Struct SaveCtx 

pub struct SaveCtx<'a> {
    pub actor: Option<&'a str>,
    pub expect_version: Option<&'a str>,
}

Who is writing, and what they believe the vault currently is.

A struct rather than two positional Option<&str> arguments: silently swapping an actor id for a version hash would disable the concurrency check while still compiling and still passing tests.

Fields

actor: Option<&'a str>

User id responsible for the change, recorded in the audit log. None for contexts where the owner is implicit.

expect_version: Option<&'a str>

The version the caller last read. When set, the write is refused unless the stored vault is still at that version. None writes unconditionally — only correct when nothing else can be writing.

Trait Implementations

impl<'a> Clone for SaveCtx<'a>

fn clone(&self) -> SaveCtx<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Copy for SaveCtx<'a>

impl<'a> Debug for SaveCtx<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> Default for SaveCtx<'a>

fn default() -> SaveCtx<'a>

Returns the “default value” for a type.