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9d125f4d19
`server_definitions` sourced each amendment's `enabled` straight from the
on-ledger Amendments object, so amendments force-activated via the
`[features]` config stanza (live in the Rules / tx processing, but never
voted on-ledger) were reported as not-enabled. That makes the output
misleading on any node that uses `[features]` (notably testnets).
Split per-amendment activation into its two real sources and make
`enabled` reflect what the server actually applies:
enabled = ledger_enabled || cfg_forced
ledger_enabled = recorded in the on-ledger Amendments object (canonical)
cfg_forced = forced via the [features] config stanza (node-local)
Additive JSON fields. Adds jss::ledger_enabled, jss::cfg_forced and a
ServerDefinitions test covering the config-forced case.
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 therippledcodebase.- 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.