[pbs-devel] [PATCH proxmox v4 1/4] proxmox-log: add tracing infrastructure
Gabriel Goller
g.goller at proxmox.com
Wed Apr 17 16:13:15 CEST 2024
Add the `proxmox_log` crate which includes the new logging infra.
Export the `init_logger` function, which creates the `tracing` logger
that includes the default subscriber and a single custom layer.
This layer checks on every event/log if a FileLogger is set in the
task-local-storage, if it is, then log to the specified file, otherwise
to syslog.
Signed-off-by: Gabriel Goller <g.goller at proxmox.com>
---
Cargo.toml | 6 +
proxmox-log/Cargo.toml | 23 ++++
proxmox-log/debian/changelog | 5 +
proxmox-log/debian/control | 52 +++++++++
proxmox-log/debian/copyright | 18 +++
proxmox-log/debian/debcargo.toml | 7 ++
proxmox-log/src/file_logger.rs | 147 ++++++++++++++++++++++++
proxmox-log/src/lib.rs | 37 ++++++
proxmox-log/src/syslog_tasklog_layer.rs | 106 +++++++++++++++++
proxmox-rest-server/Cargo.toml | 2 +
10 files changed, 403 insertions(+)
create mode 100644 proxmox-log/Cargo.toml
create mode 100644 proxmox-log/debian/changelog
create mode 100644 proxmox-log/debian/control
create mode 100644 proxmox-log/debian/copyright
create mode 100644 proxmox-log/debian/debcargo.toml
create mode 100644 proxmox-log/src/file_logger.rs
create mode 100644 proxmox-log/src/lib.rs
create mode 100644 proxmox-log/src/syslog_tasklog_layer.rs
diff --git a/Cargo.toml b/Cargo.toml
index 535d245..2dcb6bd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,6 +14,7 @@ members = [
"proxmox-io",
"proxmox-lang",
"proxmox-ldap",
+ "proxmox-log",
"proxmox-login",
"proxmox-metrics",
"proxmox-notify",
@@ -87,11 +88,15 @@ serde_cbor = "0.11.1"
serde_json = "1.0"
serde_plain = "1.0"
syn = { version = "2", features = [ "full", "visit-mut" ] }
+syslog = "6"
tar = "0.4"
tokio = "1.6"
tokio-openssl = "0.6.1"
tokio-stream = "0.1.0"
tower-service = "0.3.0"
+tracing = "0.1"
+tracing-log = { version = "0.1.3", default-features = false }
+tracing-subscriber = "0.3.16"
url = "2.2"
walkdir = "2"
webauthn-rs = "0.3"
@@ -106,6 +111,7 @@ proxmox-http-error = { version = "0.1.0", path = "proxmox-http-error" }
proxmox-human-byte = { version = "0.1.0", path = "proxmox-human-byte" }
proxmox-io = { version = "1.0.0", path = "proxmox-io" }
proxmox-lang = { version = "1.1", path = "proxmox-lang" }
+proxmox-log= { version = "0.1.0", path = "proxmox-log" }
proxmox-login = { version = "0.1.0", path = "proxmox-login" }
proxmox-rest-server = { version = "0.5.2", path = "proxmox-rest-server" }
proxmox-router = { version = "2.1.3", path = "proxmox-router" }
diff --git a/proxmox-log/Cargo.toml b/proxmox-log/Cargo.toml
new file mode 100644
index 0000000..14ca6c7
--- /dev/null
+++ b/proxmox-log/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "proxmox-log"
+version = "0.1.0"
+authors.workspace = true
+edition.workspace = true
+license.workspace = true
+repository.workspace = true
+description = "Logging infrastructure for proxmox"
+
+exclude.workspace = true
+
+[dependencies]
+anyhow.workspace = true
+syslog.workspace = true
+nix.workspace = true
+log.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true
+tracing-log = { workspace = true, features = ["std"] }
+tokio = { workspace = true, features = ["rt-multi-thread"] }
+proxmox-time.workspace = true
+proxmox-sys.workspace = true
+
diff --git a/proxmox-log/debian/changelog b/proxmox-log/debian/changelog
new file mode 100644
index 0000000..3661bae
--- /dev/null
+++ b/proxmox-log/debian/changelog
@@ -0,0 +1,5 @@
+rust-proxmox-log (0.1.0-3) UNRELEASED; urgency=medium
+
+ * Initial release
+
+ -- Gabriel Goller <ggoller at luna.proxmox.com> Wed, 11 Oct 2023 15:13:58 +0200
diff --git a/proxmox-log/debian/control b/proxmox-log/debian/control
new file mode 100644
index 0000000..14b2376
--- /dev/null
+++ b/proxmox-log/debian/control
@@ -0,0 +1,52 @@
+Source: rust-proxmox-log
+Section: rust
+Priority: optional
+Build-Depends: debhelper (>= 12),
+ dh-cargo (>= 25),
+ cargo:native <!nocheck>,
+ rustc:native <!nocheck>,
+ libstd-rust-dev <!nocheck>,
+ librust-anyhow-1+default-dev <!nocheck>,
+ librust-log-0.4+default-dev (>= 0.4.17-~~) <!nocheck>,
+ librust-nix-0.26+default-dev (>= 0.26.1-~~) <!nocheck>,
+ librust-proxmox-sys-0.5+default-dev (>= 0.5.1-~~) <!nocheck>,
+ librust-proxmox-time-1+default-dev (>= 1.1.6-~~) <!nocheck>,
+ librust-syslog-6+default-dev <!nocheck>,
+ librust-tokio-1+default-dev (>= 1.6-~~) <!nocheck>,
+ librust-tokio-1+rt-multi-thread-dev (>= 1.6-~~) <!nocheck>,
+ librust-tracing-0.1+default-dev <!nocheck>,
+ librust-tracing-log-0.1-dev (>= 0.1.3-~~) <!nocheck>,
+ librust-tracing-subscriber-0.3+default-dev (>= 0.3.16-~~) <!nocheck>
+Maintainer: Proxmox Support Team <support at proxmox.com>
+Standards-Version: 4.6.2
+Vcs-Git: git://git.proxmox.com/git/proxmox.git
+Vcs-Browser: https://git.proxmox.com/?p=proxmox.git
+X-Cargo-Crate: proxmox-log
+Rules-Requires-Root: no
+
+Package: librust-proxmox-log-dev
+Architecture: any
+Multi-Arch: same
+Depends:
+ ${misc:Depends},
+ librust-anyhow-1+default-dev,
+ librust-log-0.4+default-dev (>= 0.4.17-~~),
+ librust-nix-0.26+default-dev (>= 0.26.1-~~),
+ librust-proxmox-sys-0.5+default-dev (>= 0.5.1-~~),
+ librust-proxmox-time-1+default-dev (>= 1.1.6-~~),
+ librust-syslog-6+default-dev,
+ librust-tokio-1+default-dev (>= 1.6-~~),
+ librust-tokio-1+rt-multi-thread-dev (>= 1.6-~~),
+ librust-tracing-0.1+default-dev,
+ librust-tracing-log-0.1-dev (>= 0.1.3-~~),
+ librust-tracing-subscriber-0.3+default-dev (>= 0.3.16-~~)
+Provides:
+ librust-proxmox-log+default-dev (= ${binary:Version}),
+ librust-proxmox-log-0-dev (= ${binary:Version}),
+ librust-proxmox-log-0+default-dev (= ${binary:Version}),
+ librust-proxmox-log-0.1-dev (= ${binary:Version}),
+ librust-proxmox-log-0.1+default-dev (= ${binary:Version}),
+ librust-proxmox-log-0.1.0-dev (= ${binary:Version}),
+ librust-proxmox-log-0.1.0+default-dev (= ${binary:Version})
+Description: Logging infrastructure for proxmox - Rust source code
+ Source code for Debianized Rust crate "proxmox-log"
diff --git a/proxmox-log/debian/copyright b/proxmox-log/debian/copyright
new file mode 100644
index 0000000..b227c29
--- /dev/null
+++ b/proxmox-log/debian/copyright
@@ -0,0 +1,18 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+
+Files:
+ *
+Copyright: 2019 - 2024 Proxmox Server Solutions GmbH <support at proxmox.com>
+License: AGPL-3.0-or-later
+ This program is free software: you can redistribute it and/or modify it under
+ the terms of the GNU Affero General Public License as published by the Free
+ Software Foundation, either version 3 of the License, or (at your option) any
+ later version.
+ .
+ This program is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+ details.
+ .
+ You should have received a copy of the GNU Affero General Public License along
+ with this program. If not, see <https://www.gnu.org/licenses/>.
diff --git a/proxmox-log/debian/debcargo.toml b/proxmox-log/debian/debcargo.toml
new file mode 100644
index 0000000..b7864cd
--- /dev/null
+++ b/proxmox-log/debian/debcargo.toml
@@ -0,0 +1,7 @@
+overlay = "."
+crate_src_path = ".."
+maintainer = "Proxmox Support Team <support at proxmox.com>"
+
+[source]
+vcs_git = "git://git.proxmox.com/git/proxmox.git"
+vcs_browser = "https://git.proxmox.com/?p=proxmox.git"
diff --git a/proxmox-log/src/file_logger.rs b/proxmox-log/src/file_logger.rs
new file mode 100644
index 0000000..c7e1d64
--- /dev/null
+++ b/proxmox-log/src/file_logger.rs
@@ -0,0 +1,147 @@
+use std::io::Write;
+
+use anyhow::Error;
+use nix::fcntl::OFlag;
+
+use proxmox_sys::fs::{atomic_open_or_create_file, CreateOptions};
+
+/// Options to control the behavior of a [FileLogger] instance
+#[derive(Default)]
+pub struct FileLogOptions {
+ /// Open underlying log file in append mode, useful when multiple concurrent processes
+ /// want to log to the same file (e.g., HTTP access log). Note that it is only atomic
+ /// for writes smaller than the PIPE_BUF (4k on Linux).
+ /// Inside the same process you may need to still use an mutex, for shared access.
+ pub append: bool,
+ /// Open underlying log file as readable
+ pub read: bool,
+ /// If set, ensure that the file is newly created or error out if already existing.
+ pub exclusive: bool,
+ /// Duplicate logged messages to STDOUT, like tee
+ pub to_stdout: bool,
+ /// Prefix messages logged to the file with the current local time as RFC 3339
+ pub prefix_time: bool,
+ /// File owner/group and mode
+ pub file_opts: CreateOptions,
+}
+
+/// Log messages with optional automatically added timestamps into files
+///
+/// #### Example:
+/// ```
+/// # use anyhow::{bail, format_err, Error};
+/// use proxmox_log::{flog, FileLogger, FileLogOptions};
+///
+/// # std::fs::remove_file("test.log");
+/// let options = FileLogOptions {
+/// to_stdout: true,
+/// exclusive: true,
+/// ..Default::default()
+/// };
+/// let mut log = FileLogger::new("test.log", options).unwrap();
+/// flog!(log, "A simple log: {}", "Hello!");
+/// # std::fs::remove_file("test.log");
+/// ```
+pub struct FileLogger {
+ file: std::fs::File,
+ file_name: std::path::PathBuf,
+ options: FileLogOptions,
+}
+
+/// Log messages to [FileLogger] - ``println`` like macro
+#[macro_export]
+macro_rules! flog {
+ ($log:expr, $($arg:tt)*) => ({
+ $log.log(format!($($arg)*));
+ })
+}
+
+impl FileLogger {
+ pub fn new<P: AsRef<std::path::Path>>(
+ file_name: P,
+ options: FileLogOptions,
+ ) -> Result<Self, Error> {
+ let file = Self::open(&file_name, &options)?;
+
+ let file_name: std::path::PathBuf = file_name.as_ref().to_path_buf();
+
+ Ok(Self {
+ file,
+ file_name,
+ options,
+ })
+ }
+
+ pub fn reopen(&mut self) -> Result<&Self, Error> {
+ let file = Self::open(&self.file_name, &self.options)?;
+ self.file = file;
+ Ok(self)
+ }
+
+ fn open<P: AsRef<std::path::Path>>(
+ file_name: P,
+ options: &FileLogOptions,
+ ) -> Result<std::fs::File, Error> {
+ let mut flags = OFlag::O_CLOEXEC;
+
+ if options.read {
+ flags |= OFlag::O_RDWR;
+ } else {
+ flags |= OFlag::O_WRONLY;
+ }
+
+ if options.append {
+ flags |= OFlag::O_APPEND;
+ }
+ if options.exclusive {
+ flags |= OFlag::O_EXCL;
+ }
+
+ let file =
+ atomic_open_or_create_file(&file_name, flags, &[], options.file_opts.clone(), false)?;
+
+ Ok(file)
+ }
+
+ pub fn log<S: AsRef<str>>(&mut self, msg: S) {
+ let msg = msg.as_ref();
+
+ if self.options.to_stdout {
+ let mut stdout = std::io::stdout();
+ stdout.write_all(msg.as_bytes()).unwrap();
+ stdout.write_all(b"\n").unwrap();
+ }
+
+ let line = if self.options.prefix_time {
+ let now = proxmox_time::epoch_i64();
+ let rfc3339 = match proxmox_time::epoch_to_rfc3339(now) {
+ Ok(rfc3339) => rfc3339,
+ Err(_) => "1970-01-01T00:00:00Z".into(), // for safety, should really not happen!
+ };
+ format!("{}: {}\n", rfc3339, msg)
+ } else {
+ format!("{}\n", msg)
+ };
+ if let Err(err) = self.file.write_all(line.as_bytes()) {
+ // avoid panicking, log methods should not do that
+ // FIXME: or, return result???
+ log::error!("error writing to log file - {}", err);
+ }
+ }
+}
+
+impl std::io::Write for FileLogger {
+ fn write(&mut self, buf: &[u8]) -> Result<usize, std::io::Error> {
+ if self.options.to_stdout {
+ let _ = std::io::stdout().write(buf);
+ }
+ self.file.write(buf)
+ }
+
+ fn flush(&mut self) -> Result<(), std::io::Error> {
+ if self.options.to_stdout {
+ let _ = std::io::stdout().flush();
+ }
+ self.file.flush()
+ }
+}
diff --git a/proxmox-log/src/lib.rs b/proxmox-log/src/lib.rs
new file mode 100644
index 0000000..daaaede
--- /dev/null
+++ b/proxmox-log/src/lib.rs
@@ -0,0 +1,37 @@
+use std::{
+ cell::{Cell, RefCell},
+ env,
+};
+use syslog_tasklog_layer::SyslogAndTasklogLayer;
+use tracing_log::{AsLog, LogTracer};
+use tracing_subscriber::filter::LevelFilter;
+use tracing_subscriber::prelude::*;
+
+mod file_logger;
+pub use file_logger::{FileLogOptions, FileLogger};
+
+mod syslog_tasklog_layer;
+
+tokio::task_local! {
+ pub static LOGGER: RefCell<FileLogger>;
+ pub static WARN_COUNTER: Cell<u64> ;
+}
+
+pub fn init_logger(
+ env_var_name: &str,
+ default_log_level: LevelFilter,
+ application_name: &str,
+) -> Result<(), anyhow::Error> {
+ let mut log_level = default_log_level;
+ if let Ok(v) = env::var(env_var_name) {
+ if let Ok(l) = v.parse::<LevelFilter>() {
+ log_level = l;
+ }
+ }
+ let registry = tracing_subscriber::registry()
+ .with(SyslogAndTasklogLayer::new(application_name.to_string()).with_filter(log_level));
+
+ tracing::subscriber::set_global_default(registry)?;
+ LogTracer::init_with_filter(log_level.as_log())?;
+ Ok(())
+}
diff --git a/proxmox-log/src/syslog_tasklog_layer.rs b/proxmox-log/src/syslog_tasklog_layer.rs
new file mode 100644
index 0000000..89437ca
--- /dev/null
+++ b/proxmox-log/src/syslog_tasklog_layer.rs
@@ -0,0 +1,106 @@
+use std::fmt::Write as _;
+use std::sync::Arc;
+use std::sync::Mutex;
+
+use syslog::{Formatter3164, LoggerBackend};
+use tracing::field::Field;
+use tracing::field::Visit;
+use tracing::Event;
+use tracing::Level;
+use tracing::Subscriber;
+use tracing_subscriber::layer::Context;
+use tracing_subscriber::Layer;
+
+use crate::FileLogger;
+use crate::LOGGER;
+use crate::WARN_COUNTER;
+
+pub struct SyslogAndTasklogLayer {
+ syslog_logger: Arc<Mutex<syslog::Logger<LoggerBackend, Formatter3164>>>,
+}
+
+impl SyslogAndTasklogLayer {
+ pub fn new(application_name: String) -> Self {
+ let formatter = Formatter3164 {
+ facility: syslog::Facility::LOG_DAEMON,
+ process: application_name,
+ ..Formatter3164::default()
+ };
+
+ // we panic here if we can't initialize the syslogger
+ let logger = syslog::unix(formatter)
+ .map_err(|e| {
+ anyhow::Error::new(std::io::Error::new(
+ std::io::ErrorKind::Other,
+ e.description(),
+ ))
+ })
+ .unwrap();
+
+ let logger = Arc::new(Mutex::new(logger));
+
+ Self {
+ syslog_logger: logger,
+ }
+ }
+}
+
+impl<S: Subscriber> Layer<S> for SyslogAndTasklogLayer {
+ fn on_event(&self, event: &Event<'_>, _ctx: Context<'_, S>) {
+ let mut buf = String::new();
+ event.record(&mut EventVisitor::new(&mut buf));
+ let level = event.metadata().level();
+
+ let result = LOGGER.try_with(|logger| {
+ log_to_file(&mut logger.borrow_mut(), level, &buf);
+ });
+ if result.is_err() || *level == Level::ERROR {
+ log_to_syslog(&mut self.syslog_logger.lock().unwrap(), level, &buf);
+ }
+ }
+}
+
+fn log_to_syslog(
+ logger: &mut syslog::Logger<LoggerBackend, Formatter3164>,
+ level: &Level,
+ buf: &String,
+) {
+ let _ = match *level {
+ Level::ERROR => logger.err(buf),
+ Level::WARN => logger.warning(buf),
+ Level::INFO => logger.info(buf),
+ Level::DEBUG => logger.debug(buf),
+ Level::TRACE => logger.debug(buf),
+ };
+}
+fn log_to_file(logger: &mut FileLogger, level: &Level, buf: &String) {
+ match *level {
+ Level::ERROR | Level::WARN => {
+ WARN_COUNTER.with(|counter| {
+ counter.set(counter.get() + 1);
+ });
+ logger.log(buf);
+ }
+ Level::INFO => logger.log(buf),
+ Level::DEBUG => logger.log(format!("DEBUG: {}", buf)),
+ Level::TRACE => logger.log(format!("TRACE: {}", buf)),
+ };
+}
+
+struct EventVisitor<'a> {
+ buf: &'a mut String,
+}
+
+impl<'a> EventVisitor<'a> {
+ fn new(buf: &'a mut String) -> Self {
+ Self { buf }
+ }
+}
+
+impl Visit for EventVisitor<'_> {
+ fn record_debug(&mut self, field: &Field, value: &dyn std::fmt::Debug) {
+ if field.name() == "message" {
+ let _ = write!(self.buf, "{value:?}");
+ }
+ }
+}
diff --git a/proxmox-rest-server/Cargo.toml b/proxmox-rest-server/Cargo.toml
index 94330ff..2bfea4a 100644
--- a/proxmox-rest-server/Cargo.toml
+++ b/proxmox-rest-server/Cargo.toml
@@ -34,6 +34,7 @@ tokio-openssl.workspace = true
tokio-stream.workspace = true
tower-service.workspace = true
url.workspace = true
+tracing.workspace = true
proxmox-async.workspace = true
proxmox-compression.workspace = true
@@ -44,6 +45,7 @@ proxmox-router.workspace = true
proxmox-schema = { workspace = true, features = [ "api-macro", "upid-api-impl" ] }
proxmox-sys = { workspace = true, features = [ "logrotate", "timer" ] }
proxmox-time.workspace = true
+proxmox-log.workspace = true
[features]
default = []
--
2.43.0
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