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File Content: `CachedFileStatTest.cpp`

#include <TestSupport.h>
#include <Utils/CachedFileStat.hpp>
#include <SystemTools/SystemTime.h>
#include <sys/types.h>
#include <utime.h>

using namespace std;
using namespace Passenger;

namespace tut {
	struct CachedFileStatTest: public TestBase {
		struct stat buf;

		~CachedFileStatTest() {
			SystemTime::release();
			unlink("test.txt");
			unlink("test2.txt");
			unlink("test3.txt");
			unlink("test4.txt");
		}
	};

	DEFINE_TEST_GROUP(CachedFileStatTest);

	static void touch(const char *filename, time_t timestamp = 0) {
		FILE *f = fopen(filename, "w");
		fprintf(f, "hi");
		fclose(f);
		if (timestamp != 0) {
			struct utimbuf buf;
			buf.actime = timestamp;
			buf.modtime = timestamp;
			utime(filename, &buf);
		}
	}

	/************ Tests involving a single file ************/

	TEST_METHOD(1) {
		// Statting a new file works.
		touch("test.txt");
		CachedFileStat stat(1);
		ensure_equals(stat.stat("test.txt", &buf, 1), 0);
		ensure_equals((long) buf.st_size, (long) 2);
	}

	TEST_METHOD(2) {
		// It does not re-stat an existing file until the cache has expired.
		CachedFileStat stat(1);

		SystemTime::force(5);
		touch("test.txt", 1);
		ensure_equals("1st stat succceeded",
			stat.stat("test.txt", &buf, 1),
			0);

		touch("test.txt", 1000);
		ensure_equals("2nd stat succceeded",
			stat.stat("test.txt", &buf, 1),
			0);
		ensure_equals("Cached value was used",
			buf.st_mtime,
			(time_t) 1);

		SystemTime::force(6);
		ensure_equals("3rd stat succceeded",
			stat.stat("test.txt", &buf, 1),
			0);
		ensure_equals("Cache has been invalidated",
			buf.st_mtime,
			(time_t) 1000);
	}

	TEST_METHOD(3) {
		// Statting a nonexistant file returns an error.
		CachedFileStat stat(1);
		ensure_equals(stat.stat("test.txt", &buf, 1), -1);
		ensure_equals("It sets errno appropriately", errno, ENOENT);
	}

	TEST_METHOD(4) {
		// It does not re-stat a previously nonexistant file until
		// the cache has expired.
		SystemTime::force(5);
		CachedFileStat stat(1);
		ensure_equals("1st stat failed",
			stat.stat("test.txt", &buf, 1),
			-1);
		ensure_equals("It sets errno appropriately", errno, ENOENT);

		errno = EEXIST;
		touch("test.txt", 1000);
		ensure_equals("2nd stat failed",
			stat.stat("test.txt", &buf, 1),
			-1);
		ensure_equals("It sets errno appropriately", errno, ENOENT);
		ensure_equals("Cached value was used",
			buf.st_mtime,
			(time_t) 0);

		SystemTime::force(6);
		ensure_equals("3rd stat succeeded",
			stat.stat("test.txt", &buf, 1),
			0);
		ensure_equals("Cache has been invalidated",
			buf.st_mtime,
			(time_t) 1000);

		unlink("test.txt");
		ensure_equals("4th stat succeeded even though file was unlinked",
			stat.stat("test.txt", &buf, 1),
			0);
		ensure_equals("Cached value was used",
			buf.st_mtime,
			(time_t) 1000);
	}

	TEST_METHOD(5) {
		// If the throttling rate is 0 then the cache will be bypassed.
		SystemTime::force(5);
		CachedFileStat stat(2);
		ensure_equals("1st stat returns -1",
			stat.stat("test.txt", &buf, 0),
			-1);
		touch("test.txt");
		ensure_equals("2nd stat did not go through the cache",
			stat.stat("test.txt", &buf, 0),
			0);
	}


	/************ Tests involving multiple files ************/

	TEST_METHOD(10) {
		// Throttling in combination with multiple files works.
		CachedFileStat stat(2);
		SystemTime::force(5);

		// Touch and stat test.txt. The next stat should return
		// the old info.

		touch("test.txt", 10);
		ensure_equals(
			stat.stat("test.txt", &buf, 1),
			0);
		ensure_equals(buf.st_mtime, (time_t) 10);

		touch("test.txt", 20);
		ensure_equals(
			stat.stat("test.txt", &buf, 1),
			0);
		ensure_equals(buf.st_mtime, (time_t) 10);

		// Touch and stat test2.txt. The next stat should return
		// the old info.

		touch("test2.txt", 30);
		ensure_equals(
			stat.stat("test2.txt", &buf, 1),
			0);
		ensure_equals(buf.st_mtime, (time_t) 30);

		touch("test2.txt", 40);
		ensure_equals(
			stat.stat("test2.txt", &buf, 1),
			0);
		ensure_equals(buf.st_mtime, (time_t) 30);

		// Forward timer, then stat both files again. The most recent
		// information should be returned.

		SystemTime::force(6);
		ensure_equals(
			stat.stat("test.txt", &buf, 1),
			0);
		ensure_equals(buf.st_mtime, (time_t) 20);
		ensure_equals(
			stat.stat("test2.txt", &buf, 1),
			0);
		ensure_equals(buf.st_mtime, (time_t) 40);
	}

	TEST_METHOD(11) {
		// Cache limiting works.
		CachedFileStat stat(3);
		SystemTime::force(5);

		// Create and stat test.txt, test2.txt and test3.txt.

		touch("test.txt", 1000);
		ensure_equals(
			stat.stat("test.txt", &buf, 1),
			0);
		ensure_equals(buf.st_mtime, (time_t) 1000);

		touch("test2.txt", 1001);
		ensure_equals(
			stat.stat("test2.txt", &buf, 1),
			0);
		ensure_equals(buf.st_mtime, (time_t) 1001);

		touch("test3.txt", 1003);
		ensure_equals(
			stat.stat("test3.txt", &buf, 1),
			0);
		ensure_equals(buf.st_mtime, (time_t) 1003);

		// Stat test2.txt, then create and stat test4.txt, then touch test.txt.
		// test.txt should have been removed from the cache, and thus
		// upon statting it again its new timestamp should be returned.

		ensure_equals(
			stat.stat("test2.txt", &buf, 1),
			0);

		touch("test4.txt", 1004);
		ensure_equals(
			stat.stat("test4.txt", &buf, 1),
			0);

		touch("test.txt", 3000);
		ensure_equals(
			stat.stat("test.txt", &buf, 1),
			0);
		ensure_equals(buf.st_mtime, (time_t) 3000);
	}

	TEST_METHOD(12) {
		// Increasing the cache size dynamically works.
		SystemTime::force(5);
		CachedFileStat stat(2);
		touch("test.txt", 1);
		touch("test2.txt", 2);
		touch("test3.txt", 3);

		ensure_equals("1st stat succeeded",
			stat.stat("test.txt", &buf, 1),
			0);
		ensure_equals("2nd stat succeeded",
			stat.stat("test2.txt", &buf, 1),
			0);
		ensure_equals("3rd stat succeeded",
			stat.stat("test3.txt", &buf, 1),
			0);

		// test.txt should now be removed from the cache.

		touch("test.txt", 10);
		ensure_equals("4th stat succeeded",
			stat.stat("test.txt", &buf, 1),
			0);
		ensure_equals(buf.st_mtime, (time_t) 10);

		// test2.txt should now be removed from the cache.
		// If we stat test2.txt now, test3.txt would normally
		// be removed from the cache. But if we increase the
		// cache size here then that won't happen:
		stat.setMaxSize(3);
		touch("test2.txt", 11);
		touch("test3.txt", 12);

		ensure_equals("5th stat succeeded",
			stat.stat("test2.txt", &buf, 1),
			0);
		ensure_equals(buf.st_mtime, (time_t) 11);

		ensure_equals("6th stat succeeded",
			stat.stat("test3.txt", &buf, 1),
			0);
		ensure_equals("test3.txt is still cached",
			buf.st_mtime,
			(time_t) 3);

		ensure_equals("7th stat succeeded",
			stat.stat("test.txt", &buf, 1),
			0);
		ensure_equals("test.txt is still cached",
			buf.st_mtime,
			(time_t) 10);
	}

	TEST_METHOD(13) {
		// If we decrease the cache size dynamically, then
		// the oldest entries will be removed.
		SystemTime::force(5);
		CachedFileStat stat(3);
		touch("test.txt", 1);
		touch("test2.txt", 2);
		touch("test3.txt", 3);

		ensure_equals("1st stat succeeded",
			stat.stat("test.txt", &buf, 1),
			0);
		ensure_equals("2nd stat succeeded",
			stat.stat("test2.txt", &buf, 1),
			0);
		ensure_equals("3rd stat succeeded",
			stat.stat("test3.txt", &buf, 1),
			0);

		// The following should remove test.txt and test2.txt from the cache.
		stat.setMaxSize(1);

		touch("test.txt", 10);
		touch("test2.txt", 11);
		touch("test3.txt", 12);

		ensure_equals("6th stat succeeded",
			stat.stat("test3.txt", &buf, 1),
			0);
		ensure_equals("test3.txt is still in the cache",
			buf.st_mtime,
			(time_t) 3);

		ensure_equals("4th stat succeeded",
			stat.stat("test.txt", &buf, 1),
			0);
		ensure_equals("test.txt is removed from the cache",
			buf.st_mtime,
			(time_t) 10);

		ensure_equals("5th stat succeeded",
			stat.stat("test2.txt", &buf, 1),
			0);
		ensure_equals("test2.txt is removed from the cache",
			buf.st_mtime,
			(time_t) 11);
	}

	TEST_METHOD(14) {
		// An initial cache size of 0 means that the cache size is unlimited.
		SystemTime::force(1);
		CachedFileStat stat(0);

		touch("test.txt", 1);
		touch("test2.txt", 2);
		touch("test3.txt", 3);
		stat.stat("test.txt", &buf, 1);
		stat.stat("test2.txt", &buf, 1);
		stat.stat("test3.txt", &buf, 1);

		touch("test.txt", 11);
		touch("test2.txt", 12);
		touch("test3.txt", 13);
		stat.stat("test.txt", &buf, 1);
		ensure_equals(buf.st_mtime, (time_t) 1);
		stat.stat("test2.txt", &buf, 1);
		ensure_equals(buf.st_mtime, (time_t) 2);
		stat.stat("test3.txt", &buf, 1);
		ensure_equals(buf.st_mtime, (time_t) 3);
	}

	TEST_METHOD(15) {
		// Setting the cache size dynamically to 0 makes the cache size unlimited.
		SystemTime::force(1);
		CachedFileStat stat(2);

		touch("test.txt", 1);
		touch("test2.txt", 2);
		touch("test3.txt", 3);
		stat.stat("test.txt", &buf, 1);
		stat.stat("test2.txt", &buf, 1);
		stat.stat("test3.txt", &buf, 1);

		// test.txt is now no longer in the cache.

		stat.setMaxSize(0);
		touch("test.txt", 11);
		touch("test2.txt", 12);
		touch("test3.txt", 13);
		stat.stat("test.txt", &buf, 1);
		stat.stat("test2.txt", &buf, 1);
		stat.stat("test3.txt", &buf, 1);

		// test.txt should now have been re-statted while test2.txt
		// and test3.txt are still cached.

		stat.stat("test.txt", &buf, 1);
		ensure_equals("test.txt is re-statted", buf.st_mtime, (time_t) 11);
		stat.stat("test2.txt", &buf, 1);
		ensure_equals("test2.txt is still cached", buf.st_mtime, (time_t) 2);
		stat.stat("test3.txt", &buf, 1);
		ensure_equals("test3.txt is still cached", buf.st_mtime, (time_t) 3);
	}

	TEST_METHOD(16) {
		// Changing the cache size dynamically from 0 to non-0 works;
		// it removes the oldest entries, if necessary.
		CachedFileStat stat(0);
		stat.stat("test.txt", &buf, 1);
		stat.stat("test2.txt", &buf, 1);
		stat.stat("test3.txt", &buf, 1);
		stat.stat("test4.txt", &buf, 1);
		stat.stat("test5.txt", &buf, 1);
		stat.setMaxSize(2);
		ensure("(1)", !stat.knows("test.txt"));
		ensure("(2)", !stat.knows("test2.txt"));
		ensure("(3)", !stat.knows("test3.txt"));
		ensure("(4)", stat.knows("test4.txt"));
		ensure("(5)", stat.knows("test5.txt"));
	}
}
Name	Size	Permission
ConfigKit	---	0755
Core	---	0755
DataStructures	---	0755
FileTools	---	0755
IOTools	---	0755
MemoryKit	---	0755
ServerKit	---	0755
StrIntTools	---	0755
SystemTools	---	0755
Base64DecodingTest.cpp	706 bytes	0644
CachedFileStatTest.cpp	10123 bytes	0644
CxxTestMain.cpp	6023 bytes	0644
DateParsingTest.cpp	3555 bytes	0644
FileChangeCheckerTest.cpp	9474 bytes	0644
FileDescriptorTest.cpp	1505 bytes	0644
MessagePassingTest.cpp	2153 bytes	0644
SpawnEnvSetupperTest.cpp	14631 bytes	0644
StaticStringTest.cpp	6683 bytes	0644
TestSupport.cpp	3063 bytes	0644
TestSupport.h	7321 bytes	0644
UtilsTest.cpp	23527 bytes	0644
VariantMapTest.cpp	5494 bytes	0644
File Content: CachedFileStatTest.cpp

File Content: `CachedFileStatTest.cpp`
