def get_vector_result(self, order_params):
"""
Queries vector data for stats and updates the CSV element for output
:param order_params: params to query for
:param csv_element: The CSV row to update
:return: None
"""
result_data = None
vector_url = VECTOR_TYPE_QUERY.substitute(upper=str(order_params.top), right=str(order_params.right),
lower=str(order_params.bottom), left=str(order_params.left))
headers = self.headers.copy()
headers[HEADER_CONTENT_TYPE] = CONTENT_TYPE_JSON
for i in range(0, NUM_TIMES_TO_TRY):
response = None
try:
request = urllib2.Request(vector_url, None, headers)
response = self.opener.open(request)
response_data = response.read()
result_data = json.loads(response_data, strict=False)
self.is_login_successful = True
except Exception, e:
self.is_login_successful = False
QgsMessageLog.instance().logMessage("Unable to hit the vector end point due to: " + str(e) + "; trying "
+ str(NUM_TIMES_TO_TRY - i - 1)
+ " more times.", TAG_NAME, level=QgsMessageLog.CRITICAL)
if response and self.is_login_successful:
return result_data
def get_fk_set(layerName, fkName, skipFirst=1, fids=None, useProvider=False):
"""
skipFirst: number of initial lines to skip (header lines in excel)
"""
layer = layer_from_name(layerName)
freq = QgsFeatureRequest()
if fids is not None:
freq.setFilterFids(fids)
if not useProvider:
feats = [f for f in layer.getFeatures(freq)]
else:
feats = [f for f in layer.dataProvider().getFeatures(freq)]
fkSet = []
for f in feats[skipFirst:]:
QgsMessageLog.logMessage(
'FK {}'.format(f.attribute(fkName)), logTag, QgsMessageLog.CRITICAL)
fk = f.attribute(fkName)
if fk: # Skip NULL ids that may be reported from excel files
fkSet.append(fk)
return fkSet
def error(msg):
QgsMessageLog.logMessage(str(msg), logTag, QgsMessageLog.CRITICAL)
def warn(msg):
QgsMessageLog.logMessage(str(msg), logTag)
showWarning(str(msg))
def info(msg):
QgsMessageLog.logMessage(str(msg), logTag, QgsMessageLog.INFO)
def info(msg): # pragma: no cover
QgsMessageLog.logMessage(str(msg), conf.LOG_TAG, QgsMessageLog.INFO)
def error(msg): # pragma: no cover
QgsMessageLog.logMessage(str(msg), conf.LOG_TAG, QgsMessageLog.CRITICAL)
def warn(msg): # pragma: no cover
QgsMessageLog.logMessage(str(msg), conf.LOG_TAG)
def warn(msg):
QgsMessageLog.logMessage(str(msg), conf.LOG_TAG)
def info(msg):
QgsMessageLog.logMessage(str(msg), conf.LOG_TAG, QgsMessageLog.INFO)
def error(msg):
QgsMessageLog.logMessage(str(msg), conf.LOG_TAG, QgsMessageLog.CRITICAL)
def register_function(function, arg_count, group, usesgeometry=False,
referenced_columns=[QgsFeatureRequest.ALL_ATTRIBUTES], **kwargs):
"""
Register a Python function to be used as a expression function.
Functions should take (values, feature, parent) as args:
Example:
def myfunc(values, feature, parent):
pass
They can also shortcut naming feature and parent args by using *args
if they are not needed in the function.
Example:
def myfunc(values, *args):
pass
Functions should return a value compatible with QVariant
Eval errors can be raised using parent.setEvalErrorString("Error message")
:param function:
:param arg_count:
:param group:
:param usesgeometry:
:return:
"""
class QgsPyExpressionFunction(QgsExpressionFunction):
def __init__(self, func, name, args, group, helptext='', usesGeometry=True,
referencedColumns=QgsFeatureRequest.ALL_ATTRIBUTES, expandargs=False):
QgsExpressionFunction.__init__(self, name, args, group, helptext)
self.function = func
self.expandargs = expandargs
self.uses_geometry = usesGeometry
self.referenced_columns = referencedColumns
def func(self, values, context, parent, node):
feature = None
if context:
feature = context.feature()
try:
if self.expandargs:
values.append(feature)
values.append(parent)
if inspect.getargspec(self.function).args[-1] == 'context':
values.append(context)
return self.function(*values)
else:
if inspect.getargspec(self.function).args[-1] == 'context':
self.function(values, feature, parent, context)
return self.function(values, feature, parent)
except Exception as ex:
parent.setEvalErrorString(str(ex))
return None
def usesGeometry(self, node):
return self.uses_geometry
def referencedColumns(self, node):
return self.referenced_columns
helptemplate = string.Template("""<h3>$name function</h3><br>$doc""")
name = kwargs.get('name', function.__name__)
helptext = kwargs.get('helpText') or function.__doc__ or ''
helptext = helptext.strip()
expandargs = False
if arg_count == "auto":
# Work out the number of args we need.
# Number of function args - 2. The last two args are always feature, parent.
args = inspect.getargspec(function).args
number = len(args)
arg_count = number - 2
if args[-1] == 'context':
arg_count -= 1
expandargs = True
register = kwargs.get('register', True)
if register and QgsExpression.isFunctionName(name):
if not QgsExpression.unregisterFunction(name):
msgtitle = QCoreApplication.translate("UserExpressions", "User expressions")
msg = QCoreApplication.translate("UserExpressions",
"The user expression {0} already exists and could not be unregistered.").format(
name)
QgsMessageLog.logMessage(msg + "\n", msgtitle, Qgis.Warning)
return None
function.__name__ = name
helptext = helptemplate.safe_substitute(name=name, doc=helptext)
f = QgsPyExpressionFunction(function, name, arg_count, group, helptext, usesgeometry, referenced_columns,
expandargs)
# This doesn't really make any sense here but does when used from a decorator context
# so it can stay.
if register:
QgsExpression.registerFunction(f)
return f
def info(msg):
QgsMessageLog.logMessage(str(msg), logTag, QgsMessageLog.INFO)
