Add option to disable invoice creation for lagging or unsynced crypto nodes

Implemented settings to automatically disable the generation of invoices and display these cryptocurrencies as available for creating an invoice for cryptocurrencies that are not fully synchronized or have a lag.

Author: yukonet

shkeeper/__init__.py

@@ -68,6 +68,7 @@ def create_app(test_config=None):
         DEV_MODE_ENC_PW=os.environ.get("DEV_MODE_ENC_PW"),
         NOTIFICATION_TASK_DELAY=int(os.environ.get("NOTIFICATION_TASK_DELAY", 60)),
         TEMPLATES_AUTO_RELOAD=True,
+        DISABLE_CRYPTO_WHEN_LAGS=bool(os.environ.get("DISABLE_CRYPTO_WHEN_LAGS", False)),
     )
 
     if test_config is None:

shkeeper/api_v1.py

@@ -46,10 +46,12 @@ def list_crypto():
     crypto_list = []
     for crypto in Crypto.instances.values():
         if crypto.wallet.enabled and (crypto.getstatus() != "Offline"):
-            filtered_list.append(crypto.crypto)
-            crypto_list.append(
-                {"name": crypto.crypto, "display_name": crypto.display_name}
-            )
+            if (not app.config.get("DISABLE_CRYPTO_WHEN_LAGS") or 
+                    (app.config.get("DISABLE_CRYPTO_WHEN_LAGS") and crypto.getstatus() == "Synced")):
+                filtered_list.append(crypto.crypto)
+                crypto_list.append(
+                    {"name": crypto.crypto, "display_name": crypto.display_name}
+                )
     return {
         "status": "success",
         "crypto": filtered_list,
@@ -81,6 +83,11 @@ def payment_request(crypto_name):
                 "status": "error",
                 "message": f"{crypto_name} payment gateway is unavailable",
             }
+        if app.config.get("DISABLE_CRYPTO_WHEN_LAGS") and crypto.getstatus() != "Synced":
+            return {
+                "status": "error",
+                "message": f"{crypto_name} payment gateway is unavailable because of lagging",
+            }
 
         req = request.get_json(force=True)
         invoice = Invoice.add(crypto=crypto, request=req)
@@ -116,6 +123,11 @@ def get_crypto_quote(crypto_name):
                 "status": "error",
                 "message": f"{crypto_name} payment gateway is unavailable",
             }
+        if app.config.get("DISABLE_CRYPTO_WHEN_LAGS") and crypto.getstatus() != "Synced":
+            return {
+                "status": "error",
+                "message": f"{crypto_name} payment gateway is unavailable because of lagging",
+            }
 
         req = request.get_json(force=True)
         fiat = req.get("fiat")