From d8f583cb795f81d55335141a277626c0ec247d1f Mon Sep 17 00:00:00 2001
From: rowanbeentje <rowan@beent.je>
Date: Mon, 9 Mar 2009 23:32:06 +0000
Subject: Additional error checking, centralised connection keep-alive interval
 retrieval, and support for disabling keep-alive by setting the interval to 0.

---
 Source/CMMCPConnection.h |  1 +
 Source/CMMCPConnection.m | 42 ++++++++++++++++++++++++++++++++----------
 2 files changed, 33 insertions(+), 10 deletions(-)

diff --git a/Source/CMMCPConnection.h b/Source/CMMCPConnection.h
index 584b8056..e6479eb1 100644
--- a/Source/CMMCPConnection.h
+++ b/Source/CMMCPConnection.h
@@ -71,6 +71,7 @@
 - (void) setDelegate:(id)object;
 - (NSTimeZone *) timeZone;
 - (BOOL) pingConnection;
+- (double) keepAliveInterval;
 - (void) startKeepAliveTimerResettingState:(BOOL)resetState;
 - (void) stopKeepAliveTimer;
 - (void) keepAlive:(NSTimer *)theTimer;
diff --git a/Source/CMMCPConnection.m b/Source/CMMCPConnection.m
index 14cd6ba7..109ab280 100644
--- a/Source/CMMCPConnection.m
+++ b/Source/CMMCPConnection.m
@@ -68,7 +68,9 @@ static void forcePingTimeout(int signalNumber);
 	connectionSocket = nil;
 	keepAliveTimer = nil;
 	lastKeepAliveSuccess = nil;
-	[NSBundle loadNibNamed:@"ConnectionErrorDialog" owner:self];
+	if (![NSBundle loadNibNamed:@"ConnectionErrorDialog" owner:self]) {
+		NSLog(@"Connection error dialog could not be loaded; connection failure handling will not function correctly.");
+	}
 }
 
 
@@ -567,11 +569,28 @@ static void forcePingTimeout(int signalNumber)
 	longjmp(pingTimeoutJumpLocation, 1);
 }
 
+
+/*
+ * Returns the keepalive interval, or 0 if keepalive should be disabled.
+ * Sequel Pro draws this from the preferences with a default of 60 secs.
+ */
+- (double) keepAliveInterval
+{
+	double interval;
+
+	interval = [[[NSUserDefaults standardUserDefaults] objectForKey:@"keepAliveInterval"] doubleValue];
+	if (!interval) interval = 0;
+	
+	return interval;
+}
+
 /*
  * Restarts a keepalive to fire in the future.
  */
 - (void) startKeepAliveTimerResettingState:(BOOL)resetState
 {
+	double interval;
+
 	if (keepAliveTimer) [self stopKeepAliveTimer];
 	if (!mConnected) return;
 
@@ -579,14 +598,17 @@ static void forcePingTimeout(int signalNumber)
 		[lastKeepAliveSuccess release];
 		lastKeepAliveSuccess = nil;
 	}
-	
-	keepAliveTimer = [NSTimer
-						scheduledTimerWithTimeInterval:[[[NSUserDefaults standardUserDefaults] objectForKey:@"keepAliveInterval"] doubleValue]
-						target:self
-						selector:@selector(keepAlive:)
-						userInfo:nil
-						repeats:NO];
-	[keepAliveTimer retain];
+
+	interval = [self keepAliveInterval];
+	if (interval) {
+		keepAliveTimer = [NSTimer
+							scheduledTimerWithTimeInterval:interval
+							target:self
+							selector:@selector(keepAlive:)
+							userInfo:nil
+							repeats:NO];
+		[keepAliveTimer retain];
+	}
 }
 
 /*
@@ -612,7 +634,7 @@ static void forcePingTimeout(int signalNumber)
 	// cut but mysql doesn't pick up on the fact - see comment for pingConnection above.  The same
 	// forced-timeout approach cannot be used here on a background thread.
 	// When the connection is disconnected in code, these 5 "hanging" threads are automatically cleaned.
-	if (lastKeepAliveSuccess && [lastKeepAliveSuccess timeIntervalSinceNow] < -5 * [[[NSUserDefaults standardUserDefaults] objectForKey:@"keepAliveInterval"] doubleValue]) return;
+	if (lastKeepAliveSuccess && [lastKeepAliveSuccess timeIntervalSinceNow] < -5 * [self keepAliveInterval]) return;
 
 	[NSThread detachNewThreadSelector:@selector(threadedKeepAlive) toTarget:self withObject:nil];
 	[self startKeepAliveTimerResettingState:NO];
-- 
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