Add state sync support (cosmos#7166)

* Add state sync support

* fix incorrect test tempdir

* proto: move and update Protobuf schemas

* proto: lint fixes

* comment tweaks

* don't use type aliasing

* don't call .Error() when logging errors

* use create terminology instead of take for snapshots

* reuse chunk hasher

* simplify key encoding code

* track chunk index in Manager

* add restoreDone message for Manager

* add a ready channel to Snapshotter.Restore()

* add comment on streaming IO API

* use sdkerrors for error handling

* fix incorrect error

* tweak changelog

* syntax fix

* update test code after merge

simd/cmd/root.go

@@ -4,9 +4,11 @@ import (
 	"context"
 	"io"
 	"os"
+	"path/filepath"
 
 	"github.com/cosmos/cosmos-sdk/codec"
 	"github.com/cosmos/cosmos-sdk/simapp/params"
+	"github.com/cosmos/cosmos-sdk/snapshots"
 
 	"github.com/spf13/cast"
 	"github.com/spf13/cobra"
@@ -173,6 +175,16 @@ func newApp(logger log.Logger, db dbm.DB, traceStore io.Writer, appOpts serverty
 		panic(err)
 	}
 
+	snapshotDir := filepath.Join(cast.ToString(appOpts.Get(flags.FlagHome)), "data", "snapshots")
+	snapshotDB, err := sdk.NewLevelDB("metadata", snapshotDir)
+	if err != nil {
+		panic(err)
+	}
+	snapshotStore, err := snapshots.NewStore(snapshotDB, snapshotDir)
+	if err != nil {
+		panic(err)
+	}
+
 	return simapp.NewSimApp(
 		logger, db, traceStore, true, skipUpgradeHeights,
 		cast.ToString(appOpts.Get(flags.FlagHome)),
@@ -185,6 +197,9 @@ func newApp(logger log.Logger, db dbm.DB, traceStore io.Writer, appOpts serverty
 		baseapp.SetInterBlockCache(cache),
 		baseapp.SetTrace(cast.ToBool(appOpts.Get(server.FlagTrace))),
 		baseapp.SetIndexEvents(cast.ToStringSlice(appOpts.Get(server.FlagIndexEvents))),
+		baseapp.SetSnapshotStore(snapshotStore),
+		baseapp.SetSnapshotInterval(cast.ToUint64(appOpts.Get(server.FlagStateSyncSnapshotInterval))),
+		baseapp.SetSnapshotKeepRecent(cast.ToUint32(appOpts.Get(server.FlagStateSyncSnapshotKeepRecent))),
 	)
 }