Expect bank/balances use latest height when height param not specified

[whunmr]

Summary of Bug

When height param not specified, do not using the latest height in REST API bank/balances
and returns error.

related with #4891

BJ00609:~$ curl http://localhost:1317/bank/balances/cosmos1w06eekstpe4njyrvx94ehal7yttcs5lm06a0sl?height=0
{"error":"cannot query with proof when height \u003c= 1; please provide a valid height"}
BJ00609:~$ curl http://localhost:1317/bank/balances/cosmos1w06eekstpe4njyrvx94ehal7yttcs5lm06a0sl?height=1
{"error":"cannot query with proof when height \u003c= 1; please provide a valid height"}
BJ00609:~$ curl http://localhost:1317/bank/balances/cosmos1w06eekstpe4njyrvx94ehal7yttcs5lm06a0sl
{"error":"cannot query with proof when height \u003c= 1; please provide a valid height"}
BJ00609:~$ curl http://localhost:1317/bank/balances/cosmos1w06eekstpe4njyrvx94ehal7yttcs5lm06a0sl?height=2
{"height":"2","result":[
  {
    "denom": "stake",
    "amount": "100000000"
  },
  {
    "denom": "validatortoken",
    "amount": "900000000"
  }
]}
BJ00609:~$ curl http://localhost:1317/bank/balances/cosmos1w06eekstpe4njyrvx94ehal7yttcs5lm06a0sl?height=2000
{"error":"{\"codespace\":\"sdk\",\"code\":1,\"message\":\"failed to load state at height 2000; version does not exist (latest height: 25)\"}"}

Expected behave

• when height not specified, using the latest block height

Version

gaia v1.0.0

Steps to Reproduce

• start gaiad

$ gaiad init --chain-id=testing testing
$ gaiacli keys add validator
$ gaiad add-genesis-account $(gaiacli keys show validator -a) 200000000stake,900000000validatortoken
$ gaiad gentx --name validator
$ gaiad collect-gentxs
$ gaiad start

• start rest-server with trust-node=false

gaiacli rest-server --chain-id=testing  --laddr=tcp://localhost:1317  --node tcp://localhost:26657 --trust-node=false

• curl request in Summary of Bug section

more context

when height param not specified in rest query,
ParseQueryHeightOrReturnBadRequest will set the default value as 0

func ParseQueryHeightOrReturnBadRequest(...) {
	heightStr := r.FormValue("height")
	if heightStr != "" {
...
	} else {
		cliCtx = cliCtx.WithHeight(0)
	}

---

For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned

[whunmr]

In handleQueryCustom, when height==0, the height will be assigned as app.LastBlockHeight()

func handleQueryCustom(app *BaseApp, path []string, req abci.RequestQuery) (res abci.ResponseQuery) {
	
	// when a client did not provide a query height, manually inject the latest
	if req.Height == 0 {
		req.Height = app.LastBlockHeight()
	}

But do not have similar logic in handleQueryStore which is called when we query
gaiacli query staking validator in #4891

=> 509:	func handleQueryStore(app *BaseApp, path []string, req abci.RequestQuery) abci.ResponseQuery {
(dlv) args
req = github.com/tendermint/tendermint/abci/types.RequestQuery {Data: []uint8 len: 21, cap: 48, [...], Path: "/store/staking/key", Height: 0,...+4 more}

maybe we should add similar logic (assign height to app.LastBlockHeight when height == 0) in handleQueryStore

Then maybe we can remove the height restriction in CLIContext#query

func (ctx CLIContext) query(path string, key cmn.HexBytes) (res []byte, height int64, err error) {

--	if ctx.Height <= 1 && !ctx.TrustNode {
--		return res, height, errors.New("cannot query with proof when height <= 1; please provide a valid height")
--	}

[alexanderbez]

Thanks @whunmr; the solution is quite simple. For now, just run your node with --trust-node until we release v0.36.1 with this fix.

[whunmr]

Thanks for the fix and quick response :) @alexanderbez

[alexanderbez]

Thank you!