Census ETL should use standard ETL form (#474)

* Fixes #473
Census ETL should use standard ETL form

* linter fixes

data/data-pipeline/data_pipeline/application.py

@@ -2,7 +2,6 @@ import click
 
 from .config import settings
 from .etl.runner import etl_runner, score_generate, score_geo
-from .etl.sources.census.etl import download_census_csvs
 from .etl.sources.census.etl_utils import reset_data_directories as census_reset
 from .tile.generate import generate_tiles
 from .utils import (
@@ -59,7 +58,7 @@ def census_data_download():
     census_reset(data_path)
 
     logger.info("Downloading census data")
-    download_census_csvs(data_path)
+    etl_runner("census")
 
     logger.info("Completed downloading census data")
 

data/data-pipeline/data_pipeline/etl/runner.py

@@ -17,6 +17,11 @@ def etl_runner(dataset_to_run: str = None) -> None:
 
     # this list comes from YAMLs
     dataset_list = [
+        {
+            "name": "census",
+            "module_dir": "census",
+            "class_name": "CensusETL",
+        },
         {
             "name": "tree_equity_score",
             "module_dir": "tree_equity_score",

data/data-pipeline/data_pipeline/etl/sources/census/etl.py

@@ -1,10 +1,11 @@
 import csv
 import json
-import os
-from pathlib import Path
 import subprocess
+from enum import Enum
+from pathlib import Path
 
 import geopandas as gpd
+from data_pipeline.etl.base import ExtractTransformLoad
 from data_pipeline.utils import get_module_logger, unzip_file_from_url
 
 from .etl_utils import get_state_fips_codes
@@ -12,48 +13,91 @@ from .etl_utils import get_state_fips_codes
 logger = get_module_logger(__name__)
 
 
-def download_census_csvs(data_path: Path) -> None:
-    """Download all census shape files from the Census FTP and extract the geojson
-    to generate national and by state Census Block Group CSVs and GeoJSONs
+class GeoFileType(Enum):
+    SHP = 1
+    GEOJSON = 2
+    CSV = 3
 
-    Args:
-        data_path (pathlib.Path): Name of the directory where the files and directories will
-        be created
 
-    Returns:
-        None
-    """
+class CensusETL(ExtractTransformLoad):
+    def __init__(self):
+        self.SHP_BASE_PATH = self.DATA_PATH / "census" / "shp"
+        self.GEOJSON_BASE_PATH = self.DATA_PATH / "census" / "geojson"
+        self.CSV_BASE_PATH = self.DATA_PATH / "census" / "csv"
+        # the fips_states_2010.csv is generated from data here
+        # https://www.census.gov/geographies/reference-files/time-series/geo/tallies.html
+        self.STATE_FIPS_CODES = get_state_fips_codes(self.DATA_PATH)
+        self.GEOJSON_PATH = self.DATA_PATH / "census" / "geojson"
+        self.CBG_PER_STATE: dict = {}  # in-memory dict per state
+        self.CBG_NATIONAL: list = []  # in-memory global list
+        self.NATIONAL_CBG_CSV_PATH = self.CSV_BASE_PATH / "us.csv"
+        self.NATIONAL_CBG_JSON_PATH = self.GEOJSON_BASE_PATH / "us.json"
 
-    # the fips_states_2010.csv is generated from data here
-    # https://www.census.gov/geographies/reference-files/time-series/geo/tallies.html
-    state_fips_codes = get_state_fips_codes(data_path)
-    geojson_dir_path = data_path / "census" / "geojson"
+    def _path_for_fips_file(self, fips_code: str, file_type: GeoFileType) -> Path:
+        """Get paths for associated geospatial files for the provided FIPS code
+
+        Args:
+            fips_code (str): the FIPS code for the region of interest
+            file_type (GeoFileType): the geo file type of interest
+
+        Returns:
+            Path on disk to the file_type file corresponding to this FIPS
+        """
+        file_path : Path
+        if file_type == GeoFileType.SHP:
+            file_path = Path(
+                self.SHP_BASE_PATH / fips_code / f"tl_2010_{fips_code}_bg10.shp"
+            )
+        elif file_type == GeoFileType.GEOJSON:
+            file_path = Path(self.GEOJSON_BASE_PATH / f"{fips_code}.json")
+        elif file_type == GeoFileType.CSV:
+            file_path = Path(self.CSV_BASE_PATH / f"{fips_code}.csv")
+        return file_path
+
+    def _extract_shp(self, fips_code: str) -> None:
+        """Download the SHP file for the provided FIPS code
+
+        Args:
+            fips_code (str): the FIPS code for the region of interest
+
+        Returns:
+            None
+        """
+        shp_file_path = self._path_for_fips_file(fips_code, GeoFileType.SHP)
+        logger.info(f"Checking if {fips_code} shp file exists")
 
-    for fips in state_fips_codes:
         # check if file exists
-        shp_file_path: Path = (
-            data_path / "census" / "shp" / fips / f"tl_2010_{fips}_bg10.shp"
-        )
-        geojson_file_path = data_path / "census" / "geojson" / f"{fips}.json"
-
-        logger.info(f"Checking if {fips} shp file exists")
         if not shp_file_path.is_file():
             logger.info(
-                f"{fips} shp file does not exist. Downloading and extracting shape file"
+                f"{fips_code} shp file does not exist. Downloading and extracting shape file"
             )
 
-            # 2020 tiger data is here: https://www2.census.gov/geo/tiger/TIGER2020/BG/
-            # But using 2010 for now
-            cbg_state_url = f"https://www2.census.gov/geo/tiger/TIGER2010/BG/2010/tl_2010_{fips}_bg10.zip"
-            unzip_file_from_url(
-                cbg_state_url,
-                data_path / "tmp",
-                data_path / "census" / "shp" / fips,
-            )
-        logger.info(f"Checking if {fips} geoJSON file exists ")
+        # 2020 tiger data is here: https://www2.census.gov/geo/tiger/TIGER2020/BG/
+        # But using 2010 for now
+        cbg_state_url = f"https://www2.census.gov/geo/tiger/TIGER2010/BG/2010/tl_2010_{fips_code}_bg10.zip"
+        unzip_file_from_url(
+            cbg_state_url,
+            self.TMP_PATH,
+            self.DATA_PATH / "census" / "shp" / fips_code,
+        )
+
+    def extract(self) -> None:
+        logger.info("Downloading Census Data")
+        for fips_code in self.STATE_FIPS_CODES:
+            self._extract_shp(fips_code)
+
+    def _transform_to_geojson(self, fips_code: str) -> None:
+        """Convert the downloaded SHP file for the associated FIPS to geojson
+
+        Returns:
+            None
+        """
+        shp_file_path = self._path_for_fips_file(fips_code, GeoFileType.SHP)
+        geojson_file_path = self._path_for_fips_file(fips_code, GeoFileType.GEOJSON)
+        logger.info(f"Checking if {fips_code} geoJSON file exists ")
         if not geojson_file_path.is_file():
             logger.info(
-                f"GeoJSON file {fips} does not exist. Converting shp to geoJSON"
+                f"GeoJSON file {fips_code} does not exist. Converting shp to geoJSON"
             )
             cmd = [
                 "ogr2ogr",
@@ -64,30 +108,50 @@ def download_census_csvs(data_path: Path) -> None:
             ]
             subprocess.run(cmd, check=True)
 
-    # generate CBG CSV table for pandas
-    ## load in memory
-    cbg_national = []  # in-memory global list
-    cbg_per_state: dict = {}  # in-memory dict per state
-    for file in os.listdir(geojson_dir_path):
-        if file.endswith(".json"):
-            logger.info(f"Ingesting geoid10 for file {file}")
-            with open(geojson_dir_path / file) as f:
-                geojson = json.load(f)
-                for feature in geojson["features"]:
-                    geoid10 = feature["properties"]["GEOID10"]
-                    cbg_national.append(str(geoid10))
-                    geoid10_state_id = geoid10[:2]
-                    if not cbg_per_state.get(geoid10_state_id):
-                        cbg_per_state[geoid10_state_id] = []
-                    cbg_per_state[geoid10_state_id].append(geoid10)
+    def _generate_cbg_table(self) -> None:
+        """Generate CBG CSV table for pandas, load in memory
 
-    csv_dir_path = data_path / "census" / "csv"
-    ## write to individual state csv
-    for state_id in cbg_per_state:
-        geoid10_list = cbg_per_state[state_id]
-        with open(
-            csv_dir_path / f"{state_id}.csv", mode="w", newline=""
-        ) as cbg_csv_file:
+        Returns:
+            None
+        """
+        for file in self.GEOJSON_BASE_PATH.iterdir():
+            if file.suffix == ".json":
+                logger.info(f"Ingesting geoid10 for file {file}")
+                with open(self.GEOJSON_BASE_PATH / file) as f:
+                    geojson = json.load(f)
+                    for feature in geojson["features"]:
+                        geoid10 = feature["properties"]["GEOID10"]
+                        self.CBG_NATIONAL.append(str(geoid10))
+                        geoid10_state_id = geoid10[:2]
+                        if not self.CBG_PER_STATE.get(geoid10_state_id):
+                            self.CBG_PER_STATE[geoid10_state_id] = []
+                        self.CBG_PER_STATE[geoid10_state_id].append(geoid10)
+
+    def transform(self) -> None:
+        """Download all census shape files from the Census FTP and extract the geojson
+        to generate national and by state Census Block Group CSVs and GeoJSONs
+
+        Returns:
+            None
+        """
+        logger.info("Transforming Census Data")
+        for fips_code in self.STATE_FIPS_CODES:
+            self._transform_to_geojson(fips_code)
+        self._generate_cbg_table()
+
+    def _load_into_state_csvs(self, fips_code: str) -> None:
+        """Load state CSVS into individual CSV files
+
+        Args:
+            fips_code (str): the FIPS code for the region of interest
+
+        Returns:
+            None
+        """
+        ## write to individual state csv
+        geoid10_list = self.CBG_PER_STATE[fips_code]
+        csv_path = self._path_for_fips_file(fips_code, GeoFileType.CSV)
+        with open(csv_path, mode="w", newline="") as cbg_csv_file:
             cbg_csv_file_writer = csv.writer(
                 cbg_csv_file,
                 delimiter=",",
@@ -102,33 +166,59 @@ def download_census_csvs(data_path: Path) -> None:
                     ]
                 )
 
-    ## write US csv
-    logger.info("Writing national us.csv file")
-    with open(csv_dir_path / "us.csv", mode="w", newline="") as cbg_csv_file:
-        cbg_csv_file_writer = csv.writer(
-            cbg_csv_file,
-            delimiter=",",
-            quotechar='"',
-            quoting=csv.QUOTE_MINIMAL,
-        )
-        for geoid10 in cbg_national:
-            cbg_csv_file_writer.writerow(
-                [
-                    geoid10,
-                ]
-            )
+    def _load_national_csv(self):
+        """Write national-level csv combining
 
-    ## create national geojson
-    logger.info("Generating national geojson file")
-    usa_df = gpd.GeoDataFrame()
+        Returns:
+            None
+        """
+        logger.info("Writing national us.csv file")
 
-    for file_name in geojson_dir_path.rglob("*.json"):
-        logger.info(f"Ingesting {file_name}")
-        state_gdf = gpd.read_file(file_name)
-        usa_df = usa_df.append(state_gdf)
+        if not self.NATIONAL_CBG_CSV_PATH.is_file():
+            logger.info(f"Creating {self.NATIONAL_CBG_CSV_PATH}")
+            with open(self.NATIONAL_CBG_CSV_PATH, mode="w", newline="") as cbg_csv_file:
+                cbg_csv_file_writer = csv.writer(
+                    cbg_csv_file,
+                    delimiter=",",
+                    quotechar='"',
+                    quoting=csv.QUOTE_MINIMAL,
+                )
+                for geoid10 in self.CBG_NATIONAL:
+                    cbg_csv_file_writer.writerow(
+                        [
+                            geoid10,
+                        ]
+                    )
 
-    usa_df = usa_df.to_crs("+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs")
-    logger.info("Writing national geojson file")
-    usa_df.to_file(geojson_dir_path / "us.json", driver="GeoJSON")
+    def _load_national_geojson(self):
+        """Create national geojson
 
-    logger.info("Census block groups downloading complete")
+        Returns:
+            None
+        """
+        logger.info("Generating national geojson file")
+
+        usa_df = gpd.GeoDataFrame()
+
+        for file_name in self.GEOJSON_BASE_PATH.rglob("*.json"):
+            logger.info(f"Ingesting {file_name}")
+            state_gdf = gpd.read_file(file_name)
+            usa_df = usa_df.append(state_gdf)
+
+        usa_df = usa_df.to_crs("+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs")
+        logger.info("Writing national geojson file")
+        usa_df.to_file(self.NATIONAL_CBG_JSON_PATH, driver="GeoJSON")
+
+        logger.info("Census block groups downloading complete")
+
+    def load(self) -> None:
+        """Create state CSVs, National CSV, and National GeoJSON
+
+        Returns:
+            None
+        """
+        logger.info("Saving Census CSV")
+        for fips_code in self.CBG_PER_STATE:
+            self._load_into_state_csvs(fips_code)
+        self._load_national_csv()
+        self._load_national_geojson()