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CfgMgrInner

arti::reload_cfg

Struct CfgMgrInner 

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struct CfgMgrInner {
    modules: Vec<Weak<dyn ReconfigurableModule>>,
    watcher: Option<FileWatcher>,
    loaded_cfg: ConfigurationTree,
    additional_cfg: ConfigSettings,
    normalized_cfg: ConfigurationTree,
    unrecognized_keys: HashSet<DisfavouredKey>,
    deprecated_keys: HashSet<DisfavouredKey>,
}
Expand description

Mutable part of a CfgMgr.

§RPC Dataflow

We keep a fair amount of state for our configuration, especially when we are supporting RPC. A few important pieces are, in dataflow order:

  1. sources: A set of ConfigurationSources telling us where to load our configuration from.
  2. loaded_cfg: A ConfigurationTree that we have loaded from our sources. This is the most recent tree that we were able to successfully decode and apply. (RPC only)
  3. additional_cfg: A set of rpc::ConfigSettings provided by an RPC superuser app, to override options in loaded_cfg. (RPC only)
  4. normalized_cfg: A ConfigurationTree produced by combining loaded_cfgandadditional_cfg`, and filling any missing defaults.

When we are reloading our configuration from disk, we use sources to load and parse a new ConfigurationTree, then we apply additional_cfg to it, and then we see whether that configuration can successfully be resolved and used to reconfigure the modules in Arti. On success, we replace loaded_cfg and normalized_cfg,

When we are changing our configuration via RPC, we try to change additional_cfg, apply it to loaded_cfg, and then we see whether that configuration can successfully be resolved and used to reconfigure the modules in Arti. On success, we replace normalized_cfg and additional_cfg.

Fields§

§modules: Vec<Weak<dyn ReconfigurableModule>>

A list of modules to alert whenever the configuration has changed.

§watcher: Option<FileWatcher>

If present, a FileWatcher that is currently watching for changes in the configuration files and directories.

§loaded_cfg: ConfigurationTree

RPC only: The most recent configuration tree as loaded. We use this to apply additional_cfg repeatedly without reloading all the files every time RPC tells us to change something.

§additional_cfg: ConfigSettings

RPC only: A set of RPC-provided options to apply to the configuration before decoding it.

§normalized_cfg: ConfigurationTree

RPC only: a fully populated, normalized configuration tree, based on the most recent time that we called CfgMgr::reload_configuration.

§unrecognized_keys: HashSet<DisfavouredKey>

RPC only: a set of unrecognized options from the configuration.

§deprecated_keys: HashSet<DisfavouredKey>

RPC only: a set of deprecated options from the configuration

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impl Default for CfgMgrInner

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