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bd68364f25
Rename the existing ttEXPORT pseudo-tx to ttEXPORT_FINALIZE (type 90) to make room for a user-submittable ttEXPORT (type 91). ttEXPORT allows non-hook users to submit export transactions directly, creating the same ltEXPORTED_TXN entries that the hook xport() API creates inline. Extract shared logic into ExportLedgerOps.h: - createExportedTxn(): creates ltEXPORTED_TXN, enforces directory cap - validateNetworkID(): self-target and unconfigured guards - validateExportAccount(): account ownership check Both the hook API (HookAPI.cpp) and the Export transactor now call into ExportLedgerOps, eliminating duplicated validation and ledger mutation code.
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.