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WiseDev f072c16244 make the snapshot interval settable to test the model theory
two results this round, both negative and both useful.

the account ids are right end to end, so isOwnedByBottomPlayer picks the
branch it should. and every character row carries the export names it
needs - knight, goblin and barbarian all have a filename, a blue and a
red prefix and UseAnimator set - so neither "empty prefix" nor "wrong
row" survives. Debugger::error is __noreturn, and the client does not
abort, so Character::Character is not failing to build animations
either: reached, it works.

with the checksum agreeing byte for byte, the objects in the client are
identical to ours. that leaves only the sprite never being made, or
being made and torn down again - and every push re-runs decode, which
destroys whatever it cannot match. five times a second nothing would
ever be seen. SCROLL_SNAPSHOT_INTERVAL_TICKS widens the gap so one run
can tell.
2026-08-23 16:34:07 +03:00
assets pull the arena tilemaps out of the ipa 2026-08-23 10:13:37 +03:00
config generate the daily card shop server side 2026-08-23 08:47:55 +03:00
crates make the snapshot interval settable to test the model theory 2026-08-23 16:34:07 +03:00
.gitignore nuke the tests and the dead code 2026-08-23 07:51:04 +03:00
Cargo.lock move players and accounts into postgres 2026-08-23 08:40:13 +03:00
Cargo.toml supervised mode: run the services as child processes 2026-08-23 09:46:59 +03:00
LICENSE add MIT license 2026-08-23 09:13:19 +03:00
README.md supervised mode: run the services as child processes 2026-08-23 09:46:59 +03:00

scroll-server

A server for the scroll client (Clash Royale 2.0.1306, iOS). Takes a real client from TCP connect to the lobby: login, own home data, chests, card upgrades, the shop.

Requirements

  • Rust 1.75+
  • PostgreSQL 16

Running

createdb scroll
cargo run --release -p scroll-server

Listens on 0.0.0.0:9339, the port the client hardcodes. The schema is created on first boot. DATABASE_URL defaults to postgres:///scroll.

On macOS a Homebrew cluster may need LC_ALL=C to start at all.

That runs everything in one process. For real isolation, SCROLL_MODE=supervised makes it spawn the three services as child processes and restart any that dies, with backoff:

SCROLL_MODE=supervised ./target/release/scroll-server

They can also be started by hand, in any order:

cargo run --release -p auth-service
cargo run --release -p game-service
cargo run --release -p gateway

Checking it without a phone

scroll-probe speaks the same protocol and prints the decoded lobby:

cargo run --release -p gateway --bin scroll-probe -- 127.0.0.1:9339

Flags: --claim-free-chest, --buy-chest <name>, --desync. Pass an account and pass token to reconnect as an existing player: scroll-probe 127.0.0.1:9339 0 1 <passtoken>.

Pointing a client at it

The client hardcodes game.clashroyaleapp.com. Patch that string in the binary inside the ipa to your machine's address, keeping the 23 byte slot NUL padded so nothing around it moves.

Configuration

variable default
DATABASE_URL postgres:///scroll
SCROLL_MODE single, or supervised
SCROLL_BIN_DIR next to the running binary
SCROLL_AUTH_LISTEN 127.0.0.1:9401
SCROLL_GAME_LISTEN 127.0.0.1:9402
SCROLL_GATEWAY_LISTEN 0.0.0.0:9339
SCROLL_CSV_ROOT assets
SCROLL_SHOP config/shop.json
SCROLL_STARTER_PROFILE built in
RUST_LOG info

Shop

config/shop.json lists what the server sells, as Name#count:

{
  "offers": [
    { "id": 1, "give": "Gold#1000" },
    { "id": 5, "give": "chest:Gold#1" },
    { "id": 7, "give": "Diamonds#500", "cost": "Gold#20000" }
  ]
}

Names resolve against the csv tables. cost is optional; without it the server charges the same price the client computes from the game data.