From c1295d7c644887f8dbec02400b7427c4a5972c2f Mon Sep 17 00:00:00 2001
From: Philipp Arndt <2f.mail@gmx.de>
Date: Sun, 11 Jun 2023 13:37:31 +0200
Subject: [PATCH] improve api "ping" (#139)

local DNS could resolve even when API is not reachable
---
 app/lib/connection.ts       | 33 ++++++++++++++++-----------------
 app/lib/miele/miele.test.ts |  6 +++++-
 app/lib/miele/miele.ts      | 15 +++++++++++++++
 3 files changed, 36 insertions(+), 18 deletions(-)

diff --git a/app/lib/connection.ts b/app/lib/connection.ts
index 2f6e6cb..dfccb34 100644
--- a/app/lib/connection.ts
+++ b/app/lib/connection.ts
@@ -1,6 +1,6 @@
-import dns from "dns"
 import { getAppConfig } from "./config/config"
 import { log } from "./logger"
+import { ping } from "./miele/miele"
 
 let checkConnection: ReturnType<typeof setTimeout>
 let connectionLost = false
@@ -17,23 +17,22 @@ export const registerConnectionCheck = (restartHook: () => Promise<void>, config
     }
     log.info("Internet connection will be checked every", { ms: interval })
     connectionLost = false
-    checkConnection = setInterval(() => {
+    checkConnection = setInterval(async () => {
         log.debug("Checking connection")
-        dns.resolve("api.mcs3.miele.com", (err) => {
-            if (err) {
-                log.debug("Connection check failed", err)
-                if (!connectionLost) {
-                    connectionLost = true
-                    log.error("Connection lost. Waiting for connection to come back.", err)
-                }
-            }
-            else if (connectionLost) {
-                log.debug("Connection check success after connection was lost")
-                restartHook().then()
-            }
-            else {
-                log.debug("Connection check success")
+
+        if (!await ping()) {
+            log.debug("Connection check failed")
+            if (!connectionLost) {
+                connectionLost = true
+                log.error("Connection lost. Waiting for connection to come back.")
             }
-        })
+        }
+        else if (connectionLost) {
+            log.debug("Connection check success after connection was lost")
+            restartHook().then()
+        }
+        else {
+            log.debug("Connection check success")
+        }
     }, interval)
 }
diff --git a/app/lib/miele/miele.test.ts b/app/lib/miele/miele.test.ts
index 3363441..b8ade41 100644
--- a/app/lib/miele/miele.test.ts
+++ b/app/lib/miele/miele.test.ts
@@ -2,7 +2,7 @@ import { JEST_INTEGRATION_TIMEOUT } from "../../test/test-utils"
 import { applyConfig } from "../config/config"
 import { log } from "../logger"
 import { getToken } from "./login/login"
-import { fetchDevices, smallMessage } from "./miele"
+import { fetchDevices, ping, smallMessage } from "./miele"
 import { testConfig } from "./miele-testutils"
 
 jest.setTimeout(JEST_INTEGRATION_TIMEOUT)
@@ -38,4 +38,8 @@ describe("miele", () => {
             state: "UNKNOWN"
         })
     })
+
+    test("ping", async () => {
+        expect(await ping()).toBeTruthy()
+    })
 })
diff --git a/app/lib/miele/miele.ts b/app/lib/miele/miele.ts
index 1131048..2058e9c 100644
--- a/app/lib/miele/miele.ts
+++ b/app/lib/miele/miele.ts
@@ -50,3 +50,18 @@ export const smallMessage = (device: MieleDevice) => {
         timeCompleted: formatTime(add(new Date(), remainingDuration))
     }
 }
+
+export const ping = async () => {
+    log.debug("Trying to access Miele endpoint")
+    try {
+        await axios.get(
+            "https://api.mcs3.miele.com/thirdparty/login/"
+        )
+        log.debug("Accessing Miele endpoint success")
+        return true
+    }
+    catch (e) {
+        log.debug("Accessing Miele endpoint failed")
+        return false
+    }
+}