Your OS may care if you pulled the plug, but weewx does not. Any temporary
files created by it will be written over at the next file generation.

The log confirms that somehow the filename is being presented in Unicode
(instead as an ordinary string). Now we need to figure out why.

Again, please replace with the attached.

Rather than run weewxd itself, you can just run wee_reports. Then post the


On Sat, Oct 15, 2016 at 4:04 AM, Pier Francesco Costa <
> wrote:

> Thanks for your answers!
> @Glenn
> Yeah, I pulled the the plug at the wall. I know that is not the right way,
> but I am trying to build a something to be used by people that don't know
> how to operate a pi.
> So I'd like to find a way to automatically recover from this error, maybe
> writing a script to delete the temporary files on startup.
> If this is really the problem, where I can find the temp files generated
> by cheetah?
> @Tom
> I have attached skin.conf and log.
> Pier
> --
> You received this message because you are subscribed to the Google Groups
> "weewx-user" group.
> To unsubscribe from this group and stop receiving emails from it, send an
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For more options, visit
#    Copyright (c) 2009-2015 Tom Keffer <>
#    See the file LICENSE.txt for your full rights.
"""Generate files from templates using the Cheetah template engine.

For more information about Cheetah, see

Configuration Options

  search_list = a, b, c              # list of classes derived from SearchList
  search_list_extensions = d, e, f   # will be appended to search_list. Each should be a list.
  encoding = (html_entities|utf8|strict_ascii)
  template = filename.tmpl           # must end with .tmpl
  stale_age = s                      # age in seconds

The strings YYYY and MM will be replaced if they appear in the filename.

search_list will override the default search_list

search_list_extensions will be appended to search_list

Generally it is better to extend by using search_list_extensions rather than
search_list, just in case the default search list changes.


    # How to specify search list extensions:
    search_list_extensions = user.forecast.ForecastVariables, user.extstats.ExtStatsVariables
    encoding = html_entities      # html_entities, utf8, strict_ascii
    [[SummaryByMonth]]                              # period
        [[[NOAA_month]]]                            # report
            encoding = strict_ascii
            template = NOAA-YYYY-MM.txt.tmpl
            encoding = strict_ascii
            template = NOAA-YYYY.txt.tmpl
            template = index.html.tmpl
            template = week.html.tmpl
    [[wuforecast_details]]                 # period/report
        stale_age = 3600                   # how old before regenerating
        template = wuforecast.html.tmpl
    [[nwsforecast_details]]                # period/report
        stale_age = 10800                  # how old before generating
        template = nwsforecast.html.tmpl


from __future__ import with_statement
import os.path
import syslog
import time

import configobj

import Cheetah.Template
import Cheetah.Filters

import weeutil.weeutil
import weewx.almanac
import weewx.reportengine
import weewx.station
import weewx.units
import weewx.tags
from weeutil.weeutil import to_bool, to_int, timestamp_to_string

# Default search list:
default_search_list = [

def logmsg(lvl, msg):
    syslog.syslog(lvl, 'cheetahgenerator: %s' % msg)

def logdbg(msg):
    logmsg(syslog.LOG_DEBUG, msg)

def loginf(msg):
    logmsg(syslog.LOG_INFO, msg)

def logerr(msg):
    logmsg(syslog.LOG_ERR, msg)

def logcrt(msg):
    logmsg(syslog.LOG_CRIT, msg)

# =============================================================================
# CheetahGenerator
# =============================================================================

class CheetahGenerator(weewx.reportengine.ReportGenerator):
    """Class for generating files from cheetah templates.
    Useful attributes (some inherited from ReportGenerator):

        config_dict:      The weewx configuration dictionary 
        skin_dict:        The dictionary for this skin
        gen_ts:           The generation time
        first_run:        Is this the first time the generator has been run?
        stn_info:         An instance of weewx.station.StationInfo
        formatter:        An instance of weewx.units.Formatter
        converter:        An instance of weewx.units.Converter
        search_list_objs: A list holding search list extensions
        db_binder:        An instance of weewx.manager.DBBinder from which the data should be extracted

    generator_dict = {'SummaryByMonth': weeutil.weeutil.genMonthSpans,
                      'SummaryByYear' : weeutil.weeutil.genYearSpans}

    def run(self):
        """Main entry point for file generation using Cheetah Templates."""

        t1 = time.time()

        # Make a copy of the skin dictionary (we will be modifying it):
        gen_dict = configobj.ConfigObj(self.skin_dict.dict())
        # Look for options in [CheetahGenerator], but accept options from
        # [FileGenerator] for backward compatibility.  
        option_section_name = "CheetahGenerator" if gen_dict.has_key('CheetahGenerator') else "FileGenerator"
        # The default summary time span is 'None'.
        gen_dict[option_section_name]['summarize_by'] = 'None'

        # determine how much logging is desired
        log_success = to_bool(gen_dict[option_section_name].get('log_success', True))

        # configure the search list extensions

        # Generate any templates in the given dictionary:
        ngen = self.generate(gen_dict[option_section_name], self.gen_ts)


        elapsed_time = time.time() - t1
        if log_success:
            loginf("Generated %d files for report %s in %.2f seconds" %
                   (ngen, self.skin_dict['REPORT_NAME'], elapsed_time))

    def setup(self):
        self.outputted_dict = {'SummaryByMonth' : [], 'SummaryByYear'  : [] }

        self.formatter = weewx.units.Formatter.fromSkinDict(self.skin_dict)
        self.converter = weewx.units.Converter.fromSkinDict(self.skin_dict)

    def initExtensions(self, gen_dict):
        """Load the search list"""
        self.search_list_objs = []

        search_list = weeutil.weeutil.option_as_list(gen_dict.get('search_list'))
        if search_list is None:
            search_list = list(default_search_list)

        search_list_ext = weeutil.weeutil.option_as_list(gen_dict.get('search_list_extensions'))
        if search_list_ext is not None:

        # Now go through search_list (which is a list of strings holding the names of the extensions):
        for c in search_list:
            x = c.strip()
            if x:
                # Get the class
                class_ = weeutil.weeutil._get_object(x)
                # Then instantiate the class, passing self as the sole argument
    def teardown(self):
        """Delete any extension objects we created to prevent back references
        from slowing garbage collection"""
        while len(self.search_list_objs):
            del self.search_list_objs[-1]
    def generate(self, section, gen_ts):
        """Generate one or more reports for the indicated section.  Each section
        in a period is a report.  A report has one or more templates.

        section: A ConfigObj dictionary, holding the templates to be generated. Any
        subsections in the dictionary will be recursively processed as well.
        gen_ts: The report will be current to this time.
        ngen = 0
        # Go through each subsection (if any) of this section,
        # generating from any templates they may contain
        for subsection in section.sections:
            # Sections 'SummaryByMonth' and 'SummaryByYear' imply summarize_by certain time spans
            if not section[subsection].has_key('summarize_by'):
                if subsection == 'SummaryByMonth':
                    section[subsection]['summarize_by'] = 'SummaryByMonth'
                elif subsection == 'SummaryByYear':
                    section[subsection]['summarize_by'] = 'SummaryByYear'
            # Call myself recursively, to generate any templates in this subsection
            ngen += self.generate(section[subsection], gen_ts)

        # We have finished recursively processing any subsections in this
        # section. Time to do the section itself. If there is no option
        # 'template', then there isn't anything to do. Return.
        if not section.has_key('template'):
            return ngen
        # Change directory to the skin subdirectory.  We use absolute paths
        # for cheetah, so the directory change is not necessary for generating
        # files.  However, changing to the skin directory provides a known
        # location so that calls to os.getcwd() in any templates will return
        # a predictable result.

        report_dict = weeutil.weeutil.accumulateLeaves(section)
        (template, dest_dir, encoding, default_binding) = self._prepGen(report_dict)

        # Get start and stop times        
        default_archive = self.db_binder.get_manager(default_binding)
        start_ts = default_archive.firstGoodStamp()
        if not start_ts:
            loginf('Skipping template %s: cannot find start time' % section['template'])
            return ngen

        if gen_ts:
            record = default_archive.getRecord(gen_ts, max_delta=to_int(report_dict.get('max_delta')))
            if record:
                stop_ts = record['dateTime']
                loginf('Skipping template %s; generate time %s not in database' % (section['template'], timestamp_to_string(gen_ts)) )
                return ngen
            stop_ts = default_archive.lastGoodStamp()
        # Get an appropriate generator function
        summarize_by = report_dict['summarize_by']
        if summarize_by in CheetahGenerator.generator_dict:
            _spangen = CheetahGenerator.generator_dict[summarize_by]
            # Just a single timespan to generate. Use a lambda expression.
            _spangen = lambda start_ts, stop_ts : [weeutil.weeutil.TimeSpan(start_ts, stop_ts)]

        # Use the generator function
        for timespan in _spangen(start_ts, stop_ts):

            # Save YYYY-MM so they can be used within the document
            if summarize_by in CheetahGenerator.generator_dict:
                timespan_start_tt = time.localtime(timespan.start)
                _yr_str = "%4d" % timespan_start_tt[0]
                if summarize_by == 'SummaryByMonth':
                    _mo_str = "%02d" % timespan_start_tt[1]
                    if _mo_str not in self.outputted_dict[summarize_by]:
                        self.outputted_dict[summarize_by].append("%s-%s" % (_yr_str, _mo_str))
                if summarize_by == 'SummaryByYear' and _yr_str not in self.outputted_dict[summarize_by]:

            # figure out the filename for this template
            _filename = self._getFileName(template, timespan)
            _fullname = os.path.join(dest_dir, _filename)

            # Skip summary files outside the timespan
            if report_dict['summarize_by'] in CheetahGenerator.generator_dict \
                    and os.path.exists(_fullname) \
                    and not timespan.includesArchiveTime(stop_ts):

            # skip files that are fresh, but only if staleness is defined
            stale = to_int(report_dict.get('stale_age'))
            if stale is not None:
                t_now = time.time()
                    last_mod = os.path.getmtime(_fullname)
                    if t_now - last_mod < stale:
                        logdbg("Skip '%s': last_mod=%s age=%s stale=%s" %
                               (_filename, last_mod, t_now - last_mod, stale))
                except os.error:

            searchList = self._getSearchList(encoding, timespan,
            tmpname = _fullname + '.tmp'
                syslog.syslog(syslog.LOG_INFO, "cheetahgenerator: template name is %s" % template)
                syslog.syslog(syslog.LOG_INFO, "****              its type is %s" % type(template))
                text = Cheetah.Template.Template(file=template,
                with open(tmpname, mode='w') as _file:
                    print >> _file, text
                os.rename(tmpname, _fullname)
            except Exception, e:
                logerr("Generate failed with exception '%s'" % type(e))
                logerr("**** Ignoring template %s" % template)
                logerr("**** Reason: %s" % e)
                weeutil.weeutil.log_traceback("****  ")
                ngen += 1
                except OSError:

        return ngen

    def _getSearchList(self, encoding, timespan, default_binding):
        """Get the complete search list to be used by Cheetah."""

        # Get the basic search list
        timespan_start_tt = time.localtime(timespan.start)
        searchList = [{'month_name' : time.strftime("%b", timespan_start_tt),
                       'year_name'  : timespan_start_tt[0],
                       'encoding'   : encoding},
        # Bind to the default_binding:
        db_lookup = self.db_binder.bind_default(default_binding)
        # Then add the V3.X style search list extensions
        for obj in self.search_list_objs:
            searchList += obj.get_extension_list(timespan, db_lookup)

        return searchList

    def _getFileName(self, template, timespan):
        """Calculate a destination filename given a template filename.
        Replace 'YYYY' with the year, 'MM' with the month.  Strip off any
        trailing .tmpl"""

        _filename = os.path.basename(template).replace('.tmpl', '')

        if _filename.find('YYYY') >= 0 or _filename.find('MM') >= 0:
            # Start by getting the start time as a timetuple.
            timespan_start_tt = time.localtime(timespan.start)
            # Get a string representing the year (e.g., '2009') and month
            _yr_str = "%4d"  % timespan_start_tt[0]
            _mo_str = "%02d" % timespan_start_tt[1]
            # Replace any instances of 'YYYY' with the year string
            _filename = _filename.replace('YYYY', _yr_str)
            # Do the same thing with the month
            _filename = _filename.replace('MM', _mo_str)

        return _filename

    def _prepGen(self, report_dict):
        """Get the template, destination directory, encoding, and default binding."""

        # -------- Template ---------
        template = os.path.join(self.config_dict['WEEWX_ROOT'],
        loginf('WEEWX_ROOT:%s, type: %s' % (WEEWX_ROOT, type(WEEWX_ROOT)))
        loginf('SKIN_ROOT: %s, type: %s' % (SKIN_ROOT, type(SKIN_ROOT)))
        loginf('skin:      %s, type: %s' % (skin, type(skin)))
        loginf('tmpl name: %s, type: %s' % (tmpl_name, type(tmpl_name)))
        loginf('template:  %s, type: %s' % (template, type(template)))
        # ------ Destination directory --------
        destination_dir = os.path.join(self.config_dict['WEEWX_ROOT'],
            # Create the directory that is to receive the generated files.  If
            # it already exists an exception will be thrown, so be prepared to
            # catch it.
        except OSError:

        # ------ Encoding ------
        encoding = report_dict.get('encoding', 'html_entities').strip().lower()
        if encoding == 'utf-8':
            encoding = 'utf8'

        # ------ Default binding ---------
        default_binding = report_dict['data_binding']

        return (template, destination_dir, encoding, default_binding)

# =============================================================================
# Classes used to implement the Search list
# =============================================================================

class SearchList(object):
    """Abstract base class used for search list extensions."""

    def __init__(self, generator):
        """Create an instance of SearchList.

        generator: The generator that is using this search list
        self.generator = generator

    def get_extension_list(self, timespan, db_lookup):  # @UnusedVariable
        """For weewx V3.x extensions. Should return a list
        of objects whose attributes or keys define the extension.
        timespan:  An instance of weeutil.weeutil.TimeSpan. This will hold the
                   start and stop times of the domain of valid times.

        db_lookup: A function with call signature db_lookup(data_binding), which
        returns a database manager and where data_binding is an optional binding
        name. If not given, then a default binding will be used.
        return [self]

class Almanac(SearchList):
    """Class that implements the '$almanac' tag."""

    def __init__(self, generator):
        SearchList.__init__(self, generator)

        celestial_ts = generator.gen_ts

        # For better accuracy, the almanac requires the current temperature
        # and barometric pressure, so retrieve them from the default archive,
        # using celestial_ts as the time

        # The default values of temperature and pressure
        temperature_C = 15.0
        pressure_mbar = 1010.0

        # See if we can get more accurate values by looking them up in the weather
        # database. The database might not exist, so be prepared for a KeyError exception.
            archive = self.generator.db_binder.get_manager()
        except KeyError:
            # If a specific time has not been specified, then use the timestamp
            # of the last record in the database.
            if not celestial_ts:
                celestial_ts = archive.lastGoodStamp()

            # Check to see whether we have a good time. If so, retrieve the record
            # from the database    
            if celestial_ts:
                # Look for the record closest in time. Up to one hour off is fine:    
                rec = archive.getRecord(celestial_ts, max_delta=3600)
                if rec is not None:
                    if 'outTemp' in rec:
                        temperature_C = weewx.units.convert(weewx.units.as_value_tuple(rec, 'outTemp'), "degree_C")[0]
                    if 'barometer' in rec:
                        pressure_mbar = weewx.units.convert(weewx.units.as_value_tuple(rec, 'barometer'), "mbar")[0]
        self.moonphases = generator.skin_dict.get('Almanac', {}).get('moon_phases', weeutil.Moon.moon_phases)

        altitude_vt = weewx.units.convert(generator.stn_info.altitude_vt, "meter")

        self.almanac = weewx.almanac.Almanac(celestial_ts,

class Station(SearchList):
    """Class that implements the $station tag."""

    def __init__(self, generator):
        SearchList.__init__(self, generator)
        self.station = weewx.station.Station(generator.stn_info,
class Stats(SearchList):
    """Class that implements the time-based statistical tags, such
    as $day.outTemp.max"""

    def get_extension_list(self, timespan, db_lookup):
            trend_dict = self.generator.skin_dict['Units']['Trend']
        except KeyError:
            trend_dict = {'time_delta' : 10800,
                          'time_grace' : 300}

        stats = weewx.tags.TimeBinder(db_lookup,

        return [stats]

class UnitInfo(SearchList):
    """Class that implements the $unit tag."""

    def __init__(self, generator):
        SearchList.__init__(self, generator)
        # This implements the $unit tag:
        self.unit = weewx.units.UnitInfoHelper(generator.formatter,
        # This implements the $obs tag:
        self.obs = weewx.units.ObsInfoHelper(generator.skin_dict)

class Extras(SearchList):
    """Class for exposing the [Extras] section in the skin config dictionary
    as tag $Extras."""

    def __init__(self, generator):
        SearchList.__init__(self, generator)
        # If the user has supplied an '[Extras]' section in the skin
        # dictionary, include it in the search list. Otherwise, just include
        # an empty dictionary.
        self.Extras = generator.skin_dict['Extras'] if generator.skin_dict.has_key('Extras') else {}
# =============================================================================
# Filters used for encoding
# =============================================================================

class html_entities(Cheetah.Filters.Filter):

    def filter(self, val, **dummy_kw): #@ReservedAssignment
        """Filter incoming strings so they use HTML entity characters"""
        if isinstance(val, unicode):
            filtered = val.encode('ascii', 'xmlcharrefreplace')
        elif val is None:
            filtered = ''
        elif isinstance(val, str):
            filtered = val.decode('utf-8').encode('ascii', 'xmlcharrefreplace')
            filtered = self.filter(str(val))
        return filtered

class strict_ascii(Cheetah.Filters.Filter):

    def filter(self, val, **dummy_kw): #@ReservedAssignment
        """Filter incoming strings to strip out any non-ascii characters"""
        if isinstance(val, unicode):
            filtered = val.encode('ascii', 'ignore')
        elif val is None:
            filtered = ''
        elif isinstance(val, str):
            filtered = val.decode('utf-8').encode('ascii', 'ignore')
            filtered = self.filter(str(val))
        return filtered
class utf8(Cheetah.Filters.Filter):

    def filter(self, val, **dummy_kw): #@ReservedAssignment
        """Filter incoming strings, converting to UTF-8"""
        if isinstance(val, unicode):
            filtered = val.encode('utf8')
        elif val is None:
            filtered = ''
            filtered = str(val)
        return filtered

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