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//
// FirestackDatabase.m
// Firestack
//
// Created by Ari Lerner on 8/23/16.
// Copyright © 2016 Facebook. All rights reserved.
//
#import "Firestack.h"
#import "FirestackDatabase.h"
#import "FirestackEvents.h"
@interface FirestackDBReference : NSObject
@property RCTEventEmitter *emitter;
@property FIRDatabaseQuery *query;
@property NSString *path;
@property NSString *modifiersString;
@property NSMutableDictionary *listeners;
@property FIRDatabaseHandle childAddedHandler;
@property FIRDatabaseHandle childModifiedHandler;
@property FIRDatabaseHandle childRemovedHandler;
@property FIRDatabaseHandle childMovedHandler;
@property FIRDatabaseHandle childValueHandler;
+ (NSDictionary *) snapshotToDict:(FIRDataSnapshot *) snapshot;
@end
@implementation FirestackDBReference
- (id) initWithPathAndModifiers:(RCTEventEmitter *) emitter
database:(FIRDatabase *) database
path:(NSString *) path
modifiers:(NSArray *) modifiers
modifiersString:(NSString *) modifiersString
{
self = [super init];
if (self) {
_emitter = emitter;
_path = path;
_modifiersString = modifiersString;
_query = [self buildQueryAtPathWithModifiers:database path:path modifiers:modifiers];
_listeners = [[NSMutableDictionary alloc] init];
}
return self;
}
- (NSString *) absPath:(FIRDatabaseReference *) ref {
NSString *url = ref.URL;
NSString *rooturl = ref.root.URL;
return [[url substringFromIndex:rooturl.length] stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
}
- (void) addEventHandler:(NSString *) eventName
{
if (![self isListeningTo:eventName]) {
id withBlock = ^(FIRDataSnapshot * _Nonnull snapshot) {
NSDictionary *props = [FirestackDBReference snapshotToDict:snapshot];
[self sendJSEvent:DATABASE_DATA_EVENT
title:eventName
props: @{
@"eventName": eventName,
@"path": [self absPath:[snapshot ref]],
@"modifiersString": _modifiersString,
@"snapshot": props,
@"handlePath": _path
}];
};
id errorBlock = ^(NSError * _Nonnull error) {
NSLog(@"Error onDBEvent: %@", [error debugDescription]);
[self getAndSendDatabaseError:error
path:_path
modifiersString:_modifiersString];
};
int eventType = [self eventTypeFromName:eventName];
FIRDatabaseHandle handle = [_query observeEventType:eventType
withBlock:withBlock
withCancelBlock:errorBlock];
[self setEventHandler:handle forName:eventName];
} else {
NSLog(@"Warning Trying to add duplicate listener for type: %@ with modifiers: %@ for path: %@", eventName, _modifiersString, _path);
}
}
- (void) addSingleEventHandler:(RCTResponseSenderBlock) callback
ofType:(NSString *) type
{
int eventType = [self eventTypeFromName:type];
[_query observeSingleEventOfType:eventType
withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {
NSDictionary *props = [FirestackDBReference snapshotToDict:snapshot];
callback(@[[NSNull null], @{
@"eventName": type,
@"path": [self absPath:[snapshot ref]],
@"modifiersString": _modifiersString,
@"snapshot": props
}]);
}
withCancelBlock:^(NSError * _Nonnull error) {
NSLog(@"Error onDBEventOnce: %@", [error debugDescription]);
callback(@[@{
@"error": @"onceError",
@"msg": [error debugDescription]
}]);
}];
}
- (void) removeEventHandler:(NSString *) name
{
int eventType = [self eventTypeFromName:name];
switch (eventType) {
case FIRDataEventTypeValue:
if (self.childValueHandler != nil) {
[_query removeObserverWithHandle:self.childValueHandler];
self.childValueHandler = nil;
}
break;
case FIRDataEventTypeChildAdded:
if (self.childAddedHandler != nil) {
[_query removeObserverWithHandle:self.childAddedHandler];
self.childAddedHandler = nil;
}
break;
case FIRDataEventTypeChildChanged:
if (self.childModifiedHandler != nil) {
[_query removeObserverWithHandle:self.childModifiedHandler];
self.childModifiedHandler = nil;
}
break;
case FIRDataEventTypeChildRemoved:
if (self.childRemovedHandler != nil) {
[_query removeObserverWithHandle:self.childRemovedHandler];
self.childRemovedHandler = nil;
}
break;
case FIRDataEventTypeChildMoved:
if (self.childMovedHandler != nil) {
[_query removeObserverWithHandle:self.childMovedHandler];
self.childMovedHandler = nil;
}
break;
default:
break;
}
[self unsetListeningOn:name];
}
+ (NSDictionary *) snapshotToDict:(FIRDataSnapshot *) snapshot
{
NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
[dict setValue:snapshot.key forKey:@"key"];
NSDictionary *val = snapshot.value;
[dict setObject:val forKey:@"value"];
NSDictionary *exportValue = snapshot.valueInExportFormat;
[dict setObject:exportValue forKey:@"exportValue"];
// 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
path:(NSString *) path
modifiersString:(NSString *) modifiersString
{
NSDictionary *evt = @{
@"eventName": DATABASE_ERROR_EVENT,
@"path": path,
@"modifiersString": modifiersString,
@"msg": [error debugDescription]
};
[self sendJSEvent:DATABASE_ERROR_EVENT title:DATABASE_ERROR_EVENT props: evt];
return evt;
}
- (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 (NSString *str in modifiers) {
if ([str isEqualToString:@"orderByKey"]) {
query = [query queryOrderedByKey];
} else if ([str isEqualToString:@"orderByPriority"]) {
query = [query queryOrderedByPriority];
} else if ([str isEqualToString:@"orderByValue"]) {
query = [query queryOrderedByValue];
} else if ([str containsString:@"orderByChild"]) {
NSArray *args = [str componentsSeparatedByString:@":"];
NSString *key = args[1];
query = [query queryOrderedByChild:key];
} else if ([str containsString:@"limitToLast"]) {
NSArray *args = [str componentsSeparatedByString:@":"];
NSString *key = args[1];
NSUInteger limit = key.integerValue;
query = [query queryLimitedToLast:limit];
} else if ([str containsString:@"limitToFirst"]) {
NSArray *args = [str componentsSeparatedByString:@":"];
NSString *key = args[1];
NSUInteger limit = key.integerValue;
query = [query queryLimitedToFirst:limit];
} else if ([str containsString:@"equalTo"]) {
NSArray *args = [str componentsSeparatedByString:@":"];
int size = (int)[args count];;
id value = [self getIdValue:args[1] type:args[2]];
if (size > 3) {
NSString *key = args[3];
query = [query queryEqualToValue:value
childKey:key];
} else {
query = [query queryEqualToValue:value];
}
} else if ([str containsString:@"endAt"]) {
NSArray *args = [str componentsSeparatedByString:@":"];
int size = (int)[args count];;
id value = [self getIdValue:args[1] type:args[2]];
if (size > 3) {
NSString *key = args[3];
query = [query queryEndingAtValue:value
childKey:key];
} else {
query = [query queryEndingAtValue:value];
}
} else if ([str containsString:@"startAt"]) {
NSArray *args = [str componentsSeparatedByString:@":"];
id value = [self getIdValue:args[1] type:args[2]];
int size = (int)[args count];;
if (size > 3) {
NSString *key = args[3];
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 [NSNumber numberWithInteger:value.integerValue];
} else if ([type isEqualToString:@"boolean"]) {
return [NSNumber numberWithBool:value.boolValue];
} else {
return value;
}
}
- (void) setEventHandler:(FIRDatabaseHandle) handle
forName:(NSString *) name
{
int eventType = [self eventTypeFromName:name];
switch (eventType) {
case FIRDataEventTypeValue:
self.childValueHandler = handle;
break;
case FIRDataEventTypeChildAdded:
self.childAddedHandler = handle;
break;
case FIRDataEventTypeChildChanged:
self.childModifiedHandler = handle;
break;
case FIRDataEventTypeChildRemoved:
self.childRemovedHandler = handle;
break;
case FIRDataEventTypeChildMoved:
self.childMovedHandler = handle;
break;
default:
break;
}
[self setListeningOn:name withHandle:handle];
}
- (void) setListeningOn:(NSString *) name
withHandle:(FIRDatabaseHandle) handle
{
[_listeners setValue:@(handle) forKey:name];
}
- (void) unsetListeningOn:(NSString *) name
{
[_listeners removeObjectForKey:name];
}
- (BOOL) isListeningTo:(NSString *) name
{
return [_listeners valueForKey:name] != nil;
}
- (BOOL) hasListeners
{
return [[_listeners allKeys] count] > 0;
}
- (NSArray *) listenerKeys
{
return [_listeners allKeys];
}
- (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;
}
- (void) cleanup {
if (self.childValueHandler > 0) {
[self removeEventHandler:DATABASE_VALUE_EVENT];
}
if (self.childAddedHandler > 0) {
[self removeEventHandler:DATABASE_CHILD_ADDED_EVENT];
}
if (self.childModifiedHandler > 0) {
[self removeEventHandler:DATABASE_CHILD_MODIFIED_EVENT];
}
if (self.childRemovedHandler > 0) {
[self removeEventHandler:DATABASE_CHILD_REMOVED_EVENT];
}
if (self.childMovedHandler > 0) {
[self removeEventHandler:DATABASE_CHILD_MOVED_EVENT];
}
}
@end
@implementation FirestackDatabase
RCT_EXPORT_MODULE(FirestackDatabase);
- (id) init
{
self = [super init];
if (self != nil) {
_dbReferences = [[NSMutableDictionary alloc] init];
_transactions = [[NSMutableDictionary alloc] init];
_transactionQueue = dispatch_queue_create("com.fullstackreact.react-native-firestack", DISPATCH_QUEUE_CONCURRENT);
}
return self;
}
RCT_EXPORT_METHOD(enablePersistence:(BOOL) enable
callback:(RCTResponseSenderBlock) callback)
{
[FIRDatabase database].persistenceEnabled = enable;
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(setWithPriority:(NSString *) path
data:(NSDictionary *)data
priority: (NSDictionary *)priority
callback:(RCTResponseSenderBlock) callback)
{
FIRDatabaseReference *ref = [self getPathRef:path];
[ref setValue:[data valueForKey:@"value"] andPriority:[priority valueForKey:@"value"] withCompletionBlock:^(NSError * _Nullable error, FIRDatabaseReference * _Nonnull ref) {
[self handleCallback:@"setWithPriority" 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 = @{
@"errorCode": [NSNumber numberWithInt:[error code]],
@"errorDetails": [error debugDescription],
@"description": [error description]
};
callback(@[evt]);
} else {
callback(@[[NSNull null], @{
@"status": @"success",
@"ref": newPath
}]);
}
}];
} else {
callback(@[[NSNull null], @{
@"status": @"success",
@"ref": newPath
}]);
}
}
RCT_EXPORT_METHOD(beginTransaction:(NSString *) path
withIdentifier:(NSString *) identifier
applyLocally:(BOOL) applyLocally
onComplete:(RCTResponseSenderBlock) onComplete)
{
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];
[ref runTransactionBlock:^FIRTransactionResult * _Nonnull(FIRMutableData * _Nonnull currentData) {
dispatch_barrier_async(_transactionQueue, ^{
[_transactions setValue:transactionState forKey:identifier];
[self sendEventWithName:DATABASE_TRANSACTION_EVENT
body:@{
@"id": identifier,
@"originalValue": currentData.value
}];
});
// Wait for the event handler to call tryCommitTransaction
// WARNING: This wait occurs on the Firebase Worker Queue
// so if 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) {
NSDictionary *evt = @{
@"errorCode": [NSNumber numberWithInt:[databaseError code]],
@"errorDetails": [databaseError debugDescription],
@"description": [databaseError description]
};
onComplete(@[evt]);
} else {
onComplete(@[[NSNull null], @{
@"committed": [NSNumber numberWithBool:committed],
@"snapshot": [FirestackDBReference snapshotToDict:snapshot],
@"status": @"success",
@"method": @"transaction"
}]);
}
} withLocalEvents:applyLocally];
});
}
RCT_EXPORT_METHOD(tryCommitTransaction:(NSString *) identifier
withData:(NSDictionary *) data
orAbort:(BOOL) abort)
{
__block NSMutableDictionary *transactionState;
dispatch_sync(_transactionQueue, ^{
transactionState = [_transactions objectForKey: identifier];
});
if (!transactionState) {
NSLog(@"tryCommitTransaction for unknown ID %@", identifier);
return;
}
dispatch_semaphore_t sema = [transactionState valueForKey:@"semaphore"];
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(on:(NSString *) path
modifiersString:(NSString *) modifiersString
modifiers:(NSArray *) modifiers
name:(NSString *) eventName
callback:(RCTResponseSenderBlock) callback)
{
FirestackDBReference *ref = [self getDBHandle:path modifiers:modifiers modifiersString:modifiersString];
[ref addEventHandler:eventName];
callback(@[[NSNull null], @{
@"status": @"success",
@"handle": path
}]);
}
RCT_EXPORT_METHOD(onOnce:(NSString *) path
modifiersString:(NSString *) modifiersString
modifiers:(NSArray *) modifiers
name:(NSString *) name
callback:(RCTResponseSenderBlock) callback)
{
FirestackDBReference *ref = [self getDBHandle:path modifiers:modifiers modifiersString:modifiersString];
[ref addSingleEventHandler:callback ofType:name];
}
RCT_EXPORT_METHOD(off:(NSString *)path
modifiersString:(NSString *) modifiersString
eventName:(NSString *) eventName
callback:(RCTResponseSenderBlock) callback)
{
NSString *key = [self getDBListenerKey:path withModifiers:modifiersString];
NSArray *listenerKeys;
FirestackDBReference *ref = [_dbReferences objectForKey:key];
if (ref == nil) {
listenerKeys = @[];
} else {
if (eventName == nil || [eventName isEqualToString:@""]) {
[ref cleanup];
[_dbReferences removeObjectForKey:key];
} else {
[ref removeEventHandler:eventName];
if (![ref hasListeners]) {
[_dbReferences removeObjectForKey:key];
}
}
listenerKeys = [ref listenerKeys];
}
callback(@[[NSNull null], @{
@"result": @"success",
@"handle": path,
@"modifiersString": modifiersString,
@"remainingListeners": listenerKeys,
}]);
}
// On disconnect
RCT_EXPORT_METHOD(onDisconnectSetObject:(NSString *) path
props:(NSDictionary *) props
callback:(RCTResponseSenderBlock) callback)
{
FIRDatabaseReference *ref = [self getPathRef:path];
[ref onDisconnectSetValue:props
withCompletionBlock:^(NSError * _Nullable error, FIRDatabaseReference * _Nonnull ref) {
[self handleCallback:@"onDisconnectSetObject" callback:callback databaseError:error];
}];
}
RCT_EXPORT_METHOD(onDisconnectSetString:(NSString *) path
val:(NSString *) val
callback:(RCTResponseSenderBlock) callback)
{
FIRDatabaseReference *ref = [self getPathRef:path];
[ref onDisconnectSetValue:val
withCompletionBlock:^(NSError * _Nullable error, FIRDatabaseReference * _Nonnull ref) {
[self handleCallback:@"onDisconnectSetString" 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 = @{
@"errorCode": [NSNumber numberWithInt:[databaseError code]],
@"errorDetails": [databaseError debugDescription],
@"description": [databaseError description]
};
callback(@[evt]);
} else {
callback(@[[NSNull null], @{
@"status": @"success",
@"method": methodName
}]);
}
}
- (FirestackDBReference *) getDBHandle:(NSString *) path
modifiers:modifiers
modifiersString:modifiersString
{
NSString *key = [self getDBListenerKey:path withModifiers:modifiersString];
FirestackDBReference *ref = [_dbReferences objectForKey:key];
if (ref == nil) {
ref = [[FirestackDBReference alloc] initWithPathAndModifiers:self
database:[FIRDatabase database]
path:path
modifiers:modifiers
modifiersString:modifiersString];
[_dbReferences setObject:ref forKey:key];
}
return ref;
}
- (NSString *) getDBListenerKey:(NSString *) path
withModifiers:(NSString *) modifiersString
{
return [NSString stringWithFormat:@"%@ | %@", path, modifiersString, nil];
}
// Not sure how to get away from this... yet
- (NSArray<NSString *> *)supportedEvents {
return @[DATABASE_DATA_EVENT, DATABASE_ERROR_EVENT, DATABASE_TRANSACTION_EVENT];
}
@end