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harvester.py
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harvester.py
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#!/usr/bin/python
'''
Harvester of (Great) Sorrow
Periodically check on availablity and details of various registered services and datasets.
This should be run on a scheduled basis from a service like cron.
'''
############################################################
# Imports
from owslib.wps import WebProcessingService
from owslib.wfs import WebFeatureService
from owslib.wcs import WebCoverageService
from owslib.wms import WebMapService
import psycopg2 # For database access
from psycopg2.extensions import adapt # adapt: secure qutoing e.g. adapt('LL\L') => 'LL\\L'; adapt("A'B") => 'A''B'
import time
import datetime
import traceback
import re
from harvester_pwd import dbDatabase, dbName, dbUsername, dbPassword, dbSchema
############################################################
# Constants
wpsVersion = '1.0.0'
wmsVersion = '1.1.1' # Christian says 1.3.0 is "weird", Rotterdam wms doesn't like 1.3.0!
wfsVersion = '1.1.0' # Montreuil only works with 1.0.0
wcsVersion = '1.1.1' # Rotterdam only works when this is set to 1.1.0
wcsVersionAlt = '1.1.0' # Rotterdam only works when this is set to 1.1.0
# Tables we will use
tables = { }
tables["wpsServers"] = dbSchema + ".wps_servers"
tables["processes"] = dbSchema + ".wps_processes"
tables["processParams"] = dbSchema + ".process_params"
tables["datasets"] = dbSchema + ".datasets"
tables["dataservers"] = dbSchema + ".dataservers"
tables["cities"] = dbSchema + ".cities"
tables["modconfigs"] = dbSchema + ".mod_configs"
############################################################
# Global vars
db_conn = update_cursor = serverCursor = None
city_crs = {}
############################################################
def upsert(cursor, params):
'''
Create a database row if one is needed
'''
table, column, server_id, proc_id = params
# This query will return the row's id if it finds a match, otherwise it will return nothing.
# We will check this with rowcount, below.
cursor.execute("UPDATE " + table + " SET alive = TRUE WHERE " + column + " = %s AND identifier = %s RETURNING id", (server_id, proc_id))
if(cursor.rowcount == 0):
cursor.execute("INSERT INTO " + table + " (" + column + ", identifier) VALUES (%s, %s)", (server_id, proc_id))
def convert_encoding(data, new_coding='UTF-8'):
'''
We get data from many different servers with different encodings. This function will attempt to convert
a string in data into a UTF-8 encoded string, which is what the database expects. This task can
be somewhat complex, possibly due to server misconfiguration.
'''
# First try encoding the data directly. This should always work, but fails with data from some servers in the wild.
try:
return data.encode(new_coding)
except:
# If that doesn't work, try a series of decoding and re-encodings. This should never be needed, but sometimes is.
codings = ["UTF-8", "latin1", "latin2", "latin3", "latin4", "latin5", "latin6", "latin7", "latin8", "latin9", "latin10", "ascii"]
for coding in codings:
try:
return unicode(data, coding).encode(new_coding)
except:
continue
print 'Could not find a unicode coding for string "' + data + '"'
# Return the string unaltered, and hope that the database doesn't choke
return data
def run_queries(conn, upsert_list, update_list):
'''
Run all the sql statements we've generated thus far. First the statements in upsert_list are run,
to ensure that all records are in place. Then update_list, which is where the real action is; each
is an update statement that acts on something previously
'''
conn.set_session(autocommit=False)
cursor = db_conn.cursor()
for params in upsert_list:
try:
upsert(cursor, params)
except Exception as e:
print "-----"
print "Error running upsert SQL:"
print "Params:", str(params)
print "-----"
print type(e)
print e.args
print str(e)
print "-----"
conn.rollback()
for sql in update_list:
try:
sql = convert_encoding(sql)
cursor.execute(sql)
conn.commit()
except Exception as e:
print "-----"
print "Error running update SQL:"
print sql
print "-----"
print type(e)
print e.args
print str(e)
print "-----"
conn.rollback()
conn.commit()
conn.set_session(autocommit=True)
def get_process_abstract(obj):
'''
Get the abstract of obj, and make sure we have a proper string if there is none
'''
if hasattr(obj, "abstract") and obj.abstract:
return obj.abstract
return ""
def get_process_datatype(obj):
'''
Get the datatype of obj, and make sure we have a proper string if there is none
'''
if hasattr(obj, "dataType") and obj.dataType:
return clean_datatype(obj.dataType)
return ""
def get_update_wps_param_sql(proc_id, identifier, title, abstract, datatype, is_input, minOccurs, maxOccurs):
return (
"UPDATE " + tables["processParams"] + " "
"SET title = " + str(adapt(title)) + ","
"abstract = " + str(adapt(abstract)) + ", "
"datatype = " + str(adapt(datatype)) + ", "
"is_input = " + str(adapt(is_input)) + ", "
"min_occurs = " + str(adapt(minOccurs)) + ", "
"max_occurs = " + str(adapt(maxOccurs)) + ", "
"alive = TRUE, "
"last_seen = NOW() "
"WHERE wps_process_id = " + str(adapt(proc_id)) + " "
"AND identifier = " + str(adapt(identifier))
)
def prepare_update_wps_param(procId, obj, is_input):
abstract = get_process_abstract(obj)
datatype = get_process_datatype(obj)
# Even though occurrences do no make sense for outputs, they must be inserted in the database.
minOcc = 1
maxOcc = 1
if is_input:
minOcc = obj.minOccurs
maxOcc = obj.maxOccurs
return get_update_wps_param_sql(procId, obj.identifier, obj.title, abstract, datatype, is_input, minOcc, maxOcc)
def prepare_update_wps_server_info(server_url, wps):
return (
"UPDATE " + tables["wpsServers"] + " "
"SET title = " + str(adapt(wps.identification.title)) + ", "
"abstract = " + str(adapt(wps.identification.abstract)) + ", "
"provider_name = " + str(adapt(wps.provider.name)) + ", "
"contact_name = " + str(adapt(wps.provider.contact.name)) + ", "
"contact_email = " + str(adapt(wps.provider.contact.email)) + ", "
"last_seen = NOW(), "
"alive = TRUE "
"WHERE url = " + str(adapt(server_url))
)
def prepare_update_wps_process(server_url, identifier, title, abstract):
# Note that we do some regex stuff below to fix a problem with adapt that doesn't quote certain
# combinations of unicode and single quotes. It's ugly. I can't help it. I'm sorry.
return (
"UPDATE " + tables["processes"] + " "
"SET title = " + re.sub("([^'])'([^'])", "\1''\2", str(adapt(title))) + ", "
"abstract = " + str(adapt(abstract)) + ", "
"last_seen = NOW(), "
"alive = TRUE " +
"WHERE wps_server_id IN ("
"SELECT id FROM " + tables["wpsServers"] + " "
"WHERE url = " + str(adapt(server_url)) + " "
")"
"AND identifier = " + str(adapt(identifier))
)
def prepare_select_processes(server_url, identifier):
return (
"SELECT id FROM " + tables["processes"] + " "
"WHERE wps_server_id IN ("
"SELECT id FROM " + tables["wpsServers"] + " "
"WHERE url = " + str(adapt(server_url)) + " "
")"
"AND identifier = " + str(adapt(identifier))
)
def clean_datatype(datatype):
'''
Strip extraneous prefix from datatype
'''
if datatype and datatype.startswith("//www.w3.org/TR/xmlschema-2/#"):
return datatype.replace("//www.w3.org/TR/xmlschema-2/#", "")
return datatype
def check_wps(serverCursor):
'''
Check all WPS services, and update the database accordingly
'''
# Get the server list, but ignore servers marked as deleted
serverCursor.execute("SELECT DISTINCT url FROM " + tables["wpsServers"])
upsert_list = []
sqlList = []
# Mark all our records as dead; we'll mark them as alive as we process them. Note that the database won't
# actually be udpated until we commit all our transactions at the end, so we'll never see this value
# for a server/process/input that is in fact alive.
sqlList.append("UPDATE " + tables["wpsServers"] + " SET alive = false")
sqlList.append("UPDATE " + tables["processes"] + " SET alive = false")
# We'll delete the parameter list completely; There is no benefit of keeping older, but now disused module
# parameters around... it just confuses things.
# If the parameters reappaear in the process in the future, they will be added back, and any values
# associated with them will be retained.
sqlList.append("DELETE FROM " + tables["processParams"])
for row in serverCursor:
server_url = row[0]
# Run a GetCapabilities query on the WPS server -- could fail if URL is bogus
try:
wps = WebProcessingService(server_url, version = wpsVersion)
except:
print "Could not load WPS data from url " + server_url
# If URL is bogus, will raise a URLError... but whatever... no errors are reoverable at this point
continue
# Update the server title and abstract
sqlList.append(prepare_update_wps_server_info(server_url, wps))
# Iterate over the processes available on this server
for proc in wps.processes:
abstract = get_process_abstract(proc)
sqlList.append(prepare_update_wps_process(server_url, proc.identifier, proc.title, abstract))
# Need to do this here so that the SELECT below will find a record if the upsert inserts... a little messy
run_queries(db_conn, upsert_list, sqlList)
upsert_list = []
sqlList = []
# Get all processes associated with server that match the specified identifier -- could be more than one
update_cursor.execute(prepare_select_processes(server_url, proc.identifier))
for procrow in update_cursor:
procId = procrow[0]
try:
procDescr = wps.describeprocess(proc.identifier) # Call to OWSLib
except:
print "Could not describe process ", proc.identifier, " on server ", server_url
for input in procDescr.dataInputs:
upsert_list.append((tables["processParams"], "wps_process_id", procId, input.identifier))
sqlList.append(prepare_update_wps_param(procId, input, True))
for output in procDescr.processOutputs:
upsert_list.append((tables["processParams"], "wps_process_id", procId, output.identifier))
sqlList.append(prepare_update_wps_param(procId, output, False))
# Run and commit WPS transactions
run_queries(db_conn, upsert_list, sqlList)
upsert_list = []
def simplify_crs(crs):
'''
Convert urn:ogc:def:crs:EPSG::28992 to EPSG:28992
'''
# First, replace the :: with a single :
crs = crs.replace('::', ':')
words = crs.split(':')
return words[len(words) - 2] + ":" + words[len(words) - 1]
def is_equal_crs(first, second):
'''
Compare whether two crs's are the same. We'll consider the following two strings equal:
urn:ogc:def:crs:EPSG::28992 <==> EPSG:28992
'''
return simplify_crs(first).lower() == simplify_crs(second).lower()
def get_dataset_title(wms, wfs, wcs):
'''
Get the title for this data service; if multiple services are defined, prioritize WMS
'''
return convert_encoding(wms and wms.identification.title or
wfs and wfs.identification.title or
wcs and wcs.identification.title or
"Unnamed server")
def get_dataset_abstract(wms, wfs, wcs):
'''
Get the abstract for this data service; if multiple services are defined, prioritize WMS
'''
return convert_encoding(wms and wms.identification.abstract or
wfs and wfs.identification.abstract or
wcs and wcs.identification.abstract or
"")
def prepare_set_datasets_not_alive(server_url):
return (
"UPDATE " + tables["datasets"] + " SET alive = false "
"WHERE EXISTS ( "
"SELECT * FROM " + tables["dataservers"] + " "
"WHERE dataservers.id = datasets.dataserver_id "
"AND dataservers.url = '" + server_url + "'"
")"
)
def prepare_set_dataservers_not_alive(server_url):
return (
"UPDATE " + tables["dataservers"] + " "
"SET alive = false "
"WHERE url = '" + server_url + "'"
)
def prepare_update_dataservers(server_url, title, abstract, wms, wfs, wcs):
return (
"UPDATE " + tables["dataservers"] + " "
"SET title = " + str(adapt(title)) + ", "
"abstract = " + str(adapt(abstract)) + ", "
"alive = TRUE, "
"last_seen = NOW(), "
"wms = " + str(adapt(True if wms else False)) + ", "
"wfs = " + str(adapt(True if wfs else False)) + ", "
"wcs = " + str(adapt(True if wcs else False)) + " "
"WHERE url = " + str(adapt(server_url))
)
def get_ows_objects(server_url):
'''
Try to create OWSLib objects for the specified server; if contact cannot be established, OWSLib
will throw an exception, which we'll use as a signal that that service does not exist. For the
moment, we don't really care why it failed, just that it did.
'''
try:
wms = WebMapService(server_url, version = wmsVersion)
except:
wms = None
try:
wfs = WebFeatureService(server_url, version = wfsVersion)
except:
wfs = None
try:
wcs = WebCoverageService(server_url, version = wcsVersion)
# If contents are empty this may mean the server does not support
# the select WCS version, try with the alternate.
if wcs.contents == None or len(wcs.contents) <= 0:
wcs = WebCoverageService(server_url, version = wcsVersionAlt)
except:
wcs = None
return wms, wfs, wcs
def get_service_title(obj, identifier):
return convert_encoding(obj.contents[identifier].title if obj.contents[identifier].title else identifier)
def get_service_abstract(obj, identifier):
return convert_encoding(obj.contents[identifier].abstract if obj.contents[identifier].abstract else "")
def get_image_resolution(describe_coverage_object):
gridOffsets = describe_coverage_object.xpath("//*[local-name() = 'GridOffsets']")
if len(gridOffsets) == 0:
return None, None
offsets = gridOffsets[0].text.split()
if len(offsets) == 2:
return abs(float(offsets[0])), abs(float(offsets[1]))
if len(offsets) == 4:
return abs(float(offsets[0])), abs(float(offsets[3]))
def get_target_crs(describe_coverage_object):
try:
for element in describe_coverage_object[0].iter("{http://www.opengis.net/wcs/1.1}GridBaseCRS"):
return element.text
for element in describe_coverage_object[0].iter("{http://www.opengis.net/wcs/1.1.1}GridBaseCRS"):
return element.text
except:
return None
return None
def get_bounding_box(describe_coverage_object, target_crs):
'''
Returns the WGS84 BBox
'''
try:
for element in describe_coverage_object[0].iter("{http://www.opengis.net/ows/1.1}WGS84BoundingBox"):
lower_corner = element.find("{http://www.opengis.net/ows/1.1}LowerCorner").text
upper_corner = element.find("{http://www.opengis.net/ows/1.1}UpperCorner").text
return str.split(lower_corner + " " + upper_corner)
except:
return (None, None, None, None)
return (None, None, None, None)
def get_supported_formats(describe_coverage_object):
'''
Returns list with supported formats.
Fails for MapServer (that apparently does not comply with the standard)
'''
ret = list()
try:
for element in describe_coverage_object[0].iter("{http://www.opengis.net/wcs/1.1.1}SupportedFormat"):
ret.append(element.text)
return ret
except:
return None
return None
def check_data_servers(serverCursor):
cursor = db_conn.cursor()
# Get the server list
serverCursor.execute("SELECT DISTINCT url FROM " + tables["dataservers"])
for row in serverCursor:
upsert_list = []
sqlList = []
server_url = row[0]
# Marking all datasets and dataservers as defunct; will mark non-defunct as we go
sqlList.append(prepare_set_datasets_not_alive(server_url))
sqlList.append(prepare_set_dataservers_not_alive(server_url))
wms, wfs, wcs = get_ows_objects(server_url)
if not (wms or wfs or wcs): # No data services available? Time to move on!
run_queries(db_conn, upsert_list, sqlList)
continue
title = get_dataset_title (wms, wfs, wcs)
abstract = get_dataset_abstract(wms, wfs, wcs)
# wms: ['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__getitem__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_buildMetadata', '_capabilities', '_getcapproperty', 'contents', 'exceptions', 'getOperationByName', 'getServiceXML', 'getcapabilities', 'getfeatureinfo', 'getmap', 'identification', 'items', 'operations', 'password', 'provider', 'url', 'username', 'version']
# wfs: ['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__getitem__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_buildMetadata', '_capabilities', 'contents', 'exceptions', 'getOperationByName', 'getcapabilities', 'getfeature', 'identification', 'items', 'log', 'operations', 'provider', 'url', 'version']
# wfs.contents: ['__class__', '__cmp__', '__contains__', '__delattr__', '__delitem__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', '__gt__', '__hash__', '__init__', '__iter__', '__le__', '__len__', '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setitem__', '__sizeof__', '__str__', '__subclasshook__', 'clear', 'copy', 'fromkeys', 'get', 'has_key', 'items', 'iteritems', 'iterkeys', 'itervalues', 'keys', 'pop', 'popitem', 'setdefault', 'update', 'values', 'viewitems', 'viewkeys', 'viewvalues']
# wcs: ['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__getitem__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_capabilities', '_describeCoverage', 'contents', 'cookies', 'getCoverage', 'getDescribeCoverage', 'getOperationByName', 'identification', 'items', 'log', 'operations', 'provider', 'setLogLevel', 'url', 'version']
# wcs.contents: ['__class__', '__delattr__', '__dict__', '__doc__', '__format__', '__getattribute__', '__hash__', '__init__', '__module__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_checkChildAndParent', '_elem', '_getGrid', '_getTimeLimits', '_getTimePositions', '_parent', '_service', 'abstract', 'boundingBox', 'boundingBoxWGS84', 'boundingboxes', 'crsOptions', 'description', 'grid', 'id', 'keywords', 'styles', 'supportedCRS', 'supportedFormats', 'timelimits', 'timepositions', 'title']
try:
sqlList.append(prepare_update_dataservers(server_url, title, abstract, wms, wfs, wcs))
sql = ( "SELECT d.id, d.identifier, d.city_id "
"FROM " + tables["datasets"] + " AS d "
"LEFT JOIN " + tables["dataservers"] + " AS ds ON d.dataserver_id = ds.id "
"WHERE ds.url = %s" )
cursor.execute(sql, (server_url,)) # Trailing comma required
for row in cursor:
dsid, identifier, cityId = row
title = abstract = service = None
bbox_left = bbox_bottom = bbox_right = bbox_top = None
target_crs = None
has_city_crs = False
# from lxml import etree
# if wms:
# print dir(wms)
# etree.dump(wms._capabilities)
if wfs and identifier in wfs.contents:
title = get_service_title (wfs, identifier)
abstract = get_service_abstract(wfs, identifier)
service = "WFS"
if wfs.contents[identifier].boundingBoxWGS84:
# For WFS 1.0, at least, the boundingBoxWGS84 is actually a local CRS bounding box
# For WFS 1.1.0 it is correctly a WGS84 bounding box
bb = wfs.contents[identifier].boundingBoxWGS84 # Looks like (91979.2, 436330.0, 92615.5, 437657.0)
bbox_left, bbox_bottom, bbox_right, bbox_top = bb
else: # No bounding box!
# Make sure this dataset is not used as the aoi for any configurations
sql = "UPDATE " + tables["modconfigs"] + " SET aoi = -1 WHERE aoi = %s"
update_cursor.execute(sql, (dsid,))
bbox_left = bbox_bottom = bbox_right = bbox_top = None
# Check if dataset is available in the city's local srs
for c in wfs.contents[identifier].crsOptions:
if is_equal_crs(c.id, city_crs[cityId]):
has_city_crs = True
break
if wcs and identifier in wcs.contents:
title = get_service_title (wcs, identifier)
abstract = get_service_abstract(wcs, identifier)
service = "WCS"
for c in wcs.contents[identifier].supportedCRS: # crsOptions is available here, but always empty; only exists for OOP
if is_equal_crs(c.id, city_crs[cityId]):
has_city_crs = True
break
try:
dc = wcs.getDescribeCoverage(identifier)
except:
print "Can't do DescribeCoverage for WCS dataset " + server_url + " >>> " + identifier
continue
# Check for error
errors = dc.xpath("//*[local-name() = 'ExceptionReport']")
if len(errors) > 0:
errorText = "No error message"
errorMsgs = dc.xpath("//*[local-name() = 'ExceptionText']")
if len(errorMsgs) > 0:
errorText = errorMsgs[0].text
print "Error with " + identifier + " on " + server_url + ": " + errorText
continue
resX, resY = get_image_resolution(dc)
if resX is None:
print "Can't find GridOffsets for WCS dataset " + server_url + " >>> " + identifier
continue
target_crs = get_target_crs(dc)
if target_crs is None:
print "Can't find GridBaseCRS for WCS dataset " + server_url + " >>> " + identifier
continue
if wcs.contents[identifier].boundingBoxWGS84:
bbox_left, bbox_bottom, bbox_right, bbox_top = wcs.contents[identifier].boundingBoxWGS84
else:
bbox_left, bbox_bottom, bbox_right, bbox_top = get_bounding_box(dc, target_crs)
if bbox_left is None:
print "Could not find a bbox for WCS dataset " + server_url + " >>> " + identifier
continue
formats = get_supported_formats(dc)
if (formats == None) or (len(formats) == 0):
formats = wcs.contents[identifier].supportedFormats
# All else being equal, we'd prefer to work with img datasets; second choice is tiff,
# otherwise, we'll just take what is offered first
if len(formats) == 0:
print "Cannot find valid image format for WCS dataset " + server_url + " >>> " + identifier
continue
if(len(formats[0]) == 0):
print "Cannot get a supported format for WCS dataset " + server_url + " >>> " + identifier
continue
if 'image/img' in formats:
img_format = 'image/img'
elif 'image/tiff' in formats:
img_format = 'image/tiff'
else:
img_format = formats
else: # No WCS
resX = resY = img_format = None
if wms and identifier in wms.contents:
title = get_service_title (wms, identifier)
abstract = get_service_abstract(wms, identifier)
if service is None: # Don't clobber a WFS or WCS service
service = "WMS"
if service: # Update the database with the layer info
sqlList.append( "UPDATE " + tables["datasets"] + " "
"SET title = " + str(adapt(title)) + ", "
"abstract = " + str(adapt(abstract)) + ", "
"alive = TRUE, "
"last_seen = NOW(), "
"local_srs = " + str(adapt(has_city_crs)) + ", "
"format = " + ("NULL" if img_format is None else str(adapt(img_format))) + ", "
"bbox_left = " + ("NULL" if bbox_left is None else str(adapt(bbox_left))) + ", "
"bbox_right = " + ("NULL" if bbox_right is None else str(adapt(bbox_right))) + ", "
"bbox_top = " + ("NULL" if bbox_top is None else str(adapt(bbox_top))) + ", "
"bbox_bottom = " + ("NULL" if bbox_bottom is None else str(adapt(bbox_bottom))) + ", "
"bbox_srs = " + ("NULL" if target_crs is None else str(adapt(simplify_crs(target_crs)))) + ", "
"resolution_x = " + ("NULL" if resX is None else str(adapt(resX))) + ", "
"resolution_y = " + ("NULL" if resY is None else str(adapt(resY))) + ", "
"service = " + str(adapt(service)) +
"WHERE id = " + str(adapt(dsid))
)
else:
print "Not found: " + identifier + " (on server " + server_url + ")"
except Exception as e:
print "Error scanning server " + server_url
print type(e)
print e.args
print e
print "-----"
print traceback.format_exc()
else:
# Run queries and commit dataset transactions
run_queries(db_conn, upsert_list, sqlList)
def main():
global db_conn, update_cursor, serverCursor, city_crs
# Get the database connection info
print "Starting Harvester of Sorrow ", datetime.datetime.fromtimestamp(time.time()).strftime('%Y-%m-%d %H:%M:%S')
# To the database
db_conn = psycopg2.connect(host = dbDatabase, database = dbName, user = dbUsername, password = dbPassword)
db_conn.set_client_encoding("UTF-8")
# Turn autocommit on to avoid locking our select statements
# set_session([isolation_level,] [readonly,] [deferrable,] [autocommit])
db_conn.set_session(autocommit=True)
serverCursor = db_conn.cursor() # For listing servers
update_cursor = db_conn.cursor() # For updating the database
# Build a list of native CRS's for the cities
# Creates:
# {2: 'urn:ogc:def:crs:EPSG::31370', 3: 'urn:ogc:def:crs:EPSG::31467', 4: 'urn:ogc:def:crs:EPSG::2154', 5: 'urn:ogc:def:crs:EPSG::28992'}
serverCursor.execute("SELECT id, srs FROM " + tables["cities"])
for row in serverCursor:
city_crs[row[0]] = row[1]
try:
check_wps(serverCursor)
check_data_servers(serverCursor)
except Exception as e:
print "-----"
print "Unexpected error!"
print type(e)
print e.args
print e
print "-----"
db_conn.rollback()
# Close all cursors/connections
try:
serverCursor.close()
except:
print "Error closing serverCursor"
try:
update_cursor.close()
except:
print "Error closing update_cursor"
try:
db_conn.close()
except:
print "Error closing db_conn!"
print "Done!"
if __name__ == '__main__':
main()