grass.pygrass.rpc package¶
Fast and exit-safe interface to PyGRASS Raster and Vector layer using multiprocessing
(C) 2015 by the GRASS Development Team This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.
- authors
Soeren Gebbert
-
class
grass.pygrass.rpc.
DataProvider
[source]¶ Bases:
grass.pygrass.rpc.base.RPCServerBase
Fast and exit-safe interface to PyGRASS data delivery functions
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get_raster_image_as_np
(name, mapset=None, extent=None, color='RGB')[source]¶ Return the attribute table of a vector map as dictionary.
See documentation of: pygrass.raster.raster2numpy_img
Usage:
>>> from grass.pygrass.rpc import DataProvider >>> import time >>> provider = DataProvider() >>> ret = provider.get_raster_image_as_np(name=test_raster_name) >>> len(ret) 64 >>> extent = { ... "north": 30, ... "south": 10, ... "east": 30, ... "west": 10, ... "rows": 2, ... "cols": 2, ... } >>> ret = provider.get_raster_image_as_np(name=test_raster_name, extent=extent) >>> len(ret) 16 >>> extent = {"rows": 3, "cols": 1} >>> ret = provider.get_raster_image_as_np(name=test_raster_name, extent=extent) >>> len(ret) 12 >>> extent = { ... "north": 100, ... "south": 10, ... "east": 30, ... "west": 10, ... "rows": 2, ... "cols": 2, ... } >>> ret = provider.get_raster_image_as_np(name=test_raster_name, extent=extent) >>> provider.stop() >>> time.sleep(1) >>> extent = {"rows": 3, "cols": 1} >>> ret = provider.get_raster_image_as_np(name=test_raster_name, extent=extent) >>> len(ret) 12 ..
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get_vector_features_as_wkb_list
(name, mapset=None, extent=None, feature_type='point', field=1)[source]¶ Return the features of a vector map as wkb list.
- Parameters
extent – A dictionary of {“north”:double, “south”:double, “east”:double, “west”:double}
feature_type – point, centroid, line, boundary or area
- See documentation: pygrass.vector.VectorTopo::features_to_wkb_list
pygrass.vector.VectorTopo::areas_to_wkb_list
Usage:
>>> from grass.pygrass.rpc import DataProvider >>> provider = DataProvider() >>> wkb = provider.get_vector_features_as_wkb_list( ... name=test_vector_name, extent=None, feature_type="point" ... ) >>> for entry in wkb: ... f_id, cat, string = entry ... print(f_id, cat, len(string)) ... 1 1 21 2 1 21 3 1 21 >>> extent = {"north": 6.6, "south": 5.5, "east": 14.5, "west": 13.5} >>> wkb = provider.get_vector_features_as_wkb_list( ... name=test_vector_name, extent=extent, feature_type="point" ... ) >>> for entry in wkb: ... f_id, cat, string = entry ... print(f_id, cat, len(string)) ... 3 1 21 >>> wkb = provider.get_vector_features_as_wkb_list( ... name=test_vector_name, extent=None, feature_type="line" ... ) >>> for entry in wkb: ... f_id, cat, string = entry ... print(f_id, cat, len(string)) ... 4 2 57 5 2 57 6 2 57 >>> wkb = provider.get_vector_features_as_wkb_list( ... name=test_vector_name, extent=None, feature_type="centroid" ... ) >>> for entry in wkb: ... f_id, cat, string = entry ... print(f_id, cat, len(string)) ... 19 3 21 18 3 21 20 3 21 21 3 21 >>> wkb = provider.get_vector_features_as_wkb_list( ... name=test_vector_name, extent=None, feature_type="area" ... ) >>> for entry in wkb: ... f_id, cat, string = entry ... print(f_id, cat, len(string)) ... 1 3 225 2 3 141 3 3 93 4 3 141 >>> wkb = provider.get_vector_features_as_wkb_list( ... name=test_vector_name, extent=None, feature_type="boundary" ... ) >>> for entry in wkb: ... f_id, cat, string = entry ... print(f_id, cat, len(string)) ... 10 None 41 7 None 41 8 None 41 9 None 41 11 None 89 12 None 41 14 None 41 13 None 41 17 None 41 15 None 41 16 None 41 >>> provider.stop() ..
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get_vector_table_as_dict
(name, mapset=None, where=None)[source]¶ Return the attribute table of a vector map as dictionary.
See documentation of: pygrass.vector.VectorTopo::table_to_dict
Usage:
>>> from grass.pygrass.rpc import DataProvider >>> provider = DataProvider() >>> ret = provider.get_vector_table_as_dict(name=test_vector_name) >>> ret["table"] {1: [1, 'point', 1.0], 2: [2, 'line', 2.0], 3: [3, 'centroid', 3.0]} >>> ret["columns"] Columns([('cat', 'INTEGER'), ('name', 'varchar(50)'), ('value', 'double precision')]) >>> ret = provider.get_vector_table_as_dict( ... name=test_vector_name, where="value > 1" ... ) >>> ret["table"] {2: [2, 'line', 2.0], 3: [3, 'centroid', 3.0]} >>> ret["columns"] Columns([('cat', 'INTEGER'), ('name', 'varchar(50)'), ('value', 'double precision')]) >>> provider.get_vector_table_as_dict(name="no_map", where="value > 1") >>> provider.stop() ..
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-
class
grass.pygrass.rpc.
RPCDefs
[source]¶ Bases:
object
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GET_RASTER_IMAGE_AS_NP
= 3¶
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GET_VECTOR_FEATURES_AS_WKB
= 2¶
-
GET_VECTOR_TABLE_AS_DICT
= 1¶
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G_FATAL_ERROR
= 14¶
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STOP
= 0¶
-
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grass.pygrass.rpc.
data_provider_server
(lock, conn)[source]¶ The PyGRASS data provider server designed to be a target for multiprocessing.Process
- Parameters
lock – A multiprocessing.Lock
conn – A multiprocessing.connection.Connection object obtained from multiprocessing.Pipe
Submodules¶
grass.pygrass.rpc.base module¶
Fast and exit-safe interface to PyGRASS Raster and Vector layer using multiprocessing
(C) 2015-2024 by the GRASS Development Team This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.
- authors
Soeren Gebbert
-
class
grass.pygrass.rpc.base.
RPCServerBase
[source]¶ Bases:
object
This is the base class for send and receive RPC server It uses a Pipe for IPC.
>>> import grass.script as gscript >>> from grass.pygrass.rpc.base import RPCServerBase >>> import time >>> provider = RPCServerBase()
>>> provider.is_server_alive() True
>>> provider.is_check_thread_alive() True
>>> provider.stop() >>> time.sleep(1) >>> provider.is_server_alive() False
>>> provider.is_check_thread_alive() False
>>> provider = RPCServerBase() >>> provider.is_server_alive() True >>> provider.is_check_thread_alive() True
Kill the server process with an exception, it should restart
>>> provider.client_conn.send([1]) >>> provider.is_server_alive() True
>>> provider.is_check_thread_alive() True
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safe_receive
(message)[source]¶ Receive the data and throw a FatalError exception in case the server process was killed and the pipe was closed by the checker thread
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