Replace uses of libs/json with encoding/json. (#7534)

Where possible, replace uses of the custom JSON library with the standard
library. The custom library treats interface and unnamed lteral types
differently, so this change avoids those even where it would probably be safe
to switch them.

internal/consensus/peer_state.go

@@ -23,8 +23,8 @@ var (
 
 // peerStateStats holds internal statistics for a peer.
 type peerStateStats struct {
-	Votes      int `json:"votes"`
-	BlockParts int `json:"block_parts"`
+	Votes      int `json:"votes,string"`
+	BlockParts int `json:"block_parts,string"`
 }
 
 func (pss peerStateStats) String() string {

internal/consensus/state.go

@@ -3,6 +3,7 @@ package consensus
 import (
 	"bytes"
 	"context"
+	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -20,7 +21,6 @@ import (
 	"github.com/tendermint/tendermint/internal/libs/fail"
 	sm "github.com/tendermint/tendermint/internal/state"
 	tmevents "github.com/tendermint/tendermint/libs/events"
-	tmjson "github.com/tendermint/tendermint/libs/json"
 	"github.com/tendermint/tendermint/libs/log"
 	tmmath "github.com/tendermint/tendermint/libs/math"
 	tmos "github.com/tendermint/tendermint/libs/os"
@@ -253,14 +253,14 @@ func (cs *State) GetRoundState() *cstypes.RoundState {
 func (cs *State) GetRoundStateJSON() ([]byte, error) {
 	cs.mtx.RLock()
 	defer cs.mtx.RUnlock()
-	return tmjson.Marshal(cs.RoundState)
+	return json.Marshal(cs.RoundState)
 }
 
 // GetRoundStateSimpleJSON returns a json of RoundStateSimple
 func (cs *State) GetRoundStateSimpleJSON() ([]byte, error) {
 	cs.mtx.RLock()
 	defer cs.mtx.RUnlock()
-	return tmjson.Marshal(cs.RoundState.RoundStateSimple())
+	return json.Marshal(cs.RoundState.RoundStateSimple())
 }
 
 // GetValidators returns a copy of the current validators.

internal/consensus/types/height_vote_set.go

@@ -1,12 +1,12 @@
 package types
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"strings"
 	"sync"
 
-	tmjson "github.com/tendermint/tendermint/libs/json"
 	tmmath "github.com/tendermint/tendermint/libs/math"
 	tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
 	"github.com/tendermint/tendermint/types"
@@ -237,7 +237,7 @@ func (hvs *HeightVoteSet) StringIndented(indent string) string {
 func (hvs *HeightVoteSet) MarshalJSON() ([]byte, error) {
 	hvs.mtx.Lock()
 	defer hvs.mtx.Unlock()
-	return tmjson.Marshal(hvs.toAllRoundVotes())
+	return json.Marshal(hvs.toAllRoundVotes())
 }
 
 func (hvs *HeightVoteSet) toAllRoundVotes() []roundVotes {

internal/consensus/types/peer_round_state.go

@@ -13,9 +13,9 @@ import (
 // PeerRoundState contains the known state of a peer.
 // NOTE: Read-only when returned by PeerState.GetRoundState().
 type PeerRoundState struct {
-	Height int64         `json:"height"` // Height peer is at
-	Round  int32         `json:"round"`  // Round peer is at, -1 if unknown.
-	Step   RoundStepType `json:"step"`   // Step peer is at
+	Height int64         `json:"height,string"` // Height peer is at
+	Round  int32         `json:"round"`         // Round peer is at, -1 if unknown.
+	Step   RoundStepType `json:"step"`          // Step peer is at
 
 	// Estimated start of round 0 at this height
 	StartTime time.Time `json:"start_time"`