Smoothing over initial connection issues

server/lib/exitNodes/shared.ts

@@ -0,0 +1,30 @@
+import { db, exitNodes } from "@server/db";
+import config from "@server/lib/config";
+import { findNextAvailableCidr } from "@server/lib/ip";
+
+export async function getNextAvailableSubnet(): Promise<string> {
+    // Get all existing subnets from routes table
+    const existingAddresses = await db
+        .select({
+            address: exitNodes.address
+        })
+        .from(exitNodes);
+
+    const addresses = existingAddresses.map((a) => a.address);
+    let subnet = findNextAvailableCidr(
+        addresses,
+        config.getRawConfig().gerbil.block_size,
+        config.getRawConfig().gerbil.subnet_group
+    );
+    if (!subnet) {
+        throw new Error("No available subnets remaining in space");
+    }
+
+    // replace the last octet with 1
+    subnet =
+        subnet.split(".").slice(0, 3).join(".") +
+        ".1" +
+        "/" +
+        subnet.split("/")[1];
+    return subnet;
+}