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1 files changed, 211 insertions, 0 deletions

diff --git a/Firebase/Database/Realtime/FConnection.m b/Firebase/Database/Realtime/FConnection.m
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+++ b/Firebase/Database/Realtime/FConnection.m
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+/*
+ * Copyright 2017 Google
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#import "FConnection.h"
+#import "FConstants.h"
+
+typedef enum {
+    REALTIME_STATE_CONNECTING = 0,
+    REALTIME_STATE_CONNECTED = 1,
+    REALTIME_STATE_DISCONNECTED = 2,
+} FConnectionState;
+
+@interface FConnection () {
+    FConnectionState state;
+}
+
+@property (nonatomic, strong) FWebSocketConnection* conn;
+@property (nonatomic, strong) FRepoInfo* repoInfo;
+
+@end
+
+#pragma mark -
+#pragma mark FConnection implementation
+
+@implementation FConnection
+
+@synthesize delegate;
+@synthesize conn;
+@synthesize repoInfo;
+
+#pragma mark -
+#pragma mark Initializers
+
+- (id)initWith:(FRepoInfo *)aRepoInfo andDispatchQueue:(dispatch_queue_t)queue lastSessionID:(NSString *)lastSessionID{
+    self = [super init];
+    if (self) {
+        state = REALTIME_STATE_CONNECTING;
+        self.repoInfo = aRepoInfo;
+        self.conn = [[FWebSocketConnection alloc] initWith:self.repoInfo andQueue:queue lastSessionID:lastSessionID];
+        self.conn.delegate = self;
+    }
+    return self;
+}
+
+#pragma mark -
+#pragma mark Public method implementation
+
+- (void)open {
+    FFLog(@"I-RDB082001", @"Calling open in FConnection");
+    [self.conn open];
+}
+
+- (void) closeWithReason:(FDisconnectReason)reason {
+    if (state != REALTIME_STATE_DISCONNECTED) {
+        FFLog(@"I-RDB082002", @"Closing realtime connection.");
+        state = REALTIME_STATE_DISCONNECTED;
+            
+        if (self.conn) {
+            FFLog(@"I-RDB082003", @"Calling close again.");
+            [self.conn close];
+            self.conn = nil;
+        }
+            
+        [self.delegate onDisconnect:self withReason:reason];
+    }
+}
+
+- (void) close {
+    [self closeWithReason:DISCONNECT_REASON_OTHER];
+}
+
+- (void) sendRequest:(NSDictionary *)dataMsg sensitive:(BOOL)sensitive {
+    // since this came from the persistent connection, wrap it in a data message envelope
+    NSDictionary* msg = @{
+        kFWPRequestType: kFWPRequestTypeData,
+        kFWPRequestDataPayload: dataMsg
+    };
+    [self sendData:msg sensitive:sensitive];
+}
+
+#pragma mark -
+#pragma mark Helpers
+
+
+- (void) sendData:(NSDictionary *)data sensitive:(BOOL)sensitive {
+    if (state != REALTIME_STATE_CONNECTED) {
+        @throw [[NSException alloc] initWithName:@"InvalidConnectionState" reason:@"Tried to send data on an unconnected FConnection" userInfo:nil];
+    } else {
+        if (sensitive) {
+            FFLog(@"I-RDB082004", @"Sending data (contents hidden)");
+        } else {
+            FFLog(@"I-RDB082005", @"Sending: %@", data);
+        }
+        [self.conn send:data];
+    }
+}
+
+#pragma mark -
+#pragma mark FWebSocketConnectinDelegate implementation
+
+// Corresponds to onConnectionLost in JS
+- (void)onDisconnect:(FWebSocketConnection *)fwebSocket wasEverConnected:(BOOL)everConnected {
+
+    self.conn = nil;
+    if (!everConnected && state == REALTIME_STATE_CONNECTING) {
+        FFLog(@"I-RDB082006", @"Realtime connection failed.");
+
+        // Since we failed to connect at all, clear any cached entry for this namespace in case the machine went away
+        [self.repoInfo clearInternalHostCache];
+    } else if (state == REALTIME_STATE_CONNECTED) {
+        FFLog(@"I-RDB082007", @"Realtime connection lost.");
+    }
+    
+    [self close];
+}
+
+// Corresponds to onMessageReceived in JS
+- (void)onMessage:(FWebSocketConnection *)fwebSocket withMessage:(NSDictionary *)message {
+    NSString* rawMessageType = [message objectForKey:kFWPAsyncServerEnvelopeType];
+    if(rawMessageType != nil) {
+        if([rawMessageType isEqualToString:kFWPAsyncServerDataMessage]) {
+            [self onDataMessage:[message objectForKey:kFWPAsyncServerEnvelopeData]];
+        }
+        else if ([rawMessageType isEqualToString:kFWPAsyncServerControlMessage]) {
+            [self onControl:[message objectForKey:kFWPAsyncServerEnvelopeData]];
+        }
+        else {
+            FFLog(@"I-RDB082008", @"Unrecognized server packet type: %@", rawMessageType);    
+        }
+    }
+    else {
+        FFLog(@"I-RDB082009", @"Unrecognized raw server packet received: %@", message);
+    }
+}
+
+- (void) onDataMessage:(NSDictionary *)message {
+    // we don't do anything with data messages, just kick them up a level
+    FFLog(@"I-RDB082010", @"Got data message: %@", message);
+    [self.delegate onDataMessage:self withMessage:message];
+}
+
+- (void) onControl:(NSDictionary *)message {
+    FFLog(@"I-RDB082011", @"Got control message: %@", message);
+    NSString* type = [message objectForKey:kFWPAsyncServerControlMessageType];
+    if([type isEqualToString:kFWPAsyncServerControlMessageShutdown]) {
+        NSString* reason = [message objectForKey:kFWPAsyncServerControlMessageData];
+        [self onConnectionShutdownWithReason:reason];
+    }
+    else if ([type isEqualToString:kFWPAsyncServerControlMessageReset]) {
+        NSString* host = [message objectForKey:kFWPAsyncServerControlMessageData];
+        [self onReset:host];
+    }
+    else if ([type isEqualToString:kFWPAsyncServerHello]) {
+        NSDictionary* handshakeData = [message objectForKey:kFWPAsyncServerControlMessageData];
+        [self onHandshake:handshakeData];
+    }
+    else {
+        FFLog(@"I-RDB082012", @"Unknown control message returned from server: %@", message);
+    }
+}
+
+- (void) onConnectionShutdownWithReason:(NSString *)reason {
+    FFLog(@"I-RDB082013", @"Connection shutdown command received. Shutting down...");
+    
+    [self.delegate onKill:self withReason:reason];
+    [self close];
+}
+
+- (void) onHandshake:(NSDictionary *)handshake {
+    NSNumber* timestamp = [handshake objectForKey:kFWPAsyncServerHelloTimestamp];
+//    NSString* version = [handshake objectForKey:kFWPAsyncServerHelloVersion];
+    NSString* host = [handshake objectForKey:kFWPAsyncServerHelloConnectedHost];
+    NSString* sessionID = [handshake objectForKey:kFWPAsyncServerHelloSession];
+    
+    self.repoInfo.internalHost = host;
+        
+    if (state == REALTIME_STATE_CONNECTING) {
+        [self.conn start];
+        [self onConnection:self.conn readyAtTime:timestamp sessionID:sessionID];
+    }
+}
+
+- (void) onConnection:(FWebSocketConnection *)conn readyAtTime:(NSNumber *)timestamp sessionID:(NSString *)sessionID {
+    FFLog(@"I-RDB082014", @"Realtime connection established");
+    state = REALTIME_STATE_CONNECTED;
+    
+    [self.delegate onReady:self atTime:timestamp sessionID:sessionID];
+}
+
+- (void) onReset:(NSString *)host {
+    FFLog(@"I-RDB082015", @"Got a reset; killing connection to: %@; Updating internalHost to: %@", repoInfo.internalHost, host);
+    self.repoInfo.internalHost = host;
+
+    // Explicitly close the connection with SERVER_RESET so calling code knows to reconnect immediately.
+    [self closeWithReason:DISCONNECT_REASON_SERVER_RESET];
+}
+
+@end