react-native-firebase/ios/RNFirebase/database/RNFirebaseDatabase.m

529 lines
20 KiB
Objective-C

#import "RNFirebaseDatabase.h"
#import "RNFirebaseEvents.h"
#import "Firebase.h"
#if __has_include(<FirebaseDatabase/FIRDatabase.h>)
@interface RNFirebaseDBReference : NSObject
@property RCTEventEmitter *emitter;
@property FIRDatabaseQuery *query;
@property NSNumber *refId;
@property NSString *path;
@property NSMutableDictionary *listeners;
+ (NSDictionary *)snapshotToDict:(FIRDataSnapshot *)snapshot;
@end
@implementation RNFirebaseDBReference
- (id)initWithPathAndModifiers:(RCTEventEmitter *)emitter database:(FIRDatabase *)database refId:(NSNumber *)refId path:(NSString *)path modifiers:(NSArray *)modifiers {
self = [super init];
if (self) {
_emitter = emitter;
_refId = refId;
_path = path;
_query = [self buildQueryAtPathWithModifiers:database path:path modifiers:modifiers];
_listeners = [[NSMutableDictionary alloc] init];
}
return self;
}
- (void)addEventHandler:(NSNumber *)listenerId eventName:(NSString *)eventName {
if (!_listeners[listenerId]) {
id andPreviousSiblingKeyWithBlock = ^(FIRDataSnapshot *_Nonnull snapshot, NSString *_Nullable previousChildName) {
NSDictionary *props = [RNFirebaseDBReference snapshotToDict:snapshot];
[self sendJSEvent:DATABASE_DATA_EVENT title:eventName props:@{
@"eventName": eventName,
@"refId": _refId,
@"listenerId": listenerId,
@"path": _path,
@"snapshot": props,
@"previousChildName": previousChildName != nil ? previousChildName : [NSNull null]
}];
};
id errorBlock = ^(NSError *_Nonnull error) {
NSLog(@"Error onDBEvent: %@", [error debugDescription]);
[self removeEventHandler:listenerId eventName:eventName];
[self getAndSendDatabaseError:error listenerId:listenerId];
};
int eventType = [self eventTypeFromName:eventName];
FIRDatabaseHandle handle = [_query observeEventType:eventType andPreviousSiblingKeyWithBlock:andPreviousSiblingKeyWithBlock withCancelBlock:errorBlock];
_listeners[listenerId] = @(handle);
} else {
NSLog(@"Warning Trying to add duplicate listener for refId: %@ listenerId: %@", _refId, listenerId);
}
}
- (void)addSingleEventHandler:(RCTResponseSenderBlock)callback {
[_query observeSingleEventOfType:FIRDataEventTypeValue andPreviousSiblingKeyWithBlock:^(FIRDataSnapshot *_Nonnull snapshot, NSString *_Nullable previousChildName) {
NSDictionary *props = [RNFirebaseDBReference snapshotToDict:snapshot];
callback(@[[NSNull null], @{
@"eventName": @"value",
@"path": _path,
@"refId": _refId,
@"snapshot": props,
@"previousChildName": previousChildName != nil ? previousChildName : [NSNull null]
}]);
} withCancelBlock:^(NSError *_Nonnull error) {
NSLog(@"Error onDBEventOnce: %@", [error debugDescription]);
callback(@[@{@"eventName": DATABASE_ERROR_EVENT, @"path": _path, @"refId": _refId, @"code": @([error code]), @"details": [error debugDescription], @"message": [error localizedDescription], @"description": [error description]}]);
}];
}
- (void)removeEventHandler:(NSNumber *)listenerId eventName:(NSString *)eventName {
FIRDatabaseHandle handle = (FIRDatabaseHandle) [_listeners[listenerId] integerValue];
if (handle) {
[_listeners removeObjectForKey:listenerId];
[_query removeObserverWithHandle:handle];
}
}
+ (NSDictionary *)snapshotToDict:(FIRDataSnapshot *)snapshot {
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
[dict setValue:snapshot.key forKey:@"key"];
NSDictionary *val = snapshot.value;
dict[@"value"] = val;
// Snapshot ordering
NSMutableArray *childKeys = [NSMutableArray array];
if (snapshot.childrenCount > 0) {
// Since JS does not respect object ordering of keys
// we keep a list of the keys and their ordering
// in the snapshot event
NSEnumerator *children = [snapshot children];
FIRDataSnapshot *child;
while (child = [children nextObject]) {
[childKeys addObject:child.key];
}
}
dict[@"childKeys"] = childKeys;
[dict setValue:@(snapshot.hasChildren) forKey:@"hasChildren"];
[dict setValue:@(snapshot.exists) forKey:@"exists"];
[dict setValue:@(snapshot.childrenCount) forKey:@"childrenCount"];
[dict setValue:snapshot.priority forKey:@"priority"];
return dict;
}
- (NSDictionary *)getAndSendDatabaseError:(NSError *)error listenerId:(NSNumber *)listenerId {
NSDictionary *event = @{@"eventName": DATABASE_ERROR_EVENT, @"path": _path, @"refId": _refId, @"listenerId": listenerId, @"code": @([error code]), @"details": [error debugDescription], @"message": [error localizedDescription], @"description": [error description]};
@try {
[_emitter sendEventWithName:DATABASE_ERROR_EVENT body:event];
} @catch (NSException *err) {
NSLog(@"An error occurred in getAndSendDatabaseError: %@", [err debugDescription]);
NSLog(@"Tried to send: %@ with %@", DATABASE_ERROR_EVENT, event);
}
return event;
}
- (void)sendJSEvent:(NSString *)type title:(NSString *)title props:(NSDictionary *)props {
@try {
[_emitter sendEventWithName:type body:@{@"eventName": title, @"body": props}];
} @catch (NSException *err) {
NSLog(@"An error occurred in sendJSEvent: %@", [err debugDescription]);
NSLog(@"Tried to send: %@ with %@", title, props);
}
}
- (FIRDatabaseQuery *)buildQueryAtPathWithModifiers:(FIRDatabase *)database path:(NSString *)path modifiers:(NSArray *)modifiers {
FIRDatabaseQuery *query = [[database reference] child:path];
for (NSDictionary *modifier in modifiers) {
NSString *type = [modifier valueForKey:@"type"];
NSString *name = [modifier valueForKey:@"name"];
if ([type isEqualToString:@"orderBy"]) {
if ([name isEqualToString:@"orderByKey"]) {
query = [query queryOrderedByKey];
} else if ([name isEqualToString:@"orderByPriority"]) {
query = [query queryOrderedByPriority];
} else if ([name isEqualToString:@"orderByValue"]) {
query = [query queryOrderedByValue];
} else if ([name isEqualToString:@"orderByChild"]) {
NSString *key = [modifier valueForKey:@"key"];
query = [query queryOrderedByChild:key];
}
} else if ([type isEqualToString:@"limit"]) {
int limit = [[modifier valueForKey:@"limit"] integerValue];
if ([name isEqualToString:@"limitToLast"]) {
query = [query queryLimitedToLast:limit];
} else if ([name isEqualToString:@"limitToFirst"]) {
query = [query queryLimitedToFirst:limit];
}
} else if ([type isEqualToString:@"filter"]) {
NSString *valueType = [modifier valueForKey:@"valueType"];
NSString *key = [modifier valueForKey:@"key"];
id value = [self getIdValue:[modifier valueForKey:@"value"] type:valueType];
if ([name isEqualToString:@"equalTo"]) {
if (key != nil) {
query = [query queryEqualToValue:value childKey:key];
} else {
query = [query queryEqualToValue:value];
}
} else if ([name isEqualToString:@"endAt"]) {
if (key != nil) {
query = [query queryEndingAtValue:value childKey:key];
} else {
query = [query queryEndingAtValue:value];
}
} else if ([name isEqualToString:@"startAt"]) {
if (key != nil) {
query = [query queryStartingAtValue:value childKey:key];
} else {
query = [query queryStartingAtValue:value];
}
}
}
}
return query;
}
- (id)getIdValue:(NSString *)value type:(NSString *)type {
if ([type isEqualToString:@"number"]) {
return @(value.doubleValue);
} else if ([type isEqualToString:@"boolean"]) {
return @(value.boolValue);
} else {
return value;
}
}
- (BOOL)hasListeners {
return [[_listeners allKeys] count] > 0;
}
- (int)eventTypeFromName:(NSString *)name {
int eventType = FIRDataEventTypeValue;
if ([name isEqualToString:DATABASE_VALUE_EVENT]) {
eventType = FIRDataEventTypeValue;
} else if ([name isEqualToString:DATABASE_CHILD_ADDED_EVENT]) {
eventType = FIRDataEventTypeChildAdded;
} else if ([name isEqualToString:DATABASE_CHILD_MODIFIED_EVENT]) {
eventType = FIRDataEventTypeChildChanged;
} else if ([name isEqualToString:DATABASE_CHILD_REMOVED_EVENT]) {
eventType = FIRDataEventTypeChildRemoved;
} else if ([name isEqualToString:DATABASE_CHILD_MOVED_EVENT]) {
eventType = FIRDataEventTypeChildMoved;
}
return eventType;
}
@end
@implementation RNFirebaseDatabase
RCT_EXPORT_MODULE();
- (id)init {
self = [super init];
if (self != nil) {
_dbReferences = [[NSMutableDictionary alloc] init];
_transactions = [[NSMutableDictionary alloc] init];
_transactionQueue = dispatch_queue_create("io.invertase.react-native-firebase", DISPATCH_QUEUE_CONCURRENT);
}
return self;
}
- (void)sendTransactionEvent:(NSString *)type body:(id)body {
@try {
[self sendEventWithName:type body:body];
} @catch (NSException *err) {
NSLog(@"An error occurred in sendJSEvent: %@", [err debugDescription]);
NSLog(@"Tried to send: %@ with %@", type, body);
}
}
RCT_EXPORT_METHOD(startTransaction:
(NSString *) path
identifier:
(NSString *) identifier
applyLocally:
(BOOL) applyLocally) {
dispatch_async(_transactionQueue, ^{
NSMutableDictionary *transactionState = [NSMutableDictionary new];
dispatch_semaphore_t sema = dispatch_semaphore_create(0);
transactionState[@"semaphore"] = sema;
FIRDatabaseReference *ref = [self getPathRef:path];
[ref runTransactionBlock:^FIRTransactionResult * _Nonnull(FIRMutableData *
_Nonnull currentData) {
dispatch_barrier_async(_transactionQueue, ^{
[_transactions setValue:transactionState forKey:identifier];
[self sendTransactionEvent:DATABASE_TRANSACTION_EVENT body:@{@"id": identifier, @"type": @"update", @"value": currentData.value}];
});
// wait for the js event handler to call tryCommitTransaction
// this wait occurs on the Firebase Worker Queue
// so if the tryCommitTransaction fails to signal the semaphore
// no further blocks will be executed by Firebase until the timeout expires
dispatch_time_t delayTime = dispatch_time(DISPATCH_TIME_NOW, 30 * NSEC_PER_SEC);
BOOL timedout = dispatch_semaphore_wait(sema, delayTime) != 0;
BOOL abort = [transactionState valueForKey:@"abort"] || timedout;
id value = [transactionState valueForKey:@"value"];
dispatch_barrier_async(_transactionQueue, ^{
[_transactions removeObjectForKey:identifier];
});
if (abort) {
return [FIRTransactionResult abort];
} else {
currentData.value = value;
return [FIRTransactionResult successWithValue:currentData];
}
}
andCompletionBlock:
^(NSError *_Nullable databaseError, BOOL committed, FIRDataSnapshot *_Nullable snapshot) {
if (databaseError != nil) {
[self sendTransactionEvent:DATABASE_TRANSACTION_EVENT body:@{@"id": identifier, @"type": @"error", @"code": @([databaseError code]), @"message": [databaseError description]}];
} else {
[self sendTransactionEvent:DATABASE_TRANSACTION_EVENT body:@{@"id": identifier, @"type": @"complete", @"committed": @(committed), @"snapshot": [RNFirebaseDBReference snapshotToDict:snapshot],}];
}
}
withLocalEvents:
applyLocally];
});
}
RCT_EXPORT_METHOD(tryCommitTransaction:
(NSString *) identifier
withData:
(NSDictionary *) data) {
__block NSMutableDictionary *transactionState;
dispatch_sync(_transactionQueue, ^{
transactionState = _transactions[identifier];
});
if (!transactionState) {
NSLog(@"tryCommitTransaction for unknown ID %@", identifier);
return;
}
dispatch_semaphore_t sema = [transactionState valueForKey:@"semaphore"];
BOOL abort = [[data valueForKey:@"abort"] boolValue];
if (abort) {
[transactionState setValue:@true forKey:@"abort"];
} else {
id newValue = [data valueForKey:@"value"];
[transactionState setValue:newValue forKey:@"value"];
}
dispatch_semaphore_signal(sema);
}
RCT_EXPORT_METHOD(enablePersistence:
(BOOL) enable
callback:
(RCTResponseSenderBlock) callback) {
BOOL isEnabled = [FIRDatabase database].persistenceEnabled;
if (isEnabled != enable) {
@try {
[FIRDatabase database].persistenceEnabled = enable;
} @catch (NSException *exception) {
// do nothing - for RN packager reloads
}
}
callback(@[[NSNull null], @{@"result": @"success"}]);
}
RCT_EXPORT_METHOD(keepSynced:
(NSString *) path
withEnable:
(BOOL) enable
callback:
(RCTResponseSenderBlock) callback) {
FIRDatabaseReference *ref = [self getPathRef:path];
[ref keepSynced:enable];
callback(@[[NSNull null], @{@"status": @"success", @"path": path}]);
}
RCT_EXPORT_METHOD(set:
(NSString *) path
data:
(NSDictionary *) data
callback:
(RCTResponseSenderBlock) callback) {
FIRDatabaseReference *ref = [self getPathRef:path];
[ref setValue:[data valueForKey:@"value"] withCompletionBlock:^(NSError *_Nullable error, FIRDatabaseReference *_Nonnull _ref) {
[self handleCallback:@"set" callback:callback databaseError:error];
}];
}
RCT_EXPORT_METHOD(update:
(NSString *) path
value:
(NSDictionary *) value
callback:
(RCTResponseSenderBlock) callback) {
FIRDatabaseReference *ref = [self getPathRef:path];
[ref updateChildValues:value withCompletionBlock:^(NSError *_Nullable error, FIRDatabaseReference *_Nonnull _ref) {
[self handleCallback:@"update" callback:callback databaseError:error];
}];
}
RCT_EXPORT_METHOD(remove:
(NSString *) path
callback:
(RCTResponseSenderBlock) callback) {
FIRDatabaseReference *ref = [self getPathRef:path];
[ref removeValueWithCompletionBlock:^(NSError *_Nullable error, FIRDatabaseReference *_Nonnull _ref) {
[self handleCallback:@"remove" callback:callback databaseError:error];
}];
}
RCT_EXPORT_METHOD(push:
(NSString *) path
data:
(NSDictionary *) data
callback:
(RCTResponseSenderBlock) callback) {
FIRDatabaseReference *ref = [self getPathRef:path];
FIRDatabaseReference *newRef = [ref childByAutoId];
NSURL *url = [NSURL URLWithString:newRef.URL];
NSString *newPath = [url path];
if ([data count] > 0) {
[newRef setValue:[data valueForKey:@"value"] withCompletionBlock:^(NSError *_Nullable error, FIRDatabaseReference *_Nonnull _ref) {
if (error != nil) {
// Error handling
NSDictionary *evt = @{@"code": @([error code]), @"details": [error debugDescription], @"message": [error localizedDescription], @"description": [error description]};
callback(@[evt]);
} else {
callback(@[[NSNull null], @{@"status": @"success", @"ref": newPath}]);
}
}];
} else {
callback(@[[NSNull null], @{@"status": @"success", @"ref": newPath}]);
}
}
RCT_EXPORT_METHOD(on:
(nonnull
NSNumber *) refId
path:(NSString *) path
modifiers:(NSArray *) modifiers
listenerId:(nonnull NSNumber *) listenerId
name:(NSString *) eventName
callback:(RCTResponseSenderBlock) callback) {
RNFirebaseDBReference *ref = [self getDBHandle:refId path:path modifiers:modifiers];
[ref addEventHandler:listenerId eventName:eventName];
callback(@[[NSNull null], @{@"status": @"success", @"refId": refId, @"handle": path}]);
}
RCT_EXPORT_METHOD(once:
(nonnull
NSNumber *) refId
path:(NSString *) path
modifiers:(NSArray *) modifiers
eventName:(NSString *) eventName
callback:(RCTResponseSenderBlock) callback) {
RNFirebaseDBReference *ref = [self getDBHandle:refId path:path modifiers:modifiers];
[ref addSingleEventHandler:callback];
}
RCT_EXPORT_METHOD(off:
(nonnull
NSNumber *) refId
listeners:(NSArray *) listeners
callback:(RCTResponseSenderBlock) callback) {
RNFirebaseDBReference *ref = _dbReferences[refId];
if (ref != nil) {
for (NSDictionary *listener in listeners) {
NSNumber *listenerId = [listener valueForKey:@"listenerId"];
NSString *eventName = [listener valueForKey:@"eventName"];
[ref removeEventHandler:listenerId eventName:eventName];
if (![ref hasListeners]) {
[_dbReferences removeObjectForKey:refId];
}
}
}
callback(@[[NSNull null], @{@"status": @"success", @"refId": refId,}]);
}
// On disconnect
RCT_EXPORT_METHOD(onDisconnectSet:
(NSString *) path
props:
(NSDictionary *) props
callback:
(RCTResponseSenderBlock) callback) {
FIRDatabaseReference *ref = [self getPathRef:path];
[ref onDisconnectSetValue:props[@"value"] withCompletionBlock:^(NSError *_Nullable error, FIRDatabaseReference *_Nonnull _ref) {
[self handleCallback:@"onDisconnectSetObject" callback:callback databaseError:error];
}];
}
RCT_EXPORT_METHOD(onDisconnectRemove:
(NSString *) path
callback:
(RCTResponseSenderBlock) callback) {
FIRDatabaseReference *ref = [self getPathRef:path];
[ref onDisconnectRemoveValueWithCompletionBlock:^(NSError *_Nullable error, FIRDatabaseReference *_Nonnull _ref) {
[self handleCallback:@"onDisconnectRemove" callback:callback databaseError:error];
}];
}
RCT_EXPORT_METHOD(onDisconnectCancel:
(NSString *) path
callback:
(RCTResponseSenderBlock) callback) {
FIRDatabaseReference *ref = [self getPathRef:path];
[ref cancelDisconnectOperationsWithCompletionBlock:^(NSError *_Nullable error, FIRDatabaseReference *_Nonnull _ref) {
[self handleCallback:@"onDisconnectCancel" callback:callback databaseError:error];
}];
}
RCT_EXPORT_METHOD(goOffline) {
[FIRDatabase database].goOffline;
}
RCT_EXPORT_METHOD(goOnline) {
[FIRDatabase database].goOnline;
}
- (FIRDatabaseReference *)getPathRef:(NSString *)path {
return [[[FIRDatabase database] reference] child:path];
}
- (void)handleCallback:(NSString *)methodName callback:(RCTResponseSenderBlock)callback databaseError:(NSError *)databaseError {
if (databaseError != nil) {
NSDictionary *evt = @{@"code": @([databaseError code]), @"details": [databaseError debugDescription], @"message": [databaseError localizedDescription], @"description": [databaseError description]};
callback(@[evt]);
} else {
callback(@[[NSNull null], @{@"status": @"success", @"method": methodName}]);
}
}
- (RNFirebaseDBReference *)getDBHandle:(NSNumber *)refId path:(NSString *)path modifiers:(NSArray *)modifiers {
RNFirebaseDBReference *ref = _dbReferences[refId];
if (ref == nil) {
ref = [[RNFirebaseDBReference alloc] initWithPathAndModifiers:self database:[FIRDatabase database] refId:refId path:path modifiers:modifiers];
_dbReferences[refId] = ref;
}
return ref;
}
// Not sure how to get away from this... yet
- (NSArray<NSString *> *)supportedEvents {
return @[DATABASE_DATA_EVENT, DATABASE_ERROR_EVENT, DATABASE_TRANSACTION_EVENT];
}
@end
#else
@implementation RNFirebaseDatabase
@end
#endif