Add schema support

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = ProcruSQL
-version = 0.0.14
+version = 0.0.15
 author = Peter J. Holzer
 author_email = hjp@hjp.at
 description = Make a database fit its description

src/procrusql/__init__.py

@@ -48,11 +48,12 @@ class Node:
         self.order = order
 
 class HaveData(Node):
-    def __init__(self, name, depends, table, key, extra):
+    def __init__(self, name, depends, table, key, extra, schema="public"):
         super().__init__(name, depends)
         self.table = table
         self.key = key
         self.extra = extra
+        self.schema = schema
 
     def check(self):
         log_check.info("Checking %s", self.name)
@@ -63,8 +64,9 @@ class HaveData(Node):
         ]
         key_check = sql.SQL(" and ").join(key_checks)
         q = sql.SQL(
-                "select * from {table} where {key_check}"
+                "select * from {schema}.{table} where {key_check}"
             ).format(
+                schema=sql.Identifier(self.schema),
                 table=sql.Identifier(self.table),
                 key_check=key_check
             )
@@ -78,8 +80,9 @@ class HaveData(Node):
                 if self.result[0][c] != self.extra[c]:
                     log_action.info("Updating %s: %s <- %s", key_values, c, self.extra[c])
                     q = sql.SQL(
-                        "update {table} set {column}={placeholder} where {key_check}"
+                        "update {schema}.{table} set {column}={placeholder} where {key_check}"
                     ).format(
+                        schema=sql.Identifier(self.schema),
                         table=sql.Identifier(self.table),
                         column=sql.Identifier(c),
                         placeholder=sql.Placeholder(),
@@ -96,8 +99,9 @@ class HaveData(Node):
             columns = list(self.key.keys()) + list(self.extra.keys())
             values = key_values + extra_values
             q = sql.SQL(
-                    "insert into {table}({columns}) values({placeholders}) returning *"
+                    "insert into {schema}.{table}({columns}) values({placeholders}) returning *"
                 ).format(
+                    schema=sql.Identifier(self.schema),
                     table=sql.Identifier(self.table),
                     columns=sql.SQL(", ").join([sql.Identifier(x) for x in columns]),
                     placeholders=sql.SQL(", ").join([sql.Placeholder() for x in columns]),
@@ -150,7 +154,7 @@ class HaveTable(Node):
     def __init__(self, name, depends, table, schema="public"):
         super().__init__(name, depends)
         self.table = table
-        self.schema = "public"
+        self.schema = schema
 
     def check(self):
         log_check.info("Checking %s", self.name)
@@ -198,7 +202,7 @@ class HaveColumn(Node):
         self.table = table
         self.column = column
         self.definition = definition
-        self.schema = "public"
+        self.schema = schema
 
     def check(self):
         log_check.info("Checking %s", self.name)
@@ -352,16 +356,22 @@ def main():
     ap = argparse.ArgumentParser()
     ap.add_argument("--dbname")
     ap.add_argument("--dbuser")
+    ap.add_argument("--schema", default="public")
     ap.add_argument("files", nargs="+")
     args = ap.parse_args()
 
     db = psycopg2.connect(dbname=args.dbname, user=args.dbuser)
+    csr = db.cursor()
+    csr.execute("show search_path")
+    search_path = csr.fetchone()[0]
+    search_path = args.schema + ", " + search_path
+    csr.execute(f"set search_path to {search_path}")
 
     rules = []
     for f in args.files:
         with open(f) as rf:
             text = rf.read()
-        ps = parser.ParseState(text)
+        ps = parser.ParseState(text, schema=args.schema)
 
         ps2 = parser.parse_ruleset(ps)
 

src/procrusql/parser.py

@@ -21,13 +21,14 @@ class Failure:
 
 class ParseState:
 
-    def __init__(self, text, position=0):
+    def __init__(self, text, position=0, schema="public"):
         self.text = text
         self.position = position
+        self.schema = schema # the default schema. probably doesn't belong into the parser state
         self.child_failure = None
 
     def clone(self):
-        ps = ParseState(self.text, self.position)
+        ps = ParseState(self.text, self.position, self.schema)
         return ps
 
     @property
@@ -98,8 +99,16 @@ def parse_table_rule(ps):
     if not ps3:
         ps.record_child_failure(ps2, "expected table name")
         return
+    if len(ps3.ast) == 2:
+        schema_name = ps3.ast[0]
+        table_name = ps3.ast[1]
+    elif len(ps3.ast) == 1:
+        schema_name = ps3.schema
+        table_name = ps3.ast[0]
+    else:
+        assert(False)
 
-    ps2.ast = procrusql.HaveTable(rulename(), [], ps3.ast[0])
+    ps2.ast = procrusql.HaveTable(rulename(), [], ps3.ast[0], schema=schema_name)
     ps2.position = ps3.position
     return ps2
 
@@ -119,7 +128,14 @@ def parse_column_rule(ps):
     if not ps3:
         ps.record_child_failure(ps2, "expected table name")
         return
-    table_name = ps3.ast[0]
+    if len(ps3.ast) == 2:
+        schema_name = ps3.ast[0]
+        table_name = ps3.ast[1]
+    elif len(ps3.ast) == 1:
+        schema_name = ps3.schema
+        table_name = ps3.ast[0]
+    else:
+        assert(False)
     ps2.position = ps3.position
 
     ps3 = parse_column_name(ps2)
@@ -136,7 +152,9 @@ def parse_column_rule(ps):
     column_definition = ps3.ast[0]
     ps2.position = ps3.position
 
-    ps2.ast = procrusql.HaveColumn(rulename(), [], table_name, column_name, column_definition)
+    ps2.ast = procrusql.HaveColumn(
+                            rulename(), [],
+                            table_name, column_name, column_definition, schema=schema_name)
 
     ps2.match_newlines()
 
@@ -153,7 +171,14 @@ def parse_data_rule(ps):
     if not ps3:
         ps.record_child_failure(ps2, "expected table name")
         return
-    table_name = ps3.ast[0]
+    if len(ps3.ast) == 2:
+        schema_name = ps3.ast[0]
+        table_name = ps3.ast[1]
+    elif len(ps3.ast) == 1:
+        schema_name = ps3.schema
+        table_name = ps3.ast[0]
+    else:
+        assert(False)
     ps2.position = ps3.position
 
     if ps3 := parse_dict(ps2):
@@ -174,7 +199,9 @@ def parse_data_rule(ps):
         else:
             label = rulename()
 
-        ps2.ast = procrusql.HaveData(label, [], table_name, key_data, extra_data)
+        ps2.ast = procrusql.HaveData(
+                                label, [],
+                                table_name, key_data, extra_data, schema=schema_name)
 
         ps2.match_newlines()
     elif ps3 := parse_init_query(ps2):
@@ -215,7 +242,14 @@ def parse_index_rule(ps):
     if not ps3:
         ps.record_child_failure(ps2, "expected table name")
         return
-    table_name = ps3.ast[0]
+    if len(ps3.ast) == 2:
+        schema_name = ps3.ast[0]
+        table_name = ps3.ast[1]
+    elif len(ps3.ast) == 1:
+        schema_name = ps3.schema
+        table_name = ps3.ast[0]
+    else:
+        assert(False)
     ps2.position = ps3.position
 
     m = ps2.match(r"\s*(using\b|\([\w, ]+\))[^>\n]*")
@@ -230,7 +264,10 @@ def parse_index_rule(ps):
     else:
         label = rulename()
 
-    ps2.ast = procrusql.HaveIndex(label, [], table_name, index_name, index_type, index_definition)
+    ps2.ast = procrusql.HaveIndex(
+                            label, [],
+                            table_name, index_name,
+                            index_type, index_definition, schema=schema_name)
 
     ps2.match_newlines()
 
@@ -247,6 +284,12 @@ def parse_table_name(ps):
     if ps2.rest[0].isalpha():
         m = ps2.match(r"\w+") # always succeeds since we already checked the first character
         ps2.ast.append(m.group(0))
+        if ps2.rest[0] == ".":
+            m = ps2.match(r"\w+")
+            if not m:
+                ps.record_child_failure(ps2, "expected table name after schema")
+                return
+            ps2.ast.append(m.group(0))
     else:
         ps.record_child_failure(ps2, "expected table name")
     return ps2