File: qgis_grass_test.py

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#!/usr/bin/python2.7
# -*- coding: utf-8 -*-
#-----------------------------------------------------------
#
# Copyright (C) 2012  Radim Blazek
# EMAIL: radim.blazek (at) gmail.com
#
#-----------------------------------------------------------
#
# licensed under the terms of GNU GPL 2
#
# 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.
#
#---------------------------------------------------------------------

"""
***************************************************************************
 GRASS Direct test - to be run in GRASS shell

 - collects list of raster layers
 - exports GRASS layers on low resolution to temporary GeoTIFFs
 - runs GRASS modules in standard and direct mode and compares results
 - writes out report
***************************************************************************
"""
__author__ = 'Radim Blazek'
__date__ = 'December 2012'
__copyright__ = '(C) 2012, Radim Blazek'
__revision__ = '$Format:%H$'

import os, sys, glob, subprocess, time, re

class Test:
  def __init__(self):
    if not os.environ.has_key("GISBASE") or not os.environ.has_key("GISRC"):
      print "This script must be run in GRASS shell."
      sys.exit ( 1 )

    if not os.environ.has_key("QGIS_PREFIX_PATH"):
      print "QGIS_PREFIX_PATH environment variable not set."
      sys.exit ( 1 )

    self.size = 10
    self.reportStr = ""
    pass

  # add message to HTML report
  def report( self, msg ):
    self.reportStr += msg + "\n"

  def writeReport( self ):
    print self.reportStr

  def test(self):
    print "GRASS Direct test"



    tmp_dir = os.path.abspath( "qgis-grass-test-%s" % time.strftime('%y%m%d-%H%M%S') )
    tmp_dir = os.path.abspath( "qgis-grass-test-debug" ) # debug
    print "Output will be written to %s" % tmp_dir

    files_dir = "%s/tif" % tmp_dir
    #os.makedirs( files_dir )

    # get list of raster layers
    print "Getting list of rasters ..."
    rasters = self.srun( ["g.mlist", "type=rast"] ).splitlines()
    max_rasters = 1
    print "%s rasters found, using first %s" % ( len( rasters), max_rasters )
    rasters = rasters[0:1]

    print "Exporting rasters"
    for raster in rasters:
      print raster
      output = "%s/%s.tif" % ( files_dir, raster )
      self.srun( ["g.region", "rast=%s" % raster, "cols=%s" % self.size, "rows=%s" % self.size ] )
      self.srun( ["r.out.gdal", "input=%s" % raster, "output=%s" % output] )

    # run modules
    count = 0
    for module in self.modules():
      for raster in rasters:
        module = re.sub("  *", " ", module )
        module_name = module.split(" ")[0]
        # --- native ---
        self.srun( ["g.region", "rast=%s" % raster, "cols=%s" % self.size, "rows=%s" % self.size ] )
        output = "qgistest1"
        # clean old
        self.srun( ["g.remove", "-f", "rast=%s" % output ] )
        # substitute rasters
        native_args = module.replace("R1",raster).replace("RO1",output).split(" ");
        (code, out, err) = self.run( native_args )
        if code != 0:
          self.report( "Native failed: %s" % " ".join(native_args) )
        # export
        native_output_file = "%s/%s-%s-native.tif" % ( files_dir, module_name, raster )
        self.srun( ["r.out.gdal", "input=%s" % output, "output=%s" % native_output_file] )
        self.srun( ["g.remove", "-f", "rast=%s" % output ] )

        # --- direct ---
        direct_input_file = "%s/%s.tif" % ( files_dir, raster )
        direct_output_file = "%s/%s-%s-direct.tif" % ( files_dir, module_name, raster )

        # substitute rasters
        direct_args = module.replace("R1",direct_input_file).replace("RO1",direct_output_file).split(" ");
        env = os.environ

        # CRS
        proj = self.srun( ["g.proj", "-j"] )
        longlat = True if proj.find("+proj=longlat") != -1 else False
        proj = proj.splitlines()
        proj =  " ".join ( proj )
        print proj
        env['QGIS_GRASS_CRS'] =  proj

        # set GRASS region as environment variable
        reg = self.srun( ["g.region", "-g"] )
        reg_dict = dict(item.split("=") for item in reg.splitlines())
        reg_var= { 'n': 'north', 's': 'south', 'e': 'east', 'w':'west', 'nsres': 'n-s resol', 'ewres': 'e-w resol' }
        if longlat:
          region = "proj:3;zone:-1" # longlat
        else:
          region = "proj:99;zone:-1" # other projection
        for k,v  in reg_dict.iteritems():
          if k == 'cells': continue
          kn = k
          if reg_var.has_key( k ) : kn = reg_var[k]
          region += ";%s:%s" % ( kn, v )
        print region
        env['GRASS_REGION'] = region

        # add path to fake GRASS gis library
        env['LD_LIBRARY_PATH'] = "%s/lib/qgis/plugins/:%s" % (env['QGIS_PREFIX_PATH'], env['LD_LIBRARY_PATH'] )
        (code, out, err) = self.run( direct_args, env )
        print "code = %s" % code
        if code != 0:
          self.report( "Direct failed: %s\n%s\n%s" % (" ".join(direct_args), out, err) )
        # TODO: compare native x direct output

  def run( self, args, env=None, input = None, exit_on_error = False ):
    cmd = " ".join(args)
    print cmd
    p = subprocess.Popen( args, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, env=env)
    com = p.communicate( input )
    p.wait()

    if p.returncode != 0 and exit_on_error:
      msg = "Failed:\n" + str(com[0]) + "\n" + str(com[1])
      raise Exception( msg )

    return (p.returncode, com[0], com[1] ) # return stdout

  # simple run
  def srun( self, args ):
    return self.run(args, None, None, True)[1]

  def modules(self ):
    # R1 - input raster 1
    # RO1 - output raster 1
    modules = [
      "r.slope.aspect elevation=R1 aspect=RO1"
    ]
    return modules

if __name__ == '__main__':
  test = Test()
  test.test()
  test.writeReport()