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Grass.py
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Grass.py
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"""
Module is here for work with GRASS GIS environmental variables and
locations and mapsets
"""
# Author: Jachym Cepicky
# http://les-ejk.cz
# License:
#
# Web Processing Service implementation
# Copyright (C) 2006 Jachym Cepicky
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
import os
import time, shutil, tempfile
import sys
from pywps import config
import logging
class Grass:
""" GRASS initialization interface """
locationDir = ""
locationName = ""
mapsetDir = ""
mapsetName = ""
gisbase = ""
def __init__(self,executeRequest):
""" Initialization of GRASS environmental variables (except GISRC). """
self.executeRequest = executeRequest
self.wps = self.executeRequest.wps
self.envs = {
"path":"PATH",
"addonPath":"GRASS_ADDON_PATH",
"version":"GRASS_VERSION",
"gui":"GRASS_GUI",
"gisbase": "GISBASE",
"ldLibraryPath": "LD_LIBRARY_PATH",
"home": "HOME",
"pythonpath":"PYTHONPATH"
}
# put env
for key in self.envs.keys():
try:
self.setEnv(self.envs[key],config.getConfigValue("grass",key))
logging.info("GRASS environment variable %s set to %s" %\
(key, config.getConfigValue("grass",key)))
except :
logging.info("GRASS environment variable %s set to %s" %\
(key, self.envs[key]))
pass
# GIS_LOCK
self.setEnv('GIS_LOCK', str(os.getpid()))
logging.info("GRASS GIS_LOCK set to %s" % str(os.getpid()))
def mkMapset(self,location=None):
"""
Create GRASS mapset in current directory. Mapsets name is 'mapset'.
At the end, GRASS will believe, it has run correctly.
Returns name of new created mapset. location!=None, this mapset
should be deleted!
Arguments:
location - Should the new mapset be created in the some old
location, which is already on this server?
Default: only mapset within
/tmp/grasstmpSOMEHTIN/
will be created
"""
if location == None:
self.locationDir = self.executeRequest.workingDir
self.mapsetDir = tempfile.mkdtemp(prefix="pywps",dir=self.locationDir)
self.mapsetName = os.path.split(self.mapsetDir)[1]
self.locationName = os.path.split(self.locationDir)[1]
# create new WIND file
self._windFile(self.mapsetName)
# create mapset PERMANENT
os.mkdir("PERMANENT")
self._windFile("PERMANENT")
self.gisdbase = os.path.split(os.path.abspath(os.path.curdir))[0]
# location is here, we justhave to use it
else:
self.locationDir = os.path.join(config.getConfigValue("grass","gisdbase"), location)
self.mapsetDir = tempfile.mkdtemp(prefix="pywps",dir=self.locationDir)
self.mapsetName = os.path.split(self.mapsetDir)[1]
self.locationName = os.path.split(location)[-1]
self.executeRequest.dirsToBeRemoved.append(os.path.abspath(self.mapsetDir))
# copy
shutil.copy(os.path.join(
self.locationDir,"PERMANENT","DEFAULT_WIND"),
os.path.join(self.mapsetDir,"WIND"))
# export env. vars
(self.gisdbase,location) = os.path.split(self.locationDir)
# GRASS creates a temp dir for the display driver.
# Add it to dirsToBeRemoved
try:
grassTmpDir = os.path.join(tempfile.gettempdir(),
"grass"+config.getConfigValue("grass","version")[:1]+\
"-"+os.getenv("USERNAME")+\
"-"+str(os.getpid()))
self.executeRequest.dirsToBeRemoved.append(grassTmpDir)
except :
pass
self.setEnv('MAPSET', self.mapsetName)
self.setEnv('LOCATION_NAME',self.locationName)
self.setEnv('GISDBASE', self.gisdbase)
# gisrc
gisrc = open(os.path.join(self.executeRequest.workingDir,"grassrc"),"w")
gisrc.write("LOCATION_NAME: %s\n" % self.locationName)
gisrc.write("MAPSET: %s\n" % self.mapsetName)
gisrc.write("DIGITIZER: none\n")
gisrc.write("GISDBASE: %s\n" % self.gisdbase)
gisrc.write("OVERWRITE: 1\n")
gisrc.write("GRASS_GUI: text\n")
gisrc.close()
logging.info("GRASS MAPSET set to %s" % self.mapsetName)
logging.info("GRASS LOCATION_NAME set to %s" % self.locationName)
logging.info("GRASS GISDBASE set to %s" % self.gisdbase)
self.setEnv("GISRC",os.path.join(self.executeRequest.workingDir,"grassrc"))
logging.info("GRASS GISRC set to %s" % os.path.join(self.executeRequest.workingDir,"grassrc"))
return self.mapsetName
def _windFile(self,mapset):
""" Create default WIND file """
if mapset == "PERMANENT":
windname = "DEFAULT_WIND"
else:
windname = "WIND"
wind =open(
os.path.join(
os.path.abspath(self.executeRequest.workingDir),mapset,windname),"w")
wind.write("""proj: 0\n""")
wind.write("""zone: 0\n""")
wind.write("""north: 1000\n""")
wind.write("""south: 0\n""")
wind.write("""east: 1000\n""")
wind.write("""west: 0\n""")
wind.write("""cols: 1000\n""")
wind.write("""rows: 1000\n""")
wind.write("""e-w resol: 1\n""")
wind.write("""n-s resol: 1\n""")
wind.close()
return
def setEnv(self, key, value):
"""Set GRASS environmental variables """
os.putenv(key, value)
os.environ[key] = value
if key == 'GISBASE':
sys.path.append(os.path.join(value, 'etc', 'python'))