fix: findNode and getClosestGlobalNodes no longer throws `ErrorNo…

…deGraphEmptyDatabase` with empty network

`getClosestGlobalNodes` was throwing `ErrorNodeGraphEmptyDatabase` when it failed to get new nodes during the search process. Now it just returns undefined as expected.

Related #398

src/nodes/NodeConnectionManager.ts

@@ -449,9 +449,10 @@ class NodeConnectionManager {
       this.initialClosestNodes,
     );
     // If we have no nodes at all in our database (even after synchronising),
-    // then we should throw an eor. We aren't going to find any others
+    // then we should return nothing. We aren't going to find any others
     if (shortlist.length === 0) {
-      throw new nodesErrors.ErrorNodeGraphEmptyDatabase();
+      this.logger.warn('Node graph was empty, No nodes to query');
+      return;
     }
     // Need to keep track of the nodes that have been contacted
     // Not sufficient to simply check if there's already a pre-existing connection

src/nodes/errors.ts

@@ -37,11 +37,6 @@ class ErrorNodeGraphNodeIdNotFound<T> extends ErrorNodes<T> {
   exitCode = sysexits.NOUSER;
 }
 
-class ErrorNodeGraphEmptyDatabase<T> extends ErrorNodes<T> {
-  static description = 'NodeGraph database was empty';
-  exitCode = sysexits.USAGE;
-}
-
 class ErrorNodeGraphOversizedBucket<T> extends ErrorNodes<T> {
   static description: 'Bucket invalidly contains more nodes than capacity';
   exitCode = sysexits.USAGE;
@@ -101,7 +96,6 @@ export {
   ErrorNodeGraphNotRunning,
   ErrorNodeGraphDestroyed,
   ErrorNodeGraphNodeIdNotFound,
-  ErrorNodeGraphEmptyDatabase,
   ErrorNodeGraphOversizedBucket,
   ErrorNodeGraphSameNodeId,
   ErrorNodeGraphBucketIndex,

tests/nodes/NodeManager.test.ts

@@ -1104,7 +1104,7 @@ describe(`${NodeManager.name} test`, () => {
       'refreshBucket',
     );
     try {
-      logger.setLevel(LogLevel.DEBUG);
+      logger.setLevel(LogLevel.WARN);
       await queue.start();
       await nodeManager.start();
       await nodeConnectionManager.start({ nodeManager });
@@ -1145,4 +1145,22 @@ describe(`${NodeManager.name} test`, () => {
       await queue.stop();
     }
   });
+  test('refreshBucket should not throw errors when network is empty', async () => {
+    const nodeManager = new NodeManager({
+      db,
+      sigchain: {} as Sigchain,
+      keyManager,
+      nodeGraph,
+      nodeConnectionManager,
+      queue,
+      refreshBucketTimerDefault: 10000000,
+      logger,
+    });
+    await nodeConnectionManager.start({ nodeManager });
+    try {
+      await expect(nodeManager.refreshBucket(100)).resolves.not.toThrow();
+    } finally {
+      await nodeManager.stop();
+    }
+  });
 });