accounts,ethclient,internal,mobile: add eth api to get mru number (et…

…hereum#250) (ethereum#251)

* accounts,ethclient,internal,mobile: add eth api to get mru number

* internal: use github.com/kevinburke/go-bindata

internal/ethapi/api.go

@@ -551,6 +551,17 @@ func (s *PublicBlockChainAPI) GetBalance(ctx context.Context, address common.Add
 	return (*hexutil.Big)(state.GetBalance(address)), state.Error()
 }
 
+// GetMRUNumber returns the most recent used blocknumber for the given address in the state of the
+// given block number. The rpc.LatestBlockNumber and rpc.PendingBlockNumber meta
+// block numbers are also allowed.
+func (s *PublicBlockChainAPI) GetMRUNumber(ctx context.Context, address common.Address, blockNr rpc.BlockNumber) (uint64, error) {
+	state, _, err := s.b.StateAndHeaderByNumber(ctx, blockNr)
+	if state == nil || err != nil {
+		return 0, err
+	}
+	return state.GetMRUNumber(address), state.Error()
+}
+
 // Result structs for GetProof
 type AccountResult struct {
 	Address      common.Address  `json:"address"`

mobile/ethclient.go

@@ -190,6 +190,17 @@ func (ec *EthereumClient) GetNonceAt(ctx *Context, account *Address, number int6
 	return int64(rawNonce), err
 }
 
+// GetMRUNumberAt returns the last recent used block number of the given account.
+// The block number can be <0, in which case the nonce is taken from the latest known block.
+func (ec *EthereumClient) GetMRUNumberAt(ctx *Context, account *Address, number int64) (nonce int64, _ error) {
+	if number < 0 {
+		rawNumber, err := ec.client.MRUNumberAt(ctx.context, account.address, nil)
+		return int64(rawNumber), err
+	}
+	rawNumber, err := ec.client.MRUNumberAt(ctx.context, account.address, big.NewInt(number))
+	return int64(rawNumber), err
+}
+
 // Filters
 
 // FilterLogs executes a filter query.