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

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#import "RNFirebase.h"
#import "RNFirebaseDatabase.h"
#import "RNFirebaseEvents.h"
@interface RNFirebaseDBReference : NSObject
@property RCTEventEmitter *emitter;
@property FIRDatabaseQuery *query;
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@property NSNumber *refId;
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@property NSString *path;
@property NSMutableDictionary *listeners;
+ (NSDictionary *) snapshotToDict:(FIRDataSnapshot *) snapshot;
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@end
@implementation RNFirebaseDBReference
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- (id) initWithPathAndModifiers:(RCTEventEmitter *) emitter
database:(FIRDatabase *) database
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refId:(NSNumber *) refId
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path:(NSString *) path
modifiers:(NSArray *) modifiers
{
self = [super init];
if (self) {
_emitter = emitter;
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_refId = refId;
_path = path;
_query = [self buildQueryAtPathWithModifiers:database path:path modifiers:modifiers];
_listeners = [[NSMutableDictionary alloc] init];
}
return self;
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}
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- (void) addEventHandler:(NSNumber *) listenerId
eventName:(NSString *) eventName
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{
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if (![_listeners objectForKey:listenerId]) {
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id withBlock = ^(FIRDataSnapshot * _Nonnull snapshot) {
NSDictionary *props = [RNFirebaseDBReference snapshotToDict:snapshot];
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[self sendJSEvent:DATABASE_DATA_EVENT
title:eventName
props: @{
@"eventName": eventName,
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@"refId": _refId,
@"listenerId": listenerId,
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@"path": _path,
@"snapshot": props
}];
};
id errorBlock = ^(NSError * _Nonnull error) {
NSLog(@"Error onDBEvent: %@", [error debugDescription]);
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[self removeEventHandler:listenerId eventName:eventName];
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[self getAndSendDatabaseError:error
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listenerId:listenerId];
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};
int eventType = [self eventTypeFromName:eventName];
FIRDatabaseHandle handle = [_query observeEventType:eventType
withBlock:withBlock
withCancelBlock:errorBlock];
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[_listeners setObject:@(handle) forKey:listenerId];
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} else {
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NSLog(@"Warning Trying to add duplicate listener for refId: %@ listenerId: %@", _refId, listenerId);
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}
}
- (void) addSingleEventHandler:(RCTResponseSenderBlock) callback
{
[_query observeSingleEventOfType:FIRDataEventTypeValue
withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {
NSDictionary *props = [RNFirebaseDBReference snapshotToDict:snapshot];
callback(@[[NSNull null], @{
@"eventName": @"value",
@"path": _path,
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@"refId": _refId,
@"snapshot": props
}]);
}
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withCancelBlock:^(NSError * _Nonnull error) {
NSLog(@"Error onDBEventOnce: %@", [error debugDescription]);
callback(@[@{
@"eventName": DATABASE_ERROR_EVENT,
@"path": _path,
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@"refId": _refId,
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@"code": @([error code]),
@"details": [error debugDescription],
@"message": [error localizedDescription],
@"description": [error description]
}]);
}];
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}
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- (void) removeEventHandler:(NSNumber *) listenerId
eventName:(NSString *) eventName
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{
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FIRDatabaseHandle handle = [[_listeners objectForKey:listenerId] integerValue];
if (handle) {
[_listeners removeObjectForKey:listenerId];
[_query removeObserverWithHandle:handle];
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}
}
+ (NSDictionary *) snapshotToDict:(FIRDataSnapshot *) snapshot
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{
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
[dict setValue:snapshot.key forKey:@"key"];
NSDictionary *val = snapshot.value;
[dict setObject:val forKey:@"value"];
// 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 setObject:childKeys forKey:@"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
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listenerId:(NSNumber *) listenerId
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{
NSDictionary *event = @{
@"eventName": DATABASE_ERROR_EVENT,
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@"path": _path,
@"refId": _refId,
@"listenerId": listenerId,
@"code": @([error code]),
@"details": [error debugDescription],
@"message": [error localizedDescription],
@"description": [error description]
};
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@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);
}
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return event;
}
- (void) sendJSEvent:(NSString *)type title:(NSString *)title props:(NSDictionary *)props {
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@try {
[_emitter sendEventWithName:type body:@{ @"eventName": title, @"body": props }];
} @catch (NSException *err) {
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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];
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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];
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}
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} 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];
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}
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} 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];
}
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}
}
}
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return query;
}
- (id) getIdValue:(NSString *) value
type:(NSString *) type
{
if ([type isEqualToString:@"number"]) {
return [NSNumber numberWithInteger:value.integerValue];
} else if ([type isEqualToString:@"boolean"]) {
return [NSNumber numberWithBool:value.boolValue];
} else {
return value;
}
}
- (BOOL) hasListeners
{
return [[_listeners allKeys] count] > 0;
}
- (int) eventTypeFromName:(NSString *)name
{
int eventType = FIRDataEventTypeValue;
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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
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@implementation RNFirebaseDatabase
RCT_EXPORT_MODULE(RNFirebaseDatabase);
- (id) init {
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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);
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}
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 setObject:sema forKey:@"semaphore"];
FIRDatabaseReference *ref = [self getPathRef:path];
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[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 }];
});
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// 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;
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BOOL abort = [transactionState valueForKey:@"abort"] || timedout;
id value = [transactionState valueForKey:@"value"];
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dispatch_barrier_async(_transactionQueue, ^{
[_transactions removeObjectForKey:identifier];
});
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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": [NSNumber numberWithInt:[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;
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dispatch_sync(_transactionQueue, ^{
transactionState = [_transactions objectForKey: identifier];
});
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if (!transactionState) {
NSLog(@"tryCommitTransaction for unknown ID %@", identifier);
return;
}
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dispatch_semaphore_t sema = [transactionState valueForKey:@"semaphore"];
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BOOL abort = [[data valueForKey:@"abort"] boolValue];
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if (abort) {
[transactionState setValue:@true forKey:@"abort"];
} else {
id newValue = [data valueForKey:@"value"];
[transactionState setValue:newValue forKey:@"value"];
}
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dispatch_semaphore_signal(sema);
}
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RCT_EXPORT_METHOD(enablePersistence:(BOOL) enable
callback:(RCTResponseSenderBlock) callback)
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{
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BOOL isEnabled = [FIRDatabase database].persistenceEnabled;
if ( isEnabled != enable) {
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@try {
[FIRDatabase database].persistenceEnabled = enable;
} @catch (NSException *exception) {
// do nothing - for RN packager reloads
}
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}
callback(@[[NSNull null], @{
@"result": @"success"
}]);
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}
RCT_EXPORT_METHOD(keepSynced:(NSString *) path
withEnable:(BOOL) enable
callback:(RCTResponseSenderBlock) callback)
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{
FIRDatabaseReference *ref = [self getPathRef:path];
[ref keepSynced:enable];
callback(@[[NSNull null], @{
@"status": @"success",
@"path": path
}]);
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}
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];
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NSURL *url = [NSURL URLWithString:newRef.URL];
NSString *newPath = [url path];
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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]
};
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callback(@[evt]);
} else {
callback(@[[NSNull null], @{
@"status": @"success",
@"ref": newPath
}]);
}
}];
} else {
callback(@[[NSNull null], @{
@"status": @"success",
@"ref": newPath
}]);
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}
}
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RCT_EXPORT_METHOD(on:(nonnull NSNumber *) refId
path:(NSString *) path
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modifiers:(NSArray *) modifiers
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listenerId:(nonnull NSNumber *) listenerId
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name:(NSString *) eventName
callback:(RCTResponseSenderBlock) callback)
{
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RNFirebaseDBReference *ref = [self getDBHandle:refId path:path modifiers:modifiers];
[ref addEventHandler:listenerId eventName:eventName];
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callback(@[[NSNull null], @{
@"status": @"success",
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@"refId": refId,
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@"handle": path
}]);
}
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RCT_EXPORT_METHOD(once:(nonnull NSNumber *) refId
path:(NSString *) path
modifiers:(NSArray *) modifiers
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eventName:(NSString *) eventName
callback:(RCTResponseSenderBlock) callback)
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{
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RNFirebaseDBReference *ref = [self getDBHandle:refId path:path modifiers:modifiers];
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[ref addSingleEventHandler:callback];
}
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RCT_EXPORT_METHOD(off:(nonnull NSNumber *) refId
listeners:(NSArray *) listeners
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callback:(RCTResponseSenderBlock) callback)
{
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RNFirebaseDBReference *ref = [_dbReferences objectForKey:refId];
if (ref != nil) {
for (NSDictionary *listener in listeners) {
NSNumber *listenerId = [listener valueForKey:@"listenerId"];
NSString *eventName = [listener valueForKey:@"eventName"];
[ref removeEventHandler:listenerId eventName:eventName];
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if (![ref hasListeners]) {
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[_dbReferences removeObjectForKey:refId];
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}
}
}
callback(@[[NSNull null], @{
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@"status": @"success",
@"refId": refId,
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}]);
}
// On disconnect
RCT_EXPORT_METHOD(onDisconnectSet:(NSString *) path
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props:(NSDictionary *) props
callback:(RCTResponseSenderBlock) callback)
{
FIRDatabaseReference *ref = [self getPathRef:path];
[ref onDisconnectSetValue:props[@"value"]
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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": [NSNumber numberWithInt:[databaseError code]],
@"details": [databaseError debugDescription],
@"message": [databaseError localizedDescription],
@"description": [databaseError description]
};
callback(@[evt]);
} else {
callback(@[[NSNull null], @{
@"status": @"success",
@"method": methodName
}]);
}
}
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- (RNFirebaseDBReference *) getDBHandle:(NSNumber *) refId
path:(NSString *) path
modifiers:(NSArray *) modifiers
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{
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RNFirebaseDBReference *ref = [_dbReferences objectForKey:refId];
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if (ref == nil) {
ref = [[RNFirebaseDBReference alloc] initWithPathAndModifiers:self
database:[FIRDatabase database]
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refId:refId
path:path
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modifiers:modifiers];
[_dbReferences setObject:ref forKey:refId];
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}
return ref;
}
// Not sure how to get away from this... yet
- (NSArray<NSString *> *)supportedEvents {
return @[DATABASE_DATA_EVENT, DATABASE_ERROR_EVENT, DATABASE_TRANSACTION_EVENT];
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}
@end