Remove dead code from FirebaseRemoteConfig (#14153)

FirebaseRemoteConfig/Sources/Private/RCNConfigSettings.h

@@ -55,11 +55,6 @@
 /// Custom variable (aka App context digest). This is the pending custom variables request before
 /// fetching.
 @property(nonatomic, copy) NSDictionary *customVariables;
-/// Cached internal metadata from internal metadata table. It contains customized information such
-/// as HTTP connection timeout, HTTP read timeout, success/failure throttling rate and time
-/// interval. Client has the default value of each parameters, they are only saved in
-/// internalMetadata if they have been customize by developers.
-@property(nonatomic, readonly, copy) NSDictionary *internalMetadata;
 /// Device conditions since last successful fetch from the backend. Device conditions including
 /// app
 /// version, iOS version, device localte, language, GMP project ID and Game project ID. Used for
@@ -122,9 +117,6 @@
 /// Returns metadata from metadata table.
 - (NSDictionary *)loadConfigFromMetadataTable;
 
-/// Updates internal content with the latest successful config response.
-- (void)updateInternalContentWithResponse:(NSDictionary *)response;
-
 /// Updates the metadata table with the current fetch status.
 /// @param fetchSuccess True if fetch was successful.
 - (void)updateMetadataWithFetchSuccessStatus:(BOOL)fetchSuccess

FirebaseRemoteConfig/Sources/RCNConfigDBManager.h

@@ -70,10 +70,6 @@ typedef void (^RCNDBLoadCompletion)(BOOL success,
 /// start. Config settings include success/failure fetch times, device contenxt, app context, etc.
 - (NSDictionary *)loadMetadataWithBundleIdentifier:(NSString *)bundleIdentifier
                                          namespace:(NSString *)namespace;
-/// Load internal metadata from internal metadata table, such as customized HTTP connection/read
-/// timeout, throttling time interval and number limit of throttling, etc.
-/// This call needs to be blocking to ensure throttling works during apps starts.
-- (NSDictionary *)loadInternalMetadataTable;
 /// Load experiment from experiment table.
 /// @param handler    The callback when reading from DB is complete.
 - (void)loadExperimentWithCompletionHandler:(RCNDBCompletion)handler;
@@ -90,10 +86,6 @@ typedef void (^RCNDBLoadCompletion)(BOOL success,
 - (void)insertMainTableWithValues:(NSArray *)values
                        fromSource:(RCNDBSource)source
                 completionHandler:(RCNDBCompletion)handler;
-/// Insert a record in internal metadata table.
-/// @param values Values to be inserted.
-- (void)insertInternalMetadataTableWithValues:(NSArray *)values
-                            completionHandler:(RCNDBCompletion)handler;
 /// Insert experiment data in experiment table.
 /// @param key        The key of experiment data belongs to, which are defined in
 ///                   RCNConfigDefines.h.
@@ -125,11 +117,10 @@ typedef void (^RCNDBLoadCompletion)(BOOL success,
 - (void)deleteRecordFromMainTableWithNamespace:(NSString *)namespace_p
                               bundleIdentifier:(NSString *)bundleIdentifier
                                     fromSource:(RCNDBSource)source;
-/// Remove all the records of given package name and namespace from metadata/internal metadata DB
+/// Remove all the records of given package name and namespace from metadata DB
 /// before updating new values from response.
 - (void)deleteRecordWithBundleIdentifier:(NSString *)bundlerIdentifier
-                               namespace:(NSString *)namespace
-                            isInternalDB:(BOOL)isInternalDB;
+                               namespace:(NSString *)namespace;
 /// Remove all the records from a config content table.
 - (void)deleteAllRecordsFromTableWithSource:(RCNDBSource)source;
 

FirebaseRemoteConfig/Sources/RCNConfigDBManager.m

@@ -28,7 +28,6 @@
 #define RCNTableNameMainDefault "main_default"
 #define RCNTableNameMetadataDeprecated "fetch_metadata"
 #define RCNTableNameMetadata "fetch_metadata_v2"
-#define RCNTableNameInternalMetadata "internal_metadata"
 #define RCNTableNameExperiment "experiment"
 #define RCNTableNamePersonalization "personalization"
 #define RCNTableNameRollout "rollout"
@@ -278,10 +277,6 @@ - (BOOL)createTableSchema {
       "success_fetch_time BLOB, failure_fetch_time BLOB, last_fetch_status INTEGER, "
       "last_fetch_error INTEGER, last_apply_time INTEGER, last_set_defaults_time INTEGER)";
 
-  static const char *createTableInternalMetadata =
-      "create TABLE IF NOT EXISTS " RCNTableNameInternalMetadata
-      " (_id INTEGER PRIMARY KEY, key TEXT, value BLOB)";
-
   static const char *createTableExperiment = "create TABLE IF NOT EXISTS " RCNTableNameExperiment
                                              " (_id INTEGER PRIMARY KEY, key TEXT, value BLOB)";
   static const char *createTablePersonalization =
@@ -293,7 +288,6 @@ - (BOOL)createTableSchema {
 
   return [self executeQuery:createTableMain] && [self executeQuery:createTableMainActive] &&
          [self executeQuery:createTableMainDefault] && [self executeQuery:createTableMetadata] &&
-         [self executeQuery:createTableInternalMetadata] &&
          [self executeQuery:createTableExperiment] &&
          [self executeQuery:createTablePersonalization] && [self executeQuery:createTableRollout];
 }
@@ -471,48 +465,6 @@ - (BOOL)insertMainTableWithValues:(NSArray *)values fromSource:(RCNDBSource)sour
   return YES;
 }
 
-- (void)insertInternalMetadataTableWithValues:(NSArray *)values
-                            completionHandler:(RCNDBCompletion)handler {
-  __weak RCNConfigDBManager *weakSelf = self;
-  dispatch_async(_databaseOperationQueue, ^{
-    BOOL success = [weakSelf insertInternalMetadataWithValues:values];
-    if (handler) {
-      dispatch_async(dispatch_get_main_queue(), ^{
-        handler(success, nil);
-      });
-    }
-  });
-}
-
-- (BOOL)insertInternalMetadataWithValues:(NSArray *)values {
-  RCN_MUST_NOT_BE_MAIN_THREAD();
-  if (values.count != 2) {
-    return NO;
-  }
-  const char *SQL =
-      "INSERT OR REPLACE INTO " RCNTableNameInternalMetadata " (key, value) values (?, ?)";
-  sqlite3_stmt *statement = [self prepareSQL:SQL];
-  if (!statement) {
-    return NO;
-  }
-  NSString *aString = values[0];
-  if (![self bindStringToStatement:statement index:1 string:aString]) {
-    [self logErrorWithSQL:SQL finalizeStatement:statement returnValue:NO];
-    return NO;
-  }
-  NSData *blobData = values[1];
-  if (sqlite3_bind_blob(statement, 2, blobData.bytes, (int)blobData.length, NULL) != SQLITE_OK) {
-    [self logErrorWithSQL:SQL finalizeStatement:statement returnValue:NO];
-    return NO;
-  }
-  if (sqlite3_step(statement) != SQLITE_DONE) {
-    [self logErrorWithSQL:SQL finalizeStatement:statement returnValue:NO];
-    return NO;
-  }
-  sqlite3_finalize(statement);
-  return YES;
-}
-
 - (void)insertExperimentTableWithKey:(NSString *)key
                                value:(NSData *)serializedValue
                    completionHandler:(RCNDBCompletion)handler {
@@ -1039,34 +991,6 @@ - (NSData *)loadPersonalizationTableFromKey:(int)key {
   return results[0];
 }
 
-- (NSDictionary *)loadInternalMetadataTable {
-  __block NSMutableDictionary *internalMetadataTableResult;
-  __weak RCNConfigDBManager *weakSelf = self;
-  dispatch_sync(_databaseOperationQueue, ^{
-    internalMetadataTableResult = [weakSelf loadInternalMetadataTableInternal];
-  });
-  return internalMetadataTableResult;
-}
-
-- (NSMutableDictionary *)loadInternalMetadataTableInternal {
-  NSMutableDictionary *internalMetadata = [[NSMutableDictionary alloc] init];
-  const char *SQL = "SELECT key, value FROM " RCNTableNameInternalMetadata;
-  sqlite3_stmt *statement = [self prepareSQL:SQL];
-  if (!statement) {
-    return nil;
-  }
-
-  while (sqlite3_step(statement) == SQLITE_ROW) {
-    NSString *key = [[NSString alloc] initWithUTF8String:(char *)sqlite3_column_text(statement, 0)];
-
-    NSData *dataValue = [NSData dataWithBytes:(char *)sqlite3_column_blob(statement, 1)
-                                       length:sqlite3_column_bytes(statement, 1)];
-    internalMetadata[key] = dataValue;
-  }
-  sqlite3_finalize(statement);
-  return internalMetadata;
-}
-
 /// This method is only meant to be called at init time. The underlying logic will need to be
 /// reevaluated if the assumption changes at a later time.
 - (void)loadMainWithBundleIdentifier:(NSString *)bundleIdentifier
@@ -1178,20 +1102,16 @@ - (void)deleteRecordFromMainTableWithNamespace:(NSString *)namespace_p
 }
 
 - (void)deleteRecordWithBundleIdentifier:(NSString *)bundleIdentifier
-                               namespace:(NSString *)namespace
-                            isInternalDB:(BOOL)isInternalDB {
+                               namespace:(NSString *)namespace {
   __weak RCNConfigDBManager *weakSelf = self;
   dispatch_async(_databaseOperationQueue, ^{
     RCNConfigDBManager *strongSelf = weakSelf;
     if (!strongSelf) {
       return;
     }
-    const char *SQL = "DELETE FROM " RCNTableNameInternalMetadata " WHERE key LIKE ?";
-    NSArray *params = @[ bundleIdentifier ];
-    if (!isInternalDB) {
-      SQL = "DELETE FROM " RCNTableNameMetadata " WHERE bundle_identifier = ? and namespace = ?";
-      params = @[ bundleIdentifier, namespace ];
-    }
+    const char *SQL =
+        "DELETE FROM " RCNTableNameMetadata " WHERE bundle_identifier = ? and namespace = ?";
+    NSArray *params = @[ bundleIdentifier, namespace ];
     [strongSelf executeQuery:SQL withParams:params];
   });
 }

FirebaseRemoteConfig/Sources/RCNConfigSettings.m

@@ -45,11 +45,6 @@ @interface RCNConfigSettings () {
   /// Custom variables (aka App context digest). This is the pending custom variables request before
   /// fetching.
   NSMutableDictionary *_customVariables;
-  /// Cached internal metadata from internal metadata table. It contains customized information such
-  /// as HTTP connection timeout, HTTP read timeout, success/failure throttling rate and time
-  /// interval. Client has the default value of each parameters, they are only saved in
-  /// internalMetadata if they have been customize by developers.
-  NSMutableDictionary *_internalMetadata;
   /// Last fetch status.
   FIRRemoteConfigFetchStatus _lastFetchStatus;
   /// Last fetch Error.
@@ -66,8 +61,6 @@ @interface RCNConfigSettings () {
   NSString *_googleAppID;
   /// The user defaults manager scoped to this RC instance of FIRApp and namespace.
   RCNUserDefaultsManager *_userDefaultsManager;
-  /// The timestamp of last eTag update.
-  NSTimeInterval _lastETagUpdateTime;
 }
 @end
 
@@ -93,11 +86,6 @@ - (instancetype)initWithDatabaseManager:(RCNConfigDBManager *)manager
     _successFetchTimes = [[NSMutableArray alloc] init];
     _failureFetchTimes = [[NSMutableArray alloc] init];
     _DBManager = manager;
-
-    _internalMetadata = [[_DBManager loadInternalMetadataTable] mutableCopy];
-    if (!_internalMetadata) {
-      _internalMetadata = [[NSMutableDictionary alloc] init];
-    }
     _userDefaultsManager = [[RCNUserDefaultsManager alloc] initWithAppName:appName
                                                                   bundleID:_bundleIdentifier
                                                                  namespace:_FIRNamespace];
@@ -184,32 +172,6 @@ - (NSDictionary *)loadConfigFromMetadataTable {
 }
 
 #pragma mark - update DB/cached
-
-// Update internal metadata content to cache and DB.
-- (void)updateInternalContentWithResponse:(NSDictionary *)response {
-  // Remove all the keys with current package name.
-  [_DBManager deleteRecordWithBundleIdentifier:_bundleIdentifier
-                                     namespace:_FIRNamespace
-                                  isInternalDB:YES];
-
-  for (NSString *key in _internalMetadata.allKeys) {
-    if ([key hasPrefix:_bundleIdentifier]) {
-      [_internalMetadata removeObjectForKey:key];
-    }
-  }
-
-  for (NSString *entry in response) {
-    NSData *val = [response[entry] dataUsingEncoding:NSUTF8StringEncoding];
-    NSArray *values = @[ entry, val ];
-    _internalMetadata[entry] = response[entry];
-    [self updateInternalMetadataTableWithValues:values];
-  }
-}
-
-- (void)updateInternalMetadataTableWithValues:(NSArray *)values {
-  [_DBManager insertInternalMetadataTableWithValues:values completionHandler:nil];
-}
-
 /// If the last fetch was not successful, update the (exponential backoff) period that we wait until
 /// fetching again. Any subsequent fetch requests will be checked and allowed only if past this
 /// throttle end time.
@@ -310,9 +272,7 @@ - (void)updateFetchTimeWithSuccessFetch:(BOOL)isSuccessfulFetch {
 }
 
 - (void)updateMetadataTable {
-  [_DBManager deleteRecordWithBundleIdentifier:_bundleIdentifier
-                                     namespace:_FIRNamespace
-                                  isInternalDB:NO];
+  [_DBManager deleteRecordWithBundleIdentifier:_bundleIdentifier namespace:_FIRNamespace];
   NSError *error;
   // Objects to be serialized cannot be invalid.
   if (!_bundleIdentifier) {
@@ -472,10 +432,6 @@ - (NSDictionary *)customVariables {
   return [_customVariables copy];
 }
 
-- (NSDictionary *)internalMetadata {
-  return [_internalMetadata copy];
-}
-
 - (NSDictionary *)deviceContext {
   return [_deviceContext copy];
 }

FirebaseRemoteConfig/Tests/Unit/RCNConfigDBManagerTest.m

@@ -155,39 +155,6 @@ - (void)testWriteAndLoadMainTableResult {
                                }];
 }
 
-- (void)testWriteAndLoadInternalMetadataResult {
-  XCTestExpectation *loadConfigContentExpectation = [self
-      expectationWithDescription:@"Write and read internal metadata in database successfully"];
-  __block int count = 0;
-  for (int i = 0; i <= 100; ++i) {
-    // check DB write correctly
-    RCNDBCompletion insertCompletion = ^void(BOOL success, NSDictionary *result) {
-      count++;
-      XCTAssertTrue(success);
-      if (count == 100) {
-        // check DB read correctly
-        NSDictionary *result = [self->_DBManager loadInternalMetadataTable];
-        NSString *stringValue = [[NSString alloc] initWithData:result[@"key100"]
-                                                      encoding:NSUTF8StringEncoding];
-        XCTAssertEqualObjects(stringValue, @"value100");
-        if (success) {
-          [loadConfigContentExpectation fulfill];
-        }
-      }
-    };
-    NSString *value = [NSString stringWithFormat:@"value%d", i];
-    NSString *key = [NSString stringWithFormat:@"key%d", i];
-
-    NSArray *values = @[ key, [value dataUsingEncoding:NSUTF8StringEncoding] ];
-    [_DBManager insertInternalMetadataTableWithValues:values completionHandler:insertCompletion];
-  }
-
-  [self waitForExpectationsWithTimeout:_expectionTimeout
-                               handler:^(NSError *error) {
-                                 XCTAssertNil(error);
-                               }];
-}
-
 - (void)testWriteAndLoadMetadataResult {
   XCTestExpectation *writeAndLoadMetadataExpectation =
       [self expectationWithDescription:@"Write and load metadata in database successfully"];