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Merge pull request #418 from OpenDroneMap/volume
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,117 @@ | ||
| import logging | ||
| import shutil | ||
| import tempfile | ||
| import subprocess | ||
| import os | ||
| import geojson | ||
|
|
||
| from string import Template | ||
|
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| from webodm import settings | ||
|
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| logger = logging.getLogger('app.logger') | ||
|
|
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| class GrassEngine: | ||
| def __init__(self): | ||
| self.grass_binary = shutil.which('grass7') or \ | ||
| shutil.which('grass72') or \ | ||
| shutil.which('grass74') or \ | ||
| shutil.which('grass76') | ||
|
|
||
| if self.grass_binary is None: | ||
| logger.warning("Could not find a GRASS 7 executable. GRASS scripts will not work.") | ||
| else: | ||
| logger.info("Initializing GRASS engine using {}".format(self.grass_binary)) | ||
|
|
||
| def create_context(self, serialized_context = {}): | ||
| if self.grass_binary is None: raise GrassEngineException("GRASS engine is unavailable") | ||
| return GrassContext(self.grass_binary, **serialized_context) | ||
|
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||
|
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| class GrassContext: | ||
| def __init__(self, grass_binary, tmpdir = None, template_args = {}, location = None): | ||
| self.grass_binary = grass_binary | ||
| if tmpdir is None: | ||
| tmpdir = os.path.basename(tempfile.mkdtemp('_grass_engine', dir=settings.MEDIA_TMP)) | ||
| self.tmpdir = tmpdir | ||
| self.template_args = template_args | ||
| self.location = location | ||
|
|
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| def get_cwd(self): | ||
| return os.path.join(settings.MEDIA_TMP, self.tmpdir) | ||
|
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| def add_file(self, filename, source, use_as_location=False): | ||
| param = os.path.splitext(filename)[0] # filename without extension | ||
|
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| dst_path = os.path.abspath(os.path.join(self.get_cwd(), filename)) | ||
| with open(dst_path, 'w') as f: | ||
| f.write(source) | ||
| self.template_args[param] = dst_path | ||
|
|
||
| if use_as_location: | ||
| self.set_location(self.template_args[param]) | ||
|
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| return dst_path | ||
|
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| def add_param(self, param, value): | ||
| self.template_args[param] = value | ||
|
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| def set_location(self, location): | ||
| """ | ||
| :param location: either a "epsg:XXXXX" string or a path to a geospatial file defining the location | ||
| """ | ||
| if not location.startswith('epsg:'): | ||
| location = os.path.abspath(location) | ||
| self.location = location | ||
|
|
||
| def execute(self, script): | ||
| """ | ||
| :param script: path to .grass script | ||
| :return: script output | ||
| """ | ||
| if self.location is None: raise GrassEngineException("Location is not set") | ||
|
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| script = os.path.abspath(script) | ||
|
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| # Create grass script via template substitution | ||
| try: | ||
| with open(script) as f: | ||
| script_content = f.read() | ||
| except FileNotFoundError: | ||
| raise GrassEngineException("Script does not exist: {}".format(script)) | ||
|
|
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| tmpl = Template(script_content) | ||
|
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| # Write script to disk | ||
| with open(os.path.join(self.get_cwd(), 'script.sh'), 'w') as f: | ||
| f.write(tmpl.substitute(self.template_args)) | ||
|
|
||
| # Execute it | ||
| p = subprocess.Popen([self.grass_binary, '-c', self.location, 'location', '--exec', 'sh', 'script.sh'], | ||
| cwd=self.get_cwd(), stdout=subprocess.PIPE, stderr=subprocess.PIPE) | ||
| out, err = p.communicate() | ||
|
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||
| out = out.decode('utf-8').strip() | ||
| err = err.decode('utf-8').strip() | ||
|
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| if p.returncode == 0: | ||
| return out | ||
| else: | ||
| raise GrassEngineException("Could not execute GRASS script {} from {}: {}".format(script, self.get_cwd(), err)) | ||
|
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||
| def serialize(self): | ||
| return { | ||
| 'tmpdir': self.tmpdir, | ||
| 'template_args': self.template_args, | ||
| 'location': self.location | ||
| } | ||
|
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| def __del__(self): | ||
| # Cleanup | ||
| if os.path.exists(self.get_cwd()): | ||
| shutil.rmtree(self.get_cwd()) | ||
|
|
||
| class GrassEngineException(Exception): | ||
| pass | ||
|
|
||
| grass = GrassEngine() |
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