feat(main): Implement receiver & flushing logic
The only thing missing for a 0.1 test run is the actual gRPC call to Stackdriver.
This commit is contained in:
Vincent Ambo
parent
c5cd12b81f
commit
6793b25a67
4 changed files with 331 additions and 88 deletions
226
Cargo.lock
generated
226
Cargo.lock
generated
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@ -1,3 +1,21 @@
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@ -29,6 +47,27 @@ name = "cfg-if"
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@ -48,30 +87,117 @@ dependencies = [
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|
||||
"checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
|
||||
"checksum winapi 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "04e3bd221fcbe8a271359c04f21a76db7d0c6028862d1bb5512d85e1e2eb5bb3"
|
||||
"checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||
"checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||
"checksum wincolor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "eeb06499a3a4d44302791052df005d5232b927ed1a9658146d842165c4de7767"
|
||||
|
|
|
|||
|
|
@ -6,6 +6,9 @@ authors = ["Vincent Ambo <mail@tazj.in>"]
|
|||
[dependencies]
|
||||
libc = "0.2"
|
||||
failure = "0.1"
|
||||
systemd = "0.3"
|
||||
log = "0.4"
|
||||
env_logger = "0.5"
|
||||
|
||||
[build-dependencies]
|
||||
pkg-config = "0.3"
|
||||
|
|
|
|||
|
|
@ -1,71 +0,0 @@
|
|||
//! This module contains FFI-bindings to the journald APi. See
|
||||
//! sd-journal(3) for detailed information about the API.
|
||||
//!
|
||||
//! Only calls required by journaldriver are implemented.
|
||||
|
||||
/// This type represents an opaque pointer to an `sd_journal` struct.
|
||||
/// It should be changed to an `extern type` once RF1861 is
|
||||
/// stabilized.
|
||||
enum SdJournal {}
|
||||
|
||||
use failure::Error;
|
||||
use std::mem;
|
||||
|
||||
extern {
|
||||
fn sd_journal_open(sd_journal: *mut SdJournal, flags: usize) -> usize;
|
||||
fn sd_journal_close(sd_journal: *mut SdJournal);
|
||||
fn sd_journal_next(sd_journal: *mut SdJournal) -> usize;
|
||||
}
|
||||
|
||||
// Safe interface:
|
||||
|
||||
/// This struct contains the opaque data used by libsystemd to
|
||||
/// reference the journal.
|
||||
pub struct Journal {
|
||||
sd_journal: *mut SdJournal,
|
||||
}
|
||||
|
||||
impl Drop for Journal {
|
||||
fn drop(&mut self) {
|
||||
unsafe {
|
||||
sd_journal_close(self.sd_journal);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Open the journal for reading. No flags are supplied to libsystemd,
|
||||
/// which means that all journal entries will become available.
|
||||
pub fn open_journal() -> Result<Journal, Error> {
|
||||
let (mut sd_journal, result) = unsafe {
|
||||
let mut journal: SdJournal = mem::uninitialized();
|
||||
let result = sd_journal_open(&mut journal, 0);
|
||||
(journal, result)
|
||||
};
|
||||
|
||||
ensure!(result == 0, "Could not open journal (errno: {})", result);
|
||||
Ok(Journal { sd_journal: &mut sd_journal })
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
pub enum NextEntry {
|
||||
/// If no new entries are available in the journal this variant is
|
||||
/// returned.
|
||||
NoEntry,
|
||||
|
||||
Entry,
|
||||
}
|
||||
|
||||
impl Journal {
|
||||
pub fn read_next(&self) -> Result<NextEntry, Error> {
|
||||
let result = unsafe {
|
||||
sd_journal_next(self.sd_journal)
|
||||
};
|
||||
|
||||
match result {
|
||||
0 => Ok(NextEntry::NoEntry),
|
||||
1 => Ok(NextEntry::Entry),
|
||||
n if n > 1 => bail!("Journal unexpectedly advanced by {} entries!", n),
|
||||
_ => bail!("An error occured while advancing the journal (errno: {})", result),
|
||||
}
|
||||
}
|
||||
}
|
||||
119
src/main.rs
119
src/main.rs
|
|
@ -1,22 +1,107 @@
|
|||
#[macro_use] extern crate failure;
|
||||
extern crate libc;
|
||||
// #[macro_use] extern crate failure;
|
||||
#[macro_use] extern crate log;
|
||||
|
||||
mod journald;
|
||||
extern crate env_logger;
|
||||
extern crate systemd;
|
||||
|
||||
use systemd::journal::*;
|
||||
use std::process;
|
||||
use std::thread;
|
||||
use std::sync::mpsc::{channel, Receiver};
|
||||
use std::time::{Duration, Instant};
|
||||
use std::collections::vec_deque::{VecDeque, Drain};
|
||||
|
||||
fn main() {
|
||||
let mut journal = match journald::open_journal() {
|
||||
Ok(journal) => journal,
|
||||
Err(e) => {
|
||||
println!("{}", e);
|
||||
process::exit(1);
|
||||
},
|
||||
};
|
||||
|
||||
println!("foo");
|
||||
|
||||
let entry = journal.read_next();
|
||||
|
||||
println!("Entry: {:?}", entry)
|
||||
#[derive(Debug)]
|
||||
struct Record {
|
||||
message: Option<String>,
|
||||
hostname: Option<String>,
|
||||
unit: Option<String>,
|
||||
timestamp: Option<String>,
|
||||
}
|
||||
|
||||
impl From<JournalRecord> for Record {
|
||||
fn from(mut record: JournalRecord) -> Record {
|
||||
Record {
|
||||
// The message field is technically just a convention, but
|
||||
// journald seems to default to it when ingesting unit
|
||||
// output.
|
||||
message: record.remove("MESSAGE"),
|
||||
|
||||
// Presumably this is always set, but who can be sure
|
||||
// about anything in this world.
|
||||
hostname: record.remove("_HOSTNAME"),
|
||||
|
||||
// The unit is seemingly missing on kernel entries, but
|
||||
// present on all others.
|
||||
unit: record.remove("_SYSTEMD_UNIT"),
|
||||
|
||||
// This timestamp is present on most log entries
|
||||
// (seemingly all that are ingested from the output
|
||||
// systemd units).
|
||||
timestamp: record.remove("_SOURCE_REALTIME_TIMESTAMP"),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// This function spawns a double-looped, blocking receiver. It will
|
||||
/// buffer messages for a second before flushing them to Stackdriver.
|
||||
fn receiver_loop(rx: Receiver<Record>) {
|
||||
let mut buf = VecDeque::new();
|
||||
let iteration = Duration::from_millis(500);
|
||||
|
||||
loop {
|
||||
trace!("Beginning outer iteration");
|
||||
let now = Instant::now();
|
||||
|
||||
loop {
|
||||
if now.elapsed() > iteration {
|
||||
break;
|
||||
}
|
||||
|
||||
if let Ok(record) = rx.recv_timeout(iteration) {
|
||||
buf.push_back(record);
|
||||
}
|
||||
}
|
||||
|
||||
if !buf.is_empty() {
|
||||
flush(buf.drain(..));
|
||||
}
|
||||
|
||||
trace!("Done outer iteration");
|
||||
}
|
||||
}
|
||||
|
||||
/// Flushes all drained records to Stackdriver.
|
||||
fn flush(drain: Drain<Record>) {
|
||||
let record_count = drain.count();
|
||||
debug!("Flushed {} records", record_count);
|
||||
}
|
||||
|
||||
fn main () {
|
||||
env_logger::init();
|
||||
|
||||
let mut journal = Journal::open(JournalFiles::All, false, true)
|
||||
.expect("Failed to open systemd journal");
|
||||
|
||||
match journal.seek(JournalSeek::Tail) {
|
||||
Ok(cursor) => info!("Opened journal at cursor '{}'", cursor),
|
||||
Err(err) => {
|
||||
error!("Failed to set initial journal position: {}", err);
|
||||
process::exit(1)
|
||||
}
|
||||
}
|
||||
|
||||
let (tx, rx) = channel();
|
||||
|
||||
let _receiver = thread::spawn(move || receiver_loop(rx));
|
||||
|
||||
journal.watch_all_elements(move |record| {
|
||||
let record: Record = record.into();
|
||||
|
||||
if record.message.is_some() {
|
||||
tx.send(record).ok();
|
||||
}
|
||||
|
||||
Ok(())
|
||||
}).expect("Failed to read new entries from journal");
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue