Bug: Improve Pyramid exception support in web

[jamoore]

After import

• Improve message
• Display default thumbnail

When opening viewer, display message indicating the time remaining before the image can be viewed:

    try:
        rawPixelsStore.setPixelId(id) # Or anywhere that MissingPyramidException is handld
    except omero.MissingPyramidException, mpe: # Or any omero.ConcurrencyException
        backOffInMillis = mpe.backOff
        backOffInSecs = backOffInMillis / 1000
        self.handleSuggestedBackOff(backOffInSecs)

Need to handle renderingEngine.load() which is called in _prepareRE which is called by _prepareRenderingEngineused in the decorator

@assert_re

which is used by the following methods

• saveDefaults ()
• getDefaultT() & getDefaultZ()
• getT() & getZ() Not sure why re is needed here?
• renderColLinePlotGif() & renderRowLinePlotGif() Not sure why re is needed here?
• createMovie()
• renderJpeg()
• renderJpegRegion()
• getRenderingModel()
• getRenderingModels()
• getChannels()
• _getProjectedThumbnail ()

Currently, if re.load() throws a MissingPyramidException?, it is thrown by _prepareRE but eaten by _prepareRenderingEngine() and image._re is simply None. E.g leading to errors like:

("error in call","Traceback (most recent call last):
  File "/Users/will/Desktop/OMERO/components/tools/OmeroWeb/omeroweb/../omeroweb/webgateway/views.py", line 917, in wrap
    rv = f(request, *args, **kwargs)
  File "/Users/will/Desktop/OMERO/components/tools/OmeroWeb/omeroweb/../omeroweb/webgateway/views.py", line 1119, in imageData_json
    rv = imageMarshal(image, key)
  File "/Users/will/Desktop/OMERO/components/tools/OmeroWeb/omeroweb/../omeroweb/webgateway/views.py", line 1043, in imageMarshal
    tiles = image._re.requiresPixelsPyramid()
AttributeError: 'NoneType' object has no attribute 'requiresPixelsPyramid'
")

See #5534 for Insight ticket

[wmoore]

First step is to define here, and in gatewaytests, the behavior we want from the various methods listed above.

[Will Moore <will@…>]

(In [b40686bfe685ff0930a3a5ebd5a825ee4f4b95c7/ome.git] on branch develop) missing_pyramid.py gateway test for MPException handling. See #5539

[Will Moore <will@…>]

(In [6efc0cd9ed00317e7ae5438a7115463462390077/ome.git] on branch develop) Blitz _prepareRenderingEngine() throws MissingPyramidException?. See #5539

[Will Moore <will@…>]

(In [ac75961a8a03e1d69aca59c52f932cbabfc2394b/ome.git] on branch develop) Web Image-viewer displays 'MissingPyramidException?' message on re.load(). See #5539

[Will Moore <will@…>]

(In [a420ba5e3e9a5d388263a7779fbb810cc9235afe/ome.git] on branch develop) Webgateway imageMarshal handles _prepareRenderingEngine() failure. See #5539

[Will Moore <will@…>]

(In [2ae90132cfe9c71b0ba9afa8960d8af97e3a0347/ome.git] on branch develop) Blitz gateway handles ConcurrencyException? for missing Pyramid. See #5539

[Will Moore <will@…>]

(In [303c8014852e7302bb1a5559aaa766494e541eda/ome.git] on branch develop) Update webgateway to use ConcurrencyException? for missing pyramid. Closes #5539