Add exit node selection to the clients

server/routers/olm/handleOlmExitNodesRequestMessage.ts

@@ -0,0 +1,93 @@
+import { db, clients } from "@server/db";
+import { MessageHandler } from "@server/routers/ws";
+import { exitNodes, Olm } from "@server/db";
+import logger from "@server/logger";
+import { eq } from "drizzle-orm";
+import { listExitNodes } from "#dynamic/lib/exitNodes";
+import { calculateExitNodeWeight } from "@server/lib/exitNodes";
+
+export const handleOlmExitNodesRequestMessage: MessageHandler = async (
+    context
+) => {
+    const { message, client: olmClient, sendToClient } = context;
+    const olm = olmClient as Olm;
+
+    logger.info("Handling exit nodes request olm message!");
+
+    if (!olm) {
+        logger.warn("olm not found");
+        return;
+    }
+
+    // Get the olm's orgId through the client relationship
+    if (!olm.clientId) {
+        logger.warn("olm clientId not found");
+        return;
+    }
+
+    const [client] = await db
+        .select({ orgId: clients.orgId })
+        .from(clients)
+        .where(eq(clients.clientId, olm.clientId))
+        .limit(1);
+
+    if (!client || !client.orgId) {
+        logger.warn("client not found");
+        return;
+    }
+
+    const { noCloud, chainId } = message.data;
+
+    const exitNodesList = await listExitNodes(
+        client.orgId,
+        true,
+        noCloud || false,
+        olm.clientId
+    ); // filter for only the online ones
+
+    let lastExitNodeId = null;
+    if (olm.clientId) {
+        const [lastExitNode] = await db
+            .select()
+            .from(clients)
+            .where(eq(clients.clientId, olm.clientId))
+            .limit(1);
+        lastExitNodeId = lastExitNode?.exitNodeId || null;
+    }
+
+    const exitNodesPayload = await Promise.all(
+        exitNodesList.map(async (node) => {
+            const weight = await calculateExitNodeWeight(
+                node.exitNodeId,
+                node.maxConnections
+            );
+
+            if (weight === null) {
+                return null;
+            }
+
+            return {
+                exitNodeId: node.exitNodeId,
+                exitNodeName: node.name,
+                endpoint: node.endpoint,
+                weight,
+                wasPreviouslyConnected: node.exitNodeId === lastExitNodeId
+            };
+        })
+    );
+
+    // filter out null values
+    const filteredExitNodes = exitNodesPayload.filter((node) => node !== null);
+
+    return {
+        message: {
+            type: "olm/ping/exitNodes",
+            data: {
+                exitNodes: filteredExitNodes,
+                chainId: chainId
+            }
+        },
+        broadcast: false, // Send to all clients
+        excludeSender: false // Include sender in broadcast
+    };
+};

server/routers/olm/handleOlmRegisterMessage.ts

@@ -22,6 +22,7 @@ import { canCompress } from "@server/lib/clientVersionChecks";
 import config from "@server/lib/config";
 import cache from "#dynamic/lib/cache"; // not using regional here because we need this in the register message handler before we know where the client is
 import { waitForClientRebuildIdle } from "@server/lib/rebuildClientAssociations";
+import { ExitNodePingResult, selectBestExitNode } from "#dynamic/lib/exitNodes";
 
 const HOLEPUNCH_STALE_CHAIN_THRESHOLD = 18;
 const HOLEPUNCH_STALE_CHAIN_TTL_SECONDS = 1800;
@@ -49,6 +50,7 @@ export const handleOlmRegisterMessage: MessageHandler = async (context) => {
         olmAgent,
         orgId,
         userToken,
+        pingResults,
         fingerprint,
         postures,
         chainId
@@ -284,7 +286,22 @@ export const handleOlmRegisterMessage: MessageHandler = async (context) => {
         return;
     }
 
-    if (client.pubKey !== publicKey || client.archived) {
+    let exitNodeId: number | undefined;
+    if (pingResults) {
+        const bestPingResult = selectBestExitNode(
+            pingResults as ExitNodePingResult[]
+        );
+        if (!bestPingResult) {
+            logger.warn("No suitable exit node found based on ping results");
+        }
+        exitNodeId = bestPingResult?.exitNodeId;
+    }
+
+    if (
+        client.pubKey !== publicKey ||
+        client.archived ||
+        client.exitNodeId !== exitNodeId
+    ) {
         logger.info(
             "[handleOlmRegisterMessage] Public key mismatch. Updating public key and clearing session info...",
             { orgId: client.orgId, clientId: client.clientId }
@@ -294,7 +311,8 @@ export const handleOlmRegisterMessage: MessageHandler = async (context) => {
             .update(clients)
             .set({
                 pubKey: publicKey,
-                archived: false
+                archived: false,
+                exitNodeId: exitNodeId // this can be undefined if no exit node was selected, which is fine just means we cant talk to the node or connect to it
             })
             .where(eq(clients.clientId, client.clientId));