Class: Prodder::PG

Inherits:
Object
  • Object
show all
Defined in:
lib/prodder/pg.rb

Constant Summary collapse

PGDumpError = 
Class.new(StandardError)
ACL_GRANT =

From pg_dump

/^GRANT /
ACL_REVOKE = 
/^REVOKE /
DEFAULT_PRIVILEGES = 
/^ALTER DEFAULT PRIVILEGES /
SET_OBJECT_OWNERSHIP = 
/.* OWNER TO /

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(credentials = {}) ⇒ PG

Returns a new instance of PG.



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# File 'lib/prodder/pg.rb', line 11

def initialize(credentials = {})
  @credentials = credentials
end

Instance Attribute Details

#credentials ⇒ Object (readonly)

Returns the value of attribute credentials.



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# File 'lib/prodder/pg.rb', line 9

def credentials
  @credentials
end

Instance Method Details

#create_db(db_name, sql = nil) ⇒ Object 



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# File 'lib/prodder/pg.rb', line 32

def create_db(db_name, sql = nil)
  run ['createdb', db_name]
  psql db_name, sql if sql
end

#create_role(role, opts = []) ⇒ Object 



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# File 'lib/prodder/pg.rb', line 15

def create_role(role, opts = [])
  arguments = [
    'createuser',
    '--no-password',
    '--no-superuser',
    '--no-createrole',
    '--no-createdb'
  ]

  arguments.push *opts, role
  run arguments
end

#drop_db(db_name) ⇒ Object 



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# File 'lib/prodder/pg.rb', line 37

def drop_db(db_name)
  run ['dropdb', db_name]
end

#drop_role(role) ⇒ Object 



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# File 'lib/prodder/pg.rb', line 28

def drop_role(role)
  run ['dropuser', role]
end

#dump_db_access_control(db_name, user_list, **options) ⇒ Object 



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# File 'lib/prodder/pg.rb', line 132

def dump_db_access_control(db_name, user_list, **options)
  perm_out_sql = ""
  arguments = [
    '--schema-only',
    '--host', credentials['host'],
    '--username', credentials['user']
  ]

  if options[:exclude_schemas].respond_to? :map
    arguments.concat options[:exclude_schemas].map { |schema| ['--exclude-schema', schema] }.flatten
  end

  if options[:exclude_tables].respond_to? :map
    arguments.concat options[:exclude_tables].map { |table| ['--exclude-table', table] }.flatten
  end

  arguments.push db_name

  white_list = options[:included_users] || []
   = (db_name, white_list).map { |user| user['rolname'] }

  run ['pg_dump', *arguments] do |out, err, success|
    out.each_line do |line|
      if line.match(ACL_GRANT)           ||
         line.match(ACL_REVOKE)          ||
         line.match(DEFAULT_PRIVILEGES)  ||
         line.match(SET_OBJECT_OWNERSHIP)

        unless .include?(line.match(/ (\S*);$/)[1])
          perm_out_sql << line
          user_list << (line.match(/ (\S*);$/)[1]).gsub(/"/, '')
        end
      end
    end
    raise PGDumpError.new(err) if !success
  end

  user_list.uniq!
  perm_out_sql
end

#dump_permissions(db_name, filename, **options) ⇒ Object 



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# File 'lib/prodder/pg.rb', line 108

def dump_permissions(db_name, filename, **options)
  perm_out_sql = ""
  user_list = []

  perm_out_sql << dump_db_access_control(db_name, user_list, **options)
  perm_out_sql.prepend pg_dumpall(db_name, user_list, **options)

  perm_out_sql.prepend(alter_role_function)
  perm_out_sql.prepend(create_role_function)
  perm_out_sql.prepend(granted_by_function)
  perm_out_sql.prepend("SET client_min_messages TO WARNING;\n")
  perm_out_sql << drop_role_create_function
  perm_out_sql << drop_role_alter_function
  perm_out_sql << drop_granted_by_function

  File.open(filename, 'w') { |f| f.write perm_out_sql }
end

#dump_settings(db_name, filename) ⇒ Object 



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# File 'lib/prodder/pg.rb', line 45

def dump_settings(db_name, filename)
  db_settings = pg_conn(db_name) { |conn| conn.exec(<<-SQL).map { |setting| setting['config'] } }
    select unnest(setconfig) as config
    from pg_catalog.pg_db_role_setting
    join pg_database on pg_database.oid = setdatabase
    -- 0 = default, for all users
    where setrole = 0
    and datname = '#{db_name}'
  SQL

  File.open(filename, 'w') do |f|
    db_settings.each do |setting|
      # wipe out all spaces
      setting.gsub!(/\s+/, '')

      # if the setting is empty, ignore it
      unless setting.empty?
        # else, drop carriage returns/new lines
        setting.chomp!
        # and append an empty string if the setting was being assigned a value of nothing
        setting += "''" if setting.match(/=$/)
        # using the magic of psql variables through :DBNAME
        f.puts "ALTER DATABASE :DBNAME SET #{setting};"
      end
    end
  end
end

#dump_structure(db_name, filename, **options) ⇒ Object 



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# File 'lib/prodder/pg.rb', line 73

def dump_structure(db_name, filename, **options)
  arguments = [
    '--schema-only',
    '--no-privileges',
    '--no-owner',
    '--restrict-key', 'prodder',
    '--host', credentials['host'],
    '--username', credentials['user']
  ]

  if options[:exclude_schemas].respond_to? :map
    arguments.concat options[:exclude_schemas].map { |schema| ['--exclude-schema', schema] }.flatten
  end

  if options[:exclude_tables].respond_to? :map
    arguments.concat options[:exclude_tables].map { |table| ['--exclude-table', table] }.flatten
  end

  pg_dump filename, arguments.push(db_name)
end

#dump_tables(db_name, tables, filename) ⇒ Object 



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# File 'lib/prodder/pg.rb', line 94

def dump_tables(db_name, tables, filename)
  pg_dump filename, [
    '--data-only',
    '--no-privileges',
    '--no-owner',
    '--disable-triggers',
    '--restrict-key', 'prodder',
    '--host',     credentials['host'],
    '--username', credentials['user'],
    *tables.map { |table| ['--table', table] }.flatten,
    db_name
  ]
end

#psql(db_name, sql) ⇒ Object 



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# File 'lib/prodder/pg.rb', line 41

def psql(db_name, sql)
  run ['psql', db_name], sql
end