Struct HostFnRegistry 

pub struct HostFnRegistry { /* private fields */ }

Registry of host functions available to Extism plugins.

The host populates this once per uni-db instance with all gateable imports (host_fs_read, host_net_http_get, host_query_run, host_kms_sign, host_secrets_acquire, etc). At plugin load time, the loader filters the registry through the plugin’s granted capability set and registers only the matching host fns into the Extism plugin’s import table.

The capability check at call time is mechanical: each gated host fn looks up its HostFnSpec in the registry and verifies the plugin’s grants. Plugins that bypass the capability check (because the host author forgot) cannot exist — every host fn invocation routes through the registry’s check helper.

Status

M6a scaffolding: the public API surface is in place; the actual Function registration into Extism’s runtime arrives in the cutover.

Implementations

impl HostFnRegistry

pub fn new() -> Self

Construct a fresh, empty registry.

pub fn register(&mut self, spec: HostFnSpec)

Register a host fn spec.

pub fn get(&self, name: &str) -> Option<&HostFnSpec>

Look up a registered spec by name.

pub fn iter(&self) -> impl Iterator<Item = &HostFnSpec>

Iterate all registered specs.

pub fn len(&self) -> usize

Number of registered host fns.

pub fn is_empty(&self) -> bool

Returns true if no host fns are registered.

Trait Implementations

impl Debug for HostFnRegistry

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

Formats the value using the given formatter.

impl Default for HostFnRegistry

fn default() -> HostFnRegistry

Returns the “default value” for a type.