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rpc: return ABCI state's latest block number (#331)

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* return abci state's latest block number in rpc

Closes #318

* Update ethereum/rpc/backend/backend.go

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* add comments

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>
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yihuang 2021-07-22 23:06:44 +08:00 committed by GitHub
parent d54663c0b8
commit 3f136bf5d6
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1 changed files with 22 additions and 5 deletions
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27
ethereum/rpc/backend/backend.go
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@ -5,8 +5,10 @@ import (
"fmt"
"math/big"
"regexp"
"strconv"
"github.com/tharsis/ethermint/ethereum/rpc/types"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
"github.com/pkg/errors"
"github.com/tendermint/tendermint/libs/log"
@ -14,10 +16,12 @@ import (
"github.com/cosmos/cosmos-sdk/client"
sdk "github.com/cosmos/cosmos-sdk/types"
grpctypes "github.com/cosmos/cosmos-sdk/types/grpc"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
ethtypes "github.com/ethereum/go-ethereum/core/types"
"github.com/tharsis/ethermint/ethereum/rpc/types"
ethermint "github.com/tharsis/ethermint/types"
evmtypes "github.com/tharsis/ethermint/x/evm/types"
)
@ -69,15 +73,28 @@ func NewEVMBackend(logger log.Logger, clientCtx client.Context) *EVMBackend {
}
}
// BlockNumber returns the current block number.
// BlockNumber returns the current block number in abci app state.
// Because abci app state could lag behind from tendermint latest block, it's more stable
// for the client to use the latest block number in abci app state than tendermint rpc.
func (e *EVMBackend) BlockNumber() (hexutil.Uint64, error) {
// NOTE: using 0 as min and max height returns the blockchain info up to the latest block.
info, err := e.clientCtx.Client.BlockchainInfo(e.ctx, 0, 0)
// do any grpc query, ignore the response and use the returned block height
var header metadata.MD
_, err := e.queryClient.Params(e.ctx, &evmtypes.QueryParamsRequest{}, grpc.Header(&header))
if err != nil {
return hexutil.Uint64(0), err
}
return hexutil.Uint64(info.LastHeight), nil
blockHeightHeader := header.Get(grpctypes.GRPCBlockHeightHeader)
if headerLen := len(blockHeightHeader); headerLen != 1 {
return 0, fmt.Errorf("unexpected '%s' gRPC header length; got %d, expected: %d", grpctypes.GRPCBlockHeightHeader, headerLen, 1)
}
height, err := strconv.ParseUint(blockHeightHeader[0], 10, 64)
if err != nil {
return 0, fmt.Errorf("failed to parse block height: %w", err)
}
return hexutil.Uint64(height), nil
}
// GetBlockByNumber returns the block identified by number.