def _query(self, uri):
"""Call a solr uri using json"""
logger.info("Solr query: %s" % uri)
if type(uri) == unicode:
uri = uri.encode('utf-8')
response = fetchers.fetch(uri + "&wt=json", timeout=self.timeout)
if response.status != 200:
raise DataSourceError(
"Http call '%s' failed!: %s" % (uri, response.status)
)
data = None
try:
data = json.loads(response.body.decode('utf-8'))
except Exception, ex:
logger.warning("Exception parsing json response: %s" % response.body)
logger.exception(ex)
def tile_image(layer,
z,
x,
y,
start_time,
again=False,
trybetter=True,
real=False):
"""
Returns asked image.
again - is this a second pass on this tile?
trybetter - should we try to combine this tile from better ones?
real - should we return the tile even in not good quality?
"""
x = x % (2**(z - 1))
if y < 0 or y >= (2**(z - 1)):
return None
if not bbox.bbox_is_in(projections.bbox_by_tile(z, x, y, layer["proj"]),
layer.get("data_bounding_box", config.default_bbox),
fully=False):
return None
global cached_objs, cached_hist_list
if "prefix" in layer:
if (layer["prefix"], z, x, y) in cached_objs:
return cached_objs[(layer["prefix"], z, x, y)]
if layer.get("cached", True):
local = config.tiles_cache + layer[
"prefix"] + "/z%s/%s/x%s/%s/y%s." % (z, x / 1024, x, y / 1024, y)
ext = layer["ext"]
if "cache_ttl" in layer:
for ex in [ext, "dsc." + ext, "ups." + ext, "tne"]:
f = local + ex
if os.path.exists(f):
if (os.stat(f).st_mtime <
(time.time() - layer["cache_ttl"])):
os.remove(f)
gpt_image = False
try:
"trying to create local cache directory, if it doesn't exist"
os.makedirs("/".join(local.split("/")[:-1]))
except OSError:
pass
if not os.path.exists(local + "tne") and not os.path.exists(local +
"lock"):
if os.path.exists(local + ext): # First, look for tile in cache
try:
im1 = Image.open(local + ext)
im1.is_ok = True
return im1
except IOError:
if os.path.exists(local + "lock"):
return None
else:
os.remove(local +
ext) # # Cached tile is broken - remove it
if layer["scalable"] and (
z < layer.get("max_zoom", config.default_max_zoom)
) and trybetter: # Second, try to glue image of better ones
if os.path.exists(local + "ups." + ext):
try:
im = Image.open(local + "ups." + ext)
im.is_ok = True
return im
except IOError:
pass
ec = ImageColor.getcolor(
layer.get("empty_color", config.default_background),
"RGBA")
ec = (ec[0], ec[1], ec[2], 0)
im = Image.new("RGBA", (512, 512), ec)
im1 = tile_image(layer, z + 1, x * 2, y * 2, start_time)
if im1:
im2 = tile_image(layer, z + 1, x * 2 + 1, y * 2,
start_time)
if im2:
im3 = tile_image(layer, z + 1, x * 2, y * 2 + 1,
start_time)
if im3:
im4 = tile_image(layer, z + 1, x * 2 + 1,
y * 2 + 1, start_time)
if im4:
im.paste(im1, (0, 0))
im.paste(im2, (256, 0))
im.paste(im3, (0, 256))
im.paste(im4, (256, 256))
im = im.resize((256, 256), Image.ANTIALIAS)
if layer.get("cached", True):
try:
im.save(local + "ups." + ext)
except IOError:
pass
im.is_ok = True
return im
if not again:
if "fetch" in layer:
delta = (datetime.datetime.now() - start_time)
delta = delta.seconds + delta.microseconds / 1000000.
if (config.deadline > delta) or (z < 4):
im = fetchers.fetch(z, x, y,
layer) # Try fetching from outside
if im:
im.is_ok = True
return im
if real and (z > 1):
im = tile_image(layer,
z - 1,
int(x / 2),
int(y / 2),
start_time,
again=False,
trybetter=False,
real=True)
if im:
im = im.crop((128 * (x % 2), 128 * (y % 2),
128 * (x % 2) + 128, 128 * (y % 2) + 128))
im = im.resize((256, 256), Image.BILINEAR)
im.is_ok = False
return im
else:
if "fetch" in layer:
delta = (datetime.datetime.now() - start_time)
delta = delta.seconds + delta.microseconds / 1000000.
if (config.deadline > delta) or (z < 4):
im = fetchers.fetch(z, x, y,
layer) # Try fetching from outside
if im:
im.is_ok = True
return im
def tile_image (layer, z, x, y, start_time, again=False, trybetter = True, real = False):
"""
Returns asked image.
again - is this a second pass on this tile?
trybetter - should we try to combine this tile from better ones?
real - should we return the tile even in not good quality?
"""
x = x % (2 ** (z-1))
if y<0 or y >= (2 ** (z-1)):
return None
if not bbox.bbox_is_in(projections.bbox_by_tile(z,x,y,layer["proj"]), layer.get("data_bounding_box",config.default_bbox), fully=False):
return None
global cached_objs, cached_hist_list
if "prefix" in layer:
if (layer["prefix"], z, x, y) in cached_objs:
return cached_objs[(layer["prefix"], z, x, y)]
if layer.get("cached", True):
local = config.tiles_cache + layer["prefix"] + "/z%s/%s/x%s/%s/y%s."%(z, x/1024, x, y/1024,y)
ext = layer["ext"]
if "cache_ttl" in layer:
for ex in [ext, "dsc."+ext, "ups."+ext, "tne"]:
f = local+ex
if os.path.exists(f):
if (os.stat(f).st_mtime < (time.time()-layer["cache_ttl"])):
os.remove(f)
gpt_image = False
try:
"trying to create local cache directory, if it doesn't exist"
os.makedirs("/".join(local.split("/")[:-1]))
except OSError:
pass
if not os.path.exists(local+"tne") and not os.path.exists(local+"lock"):
if os.path.exists(local+ext): # First, look for tile in cache
try:
im1 = Image.open(local+ext)
im1.is_ok = True
return im1
except IOError:
if os.path.exists(local+"lock"):
return None
else:
os.remove(local+ext) # # Cached tile is broken - remove it
if layer["scalable"] and (z<layer.get("max_zoom", config.default_max_zoom)) and trybetter: # Second, try to glue image of better ones
if os.path.exists(local+"ups."+ext):
try:
im = Image.open(local+"ups."+ext)
im.is_ok = True
return im
except IOError:
pass
ec = ImageColor.getcolor(layer.get("empty_color", config.default_background), "RGBA")
ec = (ec[0],ec[1],ec[2],0)
im = Image.new("RGBA", (512, 512), ec)
im1 = tile_image(layer, z+1,x*2,y*2, start_time)
if im1:
im2 = tile_image(layer, z+1,x*2+1,y*2, start_time)
if im2:
im3 = tile_image(layer, z+1,x*2,y*2+1, start_time)
if im3:
im4 = tile_image(layer, z+1,x*2+1,y*2+1, start_time)
if im4:
im.paste(im1,(0,0))
im.paste(im2,(256,0))
im.paste(im3,(0,256))
im.paste(im4,(256,256))
im = im.resize((256,256),Image.ANTIALIAS)
if layer.get("cached", True):
try:
im.save(local+"ups."+ext)
except IOError:
pass
im.is_ok = True
return im
if not again:
if "fetch" in layer:
delta = (datetime.datetime.now() - start_time)
delta = delta.seconds + delta.microseconds/1000000.
if (config.deadline > delta) or (z < 4):
im = fetchers.fetch(z,x,y,layer) # Try fetching from outside
if im:
im.is_ok = True
return im
if real and (z>1):
im = tile_image(layer, z-1, int(x/2), int(y/2), start_time, again=False, trybetter=False, real=True)
if im:
im = im.crop((128 * (x % 2), 128 * (y % 2), 128 * (x % 2) + 128, 128 * (y % 2) + 128))
im = im.resize((256,256), Image.BILINEAR)
im.is_ok = False
return im
else:
if "fetch" in layer:
delta = (datetime.datetime.now() - start_time)
delta = delta.seconds + delta.microseconds/1000000.
if (config.deadline > delta) or (z < 4):
im = fetchers.fetch(z,x,y,layer) # Try fetching from outside
if im:
im.is_ok = True
return im