Check if connection is available on creating a client (#23)

Check if connection is available on creating a client

src/__test__/integration/builtins.spec.ts

@@ -12,6 +12,7 @@ import {
 } from '../../internal/builtins';
 import { ModuleConfig } from '../../internal/moduleConfig';
 import { createConnectedClient } from '../util';
+import {checkConnection} from "../../api";
 
 const dev2multiaddr = '/dns4/dev.fluence.dev/tcp/19003/wss/p2p/12D3KooWBUJifCTgaxAUrcM9JysqCcS4CS8tiYH5hExbdWCAoNwb';
 const dev3multiaddr = '/dns4/dev.fluence.dev/tcp/19004/wss/p2p/12D3KooWJbJFaZ3k5sNd8DjQgg3aERoKtBAnirEvPV8yp76kEXHB';
@@ -43,6 +44,14 @@ describe('Builtins usage suite', () => {
         expect(bpList).not.toBeUndefined;
     });
 
+    it('check_connection', async function () {
+        const client = await createConnectedClient(dev2multiaddr);
+
+        let isConnected = await checkConnection(client);
+
+        expect(isConnected).toEqual(true);
+    });
+
     it('upload_modules', async function () {
         const client = await createConnectedClient(dev2multiaddr);
 

src/__test__/integration/client.spec.ts

@@ -40,8 +40,7 @@ describe('Typescript usage suite', () => {
 
             await client.sendScript(script, data);
 
-            const res = await resMakingPromise;
-            return res;
+            return await resMakingPromise;
         };
 
         it('address as string', async function () {
@@ -198,13 +197,8 @@ describe('Typescript usage suite', () => {
 
     it('two clients should work inside the same time browser', async function () {
         // arrange
-        const pid1 = await generatePeerId();
-        const client1 = new FluenceClientImpl(pid1);
-        await client1.connect(devNodeAddress);
-
-        const pid2 = await generatePeerId();
-        const client2 = new FluenceClientImpl(pid2);
-        await client2.connect(devNodeAddress);
+        const client1 = await createConnectedClient(devNodeAddress);
+        const client2 = await createConnectedClient(devNodeAddress);
 
         let resMakingPromise = new Promise((resolve) => {
             client2.registerCallback('test', 'test', (args, _) => {
@@ -216,7 +210,7 @@ describe('Typescript usage suite', () => {
         let script = `
             (seq
                 (call "${client1.relayPeerId}" ("op" "identity") [])
-                (call "${pid2.toB58String()}" ("test" "test") [a b c d])
+                (call "${client2.selfPeerId}" ("test" "test") [a b c d])
             )
         `;
 
@@ -234,13 +228,8 @@ describe('Typescript usage suite', () => {
 
     it('event registration should work', async function () {
         // arrange
-        const pid1 = await generatePeerId();
-        const client1 = new FluenceClientImpl(pid1);
-        await client1.connect(devNodeAddress);
-
-        const pid2 = await generatePeerId();
-        const client2 = new FluenceClientImpl(pid2);
-        await client2.connect(devNodeAddress);
+        const client1 = await createConnectedClient(devNodeAddress);
+        const client2 = await createConnectedClient(devNodeAddress);
 
         client2.registerEvent('event_stream', 'test');
         const resMakingPromise = new Promise((resolve) => {
@@ -249,7 +238,7 @@ describe('Typescript usage suite', () => {
 
         // act
         let script = `
-            (call "${pid2.toB58String()}" ("event_stream" "test") [hello])
+            (call "${client2.selfPeerId}" ("event_stream" "test") [hello])
         `;
 
         let data: Map<string, any> = new Map();

src/api.ts

@@ -5,6 +5,7 @@ import Multiaddr from 'multiaddr';
 import PeerId, { isPeerId } from 'peer-id';
 import { generatePeerId, seedToPeerId } from './internal/peerIdUtils';
 import { FluenceClientImpl } from './internal/FluenceClientImpl';
+import log from "loglevel";
 
 type Node = {
     peerId: string;
@@ -44,6 +45,9 @@ export const createClient = async (
         }
 
         await client.connect(theAddress);
+        if (!await checkConnection(client)) {
+            throw new Error("Connection check failed. Check if the node is working or try to connect to another node")
+        }
     }
 
     return client;
@@ -147,7 +151,43 @@ export const sendParticleAsFetch = async <T>(
         }, particle.ttl);
     });
 
-    sendParticle(client, particle);
+    await sendParticle(client, particle);
 
     return promise;
 };
+
+export const checkConnection = async (client: FluenceClient): Promise<boolean> => {
+    let msg = Math.random().toString(36).substring(7);
+    let callbackFn = "checkConnection"
+    let callbackService = "_callback"
+
+    const particle = new Particle(
+        `
+                    (seq 
+                        (call __relay ("op" "identity") [msg] result)
+                        (call myPeerId ("${callbackService}" "${callbackFn}") [result])
+                    )
+                `,
+        {
+            __relay: client.relayPeerId,
+            myPeerId: client.selfPeerId,
+            msg
+        },
+        3000
+    );
+
+    if (!client.isConnected) {
+        return false;
+    }
+
+    try {
+        let result = await sendParticleAsFetch<string[][]>(client, particle, callbackFn, callbackService)
+        if (result[0][0] != msg) {
+            log.warn("unexpected behavior. 'identity' must return arguments the passed arguments.")
+        }
+        return true;
+    } catch (e) {
+        log.error("Error on establishing connection: ", e)
+        return false;
+    }
+}