santad: add prefixes on a background thread (#444)

* add prefixes on a background thread

* version bump

.travis.yml

@@ -8,6 +8,7 @@ addons:
   homebrew:
     taps: bazelbuild/tap
     packages: bazelbuild/tap/bazel
+    update: true
 
 script:
  - bazel build :release --show_progress_rate_limit=30.0 -c opt --apple_generate_dsym --color=no --verbose_failures --sandbox_debug

Source/santad/EventProviders/SNTDriverManager.m

@@ -310,6 +310,8 @@ static void driverAppearedHandler(void *info, io_iterator_t iterator) {
 }
 
 - (void)fileModificationPrefixFilterAdd:(NSArray *)filters {
+  while (!self.connectionEstablished) usleep(100000); // 100ms
+
   uint64_t n = 0;
   uint32_t n_len = 1;
 
@@ -334,6 +336,8 @@ static void driverAppearedHandler(void *info, io_iterator_t iterator) {
         LOGE(@"Prefix filter tree is full!");
         return;
       }
+    } else {
+      LOGI(@"Added prefix filter: %s", buffer);
     }
   }
 }

Source/santad/SNTApplication.m

@@ -93,12 +93,14 @@
         break;
     }
 
-    // The filter is reset when santad disconnects from the driver.
-    // Add the default filters.
-    [_eventProvider fileModificationPrefixFilterAdd:@[ @"/.", @"/dev/" ]];
+    dispatch_async(dispatch_get_global_queue(QOS_CLASS_BACKGROUND, 0), ^{
+      // The filter is reset when santad disconnects from the driver.
+      // Add the default filters.
+      [self.eventProvider fileModificationPrefixFilterAdd:@[ @"/.", @"/dev/" ]];
 
-    // TODO(bur): Add KVO handling for fileChangesPrefixFilters.
-    [_eventProvider fileModificationPrefixFilterAdd:[configurator fileChangesPrefixFilters]];
+      // TODO(bur): Add KVO handling for fileChangesPrefixFilters.
+      [self.eventProvider fileModificationPrefixFilterAdd:[configurator fileChangesPrefixFilters]];
+    });
 
     self.notQueue = [[SNTNotificationQueue alloc] init];
     SNTSyncdQueue *syncdQueue = [[SNTSyncdQueue alloc] init];

version.bzl

@@ -1,3 +1,3 @@
 """The version for all Santa components."""
 
-SANTA_VERSION = "1.4"
+SANTA_VERSION = "1.6"