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62d8d84a49
Add `GasLimit`, `BytecodeSizeLimit`, and `GasPrice` to the network's votable fee settings, gated on `featureSmartEscrow`. The `.macro` and autogen plumbing for these fields landed in #8157; this adds the behavior behind them: config parsing, fee voting, the `SetFee` pseudo- transaction, `FeeSettings` genesis and load, and the RPC surfaces that report fee settings. `detail::VotableValue` in FeeVoteImpl.cpp becomes a template, since the three new settings are `std::uint32_t` rather than `XRPAmount`. `ServiceRegistry::getFees()` exposes the configured settings to code that has no `ReadView`. It has no production caller yet; the Smart Escrow transactors call it from `preflight`.
protocol
Classes and functions for handling data and values associated with the XRP Ledger protocol.
Serialized Objects
Objects transmitted over the network must be serialized into a canonical format. The prefix "ST" refers to classes that deal with the serialized format.
The term "Tx" or "tx" is an abbreviation for "Transaction", a commonly occurring object type.
Optional Fields
Our serialized fields have some "type magic" to make optional fields easier to read:
- The operation
x[sfFoo]means "return the value of 'Foo' if it exists, or the default value if it doesn't." - The operation
x[~sfFoo]means "return the value of 'Foo' if it exists, or nothing if it doesn't." This usage of the tilde/bitwise NOT operator is not standard outside of thexrpldcodebase.- As a consequence of this,
x[~sfFoo] = y[~sfFoo]assigns the value of Foo from y to x, including omitting Foo from x if it doesn't exist in y.
- As a consequence of this,
Typically, for things that are guaranteed to exist, you use
x[sfFoo] and avoid having to deal with a container that may
or may not hold a value. For things not guaranteed to exist,
you use x[~sfFoo] because you want such a container. It
avoids having to look something up twice, once just to see if
it exists and a second time to get/set its value.
(Real example)
The source of this "type magic" is in SField.h.