Initial project import

tools/v/vlib/log/file_log_test.v

@@ -0,0 +1,67 @@
+import os
+import log
+import rand
+
+fn test_reopen() {
+	if os.user_os() == 'windows' && os.getenv('SKIP_TEST_REOPEN') == '' {
+		eprintln('skip renaming and reopening a log file on windows')
+		exit(0)
+	}
+	lfolder := os.join_path(os.vtmp_dir(), rand.ulid())
+	lpath1 := os.join_path(lfolder, 'current.log')
+	lpath2 := os.join_path(lfolder, 'current.log.2')
+	os.mkdir_all(lfolder)!
+
+	dump(lfolder)
+	mut l := log.new_thread_safe_log()
+	l.set_level(.debug)
+	l.set_full_logpath(lpath1)
+	l.warn('one warning')
+	l.error('one error')
+	// simulate a log rotation, by moving the log file
+	os.rename(lpath1, lpath2)!
+	l.warn('another warning')
+	// call reopen, note that the message from above, should be in the new file lpath2:
+	l.reopen()!
+	l.warn('third warning')
+	l.flush()
+	l.close()
+	// os.system('ls -la ${lpath1} ${lpath2}')
+	lcontent1 := os.read_file(lpath1)!
+	lcontent2 := os.read_file(lpath2)!
+	assert lcontent1.len > 0
+	assert lcontent2.len > 0
+	// the rotated log should have all messages before the l.reopen() call:
+	assert lcontent2.contains('one warning')
+	assert lcontent2.contains('one error')
+	assert lcontent2.contains('another warning')
+	// the log file that was reopened, should have only the new message:
+	assert lcontent1.contains('third warning')
+	assert !lcontent1.contains('one warning')
+
+	os.rmdir_all(lfolder) or {}
+}
+
+fn test_set_always_flush() {
+	log.set_level(.debug)
+	lfolder := os.join_path(os.vtmp_dir(), rand.ulid())
+	lpath1 := os.join_path(lfolder, 'current.log')
+	os.mkdir_all(lfolder)!
+	defer {
+		os.rmdir_all(lfolder) or {}
+	}
+	dump(lfolder)
+	mut l := log.Log{}
+	l.set_level(.info)
+	l.set_full_logpath(lpath1)
+	l.set_always_flush(true)
+	l.warn('one warning')
+	l.info('one info message')
+	l.error('one error')
+	l.close()
+	lcontent1 := os.read_file(lpath1)!
+	assert lcontent1.len > 0
+	assert lcontent1.contains('one warning')
+	assert lcontent1.contains('one error')
+	assert lcontent1.contains('one info message')
+}