#[non_exhaustive]pub enum CacheMode {
Full,
Redacted,
Fingerprint,
}Expand description
How much of a configuration to keep on disk.
A resolved configuration holds every value, including the ones
#[config(secret)] exists to keep out of logs. There is no way to make that
not a trade-off, so it is a choice with three answers rather than a default
nobody was told about:
| Mode | On disk | Recovers |
|---|---|---|
Full | everything, secrets included | completely |
Redacted (the attribute’s default) | everything except #[config(secret)] fields | only if the secrets come from somewhere live |
Fingerprint | a hash and the key names | never — it reports what changed and still fails |
On Unix the file is written 0600. That is the most that can be done
without refusing the request.
Recovery reads no files: the files are what broke, so it loads from the cache plus the environment and the runtime layers, never from the sources whose failure caused it.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
Full
Everything, secrets included. Recovers completely.
The default, because a cache that cannot recover is a cache that will
disappoint somebody at three in the morning. The file is 0600; the
rest is documented rather than solved.
Redacted
Everything except the fields marked #[config(secret)].
Recovery then depends on those values arriving from somewhere live — the environment, usually. That is arguably the right deployment shape anyway, and useless for anyone whose secrets live in a file.
Fingerprint
A hash and the key names. No values at all.
Cannot recover, and does not pretend to: a failed start still fails. What it buys is the diagnosis — which keys have moved since the last time this worked — which is usually the first thing anyone wants.
Implementations§
Trait Implementations§
impl Copy for CacheMode
impl Eq for CacheMode
impl StructuralPartialEq for CacheMode
Auto Trait Implementations§
impl Freeze for CacheMode
impl RefUnwindSafe for CacheMode
impl Send for CacheMode
impl Sync for CacheMode
impl Unpin for CacheMode
impl UnsafeUnpin for CacheMode
impl UnwindSafe for CacheMode
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