Tests for ManifestDumpCommand and ListColumnFamiliesCommand

Summary:
Added tests for two LDBCommands namely i) ManifestDumpCommand and ii) ListColumnFamiliesCommand.
+ Minor fix in the sscanf formatter (along relace C cast with C++ cast) + replacing localtime with localtime_r which is thread safe.

Test Plan: make all && ./tools/ldb_test.py

Reviewers: anthony, igor, IslamAbdelRahman, kradhakrishnan, lgalanis, rven, sdong

Reviewed By: sdong

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D45819

tools/ldb_test.py

 import os
+import glob
 import os.path
 import shutil
 import subprocess
 import time
 import unittest
 import tempfile
+import re
 
 def my_check_output(*popenargs, **kwargs):
     """
@@ -43,7 +45,8 @@ class LDBTestCase(unittest.TestCase):
     def dbParam(self, dbName):
         return "--db=%s" % os.path.join(self.TMP_DIR, dbName)
 
-    def assertRunOKFull(self, params, expectedOutput, unexpected=False):
+    def assertRunOKFull(self, params, expectedOutput, unexpected=False,
+                        isPattern=False):
         """
         All command-line params must be specified.
         Allows full flexibility in testing; for example: missing db param.
@@ -53,9 +56,16 @@ class LDBTestCase(unittest.TestCase):
         output = my_check_output("./ldb %s |grep -v \"Created bg thread\"" %
                             params, shell=True)
         if not unexpected:
-            self.assertEqual(output.strip(), expectedOutput.strip())
+            if isPattern:
+                self.assertNotEqual(expectedOutput.search(output.strip()),
+                                    None)
+            else:
+                self.assertEqual(output.strip(), expectedOutput.strip())
         else:
-            self.assertNotEqual(output.strip(), expectedOutput.strip())
+            if isPattern:
+                self.assertEqual(expectedOutput.search(output.strip()), None)
+            else:
+                self.assertNotEqual(output.strip(), expectedOutput.strip())
 
     def assertRunFAILFull(self, params):
         """
@@ -395,5 +405,52 @@ class LDBTestCase(unittest.TestCase):
         dumpFilePath = os.path.join(self.TMP_DIR, "dump2")
         self.assertTrue(self.dumpLiveFiles("--db=%s" % dbPath, dumpFilePath))
 
+    def getManifests(self, directory):
+        return glob.glob(directory + "/MANIFEST-*")
+
+    def copyManifests(self, src, dest):
+        return 0 == run_err_null("cp " + src + " " + dest)
+
+    def testManifestDump(self):
+        print "Running testManifestDump..."
+        dbPath = os.path.join(self.TMP_DIR, self.DB_NAME)
+        self.assertRunOK("put 1 1 --create_if_missing", "OK")
+        self.assertRunOK("put 2 2", "OK")
+        self.assertRunOK("put 3 3", "OK")
+        # Pattern to expect from manifest_dump.
+        num = "[0-9]+"
+        st = ".*"
+        subpat = st + " @ " + num + ": " + num
+        regex = num + ":" + num + "\[" + subpat + ".." + subpat + "\]"
+        expected_pattern = re.compile(regex)
+        cmd = "manifest_dump --db=%s"
+        manifest_files = self.getManifests(dbPath)
+        self.assertTrue(len(manifest_files) == 1)
+        # Test with the default manifest file in dbPath.
+        self.assertRunOKFull(cmd % dbPath, expected_pattern,
+                             unexpected=False, isPattern=True)
+        self.copyManifests(manifest_files[0], manifest_files[0] + "1")
+        manifest_files = self.getManifests(dbPath)
+        self.assertTrue(len(manifest_files) == 2)
+        # Test with multiple manifest files in dbPath.
+        self.assertRunFAILFull(cmd % dbPath)
+        # Running it with the copy we just created should pass.
+        self.assertRunOKFull((cmd + " --path=%s")
+                             % (dbPath, manifest_files[1]),
+                             expected_pattern, unexpected=False,
+                             isPattern=True)
+
+    def testListColumnFamilies(self):
+        print "Running testListColumnFamilies..."
+        dbPath = os.path.join(self.TMP_DIR, self.DB_NAME)
+        self.assertRunOK("put x1 y1 --create_if_missing", "OK")
+        cmd = "list_column_families %s | grep -v \"Column families\""
+        # Test on valid dbPath.
+        self.assertRunOKFull(cmd % dbPath, "{default}")
+        # Test on empty path.
+        self.assertRunFAILFull(cmd % "")
+
+
+
 if __name__ == "__main__":
     unittest.main()

util/ldb_cmd.cc

@@ -608,12 +608,9 @@ void ManifestDumpCommand::DoCommand() {
     struct dirent* entry;
     while ((entry = readdir(d.get())) != nullptr) {
       unsigned int match;
-      unsigned long long num;
-      if (sscanf(entry->d_name,
-                 "MANIFEST-%ln%ln",
-                 (unsigned long*)&num,
-                 (unsigned long*)&match)
-          && match == strlen(entry->d_name)) {
+      uint64_t num;
+      if (sscanf(entry->d_name, "MANIFEST-%lu%n", &num, &match) &&
+          match == strlen(entry->d_name)) {
         if (!found) {
           manifestfile = db_path_ + "/" + std::string(entry->d_name);
           found = true;
@@ -686,7 +683,9 @@ namespace {
 string ReadableTime(int unixtime) {
   char time_buffer [80];
   time_t rawtime = unixtime;
-  struct tm * timeinfo = localtime(&rawtime);
+  struct tm tInfo;
+  struct tm* timeinfo = localtime_r(&rawtime, &tInfo);
+  assert(timeinfo == &tInfo);
   strftime(time_buffer, 80, "%c", timeinfo);
   return string(time_buffer);
 }