Source

dumbo / dumbo

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#!/usr/bin/env python
'''
    Dumbo, a pgadmin-style database viewer for the console.
    (c) 2011, Mike Miller, ...
    Released under the GPL, v2.
        http://www.gnu.org/licenses/gpl-2.0.html

    Usage:
        %prog [options] [inifile]
'''
if True:  # foldable init
    import sys, os, logging
    from optparse import OptionParser
    from  ConfigParser import RawConfigParser as rcp
    import urwid as u
    from utk import *

    appname     = 'dumbo'
    __version__ = '0.61a'
    title       = ' %s %s ' % (appname.title(), __version__)
    inipath     = ('dumbo.ini', '~/.config/dumbo.ini', '/etc/dumbo.ini')
    debug       = False

    # build up some defaults in case .ini file not found.
    defdb = dict(type='postgres')
    defconfig = dict(dumbo=dict(theme='dark', db=defdb, use256=True))
    defpalette = [
        # name          fg       bg       mono fg256   bg256
        ('header',      'white', 'black', '', 'g90', 'g20'),
        ('left',        '', '', '', 'g70', 'g10'),
        ('right',       '', '', '', 'g80', ''),
        ('footer',      'light gray', 'black', '', 'g70', 'g20'),
        ('logo',        'dark gray', '', '', 'g30', ''),

        ('body',        '', '', 'standout', 'g70', 'g10'),
        ('selected',    'white', 'dark red', ('bold','underline'), 'g90', '#800'),
        ('focus',       'white', 'dark blue', 'standout', 'g90', '#008'),
        ('selected focus',
                        'white', 'dark magenta', ('bold','standout','underline'), '#fff', '#707'),
        ('dirmark',     'white', '', 'standout'),
        # logging
        ('debug',       'light blue', 'black', 'underline', '#69f', 'g20'),
        ('info',        'light green', 'black', 'underline', '#0b0', 'g20'),
        ('warning',     'yellow', 'black', 'underline', '#cc0', 'g20'),
        ('error',       'light red', 'black', 'underline', '#c00', 'g20'),
        ('critical',    'white', 'dark red', 'underline', '#fff', '#800'),
    ]
    formatter = logging.Formatter(
        '%(asctime)s %(levelname)-7.7s %(funcName)s: %(message)s',
        '%Y-%m-%d %H:%M:%S')

    # Utility classes
    # Derived classes from the TreeListBox in the utk module.
    class SideTree(TreeListBox):
        '''Display widget for leaf nodes.'''
        def __init__(self, body, statxt):
            super(SideTree, self).__init__(body)
            self.statxt = statxt

        def keypress(self, size, key):
            return super(SideTree, self).keypress(size, key)

    class LeafWidget(TreeWidget):
        '''Display widget for leaf nodes.'''
        def get_display_text(self):
            return self.get_node().get_value()['name']

    class BranchWidget(ParentWidget):
        '''Display widget for interior/parent nodes.'''
        def get_display_text(self):
            return self.get_node().get_value()['name']

    class LeafNode(TreeNode):
        '''Data storage object for leaf nodes.'''
        def load_widget(self):
            return LeafWidget(self)

    class BranchNode(ParentNode):
        '''Data storage object for interior/parent nodes.'''
        def load_widget(self):
            return BranchWidget( self,
                expanded=(False if self._parent else True) )

        def load_child_keys(self):
            data = self.get_value()
            return range(len(data['children']))

        def load_child_node(self, key):
            '''Return either an LeafNode or BranchNode.'''
            childdata = self.get_value()['children'][key]
            childdepth = self.get_depth() + 1
            if 'children' in childdata:
                childclass = BranchNode
            else:
                childclass = LeafNode
            return childclass(childdata, parent=self, key=key, depth=childdepth)

    class mutable_list(list): pass  # in order to attach attribs

    class _StatusBarHandler(logging.Handler):
        'Log to Statusbar.'
        def __init__(self, statusbar, level=logging.NOTSET):
            logging.Handler.__init__(self, level=level)
            self.statusbar = statusbar

        def emit(self, record):
            try:
                msg = self.format(record)
                if record.levelname in msg:
                    part1, levelname, part2 = msg.partition(record.levelname)
                    msg = [part1, (levelname.lower(), levelname), part2]
                self.statusbar.set_text(msg)
                u.AttrMap(self.statusbar, 'footer')
            except:
                self.handleError(record)

    class DBField(object):
        'Field that writes its value to Database on Enter key.'
        def unhandled_input(self, size, input, get_value_method):
            if input == 'enter':                    # submit data
                dbinf = self._db_inf
                gparent = dbinf['gparent']          # dumbo self.
                if not gparent.db:  return input    # using dummy data

                # get inner value and create sql assignment string
                myvalue = get_value_method()
                if isinstance(myvalue, basestring): # quote strings
                    myvalue = "'%s'" % myvalue.replace("'", "''")
                dbinf['pair'] = '%s = %s' % (dbinf['fdname'], myvalue)

                # create query string and execute
                q = gparent.config['dbtype']['query_update'] % dbinf
                gparent.db.query(dbinf['dbname'], q, fetchresults=False)
                self.set_edit_text(get_value_method())
                self._orig = get_value_method() # in case blur before commit
            elif input in ('tab','left','right','up','down'):  # restore
                if hasattr(self, '_orig'): self.set_edit_text(self._orig)
                return input
            else:
                return input

    class EditDBStr(u.Edit, DBField):
        'An Edit widget for strings that may write to a Database.'
        def __init__(self, *args, **kwargs):
            self.maxlen = kwargs.pop('maxlen', None)
            self.__super.__init__(*args, **kwargs)
            self._orig = self.get_edit_text() # keep for later in case no commit
        def keypress(self, size, key):
            key = self.__super.keypress(size, key)
            myvalue = self.get_edit_text()
            if self.maxlen and len(myvalue) >= self.maxlen:
                self.set_edit_text(myvalue[:self.maxlen])
            return self.unhandled_input(size, key, self.get_edit_text)

    class EditDBInt(u.IntEdit, DBField):
        'An Edit widget for integers that may write to a Database.'
        def __init__(self, *args, **kwargs):
            self.maxint = kwargs.pop('maxint', None)
            self.__super.__init__(*args, **kwargs)
            self._orig = self.value()  # keep for later in case no commit
        def valid_char(self, ch):
            return len(ch)==1 and ch in '-0123456789'
        def keypress(self, size, key):
            if self.edit_text == '-0' and key == 'backspace':  # before handler
                self.edit_text = ''
            key = self.__super.keypress(size, key)
            if '-' in self.edit_text:
                self.edit_text = '-' + self.edit_text.replace('-', '') # > 1
                if self.edit_text == '-':   # long() doesn't like '-'
                    self.edit_text = '-0'
                    self.set_edit_pos(2)
                elif self.edit_text == '-0':
                    self.edit_text = ''
            if self.maxint:
                val = self.value()
                if val >= self.maxint:
                    self.set_edit_text(str(self.maxint - 1))
                elif val <= (-self.maxint) - 1: #
                    self.set_edit_text(str(-self.maxint))

            return self.unhandled_input(size, key, self.value)


class DbConnector(object):
    'Keep track of DB connections.'
    def __init__(self, module):
        self.conns = {}
        try:
            self.module = __import__(module)
        except ImportError, e:
            raise RuntimeError, 'Database API module not found.'

    def close(self, conn=None):
        'Close one or all open connections.'
        if conn:
            self.cons[conn].close()
            self.cons[conn] = None
        else:
            for c in self.conns:
                log.debug('dbconn:' + repr(self.conns[c]))
                if self.conns.get(c): self.conns[c].close()

    def connect(self, name, **kwargs):
        'Connecten-Sie to die Database.'
        dsn = []
        for item in kwargs.items():
            if item[1]:  # not blank
                dsn.append("%s='%s'" % item)
        dsn = ' '.join(dsn)
        log.debug(self.module.__name__ + ':' + `kwargs`)

        conn = self.module.connect(dsn);
        self.conns[name] = conn

    def query(self, dbname, querystr, fetchresults=True):
        'Query database.'
        try:
            import psycopg2
        except ImportError:
            class dummy(str): pass
            psycopg2 = dummy()  # :/
            psycopg2.ProgrammingError, psycopg2.InternalError = None, None
        retval = True # success

        cur = self.conns[dbname].cursor()
        try:
            log.info('"%s" against %s' % (querystr, dbname))
            cur.execute(querystr)
            if fetchresults:    results = cur.fetchall()
            else:               results = None
            log.debug('results: %.512r...' % results)
            retval = results
        except (psycopg2.ProgrammingError, psycopg2.InternalError), e:  # fix trans
            cur.execute('rollback;')    # cannot recover without this
            msg = '%s: %s' % (e.__class__.__name__, e)
            log.error(msg.rstrip())
            retval = False  # known err
        except Exception, e:
            msg = '%s: %s' % (e.__class__.__name__, e)
            log.error(msg.rstrip())
            retval = None   # generic err

        return retval


class DumboFrame(u.Frame):
    '''The main window of the application.'''
    def __init__(self, args):
        self.palette = defpalette       # defaults to fall back on
        self.config = defconfig
        self.load_config(args)          # read in ini file
        self.greeting = ' Ready!'
        self.legendcache = {}           # keeps track of db/tbl/col names/types

        # set up header and footer
        menubar = u.AttrMap(u.Text(''), 'header')  # todo
        exitbut = ( u'\u2715' if unichar_avail else 'x')
        exitbut = Button(exitbut, align='right', on_press=self.on_exit_but)
        exitbut = u.AttrMap(exitbut, 'header')
        header = u.Columns( [menubar, ('fixed', 3, exitbut)], 0 )
        # footer
        self.statxt = u.Text(self.greeting)
        footttl = u.AttrMap(u.Text(title, align='right'), 'footer')
        footer = u.Columns([
            ('weight', 1, self.statxt),
            ('fixed', len(title), footttl)
            ], 1)
        footer = u.AttrMap(footer, 'footer')

        # log to status bar
        hdlr = _StatusBarHandler(self.statxt)
        formatter = logging.Formatter(
            ' %(levelname)s %(funcName)s: %(message)s')
        hdlr.setFormatter(formatter)
        log.addHandler(hdlr)

        # populate sidebar
        try:
            self.db = DbConnector(self.config['dbtype']['module'])
        except (TypeError, IndexError, RuntimeError, KeyError), e:
            log.error('%s: %s' % (e.__class__.__name__, e))
            log.warn('Unable to connect to database using config, falling ' +
                'back to demo mode.')
            self.db = None
        db_objs = self.populate_sidebar()
        self.sidebar = SideTree(TreeWalker(BranchNode(db_objs)), self.statxt)

        # populate content pane
        font = ( u.font.HalfBlock5x4Font() if unichar_avail
            else u.font.Thin6x6Font() )
        bt = u.BigText( ('logo', title), font)
        self.logo = u.Padding(bt, 'right', width='clip')
        self.contpane = u.ListBox([u.Text(''), self.logo])

        mainbody = u.Columns([
            ('weight', 1, u.AttrMap(self.sidebar, 'left')),
            ('weight', 3, u.AttrMap(self.contpane, 'right')),
        ], 1)  # 1 char spacer
        super(DumboFrame, self).__init__(mainbody, header=header, footer=footer)

    def on_exit_but(self, args):
        raise u.ExitMainLoop()

    def get_tbl_legend(self, dbname, tablename):
        'Retreive the column metadata from a table.'
        key = (dbname, tablename)
        legend = self.legendcache.get(key)
        if legend:
            log.debug('Using cached legend: %s' % legend)
        else:
            try: # get table legend
                q = self.config['dbtype']['query_tablecols'] % tablename
                results = self.db.query(dbname, q)
                legend = mutable_list( results )
                for colmd in legend:
                    log.debug( repr(colmd) )

                # attempt retrieval of primary key info
                legend.pkeys = None
                q2 = self.config['dbtype'].get('query_tablecols2')
                if q2:
                    q2 = q2 % tablename
                    results = self.db.query(dbname, q2)
                    if results:
                        legend.pkeys = results
                self.legendcache[key] = legend
            except Exception, e:
                import traceback
                log.error('Legend not found: %s' % traceback.format_exc())
        return legend

    def list_db_cluster(self):
        'Find the dbs and tables at this connection.'
        dbconns = self.db.conns
        dbparams =  self.config['db']
        primarydb = dbparams['dbname']
        tbfilters = dbparams.pop('tablefilters', None)
        if tbfilters:
            if not type(tbfilters) is tuple:
                tbfilters = (tbfilters,)
        else:
            tbfilters = tuple()
        treedata = []

        # list databases
        self.db.connect(primarydb, **dbparams)
        cur = dbconns[primarydb].cursor()
        cur.execute(self.config['dbtype']['query_databases'])
        for db in cur.fetchall():
            dbname = str(db[0])
            if dbname != primarydb:
                dbconns[dbname] = None  # prepare for multiple connections.

        # list tables under each database, pg needs a uniq conn for each.
        for dbname in dbconns:
            if not dbconns.get(dbname):     # set up new conns to database
                dbparams['dbname'] = dbname
                try:
                    self.db.connect(dbname, **dbparams)
                except Exception:
                    continue

            dbattrs = dict(name=dbname)
            children = []
            cur = dbconns[dbname].cursor()
            cur.execute(self.config['dbtype']['query_tables'])
            for tablename in cur.fetchall():
                match = False
                for dbf in tbfilters:    #  :/
                    if dbf in tablename[0]:
                        match = True
                if not match:
                    children.append(dict(name=str(tablename[0])))
            dbattrs['children'] = sorted( children, key=(lambda k: k['name']) )
            treedata.append(dbattrs)
        return sorted( treedata, key=(lambda k: k['name']) )

    def load_config(self, args):
        'Search for and read in config file, then set up a few things.'
        import csv
        def convert_type(value):
            'convert values where possible'
            value = value.strip()
            if value.isdigit():     value = int(value)
            elif value == 'False':  value = False
            elif value == 'True':   value = True
            elif ',' in value:
                values = csv.reader([value],
                    quoting=csv.QUOTE_MINIMAL, skipinitialspace=True).next()
                values = tuple( x.strip() for x in values )
                value = values
            return value

        # find ini file
        inifname = None
        if args:
            if os.access(args[0], os.R_OK):
                inifname = args[0]
            else:
                print 'Error: filename "%s" not found.' % args[0]
                sys.exit(3)
        else:
            for path in inipath:
                path = os.path.expanduser(path)
                if os.access(path, os.R_OK):
                    inifname = path
        if inifname:
            cp = rcp()
            cp.read(inifname)
            config = dict(  (section, dict(cp.items(section)))  # conv to dicts
                            for section in cp.sections()   )

            # get theme info
            theme = config[appname]['theme']
            theme = config.get('theme_' + theme)
            palette = []
            for item in theme.items():
                palette.append( (item[0],) + convert_type(item[1]) )

            # get db info and copy to root
            dbsection = 'db_' + config[appname]['db']
            config['db'] = config.get(dbsection)
            if config['db']:
                if 'tablefilters' in config['db']:
                    config['db']['tablefilters'] = (
                        convert_type(config['db']['tablefilters']) )
                dbtypesect = 'dbtype_' + config['db'].pop('type', '')
                config['dbtype'] = config.get(dbtypesect)
                if config['dbtype']:
                    config[appname]['use256'] = (config[appname]['use256'].title() == 'True')
                    self.config, self.palette = config, palette
                else:
                    raise RuntimeError, 'Database Type section "%s" not found. ' % dbtypesect
            else:
                raise RuntimeError, 'Database section "%s" not found. ' % dbsection
        else:
            log.error('ini file not found.')

    def onActivate(self, input):
        'An object in the sidebar has been activated.'
        i = self.body.get_focus_column()
        item, pos = self.sidebar.get_focus()
        itemtype = 'Table'
        if type(item) is BranchWidget:    # XP behavior, on open close others
            itemtype = 'Database'
            for method in ('next_sibling', 'prev_sibling'):
                brother = item
                while True:   # this sucks, no simple traversal
                    brother = getattr(brother.get_node(), method)()
                    if not brother:  break
                    brother = brother.get_widget()
                    if type(brother) is BranchWidget:
                        brother.expanded = False
                        brother.update_widget()
            item.expanded = not item.expanded
            item.update_widget()

        if self.db:
            currname = item.get_display_text()
            txt = '%s "%s" activated.' % (itemtype, currname )
            log.info(str(input).upper() + ', %s' % txt)

            if itemtype == 'Table':
                # get db name
                dbname = item.get_node().get_parent().get_value()['name']

                # get table legend and data
                legend = self.get_tbl_legend(dbname, currname)
                if legend.pkeys:
                    pkeys = ','.join( (str(x[1]) for x in legend.pkeys ) )
                    orderby = 'order by %s' % pkeys
                elif legend.pkeys and ('id' in [ x[1] for x in legend.pkeys ]):
                    orderby = 'order by id'
                else:
                    orderby = ''

                q = self.config['dbtype']['query_table'] % (currname, orderby)
                results = self.db.query(dbname, q)
                if results:
                    self.statxt.set_text(self.greeting)
                elif results is False:  # fallback, try again
                    q = 'select * from %s;' % currname
                    results = self.db.query(dbname, q)
                self.populate_cont(results or [], dbname, currname, legend)
        else:
            if type(item) is LeafWidget:
                legend = mutable_list(
                    [[1, 'id', 'character varying', None, 'YES', 255, None]] )
                legend.pkeys = ((1, 'id'),)
                for i in range(2,10):
                    dummytype = legend[0][:]  # copy
                    dummytype[0] = i
                    dummytype[1] = 'col%02d' % i
                    legend.append(dummytype)
                dummy = ('The quick brown fox jumped over the lazy dog.'.split()
                    ,) * 20
                self.populate_cont(dummy, legend=legend)

    def populate_cont(self, data, dbname=None, tbname=None, legend=None):
        'Load up the content pane.'
        rows = []
        if legend:  # show name/type as column header
            row = [ u.AttrMap( u.Text('%s\n%s' % (x[1],x[2])), 'logo' )
                    for x in legend ]
            rows.append( u.Columns(row, 1, 0, 4, ) )
            if hasattr(legend, 'pkeys') and legend.pkeys:
                pkeys = legend.pkeys
            else:
                pkeys = None
            log.debug('pkeys:' + repr(pkeys))
            # figure which col is which field, could be more efficient
            nmfromi = dict(( (i,leg[1]) for i,leg in enumerate(legend) ))
            ifromnm = dict(( (leg[1], i) for i,leg in enumerate(legend) ))

            for row in data:
                try:
                    if not pkeys:  raise KeyError
                    newrow = []
                    # save primary key for later inside edit cell
                    where = ''  #  pkstr = val, ...
                    for j, pkindex in enumerate(pkeys):  # pkindex is 1-based
                        pkindex, pkstr = pkindex
                        if legend[pkindex-1][2] == 'integer':
                            where += '%s = %s' % (pkstr, row[pkindex-1])
                        else:
                            where += "%s = '%s'" % (pkstr, row[pkindex-1])
                        if j != len(pkeys) - 1:
                            where += ' and '
                    log.debug('where clause: ' + where)

                    # populate pane, modest type enforcement
                    for i, field in enumerate(row):
                        if legend[i][2] == 'integer':
                            maxint = 2**(legend[i][6]-1)-1
                            editor = EditDBInt('', field, maxint=maxint)
                        else:
                            editor = EditDBStr('', str(field), maxlen=legend[i][5])
                        editor._db_inf = { 'where': where,
                            'dbname': dbname, 'tbname': tbname,
                            'fdname': nmfromi[i], 'gparent': self,
                        }
                        newrow.append( u.AttrMap(editor, 'right', 'focus') )
                except KeyError:  # fall back to read only.
                    newrow = [ u.AttrMap(u.Text(str(x)), 'right') for x in row ]
                rows.append( u.Columns(newrow, 1, None, 4, ) )
        else:
            for row in data:
                row = [ u.AttrMap(u.Text(str(x)), 'right') for x in row ]
                rows.append( u.Columns(row, 1, None, 4, ) )

        self.contpane.body = u.SimpleListWalker(rows + [u.Text(''), u.Text(''),
            self.logo])

    def populate_sidebar(self):
        'Load up the sidebar.'
        if self.db:
            treedata = self.list_db_cluster()
            treedata = { 'name': 'Databases', 'children': treedata }
        else:
            log.warn('Database not found, using dummy data.')
            children = [ dict(name='child%s' % i) for i in range(10) ]
            children[3]['children'] = [ dict(name='child%s' % i) for i in range(10) ]
            children[5]['children'] = [ dict(name='child%s' % i) for i in range(10) ]
            treedata = {    'name': 'Databases (N/A)',
                        'children': children
            }
        return treedata

    def unhandled_input(self, input):
        '''Handle input that wasn't already.'''
        if self.db: dbconns = self.db.conns
        else:       dbconns = ()
        i = self.body.get_focus_column()
        log.debug('focus in column:%s' % i)

        if input in ('q', 'Q', 'esc'):
            if self.db: self.db.close()
            raise u.ExitMainLoop()
        elif input in ('tab', 'right'):
            try:
                self.body.set_focus(i+1)
                # keep focus out of legend, doesn't work with right key :/
                if self.contpane.get_focus()[1] == 0:
                    self.contpane.set_focus(1, coming_from='above')
            except AssertionError:  self.body.set_focus(0)
            log.debug('tab: col %s to %s' % (i, i+1))

        elif i == 0:  # self.sidebar
            if input == 'enter':
                self.onActivate(input)
            elif type(input) is tuple:  # mouse event
                if input[0] == 'mouse release' and input[1] in (0,1):
                    self.onActivate(input)
        else:
            log.debug(str(input))


if __name__=='__main__':
    parser = OptionParser(usage=__doc__.rstrip(), version=__version__)
    parser.add_option(
        '-l', '--logfile', metavar="F", default='log_dumbo.txt',
        help='Log activity to this file. Default: %default.')
    parser.add_option('-v', '--verbose', action='store_true',
        help='Enable verbose output to log.')
    parser.add_option('-V', '--very-verbose', action='store_true',
        help='Enable ridiculous amounts of debugging output.')

    (opts, args) = parser.parse_args()

    # set up logging
    log = logging.getLogger(__name__)
    log.setLevel( (logging.DEBUG if debug else logging.WARN) )
    if opts.verbose:        log.setLevel(logging.INFO)
    if opts.very_verbose:   log.setLevel(logging.DEBUG)
    hdlr = logging.FileHandler(opts.logfile)
    hdlr.setFormatter(formatter)
    log.addHandler(hdlr)

    # get started
    df = DumboFrame(args)

    loop = u.MainLoop(df, df.palette, unhandled_input=df.unhandled_input)
    if df.config and df.config[appname]['use256'] and hicolor_avail:
        loop.screen.set_terminal_properties(colors=256)
    try:
        loop.run()
    except Exception, e:    # try to close all db connections
        print e.__class__.__name__, e, '.  Check log for details.\n'
        import traceback
        log.critical(traceback.format_exc())
        if df.db:
            df.db.close()