285 lines
11 KiB
Python
285 lines
11 KiB
Python
from psycopg import Connection, sql
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from .connection import project_connection, project_transaction
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from .database import acquire_model_mutation_lock
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_MODEL_SCHEMAS = ("network", "gis")
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_ALLOWED_EXTERNAL_REFERENCES = {
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("analysis", "results", "network", "nodes"),
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("analysis", "results", "network", "links"),
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("asset", "scada_devices", "network", "nodes"),
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("asset", "scada_devices", "network", "links"),
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}
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def _model_tables(conn: Connection) -> list[tuple[str, str]]:
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with conn.cursor() as cur:
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cur.execute(
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"""
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select n.nspname as schema_name, c.relname as table_name
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from pg_class c
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join pg_namespace n on n.oid = c.relnamespace
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where n.nspname = any(%s) and c.relkind in ('r', 'p')
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order by n.nspname, c.relname
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""",
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(list(_MODEL_SCHEMAS),),
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)
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return [(row["schema_name"], row["table_name"]) for row in cur.fetchall()]
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def _copy_order(
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conn: Connection, tables: list[tuple[str, str]]
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) -> list[tuple[str, str]]:
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table_set = set(tables)
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dependencies: dict[tuple[str, str], set[tuple[str, str]]] = {
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table: set() for table in tables
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}
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with conn.cursor() as cur:
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cur.execute(
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"""
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select source_ns.nspname as source_schema,
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source.relname as source_table,
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target_ns.nspname as target_schema,
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target.relname as target_table
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from pg_constraint constraint_row
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join pg_class source on source.oid = constraint_row.conrelid
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join pg_namespace source_ns on source_ns.oid = source.relnamespace
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join pg_class target on target.oid = constraint_row.confrelid
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join pg_namespace target_ns on target_ns.oid = target.relnamespace
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where constraint_row.contype = 'f'
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and source_ns.nspname = any(%s)
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and target_ns.nspname = any(%s)
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""",
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(list(_MODEL_SCHEMAS), list(_MODEL_SCHEMAS)),
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)
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for row in cur.fetchall():
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source = (row["source_schema"], row["source_table"])
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target = (row["target_schema"], row["target_table"])
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if source in table_set and target in table_set and source != target:
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dependencies[source].add(target)
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ordered: list[tuple[str, str]] = []
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remaining = set(tables)
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while remaining:
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ready = sorted(
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table for table in remaining if not (dependencies[table] & remaining)
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)
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if not ready:
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cycle = ", ".join(f"{schema}.{table}" for schema, table in sorted(remaining))
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raise RuntimeError(f"Model table foreign-key cycle detected: {cycle}")
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ordered.extend(ready)
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remaining.difference_update(ready)
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return ordered
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def _table_columns(
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conn: Connection, schema_name: str, table_name: str
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) -> list[str]:
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with conn.cursor() as cur:
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cur.execute(
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"""
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select column_name
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from information_schema.columns
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where table_schema = %s and table_name = %s
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and is_generated = 'NEVER'
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order by ordinal_position
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""",
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(schema_name, table_name),
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)
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return [row["column_name"] for row in cur.fetchall()]
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def _external_references(conn: Connection) -> set[tuple[str, str, str, str]]:
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with conn.cursor() as cur:
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cur.execute(
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"""
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select source_ns.nspname as source_schema,
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source.relname as source_table,
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target_ns.nspname as target_schema,
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target.relname as target_table
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from pg_constraint constraint_row
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join pg_class source on source.oid = constraint_row.conrelid
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join pg_namespace source_ns on source_ns.oid = source.relnamespace
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join pg_class target on target.oid = constraint_row.confrelid
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join pg_namespace target_ns on target_ns.oid = target.relnamespace
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where constraint_row.contype = 'f'
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and target_ns.nspname = any(%s)
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and source_ns.nspname <> all(%s)
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""",
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(list(_MODEL_SCHEMAS), list(_MODEL_SCHEMAS)),
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)
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return {
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(
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row["source_schema"],
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row["source_table"],
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row["target_schema"],
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row["target_table"],
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)
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for row in cur.fetchall()
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}
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def _copy_table(
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source_conn: Connection,
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target_conn: Connection,
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schema_name: str,
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table_name: str,
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columns: list[str],
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) -> None:
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relation = sql.Identifier(schema_name, table_name)
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column_list = sql.SQL(", ").join(map(sql.Identifier, columns))
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copy_out = sql.SQL("copy {} ({}) to stdout").format(relation, column_list)
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copy_in = sql.SQL("copy {} ({}) from stdin").format(relation, column_list)
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with source_conn.cursor().copy(copy_out) as source_copy:
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with target_conn.cursor().copy(copy_in) as target_copy:
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for chunk in source_copy:
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target_copy.write(chunk)
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def replace_project_model(
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target_project: str,
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source_project: str,
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*,
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copy_source_scada: bool = False,
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) -> None:
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"""Atomically replace WNDB/GIS model tables from a validated staging DB.
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Business and analysis tables remain in the target database. Historical
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analysis rows keep references that still exist and become element-neutral
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when an element disappeared. SCADA devices are retained only when their
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bound node or link still exists in the replacement model.
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``copy_source_scada`` is used only for temporary project clones. Normal INP
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replacement keeps the target project's existing device mappings and drops
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mappings whose model element no longer exists.
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"""
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with project_connection(source_project) as source_conn, source_conn.transaction():
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with source_conn.cursor() as cur:
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cur.execute("set transaction isolation level repeatable read, read only")
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source_tables = _model_tables(source_conn)
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source_columns = {
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table: _table_columns(source_conn, *table) for table in source_tables
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}
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source_scada_columns = (
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_table_columns(source_conn, "asset", "scada_devices")
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if copy_source_scada
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else []
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)
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copy_order = _copy_order(source_conn, source_tables)
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with project_transaction(target_project) as target_conn:
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acquire_model_mutation_lock(target_conn, target_project)
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target_tables = _model_tables(target_conn)
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if set(target_tables) != set(source_tables):
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missing = sorted(set(source_tables) - set(target_tables))
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extra = sorted(set(target_tables) - set(source_tables))
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raise RuntimeError(
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f"Staging/target model schema mismatch; missing={missing}, extra={extra}"
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)
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for table, columns in source_columns.items():
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if _table_columns(target_conn, *table) != columns:
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raise RuntimeError(
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f"Staging/target columns differ for {table[0]}.{table[1]}"
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)
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if copy_source_scada and _table_columns(
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target_conn, "asset", "scada_devices"
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) != source_scada_columns:
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raise RuntimeError(
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"Source/target columns differ for asset.scada_devices"
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)
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unexpected = _external_references(target_conn) - _ALLOWED_EXTERNAL_REFERENCES
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if unexpected:
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formatted = ", ".join(
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f"{source_schema}.{source_table}->{target_schema}.{target_table}"
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for source_schema, source_table, target_schema, target_table in sorted(
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unexpected
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)
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)
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raise RuntimeError(
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f"Model replacement has unsupported external references: {formatted}"
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)
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with target_conn.cursor() as cur:
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if not copy_source_scada:
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cur.execute(
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"create temporary table model_scada_snapshot on commit drop "
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"as table asset.scada_devices"
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)
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cur.execute("delete from asset.scada_devices")
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cur.execute(
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"create temporary table model_result_refs on commit drop as "
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"select result_id, node_id, link_id from analysis.results"
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)
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cur.execute("update analysis.results set node_id = null, link_id = null")
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for schema_name, table_name in reversed(copy_order):
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cur.execute(
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sql.SQL("delete from {}").format(
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sql.Identifier(schema_name, table_name)
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)
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)
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for schema_name, table_name in copy_order:
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_copy_table(
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source_conn,
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target_conn,
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schema_name,
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table_name,
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source_columns[(schema_name, table_name)],
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)
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if copy_source_scada:
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_copy_table(
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source_conn,
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target_conn,
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"asset",
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"scada_devices",
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source_scada_columns,
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)
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with target_conn.cursor() as cur:
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if not copy_source_scada:
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cur.execute(
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"""
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insert into asset.scada_devices
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select snapshot.*
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from model_scada_snapshot snapshot
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where (
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snapshot.node_id is not null
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and exists (
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select 1 from network.nodes node
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where node.id = snapshot.node_id
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)
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) or (
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snapshot.link_id is not null
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and exists (
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select 1 from network.links link
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where link.id = snapshot.link_id
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)
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)
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"""
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)
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cur.execute(
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"""
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update analysis.results result
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set node_id = case
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when exists (
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select 1 from network.nodes node
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where node.id = refs.node_id
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) then refs.node_id
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else null
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end,
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link_id = case
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when exists (
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select 1 from network.links link
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where link.id = refs.link_id
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) then refs.link_id
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else null
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end
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from model_result_refs refs
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where refs.result_id = result.result_id
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"""
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)
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