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application.rs
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application.rs
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//! Zebrad Abscissa Application
use std::{io::Write, process};
use abscissa_core::{
application::{self, fatal_error, AppCell},
config::{self, Configurable},
terminal::{component::Terminal, stderr, stdout, ColorChoice},
Application, Component, EntryPoint, FrameworkError, Shutdown, StandardPaths, Version,
};
use zebra_network::constants::PORT_IN_USE_ERROR;
use zebra_state::constants::{DATABASE_FORMAT_VERSION, LOCK_FILE_ERROR};
use crate::{commands::ZebradCmd, components::tracing::Tracing, config::ZebradConfig};
/// Application state
pub static APPLICATION: AppCell<ZebradApp> = AppCell::new();
/// 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)
}
/// Returns the zebrad version for this build, in SemVer 2.0 format.
///
/// Includes the git commit and the number of commits since the last version
/// tag, if available.
///
/// For details, see https://semver.org/
pub fn app_version() -> Version {
const CARGO_PKG_VERSION: &str = env!("CARGO_PKG_VERSION");
let vergen_git_semver: Option<&str> = option_env!("VERGEN_GIT_SEMVER_LIGHTWEIGHT");
match vergen_git_semver {
// change the git semver format to the semver 2.0 format
Some(mut vergen_git_semver) if !vergen_git_semver.is_empty() => {
// strip the leading "v", if present
if &vergen_git_semver[0..1] == "v" {
vergen_git_semver = &vergen_git_semver[1..];
}
// split into tag, commit count, hash
let rparts: Vec<_> = vergen_git_semver.rsplitn(3, '-').collect();
match rparts.as_slice() {
// assume it's a cargo package version or a git tag with no hash
[_] | [_, _] => vergen_git_semver.parse().unwrap_or_else(|_| {
panic!(
"VERGEN_GIT_SEMVER without a hash {:?} must be valid semver 2.0",
vergen_git_semver
)
}),
// it's the "git semver" format, which doesn't quite match SemVer 2.0
[hash, commit_count, tag] => {
let semver_fix = format!("{}+{}.{}", tag, commit_count, hash);
semver_fix.parse().unwrap_or_else(|_|
panic!("Modified VERGEN_GIT_SEMVER {:?} -> {:?} -> {:?} must be valid. Note: CARGO_PKG_VERSION was {:?}.",
vergen_git_semver,
rparts,
semver_fix,
CARGO_PKG_VERSION))
}
_ => unreachable!("split is limited to 3 parts"),
}
}
_ => CARGO_PKG_VERSION.parse().unwrap_or_else(|_| {
panic!(
"CARGO_PKG_VERSION {:?} must be valid semver 2.0",
CARGO_PKG_VERSION
)
}),
}
}
/// Zebrad Application
#[derive(Debug)]
pub struct ZebradApp {
/// Application configuration.
config: Option<ZebradConfig>,
/// Application state.
state: application::State<Self>,
}
impl ZebradApp {
/// Are standard output and standard error both connected to ttys?
fn outputs_are_ttys() -> bool {
atty::is(atty::Stream::Stdout) && atty::is(atty::Stream::Stderr)
}
/// Returns the git commit for this build, if available.
///
///
/// # Accuracy
///
/// If the user makes changes, but does not commit them, the git commit will
/// not match the compiled source code.
pub fn git_commit() -> Option<&'static str> {
const GIT_COMMIT_GCLOUD: Option<&str> = option_env!("SHORT_SHA");
const GIT_COMMIT_VERGEN: Option<&str> = option_env!("VERGEN_GIT_SHA_SHORT");
GIT_COMMIT_GCLOUD.or(GIT_COMMIT_VERGEN)
}
}
/// 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).
#[allow(unknown_lints)]
#[allow(clippy::derivable_impls)]
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
}
/// Returns the framework components used by this application.
fn framework_components(
&mut self,
command: &Self::Cmd,
) -> Result<Vec<Box<dyn Component<Self>>>, FrameworkError> {
// Automatically use color if we're outputting to a terminal
//
// The `abcissa` docs claim that abscissa implements `Auto`, but it
// does not - except in `color_backtrace` backtraces.
let mut term_colors = self.term_colors(command);
if term_colors == ColorChoice::Auto {
// We want to disable colors on a per-stream basis, but that feature
// can only be implemented inside the terminal component streams.
// Instead, if either output stream is not a terminal, disable
// colors.
//
// We'd also like to check `config.tracing.use_color` here, but the
// config has not been loaded yet.
if !Self::outputs_are_ttys() {
term_colors = ColorChoice::Never;
}
}
let terminal = Terminal::new(term_colors);
Ok(vec![Box::new(terminal)])
}
/// 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> {
use crate::components::{
metrics::MetricsEndpoint, tokio::TokioComponent, tracing::TracingEndpoint,
};
let mut components = self.framework_components(command)?;
// Load config *after* framework components so that we can
// report an error to the terminal if it occurs.
let config = command
.config_path()
.map(|path| self.load_config(&path))
.transpose()?
.unwrap_or_default();
let config = command.process_config(config)?;
let theme = if Self::outputs_are_ttys() && config.tracing.use_color {
color_eyre::config::Theme::dark()
} else {
color_eyre::config::Theme::new()
};
// collect the common metadata for the issue URL and panic report,
// skipping any env vars that aren't present
let app_metadata = vec![
// cargo or git tag + short commit
("version", app_version().to_string()),
// config
("Zcash network", config.network.network.to_string()),
// constants
("state version", DATABASE_FORMAT_VERSION.to_string()),
];
// git env vars can be skipped if there is no `.git` during the
// build, so they must all be optional
let git_metadata: &[(_, Option<_>)] = &[
("branch", option_env!("VERGEN_GIT_BRANCH")),
("git commit", Self::git_commit()),
(
"commit timestamp",
option_env!("VERGEN_GIT_COMMIT_TIMESTAMP"),
),
];
// skip missing metadata
let git_metadata: Vec<(_, String)> = git_metadata
.iter()
.filter_map(|(k, v)| Some((k, (*v)?)))
.map(|(k, v)| (*k, v.to_string()))
.collect();
let build_metadata: Vec<_> = [
("target triple", env!("VERGEN_CARGO_TARGET_TRIPLE")),
("build profile", env!("VERGEN_CARGO_PROFILE")),
]
.iter()
.map(|(k, v)| (*k, v.to_string()))
.collect();
let panic_metadata: Vec<_> = app_metadata
.iter()
.chain(git_metadata.iter())
.chain(build_metadata.iter())
.collect();
let mut builder = color_eyre::config::HookBuilder::default();
let mut metadata_section = "Metadata:".to_string();
for (k, v) in panic_metadata {
builder = builder.add_issue_metadata(k, v.clone());
metadata_section.push_str(&format!("\n{}: {}", k, &v));
}
builder = builder
.theme(theme)
.panic_section(metadata_section)
.issue_url(concat!(env!("CARGO_PKG_REPOSITORY"), "/issues/new"))
.issue_filter(|kind| match kind {
color_eyre::ErrorKind::NonRecoverable(error) => {
let error_str = match error.downcast_ref::<String>() {
Some(as_string) => as_string,
None => return true,
};
// listener port conflicts
if PORT_IN_USE_ERROR.is_match(error_str) {
return false;
}
// RocksDB lock file conflicts
if LOCK_FILE_ERROR.is_match(error_str) {
return false;
}
true
}
color_eyre::ErrorKind::Recoverable(error) => {
// Type checks should be faster than string conversions.
//
// Don't ask users to create bug reports for timeouts and peer errors.
if error.is::<tower::timeout::error::Elapsed>()
|| error.is::<tokio::time::error::Elapsed>()
|| error.is::<zebra_network::PeerError>()
|| error.is::<zebra_network::SharedPeerError>()
|| error.is::<zebra_network::HandshakeError>()
{
return false;
}
let error_str = error.to_string();
!error_str.contains("timed out") && !error_str.contains("duplicate hash")
}
});
// This MUST happen after `Terminal::new` to ensure our preferred panic
// handler is the last one installed
let (panic_hook, eyre_hook) = builder.into_hooks();
eyre_hook.install().unwrap();
// The Sentry default config pulls in the DSN from the `SENTRY_DSN`
// environment variable.
#[cfg(feature = "enable-sentry")]
let guard = sentry::init(sentry::ClientOptions {
debug: true,
release: Some(app_version().to_string().into()),
..Default::default()
});
std::panic::set_hook(Box::new(move |panic_info| {
let panic_report = panic_hook.panic_report(panic_info);
eprintln!("{}", panic_report);
#[cfg(feature = "enable-sentry")]
{
let event = crate::sentry::panic_event_from(panic_report);
sentry::capture_event(event);
if !guard.close(None) {
warn!("unable to flush sentry events during panic");
}
}
}));
self.config = Some(config);
let cfg_ref = self
.config
.as_ref()
.expect("config is loaded before register_components");
let default_filter = if command.verbose { "debug" } else { "info" };
let is_server = command
.command
.as_ref()
.map(ZebradCmd::is_server)
.unwrap_or(false);
// Ignore the tracing filter for short-lived commands
let mut tracing_config = cfg_ref.tracing.clone();
if is_server {
// Override the default tracing filter based on the command-line verbosity.
tracing_config.filter = tracing_config
.filter
.or_else(|| Some(default_filter.to_owned()));
} else {
// Don't apply the configured filter for short-lived commands.
tracing_config.filter = Some(default_filter.to_owned());
tracing_config.flamegraph = None;
}
components.push(Box::new(Tracing::new(tracing_config)?));
// Activate the global span, so it's visible when we load the other
// components. Space is at a premium here, so we use an empty message,
// short commit hash, and the unique part of the network name.
let net = &self.config.clone().unwrap().network.network.to_string()[..4];
let global_span = if let Some(git_commit) = ZebradApp::git_commit() {
error_span!("", zebrad = git_commit, net)
} else {
error_span!("", net)
};
let global_guard = global_span.enter();
// leak the global span, to make sure it stays active
std::mem::forget(global_guard);
// Launch network and async endpoints only for long-running commands.
if is_server {
components.push(Box::new(TokioComponent::new()?));
components.push(Box::new(TracingEndpoint::new(cfg_ref)?));
components.push(Box::new(MetricsEndpoint::new(cfg_ref)?));
}
self.state.components.register(components)
}
/// Load this application's configuration and initialize its components.
fn init(&mut self, command: &Self::Cmd) -> Result<(), FrameworkError> {
// 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)?;
// Fire callback to signal state in the application lifecycle
let config = self.config.take().unwrap();
self.after_config(config)?;
Ok(())
}
/// 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.
fn after_config(&mut self, config: Self::Cfg) -> Result<(), FrameworkError> {
// Configure components
self.state.components.after_config(&config)?;
self.config = Some(config);
Ok(())
}
fn shutdown(&mut self, shutdown: Shutdown) -> ! {
// Some OSes require a flush to send all output to the terminal.
// zebrad's logging uses Abscissa, so we flush its streams.
//
// TODO:
// - if this doesn't work, send an empty line as well
// - move this code to the tracing component's `before_shutdown()`
let _ = stdout().lock().flush();
let _ = stderr().lock().flush();
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),
}
}
fn version(&self) -> Version {
app_version()
}
}