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|
mod test_utils;
use cond_sync::{CondSync, Other};
use flexi_logger::{
Age, Cleanup, Criterion, DeferredNow, Duplicate, FileSpec, LogSpecification, Logger, Naming,
TS_DASHES_BLANK_COLONS_DOT_BLANK,
};
use glob::glob;
use log::*;
use std::{
fs::File,
io::{BufRead, BufReader},
ops::Add,
thread::JoinHandle,
};
const NO_OF_THREADS: usize = 5;
const NO_OF_LOGLINES_PER_THREAD: usize = 20_000;
// we use a special log line format that starts with a special string so that it is easier to
// verify that all log lines are written correctly
#[test]
fn test_multi_threaded_dates() {
let directory = test_utils::dir();
{
let _stopwatch = test_utils::Stopwatch::default();
let logger = Logger::try_with_str("debug")
.unwrap()
.log_to_file(FileSpec::default().directory(&directory))
.format(test_format)
.create_symlink("link_to_mt_log")
.duplicate_to_stderr(Duplicate::Info)
.rotate(
Criterion::Age(Age::Second),
Naming::Timestamps,
Cleanup::Never,
)
.start()
.unwrap_or_else(|e| panic!("Logger initialization failed with {e}"));
info!("create many log lines with a considerable number of threads, verify the log");
let cond_sync = CondSync::new(0_usize);
let worker_handles = start_worker_threads(NO_OF_THREADS, &cond_sync);
cond_sync
.wait_until(|value| *value == NO_OF_THREADS)
.unwrap();
logger.set_new_spec(LogSpecification::parse("trace").unwrap());
join_all_workers(worker_handles);
} // drop stopwatch
verify_logs(&directory.display().to_string());
}
// Starts given number of worker threads and lets each execute `do_work`
fn start_worker_threads(no_of_workers: usize, cond_sync: &CondSync<usize>) -> Vec<JoinHandle<u8>> {
let mut worker_handles: Vec<JoinHandle<u8>> = Vec::with_capacity(no_of_workers);
trace!("Starting {} worker threads", no_of_workers);
for thread_number in 0..no_of_workers {
trace!("Starting thread {}", thread_number);
let cond_sync_t = cond_sync.clone();
worker_handles.push(
std::thread::Builder::new()
.name(thread_number.to_string())
.spawn(move || {
do_work(thread_number, cond_sync_t);
0
})
.unwrap(),
);
}
trace!("All {} worker threads started.", worker_handles.len());
worker_handles
}
fn do_work(thread_number: usize, cond_sync: CondSync<usize>) {
trace!("({}) Thread started working", thread_number);
trace!("ERROR_IF_PRINTED");
cond_sync
.modify_and_notify(|value| *value += 1, Other::One)
.unwrap();
for idx in 0..NO_OF_LOGLINES_PER_THREAD {
debug!("({}) writing out line number {}", thread_number, idx);
}
trace!("MUST_BE_PRINTED");
}
fn join_all_workers(worker_handles: Vec<JoinHandle<u8>>) {
for worker_handle in worker_handles {
worker_handle
.join()
.unwrap_or_else(|e| panic!("Joining worker thread failed: {e:?}"));
}
trace!("All worker threads joined.");
}
pub fn test_format(
w: &mut dyn std::io::Write,
now: &mut DeferredNow,
record: &Record,
) -> std::io::Result<()> {
write!(
w,
"XXXXX [{}] T[{:?}] {} [{}:{}] {}",
now.format(TS_DASHES_BLANK_COLONS_DOT_BLANK),
std::thread::current().name().unwrap_or("<unnamed>"),
record.level(),
record.file().unwrap_or("<unnamed>"),
record.line().unwrap_or(0),
&record.args()
)
}
fn verify_logs(directory: &str) {
// read all files
let pattern = String::from(directory).add("/*");
let globresults = match glob(&pattern) {
Err(e) => panic!("Is this ({pattern}) really a directory? Listing failed with {e}",),
Ok(globresults) => globresults,
};
let mut no_of_log_files = 0;
let mut line_count = 0_usize;
for globresult in globresults {
let pathbuf = globresult.unwrap_or_else(|e| panic!("Ups - error occured: {e}"));
let f = File::open(&pathbuf)
.unwrap_or_else(|e| panic!("Cannot open file {pathbuf:?} due to {e}"));
no_of_log_files += 1;
let mut reader = BufReader::new(f);
let mut buffer = String::new();
while reader.read_line(&mut buffer).unwrap() > 0 {
if buffer.starts_with("XXXXX") {
line_count += 1;
} else {
panic!("irregular line in log file {pathbuf:?}: \"{buffer}\"");
}
buffer.clear();
}
}
assert_eq!(
line_count,
NO_OF_THREADS * (NO_OF_LOGLINES_PER_THREAD + 1) + 3
);
println!(
"Found {line_count} log lines from {NO_OF_THREADS} threads in {no_of_log_files} files",
);
}
|
