hydra_client integration — code map (Dice & Snake)¶

Direct links to where the hydra_client package is used in the demo app, for the workshop walkthrough. Repo: https://github.com/dextrlabs-dev/hydra-mobile-sdk (branch main).

One-liner: the dice/snake services build + sign a tiny L2 transaction, call HydraHttpClient.postTransaction(...), and the head confirms it back on HydraHeadFacade.messages as a typed HydraTxValid at a new seq.

The library being integrated¶

packages/hydra_client/lib/hydra_client.dart — public API surface the app imports

Dice¶

example/hydra_demo/lib/services/dice_hydra_submit.dart — build → sign → submit
L9 import 'package:hydra_client/hydra_client.dart';
L34 HydraHttpClient(config: config) → getSnapshotUtxo()
L110 http.postTransaction({...}) → submit signed L2 dice tx
example/hydra_demo/lib/dice_game_tab.dart — UI button → DiceHydraSubmit.submitDiceRoll(...)

Snake¶

example/hydra_demo/lib/services/snake_hydra_submit.dart — same shape (L9 import, L32 HydraHttpClient, L104 postTransaction)
example/hydra_demo/lib/snake_game_tab.dart — game loop → SnakeHydraSubmit.submitSnakeEvent(...) (on fruit)

Connection / live message stream (high-level facade)¶

example/hydra_demo/lib/connection_tab.dart — HydraHeadFacade(...), facade.messages.listen(...), facade.connect(...) (~L253–L297)
example/hydra_demo/lib/services/l2_tx_submit_helpers.dart — findOwnedUnspent, decodeL2TransactionResponse

Note: line anchors are exact for the services/*.dart files (unchanged on main). For connection_tab.dart / snake_game_tab.dart they may be off by a few lines — the workshop fixes (web int fix, board sizing, default :4021, hidden commit) are local and not yet pushed to main.