improve BTCPay server down detection and handling

capsulflask/__init__.py

@@ -19,7 +19,7 @@ from apscheduler.schedulers.background import BackgroundScheduler
 
 from capsulflask.shared import my_exec_info_message
 from capsulflask import hub_model, spoke_model, cli
-from capsulflask.btcpay import client as btcpay
+from capsulflask.payment import try_reconnnect_btcpay
 from capsulflask.http_client import MyHTTPClient
 
 class StdoutMockFlaskMail:
@@ -142,17 +142,8 @@ else:
 
 app.config['HTTP_CLIENT'] = MyHTTPClient(timeout_seconds=int(app.config['INTERNAL_HTTP_TIMEOUT_SECONDS']))
 
-app.config['BTCPAY_ENABLED'] = False
 if app.config['BTCPAY_URL'] != "":
-  try:
-    response = requests.get(app.config['BTCPAY_URL'])
-    if response.status_code == 200:
-      app.config['BTCPAY_CLIENT'] = btcpay.Client(api_uri=app.config['BTCPAY_URL'], pem=app.config['BTCPAY_PRIVATE_KEY'])
-      app.config['BTCPAY_ENABLED'] = True
-    else:
-      app.logger.warn(f"Can't reach BTCPAY_URL {app.config['BTCPAY_URL']}: Response status code: {response.status_code}. Capsul will work fine except cryptocurrency payments will not work.")
-  except:
-    app.logger.warn("unable to create btcpay client. Capsul will work fine except cryptocurrency payments will not work. The error was: " + my_exec_info_message(sys.exc_info()))
+  try_reconnnect_btcpay()
 
 # only start the scheduler and attempt to migrate the database if we are running the app.
 # otherwise we are running a CLI command.

capsulflask/console.py

@@ -423,7 +423,8 @@ def account_balance():
     has_vms=len(vms_billed)>0, 
     vms_billed=vms_billed,
     warning_text=warning_text,
-    btcpay_enabled=current_app.config["BTCPAY_ENABLED"],
+    btcpay_enabled=current_app.config["BTCPAY_URL"] != "",
+    btcpay_is_working="BTCPAY_CLIENT" in current_app.config,
     payments=list(map(
       lambda x: dict(
         dollars=x["dollars"], 

capsulflask/payment.py

@@ -22,6 +22,7 @@ from werkzeug.exceptions import abort
 from capsulflask.auth import account_required
 
 from capsulflask.db import get_model
+from capsulflask.btcpay import client as btcpay
 from capsulflask.shared import my_exec_info_message, get_account_balance, average_number_of_days_in_a_month
 
 bp = Blueprint("payment", __name__, url_prefix="/payment")
@@ -53,9 +54,13 @@ def validate_dollars(min: float, max: float):
 def btcpay_payment():
   errors = list()
 
-  if not current_app.config['BTCPAY_ENABLED']:
+  if current_app.config['BTCPAY_URL'] == "":
     flash("BTCPay is not enabled on this server")
     return redirect(url_for("console.account_balance"))
+  elif 'BTCPAY_CLIENT' not in current_app.config:
+    if not try_reconnnect_btcpay():
+      flash("can't contact the BTCPay server right now")
+      return redirect(url_for("console.account_balance"))
 
   if request.method == "POST":
     dollars, errors = validate_dollars(0.01, 1000.0)
@@ -94,6 +99,10 @@ def btcpay_payment():
 
 def poll_btcpay_session(invoice_id):
 
+  if 'BTCPAY_CLIENT' not in current_app.config:
+    if not try_reconnnect_btcpay():
+      return [503, "can't contact btcpay server"]
+
   invoice = None
   try:
     invoice = current_app.config['BTCPAY_CLIENT'].get_invoice(invoice_id)
@@ -130,6 +139,20 @@ def poll_btcpay_session(invoice_id):
   
   return [200, "ok"]
 
+def try_reconnnect_btcpay():
+  try:
+    response = requests.get(current_app.config['BTCPAY_URL'])
+    if response.status_code == 200:
+      current_app.config['BTCPAY_CLIENT'] = btcpay.Client(api_uri=current_app.config['BTCPAY_URL'], pem=current_app.config['BTCPAY_PRIVATE_KEY'])
+      return True
+    else:
+      current_app.logger.warn(f"Can't reach BTCPAY_URL {current_app.config['BTCPAY_URL']}: Response status code: {response.status_code}. Capsul will work fine except cryptocurrency payments will not work.")
+      return False
+  except:
+    current_app.logger.warn("unable to create btcpay client. Capsul will work fine except cryptocurrency payments will not work. The error was: " + my_exec_info_message(sys.exc_info()))
+    return False
+
+
 @bp.route("/btcpay/webhook", methods=("POST",))
 def btcpay_webhook():
   

capsulflask/static/style.css

@@ -50,6 +50,19 @@ a:hover, a:active, a:visited {
   border-color: rgb(8, 173, 137);
 }
 
+.error {
+  color: rgb(173, 74, 8);
+  font-weight: bold;
+  border: 1px dashed rgb(173, 74, 8);
+  border-radius: 0.5em;
+  padding: 1em;
+}
+
+.disabled {
+  color: #585a5c;
+}
+
+
 .display-none {
   display: none;
 }

capsulflask/templates/account-balance.html

@@ -47,7 +47,15 @@
             <ul><li>notice: stripe will load nonfree javascript </li></ul>
           </li>
           {% if btcpay_enabled %}
-          <li><a href="/payment/btcpay">Add funds with Bitcoin/Litecoin/Monero (btcpay)</a></li>
+            {% if btcpay_is_working %}
+            <li><a href="/payment/btcpay">Add funds with Bitcoin/Litecoin/Monero (btcpay)</a></li>
+            {% else %}
+            <li>
+              <span class="disabled">Add funds with Bitcoin/Litecoin/Monero (btcpay)</span> 
+              <span class="error"> ERROR: the BTCPay server cannot be reached</span>
+            </li>
+            {% endif %}
+          
           {% endif %}
     
           <li>Cash: email <a href="mailto:treasurer@cyberia.club">treasurer@cyberia.club</a></li>

capsulflask/templates/btcpay.html

@@ -20,11 +20,7 @@
           type="text" 
         />
       </span>
-      <input type="submit" value="Pay with BtcPay"></button>
-    </div>
-    <div class="row">
-      <div>
-      <p>Our BTCPay Server instance is finally back online 🥳</p>
+      <input type="submit" value="Pay with BtcPay"></input>
     </div>
   </form>
 </div>