Improve minting/syncing status reporting

Added API call GET /admin/status which reports whether minting
is possible (have minting keys & up-to-date) and whether node is
currently attempting to sync.

Corresponding change to system tray mouseover text.

Corresponding text added to SysTray transaction resources.

src/main/java/org/qortal/api/model/NodeStatus.java

@@ -0,0 +1,15 @@
+package org.qortal.api.model;
+
+import javax.xml.bind.annotation.XmlAccessType;
+import javax.xml.bind.annotation.XmlAccessorType;
+
+@XmlAccessorType(XmlAccessType.FIELD)
+public class NodeStatus {
+
+	public boolean isMintingPossible;
+	public boolean isSynchronizing;
+
+	public NodeStatus() {
+	}
+
+}

src/main/java/org/qortal/api/resource/AdminResource.java

@@ -45,6 +45,7 @@ import org.qortal.api.ApiExceptionFactory;
 import org.qortal.api.Security;
 import org.qortal.api.model.ActivitySummary;
 import org.qortal.api.model.NodeInfo;
+import org.qortal.api.model.NodeStatus;
 import org.qortal.block.BlockChain;
 import org.qortal.controller.Controller;
 import org.qortal.controller.Synchronizer.SynchronizationResult;
@@ -120,6 +121,27 @@ public class AdminResource {
 		return nodeInfo;
 	}
 
+	@GET
+	@Path("/status")
+	@Operation(
+		summary = "Fetch node status",
+		responses = {
+			@ApiResponse(
+				content = @Content(mediaType = MediaType.APPLICATION_JSON, schema = @Schema(implementation = NodeStatus.class))
+			)
+		}
+	)
+	public NodeStatus status() {
+		Security.checkApiCallAllowed(request);
+
+		NodeStatus nodeStatus = new NodeStatus();
+
+		nodeStatus.isMintingPossible = Controller.getInstance().isMintingPossible();
+		nodeStatus.isSynchronizing = Controller.getInstance().isSynchronizing();
+
+		return nodeStatus;
+	}
+
 	@GET
 	@Path("/stop")
 	@Operation(

src/main/java/org/qortal/controller/Controller.java

@@ -133,6 +133,9 @@ public class Controller extends Thread {
 	/** Whether we can mint new blocks, as reported by BlockMinter. */
 	private volatile boolean isMintingPossible = false;
 
+	/** Whether we are attempting to synchronize. */
+	private volatile boolean isSynchronizing = false;
+
 	/** Latest block signatures from other peers that we know are on inferior chains. */
 	List<ByteArray> inferiorChainSignatures = new ArrayList<>();
 
@@ -245,6 +248,15 @@ public class Controller extends Thread {
 		return isStopping;
 	}
 
+	// For API use
+	public boolean isMintingPossible() {
+		return this.isMintingPossible;
+	}
+
+	public boolean isSynchronizing() {
+		return this.isSynchronizing;
+	}
+
 	// Entry point
 
 	public static void main(String[] args) {
@@ -497,7 +509,13 @@ public class Controller extends Thread {
 		int index = new SecureRandom().nextInt(peers.size());
 		Peer peer = peers.get(index);
 
+		isSynchronizing = true;
+		updateSysTray();
+
 		actuallySynchronize(peer, false);
+
+		isSynchronizing = false;
+		requestSysTrayUpdate = true;
 	}
 
 	public SynchronizationResult actuallySynchronize(Peer peer, boolean force) throws InterruptedException {
@@ -601,9 +619,17 @@ public class Controller extends Thread {
 
 		String connectionsText = Translator.INSTANCE.translate("SysTray", numberOfPeers != 1 ? "CONNECTIONS" : "CONNECTION");
 		String heightText = Translator.INSTANCE.translate("SysTray", "BLOCK_HEIGHT");
-		String mintingText = Translator.INSTANCE.translate("SysTray", isMintingPossible ? "MINTING_ENABLED" : "MINTING_DISABLED");
 
-		String tooltip = String.format("%s - %d %s - %s %d", mintingText, numberOfPeers, connectionsText, heightText, height);
+		String actionKey;
+		if (isMintingPossible)
+			actionKey = "MINTING_ENABLED";
+		else if (isSynchronizing)
+			actionKey = "SYNCHRONIZING_BLOCKCHAIN";
+		else
+			actionKey = "MINTING_DISABLED";
+		String actionText = Translator.INSTANCE.translate("SysTray", actionKey);
+
+		String tooltip = String.format("%s - %d %s - %s %d", actionText, numberOfPeers, connectionsText, heightText, height);
 		SysTray.getInstance().setToolTipText(tooltip);
 	}
 

src/main/resources/i18n/SysTray_en.properties

@@ -26,4 +26,6 @@ OPEN_UI = Open UI
 
 SYNCHRONIZE_CLOCK = Synchronize clock
 
+SYNCHRONIZING_BLOCKCHAIN = Synchronizing
+
 SYNCHRONIZING_CLOCK = Synchronizing clock

src/main/resources/i18n/SysTray_zh.properties

@@ -26,4 +26,6 @@ OPEN_UI = \u5F00\u542F\u754C\u9762
 
 SYNCHRONIZE_CLOCK = \u540C\u6B65\u65F6\u949F
 
+SYNCHRONIZING_BLOCKCHAIN = \u540C\u6B65\u533A\u5757\u94FE
+
 SYNCHRONIZING_CLOCK = \u540C\u6B65\u7740\u65F6\u949F