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   "cell_type": "markdown",
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   "metadata": {},
   "source": [
    "# earthaccess authentication on a distributed Dask Cluster"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "id": "26a66edc-55e2-4934-84f8-bd19e98883c6",
   "metadata": {},
   "outputs": [
    {
     "name": "stdin",
     "output_type": "stream",
     "text": [
      "Enter your Earthdata Login username:  earthaccess\n",
      "Enter your Earthdata password:  ········\n"
     ]
    },
    {
     "data": {
      "text/plain": [
       "'0.9.0'"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "import earthaccess\n",
    "import xarray as xr\n",
    "import os\n",
    "\n",
    "earthaccess.login()\n",
    "\n",
    "earthaccess.__version__"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 10,
   "id": "a52a678c-0a57-4fae-8b54-9fd7e6870730",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Start cluster if one does not exist.\n",
    "if 'client' not in locals():\n",
    "    import dask\n",
    "    from dask.distributed import Client\n",
    "    from dask import delayed\n",
    "    import dask.array as da\n",
    "    dask.config.set(scheduler='processes')\n",
    "\n",
    "    client = Client(n_workers=2, threads_per_worker=1)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "004c43f0-cb7c-498e-9063-0a1d7b933334",
   "metadata": {},
   "source": [
    "## Auth on a distributed cluster\n",
    "\n",
    "Because processes and distributed workers don't share local variables we need a way to pass them the credentials so each local instance of earthaccess can authenticate and open our granules.\n",
    "\n",
    "This is not optimal and I anticipate that we start embedding the token in the results themselves so earthaccess will grab it from there without us having to manually forward them to the workers."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "id": "a5031341-bc9c-4060-829f-8fb7b5489d9b",
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "{'tcp://127.0.0.1:33247': None, 'tcp://127.0.0.1:34619': None}"
      ]
     },
     "execution_count": 11,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# this gets executed on each worker\n",
    "def auth_env(auth):\n",
    "    os.environ[\"EARTHDATA_USERNAME\"] = auth[\"EARTHDATA_USERNAME\"]\n",
    "    os.environ[\"EARTHDATA_PASSWORD\"] = auth[\"EARTHDATA_PASSWORD\"]\n",
    "    \n",
    "client.run(auth_env, auth=earthaccess.auth_environ())"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "3e965bd9-8b4c-4a4e-b582-e8c6168474b9",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Granules found: 7871\n"
     ]
    }
   ],
   "source": [
    "granule_info = earthaccess.search_data(short_name=\"MUR25-JPL-L4-GLOB-v04.2\", count=10)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "id": "6a07a76a-f706-43d0-983b-e7f246f4b97a",
   "metadata": {},
   "outputs": [],
   "source": [
    "def sstmean_1file(gran_info_single):\n",
    "    earthaccess.login()\n",
    "    fileobj = earthaccess.open([gran_info_single])[0]\n",
    "    data = xr.open_dataset(fileobj)\n",
    "    return data['analysed_sst'].mean().item()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 15,
   "id": "dfc41f38-5fa4-4d32-bca1-252c748c9242",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Process several granules in parallel using Dask:\n",
    "sstmean_1file_parallel = delayed(sstmean_1file)\n",
    "tasks = [sstmean_1file_parallel(gi) for gi in granule_info[:2]]"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "id": "c494c0b3-ae38-4d83-be32-d2ff9815a129",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Opening 1 granules, approx size: 0.0 GB\n",
      "using endpoint: https://archive.podaac.earthdata.nasa.gov/s3credentials\n",
      "Opening 1 granules, approx size: 0.0 GB\n",
      "using endpoint: https://archive.podaac.earthdata.nasa.gov/s3credentials\n"
     ]
    },
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "QUEUEING TASKS | : 100%|██████████| 1/1 [00:00<00:00, 2291.97it/s]\n",
      "QUEUEING TASKS | : 100%|██████████| 1/1 [00:00<00:00, 2340.57it/s]\n",
      "PROCESSING TASKS | :   0%|          | 0/1 [00:00<?, ?it/s]"
     ]
    },
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "(287.01715087890625, 287.0110778808594)\n"
     ]
    },
    {
     "name": "stderr",
     "output_type": "stream",
     "text": [
      "PROCESSING TASKS | : 100%|██████████| 1/1 [00:00<00:00,  4.81it/s]\n",
      "COLLECTING RESULTS | : 100%|██████████| 1/1 [00:00<00:00, 23563.51it/s]\n",
      "PROCESSING TASKS | : 100%|██████████| 1/1 [00:00<00:00,  4.66it/s]\n",
      "COLLECTING RESULTS | : 100%|██████████| 1/1 [00:00<00:00, 24528.09it/s]\n"
     ]
    }
   ],
   "source": [
    "results = da.compute(*tasks)\n",
    "print(results)"
   ]
  }
 ],
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