Show spinning cog if we are calculating the proof of work.

Signal/Images.xcassets/message_status_pow.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "pow.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "pow@2x.png",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "filename" : "pow@3x.png",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

Signal/src/ViewControllers/ConversationView/Cells/OWSMessageFooterView.m

@@ -122,6 +122,10 @@ NS_ASSUME_NONNULL_BEGIN
         MessageReceiptStatus messageStatus =
             [MessageRecipientStatusUtils recipientStatusWithOutgoingMessage:outgoingMessage];
         switch (messageStatus) {
+            case MessageReceiptStatusCalculatingPoW:
+                statusIndicatorImage = [UIImage imageNamed:@"message_status_pow"];
+                [self animateSpinningIcon];
+                break;
             case MessageReceiptStatusUploading:
             case MessageReceiptStatusSending:
                 statusIndicatorImage = [UIImage imageNamed:@"message_status_sending"];

Signal/src/ViewControllers/HomeView/HomeViewCell.m

@@ -308,6 +308,10 @@ NS_ASSUME_NONNULL_BEGIN
             MessageReceiptStatus messageStatus =
                 [MessageRecipientStatusUtils recipientStatusWithOutgoingMessage:outgoingMessage];
             switch (messageStatus) {
+                case MessageReceiptStatusCalculatingPoW:
+                    statusIndicatorImage = [UIImage imageNamed:@"message_status_pow"];
+                    shouldAnimateStatusIcon = YES;
+                    break;
                 case MessageReceiptStatusUploading:
                 case MessageReceiptStatusSending:
                     statusIndicatorImage = [UIImage imageNamed:@"message_status_sending"];

Signal/src/ViewControllers/MessageDetailViewController.swift

@@ -603,6 +603,9 @@ class MessageDetailViewController: OWSViewController, MediaGalleryDataSourceDele
 
     private func string(for messageReceiptStatus: MessageReceiptStatus) -> String {
         switch messageReceiptStatus {
+        case .calculatingPoW:
+            return NSLocalizedString("Calculating proof of work",
+                                     comment: "Status label for messages which are calculating proof of work.")
         case .uploading:
             return NSLocalizedString("MESSAGE_METADATA_VIEW_MESSAGE_STATUS_UPLOADING",
                               comment: "Status label for messages which are uploading.")

Signal/src/ViewControllers/Utils/MessageRecipientStatusUtils.swift

@@ -14,6 +14,7 @@ import SignalMessaging
     case read
     case failed
     case skipped
+    case calculatingPoW
 }
 
 @objc
@@ -109,6 +110,11 @@ public class MessageRecipientStatusUtils: NSObject {
             // Use the "long" version of this message here.
             return (.failed, NSLocalizedString("MESSAGE_STATUS_FAILED", comment: "status message for failed messages"))
         case .sending:
+            if outgoingMessage.isCalculatingPoW {
+                return (.calculatingPoW, NSLocalizedString("Calculating proof of work",
+                                                    comment: "message status while calculating proof of work."))
+            }
+
             if outgoingMessage.hasAttachments() {
                 return (.uploading, NSLocalizedString("MESSAGE_STATUS_UPLOADING",
                                          comment: "status message while attachment is uploading"))
@@ -164,6 +170,8 @@ public class MessageRecipientStatusUtils: NSObject {
             return "failed"
         case .skipped:
             return "skipped"
+        case .calculatingPoW:
+            return "calculatingPoW"
         }
     }
 }

Signal/translations/en.lproj/Localizable.strings

@@ -2568,3 +2568,4 @@
 "Start a Conversation" = "Start a Conversation";
 "Invalid public key" = "Invalid public key";
 "No search results" = "No search results";
+"Calculating proof of work" = "Calculating proof of work";

SignalServiceKit/src/Messages/Interactions/TSOutgoingMessage.h

@@ -141,6 +141,9 @@ typedef NS_ENUM(NSInteger, TSGroupMetaMessage) {
 
 @property (nonatomic, readonly) BOOL isOnline;
 
+// Loki: Bool to indicate if proof of work is being calculated for this message
+@property (atomic, readonly) BOOL isCalculatingPoW;
+
 /**
  * The data representation of this message, to be encrypted, before being sent.
  */
@@ -183,6 +186,9 @@ typedef NS_ENUM(NSInteger, TSGroupMetaMessage) {
 
 #pragma mark - Update With... Methods
 
+// When sending a message, when proof of work calculation is started, we should mark it as such
+- (void)updateIsCalculatingProofOfWorkWithTransaction:(YapDatabaseReadWriteTransaction *)transaction;
+
 // This method is used to record a successful send to one recipient.
 - (void)updateWithSentRecipient:(NSString *)recipientId
                     wasSentByUD:(BOOL)wasSentByUD

SignalServiceKit/src/Messages/Interactions/TSOutgoingMessage.m

@@ -91,6 +91,8 @@ NSString *NSStringForOutgoingMessageRecipientState(OWSOutgoingMessageRecipientSt
 
 @property (atomic, nullable) NSDictionary<NSString *, TSOutgoingMessageRecipientState *> *recipientStateMap;
 
+@property (atomic) BOOL isCalculatingPoW;
+
 @end
 
 #pragma mark -
@@ -323,6 +325,7 @@ NSString *NSStringForOutgoingMessageRecipientState(OWSOutgoingMessageRecipientSt
     }
 
     _hasSyncedTranscript = NO;
+    _isCalculatingPoW = NO;
 
     if ([thread isKindOfClass:TSGroupThread.class]) {
         // Unless specified, we assume group messages are "Delivery" i.e. normal messages.
@@ -607,6 +610,7 @@ NSString *NSStringForOutgoingMessageRecipientState(OWSOutgoingMessageRecipientSt
                                      }
                                  }
                                  [message setMostRecentFailureText:error.localizedDescription];
+                                 [message setIsCalculatingPoW:false];
                              }];
 }
 
@@ -623,6 +627,7 @@ NSString *NSStringForOutgoingMessageRecipientState(OWSOutgoingMessageRecipientSt
                                          recipientState.state = OWSOutgoingMessageRecipientStateFailed;
                                      }
                                  }
+                                 [message setIsCalculatingPoW:false];
                              }];
 }
 
@@ -669,6 +674,16 @@ NSString *NSStringForOutgoingMessageRecipientState(OWSOutgoingMessageRecipientSt
     }];
 }
 
+- (void)updateIsCalculatingProofOfWorkWithTransaction:(YapDatabaseReadWriteTransaction *)transaction
+{
+    OWSAssertDebug(transaction);
+    
+    [self applyChangeToSelfAndLatestCopy:transaction
+                             changeBlock:^(TSOutgoingMessage *message) {
+                                 [message setIsCalculatingPoW:true];
+                             }];
+}
+
 - (void)updateWithSentRecipient:(NSString *)recipientId
                     wasSentByUD:(BOOL)wasSentByUD
                     transaction:(YapDatabaseReadWriteTransaction *)transaction {
@@ -685,6 +700,7 @@ NSString *NSStringForOutgoingMessageRecipientState(OWSOutgoingMessageRecipientSt
                                  }
                                  recipientState.state = OWSOutgoingMessageRecipientStateSent;
                                  recipientState.wasSentByUD = wasSentByUD;
+                                 [message setIsCalculatingPoW:false];
                              }];
 }
 
@@ -702,6 +718,7 @@ NSString *NSStringForOutgoingMessageRecipientState(OWSOutgoingMessageRecipientSt
                                      return;
                                  }
                                  recipientState.state = OWSOutgoingMessageRecipientStateSkipped;
+                                 [message setIsCalculatingPoW:false];
                              }];
 }
 
@@ -730,6 +747,7 @@ NSString *NSStringForOutgoingMessageRecipientState(OWSOutgoingMessageRecipientSt
                                  }
                                  recipientState.state = OWSOutgoingMessageRecipientStateSent;
                                  recipientState.deliveryTimestamp = deliveryTimestamp;
+                                 [message setIsCalculatingPoW:false];
                              }];
 }
 
@@ -753,6 +771,7 @@ NSString *NSStringForOutgoingMessageRecipientState(OWSOutgoingMessageRecipientSt
                                  }
                                  recipientState.state = OWSOutgoingMessageRecipientStateSent;
                                  recipientState.readTimestamp = @(readTimestamp);
+                                 [message setIsCalculatingPoW:false];
                              }];
 }
 
@@ -821,6 +840,8 @@ NSString *NSStringForOutgoingMessageRecipientState(OWSOutgoingMessageRecipientSt
                                        }
                                    }
                                }
+                               
+                               [message setIsCalculatingPoW:false];
 
                                if (!isSentUpdate) {
                                    [message setIsFromLinkedDevice:YES];

SignalServiceKit/src/Messages/OWSMessageSender.m

@@ -929,7 +929,7 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
                 NSString *destination = message[@"destination"];
                 NSString *data = message[@"content"];
 
-                NSString *_Nullable nonce = [ProofOfWork calculateForData:data pubKey:destination timestamp:timestamp.unsignedIntegerValue ttl:ttl.integerValue];
+                NSString *_Nullable nonce = [ProofOfWork calculateWithData:data pubKey:destination timestamp:timestamp.unsignedIntegerValue ttl:ttl.integerValue];
                 
                 // Return our timestamp along with the nonce
                 // These will help us identify which nonce belongs to which message
@@ -1126,7 +1126,8 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
         return messageSend.failure(error);
     }
     
-    // TODO: Update message here to show the pow cog icon
+    // Update the state to show that proof of work is being calculated
+    [self calculatingProofOfWorkFor:messageSend];
     
     // Loki: Calculate the proof of work for each device message
     NSNumber *ttl = [NSNumber numberWithInteger:@(4 * 24 * 60 * 60)];
@@ -1205,6 +1206,16 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
         }) retainUntilComplete];
 }
 
+- (void)calculatingProofOfWorkFor:(OWSMessageSend *)messageSend
+{
+    OWSAssertDebug(messageSend);
+    dispatch_async([OWSDispatch sendingQueue], ^{
+        [self.dbConnection readWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
+            [messageSend.message updateIsCalculatingProofOfWorkWithTransaction:transaction];
+        }];
+    });
+}
+
 - (void)messageSendDidSucceed:(OWSMessageSend *)messageSend
                deviceMessages:(NSArray<NSDictionary *> *)deviceMessages
                   wasSentByUD:(BOOL)wasSentByUD