class TileManager(object):
"""
Manages tiles for a single grid.
Loads tiles from the cache, creates new tiles from sources and stores them
into the cache, or removes tiles.
:param pre_store_filter: a list with filter. each filter will be called
with a tile before it will be stored to disc. the filter should
return this or a new tile object.
"""
def __init__(self, grid, cache, sources, format, image_opts=None, request_format=None,
meta_buffer=None, meta_size=None, minimize_meta_requests=False,
pre_store_filter=None, concurrent_tile_creators=1,max_age=None):
self.grid = grid
self.cache = cache
self.meta_grid = None
self.format = format
self.image_opts = image_opts
self.request_format = request_format or format
self.sources = sources
self.minimize_meta_requests = minimize_meta_requests
self._max_age = max_age
self._expire_timestamp = None
self.transparent = self.sources[0].transparent
self.pre_store_filter = pre_store_filter or []
self.concurrent_tile_creators = concurrent_tile_creators
if meta_buffer or (meta_size and not meta_size == [1, 1]):
if all(source.supports_meta_tiles for source in sources):
self.meta_grid = MetaGrid(grid, meta_size=meta_size, meta_buffer=meta_buffer)
elif any(source.supports_meta_tiles for source in sources):
raise ValueError('meta tiling configured but not supported by all sources')
@contextmanager
def session(self):
"""
Context manager for access to the cache. Cleans up after usage
for connection based caches.
>>> with tile_manager.session(): #doctest: +SKIP
... tile_manager.load_tile_coords(tile_coords)
"""
yield
self.cleanup()
def cleanup(self):
if hasattr(self.cache, 'cleanup'):
self.cache.cleanup()
def load_tile_coord(self, tile_coord, with_metadata=False):
tile = Tile(tile_coord)
self.cache.load_tile(tile, with_metadata)
if tile.coord is not None and not self.is_cached(tile):
# missing or staled
creator = self.creator()
created_tiles = creator.create_tiles([tile])
for created_tile in created_tiles:
if created_tile.coord == tile_coord:
return created_tile
return tile
def load_tile_coords(self, tile_coords, with_metadata=False):
tiles = TileCollection(tile_coords)
uncached_tiles = []
# load all in batch
self.cache.load_tiles(tiles, with_metadata)
for tile in tiles:
if tile.coord is not None and not self.is_cached(tile):
# missing or staled
uncached_tiles.append(tile)
if uncached_tiles:
creator = self.creator()
created_tiles = creator.create_tiles(uncached_tiles)
for created_tile in created_tiles:
if created_tile.coord in tiles:
tiles[created_tile.coord].source = created_tile.source
return tiles
def remove_tile_coords(self, tile_coords):
tiles = TileCollection(tile_coords)
self.cache.remove_tiles(tiles)
def creator(self):
return TileCreator(self.cache, self.sources, self.grid, self.meta_grid, self)
def lock(self, tile):
if self.meta_grid:
tile = Tile(self.meta_grid.main_tile(tile.coord))
return self.cache.lock(tile)
def is_cached(self, tile):
"""
Return True if the tile is cached.
"""
if isinstance(tile, tuple):
tile = Tile(tile)
if tile.coord is None:
return True
cached = self.cache.is_cached(tile)
max_mtime = self.expire_timestamp(tile)
if cached and max_mtime is not None:
self.cache.load_tile_metadata(tile)
stale = max_mtime < time.time()
""" #### Debug ####
log.info('Expires:')
log.info(max_mtime)
log.info('Current Time:')
log.info(time.time())
"""
if stale:
cached = False
""" log.info('Tile is passed its used by date and starting to smell - will request a new version.') """
return cached
def is_stale(self, tile):
"""
Return True if tile exists _and_ is expired.
"""
if isinstance(tile, tuple):
tile = Tile(tile)
if self.cache.is_cached(tile):
# tile exists
if not self.is_cached(tile):
# expired
return True
return False
return False
def expire_timestamp(self, tile=None):
"""
Return the timestamp until which a tile should be accepted as up-to-date,
or ``None`` if the tiles should not expire.
:note: Returns _expire_timestamp by default.
"""
"""
If we have got a max_age variable from the YAML, work out the timestamp that this tile should expire
"""
if self._max_age is not None and tile is not None:
if 'time' in self._max_age:
try:
return timestamp_from_isodate(self._max_age['time'])
except ValueError:
log.warn("Could not parse time '%s'. should be ISO time string" % (self._max_age["time"]))
deltas = {}
for delta_type in ('weeks', 'days', 'hours', 'minutes'):
deltas[delta_type] = self._max_age.get(delta_type, 0)
self.cache.load_tile_metadata(tile)
return tile.timestamp + datetime.timedelta(**deltas).total_seconds()
return self._expire_timestamp
def apply_tile_filter(self, tile):
"""
Apply all `pre_store_filter` to this tile.
Returns filtered tile.
"""
if tile.stored:
return tile
for img_filter in self.pre_store_filter:
tile = img_filter(tile)
return tile
class TileManager(object):
"""
Manages tiles for a single grid.
Loads tiles from the cache, creates new tiles from sources and stores them
into the cache, or removes tiles.
:param pre_store_filter: a list with filter. each filter will be called
with a tile before it will be stored to disc. the filter should
return this or a new tile object.
"""
def __init__(self, grid, cache, sources, format, image_opts=None, request_format=None,
meta_buffer=None, meta_size=None, minimize_meta_requests=False,
pre_store_filter=None, concurrent_tile_creators=1):
self.grid = grid
self.cache = cache
self.meta_grid = None
self.format = format
self.image_opts = image_opts
self.request_format = request_format or format
self.sources = sources
self.minimize_meta_requests = minimize_meta_requests
self._expire_timestamp = None
self.transparent = self.sources[0].transparent
self.pre_store_filter = pre_store_filter or []
self.concurrent_tile_creators = concurrent_tile_creators
if meta_buffer or (meta_size and not meta_size == [1, 1]):
if all(source.supports_meta_tiles for source in sources):
self.meta_grid = MetaGrid(grid, meta_size=meta_size, meta_buffer=meta_buffer)
elif any(source.supports_meta_tiles for source in sources):
raise ValueError('meta tiling configured but not supported by all sources')
@contextmanager
def session(self):
"""
Context manager for access to the cache. Cleans up after usage
for connection based caches.
>>> with tile_manager.session(): #doctest: +SKIP
... tile_manager.load_tile_coords(tile_coords)
"""
yield
self.cleanup()
def cleanup(self):
if hasattr(self.cache, 'cleanup'):
self.cache.cleanup()
def load_tile_coord(self, tile_coord, dimensions=None, with_metadata=False):
tile = Tile(tile_coord)
self.cache.load_tile(tile, with_metadata)
if tile.coord is not None and not self.is_cached(tile, dimensions=dimensions):
# missing or staled
creator = self.creator(dimensions=dimensions)
created_tiles = creator.create_tiles([tile])
for created_tile in created_tiles:
if created_tile.coord == tile_coord:
return created_tile
return tile
def load_tile_coords(self, tile_coords, dimensions=None, with_metadata=False):
tiles = TileCollection(tile_coords)
uncached_tiles = []
# load all in batch
self.cache.load_tiles(tiles, with_metadata)
for tile in tiles:
if tile.coord is not None and not self.is_cached(tile, dimensions=dimensions):
# missing or staled
uncached_tiles.append(tile)
if uncached_tiles:
creator = self.creator(dimensions=dimensions)
created_tiles = creator.create_tiles(uncached_tiles)
for created_tile in created_tiles:
if created_tile.coord in tiles:
tiles[created_tile.coord].source = created_tile.source
return tiles
def remove_tile_coords(self, tile_coords, dimensions=None):
tiles = TileCollection(tile_coords)
self.cache.remove_tiles(tiles)
def creator(self, dimensions=None):
return TileCreator(self.cache, self.sources, self.grid, self.meta_grid,
self, dimensions=dimensions)
def lock(self, tile):
if self.meta_grid:
tile = Tile(self.meta_grid.main_tile(tile.coord))
return self.cache.lock(tile)
def is_cached(self, tile, dimensions=None):
"""
Return True if the tile is cached.
"""
if isinstance(tile, tuple):
tile = Tile(tile)
if tile.coord is None:
return True
cached = self.cache.is_cached(tile)
max_mtime = self.expire_timestamp(tile)
if cached and max_mtime is not None:
self.cache.load_tile_metadata(tile)
stale = tile.timestamp < max_mtime
if stale:
cached = False
return cached
def is_stale(self, tile, dimensions=None):
"""
Return True if tile exists _and_ is expired.
"""
if isinstance(tile, tuple):
tile = Tile(tile)
if self.cache.is_cached(tile):
# tile exists
if not self.is_cached(tile):
# expired
return True
return False
return False
def expire_timestamp(self, tile=None):
"""
Return the timestamp until which a tile should be accepted as up-to-date,
or ``None`` if the tiles should not expire.
:note: Returns _expire_timestamp by default.
"""
return self._expire_timestamp
def apply_tile_filter(self, tile):
"""
Apply all `pre_store_filter` to this tile.
Returns filtered tile.
"""
if tile.stored:
return tile
for img_filter in self.pre_store_filter:
tile = img_filter(tile)
return tile
class TileManager(object):
"""
Manages tiles for a single grid.
Loads tiles from the cache, creates new tiles from sources and stores them
into the cache, or removes tiles.
:param pre_store_filter: a list with filter. each filter will be called
with a tile before it will be stored to disc. the filter should
return this or a new tile object.
"""
def __init__(self, grid, cache, sources, format, locker, image_opts=None, request_format=None,
meta_buffer=None, meta_size=None, minimize_meta_requests=False, identifier=None,
pre_store_filter=None, concurrent_tile_creators=1, tile_creator_class=None,
bulk_meta_tiles=False,
rescale_tiles=0,
cache_rescaled_tiles=False,
):
self.grid = grid
self.cache = cache
self.locker = locker
self.identifier = identifier
self.meta_grid = None
self.format = format
self.image_opts = image_opts
self.request_format = request_format or format
self.sources = sources
self.minimize_meta_requests = minimize_meta_requests
self._expire_timestamp = None
self.pre_store_filter = pre_store_filter or []
self.concurrent_tile_creators = concurrent_tile_creators
self.tile_creator_class = tile_creator_class or TileCreator
self.rescale_tiles = rescale_tiles
self.cache_rescaled_tiles = cache_rescaled_tiles
if meta_buffer or (meta_size and not meta_size == [1, 1]):
if all(source.supports_meta_tiles for source in sources):
self.meta_grid = MetaGrid(grid, meta_size=meta_size, meta_buffer=meta_buffer)
elif any(source.supports_meta_tiles for source in sources):
raise ValueError('meta tiling configured but not supported by all sources')
elif meta_size and not meta_size == [1, 1] and bulk_meta_tiles:
# meta tiles configured but all sources are tiled
# use bulk_meta_tile mode that download tiles in parallel
self.meta_grid = MetaGrid(grid, meta_size=meta_size, meta_buffer=0)
self.tile_creator_class = partial(self.tile_creator_class, bulk_meta_tiles=True)
@contextmanager
def session(self):
"""
Context manager for access to the cache. Cleans up after usage
for connection based caches.
>>> with tile_manager.session(): #doctest: +SKIP
... tile_manager.load_tile_coords(tile_coords)
"""
yield
self.cleanup()
def cleanup(self):
if hasattr(self.cache, 'cleanup'):
self.cache.cleanup()
def load_tile_coord(self, tile_coord, dimensions=None, with_metadata=False):
return self.load_tile_coords(
[tile_coord], dimensions=dimensions, with_metadata=with_metadata,
)[0]
def load_tile_coords(self, tile_coords, dimensions=None, with_metadata=False):
tiles = TileCollection(tile_coords)
rescale_till_zoom = 0
if self.rescale_tiles:
rescaled_tiles = {}
for t in tiles.tiles:
# Use zoom level from first None tile.
if t.coord is not None:
rescale_till_zoom = t.coord[2] + self.rescale_tiles
break
else:
return tiles
if rescale_till_zoom < 0:
rescale_till_zoom = 0
if rescale_till_zoom > self.grid.levels:
rescale_till_zoom = self.grid.levels
tiles = self._load_tile_coords(
tiles, dimensions=dimensions, with_metadata=with_metadata,
rescale_till_zoom=rescale_till_zoom, rescaled_tiles={},
)
for t in tiles.tiles:
# Remove our internal marker source, for missing tiles.
if t.source is RESCALE_TILE_MISSING:
t.source = None
return tiles
def _load_tile_coords(self, tiles, dimensions=None, with_metadata=False,
rescale_till_zoom=None, rescaled_tiles=None,
):
uncached_tiles = []
if rescaled_tiles:
for t in tiles:
if t.coord in rescaled_tiles:
t.source = rescaled_tiles[t.coord].source
# load all in batch
self.cache.load_tiles(tiles, with_metadata)
for tile in tiles:
if tile.coord is not None and not self.is_cached(tile, dimensions=dimensions):
# missing or staled
uncached_tiles.append(tile)
if uncached_tiles:
creator = self.creator(dimensions=dimensions)
created_tiles = creator.create_tiles(uncached_tiles)
if not created_tiles and self.rescale_tiles:
created_tiles = [self._scaled_tile(t, rescale_till_zoom, rescaled_tiles) for t in uncached_tiles]
for created_tile in created_tiles:
if created_tile.coord in tiles:
tiles[created_tile.coord].source = created_tile.source
return tiles
def remove_tile_coords(self, tile_coords, dimensions=None):
tiles = TileCollection(tile_coords)
self.cache.remove_tiles(tiles)
def creator(self, dimensions=None):
return self.tile_creator_class(self, dimensions=dimensions)
def lock(self, tile):
if self.meta_grid:
tile = Tile(self.meta_grid.main_tile(tile.coord))
return self.locker.lock(tile)
def is_cached(self, tile, dimensions=None):
"""
Return True if the tile is cached.
"""
if isinstance(tile, tuple):
tile = Tile(tile)
if tile.coord is None:
return True
cached = self.cache.is_cached(tile)
max_mtime = self.expire_timestamp(tile)
if cached and max_mtime is not None:
self.cache.load_tile_metadata(tile)
stale = tile.timestamp < max_mtime
if stale:
cached = False
return cached
def is_stale(self, tile, dimensions=None):
"""
Return True if tile exists _and_ is expired.
"""
if isinstance(tile, tuple):
tile = Tile(tile)
if self.cache.is_cached(tile):
# tile exists
if not self.is_cached(tile):
# expired
return True
return False
return False
def expire_timestamp(self, tile=None):
"""
Return the timestamp until which a tile should be accepted as up-to-date,
or ``None`` if the tiles should not expire.
:note: Returns _expire_timestamp by default.
"""
return self._expire_timestamp
def apply_tile_filter(self, tile):
"""
Apply all `pre_store_filter` to this tile.
Returns filtered tile.
"""
if tile.stored:
return tile
for img_filter in self.pre_store_filter:
tile = img_filter(tile)
return tile
def _scaled_tile(self, tile, stop_zoom, rescaled_tiles):
"""
Try to load tile by loading, scaling and clipping tiles from zoom levels above or
below. stop_zoom determines if tiles from above should be scaled up, or if tiles
from below should be scaled down.
Returns an empty Tile if tile zoom level is stop_zoom.
"""
if tile.coord in rescaled_tiles:
return rescaled_tiles[tile.coord]
# Cache tile in rescaled_tiles. We initially set source to a fixed
# BlankImageSource and overwrite it if we actually rescaled the tile.
tile.source = RESCALE_TILE_MISSING
rescaled_tiles[tile.coord] = tile
tile_bbox = self.grid.tile_bbox(tile.coord)
current_zoom = tile.coord[2]
if stop_zoom == current_zoom:
return tile
if stop_zoom > current_zoom:
src_level = current_zoom + 1
else:
src_level = current_zoom - 1
src_bbox, src_tile_grid, affected_tile_coords = self.grid.get_affected_level_tiles(tile_bbox, src_level)
affected_tiles = TileCollection(affected_tile_coords)
for t in affected_tiles:
# Add sources of cached tiles, to avoid loading same tile multiple times
# loading recursive.
if t.coord in rescaled_tiles:
t.source = rescaled_tiles[t.coord].source
tile_collection = self._load_tile_coords(
affected_tiles,
rescale_till_zoom=stop_zoom,
rescaled_tiles=rescaled_tiles,
)
if tile_collection.blank:
return tile
tile_sources = []
for t in tile_collection:
# Replace RESCALE_TILE_MISSING with None, before transforming tiles.
tile_sources.append(t.source if t.source is not RESCALE_TILE_MISSING else None)
tiled_image = TiledImage(tile_sources, src_bbox=src_bbox, src_srs=self.grid.srs,
tile_grid=src_tile_grid, tile_size=self.grid.tile_size)
tile.source = tiled_image.transform(tile_bbox, self.grid.srs, self.grid.tile_size, self.image_opts)
if self.cache_rescaled_tiles:
self.cache.store_tile(tile)
return tile
class TileManager(object):
"""
Manages tiles for a single grid.
Loads tiles from the cache, creates new tiles from sources and stores them
into the cache, or removes tiles.
:param pre_store_filter: a list with filter. each filter will be called
with a tile before it will be stored to disc. the filter should
return this or a new tile object.
"""
def __init__(
self,
grid,
cache,
sources,
format,
locker,
image_opts=None,
request_format=None,
meta_buffer=None,
meta_size=None,
minimize_meta_requests=False,
identifier=None,
pre_store_filter=None,
concurrent_tile_creators=1,
tile_creator_class=None,
bulk_meta_tiles=False,
):
self.grid = grid
self.cache = cache
self.locker = locker
self.identifier = identifier
self.meta_grid = None
self.format = format
self.image_opts = image_opts
self.request_format = request_format or format
self.sources = sources
self.minimize_meta_requests = minimize_meta_requests
self._expire_timestamp = None
self.transparent = self.sources[0].transparent
self.pre_store_filter = pre_store_filter or []
self.concurrent_tile_creators = concurrent_tile_creators
self.tile_creator_class = tile_creator_class or TileCreator
if meta_buffer or (meta_size and not meta_size == [1, 1]):
if all(source.supports_meta_tiles for source in sources):
self.meta_grid = MetaGrid(grid,
meta_size=meta_size,
meta_buffer=meta_buffer)
elif any(source.supports_meta_tiles for source in sources):
raise ValueError(
'meta tiling configured but not supported by all sources')
elif meta_size and not meta_size == [1, 1] and bulk_meta_tiles:
# meta tiles configured but all sources are tiled
# use bulk_meta_tile mode that download tiles in parallel
self.meta_grid = MetaGrid(grid,
meta_size=meta_size,
meta_buffer=0)
self.tile_creator_class = partial(self.tile_creator_class,
bulk_meta_tiles=True)
@contextmanager
def session(self):
"""
Context manager for access to the cache. Cleans up after usage
for connection based caches.
>>> with tile_manager.session(): #doctest: +SKIP
... tile_manager.load_tile_coords(tile_coords)
"""
yield
self.cleanup()
def cleanup(self):
if hasattr(self.cache, 'cleanup'):
self.cache.cleanup()
def load_tile_coord(self,
tile_coord,
dimensions=None,
with_metadata=False):
tile = Tile(tile_coord)
self.cache.load_tile(tile, with_metadata)
if tile.coord is not None and not self.is_cached(
tile, dimensions=dimensions):
# missing or staled
creator = self.creator(dimensions=dimensions)
created_tiles = creator.create_tiles([tile])
for created_tile in created_tiles:
if created_tile.coord == tile_coord:
return created_tile
return tile
def load_tile_coords(self,
tile_coords,
dimensions=None,
with_metadata=False):
tiles = TileCollection(tile_coords)
uncached_tiles = []
# load all in batch
self.cache.load_tiles(tiles, with_metadata)
for tile in tiles:
if tile.coord is not None and not self.is_cached(
tile, dimensions=dimensions):
# missing or staled
uncached_tiles.append(tile)
if uncached_tiles:
creator = self.creator(dimensions=dimensions)
created_tiles = creator.create_tiles(uncached_tiles)
for created_tile in created_tiles:
if created_tile.coord in tiles:
tiles[created_tile.coord].source = created_tile.source
return tiles
def remove_tile_coords(self, tile_coords, dimensions=None):
tiles = TileCollection(tile_coords)
self.cache.remove_tiles(tiles)
def creator(self, dimensions=None):
return self.tile_creator_class(self, dimensions=dimensions)
def lock(self, tile):
if self.meta_grid:
tile = Tile(self.meta_grid.main_tile(tile.coord))
return self.locker.lock(tile)
def is_cached(self, tile, dimensions=None):
"""
Return True if the tile is cached.
"""
if isinstance(tile, tuple):
tile = Tile(tile)
if tile.coord is None:
return True
cached = self.cache.is_cached(tile)
max_mtime = self.expire_timestamp(tile)
if cached and max_mtime is not None:
self.cache.load_tile_metadata(tile)
stale = tile.timestamp < max_mtime
if stale:
cached = False
return cached
def is_stale(self, tile, dimensions=None):
"""
Return True if tile exists _and_ is expired.
"""
if isinstance(tile, tuple):
tile = Tile(tile)
if self.cache.is_cached(tile):
# tile exists
if not self.is_cached(tile):
# expired
return True
return False
return False
def expire_timestamp(self, tile=None):
"""
Return the timestamp until which a tile should be accepted as up-to-date,
or ``None`` if the tiles should not expire.
:note: Returns _expire_timestamp by default.
"""
return self._expire_timestamp
def apply_tile_filter(self, tile):
"""
Apply all `pre_store_filter` to this tile.
Returns filtered tile.
"""
if tile.stored:
return tile
for img_filter in self.pre_store_filter:
tile = img_filter(tile)
return tile
