Support cascade deletion

api/s3_reservoirs.py

@@ -1,4 +1,4 @@
-from .operation import *
+from .database import *
 from .s0_base import *
 from .s24_coordinates import *
 
@@ -47,7 +47,7 @@ class Reservoir(object):
         return { 'type': self.type, 'id': self.id }
 
 
-def set_reservoir_cache(name: str, cs: ChangeSet) -> DbChangeSet:
+def set_reservoir_cmd(name: str, cs: ChangeSet) -> DbChangeSet:
     old = Reservoir(get_reservoir(name, cs.operations[0]['id']))
     raw_new = get_reservoir(name, cs.operations[0]['id'])
 
@@ -71,10 +71,10 @@ def set_reservoir_cache(name: str, cs: ChangeSet) -> DbChangeSet:
 
 
 def set_reservoir(name: str, cs: ChangeSet) -> ChangeSet:
-    return execute_command(name, set_reservoir_cache(name, cs))
+    return execute_command(name, set_reservoir_cmd(name, cs))
 
 
-def add_reservoir_cache(name: str, cs: ChangeSet) -> DbChangeSet:
+def add_reservoir_cmd(name: str, cs: ChangeSet) -> DbChangeSet:
     new = Reservoir(cs.operations[0])
 
     redo_sql = f"insert into _node (id, type) values ({new.f_id}, {new.f_type});"
@@ -92,10 +92,10 @@ def add_reservoir_cache(name: str, cs: ChangeSet) -> DbChangeSet:
 
 
 def add_reservoir(name: str, cs: ChangeSet) -> ChangeSet:
-    return execute_command(name, add_reservoir_cache(name, cs))
+    return execute_command(name, add_reservoir_cmd(name, cs))
 
 
-def delete_reservoir_cache(name: str, cs: ChangeSet) -> DbChangeSet:
+def delete_reservoir_cmd(name: str, cs: ChangeSet) -> DbChangeSet:
     old = Reservoir(get_reservoir(name, cs.operations[0]['id']))
 
     redo_sql = f"delete from coordinates where node = {old.f_id};"
@@ -113,7 +113,7 @@ def delete_reservoir_cache(name: str, cs: ChangeSet) -> DbChangeSet:
 
 
 def delete_reservoir(name: str, cs: ChangeSet) -> ChangeSet:
-    return execute_command(name, delete_reservoir_cache(name, cs))
+    return execute_command(name, delete_reservoir_cmd(name, cs))
 
 
 class InpReservoir:
@@ -151,3 +151,13 @@ def inp_out_reservoir(name: str) -> list[str]:
         desc = ';'
         lines.append(f'{id} {head} {pattern} {desc}')
     return lines
+
+
+def unset_reservoir_by_pattern(name: str, pattern: str) -> ChangeSet:
+    cs = ChangeSet()
+
+    rows = read_all(name, f"select id from reservoirs where pattern = '{pattern}'")
+    for row in rows:
+        cs.append(g_update_prefix | {'type': 'reservoir', 'id': row['id'], 'pattern': None})
+
+    return cs