From 270bf0997d293be4c8c68fc58a9208377f8c213d Mon Sep 17 00:00:00 2001
From: Vitaly Takmazov
Date: Wed, 30 Dec 2020 07:52:01 +0300
Subject: No need to duplicate session background queue

---
 Juick/API.m | 71 ++++++++++++++++++++++++++++++++++---------------------------
 1 file changed, 40 insertions(+), 31 deletions(-)

diff --git a/Juick/API.m b/Juick/API.m
index 4f57dc6..a18b9b1 100644
--- a/Juick/API.m
+++ b/Juick/API.m
@@ -10,7 +10,6 @@
 #import "API.h"
 
 @interface API ()
-@property(nonatomic, strong) NSOperationQueue *backgroundQueue;
 @property(nonatomic, strong) NSURL *baseURL;
 @property(nonatomic, strong) NSURLSession *urlSession;
 
@@ -26,7 +25,6 @@
         NSString *baseURLString = [[NSBundle mainBundle] objectForInfoDictionaryKey:@"base_url"];
         NSLog(@"Initializing with %@ base URL", baseURLString);
         self.baseURL = [NSURL URLWithString:baseURLString];
-        self.backgroundQueue = [NSOperationQueue new];
         self.urlSession = [NSURLSession sharedSession];
     }
     return self;
@@ -52,7 +50,10 @@
                 User *me = [User fromJSON:jsonData];
                 [[NSUserDefaults standardUserDefaults] setValue:me.token forKeyPath:@"token"];
                 self.currentUser = me;
-                completed(YES);
+                [[NSOperationQueue mainQueue] addOperationWithBlock:^{
+                    completed(YES);
+                }];
+                
             }
         }
         completed(NO);
@@ -115,13 +116,11 @@
 }
 
 -(void) postPMToUser:(NSString *)uname text:(NSString *)text result:(void (^)(NSError *))callback {
-    [self.backgroundQueue addOperationWithBlock:^{
-        [self post:@"pm" params:@{
-            @"uname": uname,
-            @"body": text
-        } callback:^(NSDictionary *response, NSError *err) {
-            callback(err);
-        }];
+    [self post:@"pm" params:@{
+        @"uname": uname,
+        @"body": text
+    } callback:^(NSDictionary *response, NSError *err) {
+        callback(err);
     }];
 }
 
@@ -177,7 +176,9 @@
     NSDictionary *token = [registrationData toJSON];
     NSData *jsonData = [NSJSONSerialization dataWithJSONObject:@[token] options:kNilOptions error:&error];
     [self fetchDataWithURL:notificationsUrl data:jsonData boundary:nil authorizationHeader:self.authorizationHeader callback:^(NSData *response, NSError *err) {
-        callback(!err);
+        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
+            callback(!err);
+        }];
     }];
 }
 
@@ -201,9 +202,7 @@
     
     NSURLSessionDataTask *task = [self.urlSession dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
         if (error) {
-            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
-                callback(nil, error);
-            }];
+            callback(nil, error);
         } else {
             NSInteger statusCode = ((NSHTTPURLResponse *)response).statusCode;
             if (!response || statusCode != 200) {
@@ -211,19 +210,13 @@
                 NSError *err = [NSError errorWithDomain:@"JuickErrorDomain"
                                                    code:statusCode
                                                userInfo:@{@"url": url.absoluteString}];
-                [[NSOperationQueue mainQueue] addOperationWithBlock:^{
-                    callback(nil, err);
-                }];
+                callback(nil, err);
             } else {
-                [[NSOperationQueue mainQueue] addOperationWithBlock:^{
-                    callback(data, error);
-                }];
+                callback(data, error);
             }
         }
     }];
-    [self.backgroundQueue addOperationWithBlock:^{
-        [task resume];
-    }];
+    [task resume];
 }
 
 -(NSURL *) url:(NSURL *)url withParameters:(NSDictionary *)params {
@@ -253,14 +246,20 @@
     NSURL *requestUrl = params ? [self url:url withParameters:params] : url;
     [self fetchDataWithURL:requestUrl data:nil boundary:nil authorizationHeader:self.authorizationHeader callback:^(NSData *data, NSError *err) {
         if (err) {
-            callback(nil, err);
+            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
+                callback(nil, err);
+            }];
         } else {
             NSError *jsonError;
             NSDictionary *jsonData = [NSJSONSerialization JSONObjectWithData:data options:0 error:&jsonError];
             if (jsonError) {
-                callback(nil, jsonError);
+                [[NSOperationQueue mainQueue] addOperationWithBlock:^{
+                    callback(nil, jsonError);
+                }];
             } else {
-                callback(jsonData, nil);
+                [[NSOperationQueue mainQueue] addOperationWithBlock:^{
+                    callback(jsonData, nil);
+                }];
             }
         }
     }];
@@ -275,12 +274,18 @@
             NSError *jsonError;
             NSDictionary *jsonData = [NSJSONSerialization JSONObjectWithData:data options:0 error:&jsonError];
             if (jsonError) {
-                callback(nil, jsonError);
+                [[NSOperationQueue mainQueue] addOperationWithBlock:^{
+                    callback(nil, jsonError);
+                }];
             } else {
-                callback(jsonData, nil);
+                [[NSOperationQueue mainQueue] addOperationWithBlock:^{
+                    callback(jsonData, nil);
+                }];
             }
         } else {
-            callback(nil, err);
+            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
+                callback(nil, err);
+            }];
         }
     }];
 }
@@ -288,9 +293,13 @@
 -(void) fetchImageWithURL:(NSURL *) url callback:(void(^)(NSData *))callback {
     [self fetchDataWithURL:url data:nil boundary:nil authorizationHeader:self.authorizationHeader callback:^(NSData *data, NSError *err) {
         if (err) {
-            callback(nil);
+            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
+                callback(nil);
+            }];
         } else {
-            callback(data);
+            [[NSOperationQueue mainQueue] addOperationWithBlock:^{
+                callback(data);
+            }];
         }
     }];
 }
-- 
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