consensus {
case cfgs.Raft.ConfigKey():
return &raftStateManager{ident, cfgs}, nil
case cfgs.Crdt.ConfigKey():
return &crdtStateManager{
cfgs: cfgs,
datastore: datastore,
}, nil
case "":
return nil, errors.New("could not determine the consensus component")
default:
return nil, fmt.Errorf("unknown consensus component '%s'", consensus)
}
}
// NewStateManagerWithHelper returns a state manager initialized using the
// configuration and identity provided by the given config helper.
func NewStateManagerWithHelper(cfgHelper *ConfigHelper) (StateManager, error) {
return NewStateManager(
cfgHelper.GetConsensus(),
cfgHelper.GetDatastore(),
cfgHelper.Identity(),
cfgHelper.Configs(),
)
}
type raftStateManager struct {
ident *config.Identity
cfgs *Configs
}
func (raftsm *raftStateManager) GetStore() (ds.Datastore, error) {
return inmem.New(), nil
}
func (raftsm *raftStateManager) GetOfflineState(store ds.Datastore) (state.State, error) {
return raft.OfflineState(raftsm.cfgs.Raft, store)
}
func (raftsm *raftStateManager) ImportState(r io.Reader, opts api.PinOptions) error {
err := raftsm.Clean()
if err != nil {
return err
}
store, err := raftsm.GetStore()
if err != nil {
return err
}
defer store.Close()
st, err := raftsm.GetOfflineState(store)
if err != nil {
return err
}
err = importState(r, st, opts)
if err != nil {
return err
}
pm := pstoremgr.New(context.Background(), nil, raftsm.cfgs.Cluster.GetPeerstorePath())
raftPeers := append(
ipfscluster.PeersFromMultiaddrs(pm.LoadPeerstore()),
raftsm.ident.ID,
)
return raft.SnapshotSave(raftsm.cfgs.Raft, st, raftPeers)
}
func (raftsm *raftStateManager) ExportState(w io.Writer) error {
store, err := raftsm.GetStore()
if err != nil {
return err
}
defer store.Close()
st, err := raftsm.GetOfflineState(store)
if err != nil {
return err
}
return exportState(w, st)
}
func (raftsm *raftStateManager) Clean() error {
return raft.CleanupRaft(raftsm.cfgs.Raft)
}
type crdtStateManager struct {
cfgs *Configs
datastore string
}
func (crdtsm *crdtStateManager) GetStore() (ds.Datastore, error) {
switch crdtsm.datastore {
case crdtsm.cfgs.Badger.ConfigKey():
return badger.New(crdtsm.cfgs.Badger)
case crdtsm.cfgs.LevelDB.ConfigKey():
return leveldb.New(crdtsm.cfgs.LevelDB)
default:
return nil, errors.New("unknown datastore")
}
}
func (crdtsm *crdtStateManager) GetOfflineState(store ds.Datastore) (state.State, error) {
return crdt.OfflineState(crdtsm.cfgs.Crdt, store)
}
func (crdtsm *crdtStateManager) ImportState(r io.Reader, opts api.PinOptions) error {
err := crdtsm.Clean()
if err != nil {
return err
}
store, err := crdtsm.GetStore()
if err != nil {
return err
}
defer store.Close()
st, err := crdtsm.GetOfflineState(store)
if err != nil {
return err
}
batchingSt := st.(state.BatchingState)
err = importState(r, batchingSt, opts)
if err != nil {
return err
}
return batchingSt.Commit(context.Background())
}
func (crdtsm *crdtStateManager) ExportState(w io.Writer) error {
store, err := crdtsm.GetStore()
if err != nil {
return err
}
defer store.Close()
st, err := crdtsm.GetOfflineState(store)
if err != nil {
return err
}
return exportState(w, st)
}
func (crdtsm *crdtStateManager) Clean() error {
store, err := crdtsm.GetStore()
if err != nil {
return err
}
defer store.Close()
return crdt.Clean(context.Background(), crdtsm.cfgs.Crdt, store)
}
func importState(r io.Reader, st state.State, opts api.PinOptions) error {
ctx := context.Background()
dec := json.NewDecoder(r)
for {
var pin api.Pin
err := dec.Decode(&pin)
if err == io.EOF {
return nil
}
if err != nil {
return err
}
if opts.ReplicationFactorMax > 0 {
pin.ReplicationFactorMax = opts.ReplicationFactorMax
}
if opts.ReplicationFactorMin > 0 {
pin.ReplicationFactorMin = opts.ReplicationFactorMin
}
if len(opts.UserAllocations) > 0 {
// We are injecting directly to the state.
// UserAllocation option is not stored in the state.
// We need to set Allocations directly.
pin.Allocations = opts.UserAllocations
}
err = st.Add(ctx, pin)
if err != nil {
return err
}
}
}
// ExportState saves a json representation of a state
func exportState(w io.Writer, st state.State) error {
out := make(chan api.Pin, 10000)
errCh := make(chan error, 1)
go func() {
defer close(errCh)
errCh <- st.List(context.Background(), out)
}()
var err error
enc := json.NewEncoder(w)
for pin := range out {
if err == nil {
err = enc.Encode(pin)
}
}
if err != nil {
return err
}
err = <-errCh
return err
}