This change enforces a maximum length of 63 characters on feature names, as well as not permitting an exactly 32 character long feature name to avoid confusion with those that use a `uint256` hex representation, as that is an alternative way to specify a feature. This change further prevents the use of Unicode characters in feature names, because some can be confused with regular ASCII characters despite being valid in identifiers.
Subscribe tests have a problem that there is no way to synchronize application running in background threads and test threads. Threads are communicating via websocket messages. When the code is compiled in debug mode with code coverage enabled it executes quite slow, so receiving websocket messages by the client in subscribe tests may time out.
This change does 2 things to fix the problem:
* Increases timeout for receiving a websocket message.
* Decreases the number of tests running in parallel.
While testing the fix for subscribe test another flaky test in ledger replay was found, which has also been addressed.
This change reorganizes the `tx/transactors` directory for consistency and discoverability. There are no behavioral changes, this is a pure refactor. Underscores were chosen as the way to separate multi-words as this is the more popular option in C++ projects.
Specific changes:
- Rename all subdirectories to lowercase/snake_case (`AMM` → `amm`, `Check` → `check`, `NFT` → `nft`, `PermissionedDomain` → `permissioned_domain`, etc.)
- Merge `AMM/` and `Offer/` into `dex/`, including `PermissionedDEXHelpers`
- Rename `MPT/` → `token/`, absorbing `SetTrust` and `Clawback`
- Move top-level transactors into named groups: `account/`, `bridge/`, `credentials/`, `did/`, `escrow/`, `oracle/`, `payment/`, `payment_channel/`, `system/`
- Update all include paths across the codebase and `transactions.macro`
When `gateway_balances` gets called on an account that is involved in the `EscrowCreate` transaction (with MPT being escrowed), the method returns internal error. This change fixes this case by excluding the MPT type when totaling escrow amount.
The `Subscribe` tests were flaky, because each test performs some operations (e.g. sends transactions) and waits for messages to appear in subscription with a 100ms timeout. If tests are slow (e.g. compiled in debug mode or a slow machine) then some of them could fail. This change adds an attempt to synchronize the background Env's thread and the test's thread by ensuring that all the scheduled operations are started before the test's thread starts to wait for a websocket message. This is done by limiting I/O threads of the app inside Env to 1 and adding a synchronization barrier after closing the ledger.
