|
| 1 | +from typing import Any, List, Optional |
| 2 | + |
| 3 | +from sqlalchemy.ext import compiler |
| 4 | +from sqlalchemy.schema import CreateColumn, DDLElement |
| 5 | + |
| 6 | + |
| 7 | +class CreateExtension(DDLElement): |
| 8 | + def __init__(self, name: str): |
| 9 | + self.name = name |
| 10 | + |
| 11 | + |
| 12 | +@compiler.compiles(CreateExtension) |
| 13 | +def compile_create_extension(element: CreateExtension, _compiler: Any, **__kwargs__) -> str: |
| 14 | + return f"CREATE EXTENSION IF NOT EXISTS {element.name};" |
| 15 | + |
| 16 | + |
| 17 | +class CreateServer(DDLElement): |
| 18 | + def __init__(self, server_name: str, remote_db_name: str, remote_host: str, remote_port: int): |
| 19 | + self.server_name = server_name |
| 20 | + self.remote_db_name = remote_db_name |
| 21 | + self.remote_host = remote_host |
| 22 | + self.remote_port = remote_port |
| 23 | + |
| 24 | + |
| 25 | +@compiler.compiles(CreateServer) |
| 26 | +def compile_create_server(element: CreateServer, _compiler: Any, **__kwargs__) -> str: |
| 27 | + return f""" |
| 28 | + CREATE SERVER IF NOT EXISTS {element.server_name} |
| 29 | + FOREIGN DATA WRAPPER postgres_fdw |
| 30 | + OPTIONS ( |
| 31 | + dbname '{element.remote_db_name}', |
| 32 | + host '{element.remote_host}', |
| 33 | + port '{element.remote_port}' |
| 34 | + ); |
| 35 | + """ |
| 36 | + |
| 37 | + |
| 38 | +class DropServer(DDLElement): |
| 39 | + def __init__(self, server_name: str): |
| 40 | + self.server_name = server_name |
| 41 | + |
| 42 | + |
| 43 | +@compiler.compiles(DropServer) |
| 44 | +def compile_drop_server(element: DropServer, _compiler: Any, **__kwargs__) -> str: |
| 45 | + return f"DROP SERVER IF EXISTS {element.server_name} CASCADE;" |
| 46 | + |
| 47 | + |
| 48 | +class CreateUserMapping(DDLElement): |
| 49 | + def __init__(self, role: str, server_name: str, remote_role: str, remote_password: str): |
| 50 | + self.role = role |
| 51 | + self.server_name = server_name |
| 52 | + self.remote_role = remote_role |
| 53 | + self.remote_password = remote_password |
| 54 | + |
| 55 | + |
| 56 | +@compiler.compiles(CreateUserMapping) |
| 57 | +def compile_create_user_mapping(element: CreateUserMapping, compiler: Any, **kw: Any) -> str: |
| 58 | + return f""" |
| 59 | + CREATE USER MAPPING FOR {element.role} |
| 60 | + SERVER {element.server_name} |
| 61 | + OPTIONS (user '{element.remote_role}', password '{element.remote_password}'); |
| 62 | + """ |
| 63 | + |
| 64 | + |
| 65 | +class DropUserMapping(DDLElement): |
| 66 | + def __init__(self, role: str, server_name: str): |
| 67 | + self.role = role |
| 68 | + self.server_name = server_name |
| 69 | + |
| 70 | + |
| 71 | +@compiler.compiles(DropUserMapping) |
| 72 | +def compile_drop_user_mapping(element: DropUserMapping, compiler: Any, **kw: Any) -> str: |
| 73 | + return f"DROP USER MAPPING IF EXISTS FOR {element.role} SERVER {element.server_name};" |
| 74 | + |
| 75 | + |
| 76 | +class CreateForeignTable(DDLElement): |
| 77 | + def __init__( |
| 78 | + self, |
| 79 | + table_name: str, |
| 80 | + columns: List[Any], |
| 81 | + server_name: str, |
| 82 | + remote_schema_name: str, |
| 83 | + remote_table_name: str, |
| 84 | + local_schema_name: Optional[str] = None, |
| 85 | + ): |
| 86 | + self.local_schema_name = local_schema_name or "public" |
| 87 | + self.table_name = table_name |
| 88 | + self.columns = columns |
| 89 | + self.server_name = server_name |
| 90 | + self.remote_schema_name = remote_schema_name |
| 91 | + self.remote_table_name = remote_table_name |
| 92 | + |
| 93 | + |
| 94 | +@compiler.compiles(CreateForeignTable) |
| 95 | +def compile_create_foreign_table(element: CreateForeignTable, compiler: Any, **kw: Any) -> str: |
| 96 | + columns = [compiler.process(CreateColumn(column), **kw) for column in element.columns] |
| 97 | + return f""" |
| 98 | + CREATE FOREIGN TABLE {element.local_schema_name}.{element.table_name} |
| 99 | + ({", ".join(columns)}) |
| 100 | + SERVER {element.server_name} |
| 101 | + OPTIONS(schema_name '{element.remote_schema_name}', table_name '{element.remote_table_name}'); |
| 102 | + """ |
| 103 | + |
| 104 | + |
| 105 | +class DropForeignTable(DDLElement): |
| 106 | + def __init__(self, name: str): |
| 107 | + self.name = name |
| 108 | + |
| 109 | + |
| 110 | +@compiler.compiles(DropForeignTable) |
| 111 | +def compile_drop_foreign_table(element: DropForeignTable, compiler: Any, **kw: Any) -> str: |
| 112 | + return f"DROP FOREIGN TABLE IF EXISTS {element.name};" |
| 113 | + |
| 114 | + |
| 115 | +class CreatePrefixedIdFunction(DDLElement): |
| 116 | + def __init__(self, function_name: str): |
| 117 | + self.function_name = function_name |
| 118 | + |
| 119 | + |
| 120 | +@compiler.compiles(CreatePrefixedIdFunction) |
| 121 | +def compile_create_prefixed_id_function(element: CreatePrefixedIdFunction, _compiler: Any, **__kwargs__) -> str: |
| 122 | + return f""" |
| 123 | + CREATE OR REPLACE FUNCTION {element.function_name}(prefix TEXT, seq_name TEXT) |
| 124 | + RETURNS TEXT |
| 125 | + AS $$ |
| 126 | + DECLARE |
| 127 | + next_val INTEGER; |
| 128 | + BEGIN |
| 129 | + next_val := nextval(seq_name); |
| 130 | + RETURN prefix || next_val; |
| 131 | + END; |
| 132 | + $$ LANGUAGE plpgsql; |
| 133 | + """ |
| 134 | + |
| 135 | + |
| 136 | +class CreateSuffixedIdFunction(DDLElement): |
| 137 | + def __init__(self, function_name: str): |
| 138 | + self.function_name = function_name |
| 139 | + |
| 140 | + |
| 141 | +@compiler.compiles(CreateSuffixedIdFunction) |
| 142 | +def compile_create_suffixed_id_function(element: CreateSuffixedIdFunction, _compiler: Any, **__kwargs__) -> str: |
| 143 | + return f""" |
| 144 | + CREATE OR REPLACE FUNCTION {element.function_name}(seq_name TEXT, suffix TEXT) |
| 145 | + RETURNS TEXT |
| 146 | + AS $$ |
| 147 | + DECLARE |
| 148 | + next_val INTEGER; |
| 149 | + BEGIN |
| 150 | + next_val := nextval(seq_name); |
| 151 | + RETURN next_val || suffix; |
| 152 | + END; |
| 153 | + $$ LANGUAGE plpgsql; |
| 154 | + """ |
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