2019-08-29 14:46:54 -07:00
|
|
|
//! Zebrad Abscissa Application
|
|
|
|
|
2020-08-06 10:29:31 -07:00
|
|
|
use crate::{commands::ZebradCmd, components::tracing::Tracing, config::ZebradConfig};
|
2019-08-29 14:46:54 -07:00
|
|
|
use abscissa_core::{
|
2019-12-20 11:20:04 -08:00
|
|
|
application::{self, AppCell},
|
2020-06-04 19:34:06 -07:00
|
|
|
config,
|
2020-08-05 16:35:56 -07:00
|
|
|
config::Configurable,
|
2020-06-04 19:34:06 -07:00
|
|
|
terminal::component::Terminal,
|
2020-08-05 16:35:56 -07:00
|
|
|
Application, Component, EntryPoint, FrameworkError, Shutdown, StandardPaths,
|
2019-08-29 14:46:54 -07:00
|
|
|
};
|
2020-08-05 16:35:56 -07:00
|
|
|
use application::fatal_error;
|
2020-08-06 10:29:31 -07:00
|
|
|
use std::process;
|
2019-08-29 14:46:54 -07:00
|
|
|
|
2019-12-20 11:20:04 -08:00
|
|
|
/// Application state
|
|
|
|
pub static APPLICATION: AppCell<ZebradApp> = AppCell::new();
|
2019-08-29 14:46:54 -07:00
|
|
|
|
|
|
|
/// Obtain a read-only (multi-reader) lock on the application state.
|
|
|
|
///
|
|
|
|
/// Panics if the application state has not been initialized.
|
|
|
|
pub fn app_reader() -> application::lock::Reader<ZebradApp> {
|
|
|
|
APPLICATION.read()
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Obtain an exclusive mutable lock on the application state.
|
|
|
|
pub fn app_writer() -> application::lock::Writer<ZebradApp> {
|
|
|
|
APPLICATION.write()
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Obtain a read-only (multi-reader) lock on the application configuration.
|
|
|
|
///
|
|
|
|
/// Panics if the application configuration has not been loaded.
|
|
|
|
pub fn app_config() -> config::Reader<ZebradApp> {
|
|
|
|
config::Reader::new(&APPLICATION)
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Zebrad Application
|
2020-08-06 10:29:31 -07:00
|
|
|
#[derive(Debug)]
|
2019-08-29 14:46:54 -07:00
|
|
|
pub struct ZebradApp {
|
|
|
|
/// Application configuration.
|
|
|
|
config: Option<ZebradConfig>,
|
|
|
|
|
|
|
|
/// Application state.
|
|
|
|
state: application::State<Self>,
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Initialize a new application instance.
|
|
|
|
///
|
|
|
|
/// By default no configuration is loaded, and the framework state is
|
|
|
|
/// initialized to a default, empty state (no components, threads, etc).
|
|
|
|
impl Default for ZebradApp {
|
|
|
|
fn default() -> Self {
|
|
|
|
Self {
|
|
|
|
config: None,
|
|
|
|
state: application::State::default(),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl Application for ZebradApp {
|
|
|
|
/// Entrypoint command for this application.
|
|
|
|
type Cmd = EntryPoint<ZebradCmd>;
|
|
|
|
|
|
|
|
/// Application configuration.
|
|
|
|
type Cfg = ZebradConfig;
|
|
|
|
|
|
|
|
/// Paths to resources within the application.
|
|
|
|
type Paths = StandardPaths;
|
|
|
|
|
|
|
|
/// Accessor for application configuration.
|
|
|
|
fn config(&self) -> &ZebradConfig {
|
|
|
|
self.config.as_ref().expect("config not loaded")
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Borrow the application state immutably.
|
|
|
|
fn state(&self) -> &application::State<Self> {
|
|
|
|
&self.state
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Borrow the application state mutably.
|
|
|
|
fn state_mut(&mut self) -> &mut application::State<Self> {
|
|
|
|
&mut self.state
|
|
|
|
}
|
|
|
|
|
2020-07-14 23:16:07 -07:00
|
|
|
/// Returns the framework components used by this application.
|
2020-06-04 19:34:06 -07:00
|
|
|
fn framework_components(
|
|
|
|
&mut self,
|
|
|
|
command: &Self::Cmd,
|
|
|
|
) -> Result<Vec<Box<dyn Component<Self>>>, FrameworkError> {
|
2020-07-31 23:15:26 -07:00
|
|
|
let terminal = Terminal::new(self.term_colors(command));
|
|
|
|
// This MUST happen after `Terminal::new` to ensure our preferred panic
|
|
|
|
// handler is the last one installed
|
2020-06-22 15:36:23 -07:00
|
|
|
color_eyre::install().unwrap();
|
2020-06-04 19:34:06 -07:00
|
|
|
|
2020-08-06 10:29:31 -07:00
|
|
|
Ok(vec![Box::new(terminal)])
|
2020-06-04 19:34:06 -07:00
|
|
|
}
|
|
|
|
|
2019-08-29 14:46:54 -07:00
|
|
|
/// Register all components used by this application.
|
|
|
|
///
|
|
|
|
/// If you would like to add additional components to your application
|
|
|
|
/// beyond the default ones provided by the framework, this is the place
|
|
|
|
/// to do so.
|
|
|
|
fn register_components(&mut self, command: &Self::Cmd) -> Result<(), FrameworkError> {
|
2020-02-14 13:38:33 -08:00
|
|
|
use crate::components::{
|
|
|
|
metrics::MetricsEndpoint, tokio::TokioComponent, tracing::TracingEndpoint,
|
|
|
|
};
|
2019-09-09 13:05:42 -07:00
|
|
|
|
|
|
|
let mut components = self.framework_components(command)?;
|
2020-08-06 10:29:31 -07:00
|
|
|
|
|
|
|
let cfg_ref = self
|
|
|
|
.config
|
|
|
|
.as_ref()
|
|
|
|
.expect("config is loaded before register_components");
|
|
|
|
|
|
|
|
let default_filter = if command.verbose { "info" } else { "warn" };
|
|
|
|
let is_server = command
|
|
|
|
.command
|
|
|
|
.as_ref()
|
|
|
|
.map(ZebradCmd::is_server)
|
|
|
|
.unwrap_or(false);
|
|
|
|
|
2020-07-16 00:04:42 -07:00
|
|
|
// Launch network endpoints for long-running commands
|
2020-08-06 10:29:31 -07:00
|
|
|
if is_server {
|
|
|
|
let filter = cfg_ref.tracing.filter.as_deref().unwrap_or(default_filter);
|
|
|
|
let flame_root = cfg_ref.tracing.flamegraph.as_deref();
|
|
|
|
components.push(Box::new(Tracing::new(filter, flame_root)?));
|
2020-07-16 14:39:10 -07:00
|
|
|
components.push(Box::new(TokioComponent::new()?));
|
2020-08-06 10:29:31 -07:00
|
|
|
components.push(Box::new(TracingEndpoint::new(cfg_ref)?));
|
|
|
|
components.push(Box::new(MetricsEndpoint::new(cfg_ref)?));
|
|
|
|
} else {
|
|
|
|
components.push(Box::new(Tracing::new(default_filter, None)?));
|
2020-07-16 00:04:42 -07:00
|
|
|
}
|
2019-09-09 13:05:42 -07:00
|
|
|
|
2019-08-29 14:46:54 -07:00
|
|
|
self.state.components.register(components)
|
|
|
|
}
|
|
|
|
|
2020-08-05 16:35:56 -07:00
|
|
|
/// Load this application's configuration and initialize its components.
|
|
|
|
fn init(&mut self, command: &Self::Cmd) -> Result<(), FrameworkError> {
|
|
|
|
// Load configuration
|
|
|
|
let config = command
|
|
|
|
.config_path()
|
|
|
|
.map(|path| self.load_config(&path))
|
|
|
|
.transpose()?
|
|
|
|
.unwrap_or_default();
|
|
|
|
|
|
|
|
let config = command.process_config(config)?;
|
|
|
|
self.config = Some(config);
|
|
|
|
|
|
|
|
// Create and register components with the application.
|
|
|
|
// We do this first to calculate a proper dependency ordering before
|
|
|
|
// application configuration is processed
|
|
|
|
self.register_components(command)?;
|
|
|
|
|
|
|
|
let config = self.config.take().unwrap();
|
|
|
|
|
|
|
|
// Fire callback regardless of whether any config was loaded to
|
|
|
|
// in order to signal state in the application lifecycle
|
2020-08-06 10:29:31 -07:00
|
|
|
self.after_config(config)?;
|
2020-08-05 16:35:56 -07:00
|
|
|
|
|
|
|
Ok(())
|
|
|
|
}
|
|
|
|
|
2019-08-29 14:46:54 -07:00
|
|
|
/// Post-configuration lifecycle callback.
|
|
|
|
///
|
|
|
|
/// Called regardless of whether config is loaded to indicate this is the
|
|
|
|
/// time in app lifecycle when configuration would be loaded if
|
|
|
|
/// possible.
|
2020-08-06 10:29:31 -07:00
|
|
|
fn after_config(&mut self, config: Self::Cfg) -> Result<(), FrameworkError> {
|
2019-08-29 14:46:54 -07:00
|
|
|
// Configure components
|
|
|
|
self.state.components.after_config(&config)?;
|
|
|
|
self.config = Some(config);
|
2020-06-04 19:34:06 -07:00
|
|
|
|
2019-08-29 14:46:54 -07:00
|
|
|
Ok(())
|
|
|
|
}
|
2020-08-05 16:35:56 -07:00
|
|
|
|
|
|
|
fn shutdown(&mut self, shutdown: Shutdown) -> ! {
|
|
|
|
if let Err(e) = self.state().components.shutdown(self, shutdown) {
|
|
|
|
fatal_error(self, &e)
|
|
|
|
}
|
|
|
|
|
|
|
|
// Swap out a fake app so we can trigger the destructor on the original
|
|
|
|
let _ = std::mem::take(self);
|
|
|
|
|
|
|
|
match shutdown {
|
|
|
|
Shutdown::Graceful => process::exit(0),
|
|
|
|
Shutdown::Forced => process::exit(1),
|
|
|
|
Shutdown::Crash => process::exit(2),
|
|
|
|
}
|
|
|
|
}
|
2020-06-04 19:34:06 -07:00
|
|
|
}
|