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versioning.py
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versioning.py
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"""
/***************************************************************************
versioning
A QGIS plugin
postgis database versioning
-------------------
begin : 2013-12-04
copyright : (C) 2013 by Oslandia
email : infos@oslandia.com
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
"""
#from PyQt4.QtCore import QAction
from PyQt4.QtGui import QAction, QDialog, QDialogButtonBox, \
QFileDialog, QIcon, QLabel, QLineEdit, QMessageBox, QTableWidget, \
QTreeView, QTreeWidget, QVBoxLayout, QTableWidgetItem, QColor, QProgressBar,\
QCheckBox, QComboBox, QDesktopServices
from qgis.core import QgsCredentials, QgsDataSourceURI, QgsMapLayerRegistry, \
QgsFeatureRequest, QGis, QgsFeature, QgsGeometry, QgsPoint, QgsSymbolV2, \
QgsRuleBasedRendererV2
from PyQt4.QtCore import *
from qgis.gui import QgsMessageBar
from qgis.utils import showPluginHelp
import re
import os
import os.path
import psycopg2
from PyQt4 import uic
import versioning_base
import platform, sys
# Deactivate stdout (like output of print statements) because windows
# causes occasional "IOError [Errno 9] File descriptor error"
# Not needed when there is a way to run QGIS in console mode in Windows.
iswin = any(platform.win32_ver())
if iswin:
sys.stdout = open(os.devnull, 'w')
# We start from layers coming from one or more postgis non-versioned schemata
# A widget group is displayed for each distinct schema
# (identified with 'dbname schema')
# The widget group contains a branch and version combobox extracted from layers
# You can only checkout head revision
# If you select a new branch, you have to enter the name and it will be
# created from either the current working copy or the current branch/rev
# If you select a revision, the corresponding view in the db will be
# created and the layers replaced
# The list of postgres connections can be found either in layers,
# or in working copy
# The list of working copies can be found either in layers or in filesystem
# BRANCHES have no underscore, no spaces
class Versioning:
"""Versioning postgis DB in QGIS"""
def __init__(self, iface):
# Save reference to the QGIS interface
self.iface = iface
# initialize plugin directory
self.plugin_dir = os.path.dirname(__file__)
self.q_commit_msg_dlg = QDialog(self.iface.mainWindow())
self.q_commit_msg_dlg = uic.loadUi(self.plugin_dir+"/commit_msg.ui")
self.commit_msg_dlg = ""
self.q_view_dlg = QDialog(self.iface.mainWindow())
self.q_view_dlg = uic.loadUi(self.plugin_dir+"/revision_dialog.ui")
self.current_layers = []
self.actions = []
self._pg_conn_info = ''
self.current_group_idx = -1
self.info = QLabel()
# this is not really nice since this is hidden in the interface
# but nothing else is available to get a selected group in the legend
self.legend = self.iface.mainWindow().findChild( QTreeWidget,
'theMapLegend' )
if self.legend: # qgis 2.2
self.legend.itemClicked.connect(self.on_legend_click)
self.legend.itemChanged.connect(self.on_legend_click)
else: # qgis 2.4
self.legend = self.iface.mainWindow().findChild( QTreeView, 'theLayerTreeView')
self.legend.clicked.connect(self.on_legend_click)
def enable_diffmode(self):
'''This function enables the diffmode checkbox iif the number of checked
revision == 2. The reason is that we want to apply diff styles to
features only between two revisions. When the checkbox is enabled, users
can check it. If it was checked at one point and the number of selected
revisions != 2, then it is unchecked and disabled.
Intended use in : versioning.view
'''
#print "in enable_diffmode"
nb_checked_revs = 0
for i in range(self.q_view_dlg.tblw.rowCount()):
# check if tblw.item(0,0) is not None (bug with Qt slots ?)
if self.q_view_dlg.tblw.item(0,0) :
if self.q_view_dlg.tblw.item(i,0).checkState():
nb_checked_revs += 1
else:
return
if nb_checked_revs == 2:
self.q_view_dlg.diffmode_chk.setEnabled(True)
else :
self.q_view_dlg.diffmode_chk.setCheckState(Qt.Unchecked)
self.q_view_dlg.diffmode_chk.setEnabled(False)
def check_branches(self):
''' In the comparison mode (diffmode), only two revisions are compared.
Both revisions must be on the same branch for comparison to happen. If
that is not the case, branch names of the revision items are highlighted.
'''
#print "in check_branches"
if self.q_view_dlg.diffmode_chk.isChecked():
#print "Checkbox is checked"
branches = []
indexes = []
for i in range(self.q_view_dlg.tblw.rowCount()):
if self.q_view_dlg.tblw.item(i,0).checkState():
branches.append(self.q_view_dlg.tblw.item(i,3).text())
indexes.append(i)
#print "Compared branches are " + branches[0] + ", " + branches[1]
if branches[0] != branches[1]:
print "Branches are not equal"
self.q_view_dlg.diffmode_chk.setCheckState(Qt.Unchecked)
self.iface.messageBar().pushMessage("Warning",
"Selected revisions cannot be compared because they are not on "
"the same branch.", level=QgsMessageBar.WARNING, duration=5)
# Highlight branch items in table
# Ideally, find a way to temporarily highlight
self.q_view_dlg.tblw.item(indexes[0],3).setBackground (QColor(255,255,0))
self.q_view_dlg.tblw.item(indexes[1],3).setBackground (QColor(255,255,0))
return
def mem_layer_uri(self, pg_layer):
'''Final string concatenation to get a proper memory layer uri. Example:
"Point?crs=epsg:4326&field=id:integer&field=name:string(20)&index=yes"
Geometry identifiers supported in memory layers :
Point, LineString, Polygon, MultiPoint, MultiLineString, MultiPolygon
Intended use in : versioning.view
'''
mem_uri = 'Unknown'
srid = str(QgsDataSourceURI(pg_layer.source()).srid())
if pg_layer.wkbType() == QGis.WKBPoint:
#print "Layer \"" + pg_layer.name()+ "\" is a point layer"
mem_uri = "Point?crs=epsg:" + srid +"&" + versioning_base.mem_field_names_types(pg_layer) + "&index=yes"
if pg_layer.wkbType()==QGis.WKBLineString:
#print "Layer \"" + pg_layer.name()+ "\" is a linestring layer"
mem_uri = "LineString?crs=epsg:" + srid +"&" + versioning_base.mem_field_names_types(pg_layer) + "&index=yes"
if pg_layer.wkbType() == QGis.WKBPolygon:
#print "Layer \"" + pg_layer.name()+ "\" is a polygon layer"
mem_uri = "Polygon?crs=epsg:" + srid +"&" + versioning_base.mem_field_names_types(pg_layer) + "&index=yes"
if pg_layer.wkbType() == QGis.WKBMultiPoint:
#print "Layer \"" + pg_layer.name()+ "\" is a multi-point layer"
mem_uri = "MultiPoint?crs=epsg:" + srid +"&" + versioning_base.mem_field_names_types(pg_layer) + "&index=yes"
if pg_layer.wkbType()==QGis.WKBMultiLineString:
#print "Layer \"" + pg_layer.name()+ "\" is a multi-linestring layer"
mem_uri = "MultiLineString?crs=epsg:" + srid +"&" + versioning_base.mem_field_names_types(pg_layer) + "&index=yes"
if pg_layer.wkbType()==QGis.WKBMultiPolygon:
#print "Layer \"" + pg_layer.name()+ "\" is a multi-polygon layer"
mem_uri = "MultiPolygon?crs=epsg:" + srid +"&" + versioning_base.mem_field_names_types(pg_layer) + "&index=yes"
return mem_uri
def pg_conn_info(self):
"""returns current postgis versioned DB connection info
request credentials if needed"""
if not self._pg_conn_info:
# In the simple case: all pg layers share the same conn info
# we set the conn info, if not, we ask for a connection
# We then request credentials if necessary
conn_info = ''
for layer in self.iface.legendInterface().layers():
if layer.providerType() == "postgres":
cni = QgsDataSourceURI(layer.source()).connectionInfo()
if not conn_info:
conn_info = cni
elif conn_info != cni:
conn_info = 'heterogeneous'
if conn_info == 'heterogeneous':
assert(False) # TODO request connection
uri = QgsDataSourceURI( conn_info )
conn = None
try:
conn = psycopg2.connect(conn_info)
except:
conn = None
if not conn:
#print "Case when the pass/user are not saved in the project"
(success, user, passwd ) = QgsCredentials.instance().get(
conn_info, None, None )
if success:
QgsCredentials.instance().put( conn_info, user, passwd )
uri.setPassword(passwd)
uri.setUsername(user)
self._pg_conn_info = uri.connectionInfo()
return self._pg_conn_info
def get_pg_users_list(self):
#get list of pg users to populate combobox used in commit msg dialog
pg_users_list = versioning_base.get_pg_users_list(self.pg_conn_info())
#print "pg_users_list = " + str(pg_users_list)
self.q_commit_msg_dlg.pg_users_combobox.addItems (pg_users_list)
def on_legend_click(self, current, column=0):
"changes menu when user clicks on legend"
self.current_group_idx = -1
name = ''
self.current_layers = []
self.info.setText('Versioning : no group selected')
for act in self.actions:
if act.text() in ['checkout',
'update',
'commit',
'view',
'branch',
'historize' ]:
act.setVisible(False)
if current:
try: # qgis 2.2
name = current.text(0)
except: #qgis 2.4
name = current.data()
# we could look if we have something in selected layers
# but we prefer impose grouping, otherwise it'll be easy to make errors
# need to get all layers including subgroups
rel_map = {}
for grp, lay in self.iface.legendInterface().groupLayerRelationship():
rel_map[grp] = lay
if not name or name not in rel_map: # not a group
return
# if group is empty
if not(rel_map[name]):
self.info.setText('Versioning : empty group')
return
group_idx = [i for i, x in
enumerate(self.iface.legendInterface().groups()) if x == name]
if len(group_idx) != 1:
self.info.setText("Versioning : more than one group with this name")
self.current_layers = []
return
[self.current_group_idx] = group_idx
replaced = True
while replaced:
replaced = False
for i, item in enumerate(rel_map[name]):
if item in rel_map:
rel_map[name][i:i+1] = rel_map[item]
replaced = True
self.current_layers = rel_map[name]
# we should check that the selection is homogeneous
previous_conn = ()
for layer_id in self.current_layers:
layer = QgsMapLayerRegistry.instance().mapLayer( layer_id )
uri = QgsDataSourceURI(layer.source())
if previous_conn:
if (uri.database(), uri.schema()) != previous_conn:
self.current_layers = []
self.info.setText("Versioning : layers don't share db and schema")
return
else:
previous_conn = (uri.database(), uri.schema())
if not self.current_layers:
return
if not len(previous_conn[0]):
self.current_layers = []
self.info.setText("Versioning : not versionable")
return
layer = QgsMapLayerRegistry.instance().mapLayer(
self.current_layers[0] )
uri = QgsDataSourceURI( layer.source() )
selection_type = ''
if layer.providerType() == "spatialite":
rev = 0
try:
rev = versioning_base.revision( uri.database() )
except:
self.current_layers = []
self.info.setText("Versioning : the selected group is not a working copy")
return
# We can split on "/" irrespective of OS because QgsDataSourceURI
# normalises the path separator to "/"
self.info.setText( uri.database().split("/")[-1] +' <b>working rev</b>='+str(rev))
selection_type = 'working copy'
if layer.providerType() == "postgres":
mtch = re.match(r'(.+)_([^_]+)_rev_(head|\d+)', uri.schema())
if mtch:
self.info.setText(uri.database()+' '+mtch.group(1)
+' branch='+mtch.group(2)+' rev='+mtch.group(3))
if mtch.group(3) == 'head':
selection_type = 'head'
else:
selection_type = 'versioned'
else:
# check if it's a working copy
rev = 0
try:
rev = versioning_base.pg_revision( self.pg_conn_info(),
uri.schema() )
selection_type = 'working copy'
self.info.setText( uri.database()+' '+uri.schema()
+' <b>working rev</b>='+str(rev) )
except:
self.info.setText('Versioning : unversioned schema')
selection_type = 'unversioned'
# refresh the available commands
assert( selection_type )
if selection_type == 'unversioned':
for act in self.actions:
if act.text() == 'historize':
act.setVisible(True)
elif selection_type == 'versioned':
for act in self.actions:
if act.text() in ['view', 'branch']:
act.setVisible(True)
elif selection_type == 'head':
for act in self.actions:
if act.text() in ['checkout', 'view', 'branch']:
act.setVisible(True)
elif selection_type == 'working copy':
for act in self.actions:
if act.text() in ['update', 'commit']:
act.setVisible(True)
def initGui(self):
"""Called once QGIS gui is loaded, before project is loaded"""
self.info.setText('Versioning : no group selected')
self.actions.append( self.iface.addToolBarWidget( self.info ) )
# we could have a checkbox to either replace/add layers
self.actions.append( QAction(
QIcon(os.path.dirname(__file__) + "/historize.svg"),
u"historize", self.iface.mainWindow()) )
self.actions[-1].setWhatsThis("historize")
self.actions[-1].triggered.connect(self.historize)
self.actions[-1].setVisible(False)
self.actions.append( QAction(
QIcon(os.path.dirname(__file__) + "/checkout.svg"),
u"checkout", self.iface.mainWindow()) )
self.actions[-1].setToolTip ("spatialite checkout")
self.actions[-1].setWhatsThis("checkout")
self.actions[-1].triggered.connect(self.checkout)
self.actions[-1].setVisible(False)
self.actions.append( QAction(
QIcon(os.path.dirname(__file__) + "/checkout_pg.svg"),
u"checkout", self.iface.mainWindow()) )
self.actions[-1].setToolTip ("postGIS checkout")
self.actions[-1].setWhatsThis("checkout postgres")
self.actions[-1].triggered.connect(self.checkout_pg)
self.actions[-1].setVisible(False)
self.actions.append( QAction(
QIcon(os.path.dirname(__file__) + "/update.svg"),
u"update", self.iface.mainWindow()) )
self.actions[-1].setWhatsThis("update working copy")
self.actions[-1].triggered.connect(self.update)
self.actions[-1].setVisible(False)
self.actions.append( QAction(
QIcon(os.path.dirname(__file__) + "/commit.svg"),
u"commit", self.iface.mainWindow()) )
self.actions[-1].setWhatsThis("commit modifications")
self.actions[-1].triggered.connect(self.commit)
self.actions[-1].setVisible(False)
self.actions.append( QAction(
QIcon(os.path.dirname(__file__) + "/view.svg"),
u"view", self.iface.mainWindow()) )
self.actions[-1].setWhatsThis("see revision")
self.actions[-1].triggered.connect(self.view)
self.actions[-1].setVisible(False)
self.actions.append( QAction(
QIcon(os.path.dirname(__file__) + "/branch.svg"),
u"branch", self.iface.mainWindow()) )
self.actions[-1].setWhatsThis("create branch")
self.actions[-1].triggered.connect(self.branch)
self.actions[-1].setVisible(False)
self.actions.append( QAction(
QIcon(os.path.dirname(__file__) + "/help.svg"),
u"help", self.iface.mainWindow()) )
self.actions[-1].setWhatsThis("versioning-help")
self.actions[-1].setToolTip ("versioning help")
url = "http://qgis-versioning.readthedocs.org/en/latest/"
self.actions[-1].triggered.connect(lambda:QDesktopServices.openUrl(QUrl(url)))
self.actions[-1].setVisible(True)
# add actions in menus
for act in self.actions:
self.iface.addToolBarIcon(act)
def unload(self):
"""called when plugin is unloaded"""
# Remove the plugin menu item and icon
for act in self.actions:
self.iface.removeToolBarIcon(act)
try: # qgis 2.2
self.legend.itemClicked.disconnect(self.on_legend_click)
self.legend.itemChanged.disconnect(self.on_legend_click)
except: # qgis 2.4
self.legend.clicked.disconnect(self.on_legend_click)
def branch(self):
"""create branch and import layers"""
layer = QgsMapLayerRegistry.instance().mapLayer(
self.current_layers[0] )
uri = QgsDataSourceURI(layer.source())
mtch = re.match(r'(.+)_([^_]+)_rev_(head|\d+)', uri.schema())
schema = mtch.group(1)
base_branch = mtch.group(2)
base_rev = mtch.group(3)
assert(schema)
dlg = QDialog()
dlg.setWindowTitle('Enter branch name')
layout = QVBoxLayout(dlg)
button_box = QDialogButtonBox(dlg)
button_box.setStandardButtons(
QDialogButtonBox.Cancel|QDialogButtonBox.Ok)
button_box.accepted.connect(dlg.accept)
button_box.rejected.connect(dlg.reject)
line_edit = QLineEdit( dlg )
layout.addWidget( line_edit )
layout.addWidget( button_box )
if not dlg.exec_() :
return
branch = line_edit.text()
if not branch:
print 'aborted'
return
pcur = versioning_base.Db( psycopg2.connect(self.pg_conn_info()) )
pcur.execute("SELECT * FROM "+schema+".revisions "
"WHERE branch = '"+branch+"'")
if pcur.fetchone():
pcur.close()
QMessageBox.warning( self.iface.mainWindow(), "Warning",
"Branch "+branch+' already exists.')
return
pcur.close()
# get the commit message
# get rid of the combobox asking for the pg username of committer
self.q_commit_msg_dlg.pg_users_combobox.setVisible(False)
self.q_commit_msg_dlg.pg_username_label.setVisible(False)
if not self.q_commit_msg_dlg.exec_():
return
commit_msg = self.q_commit_msg_dlg.commitMessage.document().toPlainText()
if not commit_msg:
QMessageBox.warning(self.iface.mainWindow(), "Warning",
"No commit message, aborting commit")
print "aborted"
return
versioning_base.add_branch( uri.connectionInfo(),
schema, branch, commit_msg, base_branch, base_rev )
grp_name = branch+' revision head'
grp_idx = self.iface.legendInterface().addGroup( grp_name )
for layer_id in reversed(self.current_layers):
layer = QgsMapLayerRegistry.instance().mapLayer(layer_id)
new_uri = QgsDataSourceURI(layer.source())
new_uri.setDataSource(schema+'_'+branch+'_rev_head',
new_uri.table(),
new_uri.geometryColumn(),
new_uri.sql(),
new_uri.keyColumn())
display_name = QgsMapLayerRegistry.instance().mapLayer(layer_id).name()
new_layer = self.iface.addVectorLayer(new_uri.uri().replace('()',''),
display_name, 'postgres')
self.iface.legendInterface().moveLayer( new_layer, grp_idx)
def view(self):
"""create view and import layers"""
layer = QgsMapLayerRegistry.instance().mapLayer(
self.current_layers[0] )
uri = QgsDataSourceURI(layer.source())
mtch = re.match(r'(.+)_([^_]+)_rev_(head|\d+)', uri.schema())
schema = mtch.group(1)
assert(schema)
# Disconnect signals previously connected upon calling this function
# The first time this function is called will throw an error because no
# previous connections to the slots were made
try:
#print "Disconnecting ..."
self.q_view_dlg.tblw.itemChanged.disconnect()
self.q_view_dlg.diffmode_chk.stateChanged.disconnect()
except:
#print "Failed disconnection"
pass
# Make sure combobox is initalized correctly
self.q_view_dlg.diffmode_chk.setCheckState(Qt.Unchecked)
self.q_view_dlg.diffmode_chk.setEnabled(False)
pcur = versioning_base.Db( psycopg2.connect(self.pg_conn_info()) )
pcur.execute("SELECT rev, author, date::timestamp(0), branch, commit_msg "
"FROM "+schema+".revisions ORDER BY rev ASC")
revs = pcur.fetchall()
pcur.close()
self.q_view_dlg.tblw.setRowCount(len(revs))
self.q_view_dlg.tblw.setColumnCount(5)
self.q_view_dlg.tblw.setHorizontalHeaderLabels(['Rev#', 'Author', 'Date',
'Branch', 'Commit Message'])
for i, rev in enumerate(revs):
for j, item in enumerate(rev):
self.q_view_dlg.tblw.setItem(i,j,QTableWidgetItem( str(item) ))
# set rev# checkable
if j == 0:
self.q_view_dlg.tblw.item(i,j).setCheckState(Qt.Unchecked)
self.q_view_dlg.tblw.itemChanged.connect(self.enable_diffmode)
self.q_view_dlg.tblw.resizeRowsToContents()
self.q_view_dlg.tblw.resizeColumnsToContents()
self.q_view_dlg.diffmode_chk.stateChanged.connect(self.check_branches)
if not self.q_view_dlg.exec_():
return
rows = set()
revision_number_list = []
branches = []
for i in range(len(revs)):
if self.q_view_dlg.tblw.item(i,0).checkState():
print "Revision "+ self.q_view_dlg.tblw.item(i,0).text() +" will be fetched"
revision_number_list.append(int(self.q_view_dlg.tblw.item(i,0).text()))
branches.append(self.q_view_dlg.tblw.item(i,3).text())
rows.add(self.q_view_dlg.tblw.item(i,0).row())
progressMessageBar = self.iface.messageBar().createMessage("Querying "
"the database for revision(s) "+str(revision_number_list))
progress = QProgressBar()
progress.setMaximum(len(rows))
progress.setAlignment(Qt.AlignLeft|Qt.AlignVCenter)
progressMessageBar.layout().addWidget(progress)
self.iface.messageBar().pushWidget(progressMessageBar, self.iface.messageBar().INFO)
progress.setValue(0)
# if diffmode, create one layer with feature differences between the
# two revisions; else checkout the full data sets for the specified
# revisions and put them in separate layers (original behaviour)
rev_begin = 0
rev_end = 0
empty_layers = []
grp_name=''
if self.q_view_dlg.diffmode_chk.isChecked():
print "Diffmode checked"
# revision_number_list necessarily has only two items in diffmode
rev_begin = revision_number_list[0]
rev_end = revision_number_list[1]
if rev_begin > rev_end:
rev_begin, rev_end = rev_end, rev_begin
# if the two revisions are not on the same branch, exit
if revs[rev_begin - 1][3] != revs[rev_end - 1][3]:
print "Revisions are not on the same branch, exiting"
#print "Rev_begin " + str(rev_begin) + " is on " + revs[rev_begin - 1][3]
#print "Rev_end " + str(rev_end) + " is on " + revs[rev_end - 1][3]
return
else :
print "Revisions are on the same branch"
#print "Rev_begin " + str(rev_begin) + " is on " + revs[rev_begin - 1][3]
#print "Rev_end " +str(rev_end) + " is on " + revs[rev_end - 1][3]
grp_name = "Compare revisions "+str(rev_begin)+" vs "+ str(rev_end)
grp_idx = self.iface.legendInterface().addGroup( grp_name )
for i, layer_id in enumerate(reversed(self.current_layers)):
progress.setValue(i+1)
layer = QgsMapLayerRegistry.instance().mapLayer(layer_id)
new_uri = QgsDataSourceURI(layer.source())
select_str = versioning_base.diff_rev_view_str( uri.connectionInfo(),
schema, new_uri.table(), branches[0], rev_begin, rev_end )
# change data source uri to point to select sql
# schema needs to be set to empty
new_uri.setDataSource("",
"("+select_str+")",
new_uri.geometryColumn(),
new_uri.sql(),
new_uri.keyColumn())
display_name = QgsMapLayerRegistry.instance().mapLayer(layer_id).name()
#print "new_uri.uri() = " + new_uri.uri()
tmp_pg_layer = self.iface.addVectorLayer( new_uri.uri(),
display_name, 'postgres')
#print "Number of features in layer " + display_name + " = " + str(tmp_pg_layer.featureCount())
# if layer has no feature, delete tmp layer and resume for loop
if not(tmp_pg_layer.featureCount()):
QgsMapLayerRegistry.instance().removeMapLayer( tmp_pg_layer.id() )
empty_layers.append(str(display_name))
continue
mem_uri = self.mem_layer_uri(tmp_pg_layer)
#print "mem_uri = " + mem_uri
if mem_uri == "Unknown":
return
new_mem_layer = self.iface.addVectorLayer( mem_uri,
display_name + '_diff', 'memory')
pr = new_mem_layer.dataProvider()
source_layer_features = [f for f in tmp_pg_layer.getFeatures()]
#print "Got features from source vector layer"
QgsMapLayerRegistry.instance().removeMapLayer( tmp_pg_layer.id() )
#print "Removed tmp layer"
pr.addFeatures(source_layer_features)
#print "Copied source features to mem layer"
# Style layer to show features as a function of whether they were
# - added/created ('a')
# - updated ('u')
# - deleted ('d')
# For all feature types, so do once
# Code from http://snorf.net/blog/2014/03/04/symbology-of-vector-layers-in-qgis-python-plugins
# For colors, use the names at http://www.w3schools.com/HTML/html_colornames.asp, but lowercase only; tested with "aliceblue"
# define some rules: label, expression, color name, size, (min scale, max scale)
modification_type_rules = (
('Intermediate', '"diff_status" LIKE \'i\'', 'aliceblue', 2.0, None),
('Created', '"diff_status" LIKE \'a\'', 'chartreuse', 3.0, None),
('Updated', '"diff_status" LIKE \'u\'', 'sandybrown', 3.0, None),
('Deleted', '"diff_status" LIKE \'d\'', 'red', 3.0, None),)
symbol = QgsSymbolV2.defaultSymbol(new_mem_layer.geometryType())
renderer = QgsRuleBasedRendererV2(symbol)
root_rule = renderer.rootRule()
for label, expression, color_name, size, scale in modification_type_rules:
# create a clone (i.e. a copy) of the default rule
rule = root_rule.children()[0].clone()
# set the label, expression and color
rule.setLabel(label)
rule.setFilterExpression(expression)
rule.symbol().setColor(QColor(color_name))
##rule.symbol().setSize(size) # works only for POINT layers
# set the scale limits if they have been specified
##if scale is not None:
## rule.setScaleMinDenom(scale[0])
## rule.setScaleMaxDenom(scale[1])
# append the rule to the list of rules
root_rule.appendChild(rule)
# delete the default rule
root_rule.removeChildAt(0)
new_mem_layer.setRendererV2(renderer)
# refresh map and legend
self.iface.mapCanvas().refresh()
self.iface.legendInterface().refreshLayerSymbology(new_mem_layer)
self.iface.legendInterface().moveLayer( new_mem_layer, grp_idx)
else:
print "Diffmode unchecked"
for i, row in enumerate(rows):
progress.setValue(i+1)
branch = revs[row][3]
rev = revs[row][0]
grp_name = branch+' revision '+str(rev)
grp_idx = self.iface.legendInterface().addGroup( grp_name )
for layer_id in reversed(self.current_layers):
layer = QgsMapLayerRegistry.instance().mapLayer(layer_id)
new_uri = QgsDataSourceURI(layer.source())
select_str, where_str = versioning_base.rev_view_str(
self.pg_conn_info(),
schema,
new_uri.table(),
branches[0],
rev)
new_uri.setSql(where_str)
new_uri.setDataSource("",
"("+select_str+")",
new_uri.geometryColumn(),
new_uri.sql(),
new_uri.keyColumn())
display_name = QgsMapLayerRegistry.instance().mapLayer(layer_id).name()
src = new_uri.uri().replace('()','')
new_layer = self.iface.addVectorLayer( src,
display_name, 'postgres')
self.iface.legendInterface().moveLayer( new_layer, grp_idx)
self.iface.messageBar().clearWidgets()
#print "len (self.current_layers) = " + str(len (self.current_layers))
#print "len(empty_layers) = " + str(len(empty_layers))
if empty_layers and len(empty_layers) == len (self.current_layers):
print "No layers in layer group"
self.iface.messageBar().pushMessage("Notice",
"No layers will be shown; deleted the \"" +grp_name +"\" layer group",
level=QgsMessageBar.WARNING, duration = 15)
self.iface.legendInterface().removeGroup(grp_idx)
elif empty_layers :
print "Empty layers"
self.iface.messageBar().pushMessage("Notice",
"No modified features between revisions "+str(rev_begin)+" "
"and "+str(rev_end)+" for layer(s) "+str(empty_layers)+". ",
level=QgsMessageBar.WARNING, duration = 15)
def unresolved_conflicts(self):
"""check for unresolved conflicts, add conflict layers if any"""
layer = QgsMapLayerRegistry.instance().mapLayer(
self.current_layers[0] )
uri = QgsDataSourceURI(layer.source())
if layer.providerType() == "spatialite":
unresolved = versioning_base.unresolved_conflicts( uri.database() )
for cflt in unresolved:
table = cflt+"_conflicts"
if not QgsMapLayerRegistry.instance().mapLayersByName(table):
#TODO detect if there is a geometry column
geom = '(GEOMETRY)' #if uri.geometryColumn() else ''
self.iface.addVectorLayer(
"dbname=\""+uri.database()+"\""+
" key=\"OGC_FID\" table=\""+table+"\" "+
geom,table,'spatialite')
else: #postgres
unresolved = versioning_base.pg_unresolved_conflicts(
uri.connectionInfo(), uri.schema() )
for cflt in unresolved:
table = cflt+"_conflicts"
if not QgsMapLayerRegistry.instance().mapLayersByName(table):
new_uri = QgsDataSourceURI( uri.connectionInfo() )
print new_uri.uri()
new_uri.setDataSource(uri.schema(),
table,
uri.geometryColumn(),
uri.sql(),
uri.keyColumn())
src = new_uri.uri().replace('()','')
self.iface.addVectorLayer(src, table, 'postgres')
if unresolved:
QMessageBox.warning( self.iface.mainWindow(), "Warning",
"Unresolved conflics for layer(s) "+', '.join(unresolved)+
".\n\nPlease resolve conflicts by opening the conflict "
"layer attribute table, deleting either 'mine' or "
"'theirs' and saving before continuing.\n\n"
"Please note that the attribute table is not "
"refreshed on save (known bug), once you have deleted and "
"saved the unwanted change in the conflict layer, close and "
"reopen the attribute table to check it's empty.")
return True
else:
return False
def update(self):
"""merge modifiactions since last update into working copy"""
print "update"
if self.unresolved_conflicts():
return
layer = QgsMapLayerRegistry.instance().mapLayer(
self.current_layers[0] )
uri = QgsDataSourceURI(layer.source())
late_by = 0
if layer.providerType() == "spatialite":
late_by = versioning_base.late(
uri.database(), self.pg_conn_info() )
else: # postgres
late_by = versioning_base.pg_late(
self.pg_conn_info(), uri.schema() )
if late_by:
if layer.providerType() == "spatialite":
versioning_base.update( uri.database(), self.pg_conn_info() )
rev = versioning_base.revision( uri.database() )
else: # postgres
versioning_base.pg_update( uri.connectionInfo(), uri.schema() )
rev = versioning_base.pg_revision(
uri.connectionInfo(), uri.schema() )
# Force refresh of map
if self.iface.mapCanvas().isCachingEnabled():
self.iface.mapCanvas().clearCache()
self.iface.mapCanvas().refresh()
else:
self.iface.mapCanvas().refresh()
# Force refresh of rev number in menu text
if layer.providerType() == "spatialite":
self.info.setText( uri.database().split("/")[-1] +' <b>working rev</b>='+str(rev))
else:
self.info.setText( uri.database() +' <b>working rev</b>='+str(rev))
if not self.unresolved_conflicts():
QMessageBox.warning( self.iface.mainWindow(), "Warning",
"Working copy was late by "+str(late_by)+" revision(s).\n"
"Now up to date with remote revision "+str(rev-1)+".")
else:
if layer.providerType() == "spatialite":
rev = versioning_base.revision( uri.database() )
else: # postgres
rev = versioning_base.pg_revision(
uri.connectionInfo(), uri.schema() )
QMessageBox.information( self.iface.mainWindow(), "Info","Working "
"copy already up to date with remote revision "+str(rev-1)+".")
def historize(self):
"""version database"""
uri = None
conn_info = ''
schema = ''
for layer_id in self.current_layers:
layer = QgsMapLayerRegistry.instance().mapLayer( layer_id )
uri = QgsDataSourceURI(layer.source())
if not conn_info:
conn_info = uri.connectionInfo()
else:
assert(conn_info == uri.connectionInfo())
if not schema:
schema = uri.schema()
else:
assert( schema == uri.schema() )
if QMessageBox.Ok != QMessageBox.warning(self.iface.mainWindow(),
"Warning", "This will add 4 columns to all tables in schema "
+schema+" (i.e. even to tables not in this project)",
QMessageBox.Ok, QMessageBox.Cancel):
print "aborted"
return
versioning_base.historize( self.pg_conn_info(), schema )
grp_name = 'trunk revision head'
grp_idx = self.iface.legendInterface().addGroup( grp_name )
for layer_id in reversed(self.current_layers):
layer = QgsMapLayerRegistry.instance().mapLayer(layer_id)
new_uri = QgsDataSourceURI(layer.source())
new_uri.setDataSource(schema+'_trunk_rev_head',
new_uri.table(),
new_uri.geometryColumn(),
new_uri.sql(),
new_uri.keyColumn())
display_name = QgsMapLayerRegistry.instance().mapLayer(layer_id).name()
src = new_uri.uri().replace('()','')
new_layer = self.iface.addVectorLayer(src, display_name, 'postgres')
self.iface.legendInterface().moveLayer( new_layer, grp_idx)
self.iface.legendInterface().removeGroup( self.current_group_idx )
self.current_layers = []
def checkout(self):
"""create working copy from versioned database layers"""
# for each connection, we need the list of tables
tables_for_conninfo = []
# for each layer, we need the list of user selected features to be
# checked out; if a given layer has no user selected features, then all
# features will be checked out
user_selected_features = []
uri = None
conn_info = ''
for layer_id in self.current_layers:
layer = QgsMapLayerRegistry.instance().mapLayer( layer_id )
uri = QgsDataSourceURI(layer.source())
# Get actual PK fror corresponding table
actual_table_pk = versioning_base.get_actual_pk( uri,self.pg_conn_info() )
#print "Actual table pk = " + actual_table_pk
layer_selected_features_ids = layer.selectedFeaturesIds()
# Check if PK from view [uri.keyColumn()] matches actual PK. If not,
# throw error. We need the right PK from the view in order to use
# the efficient selectedFeaturesIds(). selectedFeatures() or other
# ways that lead to a list of QGSFeature objects do not scale well.
if layer_selected_features_ids:
if uri.keyColumn()!= actual_table_pk:
QMessageBox.warning(None,"Warning","Layer \""+layer.name()+
" \" does not have the right primary key.\n\nCheckout will "
"proceed without the selected features subset.")
user_selected_features.append([])
else:
QMessageBox.warning(None,"Warning","You will be checking out "
"the subset of "+str(len(layer_selected_features_ids))+" features "
"you selected in layer \""+layer.name()+"\".\n\nIf you want "
"the whole data set for that layer, abort checkout in the pop "
"up asking for a filename, unselect features and start over.")
user_selected_features.append(layer_selected_features_ids)
else:
user_selected_features.append([])
if not conn_info:
conn_info = uri.connectionInfo()
else:
assert(conn_info == uri.connectionInfo())
table = uri.schema()+"."+uri.table()
tables_for_conninfo.append(table)
filename = QFileDialog.getSaveFileName(self.iface.mainWindow(),
'Save Versioned Layers As', '.', '*.sqlite')
if not filename:
print "aborted"
return
if os.path.isfile(filename):
os.remove(filename)
print "checking out ", tables_for_conninfo, " from ",uri.connectionInfo()
versioning_base.checkout( self.pg_conn_info(),
tables_for_conninfo, filename, user_selected_features )
# add layers from offline version
grp_name = 'working copy'
if grp_name in self.iface.legendInterface().groups():
grp_name = filename
grp_idx = self.iface.legendInterface().addGroup( grp_name )
for layer_id in reversed(self.current_layers):
layer = QgsMapLayerRegistry.instance().mapLayer( layer_id )
uri = QgsDataSourceURI(layer.source())
table = uri.table()
display_name = layer.name()
print "replacing ", display_name
geom = '(GEOMETRY)' if uri.geometryColumn() else ''
new_layer = self.iface.addVectorLayer("dbname=\""+filename+"\""+
" key=\"OGC_FID\" table=\""+table+"_view\" "
+geom,display_name, 'spatialite')
self.iface.legendInterface().moveLayer( new_layer, grp_idx)
self.iface.legendInterface().setGroupExpanded( grp_idx, True )
def checkout_pg(self):
"""create postgres working copy (schema) from versioned
database layers"""
# for each connection, we need the list of tables
tables_for_conninfo = []
uri = None
conn_info = ''
for layer_id in self.current_layers:
layer = QgsMapLayerRegistry.instance().mapLayer( layer_id )
uri = QgsDataSourceURI(layer.source())
if not conn_info:
conn_info = uri.connectionInfo()
else:
assert(conn_info == uri.connectionInfo())
table = uri.schema()+"."+uri.table()
tables_for_conninfo.append(table)
dlg = QDialog()
dlg.setWindowTitle('Enter working copy schema name')
layout = QVBoxLayout(dlg)
button_box = QDialogButtonBox(dlg)
button_box.setStandardButtons(
QDialogButtonBox.Cancel|QDialogButtonBox.Ok)
button_box.accepted.connect(dlg.accept)
button_box.rejected.connect(dlg.reject)
line_edit = QLineEdit( dlg )
layout.addWidget( line_edit )
layout.addWidget( button_box )
if not dlg.exec_() :
return
working_copy_schema = line_edit.text()
if not working_copy_schema:
print "Name not provided; aborted"
self.iface.messageBar().pushMessage("Warning",
"Please provide a schema name.", duration=5)
return
# Check if name is valid for a PG object; only characters and max length
# are checked; use of reserved words is not checked
if len(working_copy_schema) > 63:
print "Name too long; aborted"
self.iface.messageBar().pushMessage("Warning",
"\""+working_copy_schema+"\" is "+str(len(working_copy_schema))+
" characters long; maximum is 63.", duration=5)
return
valid_name = re.match('^[a-z_][a-z_0-9$]*$', str(working_copy_schema))
if not(valid_name):
print "Not a valid name"
self.iface.messageBar().pushMessage("Warning",
"\""+working_copy_schema+"\" is not valid; first character must be "
"<b>lowercase</b> letter or underscore; other characters may be "
"<b>lowercase</b> letters, underscore or digits.", duration=10)
return
print "checking out ", tables_for_conninfo, " from ", uri.connectionInfo()
versioning_base.pg_checkout( self.pg_conn_info(),
tables_for_conninfo, working_copy_schema )