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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
//! Very simple implementation of logging via the Windows Event Log
use std::ffi::OsStr;
use std::ptr;
use log::{Level, Metadata, Record};
use winapi::shared::minwindef::WORD;
use winapi::um::{winbase, winnt};
use wio::wide::ToWide;
pub struct EventLogger {
pub name: Vec<u16>,
}
impl EventLogger {
pub fn new(name: impl AsRef<OsStr>) -> Self {
EventLogger {
name: name.to_wide_null(),
}
}
}
impl log::Log for EventLogger {
fn enabled(&self, metadata: &Metadata) -> bool {
metadata.level() <= log::max_level()
}
fn log(&self, record: &Record) {
if !self.enabled(record.metadata()) {
return;
}
let name = self.name.as_ptr();
let msg = format!("{} - {}", record.level(), record.args()).to_wide_null();
// Open and close the event log handle on every message, for simplicity.
let event_log;
unsafe {
event_log = winbase::RegisterEventSourceW(ptr::null(), name);
if event_log.is_null() {
return;
}
}
let level = match record.level() {
Level::Error => winnt::EVENTLOG_ERROR_TYPE,
Level::Warn => winnt::EVENTLOG_WARNING_TYPE,
Level::Info | Level::Debug | Level::Trace => winnt::EVENTLOG_INFORMATION_TYPE,
};
unsafe {
// mut only to match the LPCWSTR* signature
let mut msg_array: [*const u16; 1] = [msg.as_ptr()];
let _ = winbase::ReportEventW(
event_log,
level,
0, // no category
0, // event id 0
ptr::null_mut(), // no user sid
msg_array.len() as WORD, // string count
0, // 0 bytes raw data
msg_array.as_mut_ptr(), // strings
ptr::null_mut(), // no raw data
);
let _ = winbase::DeregisterEventSource(event_log);
}
}
fn flush(&self) {}
}
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