def makeSVSExchangeFormatFile(exportParams):
"""Generates a SVS export. If multiple time values are specified, the result will contain a WMS URL for each.
"""
layerInfo = exportParams.layerInfoList[exportParams.animationLayerNumber - 1]
# Make a set of parameters that excludes the dimension over which animation is to occur.
baseParams = layerInfo.params.copy()
if (exportParams.animationDimension != None) and (exportParams.animationDimension in baseParams):
del baseParams[exportParams.animationDimension]
baseUrl = wmc_util.parseEndpointString(layerInfo.endpoint, baseParams)
# Create the export XML file.
domImpl = xml.dom.minidom.getDOMImplementation()
doc = domImpl.createDocument(None, "MovieExport", None)
rootEl = doc.documentElement
movieEl = doc.createElement("Movie")
movieEl.setAttribute("framesPerSecond", exportParams.frameRate)
rootEl.appendChild(movieEl)
# Add a "wmsURL" for each dimension value.
if exportParams.animationDimension == None:
requestUrl = baseUrl
xml_util.appendElement(doc, movieEl, "wmsURL", baseUrl)
else:
for val in exportParams.dimensionValues:
requestUrl = baseUrl + "&" + urllib.urlencode({exportParams.animationDimension: val})
log.debug("URL: %s" % (requestUrl));
xml_util.appendElement(doc, movieEl, "wmsURL", requestUrl)
# Include the outline URL.
outlineLayerNumber = exportParams.getOutlineLayerNumber()
if outlineLayerNumber != None:
outlineInfo = exportParams.layerInfoList[outlineLayerNumber - 1]
outlineUrl = wmc_util.parseEndpointString(outlineInfo.endpoint, outlineInfo.params)
xml_util.appendElement(doc, movieEl, "outlineURL", outlineUrl)
# Include the legend URL if included in the layer data.
if layerInfo.legendURL != None:
log.debug("legendURL %s" % (layerInfo.legendURL))
xml_util.appendElement(doc, movieEl, "legendURL", layerInfo.legendURL);
# Include the capabilities URL if included in the layer data.
if layerInfo.capabilitiesURL != None:
log.debug("capabilitiesURL %s" % (layerInfo.capabilitiesURL))
xml_util.appendElement(doc, movieEl, "capabilitiesURL", layerInfo.capabilitiesURL)
outFile = tempfile.NamedTemporaryFile(prefix=exportParams.fileNamePrefix, suffix=".xml", delete=False,
dir=exportParams.exportDir)
log.debug("File: %s" % (outFile.name))
doc.writexml(outFile, addindent=" ", newl="\n", encoding="utf-8")
outFile.close()
return ExportResult(True, fileName = os.path.basename(outFile.name))
def makeWmsDetailsFile(exportParams):
"""Generates a WMS export containing the URLs for the map, capabilities and legend for the current map.
"""
# Create the export XML file.
domImpl = xml.dom.minidom.getDOMImplementation()
doc = domImpl.createDocument(None, "WmsDetails", None)
rootEl = doc.documentElement
# Construct a WMS GetMap URL for each layer.
layerNumber = 1
for layerInfo in exportParams.layerInfoList:
wmsURL = wmc_util.parseEndpointString(layerInfo.endpoint, layerInfo.params)
wmsUrlEl = doc.createElement("wmsURL")
wmsUrlEl.setAttribute("layer", layerNumber.__str__())
wmsUrlTextEl = doc.createTextNode(wmsURL)
wmsUrlEl.appendChild(wmsUrlTextEl)
rootEl.appendChild(wmsUrlEl)
layerNumber += 1
# Include the legend URL if included in the layer data.
layerInfo = exportParams.layerInfoList[exportParams.animationLayerNumber - 1]
if layerInfo.legendURL != None:
log.debug("legendURL %s" % (layerInfo.legendURL))
xml_util.appendElement(doc, rootEl, "legendURL", layerInfo.legendURL);
outFile = tempfile.NamedTemporaryFile(prefix=exportParams.fileNamePrefix, suffix=".xml", delete=False,
dir=exportParams.exportDir)
log.debug("File: %s" % (outFile.name))
doc.writexml(outFile, addindent=" ", newl="\n", encoding="utf-8")
outFile.close()
return ExportResult(True, fileName = os.path.basename(outFile.name))
def makeKmlFile(exportParams):
"""Generates a KML export. If multiple dimension values are specified, the result will contain an overlay for each.
"""
layerInfo = exportParams.layerInfoList[exportParams.animationLayerNumber - 1]
# Make a set of parameters that excludes the dimension over which animation is to occur.
baseParams = layerInfo.params.copy()
# Determine if animation over multiple values is to occur.
do_animation = ((exportParams.animationDimension != None) and
(exportParams.dimensionValues != None) and (len(exportParams.dimensionValues) > 1))
if do_animation and (exportParams.animationDimension in baseParams):
del baseParams[exportParams.animationDimension]
# Get the bounding box values [W, S, E, N].
bounds = exportParams.commonLayerParams['BBOX'].split(',')
baseUrl = wmc_util.parseEndpointString(layerInfo.endpoint, baseParams)
# Create the export XML file.
domImpl = xml.dom.minidom.getDOMImplementation()
doc = domImpl.createDocument("http://earth.google.com/kml/2.2", "kml", None)
rootEl = doc.documentElement
folderEl = doc.createElement("Folder")
rootEl.appendChild(folderEl)
xml_util.appendElement(doc, folderEl, "name", layerInfo.layerName)
xml_util.appendElement(doc, folderEl, "open", "1")
# Add a "wmsURL" for each dimension value.
layerIndex = 0
if do_animation:
itr = iter(exportParams.dimensionValues)
val = itr.next()
for nextVal in itr:
makeKmlGroundOverlayFile(doc, folderEl, layerInfo.layerName, baseUrl, exportParams.animationDimension,
val, val, nextVal, bounds, layerIndex)
val = nextVal
layerIndex += 1
makeKmlGroundOverlayFile(doc, folderEl, layerInfo.layerName, baseUrl, exportParams.animationDimension,
val, val, None, bounds, layerIndex)
else:
makeKmlGroundOverlayFile(doc, folderEl, layerInfo.layerName, baseUrl, None, None, None, None, bounds, layerIndex)
outFile = tempfile.NamedTemporaryFile(prefix=exportParams.fileNamePrefix, suffix=".kml", delete=False, dir=exportParams.exportDir)
log.debug("File: %s" % (outFile.name))
doc.writexml(outFile, addindent=" ", newl="\n", encoding="utf-8")
outFile.close()
return ExportResult(True, fileName = os.path.basename(outFile.name))
def makeVideo(exportParams):
"""Generates a video export.
Creates an image for each frame then combines this into a video according to the format specified.
"""
# Check that the number of steps is within range.
maxNumberSteps = int(exportParams.configuration['maxnumbersteps'])
log.debug("Number steps %d max %d" % (exportParams.numberSteps, maxNumberSteps))
if exportParams.numberSteps > maxNumberSteps:
return ExportResult(False,
errorMessage = ('The number of steps for a video cannot exceed %d' % maxNumberSteps))
layerInfo = exportParams.layerInfoList[exportParams.animationLayerNumber - 1]
animationLayerParams = layerInfo.params
if (exportParams.animationDimension != None) and (exportParams.animationDimension in animationLayerParams):
del animationLayerParams[exportParams.animationDimension]
imageDir = tempfile.mkdtemp(prefix="viewdataVideoExport", suffix="", dir=exportParams.exportDir)
# Create an image for each dimension value.
imageIndex = 0
if exportParams.animationDimension == None:
createImage(exportParams.params, exportParams.figureOptions, exportParams.commonLayerParams,
exportParams.layerInfoList, imageDir, imageIndex, None)
else:
# Initialise a list of cached images to be used for layers that don't change between steps.
imageCache = [None] * len(exportParams.layerInfoList)
for val in exportParams.dimensionValues:
# Clear the cached image for the layer that is being animated.
imageCache[exportParams.animationLayerNumber - 1] = None
# Set the current value of the animated dimension.
animationLayerParams[exportParams.animationDimension] = val
# Update the legend URL with the animated dimension value.
animationLayerLegendUrl = layerInfo.legendURL
layerInfo.legendURL = wmc_util.parseEndpointString(animationLayerLegendUrl, {exportParams.animationDimension: val})
# Create the image file for this value.
createImage(exportParams.params, exportParams.figureOptions, exportParams.commonLayerParams,
exportParams.layerInfoList, imageDir, imageIndex, imageCache)
imageIndex = imageIndex + 1
# Create the video from the individual images.
try:
outFilePath = createVideo(exportParams.formatName, exportParams.frameRate, imageDir, exportParams.exportDir,
exportParams.fileNamePrefix)
except Exception, err:
log.error("Exception creating video: %s" % err)
outFilePath = None
def buildImage(layerInfoList, imageCache):
"""Fetches and merges the figure images.
@param layerInfoList: list of LayerInfo defining layers to include in the figure
@param imageCache: cache of images that have been generated for layers (used for animations
where dimensions only vary in the layer over which animation occurs)
"""
images = []
st = time.time()
log.debug("Starting buildImage")
size = None
layerIndex = 0
for layerInfo in layerInfoList:
if imageCache == None or imageCache[layerIndex] == None:
requestURL = wmc_util.parseEndpointString(layerInfo.endpoint, layerInfo.params)
req = urllib2.Request(requestURL)
req.add_header('Cookie', request.headers.get('Cookie', ''))
filehandle = wmc_util.openURL(req)
imageString = StringIO(filehandle.read())
img = Image.open(imageString)
layerInfo.cachedImage = img
if imageCache != None:
imageCache[layerIndex] = img
else:
img = imageCache[layerIndex]
images.append(img)
size = img.size
log.debug("img.size = %s, img.mode = %s" % (img.size, img.mode,))
layerIndex = layerIndex + 1
background = Image.new('RGBA', size, (255,255,255,255))
log.debug("creating final image...")
images.reverse()
images.insert(0, background)
finalImg = merge(*images)
log.debug("finished buildImage in %s" % (time.time() - st,))
return finalImg
def _getWCSObj(self, endpoint):
oldProxy = proxyFix(endpoint)
try:
log.debug("wcs endpoint = %s" % (endpoint,))
getCapabilitiesEndpoint = parseEndpointString(endpoint, {"Service": "WCS", "Request": "GetCapabilities"})
log.debug("wcs endpoint = %s" % (getCapabilitiesEndpoint,))
# requires OWSLib with cookie support
wcs = WebCoverageService(
getCapabilitiesEndpoint, version="1.0.0", cookies=request.headers.get("Cookie", "")
)
layers = [x[0] for x in wcs.items()]
finally:
resetProxy(oldProxy)
return wcs, layers
def getLayers(self, endpoint, parentId, idMap, keywordData, forceRefresh):
"""Returns a list of 'endpoint_hierarchy_builder.Node's for the layers of an endpoint in a WMC document.
Also, adds nodes to a map from node ID to node.
"""
log.debug("getLayers called for %s", endpoint['wmsurl'])
log.debug(" keywordData: %s" % keywordData)
wmsUrl = self.makeProxiedUrl(endpoint['wmsurl'])
wmcDoc = self.wmsCapabilityCache.getWmsCapabilities(wmsUrl, True)
dom = xml.dom.minidom.parseString(wmcDoc)
# Get the namespace URI for the document root element.
ns = dom.documentElement.namespaceURI
# Get the version the WMS server responded with.
wmsVersion = dom.documentElement.getAttribute('version')
nodes = []
capability = xml_util.getSingleChildByNameNS(dom.documentElement, ns, 'Capability')
if capability == None:
return None
getCapabilitiesUrlEl = xml_util.getSingleChildByPathNS(capability,
[(ns, 'Request'), (ns, 'GetCapabilities'), (ns, 'DCPType'),
(ns, 'HTTP'), (ns, 'Get'), (ns, 'OnlineResource')])
getCapabilitiesUrl = getCapabilitiesUrlEl.getAttributeNS(XLINK_URI, 'href')
if not getCapabilitiesUrl:
getCapabilitiesUrl = xml_util.getAttributeByLocalName(getCapabilitiesUrlEl, 'href')
log.debug("GetCapabilities URL: %s", getCapabilitiesUrl)
getCapabilitiesUrl = parseEndpointString(getCapabilitiesUrl, {'REQUEST':'GetCapabilities', 'SERVICE':'WMS'})
getFeatureInfoOnlineResourceEl = xml_util.getSingleChildByPathNS(capability,
[(ns, 'Request'), (ns, 'GetFeatureInfo'),
(ns, 'DCPType'), (ns, 'HTTP'),
(ns, 'Get'), (ns, 'OnlineResource')])
if getFeatureInfoOnlineResourceEl:
getFeatureInfoUrl = getFeatureInfoOnlineResourceEl.getAttributeNS(XLINK_URI, 'href')
if not getFeatureInfoUrl:
getFeatureInfoUrl = xml_util.getAttributeByLocalName(getFeatureInfoOnlineResourceEl, 'href')
log.debug("GetFeatureInfo URL: %s", getFeatureInfoUrl)
getFeatureInfoUrl = getFeatureInfoUrl.rstrip('?&')
else:
getFeatureInfoUrl = None
getMapOnlineResourceEl = xml_util.getSingleChildByPathNS(capability,
[(ns, 'Request'), (ns, 'GetMap'), (ns, 'DCPType'), (ns, 'HTTP'),
(ns, 'Get'), (ns, 'OnlineResource')])
getMapUrl = getMapOnlineResourceEl.getAttributeNS(XLINK_URI, 'href')
if not getMapUrl:
getMapUrl = xml_util.getAttributeByLocalName(getMapOnlineResourceEl, 'href')
log.debug("GetMap URL: %s", getMapUrl)
getMapUrl = getMapUrl.rstrip('?&')
getMapUrl = self.makeProxiedUrl(getMapUrl)
commonData = {
'getCapabilitiesUrl': getCapabilitiesUrl,
'getFeatureInfoUrl': getFeatureInfoUrl,
'getMapUrl': getMapUrl,
'wmsVersion': wmsVersion
}
if 'wcsurl' in endpoint:
commonData['getCoverageUrl'] = endpoint['wcsurl']
for layer in xml_util.getChildrenByNameNS(capability, ns, 'Layer'):
self.handleLayer(ns, layer, nodes, endpoint, parentId, commonData, keywordData, idMap)
# Break internal references to facilitate garbage collection.
dom.unlink()
return nodes
