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https://github.com/cloud-hypervisor/cloud-hypervisor.git
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50b33db718
Unify log formatting and printing as `eprintln!` and `log::error!` would be used alongside each other. When using e.g. `env_logger` lines printed with `eprintln!` would lack formatting / colors. Currently only relevant in `ch-remote` + `cli_print_error_chain`. Note that the replaced messages now also end up in the logfile of `cloud-hypervisor` when configured and not any longer in stderr. Signed-off-by: Maximilian Güntner <code@mguentner.de>
47 lines
1.4 KiB
Rust
47 lines
1.4 KiB
Rust
// Copyright © 2025 Cyberus Technology GmbH
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//
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// SPDX-License-Identifier: Apache-2.0
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use std::error::Error;
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use log::error;
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/// Prints a chain of errors to the user in a consistent manner.
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/// The user will see a clear chain of errors, followed by debug output
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/// for opening issues.
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pub fn cli_print_error_chain<'a>(
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top_error: &'a (dyn Error + 'static),
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component: &str,
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// Function optionally returning the display representation of an error.
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display_modifier: impl Fn(
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/* level */ usize,
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/*indention */ usize,
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&'a (dyn Error + 'static),
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) -> Option<String>,
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) {
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eprint!("Error: {component} exited with the following ");
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if top_error.source().is_none() {
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error!("error:");
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error!(" {top_error}");
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} else {
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error!("chain of errors:");
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std::iter::successors(Some(top_error), |sub_error| {
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// Dereference necessary to mitigate rustc compiler bug.
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// See <https://github.com/rust-lang/rust/issues/141673>
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(*sub_error).source()
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})
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.enumerate()
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.for_each(|(level, error)| {
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// Special case: handling of HTTP Server responses in ch-remote
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if let Some(message) = display_modifier(level, 2, error) {
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error!("{message}");
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} else {
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error!(" {level}: {error}");
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}
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});
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}
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error!("");
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error!("Debug Info: {top_error:?}");
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}
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