--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/pgtools/pgdiff.py Thu May 26 18:09:05 2011 +0200
@@ -0,0 +1,311 @@
+# -*- coding: utf-8 -*-
+#
+# PgDiff - capture differences of database metadata
+#
+# Depends on PgBrowser
+#
+# Copyright (c) 2011 Radek Brich <radek.brich@devl.cz>
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# 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 OR COPYRIGHT HOLDERS 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.
+
+
+from common.highlight import *
+
+
+class DiffBase:
+ def __init__(self):
+ self.changes = None
+
+ def format(self):
+ out = [' ' * self.level]
+
+ if self.change == '+':
+ out.append(highlight(1, BOLD | GREEN))
+ elif self.change == '-':
+ out.append(highlight(1, BOLD | RED))
+ else:
+ out.append(highlight(1, BOLD | YELLOW))
+ out.append(self.change)
+
+ out += [' ', self.type, ' ', self.name, highlight(0)]
+
+ if self.changes:
+ out += [highlight(1, WHITE), ' (', self.formatchanges(), ')', highlight(0)]
+
+ return ''.join(out)
+
+ def formatnotnull(self, notnull):
+ if notnull:
+ return 'NOT NULL'
+ else:
+ return None
+
+ def formatchanges(self):
+ res = []
+ for x in self.changes:
+ type, a, b = x
+ if type == 'notnull':
+ type = ''
+ a = self.formatnotnull(a)
+ b = self.formatnotnull(b)
+
+ if a and b:
+ s = ''.join(['Changed ', type, ' from ',
+ highlight(1,15), a, highlight(0), ' to ',
+ highlight(1,15), b, highlight(0), '.'])
+ elif a and not b:
+ l = ['Removed ']
+ if type:
+ l += [type, ' ']
+ l += [highlight(1,15), a, highlight(0), '.']
+ s = ''.join(l)
+ elif b and not a:
+ l = ['Added ']
+ if type:
+ l += [type, ' ']
+ l += [highlight(1,15), b, highlight(0), '.']
+ s = ''.join(l)
+ res.append(s)
+ return ' '.join(res)
+
+
+class DiffSchema(DiffBase):
+ def __init__(self, change, schema):
+ DiffBase.__init__(self)
+ self.level = 0
+ self.type = 'schema'
+ self.change = change
+ self.schema = schema
+ self.name = schema
+
+
+class DiffTable(DiffBase):
+ def __init__(self, change, schema, table):
+ DiffBase.__init__(self)
+ self.level = 1
+ self.type = 'table'
+ self.change = change
+ self.schema = schema
+ self.table = table
+ self.name = table
+
+
+class DiffColumn(DiffBase):
+ def __init__(self, change, schema, table, column, changes=None):
+ DiffBase.__init__(self)
+ self.level = 2
+ self.type = 'column'
+ self.change = change
+ self.schema = schema
+ self.table = table
+ self.column = column
+ self.name = column
+ self.changes = changes
+
+
+class DiffConstraint(DiffBase):
+ def __init__(self, change, schema, table, constraint, changes=None):
+ DiffBase.__init__(self)
+ self.level = 2
+ self.type = 'constraint'
+ self.change = change
+ self.schema = schema
+ self.table = table
+ self.constraint = constraint
+ self.name = constraint
+ self.changes = changes
+
+
+class PgDiff:
+ def __init__(self, srcbrowser=None, dstbrowser=None):
+ self.allowcolor = False
+ self.src = srcbrowser
+ self.dst = dstbrowser
+ self.include_schemas = set() # if not empty, consider only these schemas for diff
+ self.exclude_schemas = set() # exclude these schemas from diff
+ self.include_tables = set()
+ self.exclude_tables = set()
+
+ def _test_filter(self, schema):
+ if self.include_schemas and schema not in self.include_schemas:
+ return False
+ if schema in self.exclude_schemas:
+ return False
+ return True
+
+ def _test_table(self, schema, table):
+ name = schema + '.' + table
+ if self.include_tables and name not in self.include_tables:
+ return False
+ if name in self.exclude_tables:
+ return False
+ return True
+
+ def _diffnames(self, src, dst):
+ for x in src:
+ if x in dst:
+ yield ('*', x)
+ else:
+ yield ('-', x)
+ for x in dst:
+ if x not in src:
+ yield ('+', x)
+
+ def _compare_columns(self, a, b):
+ diff = []
+ if a.type != b.type:
+ diff.append(('type', a.type, b.type))
+ if a.notnull != b.notnull:
+ diff.append(('notnull', a.notnull, b.notnull))
+ if a.default != b.default:
+ diff.append(('default', a.default, b.default))
+ return diff
+
+ def _compare_constraints(self, a, b):
+ diff = []
+ if a.type != b.type:
+ diff.append(('type', a.type, b.type))
+ if a.definition != b.definition:
+ diff.append(('definition', a.definition, b.definition))
+ return diff
+
+ def _diff_columns(self, schema, table, src_columns, dst_columns):
+ for nd in self._diffnames(src_columns, dst_columns):
+ cdo = DiffColumn(change=nd[0], schema=schema, table=table, column=nd[1])
+ if nd[0] == '*':
+ a = src_columns[nd[1]]
+ b = dst_columns[nd[1]]
+ cdo.changes = self._compare_columns(a, b)
+ if cdo.changes:
+ yield cdo
+ else:
+ yield cdo
+
+ def _diff_constraints(self, schema, table, src_constraints, dst_constraints):
+ for nd in self._diffnames(src_constraints, dst_constraints):
+ cdo = DiffConstraint(change=nd[0], schema=schema, table=table, constraint=nd[1])
+ if nd[0] == '*':
+ a = src_constraints[nd[1]]
+ b = dst_constraints[nd[1]]
+ cdo.changes = self._compare_constraints(a, b)
+ if cdo.changes:
+ yield cdo
+ else:
+ yield cdo
+
+ def _difftables(self, schema, src_tables, dst_tables):
+ for nd in self._diffnames(src_tables, dst_tables):
+ if not self._test_table(schema, nd[1]):
+ continue
+ tdo = DiffTable(change=nd[0], schema=schema, table=nd[1])
+ if nd[0] == '*':
+ # columns
+ src_columns = src_tables[nd[1]].columns
+ dst_columns = dst_tables[nd[1]].columns
+ for cdo in self._diff_columns(schema, nd[1], src_columns, dst_columns):
+ if tdo:
+ yield tdo
+ tdo = None
+ yield cdo
+ # constraints
+ src_constraints = src_tables[nd[1]].constraints
+ dst_constraints = dst_tables[nd[1]].constraints
+ for cdo in self._diff_constraints(schema, nd[1], src_constraints, dst_constraints):
+ if tdo:
+ yield tdo
+ tdo = None
+ yield cdo
+ else:
+ yield tdo
+
+ def iter_diff(self):
+ '''Return diff between src and dst database schema.
+
+ Yields one line at the time. Each line is in form of object
+ iherited from DiffBase. This object contains all information
+ about changes. See format() method.
+
+ '''
+ src_schemas = self.src.schemas
+ dst_schemas = self.dst.schemas
+ src = [x.name for x in src_schemas.values() if not x.system and self._test_filter(x.name)]
+ dst = [x.name for x in dst_schemas.values() if not x.system and self._test_filter(x.name)]
+ for nd in self._diffnames(src, dst):
+ sdo = DiffSchema(change=nd[0], schema=nd[1])
+ if nd[0] == '*':
+ src_tables = src_schemas[nd[1]].tables
+ dst_tables = dst_schemas[nd[1]].tables
+ for tdo in self._difftables(nd[1], src_tables, dst_tables):
+ if sdo:
+ yield sdo
+ sdo = None
+ yield tdo
+ else:
+ yield sdo
+
+ def print_diff(self):
+ '''Print diff between src and dst database schema.
+
+ The output is in human readable form.
+
+ Set allowcolor=True of PgDiff instance to get colored output.
+
+ '''
+ for ln in self.iter_diff():
+ print(ln.format())
+
+ def print_patch(self):
+ '''Print patch for updating from src schema to dst schema.
+
+ Supports table drop, add, column drop, add and following
+ changes of columns:
+ - type
+ - set/remove not null
+ - default value
+
+ This is experimental, not tested very much.
+ Do not use without checking the commands.
+ Even if it works as intended, it can cause table lock ups
+ and/or loss of data. You have been warned.
+
+ '''
+ for ln in self.iter_diff():
+ print(ln.format_patch())
+
+ def filter_schemas(self, include=[], exclude=[]):
+ '''Modify list of schemas which are used for computing diff.
+
+ include (list) -- if not empty, consider only these schemas for diff
+ exclude (list) -- exclude these schemas from diff
+
+ Order: include, exclude
+ include=[] means include everything
+ '''
+ self.include_schemas.clear()
+ self.include_schemas.update(include)
+ self.exclude_schemas.clear()
+ self.exclude_schemas.update(exclude)
+
+
+ def filter_tables(self, include=[], exclude=[]):
+ self.include_tables.clear()
+ self.include_tables.update(include)
+ self.exclude_tables.clear()
+ self.exclude_tables.update(exclude)
+