Stuck in trader runtime loop

[conorsch]

Our preview deployment of Osiris has been stuck for a few hours:

❯ kubectl logs -f osiris-preview-654c9f844-wr4hd
Jul 21 21:35:22.952 DEBUG osiris::opt::serve: found valid trading symbols in Binance API symbols=["BTCUSD", "ATOMBTC", "ATOMUSD"]
Jul 21 21:35:23.083  INFO osiris::opt::serve: starting initial sync: please wait for sync to complete before requesting tokens
Jul 21 21:35:24.391  INFO osiris::opt::serve: initial sync complete
Jul 21 21:35:24.391 DEBUG osiris::binance_fetcher: running BinanceFetcher
^C

I'd expect to see it slinging transactions around. Discovered this while following up on #13. I believe the code is getting stuck on this line:

osiris/src/trader.rs

Line 136 in 0a7ed0e

if rx.has_changed().unwrap() {

meaning that the result always evaluates to false, so the loop continues without actually taking any action. Will add some more logging for visibility.

Steps to reproduce

1. check out main branch
2. run: RUST_LOG=osiris=trace cargo run --release -- serve --node https://grpc.testnet-preview.penumbra.zone BTC ATOM USD
3. observe that no transaction events are logged, program is stuck