Add state sync support

CHANGELOG.md

@@ -157,6 +157,7 @@ be used to retrieve the actual proposal `Content`. Also the `NewMsgSubmitProposa
 * (modules) [\#6734](https://github.com/cosmos/cosmos-sdk/issues/6834) Add `TxEncodingConfig` parameter to `AppModuleBasic.ValidateGenesis` command to support JSON tx decoding in `genutil`.
 * (genesis) [\#7000](https://github.com/cosmos/cosmos-sdk/pull/7000) The root `GenesisState` is now decoded using `encoding/json` instead of amino so `int64` and `uint64` types are now encoded as integers as opposed to strings.
 * (types) [\#7032](https://github.com/cosmos/cosmos-sdk/pull/7032) All types ending with `ID` (e.g. `ProposalID`) now end with `Id` (e.g. `ProposalId`), to match default Protobuf generated format. Also see [\#7033](https://github.com/cosmos/cosmos-sdk/pull/7033) for more details.
+* (store) [\#5803](https://github.com/cosmos/cosmos-sdk/pull/5803) The `store.CommitMultiStore` interface now includes the new `snapshots.Snapshotter` interface as well.
 
 ### Features
 
@@ -166,6 +167,8 @@ be used to retrieve the actual proposal `Content`. Also the `NewMsgSubmitProposa
 * (crypto/multisig) [\#6241](https://github.com/cosmos/cosmos-sdk/pull/6241) Add Multisig type directly to the repo. Previously this was in tendermint.
 * (rest) [\#6167](https://github.com/cosmos/cosmos-sdk/pull/6167) Support `max-body-bytes` CLI flag for the REST service.
 * (x/ibc) [\#5588](https://github.com/cosmos/cosmos-sdk/pull/5588) Add [ICS 024 - Host State Machine Requirements](https://github.com/cosmos/ics/tree/master/spec/ics-024-host-requirements) subpackage to `x/ibc` module.
+* (baseapp) [\#5803](https://github.com/cosmos/cosmos-sdk/pull/5803) Added support for taking state snapshots at regular height intervals, via options `snapshot-interval` and `snapshot-retention`.
+* (store) [\#5803](https://github.com/cosmos/cosmos-sdk/pull/5803) Added `rootmulti.Store` methods for taking and restoring snapshots, based on `iavl.Store` export/import.
 * (x/ibc) [\#5277](https://github.com/cosmos/cosmos-sdk/pull/5277) `x/ibc` changes from IBC alpha. For more details check the the  [`x/ibc/spec`](https://github.com/cosmos/tree/master/x/ibc/spec) directory:
   * [ICS 002 - Client Semantics](https://github.com/cosmos/ics/tree/master/spec/ics-002-client-semantics) subpackage
   * [ICS 003 - Connection Semantics](https://github.com/cosmos/ics/blob/master/spec/ics-003-connection-semantics) subpackage

baseapp/abci.go

@@ -1,6 +1,7 @@
 package baseapp
 
 import (
+	"errors"
 	"fmt"
 	"os"
 	"sort"
@@ -15,6 +16,7 @@ import (
 	grpcstatus "google.golang.org/grpc/status"
 
 	"github.com/cosmos/cosmos-sdk/codec"
+	snapshottypes "github.com/cosmos/cosmos-sdk/snapshots/types"
 	"github.com/cosmos/cosmos-sdk/telemetry"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
@@ -297,6 +299,10 @@ func (app *BaseApp) Commit() (res abci.ResponseCommit) {
 		app.halt()
 	}
 
+	if app.snapshotInterval > 0 && uint64(header.Height)%app.snapshotInterval == 0 {
+		go app.snapshot(header.Height)
+	}
+
 	return abci.ResponseCommit{
 		Data: commitID.Hash,
 	}
@@ -324,6 +330,27 @@ func (app *BaseApp) halt() {
 	os.Exit(0)
 }
 
+// snapshot takes a snapshot of the current state and prunes any old snapshottypes.
+func (app *BaseApp) snapshot(height int64) {
+	app.logger.Info("Creating state snapshot", "height", height)
+	snapshot, err := app.snapshotManager.Create(uint64(height))
+	if err != nil {
+		app.logger.Error("Failed to create state snapshot", "height", height, "err", err)
+		return
+	}
+	app.logger.Info("Completed state snapshot", "height", height, "format", snapshot.Format)
+
+	if app.snapshotKeepRecent > 0 {
+		app.logger.Debug("Pruning state snapshots")
+		pruned, err := app.snapshotManager.Prune(app.snapshotKeepRecent)
+		if err != nil {
+			app.logger.Error("Failed to prune state snapshots", "err", err)
+			return
+		}
+		app.logger.Debug("Pruned state snapshots", "pruned", pruned)
+	}
+}
+
 // Query implements the ABCI interface. It delegates to CommitMultiStore if it
 // implements Queryable.
 func (app *BaseApp) Query(req abci.RequestQuery) abci.ResponseQuery {
@@ -358,6 +385,100 @@ func (app *BaseApp) Query(req abci.RequestQuery) abci.ResponseQuery {
 	return sdkerrors.QueryResult(sdkerrors.Wrap(sdkerrors.ErrUnknownRequest, "unknown query path"))
 }
 
+// ListSnapshots implements the ABCI interface. It delegates to app.snapshotManager if set.
+func (app *BaseApp) ListSnapshots(req abci.RequestListSnapshots) abci.ResponseListSnapshots {
+	resp := abci.ResponseListSnapshots{Snapshots: []*abci.Snapshot{}}
+	if app.snapshotManager == nil {
+		return resp
+	}
+
+	snapshots, err := app.snapshotManager.List()
+	if err != nil {
+		app.logger.Error("Failed to list snapshots", "err", err)
+		return resp
+	}
+	for _, snapshot := range snapshots {
+		abciSnapshot, err := snapshot.ToABCI()
+		if err != nil {
+			app.logger.Error("Failed to list snapshots", "err", err)
+			return resp
+		}
+		resp.Snapshots = append(resp.Snapshots, &abciSnapshot)
+	}
+
+	return resp
+}
+
+// LoadSnapshotChunk implements the ABCI interface. It delegates to app.snapshotManager if set.
+func (app *BaseApp) LoadSnapshotChunk(req abci.RequestLoadSnapshotChunk) abci.ResponseLoadSnapshotChunk {
+	if app.snapshotManager == nil {
+		return abci.ResponseLoadSnapshotChunk{}
+	}
+	chunk, err := app.snapshotManager.LoadChunk(req.Height, req.Format, req.Chunk)
+	if err != nil {
+		app.logger.Error("Failed to load snapshot chunk", "height", req.Height, "format", req.Format,
+			"chunk", req.Chunk, "err")
+		return abci.ResponseLoadSnapshotChunk{}
+	}
+	return abci.ResponseLoadSnapshotChunk{Chunk: chunk}
+}
+
+// OfferSnapshot implements the ABCI interface. It delegates to app.snapshotManager if set.
+func (app *BaseApp) OfferSnapshot(req abci.RequestOfferSnapshot) abci.ResponseOfferSnapshot {
+	if req.Snapshot == nil {
+		app.logger.Error("Received nil snapshot")
+		return abci.ResponseOfferSnapshot{Result: abci.ResponseOfferSnapshot_REJECT}
+	}
+
+	snapshot, err := snapshottypes.SnapshotFromABCI(req.Snapshot)
+	if err != nil {
+		app.logger.Error("Failed to decode snapshot metadata", "err", err)
+		return abci.ResponseOfferSnapshot{Result: abci.ResponseOfferSnapshot_REJECT}
+	}
+	err = app.snapshotManager.Restore(snapshot)
+	switch {
+	case err == nil:
+		return abci.ResponseOfferSnapshot{Result: abci.ResponseOfferSnapshot_ACCEPT}
+
+	case errors.Is(err, snapshottypes.ErrUnknownFormat):
+		return abci.ResponseOfferSnapshot{Result: abci.ResponseOfferSnapshot_REJECT_FORMAT}
+
+	case errors.Is(err, snapshottypes.ErrInvalidMetadata):
+		app.logger.Error("Rejecting invalid snapshot", "height", req.Snapshot.Height,
+			"format", req.Snapshot.Format, "err", err)
+		return abci.ResponseOfferSnapshot{Result: abci.ResponseOfferSnapshot_REJECT}
+
+	default:
+		app.logger.Error("Failed to restore snapshot", "height", req.Snapshot.Height,
+			"format", req.Snapshot.Format, "err", err)
+		// We currently don't support resetting the IAVL stores and retrying a different snapshot,
+		// so we ask Tendermint to abort all snapshot restoration.
+		return abci.ResponseOfferSnapshot{Result: abci.ResponseOfferSnapshot_ABORT}
+	}
+}
+
+// ApplySnapshotChunk implements the ABCI interface. It delegates to app.snapshotManager if set.
+func (app *BaseApp) ApplySnapshotChunk(req abci.RequestApplySnapshotChunk) abci.ResponseApplySnapshotChunk {
+	_, err := app.snapshotManager.RestoreChunk(req.Chunk)
+	switch {
+	case err == nil:
+		return abci.ResponseApplySnapshotChunk{Result: abci.ResponseApplySnapshotChunk_ACCEPT}
+
+	case errors.Is(err, snapshottypes.ErrChunkHashMismatch):
+		app.logger.Error("Chunk checksum mismatch, rejecting sender and requesting refetch",
+			"chunk", req.Index, "sender", req.Sender, "err", err)
+		return abci.ResponseApplySnapshotChunk{
+			Result:        abci.ResponseApplySnapshotChunk_RETRY,
+			RefetchChunks: []uint32{req.Index},
+			RejectSenders: []string{req.Sender},
+		}
+
+	default:
+		app.logger.Error("Failed to restore snapshot", "err", err)
+		return abci.ResponseApplySnapshotChunk{Result: abci.ResponseApplySnapshotChunk_ABORT}
+	}
+}
+
 func (app *BaseApp) handleQueryGRPC(handler GRPCQueryHandler, req abci.RequestQuery) abci.ResponseQuery {
 	ctx, err := app.createQueryContext(req.Height, req.Prove)
 	if err != nil {
@@ -584,19 +705,3 @@ func splitPath(requestPath string) (path []string) {
 
 	return path
 }
-
-func (app *BaseApp) ListSnapshots(abci.RequestListSnapshots) abci.ResponseListSnapshots {
-	return abci.ResponseListSnapshots{}
-}
-
-func (app *BaseApp) OfferSnapshot(abci.RequestOfferSnapshot) abci.ResponseOfferSnapshot {
-	return abci.ResponseOfferSnapshot{}
-}
-
-func (app *BaseApp) LoadSnapshotChunk(abci.RequestLoadSnapshotChunk) abci.ResponseLoadSnapshotChunk {
-	return abci.ResponseLoadSnapshotChunk{}
-}
-
-func (app *BaseApp) ApplySnapshotChunk(abci.RequestApplySnapshotChunk) abci.ResponseApplySnapshotChunk {
-	return abci.ResponseApplySnapshotChunk{}
-}

baseapp/baseapp.go

@@ -1,6 +1,7 @@
 package baseapp
 
 import (
+	"errors"
 	"fmt"
 	"reflect"
 	"strings"
@@ -12,7 +13,9 @@ import (
 	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
 	dbm "github.com/tendermint/tm-db"
 
+	"github.com/cosmos/cosmos-sdk/snapshots"
 	"github.com/cosmos/cosmos-sdk/store"
+	"github.com/cosmos/cosmos-sdk/store/rootmulti"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
 )
@@ -60,6 +63,11 @@ type BaseApp struct { // nolint: maligned
 	idPeerFilter   sdk.PeerFilter   // filter peers by node ID
 	fauxMerkleMode bool             // if true, IAVL MountStores uses MountStoresDB for simulation speed.
 
+	// manages snapshots, i.e. dumps of app state at certain intervals
+	snapshotManager    *snapshots.Manager
+	snapshotInterval   uint64 // block interval between state sync snapshots
+	snapshotKeepRecent uint32 // recent state sync snapshots to keep
+
 	// volatile states:
 	//
 	// checkState is set on InitChain and reset on Commit
@@ -264,6 +272,20 @@ func (app *BaseApp) init() error {
 	app.setCheckState(tmproto.Header{})
 	app.Seal()
 
+	// make sure the snapshot interval is a multiple of the pruning KeepEvery interval
+	if app.snapshotManager != nil && app.snapshotInterval > 0 {
+		rms, ok := app.cms.(*rootmulti.Store)
+		if !ok {
+			return errors.New("state sync snapshots require a rootmulti store")
+		}
+		pruningOpts := rms.GetPruning()
+		if pruningOpts.KeepEvery > 0 && app.snapshotInterval%pruningOpts.KeepEvery != 0 {
+			return fmt.Errorf(
+				"state sync snapshot interval %v must be a multiple of pruning keep every interval %v",
+				app.snapshotInterval, pruningOpts.KeepEvery)
+		}
+	}
+
 	return nil
 }