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import asyncio | ||
from dataclasses import dataclass | ||
from typing import List | ||
from urllib.parse import urlsplit | ||
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import aiohttp | ||
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from .cog import COGReader | ||
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@dataclass | ||
class STACReader: | ||
filepath: str | ||
readers: List[COGReader] = None | ||
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async def __aenter__(self): | ||
splits = urlsplit(self.filepath) | ||
if splits.scheme in {"http", "https"}: | ||
async with aiohttp.ClientSession() as session: | ||
async with session.get(self.filepath) as resp: | ||
resp.raise_for_status() | ||
item = await resp.json() | ||
else: | ||
# TODO: support s3 | ||
pass | ||
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reader_futs = [] | ||
for asset in item["assets"]: | ||
if item["assets"][asset]["type"] == "image/x.geotiff": | ||
reader = COGReader(item["assets"][asset]["href"]).__aenter__() | ||
reader_futs.append(reader) | ||
self.readers = await asyncio.gather(*reader_futs) | ||
return self | ||
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async def __aexit__(self, exc_type, exc_val, exc_tb): | ||
for reader in self.readers: | ||
await reader._file_reader._close() | ||
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async def get_tile(self, x: int, y: int, z: int): | ||
futs = [reader.get_tile(x, y, z) for reader in self.readers] | ||
return await asyncio.gather(*futs) |