remove cosmos sdk dependency

go.mod

@@ -9,7 +9,6 @@ require (
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d
 	github.com/cespare/cp v1.1.1
-	github.com/cosmos/cosmos-sdk v0.37.1
 	github.com/davecgh/go-spew v1.1.1
 	github.com/deckarep/golang-set v1.7.1
 	github.com/edsrzf/mmap-go v1.0.0 // indirect

staking/types/decimal.go

@@ -161,8 +161,7 @@ func NewDecFromStr(str string) (d Dec, err error) {
 	}
 
 	if lenDecs > Precision {
-		return d, errors.New(
-			fmt.Sprintf("too much precision, maximum %v, len decimal %v", Precision, lenDecs))
+		return d, fmt.Errorf("too much precision, maximum %v, len decimal %v", Precision, lenDecs)
 	}
 
 	// add some extra zero's to correct to the Precision factor
@@ -172,7 +171,7 @@ func NewDecFromStr(str string) (d Dec, err error) {
 
 	combined, ok := new(big.Int).SetString(combinedStr, 10) // base 10
 	if !ok {
-		return d, errors.New(fmt.Sprintf("bad string to integer conversion, combinedStr: %v", combinedStr))
+		return d, fmt.Errorf("bad string to integer conversion, combinedStr: %v", combinedStr)
 	}
 	if neg {
 		combined = new(big.Int).Neg(combined)

staking/types/decimal_test.go

@@ -7,8 +7,6 @@ import (
 	"github.com/stretchr/testify/assert"
 
 	"github.com/stretchr/testify/require"
-
-	"github.com/cosmos/cosmos-sdk/codec"
 )
 
 // create a decimal from a decimal string (ex. "1234.5678")
@@ -267,8 +265,6 @@ func TestTruncate(t *testing.T) {
 	}
 }
 
-var cdc = codec.New()
-
 func TestDecMarshalJSON(t *testing.T) {
 	decimal := func(i int64) Dec {
 		d := NewDec(0)
@@ -307,14 +303,6 @@ func TestDecMarshalJSON(t *testing.T) {
 	}
 }
 
-func TestZeroDeserializationJSON(t *testing.T) {
-	d := Dec{new(big.Int)}
-	err := cdc.UnmarshalJSON([]byte(`"0"`), &d)
-	require.Nil(t, err)
-	err = cdc.UnmarshalJSON([]byte(`"{}"`), &d)
-	require.NotNil(t, err)
-}
-
 func TestSerializationText(t *testing.T) {
 	d := mustNewDecFromStr(t, "0.333")
 
@@ -327,51 +315,12 @@ func TestSerializationText(t *testing.T) {
 	require.True(t, d.Equal(d2), "original: %v, unmarshalled: %v", d, d2)
 }
 
-func TestSerializationGocodecJSON(t *testing.T) {
-	d := mustNewDecFromStr(t, "0.333")
-
-	bz, err := cdc.MarshalJSON(d)
-	require.NoError(t, err)
-
-	d2 := Dec{new(big.Int)}
-	err = cdc.UnmarshalJSON(bz, &d2)
-	require.NoError(t, err)
-	require.True(t, d.Equal(d2), "original: %v, unmarshalled: %v", d, d2)
-}
-
-func TestSerializationGocodecBinary(t *testing.T) {
-	d := mustNewDecFromStr(t, "0.333")
-
-	bz, err := cdc.MarshalBinaryLengthPrefixed(d)
-	require.NoError(t, err)
-
-	var d2 Dec
-	err = cdc.UnmarshalBinaryLengthPrefixed(bz, &d2)
-	require.NoError(t, err)
-	require.True(t, d.Equal(d2), "original: %v, unmarshalled: %v", d, d2)
-}
-
 type testDEmbedStruct struct {
 	Field1 string `json:"f1"`
 	Field2 int    `json:"f2"`
 	Field3 Dec    `json:"f3"`
 }
 
-// TODO make work for UnmarshalJSON
-func TestEmbeddedStructSerializationGocodec(t *testing.T) {
-	obj := testDEmbedStruct{"foo", 10, NewDecWithPrec(1, 3)}
-	bz, err := cdc.MarshalBinaryLengthPrefixed(obj)
-	require.Nil(t, err)
-
-	var obj2 testDEmbedStruct
-	err = cdc.UnmarshalBinaryLengthPrefixed(bz, &obj2)
-	require.Nil(t, err)
-
-	require.Equal(t, obj.Field1, obj2.Field1)
-	require.Equal(t, obj.Field2, obj2.Field2)
-	require.True(t, obj.Field3.Equal(obj2.Field3), "original: %v, unmarshalled: %v", obj, obj2)
-}
-
 func TestStringOverflow(t *testing.T) {
 	// two random 64 bit primes
 	dec1, err := NewDecFromStr("51643150036226787134389711697696177267")

staking/types/validator.go

@@ -1,9 +1,10 @@
 package types
 
 import (
+	"math/big"
+
 	"github.com/harmony-one/bls/ffi/go/bls"
 	"github.com/harmony-one/harmony/internal/common"
-	"math/big"
 )
 
 // Validator - data fields for a validator