Migrate x/staking to Protobuf

.codecov.yml

@@ -46,6 +46,7 @@ ignore:
   - "docs"
   - "*.md"
   - "*.rst"
+  - "*.pb.go"
   - "x/**/test_common.go"
   - "scripts/"
   - "contrib"

.golangci.yml

@@ -47,7 +47,7 @@ issues:
     - text: "ST1003:"
       linters:
         - stylecheck
-    # FIXME disabled until golangci-lint updates stylecheck with this fix:
+    # FIXME: Disabled until golangci-lint updates stylecheck with this fix:
     # https://github.com/dominikh/go-tools/issues/389
     - text: "ST1016:"
       linters:

CHANGELOG.md

@@ -60,6 +60,14 @@ balances or a single balance by denom when the `denom` query parameter is presen
   * Callers to `NewBaseVestingAccount` are responsible for verifying account balance in relation to
   the original vesting amount.
   * The `SendKeeper` and `ViewKeeper` interfaces in `x/bank` have been modified to account for changes.
+* (staking) [\#5600](https://github.com/cosmos/cosmos-sdk/pull/5600) Migrate the `x/staking` module to use Protocol Buffer for state
+serialization instead of Amino. The exact codec used is `codec.HybridCodec` which utilizes Protobuf for binary encoding and Amino
+for JSON encoding.
+  * `BondStatus` is now of type `int32` instead of `byte`.
+  * Types of `int16` in the `Params` type are now of type `int32`.
+  * Every reference of `crypto.Pubkey` in context of a `Validator` is now of type string. `GetPubKeyFromBech32` must be used to get the `crypto.Pubkey`.
+  * The `Keeper` constructor now takes a `codec.Marshaler` instead of a concrete Amino codec. This exact type
+  provided is specified by `ModuleCdc`.
 
 ### Improvements
 

codec/amino.go

@@ -45,8 +45,8 @@ func RegisterEvidences(cdc *Codec) {
 // MarshalJSONIndent provides a utility for indented JSON encoding of an object
 // via an Amino codec. It returns an error if it cannot serialize or indent as
 // JSON.
-func MarshalJSONIndent(cdc *Codec, obj interface{}) ([]byte, error) {
-	bz, err := cdc.MarshalJSON(obj)
+func MarshalJSONIndent(m JSONMarshaler, obj interface{}) ([]byte, error) {
+	bz, err := m.MarshalJSON(obj)
 	if err != nil {
 		return nil, err
 	}
@@ -60,8 +60,8 @@ func MarshalJSONIndent(cdc *Codec, obj interface{}) ([]byte, error) {
 }
 
 // MustMarshalJSONIndent executes MarshalJSONIndent except it panics upon failure.
-func MustMarshalJSONIndent(cdc *Codec, obj interface{}) []byte {
-	bz, err := MarshalJSONIndent(cdc, obj)
+func MustMarshalJSONIndent(m JSONMarshaler, obj interface{}) []byte {
+	bz, err := MarshalJSONIndent(m, obj)
 	if err != nil {
 		panic(fmt.Sprintf("failed to marshal JSON: %s", err))
 	}

codec/codec.go

@@ -30,6 +30,10 @@ type (
 		UnmarshalBinaryLengthPrefixed(bz []byte, ptr ProtoMarshaler) error
 		MustUnmarshalBinaryLengthPrefixed(bz []byte, ptr ProtoMarshaler)
 
+		JSONMarshaler
+	}
+
+	JSONMarshaler interface {
 		MarshalJSON(o interface{}) ([]byte, error) // nolint: stdmethods
 		MustMarshalJSON(o interface{}) []byte
 

go.mod

@@ -9,6 +9,7 @@ require (
 	github.com/cosmos/ledger-cosmos-go v0.11.1
 	github.com/gogo/protobuf v1.3.1
 	github.com/golang/mock v1.3.1-0.20190508161146-9fa652df1129
+	github.com/golang/protobuf v1.3.2
 	github.com/gorilla/mux v1.7.3
 	github.com/hashicorp/golang-lru v0.5.4
 	github.com/mattn/go-isatty v0.0.12

simapp/app.go

@@ -16,7 +16,6 @@ import (
 	"github.com/cosmos/cosmos-sdk/version"
 	"github.com/cosmos/cosmos-sdk/x/auth"
 	"github.com/cosmos/cosmos-sdk/x/auth/ante"
-	"github.com/cosmos/cosmos-sdk/x/auth/vesting"
 	"github.com/cosmos/cosmos-sdk/x/bank"
 	"github.com/cosmos/cosmos-sdk/x/crisis"
 	distr "github.com/cosmos/cosmos-sdk/x/distribution"
@@ -79,16 +78,6 @@ var (
 	}
 )
 
-// MakeCodec - custom tx codec
-func MakeCodec() *codec.Codec {
-	var cdc = codec.New()
-	ModuleBasics.RegisterCodec(cdc)
-	vesting.RegisterCodec(cdc)
-	sdk.RegisterCodec(cdc)
-	codec.RegisterCrypto(cdc)
-	return cdc
-}
-
 // Verify app interface at compile time
 var _ App = (*SimApp)(nil)
 
@@ -135,6 +124,9 @@ func NewSimApp(
 	invCheckPeriod uint, baseAppOptions ...func(*bam.BaseApp),
 ) *SimApp {
 
+	appCodec := NewAppCodec()
+
+	// TODO: Remove cdc in favor of appCodec once all modules are migrated.
 	cdc := MakeCodec()
 
 	bApp := bam.NewBaseApp(appName, logger, db, auth.DefaultTxDecoder(cdc), baseAppOptions...)
@@ -180,7 +172,7 @@ func NewSimApp(
 		app.cdc, keys[supply.StoreKey], app.AccountKeeper, app.BankKeeper, maccPerms,
 	)
 	stakingKeeper := staking.NewKeeper(
-		app.cdc, keys[staking.StoreKey], app.BankKeeper, app.SupplyKeeper, app.subspaces[staking.ModuleName],
+		appCodec.Staking, keys[staking.StoreKey], app.BankKeeper, app.SupplyKeeper, app.subspaces[staking.ModuleName],
 	)
 	app.MintKeeper = mint.NewKeeper(
 		app.cdc, keys[mint.StoreKey], app.subspaces[mint.ModuleName], &stakingKeeper,

simapp/codec.go

@@ -0,0 +1,40 @@
+package simapp
+
+import (
+	"github.com/cosmos/cosmos-sdk/codec"
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/x/auth/vesting"
+	"github.com/cosmos/cosmos-sdk/x/staking"
+)
+
+// AppCodec defines the application-level codec. This codec contains all the
+// required module-specific codecs that are to be provided upon initialization.
+type AppCodec struct {
+	amino *codec.Codec
+
+	Staking *staking.Codec
+}
+
+func NewAppCodec() *AppCodec {
+	amino := MakeCodec()
+
+	return &AppCodec{
+		amino:   amino,
+		Staking: staking.NewCodec(amino),
+	}
+}
+
+// MakeCodec creates and returns a reference to an Amino codec that has all the
+// necessary types and interfaces registered. This codec is provided to all the
+// modules the application depends on.
+//
+// NOTE: This codec will be deprecated in favor of AppCodec once all modules are
+// migrated.
+func MakeCodec() *codec.Codec {
+	var cdc = codec.New()
+	ModuleBasics.RegisterCodec(cdc)
+	vesting.RegisterCodec(cdc)
+	sdk.RegisterCodec(cdc)
+	codec.RegisterCrypto(cdc)
+	return cdc
+}