PK!333migra/__init__.pyfrom __future__ import unicode_literals from .statements import Statements, UnsafeMigrationException from .changes import Changes from .migra import Migration from .command import do_command __all__ = [ "Migration", "Changes", "Statements", "UnsafeMigrationException", "do_command", ] PK!D}''migra/changes.pyfrom __future__ import unicode_literals from collections import OrderedDict as od from functools import partial from .statements import Statements from .util import differences THINGS = [ "schemas", "enums", "sequences", "constraints", "functions", "views", "indexes", "extensions", "privileges", "collations", "rlspolicies", "triggers", ] PK = "PRIMARY KEY" def statements_for_changes( things_from, things_target, creations_only=False, drops_only=False, modifications=True, dependency_ordering=False, add_dependents_for_modified=False, ): added, removed, modified, unmodified = differences(things_from, things_target) return statements_from_differences( added=added, removed=removed, modified=modified, replaceable=None, creations_only=creations_only, drops_only=drops_only, modifications=modifications, dependency_ordering=dependency_ordering, old=things_from, ) def statements_from_differences( added, removed, modified, replaceable=None, creations_only=False, drops_only=False, modifications=True, dependency_ordering=False, old=None, ): replaceable = replaceable or set() statements = Statements() if not creations_only: pending_drops = set(removed) if modifications: pending_drops |= set(modified) - replaceable else: pending_drops = set() if not drops_only: pending_creations = set(added) if modifications: pending_creations |= set(modified) else: pending_creations = set() def has_remaining_dependents(v, pending_drops): if not dependency_ordering: return False return bool(set(v.dependents) & pending_drops) def has_uncreated_dependencies(v, pending_creations): if not dependency_ordering: return False return bool(set(v.dependent_on) & pending_creations) while True: before = pending_drops | pending_creations if not creations_only: for k, v in removed.items(): if not has_remaining_dependents(v, pending_drops): if k in pending_drops: statements.append(old[k].drop_statement) pending_drops.remove(k) if not drops_only: for k, v in added.items(): if not has_uncreated_dependencies(v, pending_creations): if k in pending_creations: statements.append(v.create_statement) pending_creations.remove(k) if modifications: for k, v in modified.items(): if not creations_only: if not has_remaining_dependents(v, pending_drops): if k in pending_drops: statements.append(old[k].drop_statement) pending_drops.remove(k) if not drops_only: if not has_uncreated_dependencies(v, pending_creations): if k in pending_creations: statements.append(v.create_statement) pending_creations.remove(k) after = pending_drops | pending_creations if not after: break elif ( after == before ): # this should never happen because there shouldn't be circular dependencies raise ValueError("cannot resolve dependencies") # pragma: no cover return statements def get_enum_modifications(tables_from, tables_target, enums_from, enums_target): _, _, e_modified, _ = differences(enums_from, enums_target) _, _, t_modified, _ = differences(tables_from, tables_target) pre = Statements() recreate = Statements() post = Statements() enums_to_change = e_modified for t, v in t_modified.items(): t_before = tables_from[t] _, _, c_modified, _ = differences(t_before.columns, v.columns) for k, c in c_modified.items(): before = t_before.columns[k] if ( c.is_enum == before.is_enum and c.dbtypestr == before.dbtypestr and c.enum != before.enum ): pre.append(before.change_enum_to_string_statement(t)) post.append(before.change_string_to_enum_statement(t)) for e in enums_to_change.values(): recreate.append(e.drop_statement) recreate.append(e.create_statement) return pre + recreate + post def get_table_changes(tables_from, tables_target, enums_from, enums_target): added, removed, modified, _ = differences(tables_from, tables_target) statements = Statements() for t, v in removed.items(): statements.append(v.drop_statement) for t, v in added.items(): statements.append(v.create_statement) statements += get_enum_modifications( tables_from, tables_target, enums_from, enums_target ) for t, v in modified.items(): before = tables_from[t] # drop/recreate tables which have changed from partitioned to non-partitioned if v.is_partitioned != before.is_partitioned: statements.append(v.drop_statement) statements.append(v.create_statement) continue # attach/detach tables with changed parent tables if v.parent_table != before.parent_table: statements += v.attach_detach_statements(before) for t, v in modified.items(): before = tables_from[t] if not v.is_alterable: continue c_added, c_removed, c_modified, _ = differences(before.columns, v.columns) for k, c in c_removed.items(): alter = v.alter_table_statement(c.drop_column_clause) statements.append(alter) for k, c in c_added.items(): alter = v.alter_table_statement(c.add_column_clause) statements.append(alter) for k, c in c_modified.items(): statements += c.alter_table_statements(before.columns[k], t) if v.rowsecurity != before.rowsecurity: rls_alter = v.alter_rls_statement statements += [rls_alter] return statements def get_selectable_changes( selectables_from, selectables_target, enums_from, enums_target, add_dependents_for_modified=True, ): tables_from = od((k, v) for k, v in selectables_from.items() if v.is_table) tables_target = od((k, v) for k, v in selectables_target.items() if v.is_table) other_from = od((k, v) for k, v in selectables_from.items() if not v.is_table) other_target = od((k, v) for k, v in selectables_target.items() if not v.is_table) added_tables, removed_tables, modified_tables, unmodified_tables = differences( tables_from, tables_target ) added_other, removed_other, modified_other, unmodified_other = differences( other_from, other_target ) changed_all = {} changed_all.update(modified_tables) changed_all.update(modified_other) modified_all = dict(changed_all) changed_all.update(removed_tables) changed_all.update(removed_other) replaceable = set() not_replaceable = set() if add_dependents_for_modified: for k, m in changed_all.items(): old = selectables_from[k] if k in modified_all and m.can_replace(old): if not m.is_table: replaceable.add(k) continue for d in m.dependents_all: if d in unmodified_other: dd = unmodified_other.pop(d) modified_other[d] = dd not_replaceable.add(d) modified_other = od(sorted(modified_other.items())) replaceable -= not_replaceable statements = Statements() def functions(d): return {k: v for k, v in d.items() if v.relationtype == "f"} statements += statements_from_differences( added_other, removed_other, modified_other, replaceable=replaceable, drops_only=True, dependency_ordering=True, old=selectables_from, ) statements += get_table_changes( tables_from, tables_target, enums_from, enums_target ) if any([functions(added_other), functions(modified_other)]): statements += ["set check_function_bodies = off;"] statements += statements_from_differences( added_other, removed_other, modified_other, replaceable=replaceable, creations_only=True, dependency_ordering=True, old=selectables_from, ) return statements class Changes(object): def __init__(self, i_from, i_target): self.i_from = i_from self.i_target = i_target def __getattr__(self, name): if name == "non_pk_constraints": a = self.i_from.constraints.items() b = self.i_target.constraints.items() a_od = od((k, v) for k, v in a if v.constraint_type != PK) b_od = od((k, v) for k, v in b if v.constraint_type != PK) return partial(statements_for_changes, a_od, b_od) elif name == "pk_constraints": a = self.i_from.constraints.items() b = self.i_target.constraints.items() a_od = od((k, v) for k, v in a if v.constraint_type == PK) b_od = od((k, v) for k, v in b if v.constraint_type == PK) return partial(statements_for_changes, a_od, b_od) elif name == "selectables": return partial( get_selectable_changes, od(sorted(self.i_from.selectables.items())), od(sorted(self.i_target.selectables.items())), self.i_from.enums, self.i_target.enums, ) elif name in THINGS: return partial( statements_for_changes, getattr(self.i_from, name), getattr(self.i_target, name), ) else: raise AttributeError(name) PK!zIP! ! migra/command.pyfrom __future__ import print_function, unicode_literals import argparse import sys from contextlib import contextmanager from sqlbag import S from .migra import Migration from .statements import UnsafeMigrationException @contextmanager def arg_context(x): if x == "EMPTY": yield None else: with S(x) as s: yield s def parse_args(args): parser = argparse.ArgumentParser(description="Generate a database migration.") parser.add_argument( "--unsafe", dest="unsafe", action="store_true", help="Prevent migra from erroring upon generation of drop statements.", ) parser.add_argument( "--schema", dest="schema", default=None, help="Restrict output to statements for a particular schema", ) parser.add_argument( "--create-extensions-only", dest="create_extensions_only", action="store_true", default=False, help='Only output "create extension..." statements, nothing else.', ) parser.add_argument( "--with-privileges", dest="with_privileges", action="store_true", default=False, help="Also output privilege differences (ie. grant/revoke statements)", ) parser.add_argument( "--force-utf8", dest="force_utf8", action="store_true", default=False, help="Force UTF-8 encoding for output", ) parser.add_argument("dburl_from", help="The database you want to migrate.") parser.add_argument( "dburl_target", help="The database you want to use as the target." ) return parser.parse_args(args) def run(args, out=None, err=None): schema = args.schema if not out: out = sys.stdout # pragma: no cover if not err: err = sys.stderr # pragma: no cover with arg_context(args.dburl_from) as ac0, arg_context(args.dburl_target) as ac1: m = Migration(ac0, ac1, schema=schema) if args.unsafe: m.set_safety(False) if args.create_extensions_only: m.add_extension_changes(drops=False) else: m.add_all_changes(privileges=args.with_privileges) try: if m.statements: if args.force_utf8: print(m.sql.encode("utf8"), file=out) else: print(m.sql, file=out) except UnsafeMigrationException: print( "-- ERROR: destructive statements generated. Use the --unsafe flag to suppress this error.", file=err, ) return 3 if not m.statements: return 0 else: return 2 def do_command(): # pragma: no cover args = parse_args(sys.argv[1:]) status = run(args) sys.exit(status) PK!e migra/migra.pyfrom __future__ import unicode_literals from schemainspect import DBInspector, get_inspector from sqlbag import raw_execute from .changes import Changes from .statements import Statements class Migration(object): """ The main class of migra """ def __init__(self, x_from, x_target, schema=None): self.statements = Statements() self.changes = Changes(None, None) self.schema = schema if isinstance(x_from, DBInspector): self.changes.i_from = x_from else: self.changes.i_from = get_inspector(x_from, schema=schema) if x_from: self.s_from = x_from if isinstance(x_target, DBInspector): self.changes.i_target = x_target else: self.changes.i_target = get_inspector(x_target, schema=schema) if x_target: self.s_target = x_target def inspect_from(self): self.changes.i_from = get_inspector(self.s_from, schema=self.schema) def inspect_target(self): self.changes.i_target = get_inspector(self.s_target, schema=self.schema) def clear(self): self.statements = Statements() def apply(self): for stmt in self.statements: raw_execute(self.s_from, stmt) self.changes.i_from = get_inspector(self.s_from, schema=self.schema) safety_on = self.statements.safe self.clear() self.set_safety(safety_on) def add(self, statements): self.statements += statements def add_sql(self, sql): self.statements += Statements([sql]) def set_safety(self, safety_on): self.statements.safe = safety_on def add_extension_changes(self, creates=True, drops=True): if creates: self.add(self.changes.extensions(creations_only=True)) if drops: self.add(self.changes.extensions(drops_only=True)) def add_all_changes(self, privileges=False): self.add(self.changes.schemas(creations_only=True)) self.add(self.changes.extensions(creations_only=True)) self.add(self.changes.collations(creations_only=True)) self.add(self.changes.enums(creations_only=True, modifications=False)) self.add(self.changes.sequences(creations_only=True)) self.add(self.changes.triggers(drops_only=True)) self.add(self.changes.rlspolicies(drops_only=True)) if privileges: self.add(self.changes.privileges(drops_only=True)) self.add(self.changes.non_pk_constraints(drops_only=True)) self.add(self.changes.pk_constraints(drops_only=True)) self.add(self.changes.indexes(drops_only=True)) self.add(self.changes.selectables()) self.add(self.changes.sequences(drops_only=True)) self.add(self.changes.enums(drops_only=True, modifications=False)) self.add(self.changes.extensions(drops_only=True)) self.add(self.changes.indexes(creations_only=True)) self.add(self.changes.pk_constraints(creations_only=True)) self.add(self.changes.non_pk_constraints(creations_only=True)) if privileges: self.add(self.changes.privileges(creations_only=True)) self.add(self.changes.rlspolicies(creations_only=True)) self.add(self.changes.triggers(creations_only=True)) self.add(self.changes.collations(drops_only=True)) self.add(self.changes.schemas(drops_only=True)) @property def sql(self): return self.statements.sql PK!}<<migra/statements.pyfrom __future__ import unicode_literals import re def check_for_drop(s): return bool(re.search(r"(drop\s+)", s, re.IGNORECASE)) class Statements(list): def __init__(self, *args, **kwargs): self.safe = True super(Statements, self).__init__(*args, **kwargs) @property def sql(self): if self.safe: self.raise_if_unsafe() if not self: return "" return "\n\n".join(self) + "\n\n" def raise_if_unsafe(self): if any(check_for_drop(s) for s in self): raise UnsafeMigrationException( "unsafe/destructive change being autogenerated, refusing to carry on further" ) def __add__(self, other): self += list(other) return self class UnsafeMigrationException(Exception): pass PK!I migra/util.pyfrom __future__ import unicode_literals from collections import OrderedDict as od def differences(a, b, add_dependencies_for_modifications=True): a_keys = set(a.keys()) b_keys = set(b.keys()) keys_added = set(b_keys) - set(a_keys) keys_removed = set(a_keys) - set(b_keys) keys_common = set(a_keys) & set(b_keys) added = od((k, b[k]) for k in sorted(keys_added)) removed = od((k, a[k]) for k in sorted(keys_removed)) modified = od((k, b[k]) for k in sorted(keys_common) if a[k] != b[k]) unmodified = od((k, b[k]) for k in sorted(keys_common) if a[k] == b[k]) return added, removed, modified, unmodified PK!Ht*Q(*/migra-1.0.1551586344.dist-info/entry_points.txtN+I/N.,()L/JV)y)\\PK!a&migra-1.0.1551586344.dist-info/LICENSEThis is free and unencumbered software released into the public domain. Anyone is free to copy, modify, publish, use, compile, sell, or distribute this software, either in source code form or as a compiled binary, for any purpose, commercial or non-commercial, and by any means. In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain. We make this dedication for the benefit of the public at large and to the detriment of our heirs and successors. We intend this dedication to be an overt act of relinquishment in perpetuity of all present and future rights to this software under copyright law. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 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