Guard pattern and curve

api/s12_curves.py

@@ -16,7 +16,9 @@ def get_curve_schema(name: str) -> dict[str, dict[str, Any]]:
 
 
 def get_curve(name: str, id: str) -> dict[str, Any]:
-    c_one = read(name, f"select * from _curve where id = '{id}'")
+    c_one = try_read(name, f"select * from _curve where id = '{id}'")
+    if c_one == None:
+        return {}
     cus = read_all(name, f"select * from curves where id = '{id}' order by _order")
     cs = []
     for r in cus:
@@ -66,6 +68,10 @@ def set_curve_cmd(name: str, cs: ChangeSet) -> DbChangeSet:
 
 
 def set_curve(name: str, cs: ChangeSet) -> ChangeSet:
+    if 'id' not in cs.operations[0]:
+        return ChangeSet()
+    if get_curve(name, cs.operations[0]['id']) == {}:
+        return ChangeSet()
     return execute_command(name, set_curve_cmd(name, cs))
 
 
@@ -94,6 +100,10 @@ def add_curve_cmd(name: str, cs: ChangeSet) -> DbChangeSet:
 
 
 def add_curve(name: str, cs: ChangeSet) -> ChangeSet:
+    if 'id' not in cs.operations[0]:
+        return ChangeSet()
+    if get_curve(name, cs.operations[0]['id']) != {}:
+        return ChangeSet()
     return execute_command(name, add_curve_cmd(name, cs))
 
 
@@ -120,6 +130,10 @@ def delete_curve_cmd(name: str, cs: ChangeSet) -> DbChangeSet:
 
 
 def delete_curve(name: str, cs: ChangeSet) -> ChangeSet:
+    if 'id' not in cs.operations[0]:
+        return ChangeSet()
+    if get_curve(name, cs.operations[0]['id']) == {}:
+        return ChangeSet()
     return execute_command(name, delete_curve_cmd(name, cs))